# Patent

## Title
Amino-substituted imidazo[1,2-a]pyridinecarboxamides and their use

## Abstract

The present application relates to novel substituted imidazo[1,2-a]pyridine-3-carboxamides, to processes for their preparation, to their use alone or in combinations for the treatment and/or prophylaxis of diseases and to their use for preparing medicaments for the treatment and/or prophylaxis of diseases, in particular for the treatment and/or prophylaxis of cardiovascular disorders.

## Background
The present application relates to novel substituted imidazo[1,2-a]pyridine-3-carboxamides, to processes for their preparation, to their use alone or in combinations for the treatment and/or prophylaxis of diseases and to their use for preparing medicaments for the treatment and/or prophylaxis of diseases, in particular for the treatment and/or prophylaxis of cardiovascular disorders.
One of the most important cellular transmission systems in mammalian cells is cyclic guanosine monophosphate (cGMP). Together with nitric oxide (NO), which is released from the endothelium and transmits hormonal and mechanical signals, it forms the NO/cGMP system. Guanylate cyclases catalyse the biosynthesis of cGMP from guanosine triphosphate (GTP). The representatives of this family disclosed to date can be divided both according to structural features and according to the type of ligands into two groups: the particulate guanylate cyclases which can be stimulated by natriuretic peptides, and the soluble guanylate cyclases which can be stimulated by NO. The soluble guanylate cyclases consist of two subunits and very probably contain one haem per heterodimer, which is part of the regulatory site. The latter is of central importance for the mechanism of activation. NO is able to bind to the iron atom of haem and thus markedly increase the activity of the enzyme. Haem-free preparations cannot, by contrast, be stimulated by NO. Carbon monoxide (CO) is also able to attach to the central iron atom of haem, but the stimulation by CO is distinctly less than that by NO.
Through the production of cGMP and the regulation, resulting therefrom, of phosphodiesterases, ion channels and protein kinases, guanylate cyclase plays a crucial part in various physiological processes, in particular in the relaxation and proliferation of smooth muscle cells, in platelet aggregation and adhesion and in neuronal signal transmission, and in disorders caused by an impairment of the aforementioned processes. Under pathophysiological conditions, the NO/cGMP system may be suppressed, which may lead for example to high blood pressure, platelet activation, increased cellular proliferation, endothelial dysfunction, atherosclerosis, angina pectoris, heart failure, myocardial infarction, thromboses, stroke and sexual dysfunction.
A possible way of treating such disorders which is independent of NO and aims at influencing the cGMP signaling pathway in organisms is a promising approach because of the high efficiency and few side effects which are to be expected.
Compounds, such as organic nitrates, whose effect is based on NO have to date been exclusively used for the therapeutic stimulation of soluble guanylate cyclase. NO is produced by bioconversion and activates soluble guanylate cyclase by attaching to the central iron atom of haem. Besides the side effects, the development of tolerance is one of the crucial disadvantages of this mode of treatment.
Over the last years, a number of substances which stimulate soluble guanylate cyclase directly. i.e. without prior release of NO, have been described, for example 3-(5′-hydroxymethyl-2′-furyl)-1-benzylindazole [YC-1; Wu et al., Blood 84 (1994), 4226; Mülsch et al., Brit. J. Pharmacol. 120 (1997), 681], fatty acids [Goldberg et al., J. Biol. Chem. 252 (1977), 1279], diphenyliodonium hexafluorophosphate [Pettibone et al., Eur. J. Pharmacol. 116 (1985), 307], isoliquiritigenin [Yu et al., Brit. J. Pharmacol. 114 (1995), 1587], and also various substituted pyrazole derivatives (WO 98/16223).
EP 0 266 890-A1, WO 89/03833-A1, JP 01258674-A [cf. Chem. Abstr. 112:178986], WO 96/34866-A1, EP 1 277 754-A1, WO 2006/015737-A1, WO 2008/008539-A2, WO 2008/082490-A2, WO 2008/134553-A1, WO 2010/030538-A2 and WO 2011/113606-A1, inter alia, describe various imidazo[1,2-a]pyridine derivatives which can be used for treating disorders.
It was an object of the present invention to provide novel substances which act as stimulators of soluble guanylate cyclase and, as such, are suitable for the treatment and/or prophylaxis of diseases.
The present invention provides compounds of the general formula (I)




in which

    A represents CH2, CD2 or CH(CH3),
    R1 represents (C4-C6)-alkyl, (C3-C7)-cycloalkyl or phenyl,
    
        where (C4-C6)-alkyl may be substituted up to six times by fluorine,
        where (C3-C7)-cycloalkyl may be substituted by 1 to 4 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl and (C1-C4)-alkyl,
        and
        where phenyl may be substituted by 1 to 4 substituents independently of one another selected from the group consisting of halogen, cyano, monofluoromethyl, difluoromethyl, trifluoromethyl, (C1-C4)-alkyl, (C1-C4)-alkoxy, difluoromethoxy and trifluoromethoxy,
    
    
    R2 represents hydrogen, (C1-C4)-alkyl, cyclopropyl, monofluoromethyl, difluoromethyl or trifluoromethyl,
    R3 represents a group of the formula






    
    
        where
        * represents the point of attachment to the carbonyl group,
        L1A represents a bond or (C1-C4)-alkanediyl,
        
            where (C1-C4)-alkanediyl may be substituted by 1 to 3 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, (C1-C4)-alkyl, (C3-C7)-cycloalkyl, hydroxy and (C1-C4)-alkoxy,
        
        
        L1B represents a bond or (C1-C4)-alkanediyl,
        L1C represents a bond or (C1-C4)-alkanediyl,
        
            where (C1-C4)-alkanediyl may be substituted by 1 to 3 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, (C1-C4)-alkyl, (C3-C7)-cycloalkyl, hydroxy and (C1-C4)-alkoxy,
        
        
        R7 represents hydrogen, (C1-C6)-alkyl, (C2-C6)-alkenyl, (C2-C6)-alkynyl, (C3-C7)-cycloalkyl, 5- or 6-membered heteroaryl or phenyl,
        
            where (C1-C6)-alkyl may be substituted by 1 to 3 substituents independently of one trifluoromethyl, difluoromethoxy, trifluoromethoxy, hydroxy, (C1-C4)-alkoxy, (C1-C4)-alkoxycarbonyl, (C1-C4)-alkylsulphonyl, phenyl, phenoxy and benzyloxy,
            
                where phenyl, phenoxy and benzyloxy for their part may be substituted by 1 to 3 halogen substituents,
            
            
            where (C3-C7)-cycloalkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, (C1-C4)-alkyl and (C1-C4)-alkoxy,
            and
            where phenyl and 5- or 6-membered heteroaryl may be substituted by 1 to 3 substituents independently of one another selected from the group consisting of halogen, cyano, trifluoromethyl, (C1-C4)-alkyl, (C1-C4)-alkylsulphonyl and (C1-C4)-alkoxy,
        
        
        R8 represents hydrogen or (C1-C4)-alkyl,
        or
        R7 and R8 together with the carbon atom to which they are attached form a 3- to 7-membered carbocycle or a 4- to 7-membered heterocycle,
        
            where the 3- to 7-membered carbocycle and the 4- to 7-membered heterocycle for their part may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine and (C1-C4)-alkyl,
        
        
        R9 represents hydrogen, (C1-C6)-alkyl, (C2-C6)-alkenyl, (C2-C6)-alkynyl, (C3-C7)-cycloalkyl, 5- or 6-membered heteroaryl or phenyl,
        
            where (C1-C6)-alkyl may be substituted by 1 to 3 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, difluoromethoxy, trifluoromethoxy, hydroxy, (C1-C4)-alkoxy, (C1-C4)-alkoxy-carbonyl, (C1-C4)-alkylsulphonyl, phenyl, phenoxy and benzyloxy,
            
                where phenyl, phenoxy and benzyloxy for their part may be substituted by 1 to 3 halogen substituents,
            
            
            where (C3-C7)-cycloalkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, (C1-C4)-alkyl and (C1-C4)-alkoxy,
            and
            where phenyl and 5- or 6-membered heteroaryl may be substituted by 1 to 3 substituents independently of one another selected from the group consisting of halogen, cyano, trifluoromethyl, (C1-C4)-alkyl, (C1-C4)-alkoxy and (C1-C4)-alkylsulphonyl,
        
        
        R10 represents hydrogen or (C1-C4)-alkyl,
        or
        R9 and R10 together with the carbon atom to which they are attached form a 3- to 7-membered carbocycle or a 4- to 7-membered heterocycle,
        
            where the 3- to 7-membered carbocycle and the 4- to 7-membered heterocycle for their part may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine and (C1-C4)-alkyl,
        
        
        with the proviso that the radicals R7 and R9 do not both represent phenyl,
        or
        R7 and R9 together with the carbon atoms to which they are attached and with the group L1B form a 5- to 7-membered carbocycle or a 4- to 7-membered heterocycle,
        with the proviso that not more than one of the radical pairs R7 and R8, R9 and R10 and R7 and R9, respectively, forms a carbo- or heterocycle,
        R11 represents hydrogen or (C1-C4)-alkyl,
        
            where (C1-C4)-alkyl may be substituted by 1 to 3 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, hydroxy and (C1-C4)-alkoxy,
        
        
        R12 represents hydrogen, (C1-C6)-alkyl, (C3-C7)-cycloalkyl, phenyl or benzyl,
        
            where (C1-C6)-alkyl may be substituted by 1 to 3 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, hydroxy, (C1-C4)-alkoxy and phenoxy,
            and
            where phenyl and benzyl may be substituted by 1 to 3 substituents independently of one another selected from the group consisting of halogen and trifluoromethyl,
        
        
        or
        R11 and R12 together with the nitrogen atom to which they are attached form a 4- to 7-membered azaheterocycle,
        
            where the 4- to 7-membered azaheterocycle may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, (C1-C4)-alkyl, (C3-C7)-cycloalkyl, hydroxy, (C1-C4)-alkoxy and 4- to 7-membered heterocyclyl,
        
        
        and
        L2 represents a bond or (C1-C4)-alkanediyl,
        R13 represents 5- to 9-membered azaheterocyclyl which is attached via a ring carbon atom,
        
            where 5- to 9-membered azaheterocyclyl may be substituted by 1 to 5 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, (C1-C4)-alkyl, (C3-C7)-cycloalkyl and benzyl,
            and
            where 5- to 9-membered azaheterocyclyl may be fused to a phenyl ring which for its part may be substituted by 1 or 2 substituents selected from the group consisting of halogen, (C1-C4)-alkyl and trifluoromethyl,
        
        
    
    
    R4 represents hydrogen,
    R5 represents hydrogen, halogen, cyano, difluoromethyl, trifluoromethyl, (C1-C4)-alkyl, (C3-C7)-cycloalkyl, (C2-C4)-alkynyl, difluoromethoxy, trifluoromethoxy, (C1-C4)-alkoxy, amino, 4- to 7-membered heterocyclyl or 5- or 6-membered heteroaryl,
    R6 represents hydrogen, cyano or halogen,

and their N-oxides, salts, solvates, salts of the N-oxides and solvates of the N-oxides and salts.



Compounds according to the invention are the compounds of the formula (I) and their salts, solvates and solvates of the salts, the compounds included in the formula (I) of the formulae mentioned in the following and their salts, solvates and solvates of the salts, and the compounds included in the formula (I) and mentioned in the following as embodiment examples and their salts, solvates and solvates of the salts, where the compounds included in the formula (I) and mentioned in the following are not already salts, solvates and solvates of the salts.
Preferred salts in the context of the present invention are physiologically acceptable salts of the compounds according to the invention. Salts which are not themselves suitable for pharmaceutical uses but can be used, for example, for isolation or purification of the compounds according to the invention are also included.
Physiologically acceptable salts of the compounds according to the invention include acid addition salts of mineral acids, carboxylic acids and sulphonic acids, e.g. salts of hydrochloric acid, hydrobromic acid, sulphuric acid, phosphoric acid, methanesulphonic acid, ethanesulphonic acid, toluenesulphonic acid, benzenesulphonic acid, naphthalenedisulphonic acid, formic acid, acetic acid, trifluoroacetic acid, propionic acid, lactic acid, tartaric acid, malic acid, citric acid, fumaric acid, maleic acid, and benzoic acid.
Physiologically acceptable salts of the compounds according to the invention also include salts of conventional bases, such as, by way of example and preferably, alkali metal salts (e.g. sodium and potassium salts), alkaline earth metal salts (e.g. calcium and magnesium salts) and ammonium salts derived from ammonia or organic amines having 1 to 16 carbon atoms, such as, by way of example and preferably, ethylamine, diethylamine, triethylamine, ethyldiisopropylamine, monoethanol-amine, diethanolamine, triethanolamine, dicyclohexylamine, dimethylaminoethanol, procaine, dibenzylamine, N-methylmorpholine, arginine, lysine, ethylenediamine and N-methylpiperidine.
Solvates in the context of the invention are designated as those forms of the compounds according to the invention which form a complex in the solid or liquid state by coordination with solvent molecules. Hydrates are a specific form of solvates, in which the coordination takes place with water. Hydrates are preferred solvates in the context of the present invention.
The compounds according to the invention can exist in different stereoisomeric forms depending on their structure, i.e. in the form of configuration isomers or optionally also as conformation isomers (enantiomers and/or diastereomers, including those in the case of atropisomers). The present invention therefore includes the enantiomers and diastereomers and their particular mixtures. The stereoisomerically uniform constituents can be isolated from such mixtures of enantiomers and/or diastereomers in a known manner; chromatography processes are preferably used for this, in particular HPLC chromatography on an achiral or chiral phase.
Where the compounds according to the invention can occur in tautomeric forms, the present invention includes all the tautomeric forms.
The present invention also encompasses all suitable isotopic variants of the compounds according to the invention. An isotopic variant of a compound according to the invention is understood here to mean a compound in which at least one atom within the compound according to the invention has been exchanged for another atom of the same atomic number, but with a different atomic mass than the atomic mass which usually or predominantly occurs in nature. Examples of isotopes which can be incorporated into a compound according to the invention are those of hydrogen, carbon, nitrogen, oxygen, phosphorus, sulphur, fluorine, chlorine, bromine and iodine, such as 2H (deuterium), 3H (tritium), 13C, 14C, 15N, 17O, 18O, 32P, 33P, 33S, 34S, 35S, 36S, 18F, 36Cl, 82Br, 123I, 124I, 129I and 131I. Particular isotopic variants of a compound according to the invention, especially those in which one or more radioactive isotopes have been incorporated, may be beneficial, for example, for the examination of the mechanism of action or of the active compound distribution in the body; due to comparatively easy preparability and detectability, especially compounds labelled with 3H or 14C isotopes are suitable for this purpose. In addition, the incorporation of isotopes, for example of deuterium, can lead to particular therapeutic benefits as a consequence of greater metabolic stability of the compound, for example an extension of the half-life in the body or a reduction in the active dose required; such modifications of the compounds according to the invention may therefore in some cases also constitute a preferred embodiment of the present invention. Isotopic variants of the compounds according to the invention can be prepared by processes known to those skilled in the art, for example by the methods described below and the methods described in the working examples, by using corresponding isotopic modifications of the particular reagents and/or starting compounds therein.
The present invention moreover also includes prodrugs of the compounds according to the invention. The term “prodrugs” here designates compounds which themselves can be biologically active or inactive, but are converted (for example metabolically or hydrolytically) into compounds according to the invention during their dwell time in the body.
In the context of the present invention, the substituents have the following meaning, unless specified otherwise:
Alkyl in the context of the invention represents a straight-chain or branched alkyl radical having the number of carbon atoms stated in each case. The following may be mentioned by way of example and by way of preference: methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, 1-methylpropyl, tert-butyl, n-pentyl, isopentyl, 1-ethylpropyl, 1-methylbutyl, 2-methylbutyl, 3-methylbutyl, n-hexyl, 1-methylpentyl, 2-methylpentyl, 3-methylpentyl, 4-methylpentyl, 3,3-dimethylbutyl, 1-ethylbutyl, 2-ethylbutyl.

Cycloalkyl or carbocycle in the context of the invention represents a monocyclic saturated alkyl radical having the number of ring carbon atoms stated in each case. The following may be mentioned by way of example and by way of preference: cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl and cycloheptyl.

Alkenyl in the context of the invention represents a straight-chain or branched alkenyl radical having 2 to 6 carbon atoms and one or two double bonds. Preference is given to a straight-chain or branched alkenyl radical having 2 to 4 carbon atoms and one double bond. The following may be mentioned by way of example and by way of preference: vinyl, allyl, isopropenyl and n-but-2-en-1-yl.

Alkynyl in the context of the invention represents a straight-chain or branched alkynyl radical having 2 to 6 carbon atoms and one triple bond. The following may be mentioned by way of example and by way of preference: ethynyl, n-prop-1-yn-1-yl, n-prop-2-yn-1-yl, n-but-2-yn-1-yl and n-but-3-yn-1-yl.

Alkanediyl in the context of the invention represents a straight-chain or branched divalent alkyl radical having 1 to 4 carbon atoms. The following may be mentioned by way of example and by way of preference: methylene, 1,2-ethylene, ethane-1,1-diyl, 1,3-propylene, propane-1,1-diyl, propane-1,2-diyl, propane-2,2-diyl, 1,4-butylene, butane-1,2-diyl, butane-1,3-diyl and butane-2,3-diyl.

Alkoxy in the context of the invention represents a straight-chain or branched alkoxy radical having 1 to 4 carbon atoms. The following may be mentioned by way of example and by way of preference: methoxy, ethoxy, n-propoxy, isopropoxy, 1-methylpropoxy, n-butoxy, isobutoxy and tert-butoxy.

Alkoxycarbonyl in the context of the invention represents a straight-chain or branched alkoxy radical having 1 to 4 carbon atoms and a carbonyl group attached at the oxygen atom. The following may be mentioned by way of example and by way of preference: methoxycarbonyl, ethoxycarbonyl, n-propoxycarbonyl, isopropoxycarbonyl and tert-butoxycarbonyl.

Alkylsulphonyl in the context of the invention represents a straight-chain or branched alkyl radical which has 1 to 4 carbon atoms and is attached via a sulphonyl group. The following may be mentioned by way of example and by way of preference: methylsulphonyl, ethylsulphonyl, n-propylsulphonyl, isopropylsulphonyl, n-butylsulphonyl and tert-butylsulphonyl.

A 4- to 7-membered heterocycle in the context of the invention represents a monocyclic saturated heterocycle which has a total of 4 to 7 ring atoms, which contains one or two ring heteroatoms from the group consisting of N, O, S, SO and SO2 and which is attached via a ring carbon atom or, if appropriate, a ring nitrogen atom. The following may be mentioned by way of example: azetidinyl, oxetanyl, pyrrolidinyl, pyrazolidinyl, tetrahydrofuranyl, thiolanyl, piperidinyl, piperazinyl, tetrahydropyranyl, tetrahydrothiopyranyl, morpholinyl, thiomorpholinyl, hexahydroazepinyl and hexahydro-1,4-diazepinyl. Preference is given to azetidinyl, oxetanyl, pyrrolidinyl, tetrahydrofuranyl, piperidinyl, piperazinyl, tetrahydropyranyl and morpholinyl.

A 4- to 7-membered azaheterocycle in the context of the invention represents a monocyclic saturated heterocycle which has a total of 4 to 7 ring atoms, which contains one nitrogen atom and which may additionally contain a further ring heteroatom from the group consisting of N, O, S, SO and SO2 and is attached via a ring nitrogen atom. The following may be mentioned by way of example: azetidinyl, pyrrolidinyl, pyrazolidinyl, piperidinyl, piperazinyl, morpholinyl, thiomorpholinyl, 1,1-dioxothiomorpholinyl, hexahydroazepinyl and hexahydro-1,4-diazepinyl.

5- to 9-membered azaheterocyclyl in the context of the invention represents a monocyclic or bicyclic saturated or partially unsaturated heterocycle which has a total of 5 to 9 ring atoms, which contains a nitrogen atom and which may additionally contain one or two further ring heteroatoms from the group consisting of N, O, S, SO and SO2 and is attached via a ring carbon atom. The following may be mentioned by way of example: pyrrolidinyl, pyrazolidinyl, piperidinyl, piperazinyl, morpholinyl, thiomorpholinyl, 1,1-dioxothiomorpholinyl, hexahydroazepinyl, hexahydro-1,4-diazepinyl, 1,2,3,4-tetrahydroisoquinolinyl, 1,2,3,4-tetrahydroquinolinyl, indolinyl, 8-azabicyclo[3.2.1]octanyl, 9-azabicyclo[3.3.1]nonanyl, 3-azabicyclo[4.1.0]heptanyl and quinuclidinyl.

Heteroaryl in the context of the invention represents a monocyclic aromatic heterocycle (heteroaromatic) which has a total of 5 or 6 ring atoms, which contains up to three identical or different ring heteroatoms from the group consisting of N, O and S and is attached via a ring carbon atom or, if appropriate, a ring nitrogen atom. The following may be mentioned by way of example and by way of preference: furyl, pyrrolyl, thienyl, pyrazolyl, imidazolyl, thiazolyl, oxazolyl, isoxazolyl, isothiazolyl, triazolyl, oxadiazolyl, thiadiazolyl, pyridyl, pyrimidinyl, pyridazinyl, pyrazinyl and triazinyl.

Halogen in the context of the invention includes fluorine, chlorine, bromine and iodine. Preference is given to chlorine or fluorine.

In the formula of the group which may represent R3 or R1, the end point of the line marked by a * or # label does not represent a carbon atom or a CH2 group but forms part of the bond to the atom which is designated in each case and to which R3 and R1, respectively, are attached.
If radicals in the compounds according to the invention are substituted, the radicals may, unless specified otherwise, be mono- or polysubstituted. In the context of the present invention, all radicals which occur more than once are defined independently of one another. Substitution by one, two or three identical or different substituents is preferred.
In the context of the present invention, the term “treatment” or “treat” includes the inhibition, delay, arrest, amelioration, attenuation, limitation, reduction, suppression, reversal or cure of a disease, a condition, a disorder, an injury and a health impairment, of the development, course or the progression of such states and/or the symptoms of such states. Here, the term “therapy” is understood to be synonymous with the term “treatment”.
In the context of the present invention, the terms “prevention”, “prophylaxis” or “precaution” are used synonymously and refer to the avoidance or reduction of the risk to get, to contract, to suffer from or to have a disease, a condition, a disorder, an injury or a health impairment, a development or a progression of such states and/or the symptoms of such states.
The treatment or the prevention of a disease, a condition, a disorder, an injury or a health impairment may take place partially or completely.
In the context of the present invention, preference is given to compounds of the formula (I) in which

    A represents CH2, CD2 or CH(CH3),
    R1 represents (C4-C6)-alkyl, (C4-C6)-cycloalkyl or phenyl,
    
        where (C4-C6)-alkyl may be substituted up to six times by fluorine,
        where (C4-C6)-cycloalkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl and methyl,
        and
        where phenyl may be substituted by 1 to 4 substituents independently of one another selected from the group consisting of fluorine, chlorine, cyano, methoxy, difluoromethyl, trifluoromethyl and methyl,
    
    
    R2 represents hydrogen, trifluoromethyl, (C1-C4)-alkyl or cyclopropyl,
    R3 represents a group of the formula






    
    
        where
        * represents the point of attachment to the carbonyl group,
        L1A represents a bond,
        L1B represents a bond, methylene or 1,2-ethanediyl,
        L1C represents a bond or methylene,
        
            where methylene may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of trifluoromethyl, (C1-C4)-alkyl, cyclopropyl and cyclobutyl,
        
        
        R7 represents hydrogen, trifluoromethyl, (C1-C6)-alkyl, (C3-C6)-cycloalkyl, 5- or 6-membered heteroaryl or phenyl,
        
            where (C1-C6)-alkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, difluoromethoxy, trifluoromethoxy, hydroxy, (C1-C4)-alkoxy, phenyl, phenoxy and benzyloxy,
            
                where phenyl, phenoxy and benzyloxy for their part may be substituted by 1 or 2 substituents selected from the group consisting of fluorine and chlorine,
            
            
            where (C3-C6)-cycloalkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, methyl and ethyl,
            and
            where phenyl and 5- or 6-membered heteroaryl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, chlorine, cyano, methyl and trifluoromethyl,
            R8 represents hydrogen, methyl or ethyl,
        
        
        or
        R7 and R8 together with the carbon atom to which they are attached form a 3- to 6-membered carbocycle or an oxetanyl, tetrahydrofuranyl, tetrahydropyranyl, azetidinyl, pyrrolidinyl or piperidinyl ring,
        
            where the 3- to 6-membered carbocycle and the oxetanyl, tetrahydrofuranyl, tetrahydropyranyl, azetidinyl, pyrrolidinyl or piperidinyl ring may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine and methyl,
        
        
        R9 represents hydrogen, 1,1,2,2-tetrafluoroethyl, trifluoromethyl, (C1-C6)-alkyl, (C3-C6)-cycloalkyl, 5- or 6-membered heteroaryl or phenyl,
        
            where (C1-C6)-alkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, difluoromethoxy, trifluoromethoxy, hydroxy, (C1-C4)-alkoxy, phenyl, phenoxy and benzyloxy,
            
                where phenyl, phenoxy and benzyloxy for their part may be substituted by 1 or 2 substituents selected from the group consisting of fluorine and chlorine,
            
            
            where (C3-C6)-cycloalkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, methyl and ethyl,
            and
            where phenyl and 5- or 6-membered heteroaryl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, chlorine, cyano, methyl and trifluoromethyl,
        
        
        R10 represents hydrogen, methyl or ethyl,
        or
        R9 and R10 together with the carbon atom to which they are attached form a 3- to 6-membered carbocycle or an oxetanyl, tetrahydrofuranyl, tetrahydropyranyl, azetidinyl, pyrrolidinyl or piperidinyl ring,
        
            where the 3- to 6-membered carbocycle and the oxetanyl, tetrahydrofuranyl, tetrahydropyranyl, azetidinyl, pyrrolidinyl or piperidinyl ring may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine and methyl,
        
        
        with the proviso that the radicals R7 and R9 do not both represent phenyl,
        or
        R7 and R9 together with the carbon atoms to which they are attached and with the group L1B form a cyclopentyl, cyclohexyl, azetidinyl, oxetanyl, pyrrolidinyl, tetrahydrofuranyl, piperidinyl or tetrahydropyranyl ring,
        with the proviso that not more than one of the radical pairs R7 and R8, R9 and R10 and R7 and R9, respectively, forms one of the carbo- or heterocycles mentioned above,
        R11 represents hydrogen or (C1-C3)-alkyl,
        
            where (C1-C3)-alkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, hydroxy, methoxy and ethoxy,
        
        
        R12 represents hydrogen, (C1-C4)-alkyl, cyclopropyl, cyclobutyl, phenyl or benzyl,
        
            where (C1-C4)-alkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, hydroxy, (C1-C4)-alkoxy and phenoxy,
            and
            where phenyl and benzyl may be substituted by 1 to 3 substituents independently of one another selected from the group consisting of fluorine, chlorine and trifluoromethyl,
        
        
        or
        R11 and R12 together with the nitrogen atom to which they are attached form an azetidinyl, pyrrolidinyl, piperidinyl, morpholinyl, piperazinyl, thiomorpholinyl or 1,1-dioxothiomorpholinyl ring,
        
            where the azetidinyl, pyrrolidinyl, piperidinyl, morpholinyl, piperazinyl, thiomorpholinyl and 1,1-dioxothiomorpholinyl ring may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, methyl, ethyl, cyclopropyl, cyclobutyl, azetidinyl, pyrrolidinyl and piperidinyl,
        
        
        and
        L2 represents a bond, methylene or 1,1-ethanediyl,
        R13 represents pyrrolidinyl, piperidinyl, 1,2,3,4-tetrahydroisoquinolinyl, 1,2,3,4-tetrahydroquinolinyl, indolinyl, 8-azabicyclo[3.2.1]octanyl, 9-azabicyclo[3.3.1]nonanyl, 3-azabicyclo-[4.1.0]heptanyl and quinuclidinyl attached via a ring carbon atom,
        
            where pyrrolidinyl, piperidinyl, 1,2,3,4-tetrahydroisoquinolinyl, 1,2,3,4-tetrahydroquinolinyl, indolinyl, 8-azabicyclo[3.2.1]octanyl, 9-azabicyclo[3.3.1]nonanyl, 3-azabicyclo[4.1.0]heptanyl and quinuclidinyl may be substituted by 1 to 5 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, methyl, ethyl, cyclopropyl, cyclobutyl and benzyl,
        
        
    
    
    R4 represents hydrogen,
    R5 represents hydrogen, fluorine, chlorine, bromine, cyano, methyl, ethyl or cyclopropyl,
    R6 represents hydrogen or fluorine,

and to N-oxides, salts, solvates, salts of the N-oxides and solvates of the N-oxides and salts thereof.



In the context of the present invention, preference is given to compounds of the formula (I) in which

    A represents CH2,
    R1 represents (C4-C6)-alkyl, (C4-C6)-cycloalkyl or phenyl,
    
        where (C4-C6)-alkyl may be substituted up to six times by fluorine,
        where (C4-C6)-cycloalkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl and methyl,
        and
        where phenyl may be substituted by 1 to 4 substituents independently of one another selected from the group consisting of fluorine, chlorine, difluoromethyl, trifluoromethyl and methyl,
    
    
    R2 represents (C1-C3)-alkyl, trifluoromethyl or cyclopropyl,
    R3 represents a group of the formula






    
    
         where
        * represents the point of attachment to the carbonyl group,
        L1A represents a bond,
        L1B represents a bond or methylene,
        L1C represents a bond or methylene,
        
            where methylene may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of trifluoromethyl, (C1-C4)-alkyl, cyclopropyl and cyclobutyl,
        
        
        R7 represents hydrogen, trifluoromethyl, (C1-C6)-alkyl, (C3-C6)-cycloalkyl or phenyl,
        
            where (C1-C6)-alkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, hydroxy, (C1-C4)-alkoxy, phenyl, phenoxy and benzyloxy,
            
                where phenyl, phenoxy and benzyloxy for their part may be substituted by 1 or 2 substituents selected from the group consisting of fluorine and chlorine,
            
            
            where (C3-C6)-cycloalkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, methyl and ethyl,
            and
            where phenyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, chlorine, cyano and trifluoromethyl,
        
        
        R8 represents hydrogen, methyl or ethyl,
        or
        R7 and R8 together with the carbon atom to which they are attached form a 3- to 6-membered carbocycle or an oxetanyl, tetrahydrofuranyl, tetrahydropyranyl, azetidinyl, pyrrolidinyl or piperidinyl ring,
        
            where the 3- to 6-membered carbocycle and the oxetanyl, tetrahydrofuranyl, tetrahydropyranyl, azetidinyl, pyrrolidinyl or piperidinyl ring may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine and methyl,
        
        
        R9 represents hydrogen, trifluoromethyl, (C1-C6)-alkyl, (C3-C6)-cycloalkyl or phenyl,
        
            where (C1-C6)-alkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, hydroxy, (C1-C4)-alkoxy, phenyl, phenoxy and benzyloxy,
            
                where phenyl, phenoxy and benzyloxy for their part may be substituted by 1 or 2 substituents selected from the group consisting of fluorine and chlorine,
            
            
            where (C3-C6)-cycloalkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, methyl and ethyl,
            and
            where phenyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, chlorine, cyano and trifluoromethyl,
        
        
        R10 represents hydrogen, methyl or ethyl,
        or
        R9 and R10 together with the carbon atom to which they are attached form a 3- to 6-membered carbocycle or an oxetanyl, tetrahydrofuranyl, tetrahydropyranyl, azetidinyl, pyrrolidinyl or piperidinyl ring,
        
            where the 3- to 6-membered carbocycle and the oxetanyl, tetrahydrofuranyl, tetrahydropyranyl, azetidinyl, pyrrolidinyl or piperidinyl ring may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine and methyl,
        
        
        with the proviso that the radicals R7 and R9 do not both represent phenyl,
        or
        R7 and R9 together with the carbon atoms to which they are attached and with the group L1B form a cyclopentyl, cyclohexyl, azetidinyl, oxetanyl, pyrrolidinyl, tetrahydrofuranyl, piperidinyl or tetrahydropyranyl ring,
        with the proviso that not more than one of the radical pairs R7 and R8, R9 and R10 and R7 and R9, respectively, forms one of the carbo- or heterocycles mentioned above,
        R11 represents hydrogen or (C1-C3)-alkyl,
        
            where (C1-C3)-alkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine and trifluoromethyl,
        
        
        R12 represents hydrogen, (C1-C4)-alkyl, cyclopropyl or cyclobutyl,
        
            where (C1-C4)-alkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine and trifluoromethyl,
        
        
        or
        R11 and R12 together with the nitrogen atom to which they are attached form an azetidinyl, pyrrolidinyl, piperidinyl or morpholinyl ring,
        
            where the azetidinyl, pyrrolidinyl, piperidinyl and morpholinyl ring may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, methyl, ethyl, cyclopropyl and cyclobutyl,
        
        
        and
        L2 represents a bond or methylene,
        R13 represents pyrrolidinyl, piperidinyl, 1,2,3,4-tetrahydroisoquinolinyl, 1,2,3,4-tetrahydroquinolinyl, indolinyl, 8-azabicyclo[3.2.1]octanyl, 9-azabicyclo[3.3.1]nonanyl, 3-aza-bicyclo[4.1.0]heptanyl and quinuclidinyl attached via a ring carbon atom,
        
            or
            where pyrrolidinyl, piperidinyl, 1,2,3,4-tetrahydroisoquinolinyl, 1,2,3,4-tetrahydroquinolinyl, 8-azabicyclo[3.2.1]octanyl, 9-azabicyclo-[3.3.1]nonanyl, 3-azabicyclo[4.1.0]heptanyl and quinuclidinyl may be substituted by 1 to 5 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, methyl, ethyl, cyclopropyl, cyclobutyl and benzyl,
        
        
    
    
    R4 represents hydrogen,
    R5 represents hydrogen, fluorine, chlorine, methyl, ethyl or cyclopropyl,
    R6 represents hydrogen,

and to N-oxides, salts, solvates, salts of the N-oxides and solvates of the N-oxides and salts thereof.



In the context of the present invention, particular preference is given to compounds of the formula (I) in which

    A represents CH2,
    R1 represents a phenyl group of the formula






    
    
        where
        # represents the point of attachment to A,
        and
        R14, R15 and R16 independently of one another represent hydrogen, fluorine or
        with the proviso that at least two of the radicals R14, R15, R16 are different from hydrogen,
    
    
    R2 represents methyl,
    R3 represents a group of the formula






    
    
        where
        * represents the point of attachment to the carbonyl group,
        L1A represents a bond,
        L1B represents a bond,
        L1C represents a bond,
        R7 represents hydrogen, trifluoromethyl, (C1-C6)-alkyl, (C3-C6)-cycloalkyl or phenyl,
        
            where (C1-C6)-alkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, hydroxy, (C1-C4)-alkoxy and phenyl,
            and
            where phenyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine and chlorine,
        
        
        R8 represents hydrogen, methyl or ethyl,
        R9 represents hydrogen, trifluoromethyl, (C1-C6)-alkyl, cyclopropyl or phenyl,
        
            where (C1-C6)-alkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, hydroxy, (C1-C4)-alkoxy and phenyl,
            and
            where phenyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine and chlorine,
        
        
        R10 represents hydrogen, methyl or ethyl,
        or
        R9 and R10 together with the carbon atom to which they are attached form a 3- to 6-membered carbocycle or an oxetanyl ring,
        with the proviso that the radicals R7 and R9 do not both represent phenyl,
        or
        R7 and R9 together with the carbon atoms to which they are attached and the group L1B form a cyclopentyl or cyclohexyl ring,
        with the proviso that not more than one of the radical pairs R9 and R10 and R7 and R9, respectively, forms one of the carbo- or heterocycles mentioned above,
        R11 represents hydrogen,
        R12 represents hydrogen,
        and
        L2 represents a bond,
        R13 represents piperidin-2-yl, piperidin-3-yl, piperidin-4-yl or 1,2,3,4-tetrahydroquinolin-4-yl,
        
            where piperidin-2-yl, piperidin-3-yl and piperidin-4-yl may be substituted by 1 to 5 substituents independently of one another selected from trifluoromethyl and methyl,
            and
            where 1,2,3,4-tetrahydroquinolin-4-yl may be substituted by fluorine or trifluoromethyl,
        
        
    
    
    R4 represents hydrogen,
    R5 represents hydrogen, fluorine, chlorine or methyl,
    R6 represents hydrogen,

and to N-oxides, salts, solvates, salts of the N-oxides and solvates of the N-oxides and salts thereof.



In the context of the present invention, preference is also given to compounds of the formula (I) in which

    R1 represents a phenyl group of the formula






    
    
        where
        # represents the point of attachment to A,
        and
        R14, R15 and R16 independently of one another represent hydrogen, fluorine or chlorine,
        with the proviso that at least two of the radicals R14, R15, R16 are different from hydrogen, and to N-oxides, salts, solvates, salts of the N-oxides and solvates of the N-oxides and salts thereof. In the context of the present invention, preference is also given to compounds of the formula (I) in which
    
    
    R2 represents methyl,

and to N-oxides, salts, solvates, salts of the N-oxides and solvates of the N-oxides and salts thereof.



In the context of the present invention, preference is also given to compounds of the formula (I) in which

    R3 represents a group of the formula






where

    
    
        * represents the point of attachment to the carbonyl group,
        L1A represents a bond,
        L1B represents a bond or methylene,
        L1C represents a bond or methylene,
        
            where methylene may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of trifluoromethyl, (C1-C4)-alkyl, cyclopropyl and cyclobutyl,

and to N-oxides, salts, solvates, salts of the N-oxides and solvates of the N-oxides and salts thereof.

        
        
    
    


In the context of the present invention, preference is also given to compounds of the formula (I) in which

    R3 represents a group of the formula






    
    
        where
        * represents the point of attachment to the carbonyl group,
        R8 represents hydrogen,

and to N-oxides, salts, solvates, salts of the N-oxides and solvates of the N-oxides and salts thereof.

    
    


In the context of the present invention, preference is also given to compounds of the formula (I) in which

    R3 represents a group of the formula






    
    
        where
        * represents the point of attachment to the carbonyl group,
        and
        R10 represents hydrogen or methyl,

and to N-oxides, salts, solvates, salts of the N-oxides and solvates of the N-oxides and salts thereof.

    
    


In the context of the present invention, preference is also given to compounds of the formula (I) in which

    R5 represents hydrogen, fluorine, chlorine or methyl,

and to N-oxides, salts, solvates, salts of the N-oxides and solvates of the N-oxides and salts thereof.



In the context of the present invention, preference is also given to compounds of the formula (I) in which

    R6 represents hydrogen,

and to N-oxides, salts, solvates, salts of the N-oxides and solvates of the N-oxides and salts thereof.



The definitions of radicals indicated specifically in the respective combinations or preferred combinations of radicals are replaced as desired irrespective of the particular combinations indicated for the radicals also by definitions of radicals of other combinations.
Combinations of two or more of the preferred ranges mentioned above are particularly preferred.
The invention furthermore provides a process for preparing the compounds of the formula (I) according to the invention, characterized in that
[A] a compound of the formula (II)




in which A, R1, R2, R4, R5 and R6 each have the meanings given above and

    T1 represents (C1-C4)-alkyl or benzyl,

is reacted in an inert solvent in the presence of a suitable base or acid to give a carboxylic acid of the formula (III)







in which A, R1, R2, R4, R5 and R6 each have the meanings given above,

and this is subsequently reacted in an inert solvent under amide coupling conditions with an amine of the formula (IV-A) or (IV-B)





in which L1A, L1B, L1C, L2, R7, R8, R9, and R10 each have the meanings given above

and

R11A, R12A and R13A have the meanings given above for R11, R12 and R13, respectively, or represent an amino protective group, for example tert-butoxycarbonyl, benzyloxycarbonyl or benzyl,

or

[B] a compound of the formula (III-B)





in which R2, R4, R5 and R6 each have the meanings given above,

is reacted in an inert solvent under amide coupling conditions with an amine of the formula (IV) to give a compound of the formula (I-A) and (I-B),





in which R2, R4, R5, R6, L1A, L1B, L1C, L2, R7, R8, R9, R10, R11A, R12A and R13A each have the meanings given above,

from this compound, the benzyl group is subsequently removed using methods known to the person skilled in the art and the resulting compound of the formula (V-A) or (V-B)





in which R2, R4, R5, R6, L1A, L1B, L1C, L2, R7, R8, R9, R10, R11A, R12A and R13A each have the meanings given above,

is reacted in an inert solvent in the presence of a suitable base with a compound of the formula (VI)





in which A and R1 have the meanings given above and

    X1 represents a suitable leaving group, in particular chlorine, bromine, iodine, mesylate, triflate or tosylate,

any protective groups present are subsequently removed, and the resulting compounds of the formula (I) are optionally converted with the appropriate (i) solvents and/or (ii) acids or bases into their solvates, salts and/or solvates of the salts.



The compounds of the formulae (I-A) and (I-B) form a subset of the compounds of the formula (I) according to the invention.
The preparation processes described can be illustrated in an exemplary manner by the synthesis schemes below (Schemes 1 and 2):








The compounds of the formulae (IV-A), (IV-B) and (VI) are commercially available, known from the literature or can be prepared analogously to processes known from the literature.
Inert solvents for the process steps (III)+(IV)→(I) and (III-B)+(IV)→(I-B) are, for example, ethers such as diethyl ether, dioxane, tetrahydrofuran, glycol dimethyl ether or diethylene glycol dimethyl ether, hydrocarbons such as benzene, toluene, xylene, hexane, cyclohexane or mineral oil fractions, halogenated hydrocarbons such as dichloromethane, trichloromethane, carbon tetrachloride, 1,2-dichloroethane, trichloroethylene or chlorobenzene, or other solvents such as acetone, ethyl acetate, acetonitrile, pyridine, dimethyl sulphoxide, N,N-dimethylformamide, N,N-dimethylacetamide, N,N′-dimethylpropyleneurea (DMPU) or N-methylpyrrolidone (NMP). It is also possible to use mixtures of the solvents mentioned. Preference is given to dichloromethane, tetrahydrofuran, dimethylformamide or mixtures of these solvents.
Suitable condensing agents for the amide formation in process steps (III)+(IV)→(I) and (III-B)+(IV)→(I-B) are, for example, carbodiimides such as N,N′-diethyl-, N,N′-dipropyl-, N,N′-diisopropyl-, N,N′-dicyclohexylcarbodiimide (DCC) or N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (EDC), phosgene derivatives such as N,N′-carbonyldiimidazole (CDI), 1,2-oxazolium compounds such as 2-ethyl-5-phenyl-1,2-oxazolium 3-sulphate or 2-tert-butyl-5-methylisoxazolium perchlorate, acylamino compounds such as 2-ethoxy-1-ethoxycarbonyl-1,2-dihydroquinoline, or isobutyl chloroformate, propanephosphonic anhydride (T3P), 1-chloro-N,N,2-trimethylpropl-ene-1-amine, diethyl cyanophosphonate, bis-(2-oxo-3-oxazolidinyl)phosphoryl chloride, benzotriazol-1-yloxytris(dimethylamino)phosphonium hexafluorophosphate, benzotriazol-1-yloxytris(pyrrolidino)phosphonium hexafluorophosphate (PyBOP), O-(benzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium tetrafluoroborate (TBTU), O-(benzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate (HBTU), 2-(2-oxo-1-(2H)-pyridyl)-1,1,3,3-tetramethyluronium tetrafluoroborate (TPTU), O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate (HATU) or O-(1H-6-chlorobenzotriazol-1-yl)-1,1,3,3-tetramethyluronium tetrafluoroborate (TCTU), if appropriate in combination with further auxiliaries such as 1-hydroxy-benzotriazole (HOBt) or N-hydroxysuccinimide (HOSu), and also as bases alkali metal carbonates, for example sodium carbonate or potassium carbonate or sodium bicarbonate or potassium bicarbonate, or organic bases such as trialkylamines, for example triethylamine, N-methylmorpholine, N-methylpiperidine or N,N-diisopropylethylamine. Preference is given to using TBTU in combination with N-methylmorpholine, HATU in combination with N,N-diisopropylethylamine or 1-chloro-N,N,2-trimethylprop-1-ene-1amine.
The condensations (III)+(IV)→(I) and (III-B)+(IV)→(I-B) are generally carried out in a temperature range of from −20° C. to +100° C., preferably at from 0° C. to +60° C. The reaction can be performed at atmospheric, elevated or at reduced pressure (for example from 0.5 to 5 bar). In general, the reaction is carried out at atmospheric pressure.
Alternatively, the carboxylic acids of the formula (III) can also initially be converted into the corresponding carbonyl chloride and this can then be reacted directly or in a separate reaction with an amine of the formula (IV) to give the compounds according to the invention. The formation of carbonyl chlorides from carboxylic acids is carried out by methods known to the person skilled in the art, for example by treatment with thionyl chloride, sulphuryl chloride or oxalyl chloride in the presence of a suitable base, for example in the presence of pyridine, and also optionally with addition of dimethylformamide, optionally in a suitable inert solvent.
The hydrolysis of the ester group T1 of the compounds of the formula (II) is carried out by customary methods by treating the esters in inert solvents with acids or bases, where in the latter case the salts initially formed are converted into the free carboxylic acids by treatment with acid. In the case of the tert-butyl esters the ester cleavage is preferably carried out with acids. In the case of benzyl esters, the ester cleavage is preferably carried out hydrogenolytically using palladium on activated carbon or Raney nickel. Suitable inert solvents for this reaction are water or the organic solvents customary for an ester cleavage. These preferably include alcohols such as methanol, ethanol, n-propanol, isopropanol, n-butanol or tert-butanol, or ethers such as diethyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, dioxane or glycol dimethyl ether, or other solvents such as acetone, dichloromethane, dimethylformamide or dimethyl sulphoxide. It is also possible to use mixtures of the solvents mentioned. In the case of a basic ester hydrolysis, preference is given to using mixtures of water with dioxane, tetrahydrofuran, methanol and/or ethanol.
Suitable bases for the ester hydrolysis are the customary inorganic bases. These preferably include alkali metal or alkaline earth metal hydroxides, for example sodium hydroxide, lithium hydroxide, potassium hydroxide or barium hydroxide, or alkali metal or alkaline earth metal carbonates such as sodium carbonate, potassium carbonate or calcium carbonate. Particular preference is given to sodium hydroxide or lithium hydroxide.
Suitable acids for the ester cleavage are, in general, sulphuric acid, hydrogen chloride/hydrochloric acid, hydrogen bromide/hydrobromic acid, phosphoric acid, acetic acid, trifluoroacetic acid, toluenesulphonic acid, methanesulphonic acid or trifluoromethanesulphonic acid, or mixtures thereof, if appropriate with addition of water. Preference is given to hydrogen chloride or trifluoroacetic acid in the case of the tert-butyl esters and hydrochloric acid in the case of the methyl esters.
The ester cleavage is generally carried out in a temperature range of from 0° C. to +100° C., preferably at from +0° C. to +50° C.
The reactions mentioned can be carried out at atmospheric, elevated or reduced pressure (for example from 0.5 to 5 bar). In general, the reactions are in each case carried out at atmospheric pressure.
Inert solvents for the process step (V)+(VI)→(I) are, for example, halogenated hydrocarbons such as dichloromethane, trichloromethane, carbon tetrachloride, trichloroethylene or chlorobenzene, ethers such as diethyl ether, dioxane, tetrahydrofuran, glycol dimethyl ether or diethylene glycol dimethyl ether, hydrocarbons such as benzene, toluene, xylene, hexane, cyclohexane or mineral oil fractions, or other solvents such as acetone, methyl ethyl ketone, ethyl acetate, acetonitrile, N,N-dimethylformamide, N,N-dimethylacetamide, dimethyl sulphoxide, N,N′-dimethylpropyleneurea (DMPU), N-methylpyrrolidone (NMP) or pyridine. It is also possible to use mixtures of the solvents mentioned. Preference is given to using dimethylformamide or dimethyl sulphoxide.
Suitable bases for the process step (V)+(VI)→(I) are the customary inorganic or organic bases. These preferably include alkali metal hydroxides, for example lithium hydroxide, sodium hydroxide or potassium hydroxide, alkali metal or alkaline earth metal carbonates such as lithium carbonate, sodium carbonate, potassium carbonate, calcium carbonate or caesium carbonate, if appropriate with addition of an alkali metal iodide, for example sodium iodide or potassium iodide, alkali alkoxides such as sodium methoxide or potassium methoxide, sodium ethoxide or potassium ethoxide or sodium tert-butoxide or potassium tert-butoxide, alkali metal hydrides such as sodium hydride or potassium hydride, amides such as sodium amide, lithium bis(trimethylsilyl)amide or potassium bis(trimethylsilyl)amide or lithium diisopropylamide, or organic amines such as triethylamine, N-methylmorpholine, N-methylpiperidine, N,N-diisopropylethylamine, pyridine, 4-(N,N-dimethylamino)pyridine (DMAP), 1,5-diazabicyclo[4.3.0]non-5-ene (DBN), 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) or 1,4-diazabicyclo[2.2.2]octane (DABCO®). Preference is given to using potassium carbonate, caesium carbonate or sodium methoxide.
The reaction is generally carried out in a temperature range of from 0° C. to +120° C., preferably at from +20° C. to +80° C., if appropriate in a microwave. The reaction can be carried out at atmospheric, elevated or reduced pressure (for example from 0.5 to 5 bar).
Preferred for use as amino protective group is tert-butoxycarbonyl (Boc) or benzyloxycarbonyl (Z). As protective group for a hydroxyl or carboxyl function, preference is given to using tert-butyl or benzyl. The removal of these protective groups is carried out by customary methods, preferably by reaction with a strong acid such as hydrogen chloride, hydrogen bromide or trifluoroacetic acid in an inert solvent such as dioxane, diethyl ether, dichloromethane or acetic acid; if appropriate, the removal can also be carried out without any additional inert solvent. In the case of benzyl and benzyloxycarbonyl as protective group, these can also be removed by hydrogenolysis in the presence of a palladium catalyst. If appropriate, the removal of the protective groups mentioned can be performed simultaneously in a one-pot reaction or in separate reaction steps.
Here, the removal of the benzyl group in reaction step (I-B)→(V) is carried out by customary methods known from protective group chemistry, preferably by hydrogenolysis in the presence of a palladium catalyst such as palladium on activated carbon in an inert solvent, for example ethanol or ethyl acetate [see also, for example, T. W. Greene and P. G. M. Wuts, Protective Groups in Organic Synthesis, Wiley, New York, 1999].
The compounds of the formula (II) are known from the literature or can be prepared by reacting a compound of the formula (VII)




in which R4, R5 and R6 have the meanings given above,

in an inert solvent in the presence of a suitable base with a compound of the formula (VI) to give a compound of the formula (VIII)





in which R1, R4, R5 and R6 each have the meanings given above, and this is then reacted in an inert solvent with a compound of the formula (IX)





in which R2 and T1 each have the meanings given above.

The process described is illustrated in an exemplary manner by the scheme below (Scheme 3):




The synthesis sequence shown can be modified such that the respective reaction steps are carried out in a different order. An example of such a modified synthesis sequence is shown in Scheme 4.




Inert solvents for the ring closure affording the imidazo[1,2-a]pyridine skeleton (VIII)+(IX)→(II) or (VII)+(IX)→(X) are the customary organic solvents. These preferably include alcohols such as methanol, ethanol, n-propanol, isopropanol, n-butanol, n-pentanol or tert-butanol, or ethers such as diethyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, dioxane or glycol dimethyl ether, or other solvents such as acetone, dichloromethane, 1,2-dichloroethane, acetonitrile, dimethylformamide or dimethyl sulphoxide. It is also possible to use mixtures of the solvents mentioned. Preference is given to using ethanol.
The ring closure is usually carried out in a temperature range from +50° C. to +150° C., preferably at from +50° C. to +100° C., if appropriate in a microwave oven.
The ring closure (VIII)+(IX)→(II) or (VII)+(IX)→(X) is optionally carried out in the presence of dehydrating agents, for example in the presence of molecular sieve (pore size 4A) or using a water separator. The reaction (VIII)+(IX)→(II) or (VII)+(IX)→(X) is carried out using an excess of the reagent of the formula (IX), for example using 1 to 20 equivalents of reagent (IX), if appropriate with addition of bases (such as sodium bicarbonate), where the addition of this reagent can be carried out once or in several portions.
Alternatively to the introductions of R1 shown in Schemes 1 to 4 by reaction of the compounds (V), (VII) or (X) with compounds of the formula (VI), it is also possible—as shown in Scheme 5—to react these intermediates with alcohols of the formula (XI) under the conditions of the Mitsunobu reaction.




Typical reaction conditions for such Mitsunobu condensations of phenols with alcohols can be found in the relevant literature, for example Hughes, D. L. Org. React. 1992, 42, 335; Dembinski, R. Eur. J. Org. Chem. 2004, 2763. Typically, the compound is reacted with an activating agent, for example diethyl azodicarboxylate (DEAD) or diisopropyl azodicarboxylate (DIAD), and a phosphine reagent, for example triphenylphosphine or tributylphosphine, in an inert solvent, for example THF, dichloromethane, toluene or DMF, at a temperature between 0° C. and the boiling point of the solvent employed.
Further compounds according to the invention can optionally also be prepared by converting functional groups of individual substituents, in particular those listed under R3, starting with the compounds of the formula (I) obtained by the above processes. These conversions are carried out by customary methods known to the person skilled in the art and include, for example, reactions such as nucleophilic and electrophilic substitutions, oxidations, reductions, hydrogenations, transition metal-catalyzed coupling reactions, eliminations, alkylation, amination, esterification, ester cleavage, etherification, ether cleavage, formation of carboxamides, and also the introduction and removal of temporary protective groups.
The compounds according to the invention have useful pharmacological properties and can be employed for the prevention and treatment of disorders in humans and animals. The compounds according to the invention open up a further treatment alternative and are therefore an enrichment of pharmacy.
The compounds according to the invention bring about vessel relaxation and inhibition of thrombocyte aggregation and lead to a lowering of blood pressure and to an increase in coronary blood flow. These effects are due to direct stimulation of soluble guanylate cyclase and an increase in intracellular cGMP. Moreover, the compounds according to the invention intensify the action of substances that raise the cGMP level, for example EDRF (endothelium-derived relaxing factor), NO donors, protoporphyrin IX, arachidonic acid or phenylhydrazine derivatives.
The compounds according to the invention are suitable for the treatment and/or prophylaxis of cardiovascular, pulmonary, thromboembolic and fibrotic diseases.
The compounds according to the invention can therefore be used in medicinal products for the treatment and/or prophylaxis of cardiovascular diseases, for example high blood pressure (hypertension), resistant hypertension, acute and chronic heart failure, coronary heart disease, stable and unstable angina pectoris, peripheral and cardiac vascular diseases, arrhythmias, disturbances of atrial and ventricular rhythm and conduction disturbances, for example atrioventricular blocks of degree I-III (AVB I-III), supraventricular tachyarrhythmia, atrial fibrillation, atrial flutter, ventricular fibrillation, ventricular flutter, ventricular tachyarrhythmia, torsade-de-pointes tachycardia, atrial and ventricular extrasystoles, AV-junction extrasystoles, sick-sinus syndrome, syncopes, AV-node reentry tachycardia, Wolff-Parkinson-White syndrome, acute coronary syndrome (ACS), autoimmune heart diseases (pericarditis, endocarditis, valvulitis, aortitis, cardiomyopathies), shock such as cardiogenic shock, septic shock and anaphylactic shock, aneurysms, Boxer cardiomyopathy (premature ventricular contraction (PVC)), for the treatment and/or prophylaxis of thromboembolic diseases and ischaemias such as myocardial ischaemia, myocardial infarction, stroke, cardiac hypertrophy, transient ischaemic attacks, preeclampsia, inflammatory cardiovascular diseases, spasms of the coronary arteries and peripheral arteries, development of oedema, for example pulmonary oedema, cerebral oedema, renal oedema or oedema due to heart failure, peripheral perfusion disturbances, reperfusion injury, arterial and venous thromboses, microalbuminuria, myocardial insufficiency, endothelial dysfunction, for preventing restenoses such as after thrombolysis therapies, percutaneous transluminal angioplasty (PTA), transluminal coronary angioplasty (PTCA), heart transplant and bypass operations, and micro- and macrovascular damage (vasculitis), increased level of fibrinogen and of low-density LDL and increased concentrations of plasminogen activator inhibitor 1 (PAI-1), and for the treatment and/or prophylaxis of erectile dysfunction and female sexual dysfunction.
In the sense of the present invention, the term heart failure comprises both acute and chronic manifestations of heart failure, as well as more specific or related forms of disease such as acute decompensated heart failure, right ventricular failure, left ventricular failure, total heart failure, ischaemic cardiomyopathy, dilatated cardiomyopathy, hypertrophic cardiomyopathy, idiopathic cardiomyopathy, congenital heart defects, heart failure with valvular defects, mitral valve stenosis, mitral valve insufficiency, aortic valve stenosis, aortic valve insufficiency, tricuspid stenosis, tricuspid insufficiency, pulmonary valve stenosis, pulmonary valve insufficiency, combined valvular defects, heart muscle inflammation (myocarditis), chronic myocarditis, acute myocarditis, viral myocarditis, diabetic heart failure, alcoholic cardiomyopathy, storage cardiomyopathies, diastolic heart failure and also systolic heart failure and acute phases of an existing chronic heart failure (worsening heart failure).
In addition, the compounds according to the invention can also be used for the treatment and/or prophylaxis of arteriosclerosis, disturbances of lipid metabolism, hypolipoproteinaemias, dyslipidaemias, hypertriglyceridaemias, hyperlipidaemias, hypercholesterolaemias, abetalipoproteinaemia, sitosterolaemia, xanthomatosis, Tangier disease, adiposity, obesity, and combined hyperlipidaemias and metabolic syndrome.
Moreover, the compounds according to the invention can be used for the treatment and/or prophylaxis of primary and secondary Raynaud phenomenon, microcirculation disturbances, claudication, peripheral and autonomic neuropathies, diabetic microangiopathies, diabetic retinopathy, diabetic limb ulcers, gangrene, CREST syndrome, erythematous disorders, onychomycosis, rheumatic diseases and for promoting wound healing.
Furthermore, the compounds according to the invention are suitable for treating urological diseases, for example benign prostatic syndrome (BPS), benign prostatic hyperplasia (BPH), benign prostatic enlargement (BPE), bladder outlet obstruction (BOO), lower urinary tract syndromes (LUTS, including feline urological syndrome (FUS)), diseases of the urogenital system including neurogenic overactive bladder (OAB) and (IC), urinary incontinence (UI) for example mixed, urge, stress, or overflow incontinence (MUI, UUI, SUI, OUI), pelvic pains, benign and malignant diseases of the organs of the male and female urogenital system.
Furthermore, the compounds according to the invention are suitable for the treatment and/or prophylaxis of kidney diseases, in particular acute and chronic renal insufficiency, and acute and chronic renal failure. In the sense of the present invention, the term renal insufficiency comprises both acute and chronic manifestations of renal insufficiency, as well as underlying or related kidney diseases such as renal hypoperfusion, intradialytic hypotension, obstructive uropathy, glomerulopathies, glomerulonephritis, acute glomerulonephritis, glomerulosclerosis, tubulointerstitial diseases, nephropathic diseases such as primary and congenital kidney disease, nephritis, immunological kidney diseases such as kidney transplant rejection, immune complex-induced kidney diseases, nephropathy induced by toxic substances, contrast medium-induced nephropathy, diabetic and non-diabetic nephropathy, pyelonephritis, renal cysts, nephrosclerosis, hypertensive nephrosclerosis and nephrotic syndrome, which can be characterized diagnostically for example by abnormally reduced creatinine and/or water excretion, abnormally increased blood concentrations of urea, nitrogen, potassium and/or creatinine, altered activity of renal enzymes such as e.g. glutamyl synthetase, altered urine osmolarity or urine volume, increased microalbuminuria, macroalbuminuria, lesions of glomeruli and arterioles, tubular dilatation, hyperphosphataemia and/or need for dialysis. The present invention also comprises the use of the compounds according to the invention for the treatment and/or prophylaxis of sequelae of renal insufficiency, for example pulmonary oedema, heart failure, uraemia, anaemia, electrolyte disturbances (e.g. hyperkalaemia, hyponatraemia) and disturbances in bone and carbohydrate metabolism.
Furthermore, the compounds according to the invention are also suitable for the treatment and/or prophylaxis of asthmatic diseases, pulmonary arterial hypertension (PAH) and other forms of pulmonary hypertension (PH), comprising pulmonary hypertension associated with left ventricular disease, HIV, sickle cell anaemia, thromboembolism (CTEPH), sarcoidosis, COPD or pulmonary fibrosis, chronic obstructive pulmonary disease (COPD), acute respiratory distress syndrome (ARDS), acute lung injury (ALI), alpha-1-antitrypsin deficiency (AATD), pulmonary fibrosis, pulmonary emphysema (e.g. smoking-induced pulmonary emphysema) and cystic fibrosis (CF).
The compounds described in the present invention are also active substances for controlling diseases in the central nervous system that are characterized by disturbances of the NO/cGMP system. In particular, they are suitable for improving perception, capacity for concentration, capacity for learning or memory performance after cognitive disturbances, such as occur in particular in situations/diseases/syndromes such as mild cognitive impairment, age-related learning and memory disturbances, age-related memory loss, vascular dementia, head injury, stroke, post-stroke dementia, post-traumatic head injury, general disturbances of concentration, disturbances of concentration in children with learning and memory problems, Alzheimer's disease, Lewy body dementia, dementia with frontal lobe degeneration including Pick's syndrome, Parkinson's disease, progressive nuclear palsy, dementia with corticobasal degeneration, amyotrophic lateral sclerosis (ALS), Huntington's disease, demyelination, multiple sclerosis, thalamic degeneration, Creutzfeldt-Jakob dementia, HIV-dementia, schizophrenia with dementia or Korsakoff psychosis. They are also suitable for the treatment and/or prophylaxis of diseases of the central nervous system such as anxiety, tension and depression, CNS-related sexual dysfunctions and sleep disturbances and for controlling pathological eating disorders and use of luxury foods and addictive drugs.
Furthermore, the compounds according to the invention are also suitable for controlling cerebral perfusion and are effective agents for combating migraines. They are also suitable for the prophylaxis and control of consequences of cerebral infarctions (apoplexia cerebri) such as stroke, cerebral ischaemias and head injury. The compounds according to the invention can also be used for controlling pain states and tinnitus.
In addition, the compounds according to the invention possess anti-inflammatory action and can therefore be used as anti-inflammatory agents for the treatment and/or prophylaxis of sepsis (SIRS), multiple organ failure (MODS, MOF), inflammatory diseases of the kidney, chronic intestinal inflammations (IBD, Crohn's disease, UC), pancreatitis, peritonitis, rheumatoid diseases, inflammatory skin diseases and inflammatory eye diseases.
Moreover, the compounds according to the invention can also be used for the treatment and/or prophylaxis of autoimmune diseases.
Furthermore, the compounds according to the invention are suitable for the treatment and/or prophylaxis of fibrotic diseases of the internal organs, for example of the lung, heart, kidney, bone marrow and in particular of the liver, and dermatological fibroses and fibrotic diseases of the eye. In the sense of the present invention, the term fibrotic diseases comprises in particular the following terms: hepatic fibrosis, hepatic cirrhosis, pulmonary fibrosis, endomyocardial fibrosis, nephropathy, glomerulonephritis, interstitial renal fibrosis, fibrotic lesions as a consequence of diabetes, bone marrow fibrosis and similar fibrotic diseases, scleroderma, morphea, keloids, hypertrophic scars (including after surgery), naevi, diabetic retinopathy, proliferative vitreoretinopathy and connective tissue diseases (e.g. sarcoidosis).
Furthermore, the compounds according to the invention are suitable for controlling postoperative scarring, e.g. as a result of glaucoma operations.
The compounds according to the invention can also be used cosmetically for ageing and keratinizing skin.
Moreover, the compounds according to the invention are suitable for the treatment and/or prophylaxis of hepatitis, neoplasms, osteoporosis, glaucoma and gastroparesis.
The present invention further relates to the use of the compounds according to the invention for the treatment and/or prophylaxis of diseases, in particular the aforementioned diseases.
The present invention further relates to the use of the compounds according to the invention for the treatment and/or prophylaxis of heart failure, angina pectoris, hypertension, pulmonary hypertension, ischaemias, vascular diseases, renal insufficiency, thromboembolic diseases, fibrotic diseases and arteriosclerosis.
The present invention further relates to the compounds according to the invention for use in a method for the treatment and/or prophylaxis of heart failure, angina pectoris, hypertension, pulmonary hypertension, ischaemias, vascular diseases, renal insufficiency, thromboembolic diseases, fibrotic diseases and arteriosclerosis.
The present invention further relates to the use of the compounds according to the invention for producing a medicinal product for the treatment and/or prophylaxis of diseases, in particular the aforementioned diseases.
The present invention further relates to the use of the compounds according to the invention for producing a medicinal product for the treatment and/or prophylaxis of heart failure, angina pectoris, hypertension, pulmonary hypertension, ischaemias, vascular diseases, renal insufficiency, thromboembolic diseases, fibrotic diseases and arteriosclerosis.
The present invention further relates to a method for the treatment and/or prophylaxis of diseases, in particular the aforementioned diseases, using an effective amount of at least one of the compounds according to the invention.
The present invention further relates to a method for the treatment and/or prophylaxis of heart failure, angina pectoris, hypertension, pulmonary hypertension, ischaemias, vascular diseases, renal insufficiency, thromboembolic diseases, fibrotic diseases and arteriosclerosis, using an effective amount of at least one of the compounds according to the invention.
The compounds according to the invention can be used alone or in combination with other active substances if necessary. The present invention further relates to medicinal products containing at least one of the compounds according to the invention and one or more further active substances, in particular for the treatment and/or prophylaxis of the aforementioned diseases. As suitable combination active substances, we may mention for example and preferably:

    
    
        organic nitrates and NO-donors, for example sodium nitroprusside, nitroglycerin, isosorbide mononitrate, isosorbide dinitrate, molsidomine or SIN-1, and inhalational NO;
        compounds that inhibit the degradation of cyclic guanosine monophosphate (cGMP), for example inhibitors of phosphodiesterases (PDE) 1, 2 and/or 5, in particular PDE-5 inhibitors such as sildenafil, vardenafil and tadalafil;
        antithrombotic agents, for example and preferably from the group of platelet aggregation inhibitors, anticoagulants or profibrinolytic substances;
        active substances for lowering blood pressure, for example and preferably from the group of calcium antagonists, angiotensin AII antagonists, ACE inhibitors, endothelin antagonists, renin inhibitors, alpha-blockers, beta-blockers, mineralocorticoid receptor antagonists and diuretics; and/or
        active substances that alter fat metabolism, for example and preferably from the group of thyroid receptor agonists, cholesterol synthesis inhibitors such as for example and preferably HMG-CoA-reductase or squalene synthesis inhibitors, ACAT inhibitors, CETP inhibitors, MTP inhibitors, PPAR-alpha, PPAR-gamma and/or PPAR-delta agonists, cholesterol absorption inhibitors, lipase inhibitors, polymeric bile acid adsorbers, bile acid reabsorption inhibitors and lipoprotein(a) antagonists.
    
    


Antithrombotic agents are preferably to be understood as compounds from the group of platelet aggregation inhibitors, anticoagulants or profibrinolytic substances.
In a preferred embodiment of the invention, the compounds according to the invention are administered in combination with a platelet aggregation inhibitor, for example and preferably aspirin, clopidogrel, ticlopidine or dipyridamole.
In a preferred embodiment of the invention, the compounds according to the invention are administered in combination with a thrombin inhibitor, for example and preferably ximelagatran, dabigatran, melagatran, bivalirudin or Clexane.
In a preferred embodiment of the invention, the compounds according to the invention are administered in combination with a GPIIb/IIIa antagonist, for example and preferably tirofiban or abciximab.
In a preferred embodiment of the invention, the compounds according to the invention are administered in combination with a factor Xa inhibitor, for example and preferably rivaroxaban (BAY 59-7939), DU-176b, apixaban, otamixaban, fidexaban, razaxaban, fondaparinux, idraparinux, PMD-3112, YM-150, KFA-1982, EMD-503982, MCM-17, MLN-1021, DX 9065a, DPC 906, JTV 803, SSR-126512 or SSR-128428.
In a preferred embodiment of the invention, the compounds according to the invention are administered in combination with heparin or a low molecular weight (LMW) heparin derivative.
In a preferred embodiment of the invention, the compounds according to the invention are administered in combination with a vitamin K antagonist, for example and preferably coumarin.
The agents for lowering blood pressure are preferably to be understood as compounds from the group of calcium antagonists, angiotensin AII antagonists, ACE inhibitors, endothelin antagonists, renin inhibitors, alpha-blockers, beta-blockers, mineralocorticoid-receptor antagonists and diuretics.
In a preferred embodiment of the invention, the compounds according to the invention are administered in combination with a calcium antagonist, for example and preferably nifedipine, amlodipine, verapamil or diltiazem.
In a preferred embodiment of the invention, the compounds according to the invention are administered in combination with an alpha-1-receptor blocker, for example and preferably prazosin.
In a preferred embodiment of the invention, the compounds according to the invention are administered in combination with a beta-blocker, for example and preferably propranolol, atenolol, timolol, pindolol, alprenolol, oxprenolol, penbutolol, bupranolol, metipranolol, nadolol, mepindolol, carazolol, sotalol, metoprolol, betaxolol, celiprolol, bisoprolol, carteolol, esmolol, labetalol, carvedilol, adaprolol, landiolol, nebivolol, epanolol or bucindolol.
In a preferred embodiment of the invention, the compounds according to the invention are administered in combination with an angiotensin AII antagonist, for example and preferably losartan, candesartan, valsartan, telmisartan or embursatan.
In a preferred embodiment of the invention, the compounds according to the invention are administered in combination with an ACE inhibitor, for example and preferably enalapril, captopril, lisinopril, ramipril, delapril, fosinopril, quinopril, perindopril or trandopril.
In a preferred embodiment of the invention, the compounds according to the invention are administered in combination with an endothelin antagonist, for example and preferably bosentan, darusentan, ambrisentan or sitaxsentan.
In a preferred embodiment of the invention, the compounds according to the invention are administered in combination with a renin inhibitor, for example and preferably aliskiren, SPP-600 or SPP-800.
In a preferred embodiment of the invention, the compounds according to the invention are administered in combination with a mineralocorticoid-receptor antagonist, for example and preferably spironolactone or eplerenone.
In a preferred embodiment of the invention, the compounds according to the invention are administered in combination with a loop diuretic, for example furosemide, torasemide, bumetanide and piretanide, with potassium-sparing diuretics for example amiloride and triamterene, with aldosterone antagonists, for example spironolactone, potassium canrenoate and eplerenone and thiazide diuretics, for example hydrochlorothiazide, chlorthalidone, xipamide, and indapamide.
Agents altering fat metabolism are preferably to be understood as compounds from the group of CETP inhibitors, thyroid receptor agonists, cholesterol synthesis inhibitors such as HMG-CoA-reductase or squalene synthesis inhibitors, the ACAT inhibitors, MTP inhibitors, PPAR-alpha, PPAR-gamma and/or PPAR-delta agonists, cholesterol-absorption inhibitors, polymeric bile acid adsorbers, bile acid reabsorption inhibitors, lipase inhibitors and the lipoprotein(a) antagonists.
In a preferred embodiment of the invention, the compounds according to the invention are administered in combination with a CETP inhibitor, for example and preferably dalcetrapib, BAY 60-5521, anacetrapib or CETP-vaccine (CETi-1).
In a preferred embodiment of the invention, the compounds according to the invention are administered in combination with a thyroid receptor agonist, for example and preferably D-thyroxin, 3,5,3′-triiodothyronin (T3), CGS 23425 or axitirome (CGS 26214).
In a preferred embodiment of the invention, the compounds according to the invention are administered in combination with an HMG-CoA-reductase inhibitor from the class of statins, for example and preferably lovastatin, simvastatin, pravastatin, fluvastatin, atorvastatin, rosuvastatin or pitavastatin.
In a preferred embodiment of the invention, the compounds according to the invention are administered in combination with a squalene synthesis inhibitor, for example and preferably BMS-188494 or TAK-475.
In a preferred embodiment of the invention, the compounds according to the invention are administered in combination with an ACAT inhibitor, for example and preferably avasimibe, melinamide, pactimibe, eflucimibe or SMP-797.
In a preferred embodiment of the invention, the compounds according to the invention are administered in combination with an MTP inhibitor, for example and preferably implitapide, BMS-201038, R-103757 or JTT-130.
In a preferred embodiment of the invention, the compounds according to the invention are administered in combination with a PPAR-gamma agonist, for example and preferably pioglitazone or rosiglitazone.
In a preferred embodiment of the invention, the compounds according to the invention are administered in combination with a PPAR-delta agonist, for example and preferably GW 501516 or BAY 68-5042.
In a preferred embodiment of the invention, the compounds according to the invention are administered in combination with a cholesterol-absorption inhibitor, for example and preferably ezetimibe, tiqueside or pamaqueside.
In a preferred embodiment of the invention, the compounds according to the invention are administered in combination with a lipase inhibitor, for example and preferably orlistat.
In a preferred embodiment of the invention, the compounds according to the invention are administered in combination with a polymeric bile acid adsorber, for example and preferably cholestyramine, colestipol, colesolvam, CholestaGel or colestimide.
In a preferred embodiment of the invention, the compounds according to the invention are administered in combination with a bile acid reabsorption inhibitor, for example and preferably ASBT (=IBAT) inhibitors, e.g. AZD-7806, S-8921, AK-105, BARI-1741, SC-435 or SC-635.
In a preferred embodiment of the invention, the compounds according to the invention are administered in combination with a lipoprotein(a) antagonist, for example and preferably gemcabene calcium (CI-1027) or nicotinic acid.
The present invention further relates to medicinal products that contain at least one compound according to the invention, usually together with one or more inert, non-toxic, pharmaceutically suitable excipients, and use thereof for the aforementioned purposes.
The compounds according to the invention can have systemic and/or local action. For this purpose they can be applied in a suitable way, e.g. by oral, parenteral, pulmonary, nasal, sublingual, lingual, buccal, rectal, dermal, transdermal, conjunctival, or otic administration or as implant or stent.
For these routes of application, the compounds according to the invention can be administered in suitable dosage forms.
Dosage forms functioning according to the prior art, for rapid and/or modified release of the compounds according to the invention, which contain the compounds according to the invention in crystalline and/or amorphized and/or dissolved form, e.g. tablets (uncoated or coated tablets, for example with enteric coatings or coatings with delayed dissolution or insoluble coatings, which control the release of the compound according to the invention), tablets or films/wafers that disintegrate rapidly in the oral cavity, films/lyophilizates, capsules (for example hard or soft gelatin capsules), sugar-coated pills, granules, pellets, powders, emulsions, suspensions, aerosols or solutions, are suitable for oral administration.
Parenteral administration can take place avoiding an absorption step (e.g. intravenous, intraarterial, intracardiac, intraspinal or intralumbar) or including absorption (e.g. intramuscular, subcutaneous, intracutaneous, percutaneous or intraperitoneal). Injection and infusion preparations in the form of solutions, suspensions, emulsions, lyophilizates or sterile powders are suitable, among others, as dosage forms for parenteral application.
Inhaled pharmaceutical forms (including powder inhalers, nebulizers), nasal drops, solutions or sprays, tablets, films/wafers or capsules for lingual, sublingual or buccal application, suppositories, ear or eye preparations, vaginal capsules, aqueous suspensions (lotions, shaking mixtures), lipophilic suspensions, ointments, creams, transdermal therapeutic systems (e.g. patches), milk, pastes, foams, dusting powders, implants or stents for example are suitable for other routes of administration.
Oral or parenteral administration is preferred, especially oral administration.
The compounds according to the invention can be transformed to the aforementioned dosage forms. This can take place in a manner known per se by mixing with inert, non-toxic, pharmaceutically suitable excipients. These excipients include inter alia carriers (for example microcrystalline cellulose, lactose, mannitol), solvents (e.g. liquid polyethylene glycols), emulsifiers and dispersants or wetting agents (for example sodium dodecyl sulphate, polyoxysorbitan oleate), binders (for example polyvinylpyrrolidone), synthetic and natural polymers (for example albumin), stabilizers (e.g. antioxidants such as ascorbic acid), colorants (e.g. inorganic pigments, for example iron oxides) and taste and/or odour correctants.
In general, it has proved advantageous, in the case of parenteral administration, to administer amounts of about 0.001 to 1 mg/kg, preferably about 0.01 to 0.5 mg/kg body weight to achieve effective results. For oral application, the dosage is about 0.001 to 2 mg/kg, preferably about 0.001 to 1 mg/kg body weight.
Nevertheless, it may optionally be necessary to deviate from the stated amounts, namely depending on body weight, route of administration, individual response to the active substance, type of preparation and time point or interval when application takes place. Thus, in some cases it may be sufficient to use less than the aforementioned minimum amount, whereas in other cases the stated upper limit must be exceeded. When applying larger amounts, it may be advisable to distribute these in several individual doses throughout the day.
The following practical examples explain the invention. The invention is not limited to the examples.
The percentages in the following tests and examples are percentages by weight, unless stated otherwise; parts are parts by weight. Proportions of solvents, dilution ratios and concentrations for liquid/liquid solutions refer in each case to the volume.


A. EXAMPLES
Abbreviations and Acronyms













abs.
absolute (=dried)


aq.
aqueous solution


br
broad signal (NMR coupling pattern)


δ
shift in the NMR spectrum (stated in ppm)


d
doublet (NMR coupling pattern)


DCI
direct chemical ionization (in MS)


DMAP
4-N,N-dimethylaminopyridine


DMF
dimethylformamide


DMSO
dimethyl sulphoxide


ent
enantiomerically pure


eq.
equivalent(s)


ESI
electrospray ionization (in MS)


Et
ethyl


h
hour(s)


HPLC
high pressure, high performance liquid chromatography


HRMS
high resolution mass spectrometry


konz.
concentrated


LC/MS
liquid chromatography-coupled mass spectrometry


LiHMDS
lithium hexamethyldisilazide


m
multiplet


Me
methyl


min
minute(s)


MS
mass spectrometry


NMR
nuclear magnetic resonance spectrometry


Ph
phenyl


q
quartet (NMR coupling pattern)


quint.
quintet (NMR coupling pattern)


rac
racemic


RT
room temperature


Rt
retention time (in HPLC)


s
singulet (NMR coupling pattern)


t
triplet (NMR coupling pattern)


TFA
trifluoroacetic acid


THF
tetrahydrofuran


TBTU
(benzotriazol-1-yloxy)bisdimethylaminomethylium



fluoroborate


UV
ultraviolet spectrometry


v/v
ratio by volume (of a solution)


XPHOS
dicyclohexyl-(2′,4′,6′-triisopropylbiphenyl-2-yl)phosphine









LC/MS and HPLC Methods:

Method 1 (LC-MS):

Instrument: Micromass Quattro Premier with Waters UPLC Acquity; column: Thermo Hypersil GOLD 1.9μ50×1 mm; mobile phase A: 1 l of water+0.5 ml of 50% strength formic acid, mobile phase B: 1 l of acetonitrile+0.5 ml of 50% strength formic acid; gradient: 0.0 min 90% A→0.1 min 90% A→1.5 min 10% A→2.2 min 10% A oven: 50° C.; flow rate: 0.33 ml/min; UV detection: 210 nm.
Method 2 (LC-MS):
Instrument: Waters ACQUITY SQD UPLC System; column: Waters Acquity UPLC HSS T3 1.8μ50×1 mm; mobile phase A: 1 l of water+0.25 ml of 99% strength formic acid, mobile phase B: 1 l of acetonitrile+0.25 ml of 99% strength formic acid; gradient: 0.0 min 90% A→1.2 min 5% A→2.0 min 5% A oven: 50° C.; flow rate: 0.40 ml/min; UV detection: 210-400 nm.
Method 3 (LC-MS):
MS instrument type: Waters Micromass Quattro Micro; HPLC instrument type: Agilent 1100 Series; column: Thermo Hypersil GOLD 3μ20 mm×4 mm; mobile phase A: 1 l of water+0.5 ml of 50%-strength formic acid, mobile phase B: 1 l of acetonitrile+0.5 ml of 50% strength formic acid; gradient: 0.0 min 100% A→3.0 min 10% A→4.0 min 10% A→4.01 min 100% A (flow rate 2.5 ml/min)→5.00 min 100% A; oven: 50° C.; flow rate: 2 ml/min; UV detection: 210 nm.
Method 4 (DCI-MS):
Instrument: Thermo Fisher-Scientific DSQ; chemical ionization; reactant gas NH3; source temperature: 200° C.; ionization energy 70 eV.
Method 5 (LC-MS):
MS instrument type: Waters (Micromass) Quattro Micro; HPLC instrument type: Agilent 1100 Series; column: Thermo Hypersil GOLD 3μ20×4 mm; mobile phase A: 1 l of water+0.5 ml of 50% strength formic acid, mobile phase B: 1 l of acetonitrile+0.5 ml of 50% strength formic acid; gradient: 0.0 min 100% A→3.0 min 10% A→4.0 min 10% A; oven: 50° C.; flow rate: 2 ml/min; UV detection: 210 nm
Method 6 (GC-MS):
Instrument: Micromass GCT, GC6890; column: Restek RTX-35, 15 m×200 μm×0.33 μm; constant helium flow rate: 0.88 ml/min; oven: 70° C.; inlet: 250° C.; gradient: 70° C., 30° C./min→310° C. (maintained for 3 min).
Method 7 (LC-MS):
Instrument: Waters ACQUITY SQD UPLC System; column: Waters Acquity UPLC HSS T3 1.8μ30×2 mm; mobile phase A: 1 l of water+0.25 ml of 99% strength formic acid, mobile phase B: 1 l of acetonitrile+0.25 ml of 99% strength formic acid; gradient: 0.0 min 90% A→1.2 min 5% A→2.0 min 5% A oven: 50° C.; flow rate: 0.60 ml/min; UV detection: 208-400 nm.
Method 8 (LC-MS):
MS instrument: Waters SQD; HPLC instrument: Waters UPLC; column: Zorbax SB-Aq (Agilent), 50 mm×2.1 mm, 1.8 μm; mobile phase A: water+0.025% formic acid, mobile phase B: acetonitrile (ULC)+0.025% formic acid; gradient: 0.0 min 98% A-0.9 min 25% A-1.0 min 5% A-1.4 min 5% A-1.41 min 98% A-1.5 min 98% A; oven: 40° C.; flow rate: 0.600 ml/min; UV detection: DAD; 210 nm.
Method 9 (Preparative HPLC):
Column: Macherey-Nagel VP 50/21 Nucleosil 100-5 C18 Nautilus. Flow rate: 25 ml/min. gradient: A=water+0.1% conc. aqueous ammonia, B=methanol, 0 min=30% B, 2 min=30% B, 6 min=100% B, 7 min=100% B, 7.1 min=30% B, 8 min=30% B, flow rate 25 ml/min, UV detection 220 nm.
Method 10 (FIA/MS, ES):
Instrument: Waters ZQ 2000; electrospray ionization; mobile phase A: 1 l of water+0.25 ml of 99% strength formic acid, mobile phase B: 1 l of acetonitrile+0.25 ml of 99% strength formic acid; 25% A, 75% B; flow rate: 0.25 ml/min
Method 11:
MS instrument: Waters (Micromass) Quattro Micro; HPLC instrument: Agilent 1100 Series; column: YMC-Triart C18 3μ50×3 mm; mobile phase A: 1 l of water+0.01 mol of ammonium carbonate, mobile phase B: 1 l of acetonitrile; gradient: 0.0 min 100% A→2.75 min 5% A→4.5 min 5% A; oven: 40° C.; flow rate: 1.25 ml/min; UV detection: 210 nm
Method 12 (preparative LC-MS):
MS instrument: Waters, HPLC instrument: Waters (column Waters X-Bridge C18, 18 mm×50 mm, 5 μm, mobile phase A: water+0.05% triethylamine, mobile phase B: acetonitrile (ULC)+0.05% triethylamine, gradient: 0.0 min 95% A-0.15 min 95% A-8.0 min 5% A-9.0 min 5% A; flow rate: 40 ml/min; UV detection: DAD; 210-400 nm).
or
MS instrument: Waters, HPLC instrument: Waters (column Phenomenex Luna 5μ C18(2) 100A, AXIA Tech. 50×21.2 mm, mobile phase A: water+0.05% formic acid, mobile phase B: acetonitrile (ULC)+0.05% formic acid, gradient: 0.0 min 95% A-0.15 min 95% A-8.0 min 5% A-9.0 min 5% A; flow rate: 40 ml/min; UV detection: DAD; 210-400 nm).
Method 13
Instrument: Micromass Quattro Premier with Waters UPLC Acquity; column: Thermo Hypersil GOLD 1.9μ50×1 mm; mobile phase A: 1 l of water+0.5 ml of 50% strength formic acid, mobile phase B: 1 l of acetonitrile+0.5 ml of 50% strength formic acid; gradient: 0.0 min 97% A→0.5 min 97% A→3.2 min 5% A→4.0 min 5% A oven: 50° C.; flow rate: 0.3 ml/min; UV-detection: 210 nm.
If compounds according to the invention are purified by preparative HPLC according to the methods described above where the mobile phases contain additives such as trifluoroacetic acid, formic acid or ammonia, the compounds according to the invention may be obtained in salt form, for example as trifluoroacetate, formate or ammonium salt, if the compounds according to the invention contain a functionality which is sufficiently basic or acidic. Such a salt may be converted by various methods known to the person skilled in the art into the corresponding free base or acid, respectively.
Salts may be present in substoichiometric or superstoichiometric amounts, in particular if an amine or a carboxylic acid is present. In addition, in the case of the present imidazopyridines, under acidic conditions there may always be salts present, even in substoichiometric amounts, without this being obvious from the 1H NMR, and without particular indication and labelling of these in the respective IUPAC names and structural formulae.
The multiplicities of proton signals in the 1H NMR spectra given in the paragraphs below indicate the signal form observed in each case and do not take into account any higher order signal phenomena.
X-Ray Structure Analysis:
Transmission diffractometer: Bruker diffractometer with Apex-II-CCD detector
Radiation: copper, K alpha
Primary monochromator: focussing X-ray mirror
Measuring range: 4.73-67.08°
Room conditions: 20° C.
General Working Procedures
Representative Working Procedure 1
Reduction of Amino Acids Using Lithium Borohydride and Chlorotrimethylsilane.
1.7-2.5 equivalents of lithium borohydride were initially charged in THF (about 0.1-0.5 M based on the amino acid), 3.4-5.0 equivalents of chlorotrimethylsilane were added (at 0° C. or RT) and the mixture was stirred at RT for five to 30 min. 1 equivalent of the amino acid was then carefully added a little at a time at 0° C. or RT and the reaction mixture was stirred at RT overnight.
Exemplary work-up of the reaction mixture: Methanol was added and the mixture was concentrated. A 20% potassium hydroxide solution was added to the residue and the mixture was extracted three times with dichloromethane. The combined organic phases were dried over sodium sulphate, filtered and concentrated.
Representative Working Procedure 2
Amide Formation Using TBTU as Coupling Agent.
1 equivalent of the carboxylic acid to be coupled (for example Example 3A), 1.1-1.5 equivalents of (benzotriazol-1-yloxy)bisdimethylaminomethylium fluoroborate (TBTU) and 3-6 equivalents of 4-methylmorpholine were initially charged in DMF or dichloromethane (about 0.1-0.2 M based on the carboxylic acid to be coupled). 1.1 to 1.5 equivalents of the amine to be coupled were then added, and the mixture was stirred at RT overnight.
Exemplary work-up of the reaction mixture: Water was added to the reaction solution and the precipitate formed stirred for 0.5-1.0 h, filtered off, washed thoroughly with water and dried under high vacuum overnight. Alternatively, the reaction mixture was concentrated directly, purified further by preparative HPLC and dried under high vacuum overnight.
If appropriate, the reaction mixture was filtered off and the precipitate was washed with diethyl ether and dried under high vacuum.
If appropriate, the reaction mixture was diluted with diethyl ether, the precipitate was filtered off and the filtrate was partitioned between ethyl acetate or dichloromethane and saturated aqueous sodium bicarbonate solution. The organic phase was washed with saturated aqueous sodium chloride solution, dried over sodium sulphate and filtered, and the filtrate was concentrated and dried under high vacuum.
Representative Working Procedure 3
Amide Formation Using HATU as Coupling Agent.
1 equivalent of the carboxylic acid to be coupled (for example Example 3A, 6A, 11A, 16A, 19A, 21A, 25A, 28A or 30A), 1.1 to 2.5 equivalents of O-(7-azabenzotriazol-1-yl)-N,N,N′N′-tetramethyluronium hexafluorophosphate (HATU) and 3 to 4 equivalents of N,N-diisopropyl ethylamine were initially charged in DMF (about 0.2 M based on the carboxylic acid to be coupled), 1.2 to 2.0 equivalents of the amine to be coupled were added and the mixture was stirred at RT overnight.
Exemplary work-up of the reaction mixture: Water was added to the reaction solution and the precipitate formed stirred for 30 min, filtered off, washed thoroughly with water and dried under high vacuum overnight. Alternatively, either directly after concentration under reduced pressure or after extractive work-up, the reaction mixture was purified further by preparative HPLC.
Starting Materials and Intermediates
Example 1A
3-[(2,6-Difluorobenzyl)oxy]pyridine-2-amine




At RT, 51 g of sodium methoxide (953 mmol, 1.05 equivalents) were initially charged in 1000 ml of methanol, 100 g of 2-amino-3-hydroxypyridine (908 mmol, 1 equivalent) were added and the mixture was stirred at RT for another 15 min. The reaction mixture was concentrated under reduced pressure, the residue was taken up in 2500 ml of DMSO and 197 g of 2,6-difluorobenzyl bromide (953 mmol, 1.05 equivalents) were added. After 4 h at RT, the reaction mixture was poured into 20 l of water and stirred for 15 min, and the solid was filtered off. The solid was washed with 1 l of water, 100 ml of isopropanol and 500 ml of petroleum ether and dried under high vacuum. This gave 171 g of the title compound (78% of theory).
1H NMR (400 MHz, DMSO-d6): δ=5.10 (s, 2H); 5.52 (br. s, 2H), 6.52 (dd, 1H); 7.16-7.21 (m, 3H); 7.49-7.56 (m, 2H).
Example 2A
Ethyl 8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylate 




170 g of 3-[(2,6-difluorobenzyl)oxy]pyridine-2-amine (Example 1A; 719 mmol, 1 equivalent) were initially charged in 3800 ml of ethanol, and 151 g of powdered molecular sieve 3 Å and 623 g of ethyl 2-chloroacetoacetate (3.6 mol, 5 equivalents) were added. The reaction mixture was heated at reflux for 24 h and then filtered off through silica gel and concentrated under reduced pressure. The mixture was kept at RT for 48 h, and the solid formed was filtered off. The solid was then stirred three times with a little isopropanol and then filtered off and washed with diethyl ether. This gave 60.8 g (23% of theory) of the title compound. The combined filtrates of the filtration steps were concentrated and the residue was chromatographed on silica gel using cyclohexane/diethyl ether as mobile phase. This gave a further 46.5 g (18% of theory; total yield: 41% of theory) of the title compound.
LC-MS (Method 2): Rt=1.01 min
MS (ESpos): m/z=347 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.36 (t, 3H); 2.54 (s, 3H; obscured by DMSO signal); 4.36 (q, 2H); 5.33 (s, 2H); 7.11 (t, 1H); 7.18-7.27 (m, 3H); 7.59 (quint, 1H); 8.88 (d, 1H).
Example 3A
8-[(2,6-Difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid 




107 g of ethyl 8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylate (Example 2A; 300 mmol, 1 equivalent) were dissolved in 2.8 l of THF/methanol (1:1), 1.5 of 1 N aqueous lithium hydroxide solution (1.5 mol, 5 equivalents) were added and the mixture was stirred at RT for 16 h. The organic solvents were removed under reduced pressure and the resulting aqueous solution was adjusted in an ice bath to pH 3-4 using 1 N aqueous hydrochloric acid. The resulting solid was filtered off, washed with water and isopropanol and dried under reduced pressure. This gave 92 g (95% of theory) of the title compound.
LC-MS (Method 2): Rt=0.62 min
MS (ESpos): m/z=319.1 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=2.55 (s, 3H; superimposed by DMSO signal); 5.32 (s, 2H); 7.01 (t, 1H); 7.09 (d, 1H); 7.23 (t, 2H); 7.59 (quint, 1H); 9.01 (d, 1H).
Example 4A
3-(Cyclohexylmethoxy)pyridine-2-amine




At RT, 96 g of sodium hydroxide 45% strength in water (1081 mmol, 1 equivalent) were initially charged in 1170 ml of methanol, 119 g of 2-amino-3-hydroxypyridine (1080 mmol, 1 equivalent) were added and the mixture was stirred at RT for 10 min. The reaction mixture was concentrated under reduced pressure, the residue was taken up in 2900 ml of DMSO and 101 g of cyclohexylmethyl bromide (1135 mmol, 1.05 equivalents) were added. After 16 h at RT, the reaction mixture was added slowly to 6 l of water and the aqueous solution was extracted twice with in each case 21 of ethyl acetate. The combined organic phases were washed with in each case 1 l of saturated aqueous sodium bicarbonate solution and water, dried, filtered and concentrated. The residue was triturated with 500 ml of n-pentane, filtered and dried under reduced pressure. This gave 130 g (58% of theory) of the title compound.
LC-MS (Method 3): Rt=1.41 min
MS (ESpos): m/z=207.1 (M+H)+
Example 5A
Ethyl 8-(cyclohexylmethoxy)-2-methylimidazo[1,2-a]pyridine-3-carboxylate




130 g of 3-(cyclohexylmethoxy)pyridine-2-amine (Example 4A; 630 mmol, 1 equivalent) were initially charged in 3950 ml of ethanol, and 436 ml of ethyl 2-chloroacetoacetate (3.2 mol, 5 equivalents) were added. The mixture was heated under reflux for 24 h and then concentrated under reduced pressure. The crude product obtained in this manner was chromatographed on silica gel using cyclohexane/diethyl ether as mobile phase, giving 66.2 g (33% of theory) of the title compound.
LC-MS (Method 2): Rt=1.17 min
MS (ESpos): m/z=317.1 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.02-1.31 (m, 5H); 1.36 (t, 3H); 1.64-1.77 (m, 3H); 1.79-1.90 (m, 3H); 2.60 (s, 3H); 3.97 (d, 2H); 4.35 (q, 2H); 6.95 (d, 1H); 7.03 (t, 1H); 8.81 (d, 1H).
Example 6A
8-(Cyclohexylmethoxy)-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid




50 g of ethyl 8-(cyclohexylmethoxy)-2-methylimidazo[1,2-a]pyridine-3-carboxylate (Example 5A; 158 mmol, 1 equivalent) were dissolved in 600 ml of 1,4-dioxane, 790 ml of 2 N aqueous sodium hydroxide solution (1.58 mol, 10 equivalents) were added and the mixture was stirred at RT for 16 h. 316 ml of 6 N hydrochloric acid were added, and the mixture was reduced to about 1⁄5 of the total volume. The resulting solid was filtered off, washed with water and tert-butyl methyl ether and dried under reduced pressure. This gave 35 g (74% of theory) of the title compound.
LC-MS (Method 2): Rt=0.81 min
MS (ESpos): m/z=289.0 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.03-1.44 (m, 5H); 1.64-1.78 (m, 3H); 1.81-1.92 (m, 3H); 2.69 (s, 3H); 4.07 (d, 2H); 7.30-7.36 (m, 2H); 9.01 (d, 1H).
Example 7A
5-Fluoro-2-nitropyridin-3-ol




With ice cooling, 5 g of 5-fluoropyridin-3-ol (44 mmol, 1 equivalent) were dissolved in 43 ml of concentrated sulphuric acid, and, at 0° C., 2.8 ml of concentrated nitric acid were added over a period of 5 min. The reaction was warmed to RT, and stirring was continued overnight. The mixture was added to 100 g of ice and stirred for 30 min. The solid obtained was filtered off and dried under reduced pressure. This gave 5.6 g (81% of theory) of the title compound, which were used without further purification for the next reaction.
LC-MS (Method 2): Rt=0.45 min
MS (ESneg): m/z=156.9 (M−H)−
1H NMR (400 MHz, DMSO-d6): δ=7.5 (dd, 1H); 8.08 (d, 1H); 12.2 (br. s, 1H).
Example 8A
2-Amino-5-fluoropyridin-3-ol




5.6 g of 5-fluoro-2-nitropyridin-3-ol (Example 7A; 36 mmol) were dissolved in 2 l of ethanol, a catalytic amount of palladium on activated carbon (10%) was added and the mixture was hydrogenated under standard hydrogen pressure for 16 h. The mixture was filtered off through silica gel and the filtrate was concentrated (product batch 1). The filter cake was rinsed with methanol until the colour of the filtrate was no longer yellowish. The filtrate was concentrated, giving a second product batch. This gave 4.26 g (85% of theory) of the title compound.
LC-MS (Method 2): Rt=0.17 min
MS (ESpos): m/z=128.9 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=5.4 (br. s, 2H); 6.8 (dd, 1H); 7.4 (d, 1H).
Example 9A
Ethyl 6-fluoro-8-hydroxy-2-methylimidazo[1,2-a]pyridine-3-carboxylate 




3.2 g of 2-amino-5-fluoropyridin-3-ol (Example 8A; 25 mmol, 1 equivalent) were initially charged in 155 ml of ethanol, 1.5 g of powdered molecular sieve 3 Å and 20.6 g of ethyl 2-chloroacetoacetate (125 mmol, 5 equivalents) were added and the mixture was boiled at reflux overnight. The reaction solution was concentrated and chromatographed (Biotage Isolera Four; SNAP Cartridge KP-Sil 50 g; cyclohexane/ethyl acetate gradient; then dichloromethane/methanol gradient). The crude product was partly dissolved in a little methanol, and tert-butyl methyl ether was added. The solid was filtered off and washed with tert-butyl methyl ether. This gave 570 mg (10% of theory) of the title compound.
LC-MS (Method 2): Rt=0.77 min
MS (ESpos): m/z=239.2 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.39 (t, 3H); 2.64 (s, 3H); 4.40 (q, 2H); 7.20 (br. d, 1H); 8.9 (dd, 1H); 12.5 (br. s, 1H).
Example 10A
Ethyl 8-[(2,6-difluorobenzyl)oxy]-6-fluoro-2-methylimidazo[1,2-a]pyridine-3-carboxylate




560 mg of ethyl 6-fluoro-8-hydroxy-2-methylimidazo[1,2-a]pyridine-3-carboxylate (Example 9A; 2.4 mmol, 1.0 equivalent), 1.7 g of caesium carbonate (5.17 mmol, 2.2 equivalents) and 535 mg of 2,6-difluorobenzyl bromide (2.6 mmol, 1.1 equivalents) were initially charged in 34 ml of dry DMF, and the mixture was heated at 50° C. for 15 min. Water was added, the mixture was stirred for 30 min and the solid was filtered off and washed with water. This gave 560 mg of the title compound (65% of theory).
LC-MS (Method 2): Rt=1.18 min
MS (ESpos): m/z=365.1 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.37 (t, 3H); 2.55 (s, 3H; superimposed by DMSO signal); 4.38 (q, 2H); 5.89 (s, 2H); 7.23 (t, 2H); 7.44 (dd, 1H); 7.60 (q, 1H); 8.90 (dd, 1H).
Example 11A
8-[(2,6-Difluorobenzyl)oxy]-6-fluoro-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid




550 mg of ethyl 8-[(2,6-difluorobenzyl)oxy]-6-fluoro-2-methylimidazo[1,2-a]pyridine-3-carboxylate (Example 10A; 1.5 mmol, 1 equivalent) were dissolved in 64 ml of THF and 12 ml of methanol, 7.5 ml of 1 N aqueous lithium hydroxide solution were added and the mixture was stirred at RT overnight. 8 ml of 1 N aqueous hydrochloric acid were then added, and the mixture was concentrated under reduced pressure. The solid formed was filtered off and washed with water. This gave 429 mg of the title compound (80% of theory).
LC-MS (Method 1): Rt=0.90 min
MS (ESpos): m/z=337.1 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=2.54 (s, 3H; superimposed by DMSO signal); 5.84 (s, 2H); 7.23 (t, 2H); 7.40 (dd, 1H); 7.51 (q, 1H); 8.92 (dd, 1H); 13.28 (br. s, 1H).
Example 12A
5-Chloro-2-nitropyridin-3-ol




With ice cooling, 30 g of 5-chloropyridin-3-ol (232 mmol, 1 equivalent) were dissolved in 228 ml of concentrated sulphuric acid, and, at 0° C., 24 ml of concentrated nitric acid were added slowly. The reaction was warmed to RT, stirred overnight and then stirred into an ice/water mixture and stirred for another 30 min. The solid was filtered off, washed with cold water and air-dried. This gave 33 g (82% of theory) of the title compound, which were used without further purification for the next reaction.
LC-MS (Method 2): Rt=0.60 min
MS (ESneg): m/z=172.9/174.9 (M−H)−
1H NMR (400 MHz, DMSO-d6): δ=7.71 (d, 1H); 8.10 (d, 1H); 12.14 (br. 1H).
Example 13A
5-Chloro-3-[(2,6-difluorobenzyl)oxy]-2-nitropyridine




33 g of 5-chloro-2-nitropyridin-3-ol (Example 12A; 189 mmol, 1 equivalent) and 61.6 g of caesium carbonate (189 mmol, 1 equivalent) were initially charged in 528 ml of DMF, 40.4 g of 2,6-difluorobenzyl bromide (189 mmol, 1 equivalent) were added and the mixture was stirred at RT overnight. The reaction mixture was stirred into water/1N aqueous hydrochloric acid. The solid was filtered off, washed with water and air-dried. This gave 54.9 g (97% of theory) of the title compound.
1H NMR (400 MHz, DMSO-d6): δ=5.46 (s, 2H); 7.22 (t, 2H); 7.58 (q, 1H); 8.28 (d, 1H); 8.47 (d, 1H).
Example 14A
5-Chloro-3-[(2,6-difluorobenzyl)oxy]pyridine-2-amine




59.7 g of 5-chloro-3-[(2,6-difluorobenzyl)oxy]-2-nitropyridine (Example 13A; 199 mmol, 1 equivalent) were initially charged in 600 ml of ethanol, 34.4 g of iron powder (616 mmol, 3.1 equivalents) were added and the mixture was heated to reflux. 152 ml of concentrated hydrochloric acid were slowly added dropwise and the mixture was boiled at reflux for a further 30 min. The reaction mixture was cooled and stirred into an ice/water mixture. The resulting mixture was adjusted to pH 5 using sodium acetate. The solid was filtered off, washed with water and air-dried and then dried under reduced pressure at 50° C. This gave 52.7 g (98% of theory) of the title compound.
LC-MS (Method 2): Rt=0.93 min
MS (ESpos): m/z=271.1/273.1 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=5.14 (s, 2H); 5.82 (br. s, 2H); 7.20 (t, 2H); 7.35 (d, 1H); 7.55 (q, 1H); 7.56 (d, 1H).
Example 15A
Ethyl 6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylate 




40 g of 5-chloro-3-[(2,6-difluorobenzyl)oxy]pyridine-2-amine (Example 14A; 147.8 mmol; 1 equivalent) were initially charged in 800 ml of ethanol, 30 g of powdered molecular sieve 3 Å and 128 g of ethyl 2-chloroacetoacetate (739 mmol, 5 equivalents) were added and the mixture was heated at reflux overnight. The reaction mixture was concentrated and the residue was taken up in ethyl acetate and filtered. The ethyl acetate phase was washed with water, dried, filtered and concentrated. This gave 44 g (78% of theory) of the title compound.
LC-MS (Method 2): Rt=1.27 min
MS (ESpos): m/z=381.2/383.2 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.36 (t, 3H); 2.54 (s, 3H; obscured by DMSO signal); 4.37 (q, 2H); 5.36 (s, 2H); 7.26 (t, 2H); 7.38 (d, 1H); 7.62 (q, 1H); 8.92 (d, 1H).
Example 16A
6-Chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid




44 g of ethyl 6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylate (Example 15A; 115 mmol, 1 equivalent) were dissolved in 550 ml of THF and 700 ml of methanol, 13.8 g of lithium hydroxide (dissolved in 150 ml of water; 577 mmol, 5 equivalents) were added and the mixture was stirred at RT overnight. 1 N aqueous hydrochloric acid was added and the mixture was concentrated under reduced pressure. The solid obtained was filtered off and washed with water. This gave 34 g of the title compound (84% of theory).
LC-MS (Method 1): Rt=1.03 min
MS (ESpos): m/z=353.0/355.0 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=2.54 (s, 3H; superimposed by DMSO signal); 5.36 (s, 2H); 7.26 (t, 2H); 7.34 (d, 1H); 7.61 (q, 1H); 8.99 (d, 1H); 13.36 (br. s, 1H).
Example 17A
5-Bromo-3-[(2,6-difluorobenzyl)oxy]pyridine-2-amine




32.6 g of 3-[(2,6-difluorobenzyl)oxy]pyridine-2-amine (Example 1A; 138 mmol, 1 equivalent) were suspended in 552 ml of 10% strength sulphuric acid, and the mixture was cooled to 0° C. 8.5 ml of bromine (165 mmol, 1.2 equivalents) were dissolved in 85 ml of acetic acid and then, over a period of 90 min, added dropwise to the ice-cooled reaction solution. After the dropwise addition had ended, the mixture was stirred at 0° C. for 90 min and then diluted with 600 ml of ethyl acetate, and the aqueous phase was separated off. The aqueous phase was extracted with ethyl acetate. The organic phases were combined, washed with saturated aqueous sodium bicarbonate solution, dried and concentrated. The residue was dissolved in dichloromethane and chromatographed on silica gel (petroleum ether/ethyl acetate gradient as mobile phase). This gave 24 g (55% of theory) of the title compound.
LC-MS (Method 2): Rt=0.96 min
MS (ESpos): m/z=315.1/317.1 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=5.14 (s, 2H); 5.83 (br. s, 2H); 7.20 (t, 2H); 7.42 (d, 1H); 7.54 (q, 1H); 7.62 (d, 1H).
Example 18A
Ethyl 6-bromo-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylate




16 g of powdered molecular sieve 3 Å and 52.7 ml of ethyl 2-chloroacetoacetate (380.8 mmol; 5 equivalents) were added to 24 g of 5-bromo-3-[(2,6-difluorobenzyl)oxy]pyridine-2-amine (Example 17A; 76.2 mmol; 1 equivalent) in 400 ml of ethanol, and the mixture was heated at reflux overnight. A further 8 g of molecular sieve were added, and the mixture was heated at reflux for a further 24 h. The reaction mixture was concentrated under reduced pressure and the residue was taken up in dichloromethane and chromatographed on silica gel (dichloromethane/methanol 20:1 as mobile phase). The product-containing fractions were concentrated and the residue was stirred with 100 ml of diethyl ether for 30 min. The product was then filtered off, washed with a little diethyl ether and dried. This gave 15 g (45% of theory) of the title compound.
LC-MS (Method 1): Rt=1.43 min
MS (ESpos): m/z=414.9/416.8 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.36 (t, 3H); 2.54 (s, 3H; obscured by DMSO signal); 4.37 (q, 2H); 5.36 (s, 2H); 7.25 (t, 2H); 7.42 (d, 1H); 7.61 (q, 1H); 9.00 (d, 1H).
Example 19A
6-Bromo-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid 




1.5 g of ethyl 6-bromo-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylate (Example 18A; 3.5 mmol, 1 equivalent) were dissolved in 72 ml of THF/methanol 5:1, 17.6 ml of 1N aqueous lithium hydroxide solution (17.6 mmol, 5 equivalents) were added and the mixture was warmed to 40° C. and stirred at this temperature for 6 h. Using 6 N aqueous hydrochloric acid, the mixture was then adjusted to pH 4 and concentrated under reduced pressure. Water was added to the solid formed and the solid was triturated, filtered off, washed with water and dried under reduced pressure. This gave 1.24 g of the title compound (88% of theory).
LC-MS (Method 2): Rt=0.93 min
MS (ESpos): m/z=397.0/399.1 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=2.54 (s, 3H; superimposed by DMSO signal); 5.36 (s, 2H); 7.25 (t, 2H); 7.40 (d, 1H); 7.61 (q, 1H); 9.06 (d, 1H); 13.35 (br. s, 1H).
Example 20A
Ethyl 8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylate




20.00 g (85.38 mmol) of ethyl 8-hydroxy-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylate from Example 239A, 19.44 g (93.91 mmol) of 2,6-difluorobenzyl bromide and 61.20 g (187.83 mmol) of caesium carbonate in 1.18 l of DMF were stirred at 60° C. for 5 h. The reaction mixture was then poured into 6.4 l of 10% strength aqueous sodium chloride solution and then extracted twice with ethyl acetate. The combined organic phases were washed with 854 ml of 10% strength aqueous sodium chloride solution, dried, concentrated and dried under high vacuum at RT overnight. This gave 28.2 g (92% of theory; purity about 90%) of the title compound.
LC-MS (Method 2): Rt=1.05 min
MS (ESpos): m/z=361.1 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.38 (t, 3H); 2.36 (s, 3H); 4.35 (q, 2H); 5.30 (s, 2H); 7.10 (s, 1H); 7.23 (t, 2H); 7.59 (q, 1H); 8.70 (s, 1H).
Example 21A
8-[(2,6-Difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylic acid




220 mg of ethyl 8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylate (Example 20A; 0.524 mmol, 1 equivalent) were dissolved in 7 ml of THF/methanol 1:1, 2.6 ml of 1 N aqueous lithium hydroxide solution (2.6 mmol, 5 equivalents) were added and the mixture was stirred at RT for 16 h. The mixture was concentrated under reduced pressure and the residue was acidified with 1N aqueous hydrochloric acid and stirred for 15 min. The solid was filtered off, washed with water and dried under reduced pressure. This gave 120 mg of the title compound (60% of theory).
LC-MS (Method 2): Rt=0.68 min
MS (ESpos): m/z=333.1 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=2.34 (s, 3H); 5.28 (s, 2H); 7.09 (s, 1H); 7.23 (t, 2H); 7.58 (q, 1H); 8.76 (s, 1H); 13.1 (br. s, 1H), [further signal hidden under DMSO signal].
Example 22A
8-[(2,6-Difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carbonyl chloride hydrochloride




4 drops of DMF were added to 2.0 g of 8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxylic acid (6.28 mmol, 1 equivalent) in 25 ml of dry THF, followed by the dropwise addition of 3.19 g of oxalyl chloride (25.14 mmol, 4 equivalents). The reaction mixture was stirred at RT for 3 h. Another 0.80 g of oxalyl chloride (6.28 mmol, 1 equivalent) were added, and the reaction was stirred at RT for a further 4 h. The reaction mixture was concentrated and co-evaporated with toluene three times, and the residue was dried under high vacuum. This gave 2.43 g of the title compound (103% of theory).
DCI-MS (Method 4): MS (ESpos): m/z=437 (M−HCl+H)+
Example 23A
Ethyl 2-chloro-3-cyclopropyl-3-oxopropanoate




3.1 ml of sulphuryl chloride (38.2 mmol, 1.05 equivalents) were initially charged in 21 ml of dichloromethane, and 5.68 g of ethyl 3-cyclopropyl-3-oxopropanoate (36.4 mmol) were added dropwise on a water bath. The reaction mixture was stirred at RT for 2 h. The mixture was then washed with water, 5% strength aqueous sodium bicarbonate solution and saturated aqueous sodium chloride solution, dried over magnesium sulphate and concentrated. The crude product (6.8 g) was used without further purification for the next reaction.
Example 24A
Ethyl 2-cyclopropyl-8-[(2,6-difluorobenzyl)oxy]imidazo[1,2-a]pyridine-3-carboxylate




1.69 g of 3-[(2,6-difluorobenzyl)oxy]pyridine-2-amine (Example 1A; 7.13 mmol, 1 equivalent) were initially charged in 44.4 ml of ethanol, and 425 mg of powdered molecular sieve 3 Å and 6.8 g of ethyl 2-chloro-3-cyclopropyl-3-oxopropanoate (crude product from Example 23A) were added. The reaction mixture was heated at reflux for 48 h and then concentrated under reduced pressure, and the residue was chromatographed (cyclohexane/ethyl acetate as mobile phase). The product-containing fractions were combined and concentrated under reduced pressure. The residue obtained in this manner was taken up in methanol, DMSO and water. The solid obtained was filtered off and dried under high vacuum. This gave 410 mg (15.4% of theory) of the title compound.
LC-MS (Method 2): Rt=1.22 min
MS (ESpos): m/z=373.2 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.95-1.05 (m, 4H); 1.39 (t, 3H); 2.36 (s, 3H); 2.70-2.80 (m, 1H); 4.39 (q, 2H); 5.30 (s, 2H); 7.08 (t, 1H); 7.15 (d, 1H); 7.20 (t, 2H); 7.59 (q, 1H); 8.88 (d, 1H).
Example 25A
2-Cyclopropyl-8-[(2,6-difluorobenzyl)oxy]imidazo[1,2-a]pyridine-3-carboxylic acid 




410 mg of ethyl 2-cyclopropyl-8-[(2,6-difluorobenzyl)oxy]imidazo[1,2-a]pyridine-3-carboxylate (Example 24A, 1.1 mmol, 1 equivalent) were initially charged in 15 ml of methanol/THF (1:1), and 5.5 ml of a 1 N aqueous lithium hydroxide solution (5.5 mmol, 5 equivalents) were added. The reaction mixture was stirred at RT overnight. Another 5.5 ml of 1 N aqueous lithium hydroxide solution were added, and the mixture was stirred at RT for another night. The mixture was then concentrated under reduced pressure and the residue was taken up in water and acidified with 1 N aqueous hydrochloric acid. The precipitated product was filtered off and dried under high vacuum. This gave 293 mg (77% of theory) of the title compound.
LC-MS (Method 2): Rt=0.83 min
MS (ESpos): m/z=345.2 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.95-1.02 (m, 4H); 2.80 (q, 1H); 5.30 (s, 2H); 7.02 (t, 1H); 7.15 (d, 1H); 7.22 (t, 2H); 7.59 (q, 1H); 8.92 (s, 1H); 13.3 (br. s, 1H).
Example 26A
Ethyl 2-chloro-3-oxopropanoate




139 ml of a 21% strength solution of sodium ethoxide in ethanol (371 mmol, 0.91 equivalent) were initially charged in 200 ml of diethyl ether, and a solution of 43.7 ml of ethyl chloroacetate (408 mmol, 1 equivalent) and 32.9 ml of ethyl formate (408 mmol, 1 equivalent) in 150 ml of diethyl ether was added dropwise at RT. The reaction mixture was stirred overnight and the solid was filtered off and washed with diethyl ether. The solid was dissolved in water and the aqueous phase was, with ice bath cooling, adjusted to pH4 using concentrated hydrochloric acid. The mixture was extracted repeatedly with diethyl ether and the combined organic phases were washed with saturated aqueous sodium chloride solution, dried with magnesium sulphate, filtered and concentrated. The crude product obtained (8.2 g) was freed from residual solvent under high vacuum and used without further purification for the next reaction.
Example 27A
Ethyl 8-[(2,6-difluorobenzyl)oxy]imidazo[1,2-a]pyridine-3-carboxylate




1.93 g of 3-[(2,6-difluorobenzyl)oxy]pyridine-2-amine (Example 1A; 8.2 mmol, 1 equivalent) were initially charged in 50 ml of ethanol, and 8.2 g of ethyl 2-chloro-3-oxopropanoate (75% pure, crude product from Example 26A, 40.8 mmol, 5 equivalents) were added. The reaction mixture was heated at reflux overnight. The mixture was then concentrated under reduced pressure and the crude product obtained was chromatographed on 340 g of silica gel (Biotage Isolera) (mobile phase: cyclohexane:ethyl acetate gradient; Rf value of the product in cyclohexane:ethyl acetate 2:1=0.36). The product fractions were combined and concentrated and the residue obtained was triturated with diisopropyl ether. The solid was filtered off and dried under high vacuum. This gave 2.02 g of the title compound (71% of theory).
LC-MS (Method 2): Rt=1.08 min
MS (ESpos): m/z=333.1 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.35 (t, 3H); 4.39 (q, 2H); 5.35 (s, 2H); 7.15-7.28 (m, 4H); 7.58 (q, 1H); 8.18 (s, 1H); 8.90 (d, 1H).
Example 28A
8-[(2,6-Difluorobenzyl)oxy]imidazo[1,2-a]pyridine-3-carboxylic acid




1 of ethyl 8-[(2,6-difluorobenzyl)oxy]imidazo[1,2-a]pyridine-3-carboxylate (Example 27A, 3 mmol, 1 equivalent) were initially charged in 60 ml of methanol/THF (5:1), 15 ml of a 1 N aqueous lithium hydroxide solution (15 mmol, 5 equivalents) were added and the mixture was warmed to 40° C. and stirred at this temperature for 4 h. The mixture was then cooled and, with ice cooling, adjusted to pH 4 using 6 N aqueous hydrochloric acid. The organic solvents were removed on a rotary evaporator, water was added to the precipitated product and the product was filtered, washed with water and dried under high vacuum. This gave 797 mg (87% of theory) of the title compound.
LC-MS (Method 2): Rt=0.66 min
MS (ESpos): m/z=305.1 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=5.38 (s, 2H); 7.10-7.28 (m, 4H); 7.59 (q, 1H); 8.12 (s, 1H); 8.92 (s, 1H); 13.1 (br. s, 1H).
Example 29A
Ethyl 8-(benzyloxy)-2-methylimidazo[1,2-a]pyridine-3-carboxylate 




25 g of 2-amino-3-benzyloxypyridine (124.8 mmol, 1 equivalent) were dissolved in 781 ml of ethanol, and 102.7 g of ethyl 2-chloroacetoacetate (624.2 mmol, 5 equivalents) and 15 g of 4 Å molecular sieve were added. The mixture was heated at reflux for 2 d (bath temperature 100° C.). The mixture was then concentrated and excess ethyl 2-chloroacetoacetate was distilled off on a rotary evaporator with dry ice-cooling. The residue was purified by silica gel chromatography (mobile phase cyclohexane:ethyl acetate 9:1, 4:1). This gave 20.81 g of the title compound (54% of theory).
LC-MS (Method 1): Rt=1.12 min
MS (ESpos): m/z=311 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.35 (t, 3H), 2.59 (s, 3H), 4.34 (q, 2H), 5.32 (s, 2H), 7.01-7.09 (m, 2H), 7.33-7.48 (m, 3H), 7.52 (d, 2H), 8.81-8.86 (m, 1H).
Example 30A
8-(Benzyloxy)-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid




253 ml of 2 N aqueous sodium hydroxide solution were added to a solution of 15.7 g of ethyl 8-(benzyloxy)-2-methylimidazo[1,2-a]pyridine-3-carboxylate (50.59 mmol) in 253 ml of 1,4-dioxane, and the mixture was stirred at RT for 14 h. 101 ml of 6 N aqueous hydrochloric acid were then added. The solid formed was filtered off, washed with water and methyl tert-butyl ether and then dried under reduced pressure at 40° C. overnight. This gave 15.49 g (108% of theory) of 8-(benzyloxy)-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid.
LC-MS (Method 1): Rt=0.66 min
MS (ESpos): m/z=283.0 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=2.67 (s, 3H), 3.2-3.8 (very broad water peak), 5.41 (s, 2H), 7.30 (m, 1H), 7.35-7.48 (m, 4H), 7.57 (d, 2H), 9.02 (d, 1H).
Example 31A rac-2-Amino-4,4,4-trifluorobutan-1-ol




0.32 ml of lithium borohydride (2 M in THF, 0.65 mmol, 2.5 equivalents) were initially charged in 0.5 ml of abs. THF, 0.16 ml of chlorotrimethylsilane (1.28 mmol, 5 equivalents) were added at RT and the mixture was stirred at RT for 5 min. 50 mg of 2-amino-4,4,4-trifluorobutanoic acid hydrochloride (0.26 mmol, 1 equivalent) were then added a little at a time, and the reaction mixture was stirred at RT overnight. 0.5 ml of methanol was added, and the mixture was then concentrated. 0.6 ml of a 20% strength solution of potassium hydroxide was then added, and the mixture was extracted three times with dichloromethane. The combined organic phases were dried over sodium sulphate, filtered and concentrated. This gave 33 mg of the title compound (88% of theory).
DCI-MS (Method 4): MS (ESpos): m/z=144 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=2.08-2.20 (m, 1H), 2.22-2.38 (m, 1H), 3.25-3.32 (m, 1H), 3.39-3.44 (m, 1H), 3.59-3.65 (m, 1H).
The examples shown in Table 1A were prepared analogously to Example 31A by reacting lithium borohydride (1.7-2.5 equivalents) and chlorotrimethylsilane (3.4-5 equivalents) with the appropriate commercially available amino acids according to General Working Procedure 1:









TABLE 1A





Exam-
IUPAC name/structure



ple
(yield)
Analytical data







32A




DCI-MS (Method 4): MS (ESpos): m/z = 172 (M + H)+


 


33A




DCI-MS (Method 4): MS (ESpos): m/z = 226 (M + H)+









Example 34A
rac-8-[(2,6-Difluorobenzyl)oxy]-2-methyl-N-(4,4,4-trifluoro-1-hydroxybutan-2-yl)imidazo[1,2-a]-pyridine-3-carboxamide




330 mg of 8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid (1.04 mmol), 399 mg of (benzotriazol-1-yloxy)bisdimethylaminomethylium fluoroborate (TBTU, 1.24 mmol) and 524 mg of 4-methylmorpholine (5.18 mmol) were initially charged in 6.6 ml of DMF. After 10 min at RT, 371 mg (1.56 mmol, purity about 60%) of 2-amino-4,4,4-trifluorobutan-1-ol (Example 31A) were added and the mixture was stirred at RT overnight. About 200 ml of water were added, the reaction solution was stirred for another 30 min and the precipitate formed was filtered off, washed with water and dried under high vacuum overnight. This gave 439 mg of the title compound (96% of theory).
LC-MS (Method 5): Rt=1.62 min
MS (ESpos): m/z=444 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=2.50 (s, 3H), 2.55-2.72 (m, 2H), 3.38-3.47 (m, 1H), 3.51-3.62 (m, 1H), 4.29-4.40 (m, 1H), 5.12 (t, 1H), 5.30 (s, 2H), 6.92 (t, 1H), 7.02 (d, 1H), 7.23 (t, 2H), 7.59 (quint, 1H), 7.80 (d, 1H), 8.56 (d, 1H).
The examples shown in Table 2A were prepared analogously to Example 34A by reacting 8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid with the appropriate commercially available amines under the reaction conditions described in the General Working Procedure 2:









TABLE 2A





Exam-
IUPAC name/structure 



ple
(yield)
Analytical data







35A




LC-MS (Method 2): Rt = 0.88 min MS (ESpos): m/z = 472 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ =  1.51-1.79 (m, 4H), 2.19-2.40 (m, 2H), 2.50 (s, 3H), 3.41-3.57 (m, 2H), 3.96- 4.08 (m, 1H), 4.82 (t, 1H), 5.30 (s, 2H), 6.91 (t, 1H), 6.99 (d, 1H), 7.22 (t, 2H), 7.56-7.62 (m, 2H), 8.52 (d, 1H).


 


36A




LC-MS (Method 2): Rt = 0.90 min MS (ESpos): m/z = 526 (M − TFA + H)+ 





a) Alternative work-up: The crude reaction mixture was purified directly by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA).






Example 37A
rac-N-(1-Chloro-4,4,4-trifluorobutan-2-yl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide hydrochloride




2.48 g of rac-8-[(2,6-difluorobenzyl)oxy]-2-methyl-N-(4,4,4-trifluoro-1-hydroxybutan-2-yl)-imidazo-[1,2-a]pyridine-3-carboxamide (Example 34A, 5.59 mmol) were initially charged in dichloromethane. At 0° C., 1.22 ml of thionyl chloride (16.77 mmol) were added dropwise, and the mixture was stirred at RT overnight. The reaction solution was concentrated and dried under high vacuum. This gave 2.78 g of the title compound (99.8% of theory).
LC-MS (Method 2): Rt=0.94 min
MS (ESpos): m/z=462 (M−HCl+H)+
1H NMR (400 MHz, DMSO-d6): δ=2.60 (s, 3H), 2.70-2.84 (m, 2H), 3.82-3.92 (m, 2H), 4.55-4.67 (m, 1H), 5.43 (s, 2H), 7.23 (t, 2H), 7.31-7.43 (m, 1H), 7.51-7.66 (m, 2H), 8.63 (d, 1H), 8.82 (br s, 1H).
The examples shown in Table 3A were prepared analogously to Example 37A.









TABLE 3A





Exam-
IUPAC name/structure



ple
(yield)
Analytical data







38A




LC-MS (Method 2): Rt = 1.05 min MS (ESpos): m/z = 490 (M − HCl + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.52-1.81 (m, 4H), 2.20-2.42 (m, 2H), 2.60 (s, 3H), 3.72-3.87 (m, 2H), 4.21- 4.33 (m, 1H), 5.45 (s, 2H), 7.23 (t, 2H), 7.40 (br s, 1H), 7.52-7.68 (m, 2H), 8.54 (br s, 1H), 8.61 (d, 1H).


 


39A




LC-MS (Method 2): Rt = 1.15 min MS (ESpos): m/z = 544 (M − HCl + H)+


 


40A




LC-MS (Method 2): Rt = 1.06 min MS (ESpos): m/z = 436 (M − HCl + H)+









Example 41A
rac-N-(1-Azido-4,4,4-trifluorobutan-2-yl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide




195 mg of rac-N-(1-chloro-4,4,4-trifluorobutan-2-yl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide hydrochloride (Example 37A, 0.39 mmol) were initially charged in 3.4 ml of DMF, 254 mg of sodium azide (3.91 mmol) were added and the mixture was stirred at 40° C. for 4 h. The mixture was then stirred at 60° C. for 5 h. Water was added, and the reaction mixture was extracted three times with ethyl acetate. The combined organic phases were dried over sodium sulphate and filtered, the filtrate was concentrated and the residue was purified by silica gel chromatography (mobile phase: cyclohexane:ethyl acetate 7:3, isocratic). This gave 50 mg of the title compound (27% of theory).
LC-MS (Method 2): Rt=0.97 min
MS (ESpos): m/z=469 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=2.50 (s, 3H), 2.58-2.78 (m, 2H), 3.52-3.63 (m, 2H), 4.47-4.58 (m, 1H), 5.30 (s, 2H), 6.93 (t, 1H), 7.02 (d, 1H), 7.22 (t, 2H), 7.59 (quint, 1H), 8.09 (d, 1H), 8.55 (d, 1H).
The examples shown in Table 4A were prepared analogously to Example 41A by reacting sodium azide (5-20 equivalents) with the appropriate chlorides. The crude products were purified by silica gel chromatography (mobile phase: cyclohexane:ethyl acetate gradient or isocratic).









TABLE 4A





Exam-
IUPAC name/structure



ple
(yield)
Analytical data







42A
rac-N-(1-azido-6,6,6-trifluorohexan-2-yl)-8- [(2,6-difluorobenzyl)oxy]-2-methylimidazo [1,2-a]pyridine-3-carboxamide a)   


   (25% of theory)
LC-MS (Method 2): Rt = 1.03 min MS (ESpos): m/z = 497 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.52-1.70 (m, 4H), 2.20-2.41 (m, 2H), 2.50 (s, 3H), 3.52 (d, 2H), 4.18-4.26 (m, 1H), 5.30 (s, 2H), 6.93 (t, 1H), 7.01 (d, 1H), 7.23 (t, 2H), 7.59 (quint, 1H), 7.91 (d, 1H), 8.50 (d, 1H).


 


43A
rac-N-[1-azido-5,5,5-trifluoro-4- (trifluoromethyl)pentan-2-yl]-8-[(2,6- difluorobenzyl)oxy]-2-methylimidazo[1,2-a]- pyridine-3-carboxamide   


   (45% of theory)
LC-MS (Method 2): Rt = 1.08 min MS (ESpos): m/z = 551 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 2.06-2.19 (m, 2H), 2.52 (s, 3H), 3.61 (d, 2H), 3.98-4.13 (m, 1H), 4.26- 4.38 (m, 1H), 5.30 (s, 2H), 6.94 (t, 1H), 7.03 (d, 1H), 7.23 (t, 2H), 7.59 (quint, 1H), 7.89 (d, 1H), 8.59 (d, 1H).


 


44A
ent-N-[(2R)-1-azidohexan-2-yl]-8-[(2,6- difluorobenzyl)oxy]-2-methylimidazo[1,2-a]- pyridine-3-carboxamide   


   (37% of theory)
LC-MS (Method 2): Rt = 1.04 min MS (ESpos): m/z = 443 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 0.88 (t, 3H), 1.22-1.42 (m, 4H), 1.49-1.61 (m, 2H), 2.50 (s, 3H), 3.48 (d, 2H), 4.10-4.21 (m, 1H), 5.30 (s, 2H), 6.93 (t, 1H), 6.99 (d, 1H), 7.23 (t, 2H), 7.59 (quint, 1H), 7.88 (d, 1H), 8.50 (d, 1H).





a) 20 equivalents of sodium azide were used.






Example 45A
rac-tert-Butyl [2-(4-chlorophenyl)-2-hydroxyethyl]carbamate




First, 2.43 g of triethylamine (24.03 mmol) and then 2.35 g of di-tert-butyl dicarbonate (10.76 mmol) were added to 2.0 g of rac-2-amino-1-(4-chlorophenyl)ethanol hydrochloride (9.61 mmol) in 14 ml of dichloromethane. The reaction mixture was stirred at RT for 2 h. The mixture was diluted with dichloromethane, washed with saturated aqueous sodium bicarbonate solution and with saturated aqueous sodium chloride solution, dried over sodium sulphate, filtered, concentrated under reduced pressure and dried under high vacuum. This gave 2.72 g of the title compound (104% of theory).
LC-MS (Method 2): Rt=0.97 min
MS (ESneg): m/z=272 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.33 (s, 9H), 2.97-3.13 (m, 2H), 4.54-4.62 (m, 1H), 5.44 (d, 1H), 6.73 (t, 1H), 7.31 (d, 2H), 7.38 (d, 2H).
The example shown in Table 5A was prepared analogously to Example 45A by reacting di-tert-butyl dicarbonate in dichloromethane with the appropriate commercially available amine.









TABLE 5A





Exam-
IUPAC name/structure



ple
(yield)
Analytical data







46A
rac-tert-butyl (2-hydroxy-2- phenylethyl)carbamate   


   (104% of theory)
LC-MS (Method 4): MS (ESpos): m/z = 272 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.33 (s, 9H), 2.97-3.13 (m, 2H), 4.54-4.62 (m, 1H), 5.44 (d, 1H), 6.73 (t, 1H), 7.19-7.38 (d, 2H).









Example 47A
rac-3-(1,3-Dioxo-1,3-dihydro-2H-isoindol-2-yl)-3-(4-fluorophenyl)propanoic acid




2.0 g of rac-3-amino-3-(4-fluorophenyl)propanoic acid (10.92 mmol) and 1.62 g of phthalic anhydride (10.92 mmol) were dissolved in 9 ml of DMF and heated at reflux at 135° C. overnight. The reaction solution was added to about 200 ml of water. The solid formed was stirred at RT for about 30 min and then filtered off, washed with water and dried under high vacuum. This gave 3.43 g of the title compound (86% of theory, purity about 86%).
LC-MS (Method 1): Rt=1.09 min
MS (ESpos): m/z=314 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=3.24-3.3.34 (m, 1H), 3.44-3.53 (m, 1H), 5.63-5.70 (m, 1H), 7.18 (t, 2H), 7.48 (dd, 1H), 7.82-7.90 (m, 4H), 12.48 (br s, 1H).
Example 48A
rac-3-(3,4-Difluorophenyl)-3-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)propanoic acid




Step 1:

Under argon, 697 g of 3,4-difluorobenzaldehyde (4.76 mol, 1 equivalent), 495 g of malonic acid (4.76 mol, 1 equivalent) and 733 g of ammonium acetate (9.52 mol, 2 equivalents) were stirred at reflux in 2788 ml of ethanol for 20 h. The mixture was then cooled to RT and stirred at RT overnight. The precipitated crystals were filtered off with suction, washed with ethanol and diethyl ether and dried under reduced pressure. This gave 590 g (62% of theory) of rac-3-amino-3-(3,4-difluorophenyl)propanoic acid.
rac-3-Amino-3-(3,4-difluorophenyl)propanoic acid
LC-MS (Method 1): Rt=0.27 min
MS (ESpos): m/z=202.0 (M+H)+
Step 2:
0.20 g (0.99 mmol) of rac-3-amino-3-(3,4-difluorophenyl)propanoic acid and 0.15 g (0.99 mmol) of phthalic anhydride were dissolved in 0.8 ml of DMF and heated at reflux at 135° C. overnight. The reaction solution was added to about 9 ml of water. The resulting suspension was extracted twice with ethyl acetate. The combined organic phases were washed with water, dried over sodium sulphate, filtered and concentrated. The crude product was purified by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). This gave 0.2 g of the title compound (61% of theory).
LC-MS (Method 2): Rt=0.97 min
MS (ESpos): m/z=332 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=3.24-3.3.33 (m, 1H), 3.44-3.52 (m, 1H), 5.63-5.70 (m, 1H), 7.23-7.28 (m, 1H), 7.36-7.47 (m, 1H), 7.49-7.57 (m, 1H), 7.82-7.90 (m, 4H), 12.51 (br s, 1H).
Example 49A
rac-3-(2,4-Difluorophenyl)-3-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)propanoic acid




5.0 g of rac-3-amino-3-(2,4-difluorophenyl)propanoic acid (24.85 mmol) and 3.68 g of phthalic anhydride (24.85 mmol) were dissolved in 20 ml of DMF and the mixture was heated at reflux at 135° C. overnight. The reaction solution was added to about 160 ml of water and extracted twice with ethyl acetate. The combined organic phases were washed with water, dried over sodium sulphate, filtered and concentrated. The crude product was purified by silica gel chromatography (mobile phase: dichloromethane/methanol 80:1, isocratic) and then by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). This gave 3.43 g of the title compound (27% of theory).
LC-MS (Method 1): Rt=1.11 min
MS (ESpos): m/z=332 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=3.24-3.3.34 (m, 1H), 3.40-3.49 (m, 1H), 5.89 (t, 1H), 7.09-7.15 (m, 1H), 7.19-7.28 (m, 1H), 7.70 (q, 1H), 7.82-7.89 (m, 4H), 12.55 (br s, 1H).
Example 50A
rac-tert-Butyl [2-(4-chlorophenyl)-2-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)ethyl]carbamate




At RT, 2.61 g of rac-tert-butyl [2-(4-chlorophenyl)-2-hydroxyethyl]carbamate (Example 45A, 9.62 mmol), 1.42 g of phthalimide (9.62 mmol) and 3.78 g of triphenylphosphine (14.43 mmol) were initially charged in abs. THF. 4.03 g (14.43 mmol) of diisopropyl azodicarboxylate were then added dropwise, and the mixture was stirred at RT for 30 min. The reaction mixture was concentrated and purified by silica gel chromatography (mobile phase: cyclohexane:ethyl acetate 10:1). This gave 2.92 g of the title compound (55% of theory, purity about 73%).
LC-MS (Method 2): Rt=1.22 min
MS (ESpos): m/z=401 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.26 (s, 9H), 3.70-3.79 (m, 1H), 3.82-3.93 (m, 1H), 5.32-5.38 (m, 1H), 7.22 (t, 1H), 7.38-7.44 (m, 4H), 7.80-7.85 (m, 4H).
The example shown in Table 6A was prepared analogously to Example 50A by reacting phthalimide, triphenylphosphine and diisopropyl azodicarboxylate in THF with the appropriate alcohol.









TABLE 6A





Exam-
IUPAC name/structure



ple
(yield)
Analytical data







51A
rac-tert-butyl [2-(1,3-dioxo-1,3- dihydro-2H-isoindol-2-yl)ethyl]carbamate   


   (55% of theory, purity about 73%)
LC-MS (Method 2): Rt = 1.22 min MS (ESpos): m/z = 401 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.26 (s, 9H), 3.70-3.79 (m, 1H), 3.82-3.93 (m, 1H), 5.32-5.38 (m, 1H), 7.22 (t, 1H), 7.38-7.44 (m, 4H), 7.80- 7.85 (m, 4H).









Example 52A
rac-tert-Butyl [2-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)-2-(4-fluorophenyl)ethyl]carbamate




Under argon, a solution of 3.2 g of rac-3-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)-3-(4-fluorophenyl)propanoic acid (Example 47A, 8.78 mmol) in 32 ml of toluene was initially charged, and 1.33 g of triethylamine (13.18 mmol), 98 mg of 1,4-diazabicyclo[2.2.2]octane (0.88 mmol), 3.14 g of diphenylphosphoryl azide (11.42 mmol) and 6.51 g of tert-butanol (87.84 mmol) were added. The reaction mixture was heated at reflux overnight and then diluted with ethyl acetate and washed with water. The organic phase was dried over sodium sulphate, filtered and concentrated. The crude product was purified by silica gel chromatography (mobile phase: cyclohexane/ethyl acetate 8:1; 6:1). This gave 959 mg of the title compound (28% of theory).
LC-MS (Method 2): Rt=1.11 min
MS (ESpos): m/z=385 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.26 (s, 9H), 3.69-3.78 (m, 1H), 3.84-3.95 (m, 1H), 5.32-5.39 (m, 1H), 7.15-7.26 (m, 3H), 7.41-7.48 (m, 2H), 7.80-7.89 (m, 4H).
Example 53A
rac-tert-Butyl [2-(3,4-difluorophenyl)-2-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)ethyl]carbamate




Under argon, a solution of 5.0 g of rac-3-(3,4-difluorophenyl)-3-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)propanoic acid (Example 48A, 15.09 mmol) and 3.06 g of triethylamine (30.19 mmol) in 65 ml of toluene was initially charged, 4.36 g of diphenylphosphoryl azide (15.85 mmol) were added and the mixture was stirred at RT for 3.5 h. 65 ml of tert-butanol were then added, and the mixture was stirred under reflux overnight. After cooling, the reaction solution was concentrated and purified by flash chromatography (mobile phase: petroleum ether/ethyl acetate 2:1, isocratic). This gave 3.1 g of the title compound (45% of theory).
LC-MS (Method 2): Rt=1.19 min
MS (ESpos): m/z=403 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.26 (s, 9H), 3.73-3.90 (m, 2H), 5.32-5.39 (m, 1H), 7.20-7.27 (m, 2H), 7.36-7.46 (m, 1H), 7.48-7.56 (m, 1H), 7.81-7.91 (m, 4H).
Example 54A
rac-tert-Butyl [2-(2,4-difluorophenyl)-2-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)ethyl]carbamate 




Under argon, 2.17 g of rac-3-(2,4-difluorophenyl)-3-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)-propanoic acid (Example 49A, 6.54 mmol) and 1.32 g of triethylamine (13.07 mmol) were initially charged in 23.8 ml of abs. toluene. 1.89 g of diphenylphosphoryl azide (6.86 mmol) were added at RT, and the mixture was stirred at RT with water cooling for 3.5 h, 23.8 ml of tert-butanol were then added and the mixture was stirred under reflux overnight. After cooling, the reaction solution was concentrated and purified by flash chromatography (mobile phase: cyclohexane/ethyl acetate 2:1). This gave 650 mg of the title compound (24% of theory).
LC-MS (Method 2): Rt=1.11 min
MS (ESpos): m/z=403 (M+H)+
Example 55A
rac-tert-Butyl [2-amino-2-(3,4-difluorophenyl)ethyl]carbamate




6.13 g of rac-tert-butyl [2-(3,4-difluorophenyl)-2-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)ethyl]-carbamate (Example 53A, purity about 60%, about 9.14 mmol) were initially charged in 13.1 ml of 40% strength aqueous methylamine solution and stirred in a closed vessel at 60° C. overnight. The reaction mixture was concentrated and the residue was purified by silica gel chromatography (mobile phase: dichloromethane:methanol:diethylamine 30:1:0.1; 20:1:0.1). This gave 1.83 g of the title compound (74% of theory).
LC-MS (Method 1): Rt=0.65 min
MS (ESpos): m/z=273 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.33 (s, 9H), 1.96 (br s, 2H), 2.92-3.10 (m, 2H), 3.81-3.88 (m, 1H), 6.76-6.82 (m, 1H), 7.11-7.17 (m, 1H), 7.27-7.40 (m, 2H).
The examples shown in Table 7A were prepared analogously to Example 55A by reacting a solution of methylamine with the appropriate phthalimides.









TABLE 7A





Exam-
IUPAC name/structure



ple
(yield)
Analytical data







56A
rac-tert-butyl [2-amino-2-(4- chlorophenyl)ethyl]carbamate trifluoroacetate 1)   


   (41% of theory)
LC-MS (Method 2): Rt = 0.68 min MS (ESpos): m/z = 271 (M + H − TFA)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.31 (s, 9H), 3.28-3.44 (m, 2H), 4.31 (br s, 1H), 7.00 (t, 1H), 7.43 (d, 2H), 7.52 (d, 2H), 8.42 (br s, 3H).


 


57A
rac-tert-butyl (2-amino-2-phenylethyl)carbamate trifluoroacetate 1)   


   (45% of theory)
LC-MS (Method 2): Rt = 0.59 min MS (ESpos): m/z = 237 (M + H − TFA)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.34 (s, 9H), 3.28-3.46 (m, 2H), 4.29 (br s, 1H), 7.01 (t, 1H), 7.35-7.48 (m, 5H), 8.43 (br s, 3H).


 


58A
rac-tert-butyl [2-amino-2-(4- fluorophenyl)ethyl]carbamate 2)   


   (85% of theory)
LC-MS (Method 2): Rt = 0.60 min MS (ESpos): m/z = 255 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.33 (s, 9H), 1.89 (br s, 2H), 2.88- 2.97 (m, 1H), 3.04-3.11 (m, 1H), 3.84- 3.90 (m, 1H), 6.80 (t, 1H), 7.11 (t, 2H), 7.36 (dd, 2H).


 


59A
rac-tert-butyl [2-amino-2-(2,4- difluorophenyl)ethyl]carbamate   


   (86% of theory)
LC-MS (Method 2): Rt = 0.65 min MS (ESpos): m/z = 273 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.31 (s, 9H), 1.91 (br s, 2H), 2.97- 3.14 (m, 2H), 4.12 (t, 1H), 6.81 (t, 1H), 6.99-7.17 (m, 2H), 7.54 (q, 1H).





1) The crude product obtained was concentrated and re-purified by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA).


2) Reaction conditions: 20 eq. of methylamine [40% strength solution in water]; 7 h at 60° C.






Example 60A
ent-tert-Butyl [2-amino-2-(3,4-difluorophenyl)ethyl]carbamate (enantiomer A) 




100 mg of rac-tert-butyl [2-amino-2-(3,4-difluorophenyl)ethyl]carbamate (Example 55A) were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AY-H, 5 μm, 250×20 mm, mobile phase: 80% isohexane, 20% ethanol+0.2% diethylamine, flow rate 15 ml/min; 30° C., detection: 220 nm].
Yield: 43 mg of enantiomer A (99% pure, >99% ee)
Rt=4.58 min [Daicel Chiralpak AY-H, 5 μm, 250×4.6 mm; mobile phase: 80% isohexane, 20% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 30° C.; detection: 220 nm].
Example 61A
ent-tert-Butyl [2-amino-2-(3,4-difluorophenyl)ethyl]carbamate (enantiomer B)




100 mg of rac-tert-butyl [2-amino-2-(3,4-difluorophenyl)ethyl]carbamate (Example 55A) were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AY-H, 5 μm, 250×20 mm, mobile phase: 80% isohexane, 20% ethanol+0.2% diethylamine, flow rate 15 ml/min; 30° C., detection: 220 nm].
Yield: 44 mg of enantiomer B (99% pure, >99% ee) Rt=5.61 min [Daicel Chiralpak AY-H, 5 μm, 250×4.6 mm; mobile phase: 80% isohexane, 20% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 30° C.; detection: 220 nm].
Example 62A
ent-tert-Butyl [2-amino-2-(2,4-difluorophenyl)ethyl]carbamate (enantiomer A) 




435 mg of Example 59A were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AY-H, 5 μm, 250×20 mm, mobile phase: 80% isohexane, 20% ethanol+0.2% diethylamine, flow rate 15 ml/min; 30° C., detection: 220 nm]. To remove residual solvent, the product was dissolved in acetonitrile/water and lyophilized.
Yield: 182 mg (97% pure, >99% ee)
Enantiomer B: Rt=5.25 min [Daicel Chiralpak AY-H, 5 μm, 250×4.6 mm; mobile phase: 80% isohexane, 20% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 30° C.; detection: 220 nm].
Example 63A
ent-Benzyl tert-butyl [1-(3,4-difluorophenyl)ethane-1,2-diyl]biscarbamate




300 mg of ent-tert-butyl [2-amino-2-(3,4-difluorophenyl)ethyl]carbamate (enantiomer A) (Example 60A; 1.10 mmol) were initially charged in 5 ml of dry THF, and 1.15 ml of diisopropylethylamine (6.6 mmol, 6 equivalents), 26 mg of N,N-dimethylaminopyridine (0.22 mmol, 0.2 equivalents) and then, dropwise, 0.31 ml of benzyl chloroformate (2.2 mmol, 2 equivalents) were added. The reaction mixture was stirred at RT for 48 h, then concentrated, taken up in ethyl acetate and washed with water. The combined organic phases were washed with saturated aqueous sodium chloride solution, dried over magnesium sulphate, filtered and concentrated. The residue was chromatographed on silica gel (mobile phase: cyclohexane/ethyl acetate 1:1). This gave 336 mg (75% of theory) of the title compound.
LC-MS (Method 2): Rt=1.14 min
MS (ESpos): m/z=407.3 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.3 (s, 9H); 3.13 (t, 2H); 4.65 (q, 1H); 5.00 (q, 2H); 6.88 (t, 1H); 7.1 (br. s., 1H); 7.21-7.40 (m, 7H); 7.80 (d, 1H).
Example 64A
ent-Benzyl [2-amino-1-(3,4-difluorophenyl)ethyl]carbamate




16.5 ml of a 2 N solution of hydrochloric acid in diethyl ether were added to 335 mg of ent-benzyl tert-butyl [1-(3,4-difluorophenyl)ethane-1,2-diyl]biscarbamate (Example 63A; 0.824 mmol), and the mixture was stirred at RT overnight. Another 16.5 ml of a 4 N solution of hydrochloric acid in 1,4-dioxane were added, and the mixture was stirred at RT for a further 3 h. The reaction mixture was concentrated, saturated aqueous sodium bicarbonate solution was added and the mixture was extracted three times with ethyl acetate. The combined organic phases were washed with saturated aqueous sodium chloride solution, dried over magnesium sulphate, filtered and concentrated. This gave 252.4 mg (84% of theory) of the title compound.
LC-MS (Method 2): Rt=0.74 min
MS (ESpos): m/z=307.2 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.82-1.95 (br. s, 2H); 2.70 (d, 2H); 4.49 (q, 1H); 5.00 (m, 2H); 7.1 (br. s., 1H); 7.21-7.40 (m, 7H); 7.80 (d, 1H).
Example 65A
rac-tert-Butyl (3-ethoxy-2-hydroxypropyl)carbamate 




3 g of rac-1-amino-3-ethoxy-2-propanol hydrochloride (19.28 mmol, 1 equivalent) were initially charged in 40 ml of dichloromethane, and 5.7 ml of triethylamine (40.9 mmol, 2.1 equivalents) and then 4.96 ml of di-tert-butyl dicarbonate (21.6 mmol, 1.12 equivalents) were added. The reaction mixture was stirred at RT for 2 h, diluted with dichloromethane and washed with saturated aqueous sodium bicarbonate solution and with saturated aqueous sodium chloride solution. The organic phase was dried with magnesium sulphate, filtered and concentrated. The residue was dried under high vacuum. This gave 3.73 g of crude product (88% of theory) which were reacted further without any work-up.
1H NMR (400 MHz, DMSO-d6): δ=1.10 (t, 3H); 1.39 (s, 9H); 2.85 (dt, 1H); 3.02 (dt, 1H); 3.20-3.30 (m, 2H); 3.40 (q, 2H); 3.55-3.60 (m, 1H); 4.75 (d, 1H); 6.61 (t, 1H).
Example 66A
rac-tert-Butyl [2-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)-3-ethoxypropyl]carbamate




At RT, 3.73 g of rac-tert-butyl (3-ethoxy-2-hydroxypropyl)carbamate (17 mmol, 1 equivalent), 2.50 g of phthalimide (17 mmol, 1 equivalent) and 6.69 g of triphenylphosphine (25.52 mmol, 1.5 equivalents) were initially charged in 70 ml of dry THF. 5.06 ml of diisopropyl azodicarboxylate (25.5 mmol, 1.5 equivalents) were added dropwise, and the mixture was stirred at RT for 2 h. The reaction mixture was concentrated under reduced pressure. The crude product was diluted with methanol, acetonitrile and water to 90 ml and purified by preparative HPLC (column material: Sunfire C18 5 μm 75×30 mm; flow rate 56 ml/min; mobile phase: 45% Milli-Q-water/50% acetonitrile/5% 1% aqueous formic acid; injection volume: 0.5 ml; detection wavelength: 210 nm). This gave 4.88 g of the title compound (82% of theory).
LC-MS (Method 2): Rt=1.04 min
MS (ESpos): m/z=349.3 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.02 (t, 3H); 1.25 (s, 9H); 3.34-3.48 (m, 4H); 3.65 (dd, 1H); 3.81 (dd, 1H); 4.32-4.38 (m, 1H); 7.10 (t, 1H); 7.80-7.90 (m, 4H).
Example 67A
rac-tert-Butyl (2-amino-3-ethoxypropyl)carbamate




4.88 g of rac-tert-butyl [2-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)-3-ethoxypropyl]carbamate (14.0 mmol, 1 equivalent) were initially charged in 12 ml of 40% strength aqueous methylamine solution and reacted in a microwave at 100° C. for 1.5 h. The reaction mixture was concentrated, the residue was taken up in 10 ml of toluene and concentrated again. This step was repeated several times. The residue was then chromatographed on silica gel (mobile phase: dichloromethane/methanol 10:1). This gave 470 mg (15% of theory) of the title compound.
1H NMR (400 MHz, DMSO-d6): δ=1.10 (t, 3H); 1.38 (s, 9H); 3.03-3.20 (m, 3H); 3.34-3.48 (m, 4H); 6.95 (t, 1H).
Example 68A
rac-tert-Butyl (2-hydroxy-3-phenoxypropyl)carbamate




1.13 g of rac-1-amino-3-phenoxypropan-2-ol hydrochloride (5.5 mmol, 1 equivalent) were initially charged in 11.5 ml of dichloromethane, and 1.64 ml of triethylamine (11.7 mmol, 2.1 equivalents) and then 1.43 ml of di-tert-butyl dicarbonate (6.21 mmol, 1.12 equivalents) were added. The reaction mixture was stirred at RT for 2 h, diluted with dichloromethane and washed with saturated aqueous sodium bicarbonate solution and with saturated aqueous sodium chloride solution. The organic phase was dried with magnesium sulphate, filtered and concentrated. The residue was dried under high vacuum. This gave 1.5 g of crude product (quantitative yield) which was reacted further without further purification.
LC-MS (Method 2): Rt=0.88 min
MS (ESpos): m/z=268.2 (M+H)+
Example 69A
rac-tert-Butyl [2-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)-3-phenoxypropyl]carbamate




At RT, 1.5 g of rac-tert-butyl (2-hydroxy-3-phenoxypropyl)carbamate (5.6 mmol, 1 equivalent), 0.99 g of phthalimide (6.73 mmol, 1.2 equivalents) and 2.21 g of triphenylphosphine (8.4 mmol, 1.5 equivalents) were initially charged in 23 ml of dry tetrahydrofuran. 1.70 ml of diisopropyl azodicarboxylate (8.4 mmol, 1.5 equivalents) were added dropwise, and the mixture was stirred at RT for 2 h. LC/MS showed complete conversion of the reaction. The reaction mixture was concentrated and purified by chromatography on silica gel (Biotage Isolera; cyclohexane/ethyl acetate gradient as mobile phase). This gave 1.08 g of the title compound (48% of theory).
LC-MS (Method 2): Rt=1.13 min
MS (ESpos): m/z=397.3 (M+H)+
Example 70A
rac-tert-Butyl (2-amino-3-phenoxypropyl)carbamate




1.08 g of rac-tert-butyl [2-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)-3-phenoxypropyl]carbamate (2.72 mmol, 1 equivalent) were initially charged in 5 ml of 40% strength aqueous methylamine solution and reacted in a microwave at 100° C. for 2 h. The reaction mixture was concentrated and the residue was then chromatographed on silica gel (Biotage Isolera; mobile phase: dichloromethane/methanol gradient). This gave 200 mg (27% of theory) of the title compound.
LC-MS (Method 2): Rt=0.57 min
MS (ESpos): m/z=267.1 (M+H)+
Example 71A
rac-tert-Butyl [3-(4-fluorophenoxy)-2-hydroxypropyl]carbamate




0.93 g of rac-1-amino-3-(4-fluorophenoxy)propan-2-ol (5.07 mmol, 1 equivalent) were initially charged in 10.5 ml of dichloromethane, and first 1.5 ml of triethylamine (10.7 mmol, 2.1 equivalents) and then 1.31 ml of di-tert-butyl dicarbonate (5.68 mmol, 1.12 equivalents) were added. The reaction mixture was stirred at RT for 2 h. The mixture was then diluted with dichloromethane and washed with saturated aqueous sodium bicarbonate solution and with saturated aqueous sodium chloride solution. The organic phase was dried over magnesium sulphate, filtered and concentrated. The residue was used without further purification for the next reaction.
LC-MS (Method 2): Rt=0.89 min
MS (ESpos): m/z=286.2 (M+H)+
Example 72A
rac-tert-Butyl [2-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)-3-(4-fluorophenoxy)propyl]carbamate 




At RT, 1.5 g of rac-tert-butyl [3-(4-fluorophenoxy)-2-hydroxypropyl]carbamate (5.26 mmol, 1 equivalent), 0.93 g of phthalimide (6.31 mmol, 1.2 equivalents) and 2.07 g of triphenylphosphine (7.9 mmol, 1.5 equivalents) were initially charged in 22 ml of dry THF. 1.56 ml of diisopropyl azodicarboxylate (7.9 mmol, 1.5 equivalents) were added dropwise, and the mixture was stirred at RT for 2 h. The reaction mixture was concentrated under reduced pressure and purified by chromatography on silica gel (Biotage Isolera; cyclohexane/ethyl acetate gradient as mobile phase). This gave 1.97 g of the title compound (90% of theory).
LC-MS (Method 2): Rt=1.14 min
MS (ESpos): m/z=415.3 (M+H)+
Example 73A
rac-tert-Butyl [2-amino-3-(4-fluorophenoxy)propyl]carbamate




1.97 g of rac-tert-butyl [2-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)-3-(4-fluorophenoxy)propyl]-carbamate (4.75 mmol, 1 equivalent) were initially charged in 5 ml of 40% strength aqueous methylamine solution, and the mixture was reacted in a microwave at 100° C. for 2 h. The reaction mixture was concentrated and the residue was then chromatographed on silica gel (Biotage Isolera; mobile phase: dichloromethane/methanol gradient). This gave 900 mg (67% of theory) of the title compound.
LC-MS (Method 2): Rt=0.58 min
MS (ESpos): m/z=285.1 (M+H)+
Example 74A
rac-Benzyl (2-hydroxy-3-isopropoxypropyl)carbamate




1 g of rac-1-amino-3-isopropoxypropan-2-ol (7.5 mmol, 1 equivalent) were initially charged in 25 ml of THF, and 1.16 ml of benzyl chloroformate (8.3 mmol, 1.1 equivalents), 3.9 ml of diisopropylethylamine (22.5 mmol, 3 equivalents) and 183 mg of N,N-dimethylaminopyridine (1.5 mmol, 0.2 equivalents) were added. The reaction mixture was stirred at RT, and after about 30 min 5 ml of DMF were added. After a further 2.5 h at RT, the mixture was concentrated to dryness. The residue was taken up in ethyl acetate and washed with saturated aqueous sodium bicarbonate solution and then with saturated aqueous sodium chloride solution. The organic phase was dried over magnesium sulphate, filtered and concentrated. The residue was used without further purification for the next reaction.
LC-MS (Method 2): Rt=0.80 min
MS (ESpos): m/z=268.2 (M+H)+
Example 75A
rac-Benzyl [2-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)-3-isopropoxypropyl]carbamate




At RT, 1.28 g of racemic benzyl (2-hydroxy-3-isopropoxypropyl)carbamate (4.79 mmol, 1 equivalent), 0.85 g of phthalimide (5.75 mmol, 1.2 equivalents) and 1.88 g of triphenylphosphine (7.2 mmol, 1.5 equivalent) were initially charged in 20 ml of dry tetrahydrofuran. 1.42 ml of diisopropyl azodicarboxylate (7.2 mmol, 1.5 equivalent) were added dropwise, and the mixture was stirred at RT for 2 h. The reaction mixture was concentrated under reduced pressure and purified by chromatography on silica gel (Biotage Isolera; cyclohexane/ethyl acetate gradient as mobile phase). This gave 2.3 g (66% pure; 78% of theory) of the title compound (contaminated with diisopropyl hydrazine-1,2-dicarboxylate).
LC-MS (Method 2): Rt=1.12 min
MS (ESpos): m/z=397.2 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.91 (d, 3H), 1.00 (d, 3H), 3.42-3.48 (m, 2H), 3.50 (hept, 1H), 3.69 (dd, 1H), 3.79 (t, 1H), 4.31 (q, 1H), 4.91 (s, 2H), 7.20-7.30 (m, 5H), 7.52 (t, 1H), 7.80-7.86 (m, 4H).
Example 76A
rac-Benzyl (2-amino-3-isopropoxypropyl)carbamate




2.3 g of rac-benzyl [2-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)-3-isopropoxypropyl]carbamate (5.6 mmol, 1 equivalent) were dissolved in 30 ml of ethanol, 7.3 ml of 40% strength aqueous methylamine solution (84.4 mmol, 15 equivalent) were added and the mixture was stirred at 60° C. overnight. The reaction mixture was concentrated and the residue was then chromatographed on silica gel (Biotage Isolera; mobile phase: dichloromethane/methanol gradient). This gave 730 mg (49% of theory) of the title compound.
LC-MS (Method 2): Rt=0.59 min
MS (ESpos): m/z=267.2 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.05 (d, 6H), 1.74 (br. s, 2H), 2.79-2.90 (m, 2H), 3.02-3.12 (m, 1H), 3.18 (dd, 1H), 3.21 (dd, 1H), 3.50 (q, 1H), 5.00 (s, 2H), 7.18 (t, 1H), 7.28-7.39 (m, 5H).
Example 77A
rac-tert-Butyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)-amino]-2-(3,4-difluorophenyl)ethyl}carbamate




200 mg of 8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid (0.63 mmol), 242 mg of rac-(benzotriazol-1-yloxy)bisdimethylaminomethylium fluoroborate (TBTU, 0.75 mmol) and 318 mg of 4-methylmorpholine (3.14 mmol) were initially charged in 4.3 ml of DMF. At RT, 242 mg of rac-tert-butyl [2-amino-2-(3,4-difluorophenyl)ethyl]carbamate (Example 55A, 0.75 mmol) were added, and the mixture was stirred at RT overnight. About 16 ml of water were added to the reaction solution, the mixture was stirred for another 30 min and the precipitate formed was filtered off and washed with water. The solid was treated in an ultrasonic bath with about 4 ml of acetonitrile for 10 min, filtered off and dried under high vacuum overnight. This gave 355 mg of the title compound (96% of theory).
LC-MS (Method 2): Rt=1.10 min
MS (ESpos): m/z=573 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.32 (s, 9H), 2.59 (s, 3H), 3.29-3.46 (m, 2H), 5.15 (q, 1H), 5.31 (s, 2H), 6.91 (t, 1H), 7.01 (d, 1H), 7.08 (t, 1H), 7.19-7.27 (m, 3H), 7.36-7.51 (m, 2H), 7.59 (q, 1H), 8.21 (d, 1H), 8.56 (d, 1H).
The examples shown in Table 8A were prepared by reacting 8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid with the amines, prepared as described above or commercially available, (1.1-1.5 equivalents) and 4-methylmorpholine (4-6 equivalents) under the reaction conditions described in the General Working Procedure 3.









TABLE 8A





Exam-
IUPAC name/structure



ple
(yield)
Analytical data







78A
rac-tert-butyl {2-(4-chlorophenyl)-2-[({8-[(2,6- difluorobenzyl)oxy]-2-methylimidazo[1,2-a]- pyridin-3-yl}carbonyl)amino]ethyl}carbamate   


   (88% of theory)
LC-MS (Method 2): Rt = 1.13 min MS (ESpos): m/z = 571 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.32 (s, 9H), 2.58 (s, 3H), 3.29- 3.46 (m, 2H), 5.16 (q, 1H), 5.31 (s, 2H), 6.91 (t, 1H), 7.02 (d, 1H), 7.09 (t, 1H), 7.23 (t, 2H), 7.38-7.45 (m, 4H), 7.59 (quint, 1H), 8.21 (d, 1H), 8.56 (d, 1H).


 


79A
rac-tert-butyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2- methylimidazo[1,2-a]pyridin-3-yl}carbonyl)- amino]-2-(4-fluorophenyl)ethyl}carbamate   


   (99% of theory)
LC-MS (Method 2): Rt = 1.03 min MS (ESpos): m/z = 555 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.32 (s, 9H), 2.58 (s, 3H), 3.29- 3.46 (m, 2H), 5.18 (q, 1H), 5.31 (s, 2H), 6.91 (t, 1H), 7.02 (d, 1H), 7.08 (t, 1H), 7.13-7.26 (m, 4H), 7.43 (dd, 2H), 7.59 (quint, 1H), 8.19 (d, 1H), 8.56 (d, 1H).


 


80A
rac-tert-butyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2- methylimidazo[1,2-a]pyridin-3-yl}carbonyl)- amino]-2-phenylethyl}carbamate   


   (63% of theory)
LC-MS (Method 2): Rt = 1.06 min MS (ESpos): m/z = 537 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.32 (s, 9H), 2.59 (s, 3H), 3.28- 3.46 (m, 2H), 5.19 (q, 1H), 5.31 (s, 2H), 6.91 (t, 1H), 7.01 (d, 1H), 7.08 (t, 1H), 7.20-7.28 (m, 3H), 7.38 (t, 2H), 7.40 (d, 2H), 7.59 (quint, 1H), 8.19 (d, 1H), 8.57 (d, 1H).


 


81A
ent-tert-butyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2- methylimidazo[1,2-a]pyridin-3-yl}carbonyl)- amino]-2-(2,4-difluorophenyl)ethyl}carbamate   


   (64% of theory)
LC-MS (Method 2): Rt = 1.07 min MS (ESpos): m/z = 573 (M + H)+


 


82A
rac-tert-butyl [2-({[8-(cyclohexylmethoxy)-2- methylimidazo[1,2-a]pyridin-3-yl]carbonyl}- amino)-2-phenylethyl]carbamate trifluoroacetate   


   (41% of theory)
LC-MS (Method 2): Rt = 1.09 min MS (ESpos):m/z = 507 (M − TFA + H)+


 


83A
rac-tert-butyl [2-(4-chlorophenyl)-2-({[8-(cyclo- hexylmethoxy)-2-methylimidazo[1,2-a]pyridin-3- yl]carbonyl}amino)ethyl]carbamate trifluoroacetate   


   (67% of theory)
LC-MS (Method 2): Rt = 1.17 min MS (ESpos): m/z = 541 (M − TFA + H)+


 


84A
rac-tert-butyl [2-({[8-(cyclohexylmethoxy)-2- methylimidazo[1,2-a]pyridin-3-yl]carbonyl}- amino)-2-(3,4-difluorophenyl)ethyl]carbamate trifluoroacetate   


   (58% of theory)
LC-MS (Method 2): Rt = 1.17 min MS (ESpos): m/z = 543 (M − TFA + H)+


 


85A
ent-tert-butyl [2-({[8-(cyclohexylmethoxy)-2- methylimidazo[1,2-a]pyridin-3-yl]carbonyl}- amino)-2-(2,4-difluorophenyl)ethyl]carbamate trifluoroacetate   


   (42% of theory)
LC-MS (Method 2): Rt= 1.17 min MS (ESpos): m/z = 543 (M − TFA + H)+


 


86A
rac-tert-butyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2- methylimidazo[1,2-a]pyridin-3-yl}carbonyl)- amino]propyl}carbamate   


   (57% of theory)
LC-MS (Method 1): Rt = 1.04 min MS (ESpos): m/z = 475 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.14 (d, 3H), 1.36 (s, 9H), 2.50 (s, 3H), 3.04-3.20 (m, 2H), 4.06-4.16 (m, 1H), 5.30 (s, 2H), 6.89-7.03 (m, 3H), 7.22 (t, 2H), 7.56-7.64 (m, 2H), 8.61 (d, 1H).


 


87A
rac-tert-butyl {2-[({6-chloro-8-[(2,6- difluorobenzyl)oxy]-2-methylimidazo[1,2-a]- pyridin-3-yl}carbonyl)amino]propyl}carbamate trifluoroacetate   


   (74% of theory, purity about 80%)
LC-MS (Method 2): Rt = 1.11 min MS (ESpos): m/z = 509 (M − TFA + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.15 (d, 3H), 1.37 (s, 9H), 2.50 (s, 3H), 3.05-3.19 (m, 2H), 4.05-4.17 (m, 1H), 5.38 (s, 2H), 6.98 (t, 1H), 7.22 (t, 2H), 7.31 (s, 1H), 7.60 (quintet, 1H), 7.80 (d, 1H), 8.72 (s, 1H).


 


88A
rac-tert-butyl {2-[({8-[(2,6-difluorobenzyl)oxy]- 2,6-dimethylimidazo[1,2-a]pyridin-3- yl} carbonyl)amino]propyl}carbamate   


   (78% of theory, purity about 93%)
LC-MS (Method 2): Rt = 0.95 min MS (ESpos): m/z = 489 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.13 (d, 3H), 1.37 (s, 9H), 2.31 (s, 3H), 2.46 (s, 3H), 3.01-3.19 (m, 2H), 4.05-4.17 (m, 1H), 5.29 (s, 2H), 6.90 (s, 1H), 6.96 (t, 1H), 7.22 (t, 2H), 7.53- 7.63 (m, 2H), 8.43 (s, 1H).


 


89A
rac-tert-butyl {1-[({6-chloro-8-[(2,6- difluorobenzyl)oxy]-2-methylimidazo[1,2-a]- pyridin-3-yl}carbonyl)amino]propan-2-yl}- carbamate trifluoroacetate 1)   


   (74% of theory)
LC-MS (Method 2): Rt = 1.15 min MS (ESpos): m/z = 509 (M − TFA + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.07 (d, 3H), 1.36 (s, 9H), 2.50 (s, 3H), 3.20-3.37 (m, 2H), 3.69-3.82 (m, 1H), 5.37 (s, 2H), 6.69 (d, 1H), 7.24 (t, 2H), 7.33 (s, 1H), 7.61 (quintet, 1H), 8.02 (br s, 1H), 8.78 (s, 1H).


 


90A
tert-butyl {2-[({6-chloro-8-[(2,6- difluorobenzyl)oxy]-2-methylimidazo[1,2-a]- pyridin-3-yl}carbonyl)amino]-2- methylpropyl}carbamate trifluoroacetate 1)   


   (72% of theory)
LC-MS (Method 2): Rt = 1.23 min MS (ESpos): m/z = 523 (M − TFA + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.31 (s, 6H), 1.34 (s, 9H), 2.48 (s, 3H), 3.31 (d, 2H), 5.38 (s, 2H), 7.08 (t, 1H), 7.24 (t, 2H), 7.33 (br s, 1H), 7.58- 7.67 (m, 2H), 8.69 (s, 1H).


 


91A
rac-tert-butyl {1-[({8-[(2,6-difluorobenzyl)oxy]- 2,6-dimethylimidazo[1,2-a]pyridin-3-yl}- carbonyl)amino]propan-2-yl}carbamate trifluoroacetate 1)   


   (70% of theory)
LC-MS (Method 2): Rt = 0.95 min MS (ESpos): m/z = 489 (M − TFA + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.08 (d, 3H), 1.36 (s, 9H), 2.39 (s, 3H), 2.50 (s, 3H), 3.20-3.38 (m, 2H), 3.69-3.82 (m, 1H), 5.39 (s, 2H), 6.70 (d, 1H), 7.24 (t, 2H), 7.41 (br s, 1H), 7.61 (quintet, 1H), 8.28 (br s, 1H), 8.53 (s, 1H).


 


92A
tert-butyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2,6- dimethylimidazo[1,2-a]pyridin-3-yl}- carbonyl)amino]-2-methylpropyl}carbamate trifluoroacetate 1)   


   (66% of theory)
LC-MS (Method 2): Rt = 1.00 min MS (ESpos): m/z = 503 (M − TFA + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.32 (s, 6H), 1.34 (s, 9H), 2.42 (s, 3H), 2.50 (s, 3H), 3.32 (d, 2H), 5.41 (s, 2H), 7.09 (t, 1H), 7.24 (t, 2H), 7.50 (br s, 1H), 7.61 (quintet, 1H), 7.88 (br s, 1H), 8.49 (s, 1H).


 


93A
tert-butyl (1-{2-[({6-chloro-8-[(2,6- difluorobenzyl)oxy]-2-methylimidazo[1,2-a]- pyridin-3-yl}carbonyl)amino]ethyl}cyclo- hexyl)carbamate trifluoroacetate   


   (91% of theory)
LC-MS (Method 2): Rt = 1.36 min MS (ESpos): m/z = 577 (M − TFA + H)+


 


94A
rac-tert-butyl {1-[({8-[(2,6-difluorobenzyl)oxy]-2- methylimidazo[1,2-a]pyridin-3-yl}- carbonyl)amino]propan-2-yl}carbamate trifluoroacetate   


   (71% of theory)
LC-MS (Method 7): Rt = 0.88 min MS (ESpos): m/z = 475 (M − TFA + H)+


 


95A
ent-tert-butyl {(2R)-1-[({6-chloro-8-[(2,6- difluorobenzyl)oxy]-2-methylimidazo[1,2-a]- pyridin-3-yl}carbonyl)amino]butan-2-yl}- carbamate trifluoroacetate   


   (81% of theory)
LC-MS (Method 2): Rt = 1.17 min MS (ESpos): m/z = 523 (M − TFA + H)+


 


96A
tert-butyl {3-[({6-chloro-8-[(2,6- difluorobenzyl)oxy]-2-methylimidazo[1,2-a]- pyridin-3-yl}carbonyl)amino]propyl}carbamate trifluoroacetate   


   (80% of theory)
LC-MS (Method 2): Rt = 1.10 min MS (ESpos): m/z = 509 (M − TFA + H)+


 


97A
tert-butyl {2-[({6-chloro-8-[(2,6- difluorobenzyl)oxy]-2-methylimidazo[1,2-a]- pyridin-3-yl}carbonyl)amino]ethyl}carbamate trifluoroacetate   


   (76% of theory)
LC-MS (Method 7): Rt = 1.11 min MS (ESpos): m/z = 495 (M − TFA + H)+


 


98A
tert-butyl (1-{[({8-[(2,6-difluorobenzyl)oxy]-2- methylimidazo[1,2-a]pyridin-3-yl}carbonyl)- amino]methyl}cyclopropyl)carbamate trifluoroacetate   


   (80% of theory)
LC-MS (Method 7): Rt = 0.90 min MS (ESpos): m/z = 487 (M − TFA + H)+


 


99A
tert-butyl (1-{[({6-chloro-8-[(2,6- difluorobenzyl)oxy]-2-methylimidazo[1,2-a]- pyridin-3-yl}carbonyl)amino]methyl}cyclopropyl)- carbamate trifluoroacetate   


   (66% of theory)
LC-MS (Method 7): Rt = 1.20 min MS (ESpos): m/z = 521 (M − TFA + H)+


 


100A
tert-butyl (1-{[({8-[(2,6-difluorobenzyl)oxy]-2,6- dimethylimidazo[1,2-a]pyridin-3-yl}carbonyl)- amino]methyl}cyclopropyl)carbamate trifluoroacetate   


   (86% of theory)
LC-MS (Method 7): Rt = 0.93 min MS (ESpos): m/z = 501 (M − TFA + H)+


 


101A
tert-butyl (1-{[({8-[(2,6-difluorobenzyl)oxy]-2- methylimidazo[1,2-a]pyridin-3-yl}carbonyl)- amino]methyl}cyclopentyl)carbamate trifluoroacetate   


   (73% of theory)
LC-MS (Method 7): Rt = 1.04 min MS (ESpos): m/z = 515 (M − TFA + H)+


 


102A
tert-butyl (1-{[({6-chloro-8-[(2,6- difluorobenzyl)oxy]-2-methylimidazo[1,2-a]- pyridin-3-yl}carbonyl)amino]methyl}cyclopentyl)- carbamate trifluoroacetate   


   (85% of theory)
LC-MS (Method 7): Rt = 1.36 min MS (ESpos): m/z = 549 (M − TFA + H)+


 


103A
rac-tert-butyl 3-[({8-[(2,6-difluorobenzyl)oxy]-2- methylimidazo[1,2-a]pyridin-3-yl}carbonyl)- amino]indolin-1-carboxylate   


   (83% of theory)
LC-MS (Method 2): Rt = 1.16 min MS (ESpos): m/z = 535 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.52 (s, 9H), 2.49 (s, 3H), 3.69 (dd, 1H), 4.29 (t, 1H), 5.30 (s, 2H), 5.64- 5.73 (m, 1H), 6.94-7.06 (m, 3H), 7.19- 7.30 (m, 3H), 7.40 (d, 1H), 7.60 (quintet, 1H), 7.79 (br s, 1H), 8.51 (d, 1H), 8.67 (d, 1H).


 


104A
rac-tert-butyl 3-[({6-chloro-8-[(2,6- difluorobenzyl)oxy]-2-methylimidazo[1,2-a]- pyridin-3-yl}carbonyl)amino]indolin-1-carboxylate 2)   


   (87% of theory)
LC-MS (Method 2): Rt = 1.39 min MS (ESpos): m/z = 569 (M + H)+


 


105A
rac-tert-butyl 4-[({8-[(2,6-difluorobenzyl)oxy]-2- methylimidazo[1,2-a]pyridin-3-yl}carbonyl)- amino]-3,4-dihydroquinoline-1(2H)-carboxylate 3)   


   (75% of theory)
LC-MS (Method 2): Rt = 1.14 min MS (ESpos): m/z = 549 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.49 (s, 9H), 1.97-2.08 (m, 1H), 2.12-2.21 (m, 1H), 2.50 (s, 3H), 3.72- 3.79 (m, 1H), 3.82-3.90 (m, 1H), 5.27 (q, 1H), 5.31 (s, 2H), 6.94-7.11 (m, 3H), 7.18-7.28 (m, 3H), 7.36 (d, 1H), 7.59 (quintet, 1H), 7.62 (d, 1H), 8.42 (d, 1H), 8.60 (d, 1H).





1) Work-up: The crude reaction mixture was concentrated and purified by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA).


2) Work-up: The precipitate was purified by silica gel chromatography (mobile phase: dichloromethane:methanol 200:1).


3) Work-up: The precipitate was purified by silica gel chromatography (mobile phase: cyclohexane:ethyl acetate 2:1).






Example 106A
ent-tert-Butyl {2-[({8-[(2,6-difluorobenzyl)oxy]-6-fluoro-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]-2-(3,4-difluorophenyl)ethyl}carbamate 




90 mg of 8-[(2,6-difluorobenzyl)oxy]-6-fluoro-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid (Example 11A; 0.268 mmol, 1 equivalent), 132 mg of O-(7-azabenzotriazol-1-yl)-N,N,N′N′-tetramethyluronium hexafluorophosphate (0.348 mmol, 1.4 equivalents) and 0.132 ml of N,N-diisopropylethylamine (0.803 mmol, 3 equivalents) were initially charged in 0.85 ml of DMF, 102 mg of ent-tert-butyl [2-amino-2-(3,4-difluorophenyl)ethyl]carbamate (Example 60A) were added at RT and the mixture was stirred at RT overnight. Water was added to the reaction solution, the mixture was stirred for another 30 min and the precipitate formed was filtered off and washed with water, a little acetonitrile and methanol. This gave 148 mg (85% of theory) of the title compound.
LC-MS (Method 2): Rt=1.24 min
MS (ESpos): m/z=591.4 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.34 (s, 9H), 2.58 (s, 3H; partially obscured by DMSO signal), 3.35-3.45 (m, 2H; partially superimposed by H2O signal), 5.15 (q, 1H), 5.31 (s, 2H), 7.10 (t, 1H), 7.19-7.27 (m, 4H), 7.36-7.50 (m, 2H), 7.59 (quint, 1H), 8.21 (d, 1H), 8.62 (d, 1H).
The examples shown in Table 9A were prepared by reacting the Examples 3A, 16A, 21A, 25A and 28A, respectively, with the appropriate amines, commercially available or prepared according to the methods described, and N,N-diisopropylethylamine under the reaction conditions described in the representative Working Procedure 3.









TABLE 9A





Exam-
IUPAC name/structure



ple
(yield)
Analytical data







107A
ent-tert-butyl {2-[({8-[(2,6-difluorobenzyl)oxy]- 2,6-dimethylimidazo[1,2-a]pyridin-3-yl}carbonyl)- amino]-2-(3,4-difluorophenyl)ethyl}carbamate   


   (94% of theory)
LC-MS (Method 2): Rt = 1.13 min MS (ESpos): m/z = 587 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.32 (s, 9H), 2.28 (s, 3H); 2.52 (s, 3H), 3.33-3.46 (m, 2H; superimposed by H2O signal), 5.13 (q, 1H), 5.28 (s, 2H), 6.92 (s, IH), 7.08 (t, 1H), 7.20- 7.26 (m, 3H), 7.36-7.51 (m, 2H); 7.60 (quint, 1H), 8.19 (d, 1 H); 8.38 (s, 1H). 


 


108A
ent-tert-butyl {2-[({2-cyclopropyl-8-[(2,6- difluorobenzyl)oxy]imidazo[1,2-a]pyridin-3-yl}- carbonyl)amino]-2-(3,4-difluorophenyl)- ethyl}carbamate   


   (79% of theory)
LC-MS (Method 2): Rt = 1.23 min MS (ESpos): m/z = 599.4 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 0.9-1.05 (m, 4 H): 1.35 (s, 9H), 2.40-2.48 (m, 1 H); 3.31-3.48 (m, 2H; superimposed by H2O signal), 5.13 (q, 1H), 5.30 (s, 2H), 6.89 (t, 1H), 7.01 (d, 1H), 7.10 (t, 1H), 7.21 (t, 2H), 7.22 (m, 1 H); 7.35-7.48 (m, 2H), 7.59 (quint, 1H), 8.41 (d, 1 H); 8.51 (d, 1H).


 


109A
ent-tert-butyl {2-[({8-[(2,6- difluorobenzyl)oxy]imidazo[1,2-a]pyridin-3- yl}carbonyl)amino]-2- (3,4-difluorophenyl)ethyl}carbamate   


   (64% of theory)
LC-MS (Method 2): Rt = 1.13 min MS (ESpos): m/z = 559.4 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.30 (s, 9H), 3.29-3.35 (m, 2H, superimposed by H2O signal), 5.13 (q, 1H), 5.31 (s, 2H), 7.00-7.12 (m, 3 H); 7.21 (m, 1 H); 7.23 (t, 2H), 7.35- 7.48 (m, 2H), 7.59 (quint, 1H), 8.30 (s, 1 H); 8.71 (d, 1H), 8.99 (d, 1H).


 


110A
rac-tert-butyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2- methylimidazo[1,2-a]pyridin-3- yl}carbonyl)amino]-3-ethoxypropyl}carbamate   


   (65% of theory)
LC-MS (Method 2): Rt = 0.93 min MS (ESpos): m/z = 519.4 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.10 (t, 3H); 1.35 (s, 9H), 2.55 (s, 3H; obscured by DMSO signal), 3.23 (t, 2H), 3.45-3.52 (m, 4H); 4.20 (m, 1H); 5.31 (s, 2H), 6.90-7.08 (m, 3H); 7.20 (t, 2H); 7.52-7.61 (m, 2H); 8.62 (d, 1H).


 


111A
rac-tert-butyl {2-[({6-chloro-8-[(2,6- difluorobenzyl)oxy]-2-methylimidazo[1,2- a]pyridin-3-yl}carbonyl)amino]-3- ethoxypropyl}carbamate   


   (86% of theory)
LC-MS (Method 2): Rt = 1.18 min MS (ESpos): m/z = 553.4 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.10 (t, 3H); 1.37 (s, 9H), 2.55 (s, 3H; superimposed by DMSO signal), 3.18-3.26 (m, 2H), 3.47-3.51 (m, 4H); 4.21 (q, 1H), 5.32 (s, 2H), 6.92 (t, 1H), 7.20 (s, 1H); 7.23 (t, 2H), 7.59 (quint, 1H), 7.61 (d, 1H); 8.70 (s, 1 H).


 


112A
rac-tert-butyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2- methylimidazo[1,2-a]pyridin-3- yl}carbonyl)amino]- 3-(4-fluorophenoxy)propyl}carbamate   


   (14% of theory)
LC-MS (Method 2): Rt = 1.09 min MS (ESpos): m/z = 585.2 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.32 (s, 9H), 2.55 (s, 3H; obscured by DMSO signal), 3.30 (superimposed by water signal; 2H), 4.04 (q, 2H), 4.40 (m, 1H), 5.30 (s, 2H), 6.90-7.05 (m, 4H), 7.09 (t, 1H); 7.11 (t, 2H), 7.21 (t, 2H), 7.60 (q, 1H), 7.75 (d, 1H), 8.60 (d, 1H).


 


113A
rac-tert-butyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2- methylimidazo[1,2-a]pyridin-3- yl}carbonyl)amino]-3-phenoxypropyl}carbamate   


   (41% of theory)
LC-MS (Method 2): Rt = 1.09 min MS (ESpos): m/z = 557.2 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.34 (s, 9H), 2.55 (s, 3H; obscured by DMSO signal), 3.30 (superimposed by water signal; 2H), 4.08 (m, 2H), 4.42 (m, 1H), 5.30 (s, 2H), 6.90-7.05 (m, 5H), 7.09 (t, 1H); 7.21 (t, 2 H), 7.27 (t, 2H), 7.58 (q, 1H), 7.72 (d, 1H), 8.60 (d, 1H).


 


114A
ent-tert-butyl (3S)-3-[({8-[(2,6- difluorobenzyl)oxy]-2-methylimidazo[1,2- a]pyridin-3-yl}carbonyl)amino]piperidin-1- carboxylate   


   (68% of theory)
LC-MS (Method 2): Rt = 0.95 min MS (ESpos): m/z = 501.4 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.37 (s, 9H), 1.40-1.48 (m, 1H); 1.60-1.70 (m, 2H); 1.86-1.93 (m, 1H); 2.55 (s, 3H; superimposed by DMSO signal); 2.85-3.10 (m, 2H); 3.51-3.91 (m, 3H); 5.30 (s, 2H); 6.92 (t, 1H); 7.05 (d, 1H); 7.23 (t, 2H); 7.59 (quint, 1H), 7.71 (br. s, 1H); 8.60 (d, 1H).


 


115A
ent-benzyl (3S)-3-[({8-[(2,6-difluorobenzyl)oxy]- 2-methylimidazo[1,2-a]pyridin-3-yl}- carbonyl)amino]pyrrolidin-1-carboxylate   


   (66% of theory)
LC-MS (Method 2): Rt = 0.97 min MS (ESpos): m/z = 521.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.90-2.02 (m, 1H); 2.11-2.21 (m, 1H); 2.49 (s, 3H); 3.31-3.69 (m, 4 H); 4.50 (m, 1H); 5.08 (s, 2H); 5.30 (s, 2H); 6.91 (t, 1H); 7.02 (d, 1 H); 7.23 (t, 2H); 7.25-7.37 (m, 5H); 7.59 (quint, 1H), 8.11 (d, 1H); 8.51 (d, 1H).


 


116A
rac-benzyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2- methylimidazo[1,2-a]pyridin-3- yl}carbonyl)amino]- 3-isopropoxypropyl}carbamate   


   (42% of theory)
LC-MS (Method 1): Rt = 1.21 min MS (ESpos): m/z = 567.1 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.08 (d, 6H), 2.55 (s, 3H; obscured by DMSO signal), 3.20-3.35 (m, 2H), 3.45 (q, 2H), 3.55 (q, 1 H), 4.20 (m, 1H), 5.00 (s, 2 H), 5.31 (s, 2H), 6.90 (t, 1H), 7.00 (d, 1 H), 7.20-7.30 (m, 7H), 7.38 (t, 1H), 7.50 (d, 1H), 7.60 (q, 1H), 8.60 (d, 1H).


 


117A
ent-benzyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2- methylimidazo[1,2-a]pyridin-3- yl}carbonyl)amino]-1-(3,4- difluorophenyl)ethyl}carbamate   


   (55% of theory) starting with Example 64A
LC-MS (Method 2): Rt = 1.08 min MS (ESpos): m/z = 607.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 2.30 (s, 3H); 3.46-3.63 (m, 2H); 4.88 - 5.05 (m, 3H); 5.30 (s, 2H); 6.90 (t, 1H); 7.00 (d, 1H); 7.15-7.48 (m, 10H); 7.58 (q, 1H); 7.88 (t, 1H); 7.96 (d, 1H); 8.51 (d, 1H).









Example 118A
ent-tert-Butyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)-amino]-2-(3,4-difluorophenyl)ethyl}carbamate 




1.50 g of 8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid (4.71 mmol), 1.67 g of (benzotriazol-1-yloxy)bisdimethylaminomethylium fluoroborate (TBTU, 5.18 mmol) and 2.38 g of 4-methylmorpholine (23.5 mmol) were initially charged in 30 ml of DMF. At RT, 1.48 g of ent-tert-butyl [2-amino-2-(3,4-difluorophenyl)ethyl]carbamate (Example 60A, 5.42 mmol) were added, and the mixture was stirred at RT for 2 h. The reaction mixture was poured into about 250 ml of water and the precipitated solid was stirred at RT for about 30 min. The solid was then filtered off, washed with water and subsequently dried under high vacuum. The crude product was purified by silica gel chromatography (mobile phase: dichloromethane/methanol=100/1). This gave 2.18 g of the title compound (81% of theory).
LC-MS (Method 2): Rt=1.12 min
MS (ESpos): m/z=573 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.32 (s, 9H), 2.59 (s, 3H), 3.29-3.46 (m, 2H), 5.15 (q, 1H), 5.31 (s, 2H), 6.91 (t, 1H), 7.01 (d, 1H), 7.08 (t, 1H), 7.19-7.27 (m, 3H), 7.36-7.51 (m, 2H), 7.59 (quint, 1H), 8.21 (d, 1H), 8.56 (d, 1H).
Example 119A
ent-tert-Butyl {2-[({6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]propyl}carbamate (enantiomer A) 




227 mg of Example 87A were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 70% isohexane, 30% ethanol, flow rate 20 ml/min; 25° C., detection: 230 nm].
Yield enantiomer A: 74 mg (>99% ee)
Enantiomer A: Rt=4.66 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% ethanol; flow rate: 1.0 ml/min; 25° C.; detection: 230 nm].
Example 120A
ent-tert-Butyl {2-[({6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]propyl}carbamate (enantiomer B)




227 mg of Example 87A were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 70% isohexane, 30% ethanol, flow rate 20 ml/min; 25° C., detection: 230 nm].
Yield enantiomer B: 58 mg (>99% ee)
Enantiomer B: Rt=5.90 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% ethanol; flow rate 1.0 ml/min; 25° C.; detection: 230 nm].
1H NMR (400 MHz, DMSO-d6): δ=1.13 (d, 3H), 1.37 (s, 9H), 2.50 (s, 3H), 3.05-3.19 (m, 2H), 4.05-4.17 (m, 1H), 5.33 (s, 2H), 6.95 (t, 1H), 7.19 (s, 1H), 7.22 (t, 2H), 7.60 (quintet, 1H), 7.68 (d, 1H), 8.71 (s, 1H).
Example 121A
ent-tert-Butyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]propyl}carbamate (enantiomer A)




215 mg of Example 88A were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 70% isohexane, 30% ethanol+0.2% diethylamine, flow rate: 15 ml/min; 30° C., detection: 220 nm].
Enantiomer A (still contaminated) was dissolved in 0.5 ml of methanol and 2.5 ml of tert-butyl methyl ether and re-purified [column: Daicel Chiralpak IA, 5 μm, 250×20 mm, mobile phase: 70% isohexane, 30% ethanol+0.2% diethylamine, flow rate 25 ml/min; 25° C., detection: 220 nm]
Yield enantiomer A: 48 mg (>99% ee)
Enantiomer A: Rt=7.48 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm; mobile phase: 70% isohexane, 30% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 30° C.; detection: 220 nm].
Example 122A
ent-tert-Butyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]propyl}carbamate (enantiomer B)




215 mg of Example 88A were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 70% isohexane, 30% ethanol+0.2% diethylamine, flow rate: 15 ml/min; 30° C., detection: 220 nm].
Yield enantiomer B: 67 mg (>99% ee)
Enantiomer B: 11.28 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm; mobile phase: 70% isohexane, 30% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 30° C.; detection: 220 nm].
Example 123A
ent-tert-Butyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)-amino]-3-ethoxypropyl}carbamate (enantiomer A) 




211 mg of Example 110A were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% ethanol, flow rate: 15 ml/min; 30° C., detection: 220 nm].
Yield enantiomer A: 84 mg (99% ee)
Enantiomer A: Rt=7.56 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% ethanol; flow rate 1.0 ml/min; 30° C.; detection: 220 nm].
Example 124A
ent-tert-Butyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)-amino]-3-ethoxypropyl}carbamate (enantiomer B) 




211 mg of Example 110A were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% ethanol, flow rate: 15 ml/min; 30° C., detection: 220 nm].
Yield enantiomer B: 82 mg (99% ee)
Enantiomer B: Rt=9.71 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% ethanol; flow rate 1.0 ml/min; 30° C.; detection: 220 nm].
Example 125A
ent-tert-Butyl {2-[({6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]-3-ethoxypropyl}carbamate (enantiomer A) 




270 mg of Example 111A were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% isopropanol, flow rate: 15 ml/min; 30° C., detection: 220 nm].
Yield enantiomer A: 114 mg (99% ee)
Enantiomer A: Rt=4.66 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% isopropanol; flow rate 1.0 ml/min; 30° C.; detection: 220 nm].
Example 126A
ent-tert-Butyl {2-[({6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]-3-ethoxypropyl}carbamate (enantiomer B) 




270 mg of Example 111A were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% isopropanol, flow rate: 15 ml/min; 30° C., detection: 220 nm].
Yield enantiomer B: 118 mg (99% ee)
Enantiomer B: Rt=6.75 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% ethanol; flow rate 1.0 ml/min; 30° C.; detection: 220 nm].
Example 127A
tert-Butyl 3-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]-9-azabicyclo[3.3.1]nonane-9-carboxylate trifluoroacetate




400 mg (1.07 mmol) of (8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carbonyl chloride hydrochloride (Example 22A) were initially charged in 40 ml of dry THF. 309 mg (1.29 mmol) of tert-butyl 3-amino-9-azabicyclo[3.3.1]nonane-9-carboxylate and 554 mg (4.29 mmol) of N,N-diisopropylethylamine were then added, and the mixture was stirred at RT for 1 h. The reaction solution was concentrated and purified by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). This gave 620 mg of the title compound (88% of theory).
LC-MS (Method 2): Rt=1.07 min
MS (ESpos): m/z=541 (M−TFA+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.40 (s, 9H), 1.62-1.79 (m, 7H), 1.81-2.06 (m, 3H), 2.50 (s, 3H), 4.22 (d, 2H), 4.78-4.90 (m, 1H), 5.40 (s, 2H), 7.25 (t, 3H), 7.41 (br s, 1H), 7.60 (quint, 1H), 8.09 (br s, 1H), 8.63 (d, 1H).
Example 128A
8-[(2,6-Difluorobenzyl)oxy]-N-[(2R)-1-hydroxyhexan-2-yl]-2-methylimidazo[1,2-a]pyridine-3-carboxamide




2 g of 8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid (Example 3A, 6.28 mmol, 1 equivalent), 2.2 g of (benzotriazol-1-yloxy)bisdimethylaminomethylium fluoroborate (TBTU; 6.9 mmol, 1.1 equivalents) and 3.45 ml of 4-methylmorpholine (31.4 mmol, 5 equivalents) were initially charged in 15 ml of dichloromethane and 10 ml of DMF. 810 mg of (R)-(−)-2-amino-1-hexanol (6.9 mmol, 1.1 equivalents) were added at RT, and the mixture was stirred for 3 h. The mixture was then diluted with dichloromethane and adjusted to pH4 with water and 1 N aqueous hydrochloric acid. The organic phase was separated off and the aqueous phase was extracted twice with dichloromethane. The combined organic phases were washed twice with water, dried over sodium sulphate, filtered and concentrated. The crude mixture was purified by preparative HPLC (Method 9). This gave 1066 mg (41% of theory) of the title compound.
LC-MS (Method 2): Rt=0.87 min
MS (ESpos): m/z=418.2 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.87 (t, 3H), 1.23-1.70 (m, 6H), 2.54 (s, 3H), 3.39-3.54 (m, 2H), 3.92-4.02 (m, 1H), 4.74 (t, 1H), 5.31 (s, 2H), 6.92 (t, 1H), 6.99 (d, 1H), 7.23 (t, 2H), 7.52 (d, 1H), 7.59 (m, 1H), 8.53 (d, 1H).
Example 129A
8-[(2,6-Difluorobenzyl)oxy]-2-methyl-N-[(2R)-1-oxohexan-2-yl]imidazo[1,2-a]pyridine-3-carboxamide




1.14 g of Dess-Martin periodinane (2.7 mmol, 1.5 equivalents) were initially charged in 25 ml of dichloromethane, and 0.145 ml of pyridine (1.8 mmol, 1 equivalent) and 750 mg of 8-[(2,6-difluorobenzyl)oxy]-N-[(2R)-1-hydroxyhexan-2-yl]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (Example 3A, 1.8 mmol) were added at −20° C. The reaction mixture was stirred at this temperature for 2 h. 1 N aqueous sodium hydroxide solution was added with ice cooling, and the mixture was extracted three times with ethyl acetate. The combined organic phases were washed with saturated aqueous sodium chloride solution, dried over magnesium sulphate, filtered and concentrated. This gave 899 mg (about 70% pure; 90% of theory) of the target compound which were not purified any further.
LC-MS (Method 2): Rt=1.00 min [hydrate: 0.83 min]
MS (ESpos): m/z=416.3 (M+H)+ [hydrate: 434.3 (M+H+)]
1H NMR (400 MHz, DMSO-d6): δ=0.87 (t, 3H), 1.20-1.95 (m, 6H), 2.54 (s, 3H), 4.30-4.38 (m, 1H), 5.31 (s, 2H), 6.92 (t, 1H), 7.01 (d, 1H), 7.23 (t, 2H), 7.59 (m, 1H), 8.20 (d, 1H), 8.57 (d, 1H), 9.10 (s, 1H).
Example 130A
ent-tert-Butyl [2-({[8-(benzyloxy)-2-methylimidazo[1,2-a]pyridin-3-yl]carbonyl}amino)-2-(3,4-difluorophenyl)ethyl]carbamate




ent-tert-Butyl [2-amino-2-(3,4-difluorophenyl)ethyl]carbamate (Starting material 60A, 19.96 mmol, 1.15 equivalents) was added to 4.90 g of 8-(benzyloxy)-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid (Example 30A, 17.36 mmol, 1 equivalent), 6.13 g of (benzotriazol-1-yloxy)bisdimethylaminomethylium fluoroborate (TBTU, 19 mmol, 1.1 equivalents) and 9.5 ml of N-methylmorpholine (8.78 g, 86.8 mmol, 5 equivalents) in 110 ml of DMF. The reaction mixture was stirred at room temperature for 2 h, then poured into 800 ml of water and extracted with 800 ml and 300 ml of ethyl acetate. The organic phase was washed 300 ml of saturated aqueous sodium chloride solution, dried and concentrated to about 15 ml. The residue was triturated with 90 ml of tert-butyl methyl ether, filtered off, washed with 30 ml of tert-butyl methyl ether and then with n-pentane and dried under reduced pressure. This gave 7.30 g (75% of theory) of the title compound.
LC-MS (Method 7): Rt=1.06 min
MS (ESpos): m/z=537.2 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=ppm 1.33 (s, 9H), 2.61 (s, 3H), 5.11-5.21 (m, 1H), 5.28 (s, 2H), 6.84-6.95 (m, 2H), 7.08 (t, 1H), 7.21-7.28 (m, 1H), 7.43 (m, 7H), 8.20 (d, 2H), 8.52 (d, 2H).
Example 131A
ent-tert-Butyl [2-(3,4-difluorophenyl)-2-{[(8-hydroxy-2-methylimidazo[1,2-a]pyridin-3-yl)-carbonyl]amino}ethyl]carbamate




6.90 g of ent-tert-butyl [2-({[8-(benzyloxy)-2-methylimidazo[1,2-a]pyridin-3-yl]carbonyl}amino)-2-(3,4-difluorophenyl)ethyl]carbamate (Example 130A, 12.8 mmol, 1 equivalent) were initially charged in 207 ml of a 1:1:1 mixture of ethanol/THF/dichloromethane, and 0.69 g of 10% palladium on activated carbon were added. The mixture was hydrogenated at RT and standard pressure overnight. 500 ml of dichloromethane were then added, and the reaction mixture was filtered off at 40° C. over silica gel, washed with dichloromethane and dried under reduced pressure. This gave 5.20 g (83% of theory; purity 92%) of the title compound.
LC-MS (Method 2): Rt=0.84 min
MS (ESpos): m/z=447.3 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.33 (s, 9H), 2.63 (s, 3H), 5.10-5.22 (m, 1H), 6.65 (d, 1H), 6.80 (t, 1H), 7.08 (t, 1H), 7.20-7.27 (m, 1H), 7.36-7.54 (m, 2H), 8.18 (d, 1H), 8.43 (d, 1H), [further signals hidden under the solvent peaks].
Example 132A
rac-Benzyl (2-hydroxy-3-methoxypropyl)carbamate




5.0 g (47.6 mmol) of rac-1-amino-3-methoxypropan-2-ol were initially charged in THF (158 ml), and 7.36 ml (52.3 mmol) of benzyl chlorocarbonate, 24.85 ml (142.7 mmol) of N,N-diisopropyl ethyl amine and 1.16 g (9.5 mmol) of 4-dimethylaminopyridine were added. The reaction mixture was stirred at RT for 16 h. 3.7 ml (26.2 mmol) of benzyl chlorocarbonate and then 15 ml of DMF were added, and the reaction solution was stirred at RT overnight. The mixture was concentrated and diluted with ethyl acetate. The mixture was then washed with water, saturated aqueous sodium bicarbonate solution and with saturated aqueous sodium chloride solution. The organic phase was dried over sodium sulphate, filtered off and concentrated. The aqueous phase was concentrated, the residue was taken up in ethyl acetate, the mixture was washed with saturated aqueous sodium bicarbonate solution and with saturated aqueous sodium chloride solution, dried over sodium sulphate, filtered off and concentrated. Both fractions were combined and purified by silica gel chromatography (dichloromethane/methanol gradient: from 100:0 to 10:1). This gave 12.16 g (81% of theory, purity 76%) of the target compound.
LC-MS (Method 7): Rt=0.68 min
MS (ESIpos): m/z=240 (M+H)+.
1H NMR (400 MHz, DMSO-d6): δ=2.90-2.98 (m, 1H), 3.03-3.11 (m, 1H), 3.18-3.28 (m, 5H), 3.58-3.66 (m, 1H), 4.85 (d, 1H), 5.01 (s, 2H), 7.17 (t, 1H), 7.28-7.40 (m, 5H).
Example 133A
Benzyl [(2S)-3-hydroxybutan-2-yl]carbamate 




Under argon, 810 mg of benzyl [(2S)-3-oxobutan-2-yl]carbamate (Example 150A, 3.7 mmol, 1 equivalent) were initially charged in 12 ml of dry THF and 12 ml of methanol, and 208 mg of sodium borohydride (5.5 mmol, 1.5 equivalents) were added at 0° C. After 2 h at 0° C., the mixture was concentrated, water and saturated aqueous sodium bicarbonate solution were added to the residue and the mixture was extracted four times with ethyl acetate. The combined organic phases were washed with saturated aqueous sodium chloride solution, dried over magnesium sulphate and concentrated. This gave 777 mg (90% of theory) of the title compound.
Diastereomer mixture in a ratio of 2:1
Main Diastereomer:
LC-MS (Method 2): Rt=0.78 min
MS (ESpos): m/z=224.1 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.01 (m, 6H), 3.43-3.51 (m, 1H), 4.48 (d, 1H), 5.00 (s, 2H), 7.34-7.38 (m, 5H), [further signals hidden under solvent peaks].
Example 134A
Benzyl [(2R)-3-hydroxybutan-2-yl]carbamate




Under argon, 885 mg of benzyl [(2R)-3-oxobutan-2-yl]carbamate (Example 151A, 4 mmol, 1 equivalent) were initially charged in 13 ml of THF and 13 ml of methanol and, analogously to Example 133A, reacted with 227 mg of sodium borohydride (6 mmol, 1.5 equivalents) and worked up. This gave 830 mg (92% of theory) of the title compound.
Diastereomer mixture in a ratio of 2:1
Main Diastereomer:
LC-MS (Method 2): Rt=0.78 min
MS (ESpos): m/z=224.1 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.01 (m, 6H), 3.43-3.51 (m, 1H), 4.48 (d, 1H), 5.00 (s, 2H), 7.34-7.38 (m, 5H), [further signals hidden under solvent peaks].
Example 135A
rac-Benzyl [3-(3,4-difluorophenoxy)-2-hydroxypropyl]carbamate




1 of rac-1-amino-3-(3,4-difluorophenoxy)propan-2-ol (4.9 mmol, 1 equivalent) was dissolved in 16 ml of THF, and 0.76 ml of benzyl chloroformate (0.9 g, 5.4 mmol, 1.1 equivalents) and then 2.6 ml of N,N-diisopropylethylamine (1.9 g, 14.8 mmol, 3 equivalents) and 0.12 g of 4-dimethylaminopyridine were added. The mixture was stirred at RT for 30 min. 2 ml of DMF were then added, and the mixture was stirred at RT overnight. The mixture was concentrated and the residue was then taken up in ethyl acetate. The organic phase was washed with saturated aqueous sodium bicarbonate solution and saturated aqueous sodium chloride solution, dried over magnesium sulphate, filtered and concentrated. This gave 2.2 g (96% of theory, purity 73%) as a crude product which was reacted without further purification.
LC-MS (Method 2): Rt=1.00 min
MS (ESpos): m/z=338.2 (M+H)+
Example 136A
rac-Benzyl [2-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)-3-methoxypropyl]carbamate 




12.10 g (38.4 mmol, 76%) rac-benzyl (2-hydroxy-3-methoxypropyl)carbamate (Example 132A), 6.79 g (46.1 mmol) of 1H-isoindole-1,3(2H)-dione and 15.12 g (57.7 mmol) triphenylphosphine were initially charged in THF (158 ml). 11.4 ml (57.7 mmol) of diisopropyl azodicarboxylate were added dropwise, and the mixture was then stirred at RT for 10 min. The mixture was then concentrated and the residue purified by silica gel chromatography (cyclohexane/ethyl acetate gradient: from 3:0 to 2:1). The product fractions were concentrated. This gave 14.84 g (97% of theory, purity 93%) of the target compound.
LC-MS (Method 2): Rt=0.95 min.
MS (ESIpos): m/z=369 (M+H)+.
1H NMR (400 MHz, DMSO-d6): δ=3.22 (s, 3H), 3.46 (t, 2H), 3.63 (dd, 1H), 3.80 (t, 1H), 4.37-4.47 (m, 1H), 4.94-4.98 (m, 2H), 7.20-7.35 (m, 5H), 7.56 (t, 1H), 7.81-7.90 (m, 4H).
Example 137A
Benzyl [(2S)-3-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)butan-2-yl]carbamate




Under argon, 0.72 g of benzyl [(2S)-3-hydroxybutan-2-yl]carbamate (Example 133A, 3.3 mmol, 1 equivalent), 0.57 g of 1H-isoindole-1,3(2H)-dione (3.9 mmol, 1.2 equivalents) and 1.3 g of triphenylphosphine (4.9 mmol, 1.5 equivalents) were dissolved in 15 ml of THF, and 1.1 g of di-tert-butyl(E)-diazene-1,2-dicarboxylate (DIAD, 4.9 mmol, 1.5 equivalents) were added at RT. The mixture was stirred at RT overnight, 2 drops of water and Extrelut® were added and the mixture was concentrated. The residue was purified on a silica gel cartridge (Biotage SNAP Cartridge KP-Sil 25 g) (gradient cyclohexane/ethyl acetate from 5% to 100%). The crude product obtained was left in a mixture of 5 ml of methanol and 1 ml of water overnight. The solid obtained was filtered off, washed with a little methanol/water mixture and dried under reduced pressure. The filtrate was purified by preparative HPLC (Method 9). This gave a total of 692 mg (53% of theory, purity 87%) of the title compound (diastereomer mixture in a ratio of about 4:1).
LC-MS (Method 2): Rt=1.02 min
MS (ESpos): m/z=353.2 (M+H)+
Example 138A
Benzyl [(2R)-3-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)butan-2-yl]carbamate




Under argon, 0.82 g of benzyl [(2R)-3-hydroxybutan-2-yl]carbamate (Example 134A, 3.3 mmol, 1 equivalent) were reacted with 0.57 g of 1H-isoindole-1,3(2H)-dione (phthalimide, 3.9 mmol, 1.1 equivalents) and worked up analogously to Example 137A. This gave 1.25 g (72% of theory; purity 75%) of the title compound (diastereomer ratio about 3:1).
LC-MS (Method 2): Rt=1.02 min
MS (ESpos): m/z=353.2 (M+H)+
Example 139A
rac-Benzyl [3-(3,4-difluorophenoxy)-2-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)propyl]carbamate 




2.2 g of rac-benzyl [3-(3,4-difluorophenoxy)-2-hydroxypropyl]carbamate (Example 135A, 6.5 mmol, 1 equivalent) were reacted with 1.2 g of 1H-isoindole-1,3(2H)-dione (phthalimide, 7.8 mmol, 1.2 equivalents) and worked up analogously to Example 137A. This gave 1.78 g (54% of theory; purity 93%) of the title compound.
LC-MS (Method 2): Rt=1.17 min
MS (ESpos): m/z=467.2 (M+H)+
Example 140A
rac-Benzyl (2-amino-3-methoxypropyl)carbamate trifluoroacetate




123 ml (1.43 mol) of methylamine (40% in water) were added to 14.13 g (35.7 mmol, 93% pure) of rac-benzyl [2-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)-3-methoxypropyl]carbamate (Example 136A). The reaction mixture was stirred in a closed vessel at 60° C. for 35 min. The mixture was then concentrated and three times taken up in methanol and re-concentrated, and the residue was purified by preparative RP-HPLC (acetonitrile/water gradient with addition of 0.1% TFA). The product fraction, which was still contained, was purified by RP-HPLC (acetonitrile/water gradient with addition of 0.1% TFA). This gave 9.7 g (69.5% of theory, purity 90%) of the target compound.
LC-MS (Method 7): Rt=0.46 min.
MS (ESIpos): m/z=239 (M+H)+.
1H NMR (400 MHz, DMSO-d6): δ=3.18-3.58 (m, 8H, superimposed by water signal), 5.05 (s, 2H), 7.29-7.40 (m, 5H), 7.48 (t, 1H), 7.82-8.01 (br. s, 2H).
Example 141A
Benzyl [(2S)-3-aminobutan-2-yl]carbamate




600 mg of benzyl [(2S)-3-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)butan-2-yl]carbamate (Example 137A, 1.7 mmol, 1 equivalent) were suspended in 10 ml of methanol, and 2.9 ml of 40% strength aqueous methylamine solution (2.6 g, 34 mmol, 20 equivalent) were added at RT. The mixture was allowed to stand at RT overnight, and Extrelut® was then added and the mixture was concentrated. The residue was purified on a silica gel cartridge (Biotage Isolera SNAP Cartridge KP-Sil 25 g, mobile phase: dichloromethane/methanol from 95:5 to 0:100). This gave 293 mg (43% of theory) of the title compound.
LC-MS (Method 2): Rt=0.49 min
MS (ESpos): m/z=223.2 (M+H)+
Example 142A
Benzyl [(2R)-3-aminobutan-2-yl]carbamate




1.2 g of benzyl [(2R)-3-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)butan-2-yl]carbamate (Example 138A, 3.4 mmol, 1 equivalent) were reacted and worked up analogously to Example 141A. The crude product obtained was, after the silica gel chromatography, re-purified by preparative HPLC (Method 9). This gave 147 mg (19% of theory) of the title compound (diastereomer ratio about 3:1).
LC-MS (Method 2): Rt=0.48 min
MS (ESpos): m/z=223.1 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.90 (d, 3H), 0.99 (d, 3H), 1.4 (br. s, 2H); 2.63-2.80 (m, 1H), 3.30-3.40 (m, 1H; partially superimposed by water signal); 5.01 (s, 2H), 6.95 (d, 1H), 7.25-7.44 (m, 5H).
Example 143A
rac-Benzyl [2-amino-3-(3,4-difluorophenoxy)propyl]carbamate




1.8 g of rac-benzyl [3-(3,4-difluorophenoxy)-2-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)propyl]-carbamate (Example 139A) were dissolved in 25 ml of ethanol, 4.8 ml of 40% strength aqueous methylamine solution (56 mmol, 15 equivalents) were added and the mixture was stirred at 60° C. for 4.5 h. The reaction mixture was concentrated and the residue was then chromatographed on silica gel (Biotage Isolera; mobile phase: dichloromethane/methanol gradient). This gave 600 mg (45% of theory; purity 93%) of the title compound.
LC-MS (Method 2): Rt=0.66 min
MS (ESpos): m/z=337.2 (M+H)+
Starting Material 144A
rac-2-Amino-4,4,4-trifluorobutan-1-ol 




12.9 ml of 2 M lithium borohydride solution in THF (25.8 mmol, 2.5 equivalents) were initially charged in 20 ml of THF, 6.5 ml of chlorotrimethylsilane (51.1 mmol, 5 equivalents) were added and the mixture was stirred at RT for 5 min. 2.0 g of rac-2-amino-4,4,4-trifluorobutanoic acid hydrochloride (10.3 mmol, 1 equivalent) were then added a little at a time, and the mixture was stirred at RT overnight. 20.4 ml of methanol were then added dropwise, and after the addition had ended the mixture was concentrated. 12 ml of a 20% strength aqueous potassium hydroxide solution were added to the residue, and the mixture was extracted three times with dichloromethane. The combined organic solutions were dried over sodium sulphate, filtered and concentrated. This gave 1.58 g (96% of theory; purity 90%) of the title compound.
MS (Method 10): m/z=144.0 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.54 (br. s, 2H), 1.97-2.15 (m, 1H), 2.28-2.45 (m, 1H), 2.84-2.98 (m, 1H), 3.24 (d, 2H), 4.78 (br. s, 1H).
Starting Material 145A
rac-Benzyl (4,4,4-trifluoro-1-hydroxybutan-2-yl)carbamate




At RT, 0.38 ml of 50% strength aqueous potassium carbonate solution (1.7 mmol, 0.68 equivalents) and 0.54 ml of benzyl chloroformate (3.8 mmol, 1.5 equivalents) were added to 400 mg of rac-2-amino-4,4,4-trifluorobutan-1-ol (Example 144A, 2.5 mmol, purity about 90%, 1 equivalent) in 36 ml of 1,4-dioxane, and the mixture was stirred at RT for 2 h. Another 0.11 ml of benzyl chloroformate (0.76 mmol, 0.3 equivalents) and 0.08 ml of 50% strength aqueous potassium carbonate solution (0.35 mmol, 0.14 equivalents) were then added, and the mixture was stirred at RT for a further 30 min. After concentration under reduced pressure, the product was purified by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). The crude product obtained was taken up in ethyl acetate and washed twice with saturated aqueous sodium bicarbonate solution. The aqueous phase was extracted with ethyl acetate and the combined organic phases were dried over sodium sulphate, filtered and concentrated. This gave 490 mg (70% of theory) of the title compound.
LC-MS (Method 2): Rt=0.81 min
MS (ESpos): m/z=278.1 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=2.20-2.38 (m, 1H), 3.19-3.27 (m, 1H), 3.28-3.42 (m, 2H), 3.72-3.83 (m, 1H), 4.96-5.08 (m, 3H), 7.26-7.39 (m, 5H).
Starting material 146A
rac-Benzyl [1-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)-4,4,4-trifluorobutan-2-yl]carbamate




Under argon, 1.58 g of rac-benzyl (4,4,4-trifluoro-1-hydroxybutan-2-yl)carbamate (Example 145A, 5.70 mmol, 1 equivalent), 0.84 g of 1H-isoindole-1,3(2H)-dione (phthalimide, 5.70 mmol, 1 equivalents) and 2.24 g of triphenylphosphine (8.54 mmol, 1.5 equivalents) were dissolved in 28 ml of THF, and 1.84 g of di-tert-butyl(E)-diazene-1,2-dicarboxylate (DIAD, 8.54 mmol, 1.5 equivalents) were added at RT. The mixture was stirred at RT for 30 min and a water/acetonitrile mixture was then added. Purification by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA) gave 1.92 g (79% of theory) of the title compound.
LC-MS (Method 2): Rt=1.08 min
MS (ESpos): m/z=407.2 (M+H)+
Starting material 147A
rac-Benzyl (1-amino-4,4,4-trifluorobutan-2-yl)carbamate trifluoroacetate 




1.86 g of rac-benzyl [1-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)-4,4,4-trifluorobutan-2-yl]-carbamate (Example 146A, 4.35 mmol, 1 equivalent) were dissolved in 15.0 ml of 40% strength aqueous methylamine solution (174 mmol, 40 equivalents) and stirred in a closed flask at 60° C. for 30 min. The reaction mixture was concentrated and the residue was then purified by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). This gave 1.25 g (74% of theory) of the title compound.
LC-MS (Method 2): Rt=0.64 min
MS (ESpos): m/z=277.2 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=2.57-2.71 (m, 1H), 2.76-2.89 (m, 1H), 2.93-3.04 (m, 1H), 4.00-4.14 (m, 1H), 5.02 (d, 1H), 5.09 (d, 1H), 7.27-7.42 (m, 5H), 7.47-7.53 (m, 1H), 7.88-8.08 (br. s, 3H), [further signal hidden under DMSO peak].
Example 148A
ent-Benzyl {(2S)-1-[methoxy(methyl)amino]-1-oxopropan-2-yl}carbamate




Under argon, 2 g of N-[(benzyloxy)carbonyl]-L-alanine (9 mmol, 1 equivalent) were dissolved in 30 ml of THF, and after addition of 1.9 g (11 mmol, 1.2 equivalents) of 2-chloro-4,6-dimethoxy-1,3,5-triazine and 3 ml of 4-methylmorpholine (2.7 g, 27 mmol, 3 equivalents) the mixture was stirred at RT for 1 h. 0.96 g (9.8 mmol, 1.1 equivalents) of N,O-dimethylhydroxylamine hydrochloride was added, and the mixture was stirred at RT overnight. The mixture was then concentrated, ethyl acetate was added to the residue, the mixture was washed with 1 N aqueous hydrochloric acid, saturated aqueous sodium bicarbonate solution and saturated aqueous sodium chloride solution, dried over magnesium sulphate and concentrated and the residue was dried under reduced pressure. This gave 2.25 g (61% of theory; purity 65%) of the title compound.
LC-MS (Method 7): Rt=0.82 min
MS (ESpos): m/z=267.1 (M+H)+
Example 149A
ent-Benzyl {(2R)-1-[methoxy(methyl)amino]-1-oxopropan-2-yl}carbamate




Under argon, 2 g of N-[(benzyloxy)carbonyl]-D-alanine (9 mmol, 1 equivalent) were dissolved in 30 ml of THF, and after addition of 1.9 g (11 mmol, 1.2 equivalents) of 2-chloro-4,6-dimethoxy-1,3,5-triazine and 3 ml of 4-methylmorpholine (2.7 g, 27 mmol, 3 equivalents) and 0.96 g (9.8 mmol, 1.1 equivalents) of N,O-dimethylhydroxylamine hydrochloride the mixture was stirred at RT overnight. The mixture was then concentrated, ethyl acetate was added to the residue, the mixture was washed with 1 N aqueous hydrochloric acid, saturated aqueous sodium bicarbonate solution and saturated aqueous sodium chloride solution, dried over magnesium sulphate and concentrated and the residue was dried under reduced pressure. This gave 2.11 g (64% of theory; purity 61%) of the title compound as a colourless oil.
LC-MS (Method 7): Rt=0.82 min
MS (ESpos): m/z=267.1 (M+H)+
Example 150A
Benzyl [(2S)-3-oxobutan-2-yl]carbamate 




Under argon, 1000 mg of benzyl {(2S)-1-[methoxy(methyl)amino]-1-oxopropan-2-yl}carbamate (Example 148A, 3.8 mmol, 1 equivalent) were dissolved in 19.5 ml of THF and cooled to −78° C. At this temperature, 4 ml of 1.4 M methylmagnesium bromide solution in 1:3 THF/toluene (6 mmol, 1.5 equivalents) were added slowly. The mixture was stirred at −78° C. for 5 min and at RT for 1 h and allowed to stand at RT overnight. 0.27 ml of water was then added with ice cooling, and the mixture was concentrated. The residue was diluted with water and 1 N aqueous hydrochloric acid solution and extracted four times with ethyl acetate. The organic phase was washed with saturated aqueous sodium bicarbonate solution and with saturated aqueous sodium chloride solution, dried over magnesium sulphate, filtered and concentrated. This gave 813 mg (88% of theory; purity 90%) of the title compound.
LC-MS (Method 2): Rt=0.77 min
MS (ESpos): m/z=222.1 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.17 (d, 3H), 2.08 (s, 3H), 4.04 (m, 1H), 5.04 (s, 2H), 7.29-7.39 (m, 5H), 7.67 (d, 1H).
Example 151A
Benzyl [(2R)-3-oxobutan-2-yl]carbamate




Under argon, 1000 mg of benzyl {(2R)-1-[methoxy(methyl)amino]-1-oxopropan-2-yl}carbamate (Example 149A, 3.8 mmol, 1 equivalent) were dissolved in 19.5 ml of THF and cooled to −78° C. At this temperature, 4 ml of 1.4 M methylmagnesium bromide solution in 1:3 THF/toluene (6 mmol, 1.5 equivalents) were added slowly. The mixture was then stirred at −78° C. for 5 min and at RT for 1 h and then allowed to stand at RT overnight. 0.27 ml of water was then added with ice cooling, and the mixture was then concentrated. The residue was diluted with water and 1 N aqueous hydrochloric acid solution and extracted four times with ethyl acetate. The organic phase was washed with saturated aqueous sodium bicarbonate solution and with saturated aqueous sodium chloride solution, dried over magnesium sulphate, filtered and concentrated. This gave 888 mg (97% of theory) of the title compound as a colourless oil.
LC-MS (Method 2): Rt=0.77 min
MS (ESpos): m/z=222.1 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.17 (d, 3H), 2.08 (s, 3H), 3.99-4.10 (m, 1H), 5.03 (s, 2H), 7.27-7.41 (m, 5H), 7.68 (d, 1H).
Example 152A
3-Bromo-N-(4-fluorophenyl)propanamide




5.75 ml of 4-fluoroaniline (6.65 g, 59.88 mmol, 1 equivalent) were initially charged in 65 ml of THF, 33 ml of 2 M trimethylaluminium solution in hexane (65.87 mmol, 1.1 equivalents) were added at −78° C. and the mixture was stirred for 20 min, slowly warming to RT. At −20° C., this solution was added dropwise to a solution of 6.54 ml (10 g, 59.8 mmol, 1 equivalent) of methyl 3-bromopropanoate in 65 ml of THF and then stirred at RT for 3 h. At 0° C., the reaction solution was acidified carefully with 1 N aqueous hydrochloric acid solution and extracted twice with ethyl acetate. The combined organic phases were dried over sodium sulphate, filtered and concentrated. This gave 12.6 g (67% of theory; purity 78%) of the title compound which was reacted further without purification.
LC-MS (Method 7): Rt=0.83 min
MS (ESpos): m/z=248.0 (M+H)+
Example 153A
3-Bromo-N-[4-(trifluoromethyl)phenyl]propanamide 




22.3 ml of 4-(trifluoromethyl)aniline (29 g, 179.6 mmol, 1 equivalent) were reacted with 19.6 ml (30 g, 179.6 mmol, 1 equivalent) of methyl 3-bromopropanoate and worked up analogously to Example 152A. The crude product obtained was then purified on a silica gel column (mobile phase: dichloromethane). This gave 20.3 g (37% of theory) of the title compound.
LC-MS (Method 7): Rt=1.03 min
MS (ESpos): m/z=296.0 (M+H)+
Example 154A
1-(4-Fluorophenyl)azetidin-2-one




12.60 g of 3-bromo-N-(4-fluorophenyl)propanamide (Example 152A, 39.94 mmol, 1 equivalent) were initially charged in 97.1 ml of dichloromethane, 11.19 g of 1,4,7,10,13,16-hexaoxacyclooctadecane (18-crown-6, 42.33 mmol, 1.06 equivalents) and 2.33 g of potassium hydroxide (41.54 mmol, 1.04 equivalents) were added and the mixture was stirred at RT overnight. 0.35 equivalents of 1,4,7,10,13,16-hexaoxacyclooctadecane and 0.35 equivalents of potassium hydroxide were then added and the mixture was stirred at RT overnight. Saturated aqueous ammonium chloride solution was then added and the mixture was extracted three times with ethyl acetate. The combined organic phases were dried over sodium sulphate and filtered, and the filtrate was concentrated and purified [column: Reprosil C18, 10 μm, Spring Column 470×50 mm; acetonitrile/water gradient; flow rate: 200 ml/min; 22° C.; wavelength: 210 nM]. This gave 3.46 g (38% of theory) of the title compound.
LC-MS (Method 7): Rt=0.77 min
MS (ESpos): m/z=166.1 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=3.08 (t, 2H), 3.62 (t, 2H), 7.18-7.28 (m, 2H), 7.33-7.40 (m, 2H).
Example 155A
1-[4-(Trifluoromethyl)phenyl]azetidin-2-one




20.30 g of 3-bromo-N-[4-(trifluoromethyl)phenyl]propanamide (Example 153A, 66.16 mmol, 1 equivalent) were initially charged in 161 ml of dichloromethane, 18.54 g of 1,4,7,10,13,16-hexaoxacyclooctadecane (18-crown-6, 70.13 mmol, 1.06 equivalents) and 3.86 g of potassium hydroxide (68.81 mmol, 1.04 equivalents) were added and the mixture was stirred at RT overnight. Saturated aqueous ammonium chloride solution was added and the mixture was extracted three times with ethyl acetate. The combined organic phases were dried over sodium sulphate and filtered and the filtrate was concentrated. This gave 25.0 g (86% of theory; purity about 49%) of the title compound which was reacted further without purification.
LC-MS (Method 7): Rt=0.94 min
MS (ESpos): m/z=216.1 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=3.14 (t, 2H), 3.70 (t, 2H), 7.51 (d, 2H), 7.73 (d, 2H).
Example 156A
6-Fluoro-2,3-dihydroquinolin-4(1H)-one




500 mg of 1-(4-fluorophenyl)azetidin-2-one (Example 154A, 3.03 mmol, 1 equivalent) were initially charged in 24 ml of dichloromethane, 0.5 ml of trifluoromethanesulphonic acid (909 mg, 6.05 mmol, 2 equivalents) were added at 0° C. and the mixture was stirred at RT for 45 min. Two more times, 0.3 equivalents of trifluoromethanesulphonic acid were added, and after each addition the mixture was stirred for 30 min. With ice cooling, saturated aqueous sodium bicarbonate solution was added carefully, and the reaction mixture was extracted three times with dichloromethane. The combined organic phases were dried over sodium sulphate, filtered and concentrated. This gave 284 mg (57% of theory) of the title compound.
LC-MS (Method 7): Rt=0.69 min
MS (ESpos): m/z=166.1 (M+H)+
Example 157A
6-(Trifluoromethyl)-2,3-dihydroquinolin-4(1H)-on




18.77 g of 1-[4-(trifluoromethyl)phenyl]azetidin-2-one (Example 155A, 42.74 mmol, 1 equivalent) were reacted and worked up analogously to Example 156A. The crude product obtained was purified on a silica gel column (mobile phase: cyclohexane/ethyl acetate gradient: from 7:3 to 5:1). This gave 1.75 g (16% of theory; purity 86%) of the title compound.
LC-MS (Method 2): Rt=0.89 min
MS (ESpos): m/z=216.1 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=2.59 (t, 2H), 3.46-3.55 (m, 2H), 6.90 (d, 1H), 7.53 (dd, 2H), 7.80 (s, 1H).
Example 158A
tert-Butyl 6-fluoro-4-oxo-3,4-dihydroquinoline-1(2H)-carboxylate 




294 mg of 6-fluoro-2,3-dihydroquinolin-4(1H)-one (Example 156A, 1.78 mmol, 1 equivalent) were initially charged in 12.8 ml of THF, 466 mg of di-tert-butyl dicarbonate (2.14 mmol, 1.2 equivalents) and 44 mg of 4-dimethylaminopyridine (0.36 mmol, 0.2 equivalents) were added and the mixture was stirred at RT for 1 h and 15 min. Another 0.2 equivalent of di-tert-butyl dicarbonate was then added, and the mixture was stirred at RT overnight. The reaction solution was diluted with water and extracted three times with ethyl acetate. The combined organic phases were washed with water and with saturated aqueous sodium bicarbonate solution, dried over sodium sulphate, filtered and concentrated. The crude product obtained was purified on a silica gel column (mobile phase: cyclohexane/ethyl acetate 7:3). This gave 394 mg (81% of theory) of the title compound.
LC-MS (Method 5): Rt=2.30 min
MS (ESpos): m/z=266.2 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.50 (s, 9H), 2.77 (t, 2H), 4.08 (t, 2H), 7.44-7.54 (m, 2H), 7.79 (dd, 1H).
Example 159A
tert-Butyl 4-oxo-6-(trifluoromethyl)-3,4-dihydroquinoline-1(2H)-carboxylate




1.75 g of 6-(trifluoromethyl)-2,3-dihydroquinolin-4(1H)-one (Example 157A, 7.0 mmol, 1 equivalent) were reacted and worked up analogously to Example 158A. The crude product was purified on a silica gel column (mobile phase: cyclohexane/ethyl acetate 4:1). This gave 1.72 g (74% of theory) of the title compound.
LC-MS (Method 7): Rt=1.27 min
MS (ESpos): m/z=360.0 (M−H+HCOOH)−
1H NMR (400 MHz, DMSO-d6): δ=1.52 (s, 9H), 2.83 (t, 2H), 4.15 (t, 2H), 7.89-7.95 (m, 1H), 8.01-8.09 (m, 2H).
Example 160A
rac-tert-Butyl 4-amino-6-fluoro-3,4-dihydroquinoline-1(2H)-carboxylate trifluoroacetate




295 mg of tert-butyl 6-fluoro-4-oxo-3,4-dihydroquinoline-1(2H)-carboxylate (Example 158A, 1.11 mmol, 1 equivalent) were initially charged in 3.5 ml of ethanol, 1285 mg of ammonium acetate (16.68 mmol, 15 equivalents) and 84 mg of sodium cyanoborohydride (1.33 mmol, 1.2 equivalents) were added and the mixture was reacted in a microwave oven at 130° C. for 2 min. The reaction solution was concentrated and the residue was taken up in ethyl acetate and washed with water. The organic phase was dried over sodium sulphate, filtered and concentrated. The crude product was purified by preparative HPLC (RP18 column, mobile phase: methanol/water gradient with addition of 0.1% TFA). This gave 185 mg (43% of theory) of the title compound.
LC-MS (Method 7): Rt=0.56 min
MS (ESpos): m/z=267.2 (M+H)+
Bespiel 161A
rac-tert-Butyl 4-amino-6-(trifluoromethyl)-3,4-dihydroquinoline-1(2H)-carboxylate 




1.3 g of tert-butyl 4-oxo-6-(trifluoromethyl)-3,4-dihydroquinoline-1(2H)-carboxylate (Example 159A, 4 mmol, 1 equivalent) were initially charged in 12.6 ml of ethanol, and 4.6 g of ammonium acetate (59.5 mmol, 15 equivalents) and 0.3 g of sodium cyanoborohydride (4.8 mmol, 1.2 equivalents) were added. The reaction mixture was divided and each portion was irradiated in a microwave oven at 130° C. for 1 min. The mixture was then concentrated and the residue was taken up in ethyl acetate and washed with water. The organic phase was dried over sodium sulphate, filtered and concentrated. The crude product obtained was purified on silica gel (mobile phase: dichloromethane/ethyl acetate: 5/1, then dichloromethane/methanol:10/1). This gave 0.84 g (78% of theory) of the title compound.
LC-MS (Method 7): Rt=0.69 min
MS (ESpos): m/z=317.1 (M+H)+
Example 162A
(2,6-Difluorophenyl)(2H2)methanol




2.0 g of methyl 2,6-difluorobenzoate (11.6 mmol, 1 equivalent) were initially charged in 40 ml of THF at 0° C., and at this temperature 23.2 ml of 1 M lithium aluminium deuteride solution in THF (23.2 mmol, 2 equivalents) were added slowly. The mixture was stirred for 45 min, and 1.2 ml of water, 1.2 ml of 2 N aqueous sodium hydroxide solution and 2.3 ml of water were then added in succession. The resulting precipitate was filtered off and washed well with THF. The filtrate was concentrated and the residue was reacted further without purification. This gave 1.77 g (104% of theory) of the title compound.
GC-MS (Method 6): Rt=2.38 min
MS (EIpos): m/z=146.1 (M)+
1H NMR (400 MHz, DMSO-d6): δ=5.20 (s, 1H), 7.02-7.12 (m, 2H), 7.24-7.44 (m, 1H).
Example 163A
rac-Benzyl 1-amino-3-azabicyclo[4.1.0]heptane-3-carboxylate trifluoroacetate




530 mg of rac-3-azabicyclo[4.1.0]heptan-1-amine dihydrochloride (2.86 mmol, 1 equivalent; preparation according to Gensini, M.; Kozhushkov, S. Yufit, D. S.; Howard, J. A. K.; Es-Sayed, M.; De Meijere, A.; Eur. J. Org. Chem., 2002, p. 2499-2507) were dissolved in 11.8 ml of 1,4-dioxane and 14.3 ml of 1 N aqueous sodium hydroxide solution. At 0° C., a solution of 0.3 ml of benzyl chloroformate (366 mg, 2.15 mmol, 0.75 equivalents) in 8.8 ml of 1,4-dioxane was added dropwise over 30 min. The solution was then slowly warmed to RT and stirred at RT for 30 min. The mixture was freed from 1,4-dioxane under reduced pressure and the aqueous phase was extracted three times with ethyl acetate. The combined organic phases were dried over sodium sulphate, filtered and concentrated. The crude product was purified by preparative HPLC (RP18 column, mobile phase: methanol/water gradient with addition of 0.1% TFA/formic acid). This gave 428 mg (41% of theory) of the title compound.
LC-MS (Method 2): Rt=0.55 min
MS (ESpos): m/z=247.2 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.58 (t, 1H), 1.01-1.13 (m, 1H), 1.38-1.47 (m, 1H), 1.49-1.63 (m, 1H), 1.93-2.07 (m, 1H), 2.89-3.10 (m, 1H), 3.91-4.11 (m, 1H), 5.08 (s, 2H), 7.24-7.43 (m, 5H), 8.28 (br. s, 3H), [further signals hidden under solvent peaks].
Example 164A
tert-Butyl [2-(3,3-difluoropyrrolidin-1-yl)ethyl]carbamate 




900 mg of 3,3-difluoropyrrolidine hydrochloride (6.27 mmol, 1 equivalent) were initially charged in 62 ml of acetonitrile, 1475 mg of tert-butyl (2-bromoethyl)carbamate (6.58 mmol, 1.05 equivalent) and then 3.28 ml of N,N-diisopropylethylamine (2.43 g, 18.81 mmol, 3 equivalents) were added and the mixture was stirred at 80° C. overnight. 0.5 equivalent of 3,3-difluoropyrrolidine hydrochloride (450 mg, 3.14 mmol) was then added, and stirring of the reaction solution was continued at 80° C. overnight. The reaction solution was concentrated and purified on a silica gel column (mobile phase: cyclohexane/ethyl acetate gradient: from 5/1 to pure ethyl acetate). This gave 431 mg (28% of theory) of the title compound.
GC-MS (Method 6): Rt=4.81 min
MS (ESpos): m/z=251.0 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.37 (s, 9H), 2.13-2.27 (m, 2H), 2.44 (t, 2H), 2.68 (t, 2H), 2.87 (t, 2H), 2.97-3.05 (m, 2H), 6.76 (t, 1H).
Example 165A
tert-Butyl {2-[(2-methoxyethyl)amino]ethyl}carbamate




1.57 g of tert-butyl (2-bromoethyl)carbamate (7.0 mmol, 0.7 equivalents) were initially charged in 98.5 ml of acetonitrile, 0.87 ml of 2-methoxyethylamine (750 mg, 10.0 mmol, 1 equivalent) and 3.5 ml of N,N-diisopropylethylamine (2.58 g, 20 mmol, 2 equivalents) were added and the mixture was stirred at 80° C. overnight. The mixture was concentrated and the residue was purified on a silica gel column (mobile phase: dichloromethane/methanol gradient: from 50:1 to 30:1 to 10:1, then dichloromethane/2 N ammonia in methanol: 10:1). This gave 1.69 g (99% of theory; purity about 90%) of the title compound.
MS (Method 10, ESpos): m/z=219.1 (M+H)+
Example 166A
tert-Butyl [2-(4,4-difluoropiperidin-1-yl)ethyl]carbamate




0.90 g of 4,4-difluoropiperidine hydrochloride (5.71 mmol, 1 equivalents) were initially charged in 56 ml of acetonitrile, 1.41 g of tert-butyl (2-bromoethyl)carbamate (6.28 mmol, 1.1 equivalents) and 3 ml of N,N-diisopropylethylamine (2.21 g, 17.13 mmol, 3 equivalents) were added and the mixture was stirred at 80° C. overnight. Twice, 0.4 equivalent of tert-butyl (2-bromoethyl)carbamate was added to the reaction solution, and in each case stirring was continued at 80° C. overnight. The mixture was concentrated and purified on a silica gel column (gradient: from cyclohexane/ethyl acetate: 3:1 to ethyl acetate). This gave 1.28 g (62% of theory; purity 73%) of the title compound.
GC-MS (Method 6): Rt=4.87 min
MS (EIpos): m/z=191.1 (M-73)+
MS (Method 10, ESpos): m/z=265.2 (M+H)+
Example 167A
2-(3,3-Difluoropyrrolidin-1-yl)ethanamine dihydrochloride




8.6 ml of a 2 N solution of hydrogen chloride in diethyl ether (17.22 mmol, 10 equivalents) were added to 431 mg of tert-butyl [2-(3,3-difluoropyrrolidin-1-yl)ethyl]carbamate (Example 164A, 1.72 mmol, 1 equivalent), and the reaction mixture was stirred at RT overnight. The solvent was then decanted off, the residue was triturated three times with diethyl ether and the residue obtained in this manner was dried under reduced pressure. This gave 410 mg (99% of theory; purity 93%) of the title compound.
MS (Method 10, ESpos): m/z=151.1 (M−2HCl+H)+
1H NMR (400 MHz, DMSO-d6): δ=3.07-3.23 (m, 2H), 3.28-4.13 (m, 8H), 8.34 (br. s, 4H).
Example 168A
N-(2-Methoxyethyl)ethane-1,2-diamine dihydrochloride




15.5 ml of a 2 N solution of hydrogen chloride in diethyl ether (31 mmol, 10 equivalents) were added to 750 mg of tert-butyl {2-[(2-methoxyethyl)amino]ethyl}carbamate (Example 165A, purity about 90%, 3.1 mmol, 1 equivalent), and the mixture was stirred at RT overnight. The solvent was decanted off, the residue was triturated three times with diethyl ether and the product obtained in this manner was dried under reduced pressure. This gave 482 mg (82% of theory) of the title compound.
MS (Method 10, ESpos): m/z=119 (M−2HCl+H)+
1H NMR (400 MHz, DMSO-d6): δ=3.11-3.24 (m, 6H), 3.30 (s, 3H), 3.61 (t, 2H), 8.19 (br. s, 3H), 9.16 (br. s, 2H).
Example 169A
2-(4,4-Difluoropiperidin-1-yl)ethanamine dihydrochloride




6.9 ml of a 2 N solution of hydrogen chloride in diethyl ether (13.8 mmol, 10 equivalents) were added to 500 mg of tert-butyl [2-(4,4-difluoropiperidin-1-yl)ethyl]carbamate (Example 166A, 1.38 mmol, 1 equivalent), and the mixture was stirred at RT overnight. The solvent was decanted off, the residue was triturated three times with diethyl ether, the diethyl ether was decanted off and the product obtained in this manner was dried under reduced pressure. This gave 448 mg (100% of theory; purity 73%) of the title compound.
MS (Method 10, ESpos): m/z=165.1 (M−2HCl+H)+
Example 170A
ent-tert-Butyl [2-(3,4-difluorophenyl)-2-{[(8-{[(2,6-difluorophenyl)(2H2)methyl]oxy}-2-methylimidazo[1,2-a]pyridin-3-yl)carbonyl]amino}ethyl]carbamate




1222 mg of ent-tert-butyl [2-(3,4-difluorophenyl)-2-{[(8-hydroxy-2-methylimidazo[1,2-a]pyridin-3-yl)carbonyl]amino}ethyl]carbamate (Example 131A, 2.7 mmol, 1 equivalent) were suspended in 16.5 ml of toluene, and 600 mg of (2,6-difluorophenyl)(2H2)methanol (Example 162A, 4.1 mmol, 1.5 equivalents) and 1148 mg of triphenylphosphine (4.4 mmol, 1.6 equivalents) were added at RT. With ice bath cooling, 12 ml of THF and 0.9 ml of diisopropyl azodicarboxylate (942 mg, 4.4 mmol, 1.6 equivalents) were then added, and the mixture was stirred at RT for 2 days and allowed to stand at RT for 2 days. The solution was extracted three times with ethyl acetate and the combined organic phases were washed with saturated aqueous sodium chloride solution, dried over magnesium sulphate, filtered and concentrated. The crude product obtained was pre-separated on a silica gel column (Biotage Isolera SNAP-Cartrige KP-Sil 100 g; mobile phase: cyclohexane/ethyl acetate: from 12% to 100%) and then re-purified by preparative HPLC (Method 9). This gave 255 mg (16% of theory) of the title compound.
LC-MS (Method 2): Rt=1.11 min
MS (ESpos): m/z=575.3 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.32 (s, 9H), 2.58 (s, 3H), 3.37-3.46 (m, 1H), 5.12-5.19 (m, 1H), 6.91 (t, 1H), 7.02 (d, 1H), 7.09 (t, 1H), 7.19-7.27 (m, 3H), 7.36-7.51 (m, 2H), 7.54-7.65 (m, 1H), 8.22 (d, 1H), 8.55 (d, 1H), [further signal hidden under solvent peak].
The examples shown in Table 10A were prepared analogously to Example 34A by reacting 8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid from Example 3A with the appropriate commercially available amines under the reaction conditions described in the General Working Procedure 2.
Exemplary work-up of the reaction mixture: water was added to the reaction solution and the precipitate formed was stirred for another 0.5-1.0 h, filtered off, washed with water and dried under high vacuum overnight. Alternatively, the precipitate or the reaction mixture was purified further directly by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA) and dried under high vacuum overnight. If required, the product fractions were taken up in ethyl acetate or dichloromethane and washed twice with saturated aqueous sodium bicarbonate solution. The aqueous phase was extracted twice with ethyl acetate or dichloromethane. The combined organic phases were dried over sodium sulphate, filtered and concentrated.









TABLE 10A






IUPAC name/structure



Example
(yield)
Analytical data







171A
tert-butyl {4-[({8-[(2,6-difluorobenzyl)oxy]-2-
LC-MS (Method 1): Rt = 1.16 min



methylimidazo[1,2-a]pyridin-3-yl}carbonyl)-
MS (ESpos): m/z = 503.1 (M + H)+



amino]-2-methylbutan-2-yl}carbamate




trifluoroacetate



 










 



(89% of theory)



172A
rac-tert-butyl 4-[({8-[(2,6-difluorobenzyl)oxy]-
LC-MS (Method 7): Rt = 1.16 min



2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)-
MS (ESpos): m/z = 567.2 (M + H)+



amino]-6-fluoro-3,4-dihydroquinoline-1(2H)-




carboxylate



 










 



(75% of theory)



173A
rac-tert-butyl 4-[({8-[(2,6-difluorobenzyl)oxy]-
LC-MS (Method 2): Rt = 1.07 min



2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)-
MS (ESpos): m/z = 549.3 (M + H)+



amino]-3,4-dihydroisoquinoline-2(1H)-




carboxylate



 










 



(72% of theory)



174A
rac-tert-butyl 4-[({8-[(2,6-difluorobenzyl)oxy]-
LC-MS (Method 7): Rt = 1.28 min



2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)-
MS (ESpos): m/z = 617.2 (M + H)+



amino]-6-(trifluoromethyl)-3,4-




dihydroquinoline-1(2H)-carboxylate



 










 



(54% of theory)



175A
8-[(2,6-difluorobenzyl)oxy]-N-(2-hydroxyethyl)- 2-methylimidazo[1,2-a]pyridine-3-carboxamide   



LC-MS (Method 7): Rt = 0.57 min MS (ESpos): m/z = 362.1 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 3.35-3.41 (m, 2 H), 3.50-3.59 (m, 2 H), 4.77 (t, 1 H), 5.30 (s, 2 H), 6.93 (t, 1 H), 7.01 (d, 1 H), 7.24 (t, 2 H), 7.54- 7.65 (m, 1 H), 7.78 (t, 1 H), 8.63 (d, 1 H), [further signal hidden under DMSO peak].


 



(79% of theory)



176A
rac-benzyl 1-[({8-[(2,6-difluorobenzyl)oxy]-2- methylimidazo[1,2-a]pyridin-3-yl}carbonyl)- amino]-3-azabicyclo[4.1.0]heptane-3- carboxylate   



LC-MS (Method 2): Rt = 1.00 min MS (ESpos): m/z = 547.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 0.53-0.64 (m, 1 H), 0.97 (dd, 1 H), 1.29-1.38 (m, 1 H), 1.56-1.67 (m, 1 H), 2.04-2.16 (m, 1 H), 2.45 (s, 3 H), 3.05-3.21 (m, 1 H), 3.42-3.68 (m, 2 H), 4.11 (d, 1 H), 5.08 (s, 2 H), 5.30 (s, 2 H), 6.90-6.97 (m, 1 H), 7.02 (d, 1 H), 7.23 (t, 2 H), 7.27-7.43 (m, 5 H), 7.51-7.64 (m, 1 H), 8.26 (br. s, 1 H), 8.62 (d, 1 H).


 



(84% of theory)



177A
8-[(2,6-difluorobenzyl)oxy]-N-[(2R)-1-
LC-MS (Method 1): Rt = 0.74 min



hydroxypropan-2-yl]-2-methylimidazo[1,2-a]-
MS (ESpos): m/z = 376.1 (M + H)+



pyridine-3-carboxamide



 










 



(93% of theory)



178A
8-[(2,6-difluorobenzyl)oxy]-N-[(2S)-1-
LC-MS (Method 1): Rt = 0.74 min



hydroxypropan-2-yl]-2-methylimidazo[1,2-a]-
MS (ESpos): m/z = 376.1 (M + H)+



pyridine-3-carboxamide



 










 



(91% of theory)









Example 179A
tert-Butyl {4-[({6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]-2-methylbutan-2-yl}carbamate trifluoroacetate




75 mg of 6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid (Example 16A, 0.21 mmol, 1 equivalent), 82 mg of (benzotriazol-1-yloxy)bisdimethylaminomethylium fluoroborate (TBTU, 0.26 mmol, 1.2 equivalents) and 108 mg of 4-methylmorpholine (1.06 mmol, 5 equivalents) were initially charged in 1.45 ml of DMF. After 10 min at RT, 56 mg (0.23 mmol, 1.1 equivalents) of tert-butyl-(4-amino-2-methylbutan-2-yl)carbamate hydrochloride were added and the mixture was stirred at RT overnight. Water and trifluoroacetic acid were added and the reaction solution was purified by preparative HPLC (method: RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). This gave 118 mg (84% of theory) of the title compound.
LC-MS (Method 1): Rt=1.43 min
MS (ESpos): m/z=537.0 (M−TFA+H)+
The examples shown in Table 11A were prepared analogously to Example 179A by reacting 6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid (Example 16A) with the appropriate commercially available or self-prepared amines under the reaction conditions described in the General Working Procedure 2:









TABLE 11A






IUPAC name/structure



Example
(yield)
Analytical data







180A
rac-tert-butyl 4-[({6-chloro-8-[(2,6-
LC-MS (Method 7): Rt = 1.38 min



difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-
MS (ESpos): m/z = 583.1 (M + H)+



pyridin-3-yl}carbonyl)amino]-3,4-




dihydroisoquinoline-2(1H)-carboxylate



 










 



(70% of theory; purity 90%)









Example 181A
tert-Butyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridin-3-yl}carbonyl)-amino]ethyl}carbamate trifluoroacetate




60 mg of 8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylic acid (Example 21A, 0.18 mmol, 1 equivalent), 70 mg of (benzotriazol-1-yloxy)bisdimethylaminomethylium fluoroborate (TBTU, 0.22 mmol, 1.2 equivalents) and 73 mg of 4-methylmorpholine (0.72 mmol, 4 equivalents) were initially charged in 1.3 ml of DMF. After 10 min at RT, 32 mg of tert-butyl (2-aminoethyl)carbamate (0.2 mmol, 1.1 equivalents) were added and the mixture was stirred at RT overnight. Water and trifluoroacetic acid were added and the reaction solution was purified by preparative HPLC (method: RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). This gave 93 mg (87% of theory) of the title compound.
LC-MS (Method 7): Rt=0.88 min
MS (ESpos): m/z=475.2 (M+H)+
The examples shown in Table 12A were prepared analogously to Example 181A by reacting 8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylic acid (Example 21A) with the appropriate commercially available or self-prepared amines under the reaction conditions described in the General Working Procedure 2:









TABLE 12A






IUPAC name/structure



Example
(yield)
Analytical data







182A
tert-butyl {4-[({8-[(2,6-difluorobenzyl)oxy]-2,6- dimethylimidazo[1,2-a]pyridin-3-yl}carbonyl)- amino]-2-methylbutan-2-yl}carbamate trifluoroacetate   



LC-MS (Method 2): Rt = 1.01 min MS (ESpos): m/z = 517.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.23 (s, 6 H), 1.37 (s, 9 H), 1.84-1.96 (m, 2 H), 2.39 (s, 3 H), 3.24-3.33 (m, 2 H), 5.39 (s, 2 H), 6.51 (br. s, 1 H), 7.26 (t, 2 H), 7.41 (br. s, 1 H), 7.55- 7.68 (m, 1 H), 8.20 (br. s, 1 H), 8.53 (s, 1 H), [further signal hidden under solvent peaks].


 



(53% of theory)



183A
tert-butyl (2R)-2-{[({8-[(2,6-
LC-MS (Method 7): Rt = 1.07 min



difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-
MS (ESpos): 529.3 m/z = (M + H)+



a]pyridin-3-yl}-




carbonyl)amino]methyl}piperidin-1-carboxylate




trifluoroacetate 1)



 










 



(39% of theory)





1) Coupling agent: HATU






The examples shown in Table 13A were prepared analogously to Example 34A by reacting the appropriate carboxylic acids with the appropriate commercially available amines under the reaction conditions described in the General Working Procedure 2.
Exemplary work-up of the reaction mixture: water was added to the reaction solution and the precipitate formed was stirred for another 0.5-1.0, filtered off, washed with water and dried under high vacuum overnight. Alternatively, the precipitate or the reaction mixture was purified further directly by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA) and dried under high vacuum overnight. If required, the product fractions were taken up in ethyl acetate or dichloromethane and washed twice with saturated aqueous sodium bicarbonate solution. The aqueous phase was extracted twice with ethyl acetate or dichloromethane. The combined organic phases were dried over sodium sulphate, filtered and concentrated.









TABLE 13A






IUPAC name/structure



Example
(yield)
Analytical data







184A
benzyl {(2R)-3-[({8-[(2,6-difluorobenzyl)oxy]-2- methylimidazo[1,2-a]pyridin-3-yl}carbonyl)- amino]butan-2-yl}carbamate   



LC-MS (Method 7): Rt = 0.94 min MS (ESpos): m/z = 523.2 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.11 (d, 3 H), 1.16 (d, 3 H), 2.47 (s, 3 H), 3.63-3.87 (m, 1 H), 4.06-4.15 (m, 1 H), 4.94-5.05 (m, 2 H), 5.30 (s, 2 H), 6.88-6.94 (m, 1 H), 7.00 (d, 1 H), 7.19-7.38 (m, 8 H), 7.54-7.64 (m, 2 H), 8.51-8.58 (m, 1 H).


 



(68% of theory; purity 96%




diastereomer mixture about 3:1)



185A
rac-tert-butyl {3-[({8-[(2,6-difluorobenzyl)oxy]- 2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)- amino]-2-methylpropyl}carbamate   



LC-MS (Method 2): Rt = 0.96 min MS (ESpos): m/z = 489.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 0.86 (d, 3 H), 1.38 (s, 9 H), 1.78-1.91 (m, 1 H), 2.82-3.00 (m, 2 H), 3.13- 3.26 (m, 2 H), 5.30 (s, 2 H), 6.87- 6.96 (m, 2 H), 7.01 (d, 1 H), 7.24 (t, 2 H), 7.54-7.64 (m, 1 H), 7.83 (t, 1 H), 8.63 (d, 1 H), [further signal hidden under the DMSO peak].


 



(61% of theory; purity 96%)



186A
rac-benzyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2-
LC-MS (Method 7): Rt = 0.90 min



methylimidazo[1,2-a]pyridin-3-yl}-
MS (ESpos): m/z = 539.2 (M + H)+



carbonyl)amino]-3-methoxypropyl}carbamate 1)



 










 



(56% of theory; purity 65%)



187A
rac-benzyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2-
LC-MS (Method 7): Rt = 1.13 min



methylimidazo[1,2-a]pyridin-3-
MS (ESpos): m/z = 637.2 (M + H)+



yl}carbonyl)amino]-3-(3,4-




difluorophenoxy)propyl}carbamate 1)



 










 



(37% of theory; purity 77%)



188A
tert-butyl {3-[({8-[(2,6-difluorobenzyl)oxy]-2- methylimidazo[1,2-a]pyridin-3-yl}- carbonyl)amino]-2,2-dimethylpropyl} carbamate   



LC-MS (Method 7): Rt = 1.05 min MS (ESpos): m/z = 503.2 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 0.84 (s, 6 H), 1.39 (s, 9 H), 2.58 (s, 3 H), 2.80-2.86 (m, 2 H), 3.13 (d, 2 H), 5.31 (s, 2 H), 6.89-7.05 (m, 3 H), 7.17-7.32 (m, 2 H), 7.54-7.64 (m, 1 H), 7.81 (t, 1 H), 8.64 (d, 1 H).


 



(72% of theory.; purity 84%)



189A
rac-benzyl {1-[({8-[(2,6-difluorobenzyl)oxy]-2-
LC-MS (Method 2): Rt = 0.96 min



methylimidazo[1,2-a]pyridin-3-yl}-
MS (ESpos): m/z = 577.2 (M + H)+



carbonyl)amino]-4,4,4-trifluorobutan-2-yl}-




carbamate trifluoroacetate



 










 



(96% of theory)



190A
rac-benzyl {1-[({8-[(2,6-difluorobenzyl)oxy]-
LC-MS (Method 2): Rt = 0.97 min



2,6-dimethylimidazo[1,2-a]pyridin-3-yl}-
MS (ESpos): m/z = 591.3 (M + H)+



carbonyl)amino]-4,4,4-trifluorobutan-2-




yl}carbamate trifluoroacetate



 










 



(89% of theory; purity 100%)





1) The amine was employed in excess since the exact purity was not known.






Example 191A
Benzyl {(2S)-3-[({6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]butan-2-yl}carbamate




164 mg of 6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid (Example 16A, 0.47 mmol, 1 equivalent) were dissolved in 1.4 ml of DMF, 145 mg of benzyl [(2S)-3-aminobutan-2-yl]carbamate (Example 141A, 0.65 mmol, 1.4 equivalents), 230 mg of O-(7-azabenzotriazol-1-yl)-N,N,N′N′-tetramethyluronium hexafluorophosphate (HATU, 0.6 mmol, 1.3 equivalents) and 180.7 mg of N,N-diisopropylethylamine (0.23 ml, 1.4 mmol, 3 equivalents) were added and the mixture was stirred at RT overnight. A drop of water was then added and the precipitated solid was filtered off and dried under reduced pressure. This gave 160 mg (53% of theory; purity 86%) of the title compound as colourless crystals.
LC-MS (Method 1): Rt=2.50 min
MS (ESpos): m/z=557.1 (M+H)+
Example 192A
tert-Butyl (2S)-2-{[({8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]methyl}pyrrolidin-1-carboxylate trifluoroacetate 




75 mg of 8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylic acid (Example 21A, 0.23 mmol, 1 equivalent), 90 mg of O-(7-azabenzotriazol-1-yl)-N,N,N′N′-tetramethyluronium hexafluorophosphate (HATU, 0.24 mmol, 1.05 equivalents) and 88 mg of N,N-diisopropylethylamine (0.12 ml, 0.68 mmol, 3 equivalents) were initially charged in 1.4 ml of DMF and stirred at RT for 20 min. 50 mg (0.25 mmol, 1.1 equivalents) of tert-butyl (2S)-2-(aminomethyl)pyrrolidine-1-carboxylate were then added, and the mixture was stirred at RT overnight. The reaction solution was then diluted with water/TFA and purified by preparative HPLC (method: RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). This gave 143 mg (99% of theory; purity 98%) of the title compound.
LC-MS (Method 2): Rt=1.02 min
MS (ESpos): m/z=515.3 (M−TFA+H)+
Example 193A
tert-Butyl (2R)-2-{[({8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]methyl}pyrrolidin-1-carboxylate trifluoroacetate 




75 mg of 8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylic acid (Example 21A, 0.23 mmol, 1 equivalent), 90 mg of O-(7-azabenzotriazol-1-yl)-N,N,N′N′-tetramethyluronium hexafluorophosphate (HATU, 0.24 mmol, 1.05 equivalents) and 88 mg of N,N-diisopropylethylamine (0.12 ml, 0.68 mmol, 3 equivalents) were initially charged in 1.4 ml of DMF and stirred at RT for 20 min. 50 mg (0.25 mmol, 1.1 equivalents) of tert-butyl (2R)-2-(aminomethyl)pyrrolidine-1-carboxylate were then added, and the mixture was stirred at RT overnight. The reaction solution was diluted with water/TFA and purified by preparative HPLC (method: RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). This gave 108 mg (76% of theory; purity 100%) of the title compound.
LC-MS (Method 2): Rt=1.02 min
MS (ESpos): m/z=515.3 (M−TFA+H)+
Example 194A
8-[(2,6-Difluorobenzyl)oxy]-2-methyl-N-(2-oxoethyl)imidazo[1,2-a]pyridine-3-carboxamide 




Under argon, 1.65 g 1,1,1-triacetoxy-1lambda5,2-benziodoxol-3(1H)-one (Dess-Martin periodinane, 3.9 mmol, 1.5 equivalents) were initially charged in 20 ml of dichloromethane. At −25° C., a solution of 1 g of 8-[(2,6-difluorobenzyl)oxy]-N-(2-hydroxyethyl)-2-methylimidazo-[1,2-a]pyridine-3-carboxamide (Example 175A, 2.6 mmol, 1 equivalent) in 32 ml of dichloromethane was slowly added dropwise. The reaction mixture was stirred overnight, warming to RT. The reaction solution was then diluted with about 160 ml of ethyl acetate and washed three times with 1 N aqueous sodium hydroxide solution. The organic phase was washed with saturated aqueous sodium chloride solution until neutral, dried over sodium sulphate, filtered and concentrated. This gave 879 mg (47% of theory; purity about 50%) of the title compound which was reacted further without purification.
LC-MS (Method 2): Rt=0.56 min
MS (ESneg): m/z=358 (M−H)−
Example 195A
8-[(2,6-Difluorobenzyl)oxy]-2-methyl-N-[(2R)-1-oxopropan-2-yl]imidazo[1,2-a]pyridine-3-carboxamide 




Analogously to Example 194A, 500 mg of 8-[(2,6-difluorobenzyl)oxy]-N-[(2R)-1-hydroxypropan-2-yl]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (Example 177A, 1.33 mmol) were oxidized with 847 mg (2.0 mmol) of Dess-Martin periodinane with addition of 0.11 ml of pyridine (105 mg, 1.33 mmol) and worked up. This gave 440 mg (53% of theory; purity 60%) of the title compound which was reacted further without purification.
LC-MS (Method 2): Rt=0.64 min
MS (ESneg): m/z=372.1 (M−H)+
Example 196A
8-[(2,6-Difluorobenzyl)oxy]-2-methyl-N-[(2S)-1-oxopropan-2-yl]imidazo[1,2-a]pyridine-3-carboxamide




Analogously to Example 194A, 500 mg of 8-[(2,6-difluorobenzyl)oxy]-N-[(2S)-1-hydroxypropan-2-yl]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (Example 178A, 1.33 mmol, 1 equivalent) were oxidized with Dess-Martin periodinane with addition of 0.11 ml of pyridine (105 mg, 1.33 mmol, 1 equivalent) and worked up. This gave 439 mg (53% of theory; purity 60%) of the title compound which was reacted further without purification.
LC-MS (Method 5): Rt=1.49 min
MS (ESneg): m/z=372.1 (M−H)+
Example 197A
ent-tert-Butyl {2-(3,4-difluorophenyl)-2-[({8-[(2-fluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridin-3-yl}carbonyl)amino]ethyl}carbamate




200 mg of ent-tert-butyl [2-(3,4-difluorophenyl)-2-{[(8-hydroxy-2-methylimidazo[1,2-a]pyridin-3-yl)carbonyl]amino}ethyl]carbamate (Example 131A, 0.45 mmol, 1 equivalent), 93 mg of 2-fluorobenzyl bromide (0.49 mmol, 1.1 equivalents) and 321 mg of caesium carbonate (0.99 mmol, 2.2 equivalents) in 10 ml of DMF were stirred at RT overnight. 150 ml of water were then added, and the mixture was stirred at RT for 15 min. The precipitated product was filtered off and dried under reduced pressure. This gave 190 mg (79% of theory; purity 91%) of the title compound.
LC-MS (Method 1): Rt=1.06 min
MS (ESpos): m/z=555.3 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.33 (s, 9H), 2.58 (s, 3H), 3.37-3.47 (m, 2H), 5.10-5.22 (m, 1H), 5.32 (s, 2H), 6.89 (t, 1H), 6.97 (d, 1H), 7.08 (t, 1H), 7.20-7.34 (m, 3H), 7.37-7.52 (m, 3H), 7.61 (t, 1H), 8.22 (d, 1H), 8.53 (d, 1H).
The examples shown in Table 14A were prepared analogously to Example 197A by reacting ent-tert-butyl [2-(3,4-difluorophenyl)-2-{[(8-hydroxy-2-methylimidazo[1,2-a]pyridin-3-yl)carbonyl]-amino}ethyl]carbamate (Example 131A) with the appropriate commercially available benzyl bromides:









TABLE 14A






IUPAC name/structure



Example
(yield)
Analytical data







198A
ent-tert-butyl {2-[({8-[(2,3-difluorobenzyl)oxy]-2- methylimidazo[1,2-a]pyridin-3- yl}carbonyl)amino]-2-(3,4- difluorophenyl)ethyl}carbamate   



LC-MS (Method 1): Rt = 1.33 min MS (ESpos): m/z = 573.1 (M + H)+ 1H NMR (400 MHz DMSO-d6): δ = 1.33 (s, 9 H), 2.60 (s, 3 H), 3.37- 3.47 (m, 2 H), 5.11-5.20 (m, 1 H), 5.39 (s, 2 H), 6.90 (t, 1 H), 6.98 (d, 1 H), 7.09 (t, 1 H), 7.21-7.33 (m, 2 H), 7.37-7.55 (m, 4 H), 8.23 (d, 1 H) 8.54 (d, 1 H).


 



(86% of theory; purity 85%)



199A
ent-tert-butyl {2-(3,4-difluorophenyl)-2-[({2- methyl-8-[(2,3,6-trifluorobenzyl)oxy]imidazo[1,2- a]pyridin-3-yl}carbonyl)amino]ethyl}carbamate   



LC-MS (Method 1): Rt = 1.33 min MS (ESpos): m/z = 591.1 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.32 (s, 9 H), 2.58 (s, 3 H), 3.37- 3.46 (m, 2 H), 5.11-5.20 (m, 1 H), 5.35 (s, 2 H), 6.92 (t, 1 H), 7.02 (d, 1 H), 7.08 (t, 1 H), 7.19-7.33 (m, 2 H), 7.35-7.52 (m, 2 H), 7.60-7.72 (m, 1 H), 8.22 (d, 1 H), 8.56 (d, 1 H).


 



(94% of theory; purity 100%)



200A
ent-tert-butyl {2-(3,4-difluorophenyl)-2-[({2- methyl-8-[(2,4,6-trifluorobenzyl)oxy]imidazo[1,2- a]pyridin-3-yl}carbonyl)amino]ethyl}carbamate   



LC-MS (Method 1): Rt = 1.33 min MS (ESpos): m/z = 591.1 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.32 (s, 9 H), 2.58 (s, 3 H), 3.37- 3.46 (m, 2 H), 5.11-5.20 (m, 1 H), 5.27 (s, 2 H), 6.92 (t, 1 H), 7.01 (d, 1 H), 7.09 (t, 1 H), 7.21-7.27 (m, 1 H), 7.30-7.50 (m, 4 H), 8.21 (d, 1 H), 8.55 (d, 1 H).


 



(76% of theory; purity 90%)



201A
ent-tert-butyl {2-[({8-[(2-chloro-6- fluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin- 3-yl}carbonyl)amino]-2-(3,4- difluorophenyl)ethyl}carbamate   



LC-MS (Method 1): Rt = 1.36 min MS (ESpos): m/z = 589.1 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.33 (s, 9 H), 2.58 (s, 3 H), 3.36- 3.46 (m, 2 H), 5.11-5.20 (m, 1 H), 5.33 (s, 2 H), 6.92 (t, 1 H), 7.01- 7.12 (m, 2 H), 7.21-7.27 (m, 1 H), 7.33-7.51 (m, 4 H), 7.54-7.62 (m, 1 H), 8.21 (d, 1 H), 8.54 (d, 1 H).


 



(85% of theory; purity 90%)









Example 202A
ent-tert-Butyl 4-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)-amino]-6-fluoro-3,4-dihydroquinoline-1(2H)-carboxylate (enantiomer A) 




198 mg of Example 172A were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 25% isohexane, 75% ethanol, flow rate: 15 ml/min; 40° C., detection: 220 nm].
Yield: Enantiomer A: 76 mg (99% ee)
Enantiomer A: Rt=4.20 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm, mobile phase: 25% isohexane, 75% ethanol, flow rate: 1 ml/min; 40° C., detection: 220 nm].
Example 203A
ent-tert-Butyl 4-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)-amino]-6-fluoro-3,4-dihydroquinoline-1(2H)-carboxylate (enantiomer B) 




198 mg of Example 172A were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 25% isohexane, 75% ethanol, flow rate: 15 ml/min; 40° C., detection: 220 nm].
Yield enantiomer B: 76 mg (99% ee)
Enantiomer B: Rt=9.13 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm, mobile phase: 25% isohexane, 75% ethanol, flow rate: 1 ml/min; 40° C., detection: 220 nm].
Example 204A
ent-tert-Butyl 4-[({6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]-3,4-dihydroquinoline-1(2H)carboxylate (enantiomer A) 




190 mg of Example 180A were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak OZ-H, 5 μm, 250×20 mm, mobile phase: 30% isohexane, 70% ethanol+0.2% diethylamine, flow rate: 15 ml/min; 40° C., detection: 220 nm].
Yield: Enantiomer A: 64 mg (99% ee)
Enantiomer A: Rt=4.84 min [Daicel Chiralpak OZ-H, 5 μm, 250×4.6 mm, mobile phase: 30% isohexane, 70% ethanol+0.2% diethylamine, flow rate: 1 ml/min; 40° C., detection: 220 nm].
Example 205A
ent-tert-Butyl 4-[({6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]-3,4-dihydroquinoline-1(2H)carboxylate (enantiomer B) 




190 mg of Example 180A were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak OZ-H, 5 μm, 250×20 mm, mobile phase: 30% isohexane, 70% ethanol+0.2% diethylamine, flow rate: 15 ml/min; 40° C., detection: 220 nm].
Yield: Enantiomer B: 65 mg (99% ee)
Enantiomer B: Rt=5.62 min [Daicel Chiralpak OZ-H, 5 μm, 250×4.6 mm, mobile phase: 30% isohexane, 70% ethanol+0.2% diethylamine, flow rate: 1 ml/min; 40° C., detection: 220 nm].
Example 206A
ent-tert-Butyl 4-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)-amino]-3,4-dihydroquinoline-1(2H)-carboxylate (enantiomer A) 




188 mg of Example 173A were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak OZ-H, 5 μm, 250×20 mm, mobile phase: 25% isohexane, 75% ethanol+0.2% diethylamine, flow rate: 15 ml/min; 40° C., detection: 220 nm].
Yield enantiomer A: 80 mg (99% ee)
Enantiomer A: Rt=7.44 min [Daicel Chiralpak OZ-H, 5 μm, 250×4.6 mm, mobile phase: 25% isohexane, 75% ethanol+0.2% diethylamine, flow rate: 1.0 ml/min; 40° C., detection: 220 nm].
Example 207A
ent-tert-Butyl 4-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)-amino]-3,4-dihydroquinoline-1(2H)-carboxylate (enantiomer B) 




188 mg of Example 173A were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak OZ-H, 5 μm, 250×20 mm, mobile phase: 25% isohexane, 75% ethanol+0.2% diethylamine, flow rate: 15 ml/min; 40° C., detection: 220 nm].
Yield enantiomer B: 81 mg (99% ee)
Enantiomer B: 10.05 min [Daicel Chiralpak OZ-H, 5 μm, 250×4.6 mm, mobile phase: 25% isohexane, 75% ethanol+0.2% diethylamine, flow rate: 1.0 ml/min; 40° C., detection: 220 nm].
Example 208A
ent-tert-Butyl 4-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)-amino]-6-(trifluoromethyl)-3,4-dihydroquinoline-1(2H)-carboxylate (enantiomer A) 




149 mg of Example 174A were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% isopropanol, flow rate: 20 ml/min; 25° C., detection: 230 nm].
Yield enantiomer A: 56 mg (100% ee)
Enantiomer A: Rt=3.90 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% isopropanol; flow rate 1.0 ml/min; 25° C.; detection: 220 nm].
Example 209A
ent-tert-Butyl 4-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)-amino]-6-(trifluoromethyl)-3,4-dihydroquinoline-1(2H)-carboxylate (enantiomer B) 




149 mg of Example 174A were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% isopropanol, flow rate: 20 ml/min; 25° C., detection: 230 nm].
Yield enantiomer B: 55 mg (100% ee)
Enantiomer B: Rt=7.60 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% isopropanol; flow rate 1.0 ml/min; 25° C.; detection: 220 nm].
Example 210A
ent-Benzyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)-amino]-3-methoxypropyl}carbamate (enantiomer A) 




290 mg of Example 186A were dissolved in 3.5 ml of ethanol and separated into the enantiomers on a chiral phase [column: Daicel Chiralpak OD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% ethanol, flow rate: 20 ml/min; 25° C., detection: 220 nm].
Yield enantiomer A: 58 mg (100% ee)
Enantiomer A: Rt=5.47 min [Daicel Chiralpak OD-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% ethanol; flow rate 1.0 ml/min; 30° C.; detection: 220 nm].
1H NMR (400 MHz, DMSO-d6): δ=2.55 (s, 3H; obscured by DMSO signal), 3.20-3.35 (m, 2H), 3.25 (s, 3H), 3.39-3.49 (m, 2H), 4.20-4.31 (m, 1H), 5.00 (s, 2H), 5.31 (s, 2H), 6.90 (t, 1H), 7.00 (d, 1H), 7.20-7.30 (m, 7H), 7.40 (t, 1H), 7.52 (d, 1H), 7.54-7.64 (m, 1H), 8.60 (d, 1H).
Example 211A
ent-Benzyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)-amino]-3-methoxypropyl}carbamate (enantiomer B) 




290 mg of Example 186A were dissolved in 3.5 ml of ethanol and separated into the enantiomers on a chiral phase [column: Daicel Chiralpak OD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% ethanol, flow rate: 20 ml/min; 25° C., detection: 220 nm].
Yield enantiomer B: 53 mg (95% ee)
Enantiomer B: Rt=6.998 min [Daicel Chiralpak OD-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% ethanol; flow rate 1.0 ml/min; 30° C.; detection: 220 nm].
Example 212A
ent-Benzyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)-amino]-3-(3,4-difluorophenoxy)propyl}carbamate (enantiomer B) 




350 mg of Example 187A were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AH-H, 5 μm, 250×20 mm, mobile phase: 25% isohexane, 75% ethanol, flow rate: 15 ml/min; 45° C., detection: 220 nm].
Yield enantiomer B: 110 mg (99% ee)
Enantiomer B: Rt=7.66 min [Daicel Chiralcel OD-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% ethanol; flow rate 1.0 ml/min; 40° C.; detection: 220 nm].
Example 213A
ent-tert-Butyl {3-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)-amino]-2-methylpropyl}carbamate (enantiomer A)




192 mg of Example 185A were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 70% isohexane, 15% ethanol, 15% isopropanol, flow rate: 25 ml/min; 40° C., detection: 210 nm].
Yield enantiomer A: 68 mg (100% ee)
Enantiomer A: Rt=8.65 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm, mobile phase: 70% isohexane, 15% ethanol, 15% isopropanol, flow rate: 1.5 ml/min; 30° C., detection: 220 nm].
Example 214A
ent-tert-Butyl {3-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)-amino]-2-methylpropyl}carbamate (enantiomer B)




195 mg of Example 185A were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 70% isohexane, 15% ethanol, 15% isopropanol, flow rate: 25 ml/min; 40° C., detection: 210 nm].
Yield enantiomer B: 79 mg (87% ee)
Enantiomer B: 9.24 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm, mobile phase: 70% isohexane, 15% ethanol, 15% isopropanol, flow rate: 1.5 ml/min; 30° C., detection: 220 nm].
Example 215A
ent-Benzyl {1-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)-amino]-4,4,4-trifluorobutan-2-yl}carbamate (enantiomer A) 




280 mg of Example 189A were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AZ-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% ethanol, flow rate: 18 ml/min; 40° C., detection: 210 nm].
Yield enantiomer A: 80 mg (100% ee)
Enantiomer A: Rt=8.79 min [Daicel Chiralpak AZ-H, 5 μm, 250×4.6 mm, mobile phase: 50% isohexane, 50% ethanol, flow rate: 1.0 ml/min; 30° C., detection: 220 nm].
Example 216A
ent-Benzyl {1-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)-amino]-4,4,4-trifluorobutan-2-yl}carbamate (enantiomer B) 




280 mg of Example 189A were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AZ-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% ethanol, flow rate: 18 ml/min; 40° C., detection: 210 nm].
Yield enantiomer B: 94 mg (99% ee)
Enantiomer B: Rt=11.63 min [Daicel Chiralpak AZ-H, 5 μm, 250×4.6 mm, mobile phase: 50% isohexane, 50% ethanol, flow rate: 1.0 ml/min; 30° C., detection: 220 nm].
Example 217A
ent-Benzyl {1-[({8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridin-3-yl}carbonyl)-amino]-4,4,4-trifluorobutan-2-yl}carbamate (enantiomer A) 




260 mg of Example 190A were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% isopropanol, flow rate: 15 ml/min; 40° C., detection: 220 nm].
Yield enantiomer A: 85 mg (>99% ee)
Enantiomer A: Rt=4.81 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm, mobile phase: 50% isohexane, 50% isopropanol+0.2% TFA+1% water, flow rate: 1.0 ml/min; 45° C., detection: 220 nm].
Example 218A
ent-Benzyl {1-[({8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridin-3-yl}carbonyl)-amino]-4,4,4-trifluorobutan-2-yl}carbamate (enantiomer B) 




260 mg of Example 190A were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% isopropanol, flow rate: 15 ml/min; 40° C., detection: 220 nm].
Yield enantiomer B: 92 mg (99% ee)
Enantiomer B: Rt=6.59 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm, mobile phase: 50% isohexane, 50% isopropanol+0.2% TFA+1% water, flow rate: 1.0 ml/min; 45° C., detection: 220 nm].
Example 219A
1-(Azetidin-3-yl)pyrrolidine dihydrochloride




1.00 g (4.42 mmol) of tert-butyl 3-(pyrrolidin-1-yl)azetidin-1-carboxylate was initially charged in 5.3 ml of 1,4-dioxane, 5.3 ml of 4 N hydrochloric acid in 1,4-dioxane were added and the mixture was stirred at RT overnight. The reaction mixture was then concentrated, foamed with dichloromethane and dried under high vacuum. This gave 950 mg (99% of theory; purity 92%) of the title compound.
1H NMR (400 MHz, DMSO-d6): δ=1.82-1.94 (m, 2H), 1.94-2.05 (m, 2H), 2.89-3.00 (m, 2H), 4.07-4.19 (m, 2H), 4.28-4.42 (m, 3H), 9.11 (br. s, 1H), 9.49 (br. s, 1H), 12.33 (br. s, 1H).
Example 220A
tert-Butyl {2-[3-(pyrrolidin-1-yl)azetidin-1-yl]ethyl}carbamate




595 mg of 1-(azetidin-3-yl)pyrrolidine dihydrochloride (Example 219A, 2.75 mmol, purity about 92%, 1 equivalent) were reacted in 3 batches. To obtain the free base, the 1-(azetidin-3-yl)pyrrolidine dihydrochloride was passed over a StratoSpheresTM SPE column. To this end, the column was initially moistened with 1 ml of methanol. 1-(Azetidin-3-yl)pyrrolidine dihydrochloride, dissolved in 3 ml of methanol, was then passed over the column and the column was rinsed with 3 ml of methanol. The solution obtained was concentrated (the column retains about 0.9 mmol of salt). The free base was then initially charged in 26.8 ml of acetonitrile, 656 mg of 2-(Boc-amino)ethyl bromide (2.9 mmol, 1.05 equivalents) and 1.45 ml of N,N-diisopropylethylamine (8.25 mmol, 3 equivalents) were added and the mixture was stirred at 80° C. overnight. The reaction mixture was concentrated and purified by silica gel chromatography (mobile phase: cyclohexane/ethyl acetate 5:1; dichloromethane/methanol 10:1; dichloromethane/methanol 4:1 and dichloromethane/1 N ammonia in methanol 4:1). This gave 463 mg (67% of theory) of the title compound.
DCI-MS (Method 4): m/z=270.2 (M+H)+
Example 221A
2-[3-(Pyrrolidin-1-yl)azetidin-1-yl]ethanamine dihydrochloride




460 mg of tert-butyl {2-[3-(pyrrolidin-1-yl)azetidin-1-yl]ethyl}carbamate (Example 220A, 1.7 mmol, 1 equivalent) were initially charged in 8.54 ml of 2 N hydrochloric acid in diethyl ether and 1 ml of dioxane, and the mixture was stirred at RT overnight. The precipitated solid was filtered off, washed with diethyl ether and dried under reduced pressure. This gave 390 mg (94% of theory) of the title compound.
DCI-MS (Method 4): m/z=170.2 (M+H)+
Example 222A
1-(Aminomethyl)cyclobutanamine




750 mg of 1-aminocyclobutanecarbonitrile (7.8 mmol, 1 equivalent) were initially charged in 16.5 ml of THF, under argon, 23.4 ml of 1 N lithium aluminium hydride solution in THF (23.4 mmol, 3 equivalents) were added dropwise at 0° C. and the mixture was stirred at RT for 3.5 h. Subsequently, 0.8 ml of water, 0.8 ml of 2 N aqueous sodium hydroxide solution and 1.6 ml of water were added to the reaction mixture in succession. The solid formed was filtered off and washed with methanol. The filtrate was concentrated. This gave 1980 mg (76% of theory; assumed purity 30%) of the title compound which was reacted further without purification.
FIA-MS (Method 10, ESpos): m/z=101 (M+H)+
Example 223A
rac-4,4,4-Trifluorobutane-1,2-diamine dihydrochloride




130 mg of rac-benzyl (1-amino-4,4,4-trifluorobutan-2-yl)carbamate trifluoroacetate (Example 147 A, 0.33 mmol, 1 equivalent) were initially charged in 8.4 ml of methanol, under argon, 35 mg (0.03 mmol) of 10% palladium on activated carbon were added and the mixture was hydrogenated at RT and atmospheric pressure overnight. The mixture was then filtered through a Millipore® filter, 0.33 ml of 2 N hydrochloric acid in diethyl ether (0.66 mmol, 2 equivalents) was added and the mixture was concentrated. This gave 72 mg (100% of theory) of the title compound.
FIA-MS (Method 10, ESpos): m/z=143.0 (M−2HCl+H)+
Example 224A
rac-3-Isopropoxypropane-1,2-diamine dihydrochloride




Under argon, 218 mg (0.71 mmol, 87% pure) rac-benzyl (2-amino-3-isopropoxypropyl)carbamate from Example 76A were initially charged in ethanol (5.0 ml), and 76 mg (0.07 mmol) of 10% palladium on activated carbon and 2.2 ml (21.36 mmol) of cyclohexene were added. The reaction mixture was stirred under reflux overnight. The mixture was then filtered through a Millipore® filter, the filter cake was washed with ethanol, 0.7 ml (1.42 mmol) of 2 M hydrogen chloride in diethyl ether were added to the filtrate and the mixture was concentrated and dried under high vacuum. This gave 190 mg (99% of theory, purity 76%) of the target compound.
DCI-MS (Method 4): m/z=133 (M−2HCl+H)+
Example 225A
3-(Dibenzylamino)oxetane-3-carbonitrile




0.63 ml (10.8 mmol) of oxetan-3-one and 3.6 ml (27.1 mmol) of trimethylsilyl cyanide were added to 10.4 ml (54.1 mmol) of dibenzylamine in 72 ml of acetic acid. The reaction mixture was then stirred at RT overnight. The mixture was then concentrated, the residue was dissolved in water/diethyl ether and the aqueous phase was extracted twice with diethyl ether. The combined organic phases were washed twice with saturated aqueous sodium bicarbonate solution, dried over sodium sulphate, filtered and concentrated. The residue was purified by silica gel chromatography (cyclohexane/ethyl acetate from 40:1 to 30:1). This gave 2.39 g (77% of theory, purity 97%) of the target compound.
LC-MS (Method 13): Rt=2.53 min.
MS (ESIpos): m/z=279 (M+H)+.
1H NMR (400 MHz, DMSO-d6): δ=3.49 (s, 4H), 4.29 (d, 2H), 4.37 (d, 2H), 7.26-7.39 (m, 10H).
Example 226A
3-(Aminomethyl)oxetane-3-amine dihydrochloride




585 mg (2.07 mmol) of 3-(aminomethyl)-N,N-dibenzyloxetane-3-amine [synthesis described in: US2008/103183 A1, 2008; p. 48] were initially charged in ethanol (29.2 ml), and 441 mg (0.41 mmol) of 10% palladium on activated carbon and 6.3 ml (62.2 mmol) of cyclohexene were added. The reaction mixture was stirred under reflux for 8 h. The mixture was then filtered through a Millipore® filter, the filter cake was washed with methanol, 2.6 ml (5.2 mmol) of 2 M hydrogen chloride in diethyl ether were added to the filtrate and the mixture was concentrated and dried under high vacuum. This gave 423 mg (87% of theory, purity 75%) of the target compound.
DCI-MS (Method 4): m/z=103 (M−2HCl+H)+
Example 227A
rac-tert-Butyl {1-[({6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]-3-methylbutan-2-yl}carbamate 




200 mg (0.57 mmol) of 6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid Example 16A, 191 mg (0.60 mmol) of HATU and 0.19 ml (1.70 mmol) of 4-methylmorpholine in DMF (3.6 ml) were stirred at RT for 20 min. 126 mg (0.62 mmol) of rac-tert-butyl (1-amino-3-methylbutan-2-yl)carbamate were then added and the reaction mixture was stirred at RT overnight. Water/TFA were then added and the mixture was purified by preparative RP-HPLC (acetonitrile/water gradient with addition of 0.1% TFA). The product fractions were concentrated and the residue was taken up in dichloromethane and washed twice with saturated aqueous sodium bicarbonate solution. The aqueous phase was extracted twice with dichloromethane and the combined organic phases were dried over sodium sulphate, filtered off and concentrated. This gave 264 mg (87% of theory, purity 100%) of the target compound.
LC-MS (Method 2): Rt=1.23 min.
MS (ESIpos): m/z=537 (M+H)+.
1H NMR (400 MHz, DMSO-d6): δ=0.86 (d, 3H), 0.91 (d, 3H), 1.32 (s, 9H), 1.66-1.78 (m, 1H), 2.47 (s, 3H, signal partially obscured by DMSO peak), 3.20-3.29 (m, 1H), 3.38-3.46 (m, 1H), 3.49-3.60 (m, 1H), 5.34 (s, 2H), 6.62 (d, 1H), 7.19 (d, 1H), 7.22-7.29 (m, 2H), 7.56-7.66 (m, 1H), 7.81 (t, 1H), 8.74 (d, 1H).
Example 228A
ent-tert-Butyl {1-[({6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]-3-methylbutan-2-yl}carbamate (enantiomer A) 




260 mg of Example 227A were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% ethanol, flow rate: 20 ml/min; 40° C., detection: 220 nm].
Enantiomer A:
Yield: 124 mg (99% ee)
Rt=3.84 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% isopropanol; flow rate 1.0 ml/min; 40° C.; detection: 220 nm].
Example 229A
ent-tert-Butyl {1-[({6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]-3-methylbutan-2-yl}carbamate (enantiomer B) 




260 mg of Example 227A were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% ethanol, flow rate: 20 ml/min; 40° C., detection: 220 nm].
Enantiomer B:
Yield: 122 mg (99% ee)
Rt=5.97 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% isopropanol; flow rate 1.0 ml/min; 40° C.; detection: 220 nm].
Example 230A
rac-tert-Butyl {1-[({8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]-3-methylbutan-2-yl}carbamate 




200 mg (0.60 mmol) of 8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylic acid from Example 21A, 203 mg (0.63 mmol) of HATU and 0.20 ml (1.81 mmol) of 4-methylmorpholine were initially charged in DMF (3.8 ml), the mixture was stirred at RT for 20 min, 134 mg (0.66 mmol) of rac-tert-butyl (1-amino-3-methylbutan-2-yl)carbamate were added and the reaction mixture was stirred at RT overnight. Water/TFA were added and the mixture was purified by preparative RP-HPLC (acetonitrile/water gradient with addition of 0.1% TFA). The product fractions were concentrated and the residue was taken up in dichloromethane and washed twice with saturated aqueous sodium bicarbonate solution. The aqueous phase was extracted twice with dichloromethane and the combined organic phases were dried over sodium sulphate, filtered off and concentrated. This gave 262 mg (84% of theory, purity 100%) of the target compound.
LC-MS (Method 2): Rt=1.03 min.
MS (ESIpos): m/z=517 (M+H)+.
1H NMR (400 MHz, DMSO-d6): δ=0.86 (d, 3H), 0.90 (d, 3H), 1.33 (s, 9H), 1.68-1.78 (m, 1H), 2.31 (s, 3H), 2.46 (s, 3H), 3.18-3.28 (m, 1H), 3.38-3.46 (m, 1H), 3.50-3.59 (m, 1H), 5.28 (s, 2H), 6.63 (d, 1H), 6.91 (s, 1H), 7.20-7.28 (m, 2H), 7.55-7.64 (m, 1H), 7.67 (t, 1H), 8.47 (s, 1H).
Example 231A
ent-tert-Butyl {1-[({8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]-3-methylbutan-2-yl}carbamate (enantiomer A) 




260 mg of Example 230A were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak IA, 5 μm, 250×20 mm, mobile phase: 50% acetonitrile, 50% tert-butyl methyl ether, flow rate: 20 ml/min; 25° C., detection: 220 nm].
Enantiomer A:
Yield: 89 mg (100% ee)
Rt=4.04 min [Daicel Chiralpak IA, 5 μm, 250×4.6 mm; mobile phase: 50% acetonitrile, 50% tert-butyl-methyl ether; flow rate 1.0 ml/min; 30° C.; detection: 220 nm].
Example 232A
ent-tert-Butyl {1-[({8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]-3-methylbutan-2-yl}carbamate (enantiomer B) 




260 mg of Example 230A were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak IA, 5 μm, 250×20 mm, mobile phase: 50% acetonitrile, 50% tert-butyl methyl ether, flow rate: 20 ml/min; 25° C., detection: 220 nm].
Enantiomer B:
Yield: 93 mg (100% ee)
Rt=6.02 min [Daicel Chiralpak IA, 5 μm, 250×4.6 mm; mobile phase: 50% acetonitrile, 50% tert-butyl methyl ether; flow rate 1.0 ml/min; 30° C.; detection: 220 nm].
Example 233A
rac-tert-Butyl {1-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)-amino]-3-methylbutan-2-yl}carbamate 




Preparation and purification of the title compound were carried out analogously to Example 230A. Starting with 200 mg (0.63 mmol) of 8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid from Example 3A and 140 mg (0.69 mmol) of rac-tert-butyl (1-amino-3-methylbutan-2-yl)carbamate, 215 mg (68% of theory, purity 100%) of the target compound were obtained.
LC-MS (Method 2): Rt=1.02 min.
MS (ESIpos): m/z=503 (M+H)+.
1H NMR (400 MHz, DMSO-d6): δ=0.86 (d, 3H), 0.90 (d, 3H), 1.33 (s, 9H), 1.68-1.78 (m, 1H), 2.54 (s, 3H, obscured by DMSO signal), 3.19-3.28 (m, 1H), 3.39-3.46 (m, 1H), 3.50-3.59 (m, 1H), 5.30 (s, 2H), 6.64 (d, 1H), 6.93 (t, 1H), 7.01 (d, 1H), 7.20-7.28 (m, 2H), 7.54-7.63 (m, 1H), 7.70 (t, 1H), 8.63 (d, 1H).
Example 234A
ent-tert-Butyl {1-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)-amino]-3-methylbutan-2-yl}carbamate (enantiomer A) 




210 mg of Example 233A were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak IA, 5 μm, 250×20 mm, mobile phase: 20% acetonitrile, 80% tert-butyl methyl ether, flow rate: 20 ml/min; 25° C., detection: 230 nm].
Enantiomer A:
Yield: 89 mg (100% ee)
Rt=4.69 min [Daicel Chiralpak IA, 5 μm, 250×4.6 mm; mobile phase: 20% acetonitrile, 80% tert-butyl methyl ether; flow rate 1.0 ml/min; 30° C.; detection: 220 nm].
Example 235A
ent-tert-Butyl {1-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)-amino]-3-methylbutan-2-yl}carbamate (enantiomer B) 




210 mg of Example 233A were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak IA, 5 μm, 250×20 mm, mobile phase: 20% acetonitrile, 80% tert-butyl methyl ether, flow rate: 20 ml/min; 25° C., detection: 230 nm].
Enantiomer B:
Yield: 73 mg (100% ee)
Rt=7.29 min [Daicel Chiralpak IA, 5 μm, 250×4.6 mm; mobile phase: 20% acetonitrile, 80% tert-butyl methyl ether; flow rate 1.0 ml/min; 30° C.; detection: 220 nm].
Example 236A
3-(Benzyloxy)-5-bromopyridine-2-amine




200 g (1 mol) of 2-amino-3-benzyloxypyridine were initially charged in 4 l of dichloromethane, and a solution of 62 ml (1.2 mol) of bromine in 620 ml of dichloromethane was added at 0° C. over a period of 30 min. After the addition had ended, the reaction solution was stirred at 0° C. for 60 min. About 4 l of saturated aqueous sodium bicarbonate solution were then added to the mixture. The organic phase was separated off and concentrated. The residue was purified by silica gel column chromatography (petroleum ether:ethyl acetate 6:4) and the product fractions were concentrated. This gave 214 g (77% of theory) of the title compound.
LC-MS (Method 2): Rt=0.92 min
MS (ESpos): m/z=279 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=5.16 (s, 2H), 5.94-6.00 (m, 2H), 7.26-7.29 (m, 1H), 7.31-7.36 (m, 1H), 7.37-7.43 (m, 2H), 7.47-7.52 (m, 2H), 7.57-7.59 (m, 1H).
Example 237A
Ethyl 8-(benzyloxy)-6-bromo-2-methylimidazo[1,2-a]pyridine-3-carboxylate




Under argon, 200 g (0.72 mol) of 3-(benzyloxy)-5-bromopyridine-2-amine, 590 g (3.58 mol) of ethyl 2-chloroacetoacetate and 436 g of 3 Å molecular sieve were suspended in 6 l of ethanol and stirred at reflux for 72 h. The reaction mixture was filtered off through silica gel and concentrated. The residue was purified by silica gel chromatography (petroleum ether:ethyl acetate 9:1, then 6:4) and the product fractions were concentrated. This gave 221 g (79% of theory) of the target compound.
LC-MS (Method 7): Rt=1.31 min
MS (ESpos): m/z=389 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.36 (t, 3H), 2.58 (s, 3H), 4.32-4.41 (m, 2H), 5.33 (s, 2H), 7.28-7.32 (m, 1H), 7.36-7.47 (m, 3H), 7.49-7.54 (m, 2H), 8.98 (d, 1H).
Example 238A
Ethyl 8-(benzyloxy)-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylate




Under argon, 105 g (270 mmol) of ethyl 8-(benzyloxy)-6-bromo-2-methylimidazo[1,2-a]pyridine-3-carboxylate from Example 237A were suspended in 4.2 l of 1,4-dioxane, 135.4 g (539 mmol, purity 50%) of trimethylboroxine, 31.2 g (27 mmol) of tetrakis(triphenylphosphine)palladium(0) and 78.3 g (566 mmol) of potassium carbonate were added in succession and the mixture was stirred under reflux for 8 h. The reaction mixture, cooled to RT, was filtered off from the precipitate over silica gel and the filtrate was concentrated. The residue was dissolved in dichloromethane and purified by silica gel chromatography (dichloromethane:ethyl acetate=9:1). This gave 74 g (84.6% of theory; purity 100%) of the target compound.
LC-MS (Method 7): Rt=1.06 min
MS (ESpos): m/z=325 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.35 (t, 3H), 2.34 (br. s, 3H), 2.56 (s, 3H), 4.31-4.38 (m, 2H), 5.28 (br. s, 2H), 6.99-7.01 (m, 1H), 7.35-7.47 (m, 3H), 7.49-7.54 (m, 2H), 8.68-8.70 (m, 1H).
Example 239A
Ethyl 8-hydroxy-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylate 




74 g (228 mmol) of ethyl 8-(benzyloxy)-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylate from Example 238A were initially charged in 1254 ml of dichloromethane and 251 ml of ethanol, and 20.1 g 10% palladium on activated carbon (moistened with water 50%) were added under argon. The reaction mixture was hydrogenated overnight at RT and atmospheric pressure. The reaction mixture was filtered off through silica gel and concentrated. The crude product was purified by silica gel chromatography (dichloromethane:methanol=95:5). This gave 50.4 g (94% of theory) of the target compound.
DCI-MS: (Method 4)→(ESpos): m/z=235.2 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.35 (t, 3H), 2.27 (s, 3H), 2.58 (s, 3H), 4.30-4.38 (m, 2H), 6.65 (d, 1H), 8.59 (s, 1H), 10.57 (br. s, 1H).
Example 240A
rac-tert-Butyl 2-{[({8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]methyl}-3,4-dihydroquinoline-1(2H)-carboxylate




120 mg (0.36 mmol) of 8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylic acid Example 21A, 139 mg (0.43 mmol) of TBTU and 0.20 ml (1.81 mmol) of 4-methylmorpholine in DMF (2.3 ml) were stirred at RT for 10 min, 119 mg (0.40 mmol) of rac-tert-butyl 2-(aminomethyl)-3,4-dihydroquinoline-1(2H)-carboxylate hydrochloride were added and the reaction mixture was stirred at RT overnight. Water was added, and the mixture was stirred at RT for 30 min. The solid formed was filtered off, washed with water and dried under high vacuum. This gave 182 mg (85% of theory, purity 98%) of the target compound.
LC-MS (Method 7): Rt=1.13 min.
MS (ESIpos): m/z=577 (M+H)+.
1H NMR (400 MHz, DMSO-d6): δ=1.38 (s, 9H), 1.64-1.75 (m, 1H), 2.10-2.20 (m, 1H), 2.22 (s, 3H), 2.30 (s, 3H), 2.56-2.62 (m, 1H), 2.66-2.76 (m, 1H), 3.09-3.19 (m, 1H), 3.55-3.64 (m, 1H), 4.63-4.72 (m, 1H), 5.27 (s, 2H), 6.90 (s, 1H), 6.99 (t, 1H), 7.05-7.15 (m, 2H), 7.19-7.28 (m, 2H), 7.37 (d, 1H), 7.54-7.64 (m, 1H), 7.80 (t, 1H), 8.40 (s, 1H).
Example 241A
2-Methyl-4-phenyl-2-(trifluoromethyl)-1,3-oxazolidine (diastereomers)




45 g (328.0 mmol) of rac-2-amino-2-phenylethanol and 8.24 g (32.8 mmol) of pyridinium p-toluolsulphonate were added to 55.13 g (492.0 mmol) of 1,1,1-trifluoroacetone in toluene (1.35 l). The reaction mixture was boiled under reflux on a water separator for 16 h. The mixture was cooled to 0° C. and the solid formed was filtered off and dried under high vacuum. This gave 68.6 g (77% of theory, purity 85%) of the target compound.
LC-MS (Method 2): Rt=0.99 min
MS (ESIpos): m/z=232 (M+H)+.
1H NMR (400 MHz, DMSO-d6): δ=1.54 (s, 3H), 3.56 (t, 1H), 3.81 (d, 1H), 4.28 (t, 1H), 4.35-4.43 (m, 1H), 7.29-7.47 (m, 5H).
Example 242A
3,3,3-Trifluoro-2-[(2-hydroxy-1-phenylethyl)amino]-2-methylpropionitrile (diastereomers)




Under argon, 52.8 g (228.3 mmol) of 2-methyl-4-phenyl-2-(trifluoromethyl)-1,3-oxazolidine (diastereomers) Example 241A were initially charged in dichloromethane (2 l) and cooled to 0° C. 42.85 ml (342.5 mmol) of trimethylsilyl cyanide and 42.1 ml (342.5 mmol) of boron trifluoride/diethyl ether complex were added slowly and the mixture was stirred at RT for 16 h. The reaction solution was then poured into 1.5 l of saturated sodium bicarbonate solution. Another 400 g of sodium bicarbonate were then added, and the solution was adjusted to pH 10 with conc. aqueous sodium hydroxide solution. The aqueous solution was extracted three times with 500 ml of dichloromethane and the combined organic phases were dried over sodium sulphate, filtered off and concentrated. This gave 56.8 g (96% of theory, 2 diastereomers) of the target compound.
LC-MS (Method 2): Rt=0.89 min and 0.93 min.
MS (ESIneg): m/z=303 (M−H+ HCOOH)−.
Example 243A
2-[(3-Amino-1,1,1-trifluoro-2-methylpropan-2-yl)amino]-2-phenylethanol (diastereomers)




31 g (120.0 mmol) of 3,3,3-trifluoro-2-[(2-hydroxy-1-phenylethyl)amino]-2-methylpropionitrile Example 242A were initially charged in tert-butyl methyl ether (3.1 l), the mixture was cooled to 0° C., 18.25 g (480.2 mmol) of lithium aluminium hydride were added and the reaction mixture was stirred at RT for 16 h. The mixture was then cooled to 0° C. and initially quenched with 24 ml of water, and 24 ml of 15% strength aqueous potassium hydroxide solution and 48 ml of water were then added. The mixture formed was filtered through silica gel and washed with tert-butyl methyl ether. The organic phase was separated off, dried over sodium sulphate, filtered and concentrated. This gave 29.2 g (83% of theory, purity 89%) of the target compound.
LC-MS (Method 2): Rt=0.52 min
MS (ESIpos): m/z=263 (M+H)+.
Example 244A
tert-Butyl {3,3,3-trifluoro-2-[(2-hydroxy-1-phenylethyl)amino]-2-methylpropyl}carbamate (diastereomers)




29.1 ml (209.8 mmol) of triethylamine and 23.98 g (109.9 mmol) of di-tert-butyl dicarbonate (dissolved in 286 ml of THF) were added to 26.2 g (99.9 mmol) of 2-[(3-amino-1,1,1-trifluoro-2-methylpropan-2-yl)amino]-2-phenylethanol (diastereomers) Example 243A in THF (500 ml). The reaction mixture was stirred at RT for 16 h. The mixture was then concentrated and taken up in in each case 500 ml of saturated aqueous sodium bicarbonate solution and ethyl acetate. The phases were separated and the organic phase was dried over sodium sulphate, filtered off and concentrated. This gave 39.80 g (110% of theory) of the target compound which was used without further purification for the next step.
FIA-MS (Method 10, ESpos): m/z=363 (M+H)+
Example 245A
rac-tert-Butyl (2-amino-3,3,3-trifluoro-2-methylpropyl)carbamate 




Under argon, 39 g (107.6 mmol) of tert-butyl {3,3,3-trifluoro-2-[(2-hydroxy-1-phenylethyl)amino]-2-methyl-propyl}carbamate Example 244A were initially charged in ethanol (700 ml), and 5.44 g (53.8 mmol) of palladium(II) hydroxide (20% on activated carbon, moistened with water about 60%) were added. The reaction mixture was hydrogenated at atmospheric pressure for 16 h. The mixture was then filtered through silica gel and concentrated. The residue was purified by silica gel chromatography (cyclohexane/ethyl acetate gradient: from 9/1 to 6/4). This gave 15.8 g (61% of theory) of the target compound.
FIA-MS (Method 10, ESpos): m/z=243 (M+H)+
1H NMR (400 MHz, CDCl3): δ=1.22 (s, 3H), 1.45 (s, 9H), 3.13-3.23 (m, 1H), 3.37-3.48 (m, 1H), 4.89 (br. s, 1H).
Example 246A
rac-3,3,3-Trifluoro-2-methylpropane-1,2-diamine dihydrochloride




188 ml of 4 M hydrogen chloride in dioxane were added to 15 g (61.9 mmol) of rac-tert-butyl (2-amino-3,3,3-trifluoro-2-methylpropyl)carbamate from Example 245A in dioxane (188 ml). The reaction mixture was stirred at RT for 16 h and then concentrated and kept under argon. This gave 14.4 g (108% of theory) of the target compound which was not purified any further.
FIA-MS (Method 10, ESpos): m/z=143 (M−2HCl+H)+
1H NMR (400 MHz, D2O): δ=1.40 (s, 3H), 3.21-3.31 (m, 2H).
Example 247A
ent-Benzyl (2-amino-3-methoxypropyl)carbamate (enantiomer A) 




10 g of Example 140A were separated into the enantiomers by preparative separation on a chiral phase after the TFA of the sample had been removed with the silica gel-based sorbent “Bond Elut PSA” (manufacturer: Agilent) [column: Daicel Chiralpak AY-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% isopropanol+0.2% diethylamine, flow rate: 15 ml/min; 40° C., detection: 220 nm].
Enantiomer A:
Yield: 2.17 g (96% ee)
Rt=5.79 min [Daicel Chiralpak AY-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% isopropanol+0.2% diethylamine; flow rate 1.0 ml/min; 40° C.; detection: 220 nm].
Example 248A
ent-Benzyl (2-amino-3-methoxypropyl)carbamate (enantiomer B)




10 g of Example 140A were separated into the enantiomers by preparative separation on a chiral phase after the TFA of the sample had been removed with the silica gel-based sorbent “Bond Elut PSA” (manufacturer: Agilent) [column: Daicel Chiralpak AY-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% isopropanol+0.2% diethylamine, flow rate: 15 ml/min; 40° C., detection: 220 nm].
Enantiomer B:
Yield: 2.07 g (94% ee)
Rt=7.26 min [Daicel Chiralpak AY-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% isopropanol+0.2% diethylamine; flow rate 1.0 ml/min; 40° C.; detection: 220 nm].
Example 249A
ent-3-Methoxypropane-1,2-diamine dihydrochloride (enantiomer A)




Under argon, 750 mg (3.15 mmol) of ent-benzyl (2-amino-3-methoxypropyl)carbamate (enantiomer A) Example 247A were initially charged in ethanol (22 ml), and 335 mg (0.32 mmol) of 10% palladium on activated carbon and 9.6 ml (94.42 mmol) of cyclohexene were added. The reaction mixture was stirred under reflux for 7 h. 335 mg (0.32 mmol) of 10% palladium on activated carbon were then added and the mixture was stirred under reflux for a further two days. The reaction mixture, cooled to RT, was filtered through a Milipore filter and the filter cake was washed with ethanol. 3.2 ml (6.3 mmol) of 2 N hydrogen chloride in diethyl ether were added to the filtrate and the mixture was concentrated and dried under high vacuum. This gave 440 mg (79% of theory) of the target compound.
1H NMR (400 MHz, DMSO-d6): δ=3.03-3.11 (m, 2H), 3.32 (s, 3H), 3.55-3.64 (m, 3H), 8.31-8.69 (m, 4H).
Example 250A
ent-3-Methoxypropane-1,2-diamine dihydrochloride (enantiomer B)




Preparation and purification of the title compound were carried out analogously to Example 249A. Starting with 750 mg (3.15 mmol) of ent-benzyl (2-amino-3-methoxypropyl)carbamate (enantiomer B) from Example 248A, 454 mg (81% of theory) of the target compound were obtained.
1H NMR (400 MHz, DMSO-d6): δ=3.03-3.11 (m, 2H), 3.32 (s, 3H), 3.55-3.64 (m, 3H), 8.31-8.69 (m, 4H).
Example 251A
Ethyl 2,6-dimethyl-8-(3-methylbutoxy)imidazo[1,2-a]pyridine-3-carboxylate




1.23 ml (9.4 mmol) of 1-iodo-3-methylbutane and 6.12 g (18.8 mmol) of caesium carbonate were added to 2.0 g (8.5 mmol) of ethyl 8-hydroxy-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylate Example 239A in 122.3 ml of DMF, and the mixture was stirred at 60° C. for 40 min. 900 ml of water were added to the reaction mixture, which had cooled to RT, and the mixture was stirred at RT for 1 h, and the precipitated solid was filtered off, washed with water and dried under high vacuum. This gave 2.25 g (84% of theory; purity 97%) of the title compound.
LC-MS (Method 7): Rt=1.12 min
MS (ESpos): m/z=305 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.96 (d, 6H), 1.35 (t, 3H), 1.70 (q, 2H), 1.77-1.89 (m, 1H), 2.33 (s, 3H), 2.56 (s, 3H), 4.17 (t, 2H), 4.34 (q, 2H), 6.88 (s, 1H), 8.64 (s, 1H).
Example 252A
2,6-Dimethyl-8-(3-methylbutoxy)imidazo[1,2-a]pyridine-3-carboxylic acid 




2.25 g (7.4 mmol) of ethyl 2,6-dimethyl-8-(3-methylbutoxy)imidazo[1,2-a]pyridine-3-carboxylate Example 251A were initially charged in 157 ml of THF/methanol 5:1, 37 ml (37 mmol) of 1 N lithium hydroxide solution were added and the reaction mixture stirred at RT over the weekend. The mixture was then cooled to 0° C., acidified to pH 4 with 6 N hydrochloric acid and freed from the organic solvent under reduced pressure. The precipitated solid was filtered off, washed with water and dried under high vacuum. This gave 1.64 g (80% of theory; purity 100%) of the title compound.
LC-MS (Method 2): Rt=0.71 min
MS (ESpos): m/z=277 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.96 (d, 6H), 1.70 (q, 2H), 1.78-1.89 (m, 1H), 2.32 (s, 3H), 2.56 (s, 3H), 4.17 (t, 2H), 6.85 (s, 1H), 8.69 (s, 1H), 12.86-13.08 (m, 1H).
Example 253A
rac-tert-Butyl 2-{[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)-amino]methyl}-3,4-dihydroquinoline-1(2H)-carboxylate 




145 mg (0.45 mmol) of TBTU and 0.2 ml (1.89 mmol) of 4-methylmorpholine were added to 120 mg (0.38 mmol) of 8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid Example 3A in 2.4 ml of DMF, and the mixture was stirred at RT for 10 min. 124 mg (0.42 mmol) of rac-tert-butyl 2-(aminomethyl)-3,4-dihydroquinoline-1(2H)-carboxylate hydrochloride were added and the reaction mixture was stirred at RT overnight. Water was added, and the reaction mixture was stirred at RT for 30 min. The precipitated solid was filtered off, washed with water and dried under high vacuum. This gave 190 mg (90% of theory; purity 100%) of the title compound.
LC-MS (Method 7): Rt=1.13 min
MS (ESpos): m/z=563 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.38 (s, 9H), 1.64-1.75 (m, 1H), 2.11-2.21 (m, 1H), 2.25 (s, 3H), 2.65-2.76 (m, 2H), 3.10-3.20 (m, 1H), 3.57-3.66 (m, 1H), 4.68 (quintet, 1H), 5.29 (s, 2H), 6.91 (t, 1H), 6.96-7.03 (m, 2H), 7.08 (t, 1H), 7.13 (d, 1H), 7.19-7.27 (m, 2H), 7.37 (d, 1H), 7.54-7.63 (m, 1H), 7.83 (t, 1H), 8.58 (d, 1H).
Example 254A
ent-tert-Butyl {(1R,2R)-2-[({8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]cyclohexyl}carbamate 




Preparation and purification of the title compound were carried out analogously to Example 253A. Starting with 80 mg (0.24 mmol) of 8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxylic acid Example 21A and 57 mg (0.27 mmol) of ent-(1R,2R)-trans-N-Boc-1,2-cyclohexanediamine, 107 mg (83% of theory; purity 98%) of the target compound were obtained.
LC-MS (Method 7): Rt=1.02 min
MS (ESpos): m/z=529 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.16-1.45 (m, 13H), 1.61-1.74 (m, 2H), 1.76-1.86 (m, 1H), 1.89-1.99 (m, 1H), 2.30 (s, 3H), 2.46 (s, 3H), 3.37-3.46 (m, 1H), 3.67-3.78 (m, 1H), 5.28 (s, 2H), 6.81 (d, 1H), 6.91 (s, 1H), 7.20-7.28 (m, 2H), 7.54-7.64 (m, 2H), 8.46 (s, 1H).
Example 255A
rac-Ethyl 8-[1-(2,6-difluorophenyl)ethoxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylate




5.50 g (23.5 mmol) of ethyl 8-hydroxy-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylate Example 239A, 4.46 g (28.2 mmol) of 1-(2,6-difluorophenyl)ethanol, 5.35 ml (27.0 mmol) of diisopropyl azodicarboxylate and 7.08 g (27.0 mmol) of triphenylphosphine were dissolved in 141 ml of THF and stirred at RT for 2 h. 0.70 ml (3.5 mmol) of diisopropyl azodicarboxylate and 0.62 g (2.3 mmol) of triphenylphosphine were added to the reaction mixture, and the reaction solution was stirred at RT for 1 h. The precipitated solid was filtered off and dried under high vacuum. This gave 4.6 g (52.8% of theory; purity 100%) of the title compound. The filtrate was concentrated and purified twice by silica gel chromatography (cyclohexane:ethyl acetate gradient=from 8:1 to 4:1). All product-containing fractions were re-purified by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). This gave another 2.16 g (25% of theory) of the target compound.
LC-MS (Method 2): Rt=1.08 min
MS (ESpos): m/z=375 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.34 (t, 3H), 1.79 (d, 3H), 2.25 (s, 3H), 2.58 (s, 3H), 4.33 (q, 2H), 6.17 (q, 1H), 6.73 (s, 1H), 7.06-7.16 (m, 2H), 7.37-7.48 (m, 1H), 8.67 (s, 1H).
Example 256A
ent-Ethyl 8-[1-(2,6-difluorophenyl)ethoxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylate (enantiomer B)




6.8 g of Example 255A were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×30 mm, mobile phase: 70% isohexane, 30% ethanol, flow rate: 50 ml/min; 40° C., detection: 210 nm].
Enantiomer B:
Yield: 2.7 g (98.4% ee)
Rt=5.18 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm; mobile phase: 70% isohexane, 30% ethanol; flow rate 1.0 ml/min; 30° C.; detection: 220 nm].
Example 257A
ent-8-[1-(2,6-Difluorophenyl)ethoxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylic acid (enantiomer B)




2.58 g (6.9 mmol) of ent-ethyl 8-[1-(2,6-difluorophenyl)ethoxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxylate Example 256A (enantiomer B) were dissolved in 154 ml of THF/methanol 5:1, 34.5 ml (34.5 mmol) of 1 N aqueous lithium hydroxide solution were added and the mixture was stirred at 40° C. for 5 h. The reaction mixture, cooled to RT, was acidified with 6 N hydrochloric acid solution and concentrated. The solid was filtered off, washed with water and dried under high vacuum. This gave 2.26 g (95% of theory; purity 100%) of the title compound.
LC-MS (Method 2): Rt=0.74 min
MS (ESpos): m/z=347 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.79 (d, 3H), 2.24 (s, 3H), 2.57 (s, 3H), 6.16 (q, 1H), 6.67 (s, 1H), 7.06-7.16 (m, 2H), 7.38-7.48 (m, 1H), 8.74 (s, 1H), 12.24-13.90 (br. s, 1H).
Example 258A
Ethyl 2,6-dimethyl-8-[4,4,4-trifluoro-3-(trifluoromethyl)butoxy]imidazo[1,2-a]pyridine-3-carboxylate 




7.89 g (24.2 mmol) of caesium carbonate and 2.30 g (8.88 mmol) of 4,4,-trifluoro-3-(trifluoromethyl)butyl bromide were added to 1.89 g (8.07 mmol) of ethyl 8-hydroxy-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylate Example 239A in 60 ml of DMF, and the reaction mixture was stirred at RT for 90 min. 60 ml of water were then added, the precipitated solid was filtered off and the filter residue was washed with 100 ml of water and twice with 20 ml of tert-butyl methyl ether. The precipitate which had precipitated from the filtrate was filtered off and washed with filtrate. Both filter residues were taken up in 50 ml of ethyl acetate. The solution was concentrated under reduced pressure and the residue was dried under reduced pressure overnight. This gave 2.25 g of the target compound (95% pure, 64% of theory).
LC-MS (Method 2): Rt=1.16 min
MS (ESpos): m/z=413 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.36 (t, 3H), 2.34 (s, 3H), 2.32-2.38 (m, 2H), 2.58 (s, 3H), 4.18-4.30 (m, 1H), 4.31-4.38 (m, 4H), 6.93 (s, 1H), 8.71 (s, 1H).
Example 259A
2,6-Dimethyl-8-[4,4,4-trifluoro-3-(trifluoromethyl)butoxy]imidazo[1,2-a]pyridine-3-carboxylic acid 




3.28 g (10.4 mmol) of barium hydroxide octahydrate were added to 1.95 g (4.73 mmol) of ethyl 2,6-dimethyl-8-[4,4,4-trifluoro-3-(trifluoromethyl)butoxy]imidazo[1,2-a]pyridine-3-carboxylate Example 258A in 30 ml of methanol, and the mixture was stirred at RT for 3 days. The suspension was diluted with 30 ml of water and adjusted to pH 6 with 1 M hydrochloric acid. The solid was filtered off, washed with 50 ml of water and dried under reduced pressure at 70° C. for 2 h. This gave 1.64 g of the target compound (90% pure, 81% of theory).
LC-MS (Method 2): Rt=0.78 min
MS (ESpos): m/z=385 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=2.29 (s, 3H), 2.28-2.37 (m, 2H), 2.56 (s, 3H), 4.22-4.35 (m, 3H), 6.74 (s, 1H), 8.99 (s, 1H).
Example 260A
rac-2-Amino-4-(benzyloxy)-2-methylbutanonitrile




6.37 g (119.1 mmol) of ammonium chloride (dissolved in 15 ml of warm water) and 9 ml (216.6 mmol) of conc. ammonia in water were added to 5.31 g (108.3 mmol) of sodium cyanide in 10 ml of water. 19.3 g (108.3 mmol) of 4-(benzyloxy)butan-2-one, dissolved in 3 ml of ethanol, were then added. The mixture was stirred at RT for 15 min and at 60° C. for 2 h. Another 4 g (81.6 mmol) of sodium cyanide, 4.8 g (89.7 mmol) of ammonium chloride and 6.5 ml (156.4 mmol) of conc. ammonia in water were added and the mixture was stirred at 60° C. for a further 2 h. The reaction solution was then cooled, and 300 ml each of methylenechloride and water were added. After phase separation, the aqueous phase was extracted with 300 ml of methylene chloride. The combined organic phases were dried and concentrated. The crude product was purified on silica gel (cyclohexane/ethyl acetate gradient 6/4-1/1). This gave 19.9 g of the target compound (77% pure, 69% of theory).
LC-MS (Method 11): Rt=2.31 min
MS (ESpos): m/z=205 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.37 (s, 3H), 1.81-1.94 (m, 2H), 2.57 (br. s, 2H), 3.58-3.69 (m, 2H), 4.48 (s, 2H), 7.25-7.38 (m, 5H).
Example 261A
rac-4-(Benzyloxy)-2-methylbutane-1,2-diamine




Under argon and at 0° C., 1.59 ml (1.59 mmol) of lithium aluminium hydride (1 N solution in diethyl ether) were added to 0.5 g (2.45 mmol) of 2-amino-4-(benzyloxy)-2-methylbutanonitrile Example 260A in 25 ml of dry THF. The reaction solution was stirred first at 0° C. for 30 min and then for another 1 h whilst slowly warming to room temperature. 245 μl of water, 245 μl of 2 N aqueous sodium hydroxide solution and 490 μl of water were then added carefully. The precipitate was filtered off and washed with THF and methanol, the filtrate was concentrated and the residue was purified by silica gel chromatography (mobile phase: dichloromethane/2 N ammonia in methanol=20/1, isocratic). This gave 0.30 g of the target compound (96% pure, 57% of theory).
LC-MS (Method 11): Rt=1.94 min
MS (ESpos): m/z=209 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.90 (s, 3H), 1.56 (t, 2H), 2.27-2.38 (m, 2H), 3.45-3.60 (m, 2H), 4.42 (s, 2H), 7.22-7.36 (m, 5H).
Example 262A
rac-2-Amino-3-(benzyloxy)-2-methylpropionitrile 




5.07 g (27.79 mmol) of 1-(benzyloxy)acetone were initially charged in 55.6 ml of 2 N aqueous ammonia in methanol, 1.53 g (31.12 mmol) of sodium cyanide and 3.71 g (31.12 mmol) of ammonium chloride were added and the mixture was heated under reflux for 2 h. Another 27.4 ml of 2 N aqueous ammonia in methanol were then added, and the reaction mixture was stirred under reflux for 2 h. The reaction solution was cooled and diluted with 90 ml of dichloromethane. The solid obtained was filtered off and the filtrate was concentrated. The residue was purified using silica gel (mobile phase: cyclohexane/ethyl acetate gradient: from 4/1 to 1/1). This gave 4.94 g of the target compound (90% pure, 84% of theory).
LC-MS (Method 2): Rt=0.60 min
MS (ESpos): m/z=191 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.34 (s, 3H), 3.29-3.44 (m, 2H), 4.59 (s, 2H), 7.26-7.39 (m, 5H).
Example 263A
rac-3-(Benzyloxy)-2-methylpropane-1,2-diamine




Under argon and at −78° C., 20.9 ml (20.9 mmol) of lithium aluminium hydride (1 N solution in diethyl ether) were added to 6.8 g (32.17 mmol, purity about 90%) of 2-amino-3-(benzyloxy)-2-methylpropionitrile Example 262A in 329 ml of dry THF. The reaction solution was at −78° C. for 1 h, at −20° C. for 2 h and at 0° C. for 2 h. 3.22 ml of water, 3.22 ml of 2 N aqueous sodium hydroxide solution and 6.44 ml of water were then added carefully. The precipitate was filtered off and washed with THF and methanol, and the filtrate was concentrated. This gave 8 g of the crude product. 7 g of this crude product were purified by silica gel chromatography (mobile phase: dichloromethane/2 N ammonia in methanol=from 20/1 to 10/1). This gave 1.52 g of the target compound (about 28% of theory).
LC-MS (Method 11): Rt=2.05 min
MS (ESpos): m/z=195 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.88 (s, 3H), 1.39 (br. s, 2H), 2.30-2.47 (m, 2H), 3.12-3.22 (m, 2H), 4.44 (s, 2H), 7.24-7.38 (m, 5H).
Example 264A
Ethyl 2,6-dimethyl-8-[(2,3,6-trifluorobenzyl)oxy]imidazo[1,2-a]pyridine-3-carboxylate




3.00 g (12.81 mmol) of ethyl 8-hydroxy-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylate Example 239A, 3.27 g (14.1 mmol) of 2-(bromomethyl)-1,3,4-trifluorobenzene and 9.18 g (28.17 mmol) of caesium carbonate were initially charged in 183 ml of dry DMF and heated for 30 min in an oil bath warmed to 60° C. About 1.8 l of water were then added, and the mixture was stirred for 30 min. The solid was filtered off, washed with water and dried under reduced pressure. This gave 5.07 g of the title compound (99% of theory; purity about 96%).
LC-MS (Method 2): Rt=1.14 min
MS (ESpos): m/z=379 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.35 (t, 3H); 2.36 (s, 3H); 2.55 (s, 3H; superimposed by DMSO signal); 4.36 (q, 2H); 5.35 (s, 2H); 7.09 (s, 1H); 7.22-7.32 (m, 1H); 7.60-7.73 (m, 1H); 8.72 (s, 1H).
Example 265A
2,6-Dimethyl-8-[(2,3,6-trifluorobenzyl)oxy]imidazo[1,2-a]pyridine-3-carboxylic acid 




5.07 g (12.87 mmol) of ethyl 2,6-dimethyl-8-[(2,3,6-trifluorobenzyl)oxy]imidazo[1,2-a]pyridine-3-carboxylate Example 265A were dissolved in 275 ml of THF/methanol (5/1), 64.4 ml of 1 N aqueous lithium hydroxide solution were added and the mixture was stirred at 40° C. for 3.5 h. At 0° C., the mixture was acidified to about pH 4 with 6 N aqueous hydrochloric acid and concentrated. The solid formed was filtered off, washed with water and dried under reduced pressure. This gave 4.77 g (98% of theory; purity about 93%) of the title compound.
LC-MS (Method 2): Rt=0.72 min
MS (ESpos): m/z=351 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=2.37 (s, 3H); 2.54 (s, 3H; superimposed by DMSO signal); 5.36 (s, 2H); 7.11 (s, 1H); 7.25-7.33 (m, 1H); 7.61-7.73 (m, 1H); 8.78 (s, 1H); 13.10 (br. s, 1H).
Example 266A
4-Fluoro-2-nitropyridin-3-ol




With ice cooling, 500 mg (3.43 mmol) of 4-fluoropyridin-3-ol hydrochloride were dissolved carefully in 3.2 ml of concentrated sulphuric acid, and, at 0° C., 0.21 ml of concentrated nitric acid was added carefully. The reaction was warmed to RT and stirred at RT overnight. The mixture was then added to 10 g of ice, and 6 ml of 45% strength aqueous sodium hydroxide solution were added dropwise with ice cooling. The resulting precipitate was filtered off and then dried under reduced pressure overnight. This gave 191 mg (36% of theory) of the title compound.
LC-MS (Method 2): Rt=0.36 min
MS (ESneg): m/z=157 (M−H)−
1H NMR (400 MHz, DMSO-d6): δ=7.69 (dd, 1H); 7.95-8.01 (m, 1H); 11.97 (br. s, 1H).
Example 267A
2-Amino-4-fluoropyridin-3-ol




Under argon, 90 mg (0.57 mmol) of 4-fluoro-2-nitropyridin-3-ol Example 266A were dissolved in 30 ml of ethanol, a spatula tip of 10% palladium on activated carbon was added and the mixture was hydrogenated under atmospheric pressure at RT for 1.5 h. The mixture was then filtered off through silica gel and the filter cake was washed with a lot of ethanol. The solution was concentrated and dried. This gave 56 mg (77% of theory) of the title compound.
LC-MS (Method 2): Rt=0.16 min
MS (ESpos): m/z=129 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=5.78 (br. s, 2H); 6.42 (dd, 1H); 7.37-7.43 (m, 1H); 9.47 (br. s, 1H).
Example 268A
3-[(2,6-Difluorobenzyl)oxy]-4-fluoropyridine-2-amine




55 mg (0.43 mmol) of 2-amino-4-fluoropyridin-3-ol Example 267A, 98 mg (0.47 mmol) of 2-(bromomethyl)-1,3-difluorobenzene and 308 mg (0.95 mmol) of caesium carbonate were initially charged in 1 ml of dry DMF and heated for 15 min in an oil bath warmed to 50° C. The mixture was then filtered off and purified by preparative HPLC (Method 9). This gave 70 mg of the title compound (64% of theory).
LC-MS (Method 2): Rt=0.70 min
MS (ESpos): m/z=255 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=5.06 (s, 2H); 6.04 (br. s, 2H); 6.42 (dd, 1H); 7.08-7.16 (m, 2H); 7.45-7.54 (m, 1H); 7.62-7.69 (m, 1H).
Example 269A
Ethyl 8-[(2,6-difluorobenzyl)oxy]-7-fluoro-2-methylimidazo[1,2-a]pyridine-3-carboxylate




Under argon, 500 mg (1.97 mmol) of 3-[(2,6-difluorobenzyl)oxy]-4-fluoropyridine-2-amine Example 268A were initially charged in 10 ml of ethanol, 500 mg of powdered molecular sieve 4A and 3.24 g (19.67 mmol) of ethyl 2-chloroacetoacetate were added and the mixture was then heated at reflux for 48 h. All volatile components were evaporated at 85° C. under reduced pressure. The crude product was purified by silica gel chromatography (mobile phase: cyclohexane/ethyl acetate=9/1 isocratic). This gave 368 mg (39% of theory; purity about 76%) of the title compound.
LC-MS (Method 2): Rt=1.19 min
MS (ESpos): m/z=365 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.37 (t, 3H); 2.62 (s, 3H); 4.38 (q, 2H); 5.60 (s, 2H); 7.09-7.22 (m, 3H); 7.47-7.56 (m, 1H); 8.98 (dd, 1H).
Example 270A
8-[(2,6-Difluorobenzyl)oxy]-7-fluoro-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid




1.14 ml (1.14 mmol) of 1 N lithium hydroxide solution were added to 365 mg (0.76 mmol; purity about 76%) of ethyl 8-[(2,6-difluorobenzyl)oxy]-7-fluoro-2-methylimidazo[1,2-a]pyridine-3-carboxylate Example 269A in 16.6 ml of THF/ethanol (5/1), and the mixture was stirred at RT overnight. Another 2.67 ml (2.67 mmol) of 1 N lithium hydroxide solution were added and the mixture was stirred at RT overnight. Under reduced pressure, the reaction mixture was freed from organic solvent, and the aqueous phase was acidified to pH 4 with 6 N hydrochloric acid whilst cooling with ice water. The solid formed was filtered off and dried under high vacuum. This gave 236 mg of the target compound (87% of theory, purity 94%).
LC-MS (Method 2): Rt=0.83 min
MS (ESpos): m/z=337 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=2.62 (s, 3H); 5.60 (s, 2H); 7.09-7.18 (m, 3H); 7.47-7.55 (m, 1H); 9.04 (dd, 1H); 13.22 (br. s, 1H).
Example 271A
rac-Benzyl (2-cyanobutan-2-yl)carbamate 




5.00 g (50.94 mmol) of 2-amino-2-methylbutanonitrile [synthesis described in: Lonza AG, U.S. Pat. No. 5,698,704 (1997); Deng, S. L. et al. Synthesis 2001, 2445; Hjorringgaard, C. U. et al. J. Org. Chem. 2009, 74, 1329; Ogrel, A. et al. Eur. J. Org. Chem. 2000, 857] were initially charged in 50 ml of THF and 6.5 ml of water, 21.83 g (157.92 mmol) of potassium carbonate were added and 7.9 ml (56.04 mmol) of benzyl chlorocarbonate (benzyl chloroformate) were added at 0° C. After addition of 8 ml of THF and 3 ml of water, the reaction mixture was stirred overnight whilst slowly warming to RT. Water was then added, and the mixture was extracted three times with ethyl acetate. The combined organic phases were dried over sodium sulphate and concentrated. The residue was dissolved in diethyl ether and precipitated with petroleum ether. The product was filtered off and the solid was washed with a little petroleum ether and dried under high vacuum. This gave 11.35 g of the target compound (93% of theory, purity 97%).
LC-MS (Method 2): Rt=0.97 min
MS (ESpos): m/z=233 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.95 (t, 3H), 1.51 (s, 3H), 1.75-1.95 (m, 2H), 5.07 (s, 2H), 7.30-7.43 (m, 4H), 7.88-8.03 (m, 1H).
Example 272A
ent-Benzyl (2-cyanobutan-2-yl)carbamate (enantiomer A)




8 g of rac-benzyl (2-cyanobutan-2-yl)carbamate Example 271A were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralcel OJ-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% isopropanol, flow rate: 20 ml/min; 40° C., detection: 220 nm].
Enantiomer A: Yield: 3.23 g (>99% ee)
Rt=6.69 min [Daicel Chiralcel OJ-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% isopropanol; flow rate 1.0 ml/min; 30° C.; detection: 220 nm].
Example 273A
ent-Benzyl (2-cyanobutan-2-yl)carbamate (enantiomer B)




8 g of rac-benzyl (2-cyanobutan-2-yl)carbamate Example compound 271A were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralcel OJ-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% isopropanol, flow rate: 20 ml/min; 40° C., detection: 220 nm].
Enantiomer B: Yield: 3.18 g (>99% ee)
Rt=8.29 min [Daicel Chiralcel OJ-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% isopropanol; flow rate 1.0 ml/min; 30° C.; detection: 220 nm].
Example 274A
ent-Benzyl (1-amino-2-methylbutan-2-yl)carbamate (enantiomer A)




4.00 g (17.22 mmol) of ent-benzyl (2-cyanobutan-2-yl)carbamate Example 272A were dissolved in 50 ml of a 7 N solution of ammonia in methanol, 5.33 g of Raney nickel were added and hydrogenated at about 25 bar at RT for 24 h. The mixture was filtered off through Celite, the filter cake was washed with methanol and the filtrate was concentrated. The crude product was purified by silica gel chromatography (mobile phase: dichloromethane/2N ammonia in methanol=10/0.5). This gave 2.20 g of the target compound (54% of theory).
LC-MS (Method 2): Rt=0.56 min
MS (ESpos): m/z=237 (M+H)+
Example 275A
ent-Benzyl (1-amino-2-methylbutan-2-yl)carbamate (enantiomer B)




4.00 g (17.22 mmol) of ent-benzyl (2-cyanobutan-2-yl)carbamate Example 273A were dissolved in 50 ml of a 7 N solution of ammonia in methanol, 5.33 g of Raney nickel were added and the mixture was hydrogenated at about 25 bar at RT for 24 h. The reaction mixture was filtered off through Celtite, the filter cake was washed thoroughly with methanol and the filtrate was concentrated. The crude product was purified by silica gel chromatography (mobile phase: dichloromethane/2N ammonia in methanol=10/0.5).
This gave 3.56 g of the target compound (87% of theory).
LC-MS (Method 13): Rt=1.40 min
MS (ESpos): m/z=237 (M+H)+
Example 276A
ent-Benzyl {1-[({8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridin-3-yl}carbonyl)-amino]-2-methylbutan-2-yl}carbamate (enantiomer A) 




2.34 g (6.75 mmol; purity about 96%) of 8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxylic acid Example 21A, 2.82 g (7.43 mmol) of O-(7-azabenzotriazol-1-yl)-N,N,N′N′-tetramethyluronium hexafluorophosphate (HATU) and 2.62 g (20.25 mmol) of N,N-diisopropylethylamine were initially charged in 43 ml of DMF and stirred at RT for 20 min. 1.80 g (7.43 mmol) of ent-benzyl (1-amino-2-methylbutan-2-yl)carbamate (enantiomer A) Example 274A were then added, and the mixture was stirred at RT overnight. About 200 ml of water were added, and the reaction solution was stirred at RT for 45 min. The solid formed was filtered off, dissolved in ethyl acetate and washed twice with water. The organic phase was dried over sodium sulphate, filtered and concentrated. The residue was dissolved in ethyl acetate and washed with 0.1 N aqueous hydrochloric acid and water. The organic phase was dried over sodium sulphate, filtered and concentrated. This gave 3.55 g of the target compound (96% of theory).
LC-MS (Method 2): Rt=1.08 min
MS (ESpos): m/z=551 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.82 (t, 3H), 1.19 (s, 3H), 1.52-1.63 (m, 1H), 1.75-1.87 (m, 1H), 2.31 (s, 3H), 3.46-3.58 (m, 2H), 5.00 (s, 2H), 5.30 (s, 2H), 6.98 (br. s, 1H), 7.05 (s, 1H), 7.19-7.39 (m, 7H), 7.54-7.64 (m, 1H), 7.75 (br. s, 1H), 8.48 (s, 1H), [further signal hidden under DMSO signal].
Example 277A 
ent-Benzyl {1-[({8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridin-3-yl}carbonyl)-amino]-2-methylbutan-2-yl}carbamate (enantiomer B)




1.40 g (4.03 mmol; purity about 96%) of 8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxylic acid Example 21A, 1.69 g (4.43 mmol) of O-(7-azabenzotriazol-1-yl)-N,N,N′N′-tetramethyluronium hexafluorophosphate (HATU) and 1.56 g (12.09 mmol) of N,N-diisopropylethylamine were initially charged in 26 ml of DMF and stirred at RT for 20 min. 1.00 g (4.23 mmol) of ent-benzyl (1-amino-2-methylbutan-2-yl)carbamate (enantiomer B) Example 275A was then added, and the mixture was stirred at RT overnight. Another 48 mg (0.20 mmol) of ent-benzyl (1-amino-2-methylbutan-2-yl)carbamate (enantiomer B) were added, and the mixture was stirred at RT for 30 min. About 200 ml of water were added, and the reaction solution was stirred at room temperature for 45 min. The solid formed was filtered off and washed twice with water. This gave 2.06 g of the target compound (89% of theory; purity about 96%). The filter used was rinsed with acetonitrile and the solvent was concentrated. This gave another 0.12 g of the target compound (5% of theory; purity about 96%).
LC-MS (Method 2): Rt=1.08 min
MS (ESpos): m/z=551 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.82 (t, 3H), 1.19 (s, 3H), 1.51-1.63 (m, 1H), 1.75-1.87 (m, 1H), 2.31 (s, 3H), 3.46-3.58 (m, 2H), 5.00 (s, 2H), 5.29 (s, 2H), 6.92 (s, 1H), 7.05 (s, 1H), 7.19-7.39 (m, 7H), 7.54-7.64 (m, 1H), 7.69 (t, 1H), 8.48 (s, 1H), [further signal hidden under DMSO signal].
Example 278A 
ent-Benzyl {1-[({2,6-dimethyl-8-[(2,3,6-trifluorobenzyl)oxy]imidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]-2-methylbutan-2-yl}carbamate trifluoroacetate (enantiomer A)




282 mg (0.81 mmol) of 2,6-dimethyl-8-[(2,3,6-trifluorobenzyl)oxy]imidazo[1,2-a]pyridine-3-carboxylic acid Example 265A, 337 mg (0.89 mmol) of O-(7-azabenzotriazol-1-yl)-N,N,N′N′-tetramethyluronium hexafluorophosphate (HATU) and 313 mg (2.42 mmol) of N,N-diisopropylethylamine were initially charged in 5.1 ml of DMF and stirred at RT for 20 min. 219 mg (0.93 mmol) of ent-benzyl (1-amino-2-methylbutan-2-yl)carbamate (enantiomer A) Example 274A were then added, and the mixture was stirred at RT overnight. A little water/acetonitrile was added to the reaction solution, and the product was purified by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). This gave 389 mg of the target compound (71% of theory).
LC-MS (Method 2): Rt=1.14 min
MS (ESpos): m/z=569 (M−TFA+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.82 (t, 3H), 1.19 (s, 3H), 1.49-1.62 (m, 1H), 1.76-1.89 (m, 1H), 2.38 (s, 3H), 3.48-3.60 (m, 2H; superimposed by solvent signal), 4.95-5.05 (m, 2H), 5.43 (s, 2H), 7.08 (s, 1H), 7.22-7.43 (m, 7H), 7.64-7.74 (m, 1H), 8.18 (br. s, 1H), 8.53 (s, 1H), [further signal hidden under DMSO signal].
Example 279A
ent-Benzyl {1-[({2,6-dimethyl-8-[(2,3,6-trifluorobenzyl)oxy]imidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]-2-methylbutan-2-yl}carbamate trifluoroacetate (enantiomer B) 




282 mg (0.81 mmol) of 2,6-dimethyl-8-[(2,3,6-trifluorobenzyl)oxy]imidazo[1,2-a]pyridine-3-carboxylic acid Example 265A, 337 mg (0.89 mmol) of O-(7-azabenzotriazol-1-yl)-N,N,N′N′-tetramethyluronium hexafluorophosphate (HATU) and 313 mg (2.42 mmol) of N,N-diisopropylethylamine were initially charged in 5.1 ml of DMF and stirred at RT for 20 min. 200 mg (0.85 mmol) of ent-benzyl (1-amino-2-methylbutan-2-yl)carbamate (enantiomer B) Example 275A were then added, and the mixture was stirred at RT overnight. A little water/acetonitrile was added to the reaction solution, and the product was purified by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). This gave 206 mg of the target compound (36% of theory; purity 97%).
LC-MS (Method 2): Rt=1.13 min
MS (ESpos): m/z=569 (M−TFA+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.82 (t, 3H), 1.19 (s, 3H), 1.49-1.62 (m, 1H), 1.76-1.89 (m, 1H), 2.39 (s, 3H), 3.49-3.61 (m, 2H; superimposed by solvent signal), 4.95-5.05 (m, 2H), 5.44 (s, 2H), 7.08 (s, 1H), 7.23-7.46 (m, 7H), 7.64-7.74 (m, 1H), 8.20 (br. s, 1H), 8.53 (s, 1H), [further signal hidden under DMSO signal].
Working Examples
Example 1
N-(9-Cyclopropyl-9-azabicyclo[3.3.1]non-3-yl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide




70 mg of 8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid (0.22 mmol), 209 mg of O-(7-azabenzotriazol-1-yl)-N,N,N′N′-tetramethyluronium hexafluorophosphate (HATU, 0.55 mmol) and 85 mg of N,N-diisopropylethylamine (0.66 mmol) were initially charged in 1.5 ml of DMF and stirred for 15 min. 59 mg of 9-cyclopropyl-9-azabicyclo[3.3.1]nonane-3-amine (0.33 mmol) were added, and the mixture was stirred at RT overnight. The mixture was then stirred overnight once more, at 60° C. 12 ml of water were added to the reaction solution, and the precipitate formed was filtered off, washed with water and dried. The residue formed was purified by silica gel chromatography (mobile phase: dichloromethane/methanol 40:1). This gave 60 mg of the title compound (53% of theory, purity 94%).
LC-MS (Method 2): Rt=0.63 min
MS (ESpos): m/z=481 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.24 (br s, 2H), 0.45 (d, 2H), 1.04 (d, 2H), 1.48-1.56 (m, 3H), 1.86-1.1.97 (m, 2H), 2.00-2.12 (m, 1H), 2.15-2.28 (m, 2H), 2.30-2.38 (m, 1H), 2.49 (s, 3H), 3.19 (d, 2H), 4.09-4.23 (m, 1H), 5.30 (s, 2H), 6.90 (t, 1H), 6.99 (d, 1H), 7.23 (t, 2H), 7.54-7.68 (m, 2H), 8.50 (d, 1H).
Example 2
rac-N-(1-Amino-4,4,4-trifluorobutan-2-yl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide




555 mg of rac-N-(1-azido-4,4,4-trifluorobutan-2-yl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (Example 41A, 1.19 mmol) were initially charged in 74 ml of ethanol, 126 mg of palladium on activated carbon (10%) were added and the mixture was hydrogenated at hydrogen standard pressure and RT for 60 min. The reaction solution was filtered and concentrated. The crude product was purified by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). The product-containing fractions were taken up in ethyl acetate and washed with saturated aqueous sodium bicarbonate solution. The organic phase was dried over sodium sulphate, filtered and concentrated. This gave 473 mg of the title compound (88% of theory).
LC-MS (Method 2): Rt=0.65 min
MS (ESpos): m/z=443 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.92 (br s, 2H), 2.48-2.60 (m, 3+1H), 2.62-2.80 (m, 3H), 4.18-4.30 (m, 1H), 5.30 (s, 2H), 6.93 (t, 1H), 7.00 (d, 1H), 7.22 (t, 2H), 7.59 (quint, 1H), 7.79 (br s, 1H), 8.53 (d, 1H).
Example 3
ent-N-(1-Amino-4,4,4-trifluorobutan-2-yl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer B) 




Example 2 was separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm; mobile phase: 25% isohexane, 75% ethanol+0.2% diethylamine; flow rate 15 ml/min; 45° C.; detection: 220 nm]
Enantiomer B:
Yield: 154 mg (99% pure, >99% ee)
Rt=16.57 min [Chiralpak AD-H, 5 μm, 250×4.6 mm; mobile phase: 25% isohexane, 75% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 40° C.; detection: 220 nm].
The examples shown in Table 1 were prepared analogously to Example 2.









TABLE 1






IUPAC name/structure



Example
(yield)
Analytical data







4
rac-N-(1-amino-6,6,6-trifluorohexan-2-yl)-8- [(2,6-difluorobenzyl)oxy]-2- methylimidazo[1,2-a]pyridine-3- carboxamide   



LC-MS (Method 2): Rt = 1.03 min MS (ESpos): m/z = 497 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.49-1.72 (m, 4H), 2.18-2.41 (m, 2H), 2.50 (s, 3H), 2.69 (d, 2H), 3.87-3.98 (m, 1H), 5.30 (s, 2H), 6.92 (t, 1H), 7.00 (d, 1H), 7.22 (d, 2H), 7.56-7.68 (m, 2H), 8.52 (d, 1H).


 



(90% of theory)



5
rac-N-[1-amino-5,5,5-trifluoro-4- (trifluoromethyl)pentan-2-yl]-8-[(2,6- difluorobenzyl)oxy]-2-methylimidazo[1,2-a]- pyridine-3-carboxamide trifluoroacetate a)   



LC-MS (Method 7): Rt = 0.70 min MS (ESpos): m/z = 525 (M − TFA+H)+ 1H NMR (400 MHz DMSO-d6): δ = 2.12-2.28 (m, 2H), 2.60 (s, 3H), 2.99- 3.10 (m, 2H), 3.14-3.25 (m, 1H), 3.95- 4.10 (m, 1H), 4.37-4.49 (m, 1H), 5.35 (s, 2H), 7.05-7.12 (m, 1H), 7.15-7.28 (m, 3H), 7.60 (q, 1H), 7.69-7.82 (m, 1H), 7.97 (br s, 3H), 8.70 (d, 1H).


 



(91% of theory)





a) There was no aqueous work-up after preparative HPLC.






Example 6
ent-N-(1-Amino-6,6,6-trifluorohexan-2-yl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer B)




The compound of Example 4 (388 mg) was separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm; mobile phase: 25% isohexane, 75% ethanol+0.2% diethylamine; flow rate 15 ml/min; 45° C.; detection: 220 nm]
Enantiomer B:
Yield: 136 mg (99% pure, >99% ee)
Rt=17.00 min [Chiralpak AD-H, 5 μm, 250×4.6 mm; mobile phase: 25% isohexane, 75% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 40° C.; detection: 220 nm].
Example 7
ent-N-[1-Amino-5,5,5-trifluoro-4-(trifluoromethyl)pentan-2-yl]-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer A) 




The compound of Example 5 (140 mg) was separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak OD-H, 5 μm, 250×20 mm; mobile phase: 70% isohexane, 30% ethanol+0.2% diethylamine; flow rate 20 ml/min; 25° C.; detection: 230 nm]
Enantiomer A:
Yield: 31 mg (>99% ee)
Rt=4.47 min [Daicel Chiralpak OD-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; detection: 250 nm].
Example 8
N-[(2R)-1-Aminohexan-2-yl]-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide 




42 mg of N-[(2R)-1-azidohexan-2-yl]-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide (Example 44A, 0.095 mmol) were initially charged in 0.78 ml of THF/water (10:1.5), 28.3 mg of triphenylphosphine (0.108 mmol) were added and the mixture was stirred at RT overnight. The reaction mixture was concentrated and the residue was purified by preparative thick-layer chromatography (mobile phase ethyl acetate:dichloromethane:diethylamine=2:1:0.1). The combined product fractions were purified by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). The product-containing fractions were taken up in ethyl acetate and washed with saturated aqueous sodium bicarbonate solution. The organic phase was dried over sodium sulphate, filtered and concentrated. This gave 17 mg of the title compound (41% of theory).
LC-MS (Method 1): Rt=0.88 min
MS (ESpos): m/z=417 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.88 (t, 3H), 1.21-1.39 (m, 4H), 1.42-1.67 (m, 2H), 2.73 (d, 2H), 3.92-4.08 (m, 1H), 5.30 (s, 2H), 6.93 (t, 1H), 7.00 (d, 1H), 7.22 (t, 2H), 7.56-7.7.62 (m, 2H), 8.56 (d, 1H).
Example 9
rac-N-[2-Amino-1-(4-fluorophenyl)ethyl]-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide 




7 ml of 2M hydrochloric acid in diethyl ether (14 mmol) were added to 363 mg of tert-butyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]-2-(4-fluorophenyl)ethyl}carbamate (Example 79A, 0.63 mmol), and the mixture was stirred at RT for 3 h. The resulting precipitate was filtered off, washed with diethyl ether, dissolved in dichloromethane and methanol and washed with saturated aqueous sodium bicarbonate solution. The organic phase was dried over sodium sulphate and filtered and the filtrate was concentrated and dried under high vacuum. This gave 275 mg of the title compound (96% of theory).
LC-MS (Method 2): Rt=0.68 min
MS (ESpos): m/z=455 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.62 (br s, 2H), 2.60 (s, 3H), 2.85-2.96 (m, 2H), 4.98 (t, 1H), 5.31 (s, 2H), 6.90 (t, 1H), 6.99 (d, 1H), 7.18 (t, 2H), 7.22 (t, 2H), 7.41 (dd, 2H), 7.59 (quint, 1H), 8.20 (br s, 1H), 8.53 (d, 1H).
Example 10
ent-N-[2-Amino-1-(4-fluorophenyl)ethyl]-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer B) 




The compound of Example 9 (242 mg) was separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 100% ethanol+0.2% diethylamine, flow rate 15 ml/min; 45° C., detection: 220 nm].
Enantiomer B:
Yield: 110 mg (99% pure, about 99% ee)
Rt=10.25 min [Chiralpak AD-H, 5 μm, 250×4.6 mm; mobile phase: 70% isohexane, 30% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 45° C.; detection: 235 nm].
Example 11
rac-N-[2-Amino-1-(3,4-difluorophenyl)ethyl]-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide 




3.1 ml of 2 M hydrochloric acid in diethyl ether (6.2 mmol) were added to 355 mg of rac-tert-butyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]-2-(3,4-difluorophenyl)ethyl}carbamate (Example 77A, 0.62 mmol), and the mixture was stirred at RT for 5.5 h. The resulting precipitate was filtered off, washed with diethyl ether, suspended in dichloromethane and washed with saturated aqueous sodium bicarbonate solution. The organic phase was dried over sodium sulphate and filtered and the filtrate was concentrated and dried under high vacuum. This gave 279 mg of the title compound (94% of theory).
LC-MS (Method 2): Rt=0.77 min
MS (ESpos): m/z=473 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=2.18 (br s, 2H), 2.60 (s, 3H), 2.87-2.97 (m, 2H), 4.99 (t, 1H), 5.31 (s, 2H), 6.91 (t, 1H), 7.01 (d, 1H), 7.19-7.28 (m, 3H), 7.36-7.51 (m, 2H), 7.59 (quint, 1H), 8.21 (br s, 1H), 8.54 (d, 1H).
Example 12
Enantiomer A
ent-N-[2-Amino-1-(3,4-difluorophenyl)ethyl]-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer A) 




The compound of Example 11 (250 mg) was separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak AY-H, 5 μm, 250×20 mm, mobile phase: 70% isohexane, 30% ethanol+0.2% diethylamine, flow rate 15 ml/min; 45° C., detection: 220 nm]. The product fractions were concentrated, taken up in water/acetonitrile and freeze-dried. The product was then purified by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). The combined fractions were lyophilized and the residue was dissolved in ethyl acetate and washed with a little saturated aqueous sodium bicarbonate solution. The organic phase was dried over sodium sulphate and filtered. The filtrate was concentrated and dried under high vacuum.
Enantiomer A:
Yield: 88 mg (99% pure, about 94% ee)
Rt=7.55 min [Chiralpak AY-H, 5 μm, 250×4.6 mm; mobile phase: 70% isohexane, 30% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 45° C.; detection: 235 nm].
LC-MS (Method 2): Rt=0.78 min
MS (ESpos): m/z=473 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=2.59 (s, 3H), 2.88-3.01 (m, 2H), 5.02 (t, 1H), 5.31 (s, 2H), 6.91 (t, 1H), 7.01 (d, 1H), 7.19-7.29 (m, 3H), 7.36-7.52 (m, 2H), 7.59 (quint, 1H), 8.21 (br s, 1H), 8.54 (d, 1H).
Specific rotation [α](436 nm, 20.4° C.)=+23.8° (c=0.0053 g/ml, acetonitrile)
Example 13
Enantiomer B
ent-N-[2-Amino-1-(3,4-difluorophenyl)ethyl]-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer B)




19 ml of 2 M hydrochloric acid in diethyl ether (38 mmol) were added to 2.18 g of ent-tert-butyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]-2-(3,4-difluorophenyl)ethyl}carbamate (Example 118A, 3.80 mmol), and the mixture was stirred at RT overnight. The reaction mixture was diluted with diethyl ether. The precipitate was filtered off, and ethyl acetate and saturated aqueous sodium bicarbonate solution were added. After phase separation, the aqueous phase was extracted twice with ethyl acetate. The combined organic phases were dried over sodium sulphate and filtered and the filtrate was concentrated and lyophilized. This gave 1.85 g of the title compound (quantitative).
LC-MS (Method 2): Rt=0.80 min
MS (ESpos): m/z=473 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.55 (br s, 2H), 2.59 (s, 3H), 2.85-2.95 (m, 2H), 4.97 (t, 1H), 5.31 (s, 2H), 6.91 (t, 1H), 7.01 (d, 1H), 7.19-7.28 (m, 3H), 7.36-7.51 (m, 2H), 7.59 (quint, 1H), 8.21 (br s, 1H), 8.54 (d, 1H).
Specific rotation [α](436 nm, 19.9° C.)=−23.5° (c=0.00505 g/ml, acetonitrile)
Example 14
rac-N-[2-Amino-1-(4-chlorophenyl)ethyl]-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide dihydrochloride




3.5 ml (7.0 mmol) of a 2 M solution of hydrochloric acid in diethyl ether were added to 396 mg of rac-tert-butyl {2-(4-chlorophenyl)-2-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridin-3-yl}carbonyl)amino]ethyl}carbamate (Example 78A, 0.69 mmol), and the mixture was stirred at RT for 5.5 h. The resulting precipitate was filtered off, washed with diethyl ether and dried under high vacuum. This gave 341 mg of the title compound (90% of theory).
LC-MS (Method 2): Rt=0.72 min
MS (ESpos): m/z=471 (M−2HCl+H)+
1H NMR (400 MHz, DMSO-d6): δ=2.69 (s, 3H), 3.16-3.28 (m, 1H), 3.38-3.53 (m, 1H), 5.40-5.49 (m, 3H), 7.23 (t, 2H), 7.34 (br s, 1H), 7.41-7.67 (m, 6H), 8.20-8.43 (m, 3H), 8.65 (d, 1H), 9.39 (br s, 1H).
Example 15
ent-N-[2-Amino-1-(4-chlorophenyl)ethyl]-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer B)




288 mg compound of Example 14 were suspended in ethyl acetate and washed with saturated aqueous sodium bicarbonate solution. The organic phase was dried over sodium sulphate and filtered. The filtrate was concentrated and dried under high vacuum. The crude product (279 mg) was separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 30% isohexane, 70% ethanol+0.2% diethylamine, flow rate 15 ml/min; 45° C., detection: 220 nm]. The product was re-purified by silica gel (mobile phase: from dichloromethane to dichloromethane:methanol=10:1). This was followed by a further purification by preparative HPLC (RP18 column, mobile phase: methanol/water gradient with addition of 0.1% TFA). The product fractions were dissolved in ethyl acetate and twice washed with a little saturated aqueous sodium bicarbonate solution. The organic phase was dried over sodium sulphate and filtered and the filtrate was concentrated and dried under high vacuum overnight.
Enantiomer B:
Yield: 62 mg (99% pure, 99% ee)
Rt=8.77 min [Chiralpak AY-H, 5 μm, 250×4.6 mm; mobile phase: 60% isohexane, 40% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 35° C.; detection: 235 nm].
1H NMR (400 MHz, DMSO-d6): δ=2.04 (br s, 2H), 2.60 (s, 3H), 2.85-2.95 (m, 2H), 4.98 (t, 1H), 5.30 (s, 2H), 6.90 (t, 1H), 7.02 (d, 1H), 7.22 (t, 2H), 7.38-7.44 (m, 4H), 7.59 (quint, 1H), 8.20 (br s, 1H), 8.53 (d, 1H).
Example 16
rac-N-(2-Amino-1-phenylethyl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide dihydrochloride




15.75 ml of a 2 M solution of hydrochloric acid in diethyl ether (31.5 mmol) were added to 370 mg of rac-tert-butyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]-2-phenylethyl}carbamate (Example 80A, 0.69 mmol), and the mixture was stirred at RT for 3.5 h. The resulting precipitate was filtered off, washed with diethyl ether and dried under high vacuum. This gave 306 mg of the title compound (85% of theory, purity 98%).
LC-MS (Method 2): Rt=0.70 min
MS (ESpos): m/z=437 (M−2HCl+H)+
1H NMR (400 MHz, DMSO-d6): δ=2.65 (s, 3H), 3.19-3.29 (m, 1H), 3.35-3.54 (m, 1H), 5.38-5.49 (m, 3H), 7.21-7.54 (m, 10H), 7.60 (quint, 1H), 8.12-8.32 (m, 2H), 8.66 (d, 1H), 9.09 (br s, 1H).
The example shown in Table 2 was prepared analogously to Example 16.









TABLE 2






IUPAC name/structure



Example
(yield)
Analytical data







17
rac-N-(1-aminopropan-2-yl)-8-[(2,6- difluorobenzyl)oxy]-2-methylimidazo[1,2-a]- pyridine-3-carboxamide dihydrochloride   



LC MS (Method 1): Rt = 0.69 min MS (ESpos): m/z = 375 (M − HCl + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.28 (d, 3H), 2.64 (s, 3H), 2.96- 3.10 (m, 2H), 4.32 (quintet, 1H), 5.44 (s, 2H), 7.22 (t, 2H), 7.33 (br s, 1H), 7.46-7.66 (m, 2H), 8.18 (br s, 3H), 8.58 (br s, 1H), 8.73 (d, 1H).


 



(92% of theory)









Example 18
ent-N-(2-Amino-1-phenylethyl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer B)




276 mg of compound of Example 16 were suspended in ethyl acetate/dichloromethane (1:1) and washed with saturated aqueous sodium bicarbonate solution. The organic phase was dried over sodium sulphate, filtered and concentrated. The crude product (247 mg) was separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 30% isohexane, 70% ethanol+0.2% diethylamine, flow rate 15 ml/min; 45° C., detection: 220 nm]. The product obtained was re-purified on silica gel (mobile phase: from dichloromethane to dichloromethane:methanol=10:1). This was followed by a further purification by preparative HPLC (RP18 column, mobile phase: methanol/water gradient with addition of 0.1% TFA). The product fractions were concentrated, dissolved in ethyl acetate and twice washed with a little saturated aqueous sodium bicarbonate solution. The organic phase was dried over sodium sulphate, filtered and concentrated.
Enantiomer B:
Yield: 78 mg (98% ee)
Rt=11.00 min [Chiralpak AY-H, 5 μm, 250×4.6 mm; mobile phase: 60% isohexane, 40% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 35° C.; detection: 235 nm].
1H NMR (400 MHz, DMSO-d6): δ=2.59 (s, 3H), 2.98-3.10 (m, 2H), 4.42 (br s, 2H), 5.09-5.18 (m, 1H), 5.30 (s, 2H), 6.90 (t, 1H), 7.01 (d, 1H), 7.19-7.30 (m, 3H), 7.32-7.44 (m, 4H), 7.59 (quint, 1H), 8.21 (d, 1H), 8.55 (d, 1H).
Example 19
ent-N-(1-Aminopropan-2-yl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer A)




46 mg compound of Example 17 were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak AY-H, 5 μm, 250×20 mm, mobile phase: 70% isohexane, 30% ethanol+0.2% diethylamine, flow rate: 15 ml/min; 35° C., detection: 220 nm].
Enantiomer A was re-purified by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). The product fractions were concentrated, dissolved in dichloromethane and twice washed with saturated aqueous sodium bicarbonate solution. The organic phase was dried over sodium sulphate, filtered and concentrated.
Enantiomer A:
Yield: 7.3 mg (99% ee)
Rt=8.59 min [Chiralpak AY-H, 5 μm, 250×4.6 mm; mobile phase: 70% isohexane, 30% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 45° C.; detection: 235 nm].
LC-MS (Method 2): Rt=0.56 min (purity about 92%)
MS (ESpos): m/z=375 (M+H)+
Example 20
ent-N-(1-Aminopropan-2-yl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer B)




46 mg compound of Example 17 were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak AY-H, 5 μm, 250×20 mm, mobile phase: 70% isohexane, 30% ethanol+0.2% diethylamine, flow rate: 15 ml/min; 35° C., detection: 220 nm].
Enantiomer B:
Yield: 13 mg (98.5% ee)
Rt=10.57 min [Chiralpak AY-H, 5 μm, 250×4.6 mm; mobile phase: 70% isohexane, 30% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 45° C.; detection: 235 nm].
LC-MS (Method 2): Rt=0.57 min (purity about 92%)
MS (ESpos): m/z=375 (M+H)+
Example 21
ent-N-[2-Amino-1-(2,4-difluorophenyl)ethyl]-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide




0.63 ml of 2 M hydrochloric acid in diethyl ether (1.26 mmol) was added to 72 mg ent-tert-butyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]-2-(2,4-difluorophenyl)ethyl}carbamate (Example 81A, 0.13 mmol), and the mixture was stirred at RT overnight. The reaction mixture was diluted with diethyl ether and the precipitate was filtered off. Ethyl acetate and saturated aqueous sodium bicarbonate solution were added to the precipitate and the phases were separated. The aqueous phase was extracted twice with ethyl acetate and the combined organic phases were dried over sodium sulphate, filtered, concentrated and lyophilized. This gave 51 mg of the title compound (84% of theory).
LC-MS (Method 2): Rt=0.78 min
MS (ESpos): m/z=473 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.69 (br s, 2H), 2.59 (s, 3H), 2.82-2.92 (m, 2H), 5.20 (t, 1H), 5.30 (s, 2H), 6.90 (t, 1H), 7.02 (d, 1H), 7.05-7.11 (m, 1H), 7.18-7.28 (m, 3H), 7.50 (q, 1H), 7.59 (quint, 1H), 8.22 (br s, 1H), 8.53 (d, 1H).
The examples shown in Table 3 were prepared analogously to Example 21.









TABLE 3






IUPAC name/structure



Example
(yield)
Analytical data







22
ent-N-(1-aminopropan-2-yl)-6-chloro-8-[(2,6- difluorobenzyl)oxy]-2-methylimidazo[1,2-a]- pyridine-3-carboxamide 1)   



LC-MS (Method 2): Rt = 0.68 min MS (ESpos): m/z = 409 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.24 (d, 3H), 1.63 (br s, 2H), 2.52 (s, 3H), 2.59-2.71 (m, 2H), 3.89-4.00 (m, 1H), 5.33 (s, 2H), 7.19 (s, 1H), 7.23 (t, 2H), 7.60 (quintet, 1H), 7.68 (br s, 1H), 8.70 (s, 1H).


 



(88% of theory)



23
rac-N-(2-aminopropyl)-6-chloro-8-[(2,6- difluorobenzyl)oxy]-2-methylimidazo[1,2-a]- pyridine-3-carboxamide 2)   



LC-MS (Method 2): Rt = 0.71 min MS (ESpos): m/z = 409 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.01 (d, 3H), 1.70 (br s, 2H), 2.52 (s, 3H), 2.99 (sextet, 1H), 3.09-3.27 (m, 2H), 5.33 (s, 2H), 7.19 (s, 1H), 7.24 (t, 2H), 7.61 (quintet, 1H), 7.78 (br s, 1H), 8.76 (s, 1H).


 



(78% of theory, purity about 90%)



24
N-(1-amino-2-methylpropan-2-yl)-6-chloro-8- [(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2- a]pyridine-3-carboxamide 2)   



LC-MS (Method 2): Rt = 0.73 min MS (ESpos): m/z = 423 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.33 (s, 6H), 1.89 (br s, 2H), 2.52 (s, 3H), 2.71 (s, 2H), 5.33 (s, 2H), 7.19 (s, 1H), 7.24 (t, 2H), 7.40 (s, 1H), 7.61 (quintet, 1H), 8.80 (s, 1H).


 



(86% of theory)



25
rac-N-(2-aminopropyl)-8-[(2,6-difluorobenzyl)- oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3- carboxamide 3)   



LC-MS (Method 2): Rt = 0.55 min MS (ESpos): m/z = 389 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.01 (d, 3H), 1.52 (br s, 2H), 2.31 (s, 3H), 2.52 (s, 3H), 2.99 (sextet, 1H), 3.09-3.28 (m, 2H), 5.29 (s, 2H), 6.91 (s, 1H), 7.24 (t, 2H), 7.59 (quintet, 1H), 7.78 (br s, 1H), 8.45 (s, 1H).


 



(73% of theory, purity about 90%)



26
N-(1-amino-2-methylpropan-2-yl)-8-[(2,6- difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]- pyridine-3-carboxamide 3)   



LC-MS (Method 2): Rt = 0.64 min MS (ESpos): m/z = 403 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.32 (s, 6H), 1.70 (br s, 2H), 2.31 (s, 3H), 2.52 (s, 3H), 2.69 (s, 2H), 5.28 (s, 2H), 6.90 (s, 1H), 7.24 (t, 2H), 7.30 (s, 1H), 7.60 (quintet, 1H), 8.52 (s, 1H).


 



(82% of theory)



27
N-(9-azabicyclo[3.3.1]non-3-yl)-8-[(2,6- difluorobenzyl)oxy]-2-methylimidazo[1,2-a]- pyridine-3-carboxamide 4)   



LC-MS (Method 2): Rt = 0.62 min MS (ESpos): m/z = 441 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.63-1.90 (m, 8H), 1.94-2.03 (m, 2H), 2.48 (s, 3H), 3.28 (br s, 2H), 4.69-4.81 (m, 1H), 5.30 (s, 2H), 6.91 (t, 1H), 6.99 (d, 1H), 7.24 (t, 2H), 7.59 (quintet, 1H), 7.78 (d, 1H), 8.51 (d, 1H). 


 



(81% of theory)



28
rac-8-[(2,6-difluorobenzyl)oxy]-N-(2,3-dihydro- 1H-indol-3-yl)-2-methylimidazo[1,2-a]pyridine- 3-carboxamide   



LC-MS (Method 2): Rt = 0.78 min MS (ESpos): m/z = 435 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 2.50 (s, 3H), 3.31-3.40 (m, 1H), 3.73-3.80 (m, 1H), 5.30 (s, 2H), 5.58- 5.69 (m, 2H), 6.57-6.63 (m, 2H), 6.93 (t, 1H), 6.98-7.05 (m, 2H), 7.18-7.27 (m, 3H), 7.59 (quintet, 1H), 8.40 (d, 1H), 8.60 (d, 1H).


 



(99% of theory)





1) prepared from Example 119A, (enantiomer B)


2) The starting materials were dissolved in diethyl ether to form a 0.5M solution.


3) The starting materials were dissolved in 1,4-dioxane to form a 0.2-0.5M solution.


4) The reaction time was 2.5 h.






Example 29
ent-N-(2-Aminopropyl)-6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer A)




68 mg of Example 23 were separated into the enantiomers by two preparative separations on a chiral phase:
1) Column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 60% isohexane, 40% ethanol+0.2% diethylamine, flow rate: 15 ml/min; 30° C., detection: 220 nm.
2) Column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 60% isohexane, 40% isopropanol+0.2% diethylamine, flow rate: 15 ml/min; 30° C., detection: 220 nm.
Enantiomer A:
Yield: 21 mg (99% ee)
Rt=10.15 min [Chiralpak AY-H, 5 μm, 250×4.6 mm; mobile phase: 80% isohexane, 20% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 40° C.; detection: 220 nm].
Example 30
ent-N-(2-Aminopropyl)-6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer B) 




68 mg of Example 23 were separated into the enantiomers by two preparative separations on a chiral phase:
1) Column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 60% isohexane, 40% ethanol+0.2% diethylamine, flow rate: 15 ml/min; 30° C., detection: 220 nm.
2) Column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 60% isohexane, 40% isopropanol+0.2% diethylamine, flow rate: 15 ml/min; 30° C., detection: 220 nm.
Enantiomer B:
Yield: 21 mg (95% ee)
Rt=9.31 min [Chiralpak AY-H, 5 μm, 250×4.6 mm; mobile phase: 80% isohexane, 20% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 40° C.; detection: 220 nm].
Example 31
ent-N-(2-Aminopropyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer A) 




47 mg of Example 25 were separated into the enantiomers by two preparative separations on a chiral phase:
1) Column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine, flow rate: 15 ml/min; 40° C., detection: 220 nm.
2) Column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% isopropanol+0.2% diethylamine, flow rate: 15 ml/min; 40° C., detection: 220 nm.
Enantiomer A: Yield: 13 mg (99% ee)
Rt=7.00 min [Chiralpak AY-H, 5 μm, 250×4.6 mm; mobile phase: 70% isohexane, 30% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 40° C.; detection: 220 nm].
Example 32
ent-N-(2-Aminopropyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer B) 




47 mg of Example 25 were separated into the enantiomers by two preparative separations on a chiral phase:
1) Column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine, flow rate: 15 ml/min; 40° C., detection: 220 nm.
2) Column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% isopropanol+0.2% diethylamine, flow rate: 15 ml/min; 40° C., detection: 220 nm.
Enantiomer B:
Yield: 14 mg (97% ee)
Rt=6.27 min [Chiralpak AY-H, 5 μm, 250×4.6 mm; mobile phase: 70% isohexane, 30% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 40° C.; detection: 220 nm].
Example 33
N-[2-(1-Aminocyclohexyl)ethyl]-6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide 




99 mg of rac-tert-butyl (1-{2-[({6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridin-3-yl}carbonyl)amino]ethyl}cyclohexyl)carbamate trifluoroacetate (Example 93A, 0.14 mmol) were suspended in 0.67 ml of diethyl ether, 0.72 ml of a 2 M solution of hydrochloric acid in diethyl ether (1.43 mmol) were added and the mixture was stirred at RT overnight. The precipitate was filtered off and washed with diethyl ether, and ethyl acetate and saturated aqueous sodium bicarbonate solution were added. After phase separation, the aqueous phase was extracted twice with ethyl acetate and the combined organic phases dried over sodium sulphate. The mixture was then filtered and the filtrate was concentrated and lyophilized. This gave 61 mg of the title compound (89% of theory).
LC-MS (Method 2): Rt=0.80 min
MS (ESpos): m/z=477 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.22-1.45 (m, 8H), 1.47-1.80 (m, 6H), 2.52 (s, 3H), 3.40 (t, 2H), 5.32 (s, 2H), 7.19 (s, 1H), 7.24 (t, 2H), 7.60 (quint, 1H), 8.55 (br s, 1H), 8.86 (s, 1H).
The examples shown in Table 4 were prepared analogously to Example 33 by reacting 10-20 equivalents) of a 2 N solution of hydrochloric acid in diethyl ether with the corresponding N-Boc compounds under the reaction conditions described. The reaction times were 3 h-5 d.
If appropriate, the purifications were carried out by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% trifluoroacetic acid) and/or by silica gel chromatography (mobile phase gradient: dichloromethane/methanol). If appropriate, the product-containing fractions were concentrated and the residue was dissolved in ethyl acetate or dichloromethane/methanol and washed with a little saturated aqueous sodium bicarbonate solution. The organic phase was then dried over sodium sulphate and filtered and the filtrate was concentrated.
If appropriate, the reaction mixture was filtered off from the precipitate and the precipitate was washed with diethyl ether and dried under high vacuum.
If appropriate, the reaction mixture was diluted with diethyl ether, the precipitate was filtered off and ethyl acetate or dichloromethane and saturated aqueous sodium bicarbonate solution were added to the filtrate. The organic phase was washed with saturated aqueous sodium chloride solution, dried over sodium sulphate and filtered, and the filtrate was concentrated and dried under high vacuum.









TABLE 4






IUPAC name/structure



Example
(yield)
Analytical data







34
rac-N-(2-aminopropyl)-8-[(2,6-difluorobenzyl)- oxy]-2-methylimidazo[1,2-a]pyridine-3- carboxamide dihydrochloride   



LC-MS (Method 7): Rt = 0.48 min MS (ESpos): m/z = 375 (M − 2HCl + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.24 (d, 3H), 2.62 (s, 3H), 3.31- 3.56 (m, 3H), 5.32 (s, 2H), 7.21-7.32 (m, 3H), 7.45 (br s, 1H), 7.61 (quintet, 1H), 8.08 (br s, 3H), 8.54 (br s, 1H), 8.73 (d, 1H).


 



(85% of theory)



35
ent-N-[(2R)-2-aminobutyl]-6-chloro-8-[(2,6- difluorobenzyl)oxy]-2-methylimidazo[1,2-a]- pyridine-3-carboxamide   



LC-MS (Method 2): Rt = 0.72 min MS (ESpos): m/z = 423 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 0.90 (t, 3H), 1.18-1.30 (m, 1H), 1.39-1.75 (m, 3H), 2.49-2.59 (m, 4H), 2.69-2.77 (m, 1H), 3.07-3.16 (m, 1H), 5.33 (s, 2H), 7.19 (s, 1H), 7.24 (t, 2H), 7.60 (quintet, 1H), 7.83 (br s, 1H), 8.77 (s, 1H).


 



(96% of theory)



36
N-(2-aminoethyl)-6-chloro-8-[(2,6- difluorobenzyl)oxy]-2-methylimidazo[1,2-a]- pyridine-3-carboxamide   



LC-MS (Method 2): Rt = 0.68 min MS (ESpos): m/z = 395 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 2.50 (s, 3H), 2.73 (t, 2H), 3.32 (m, covered by the water signal, 2H), 5.33 (s, 2H), 7.19 (s, 1H), 7.24 (t, 2H), 7.60 (quintet, 1H), 7.90 (br s, 1H), 8.77 (s, 1H).


 



(98% of theory)



37
N-(3-aminopropyl)-6-chloro-8-[(2,6-difluoro- benzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3- carboxamide   



LC-MS (Method 2): Rt = 0.68 min MS (ESpos): m/z = 409 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.62 (quintet, 2H), 2.52 (s, 3H), 2.63 (t, 2H), 3.32 (m, covered by the water signal, 2H), 5.32 (s, 2H), 7.19 (s, 1H), 7.24 (t, 2H), 7.61 (quintet, 1H), 8.10 (br s, 1H), 8.77 (s, 1H).


 



(70% of theory)



38
N-[(1-aminocyclopropyl)methyl]-8-[(2,6- difluorobenzyl)oxy]-2-methylimidazo[1,2-a]- pyridine-3-carboxamide    



LC-MS (Method 7): Rt = 0.49 min MS (ESpos): m/z = 387 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 0.42 (t, 2H), 0.54 (t, 2H), 1.94 (br s, 2H), 2.50 (s, 3H), 3.34 (d, 2H), 5.30 (s, 2H), 6.92 (t, 1H), 7.00 (d, 1H), 7.24 (t, 2H), 7.59 (quintet, 1H), 7.88 (t, 1H), 8.58 (d, 1H).


 



(69% of theory)



39
N-[(1-aminocyclopropyl)methyl]-6-chloro-8- [(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2- a]pyridine-3-carboxamide   



LC-MS (Method 2): Rt = 0.76 min MS (ESpos): m/z = 421 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 0.44 (t, 2H), 0.55 (t, 2H), 1.98 (br s, 2H), 2.50 (s, 3H), 3.34 (d, 2H), 5.36 (s, 2H), 7.19 (s, 1H), 7.24 (t, 2H), 7.59 (quintet, 1H), 7.93 (t, 1H), 8.70 (s, 1H).


 



(90% of theory)



40
N-[(1-aminocyclopropyl)methyl]-8-[(2,6- difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]- pyridine-3-carboxamide   



LC-MS (Method 2): Rt = 0.60 min MS (ESpos): m/z = 401 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 0.44 (t, 2H), 0.54 (t, 2H), 1.98 (br s, 2H), 2.30 (s, 3H), 2.50 (s, 3H), 3.32 (d, covered by the water signal, 2H), 5.29 (s, 2H), 6.89 (s, 1H), 7.24 (t, 2H), 7.59 (quintet, 1H), 7.83 (t, 1H), 8.41 (s, 1H).


 



(76% of theory)



41
N-[(1-aminocyclopentyl)methyl]-8-[(2,6- difluorobenzyl)oxy]-2-methylimidazo[1,2-a]- pyridine-3-carboxamide   



LC-MS (Method 7): Rt = 0.54 min MS (ESpos): m/z = 415 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.32-1.44 (m, 2H), 1.50-1.61 (m, 4H), 1.65-2.10 (m, 4H), 2.50 (s, 3H), 3.32 (d, covered by the water signal, 2H), 5.30 (s, 2H), 6.92 (t, 1H), 7.01 (d, 1H), 7.23 (t, 2H), 7.59 (quintet, 1H), 7.70-7.80 (m, 1H), 8.62 (d, 1H).


 



(77% of theory)



42
N-[(1-aminocyclopentyl)methyl]-6-chloro-8- [(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2- a]pyridine-3-carboxamide   



LC-MS (Method 7): Rt = 0.73 min MS (ESpos): m/z = 449 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.32-1.45 (m, 2H), 1.50-1.80 (m, 8H), 2.50 (s, 3H), 3.32 (d, covered by the water signal, 2H), 5.33 (s, 2H), 7.19 (s, 1H), 7.24 (t, 2H), 7.60 (quintet, 1H), 7.69 (br s, 1H), 8.75 (s, 1H).


 



(93% of theory)









Example 43
rac-N-[2-Amino-1-(4-chlorophenyl)ethyl]-8-(cyclohexylmethoxy)-2-methylimidazo[1,2-a]-pyridine-3-carb oxamide 




2 ml of 2 M hydrochloric acid in diethyl ether (4.0 mmol) were added to 107 mg of Example 83A (0.16 mmol), and the mixture was stirred at RT overnight. The precipitate was filtered off, washed with diethyl ether, dissolved in dichloromethane containing a little methanol, washed twice with saturated aqueous sodium bicarbonate solution and finally with water. The organic phase was dried over sodium sulphate, filtered, concentrated and lyophilized. This gave 61 mg of the title compound (85% of theory).
LC-MS (Method 2): Rt=0.80 min
MS (ESpos): m/z=441 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.02-1.14 (m, 2H), 1.16-1.38 (m, 3H), 1.48-1.89 (m, 8H), 2.62 (s, 3H), 2.84-2.92 (m, 2H), 3.93 (d, 2H), 4.91-4.99 (m, 1H), 6.78 (d, 1H), 6.82 (t, 1H), 7.38-7.44 (m, 4H), 8.19 (br s, 1H), 8.46 (d, 1H).
Example 44
rac-N-(2-Amino-1-phenylethyl)-8-(cyclohexylmethoxy)-2-methylimidazo[1,2-a]pyridine-3-carboxamide 




2 ml of 2 M hydrochloric acid in diethyl ether (4.0 mmol) were added to 70 mg of Example 82A (0.1 mmol), and the mixture was stirred at RT overnight. The precipitate was filtered off, washed with diethyl ether, dissolved in a mixture of dichloromethane and a little methanol, washed twice with saturated aqueous sodium bicarbonate solution and finally with water. The organic phase was dried over sodium sulphate, filtered, concentrated and lyophilized. The product fractions were purified by thick-layer chromatography (mobile phase: toluene/methanol=10/1). This gave 31 mg of the title compound (73% of theory).
LC-MS (Method 7): Rt=0.68 min
MS (ESpos): m/z=407 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.03-1.14 (m, 2H), 1.16-1.37 (m, 3H), 1.63-2.20 (m, 8H), 2.63 (s, 3H), 2.85-2.94 (m, 2H), 3.94 (d, 2H), 4.93-5.03 (m, 1H), 6.78 (d, 1H), 6.84 (t, 1H), 7.20-7.27 (m, 1H), 7.30-7.44 (m, 4H), 8.19 (br s, 1H), 8.48 (d, 1H).
Example 45
ent-N-[2-Amino-1-(2,4-difluorophenyl)ethyl]-8-(cyclohexylmethoxy)-2-methylimidazo[1,2-a]-pyridine-3-carboxamide 




0.27 ml of 2M hydrochloric acid in diethyl ether (0.53 mmol) were added to 35 mg of Example 85A (0.05 mmol), and the mixture was stirred at RT overnight. The precipitate was filtered off, washed with diethyl ether, dissolved in ethyl acetate and washed twice with saturated aqueous sodium bicarbonate solution. The organic phase was dried over sodium sulphate, filtered and the filtrate was concentrated and lyophilized. This gave 23 mg of the title compound (93% of theory).
LC-MS (Method 7): Rt=0.73 min
MS (ESpos): m/z=443 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.02-1.13 (m, 2H), 1.14-1.36 (m, 3H), 1.63-1.99 (m, 8H), 2.62 (s, 3H), 2.83-2.94 (m, 2H), 3.95 (d, 2H), 5.18-5.23 (m, 1H), 6.78 (d, 1H), 6.83 (t, 1H), 7.07-7.12 (m, 1H), 7.18-7.26 (m, 1H), 7.50 (q, 1H), 8.12-8.28 (m, 1H), 8.47 (d, 1H).
Example 46
rac-N-[2-Amino-1-(3,4-difluorophenyl)ethyl]-8-(cyclohexylmethoxy)-2-methylimidazo[1,2-a]-pyridine-3-carboxamide 




1.5 ml of 2 M hydrochloric acid in diethyl ether (3.0 mmol) were added to 198 mg of Example 84A (0.30 mmol), and the mixture was stirred at RT overnight. The precipitate was filtered off, washed thoroughly with diethyl ether, dissolved in ethyl acetate and washed twice with saturated aqueous sodium bicarbonate solution. The organic phase was dried over sodium sulphate and filtered and the filtrate was concentrated and lyophilized. This gave 119 mg of the title compound (89% of theory).
LC-MS (Method 1): Rt=1.04 min
MS (ESpos): m/z=443 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.02-1.13 (m, 2H), 1.14-1.34 (m, 3H), 1.50-1.90 (m, 8H), 2.62 (s, 3H), 2.85-2.94 (m, 2H), 3.95 (d, 2H), 4.92-4.99 (m, 1H), 6.79 (d, 1H), 6.83 (t, 1H), 7.20-7.28 (m, 1H), 7.36-7.49 (m, 2H), 8.16 (br s, 1H), 8.48 (d, 1H).
Example 47
ent-8-[(2,6-Difluorobenzyl)oxy]-N-(2,3-dihydro-1H-indol-3-yl)-2-methylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer B) 




299 mg of Example 28 XX (mmol) were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak IA, 5 μm, 250×20 mm, mobile phase: 40% acetonitrile, 60% methanol, flow rate: 20 ml/min; 25° C., detection: 230 nm]. The product fractions were dissolved in acetonitrile/water and lyophilized.
Enantiomer B:
Yield: 91 mg (99% ee)
Rt=4.87 min [Chiralpak IA, 5 μm, 250×4.6 mm; mobile phase: 50% acetonitrile, 50% methanol; flow rate 1.0 ml/min; 30° C.; detection: 220 nm].
Example 48
ent-N-(1-Aminopropan-2-yl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxamide 




48 mg of ent-tert-butyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]propyl}carbamate (Example 121A-enantiomer A, 0.1 mmol) were dissolved in 2.4 ml of diethyl ether, 0.49 ml of 2 M hydrochloric acid in diethyl ether (0.98 mmol) was added and the mixture was stirred at RT overnight. Another 0.25 ml of 2 M hydrochloric acid in diethyl ether was added, and the reaction solution was stirred at RT overnight. The mixture was then concentrated and the residue was dissolved in dichloromethane and washed with saturated aqueous sodium bicarbonate solution. The organic phase was concentrated. This gave 36 mg of the title compound (92% of theory).
LC-MS (Method 1): Rt=0.71 min
MS (ESpos): m/z=389 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.28 (d, 3H), 2.38 (s, 3H), 2.59 (s, 3H), 2.94-3.07 (m, 2H), 4.30 (quintet, 1H), 5.37 (s, 2H), 7.05-7.40 (m, 3H), 7.61 (quintet, 1H), 8.09 (br s, 3H), 8.51 (s, 1H).
Example 49
rac-6-Chloro-8-[(2,6-difluorobenzyl)oxy]-N-(2,3-dihydro-1H-indol-3-yl)-2-methylimidazo[1,2-a]-pyridine-3-carboxamide 




141 mg of rac-tert-butyl 3-[({6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]indolin-1-carboxylate (Example 104A, 0.25 mmol) were dissolved in 1.2 ml of diethyl ether, 1.24 ml of a 2 M solution of hydrochloric acid in diethyl ether (2.48 mmol) were added and the mixture was stirred at RT overnight. 1.24 ml of a 2 M solution of hydrochloric acid in diethyl ether (2.48 mmol) were then added, and the mixture was stirred at RT for 3 d. 1.24 ml of a 2 M solution of hydrochloric acid in diethyl ether (2.48 mmol) were then added a little at a time and the mixture was stirred under reflux for 4 h (with additional diethyl ether and hydrochloric acid in diethyl ether being added a little at a time!). The precipitate was filtered off and washed thoroughly with diethyl ether, and ethyl acetate and saturated aqueous sodium bicarbonate solution were then added. After phase separation, the aqueous phase was extracted twice with ethyl acetate. The combined organic phases were dried over sodium sulphate and filtered, and the filtrate was concentrated and lyophilized. This gave 93 mg of the title compound (80% of theory).
LC-MS (Method 2): Rt=1.02 min
MS (ESpos): m/z=469 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=2.49 (s, 3H), 3.31-3.40 (m, 1H), 3.73-3.81 (m, 1H), 5.33 (s, 2H), 5.61 (q, 1H), 5.68 (s, 1H), 6.56-6.63 (m, 2H), 7.02 (t, 1H), 7.18-7.28 (m, 4H), 7.60 (quintet, 1H), 8.50 (d, 1H), 8.71 (s, 1H).
Example 50
rac-8-[(2,6-Difluorobenzyl)oxy]-2-methyl-N-(1,2,3,4-tetrahydroquinolin-4-yl)imidazo[1,2-a]-pyridine-3-carboxamide 




229 mg of rac-tert-butyl 4-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]-3,4-dihydroquinoline-1(2H)-carboxylate (Example 105A, 0.41 mmol) were dissolved in 10 ml of diethyl ether, 2.05 ml of a 2 M solution of hydrochloric acid (4.09 mmol) were added and the mixture was stirred at RT overnight. Another 1.02 ml of a 2 M solution of hydrochloric acid in diethyl ether were then added, and the mixture was stirred at RT overnight. A little diethyl ether was added to the reaction mixture and the solid obtained was filtered off and washed with diethyl ether. The solid was dissolved in dichloromethane containing a little methanol and washed with saturated aqueous sodium bicarbonate solution. The organic phase was concentrated. The crude product was purified by preparative HPLC (RP18 column, mobile phase: methanol/water gradient with addition of 0.1% TFA). The product fractions were concentrated, taken up in dichloromethane and washed with saturated aqueous sodium bicarbonate solution. The organic phase was dried over sodium sulphate, filtered and concentrated. This gave 140 mg of the title compound (75% of theory).
LC-MS (Method 2): Rt=0.83 min
MS (ESpos): m/z=449 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.92-2.05 (m, 2H), 2.50 (s, 3H), 3.20-3.29 (m, 2H), 5.20 (q, 1H), 5.31 (s, 2H), 5.87 (s, 1H), 6.46-6.54 (m, 2H), 6.89-6.94 (m, 2H), 7.00 (d, 1H), 7.10 (d, 1H), 7.23 (t, 2H), 7.59 (quintet, 1H), 8.27 (d, 1H), 8.58 (d, 1H).
Example 51
ent-N-[2-Amino-1-(3,4-difluorophenyl)ethyl]-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo-[1,2-a]pyridine-3-carboxamide 




120 mg of ent-tert-butyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]-2-(3,4-difluorophenyl)ethyl}carbamate (Example 107A, 0.20 mmol) were dissolved in 2 ml of diethyl ether, 1 ml of a 2 M solution of hydrochloric acid in diethyl ether (2 mmol) were added and the mixture was stirred at RT overnight. Another 1 ml of a 2 M solution of hydrochloric acid in diethyl ether was then added, and the mixture was stirred at RT overnight. The reaction mixture was filtered off and washed with diethyl ether. The solid was dissolved in dichloromethane containing a little methanol and washed with saturated aqueous sodium bicarbonate solution. The organic phase was concentrated. The crude product was purified by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). The product fractions were concentrated, taken up in dichloromethane and washed with saturated aqueous sodium bicarbonate solution. The organic phase was dried over sodium sulphate, filtered and concentrated. This gave 82 mg of the title compound (84% of theory).
LC-MS (Method 2): Rt=0.81 min
MS (ESpos): m/z=487 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=2.29 (s, 3H), 2.52 (s, 3H), 2.88-3.00 (m, 2H), 4.93-5.05 (m, 1H), 5.29 (s, 2H), 6.90 (s, 1H), 7.19-7.28 (m, 3H), 7.36-7.49 (m, 2H), 7.59 (quintet, 1H), 8.17 (br s, 1H), 8.38 (s, 1H).
Example 52
ent-8-[(2,6-Difluorobenzyl)oxy]-2-methyl-N-(1,2,3,4-tetrahydroquinolin-4-yl)imidazo[1,2-a]-pyridine-3-carboxamide (enantiomer B) 




132 mg of Example 50 were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak AY-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine, flow rate: 15 ml/min; 45° C., detection: 220 nm].
Enantiomer B:
Yield: 64 mg (99% ee)
Rt=8.05 min [Daicel Chiralpak AY-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 40° C.; detection: 220 nm].
Example 53
ent-N-[2-Amino-1-(3,4-difluorophenyl)ethyl]-8-[(2,6-difluorobenzyl)oxy]-6-fluoro-2-methylimidazo[1,2-a]pyridine-3-carboxamide 




12.5 ml of a 2 M solution of hydrochloric acid in diethyl ether were added to 148 mg of ent-tert-butyl {2-[({8-[(2,6-difluorobenzyl)oxy]-6-fluoro-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)-amino]-2-(3,4-difluorophenyl)ethyl}carbamate (Example 106A; 0.251 mmol), and the mixture was stirred at RT overnight. The reaction precipitate was filtered off, washed with diethyl ether, taken up in ethyl acetate and washed with saturated aqueous sodium bicarbonate solution. The combined organic phases were dried over magnesium sulphate and concentrated. The residue was dissolved in methanol and purified by preparative HPLC (Method 9). This gave 63 mg (51% of theory) of the title compound.
LC-MS (Method 2): Rt=0.87 min
MS (ESpos): m/z=491.1 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.61 (br. s, 2H), 2.58 (s, 3H), 3.38-3.42 (d, 2H), 4.91 (t, 1H); 5.32 (s, 2H); 7.20-7.26 (m, 4H); 7.34-7.46 (m, 2H); 7.59 (quint, 1H), 8.21 (br. s, 1H), 8.61 (d, 1H).
The examples shown in Table 5 were prepared analogously to Example 53.









TABLE 5






IUPAC name / structure



Example
(yield)
Analytical data







54




1H NMR (400 MHz, DMSO-d6): δ = 0.86-1.08 (m, 4H), 2.38-2.46 (m, 1H); 3.12-3.26 (m, 2H); 5.28 (m, 1H); 5.30 (2, 2H), 6.92 (t, 1H); 7.02 (d, 1H); 7.23 (t, 2H); 7.29-7.34 (m, 1H); 7.43-7.62 (m, 3H); 8.53 (br. s, 1H); 8.56 (d, 1H). 


 


55




LC-MS (Method 2): Rt = 0.84 min MS (ESpos): m/z = 459.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 3.29-3.35 (m, 2H), 5.38 (m, 1H), 5.41 (s, 2H), 7.20-7.38 (m, 4H); 7.40-7.48 (m, 2H), 7.55-7.66 (m, 2H), 8.30 (br. s, 2H); 8.90 (br. s, 1H), 9.12 (d, 1H), 9.70 (br. s, 1H).


 


56




LC-MS (Method 2): Rt = 0.59 min MS (ESpos): m/z = 419.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.10 (t, 3H); 2.55 (s, 3H; obscured by DMSO signal), 2.95-3.12 (m, 2H); 3.47-3.58 (m, 4H); 4.41 (m, 1H); 5.32 (s, 2H), 6.95-7.10 (m, 2H); 7.21 (t, 2H); 7.59 (q, 1H); 7.80 (br. s. 1H); 7.91 (br. s., 2H); 8.60 (d, 1H). 


 


57




LC-MS (Method 2): Rt = 0.73 min MS (ESpos): m/z = 453.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.10 (t, 3H); 1.72 (br. s, 2H), 2.55 (s, 3H; superimposed by DMSO signal), 2.71 (d, 2H), 3.48-3.53 (m, 4H); 4.08 (m, 1H), 5.32 (s, 2H), 7.14 (s, 1H); 7.21 (t, 2H), 7.59 (quint, 1H), 7.63 (br. s, 1H); 8.66 (s, 1H).


 


58




LC-MS (Method 2): Rt = 0.72 min MS (ESpos): m/z = 485.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 2.55 (s, 3H; obscured by DMSO signal), 2.85-2.90 (d, 2H), 4.05-4.15 (m, 2H), 4.31 (m, 1H), 5.30 (s, 2H), 6.90 (t, 1H), 6.95-7.00 (m, 3H), 7.10 (t, 2H), 7.21 (t, 2H); 7.59 (q, 1H), 7.80 (br. s. 1H), 8.60 (d, 1H). 


 


59




LC-MS (Method 2): Rt = 0.70 min MS (ESpos): m/z = 467.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 2.60 (s, 3H), 3.10-3.30 (m, 2H), 4.20 (d, 2H), 4.65 (m, 1H), 5.40 (s, 2H), 6.95-7.00 (m, 3H), 7.20 (t, 2H), 7.26 (m, 1H), 7.28 (t, 2H), 7.42 (br. s. 1H), 7.59 (q, 1H), 8.10 (br. s, 3H), 8.58 (br. s, 1H), 8.70 (d, 1H).


 


60




LC-MS (Method 2): Rt = 0.53 min MS (ESpos): m/z = 401.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.63-1.80 (m, 2H); 1.90-2.00 (m, 2H); 2.61 (s, 3H); 2.85-2.98 (m, 2H); 3.20-3.25 (m, 2H); 4.20-4.30 (m, 1H); 5.40 (s, 2H); 7.23 (t, 2H); 7.30 (br. s, 1H); 7.56 (br. s, 1H); 7.60 (quint, 1H), 8.65 (d, 1H); 8.72 (br. s, 1H); 9.02 (br. s, 1H); 9.30 (br. s, 1H).









Example 61
8-[(2,6-Difluorobenzyl)oxy]-2-methyl-N-[(3S)-pyrrolidin-3-yl]imidazo[1,2-a]pyridine-3-carboxamide




130 mg of benzyl (3S)-3-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]pyrrolidine-1-carboxylate (Example 115A; 0.250 mmol) were initially charged in 60 ml of ethanol, 17.5 mg 20% palladium-(II) hydroxide (0.025 mmol, 0.1 equivalents) were added and the mixture was hydrogenated under hydrogen standard pressure for two hours. The reaction mixture was filtered and concentrated and the residue was purified by preparative HPLC. This gave 42 mg (44% of theory) of the title compound.
LC-MS (Method 2): Rt=0.50 min
MS (ESpos): m/z=387.2 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.60-1.70 (m, 1H); 1.95-2.05 (m, 1H); 2.55 (s, 3H; superimposed by DMSO signal); 2.61-2.80 (m, 2H); 2.88-3.03 (m, 2H); 4.28-4.37 (m, 1H); 5.30 (s, 2H); 6.90 (t, 1H); 6.99 (d, 1H); 7.21 (t, 2H); 7.60 (q 1H); 7.81 (d, 1H); 8.51 (d, 1H).
Example 62
ent-N-[2-Amino-2-(3,4-difluorophenyl)ethyl]-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide




160 mg of ent-benzyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]-1-(3,4-difluorophenyl)ethyl}carbamate (intermediate 117A; 0.264 mmol) were initially charged in 150 ml of ethanol, 100 mg of 10% palladium on activated carbon were added and the mixture was hydrogenated under hydrogen standard pressure for two hours. The reaction mixture was filtered and the filtrate was concentrated. This gave 123 mg (99% of theory) of the title compound.
LC-MS (Method 2): Rt=0.67 min
MS (ESpos): m/z=373.3 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=2.33 (s, 3H); 3.40-3.51 (m, 2H); 4.08 (t, 1H); 5.30 (s, 2H); 6.88 (t, 1H); 7.00 (d, 1H); 7.19-7.24 (m, 3H); 7.32 (q, 1H); 7.48 (dd, 1H); 7.56 (q, 1H); 7.80 (t, 1H); 8.51 (d, 1H).
Example 63
rac-N-(1-Amino-3-isopropoxypropan-2-yl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide




305 mg of rac-benzyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]-3-isopropoxypropyl}carbamate (intermediate 116A; 0.54 mmol) were initially charged in 46 ml of ethanol, 44 mg of 10% palladium on activated carbon were added and the mixture was hydrogenated under hydrogen standard pressure for 4 hours. The reaction mixture was filtered and concentrated and the residue was purified by preparative HPLC (column: Macherey-Nagel VP 50/21 Nucleodur 100-5 C18 HTEC, 50×21 mm; mobile phase: gradient with 0.1% strength aqueous ammonia solution and methanol). This gave 127 mg of the title compound (54% of theory).
LC-MS (Method 2): Rt=0.59 min
MS (ESpos): m/z=433.2 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.10 (d, 6H), 1.74 (br. s, 2H), 2.54 (s, 3H; superimposed by DMSO signal), 2.72 (d, 2H), 3.49 (d, 2H), 3.58 (q, 1H), 3.99 (m, 1H), 5.30 (s, 2H), 6.93 (t, 1H), 7.00 (d, 1H), 7.23 (t, 2H), 7.53 (br. s, 1H), 7.59 (q, 1H), 8.60 (d, 1H).
Example 64
ent-8-[(2,6-Difluorobenzyl)oxy]-2-methyl-N-[(2R)-1-(morpholin-4-yl)hexan-2-yl]imidazo[1,2-a]-pyridine-3-carboxamide




59 mg of 8-[(2,6-difluorobenzyl)oxy]-2-methyl-N-[(2R)-1-oxohexan-2-yl]imidazo[1,2-a]pyridine-3-carboxamide (0.12 mmol, 1 equivalent) were suspended in 0.6 ml of dichloromethane, 13.3 μl of morpholine (0.132 mmol, 1.1 equivalents) were added and the mixture was stirred at RT for 3 h. 35.7 mg of sodium triacetoxyborohydride (0.168 mmol, 1.4 equivalents) were added, and the reaction mixture was stirred at RT overnight. 1 N aqueous aqueous sodium hydroxide solution were added, and the reaction mixture was extracted three times with dichloromethane. The combined organic phases were washed with saturated aqueous sodium chloride solution, dried over magnesium sulphate, filtered and concentrated. The residue obtained was dissolved in methanol and purified by preparative HPLC (Method 9). 22.4 mg (36% of theory) of the desired compound were concentrated as a glass-like solid.
LC-MS (Method 2): Rt=0.81
MS (ESpos): m/z=487.4 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.88 (t, 3H), 1.20-1.62 (m, 6H), 2.30-2.40 (m, 2H), 2.54 (s+m, 3+4H, obscured by DMSO signal), 3.50-3.60 (m, 4H), 4.13-4.24 (m, 1H), 5.31 (s, 2H), 6.92 (t, 1H), 6.99 (d, 1H), 7.23 (t, 2H), 7.59 (q, 1H), 7.63 (d, 1H), 8.50 (d, 1H).
The examples shown in Table 6 were prepared analogously to Example 64.









TABLE 6






IUPAC name / structure



Example
(yield)
Analytical data







65




LC-MS (Method 2): Rt = 0.53 min MS (ESpos): m/z = 401.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 0.88 (t, 3H), 1.20-1.62 (m, 12H), 2.20-2.54 (m, 6H), 2.54 (s, 3H, obscured by DMSO signal), 4.11-4.24 (m, 1H), 5.30 (s, 2H), 6.91 (t, 1H), 6.98 (d, 1H), 7.21 (t, 2H), 7.57 (q, 1H), 7.61 (d, 1H), 8.51 (d, 1H).


 


66




LC-MS (Method 5): Rt = 1.52 min MS (ESpos): m/z = 471.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 0.88 (t, 3H), 1.20-1.72 (m, 10H), 2.40-2.60 (m, 9H: partially obscured by DMSO signal), 4.06-4.18 (m, 1H), 5.30 (s, 2H), 6.90 (t, 1H), 6.98 (d, 1H), 7.21 (t, 2H), 7.58 (q, 1H), 7.63 (d, 1H), 8.50 (d, 1H). 


 


67




LC-MS (Method 2): Rt = 0.78 min MS (ESpos): m/z = 500.4 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 0.90 (t, 3H), 1.35-1.62 (m, 6H), 2.10 (s, 3H), 2.20-2.55 (m, 10H: partially obscured by DMSO signal), 2.56 (s, 3H), 4.10-4.21 (m, 1H), 5.30 (s, 2H), 6.90 (t, 1H), 6.98 (d, 1H), 7.21 (t, 2H), 7.58 (q, 1H), 7.63 (d, 1H), 8.50 (d, 1H).


 


68




LC-MS (Method 2): Rt = 0.79 min MS (ESpos): m/z = 445.4 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 0.88 (t, 3H), 1.25-1.65 (m, 6H), 2.18 (s, 6H), 2.20 (dd, 1H), 2.40 (dd, 1H), 2.56 (s, 3H, obscured by DMSO signal), 4.05-4.18 (m, 1H), 5.30 (s, 2H), 6.90 (t, 1H), 6.98 (d, 1H), 7.21 (t, 2H), 7.58 (q, 2H), 8.50 (d, 1H). 


 


69




LC-MS (Method 2): Rt = 0.85 min MS (ESpos): m/z = 473.4 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 0.88 (t, 3H), 0.95 (t, 6H), 1.35-1.70 (m, 6H), 2.40 (dd, 1H), 2.49-2.53 (m, 5H, superimposed by DMSO signal), 2.56 (s, 3H), 4.02-4.12 (m, 1H), 5.30 (s, 2H), 6.90 (t, 1H), 6.98 (d, 1H), 7.21 (t, 2H), 7.55-7.62 (m, 2H), 8.52 (d, 1H).


 


70




LC-MS (Method 2): Rt = 0.81 min MS (ESpos): m/z = 475.4 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 0.87 (t, 3H), 1.25-1.68 (m, 6H), 2.56 (s, 3H, superimposed by DMSO signal), 2.60-2.78 (m, 4H), 3.33 (t, 2H), 4.02-4.12 (m, 1H), 5.30 (s, 2H), 6.90 (t, 1H), 6.98 (d, 1H), 7.21 (t, 2H), 7.55-7.62 (m, 2H), 8.51 (d, 1H).









Example 71
8-[(2,6-Difluorobenzyl)oxy]-N-(9-ethyl-9-azabicyclo[3.3.1]non-3-yl)-2-methylimidazo[1,2-a]-pyridine-3-carboxamide




60 mg of N-(9-azabicyclo[3.3.1]non-3-yl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide (Example 27, 0.14 mmol) were initially charged in 1.4 ml of abs. THF, 4.2 mg of sodium hydride (purity 95%, 0.16 mmol) were added and the mixture was stirred at RT for 15 min. 0.011 ml of iodoethane (0.14 mmol) were then added dropwise, and the mixture was stirred at RT overnight. The reaction mixture was diluted with ethyl acetate and washed twice with water. The organic phase was washed with saturated aqueous sodium chloride solution, dried over sodium sulphate and filtered. The filtrate was concentrated and dried. The crude product was purified by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). The product-containing fractions were concentrated and the residue taken up in ethyl acetate and washed with saturated aqueous sodium bicarbonate solution. The organic phase was dried over sodium sulphate and filtered and the filtrate was concentrated and lyophilized. This gave 35 mg of the title compound (55% of theory).
LC-MS (Method 2): Rt=0.68 min
MS (ESpos): m/z=469 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.97 (t, 3H), 1.50 (d, 2H), 1.60-1.97 (m, 8H), 2.50 (s, 3H), 2.69 (q, 2H), 2.96 (s, 2H), 4.63-4.79 (m, 1H), 5.30 (s, 2H), 6.91 (t, 1H), 6.99 (d, 1H), 7.23 (t, 2H), 7.59 (quintet, 1H), 7.71 (d, 1H), 8.52 (d, 1H).
Example 72
N-(2-Amino-2-methylpropyl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide




100 mg of 8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid (0.31 mmol), 151 mg of (benzotriazol-1-yloxy)bisdimethylaminomethylium fluoroborate (TBTU, 0.47 mmol) and 127 mg of 4-methylmorpholine (1.26 mmol) were initially charged in 2 ml of DMF. 55 mg of 2-methylpropane-1,2-diamine (0.63 mmol) were then added, and the mixture was stirred at RT overnight. The reaction solution was purified by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). The crude product was taken up in ethyl acetate and washed twice with saturated aqueous sodium bicarbonate solution. The aqueous phase was extracted twice with ethyl acetate and the combined organic phases were dried over sodium sulphate. The mixture was then filtered and the filtrate was concentrated and lyophilized. This gave 80 mg of the title compound (66% of theory).
LC-MS (Method 2): Rt=0.55 min
MS (ESpos): m/z=389 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.08 (s, 6H), 2.00 (br s, 2H), 2.52 (s, 3H), 3.22 (d, 2H), 5.30 (s, 2H), 6.91 (t, 1H), 7.01 (d, 1H), 7.23 (t, 2H), 7.59 (quintet, 1H), 7.74 (br s, 1H), 8.64 (d, 1H).
Example 73
N-(2-Amino-2-methylpropyl)-6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide




70 mg of 6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid (0.20 mmol), 96 mg (benzotriazol-1-yloxy)bisdimethylaminomethylium fluoroborate (TBTU, 0.30 mmol) and 80 mg of 4-methylmorpholine (0.79 mmol) were initially charged in 1 ml of DMF. 35 mg of 2-methylpropane-1,2-diamine (0.40 mmol) were then added, and the mixture was stirred at RT overnight. The reaction solution was purified by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). The product was taken up in ethyl acetate and washed twice with saturated aqueous sodium bicarbonate solution. The aqueous phase was extracted twice with ethyl acetate, the combined organic phases were dried over sodium sulphate and filtered. The filtrate was concentrated and lyophilized. This gave 38 mg of the title compound (45% of theory).
LC-MS (Method 1): Rt=0.88 min
MS (ESpos): m/z=423 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.05 (s, 6H), 2.04 (br s, 2H), 2.50 (s, 3H), 3.22 (d, 2H), 5.35 (s, 2H), 7.20 (d, 1H), 7.24 (t, 2H), 7.61 (quintet, 1H), 7.80 (br s, 1H), 8.75 (d, 1H).
Example 74
N-(2-Amino-2-methylpropyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxamide




100 mg of 8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylic acid (0.30 mmol), 145 mg of (benzotriazol-1-yloxy)bisdimethylaminomethylium fluoroborate (TBTU, 0.45 mmol) and 122 mg of 4-methylmorpholine (1.20 mmol) were initially charged in 1.9 ml of DMF. 53 mg of 2-methylpropane-1,2-diamine (0.60 mmol) were then added, and the mixture was stirred at RT overnight. The reaction solution was purified by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). The product fractions were taken up in dichloromethane and washed with saturated aqueous sodium bicarbonate solution. The aqueous phase was extracted twice with dichloromethane. The combined organic phases were dried over sodium sulphate, filtered, concentrated and lyophilized. This gave 94 mg of the title compound (78% of theory).
LC-MS (Method 2): Rt=0.61 min
MS (ESpos): m/z=403 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.05 (s, 6H), 1.53 (br s, 2H), 2.31 (s, 3H), 2.52 (s, 3H), 3.20 (d, 2H), 5.29 (s, 2H), 6.91 (s, 1H), 7.24 (t, 2H), 7.59 (quintet, 1H), 7.64-7.72 (m, 1H), 8.47 (s, 1H).
Example 75
rac-8-[(2,6-Difluorobenzyl)oxy]-2-methyl-N-(1,2,3,4-tetrahydroquinolin-3-yl)imidazo[1,2-a]-pyridine-3-carboxamide




70 mg of 8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid (0.22 mmol), 54 mg of (benzotriazol-1-yloxy)bisdimethylaminomethylium fluoroborate (TBTU, 0.26 mmol) and 133 mg of 4-methylmorpholine (1.32 mmol) were initially charged in 1.5 ml of dichloromethane. After 10 min at RT, 53 mg of 1,2,3,4-tetrahydroquinoline-3-amine (0.24 mmol) were added, and the mixture was stirred at RT overnight. About 5 ml of water were added, the reaction solution was stirred for another 30 min and the resulting precipitate was filtered off, washed thoroughly with water and dried under high vacuum. The crude product was purified by preparative thin-layer chromatography (dichloromethane/methanol 20:1). This gave 52 mg of the title compound (52% of theory).
LC-MS (Method 2): Rt=0.88 min
MS (ESpos): m/z=449 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=2.39 (s, 3H), 2.79-2.88 (m, 1H), 2.91-2.99 (m, 1H), 3.09-3.18 (m, 1H), 3.32-3.40 (m, 1H), 4.21-4.30 (m, 1H), 5.30 (s, 2H), 5.70 (s, 1H), 6.47 (t, 1H), 6.51 (d, 1H), 6.90 (d, 2H), 6.93 (t, 1H), 7.01 (d, 1H), 7.23 (t, 2H), 7.59 (quintet, 1H), 7.63 (d, 1H), 8.61 (d, 1H).
The examples shown in Table 7 were prepared analogously to Example 75 by reacting the appropriate carboxylic acid with the appropriate commercially available amines under the reaction conditions described in the Representative Working Procedure 2.









TABLE 7






IUPAC name / structure



Example
(yield)
Analytical data







76




LC-MS (Method 2): Rt = 0.90 min MS (ESpos): m/z = 463 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 2.32 (s, 3H), 2.38 (s, 3H), 2.79- 2.88 (m, 1H), 2.91-2.99 (m, 1H), 3.09-3.18 (m, 1H), 3.32-3.40 (m, 1H), 4.20-4.29 (m, 1H), 5.28 (s, 2H), 5.80 (s, 1H), 6.48 (t, 1H), 6.52 (d, 1H), 6.86-6.92 (m, 3H), 7.23 (t, 2H), 7.55-7.64 (m, 2H), 8.42 (s, 1H).


 


77




LC-MS (Method 5): Rt = 1.28 min MS (ESpos): m/z = 457 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.14 (d, 3H), 1.21-1.48 (m, 3H), 1.73 (t, 2H), 2.00 (br s, 2H), 2.27 (br s, 3H), 2.30 (s, 3H), 2.48 (s, 3H), 2.85-2.98 (m, 2H), 3.91 (sextet, 1H), 5.28 (s, 2H), 6.88 (s, 1H), 7.23 (t, 2H), 7.59 (quintet, 1H), 7.68 (d, 1H), 8.31 (s, 1H). 


 


78




LC-MS (Method 2): Rt = 0.70 min MS (ESpos): m/z = 477 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.14 (d, 3H), 1.16-1.44 (m, 3H), 1.60-1.86 (m, 4H), 2.14 (s, 3H), 2.50 (s, 3H), 2.79 (d, 2H), 3.91 (sextet, 1H), 5.34 (s, 2H), 7.18 (s, 1H), 7.22 (t, 2H), 7.60 (quintet, 1H), 7.69 (d, 1H), 8.61 (s, 1H).


 


79




LC-MS (Method 2): Rt = 0.88 min MS (ESpos): m/z = 455 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 2.50 (s, 3H), 3.20 (q, 2H), 3.47 (q, 2H), 5.30 (s, 2H), 5.69 (t, 1H), 6.60 (dd, 2H), 6.88-6.97 (m, 3H), 7.02 (d, 1H), 7.23 (t, 2H), 7.59 (quintet, 1H), 7.88 (t, 1H), 8.68 (d, 1H). 


 


80




LC-MS (Method 2): Rt = 0.70 min MS (ESpos): m/z = 463 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 2.43 (s, 3H), 2.67-2.75 (m, 2H), 2.84-2.91 (m, 1H), 3.06-3.16 (m, 1H), 3.555-3.70 (m, 2H), 4.12 (dd, 1H), 5.29 (s, 2H), 6.91 (t, 1H), 7.02 (d, 1H), 7.07-7.18 (m, 3H), 7.19-7.28 (m, 3H), 7.59 (quintet, 1H), 7.69 (t, 1H), 8.70 (d, 1H).





a) There was a second chromatographic separation: [column: Sunfire C18, 5 μm, 250 × 20 mm, mobile phase: 60% water, 35% methanol + 5% 1% strength aqueous TFA soln., flow rate: 25 ml/min; 25° C., detection: 210 nm].






Example 81
ent-8-[(2,6-Difluorobenzyl)oxy]-2-methyl-N-(1,2,3,4-tetrahydroquinolin-3-yl)imidazo[1,2-a]-pyridine-3-carboxamide (enantiomer A)




38 mg of Example 75 were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak AY-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine, flow rate: 15 ml/min; 40° C., detection: 220 nm].
Enantiomer A:
Yield: 18 mg (99% ee)
Rt=5.75 min [Daicel Chiralpak AY-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 40° C.; detection: 220 nm].
Example 82
8-[(2,6-Difluorobenzyl)oxy]-2-methyl-N-(2,2,6,6-tetramethylpiperidin-4-yl)imidazo[1,2-a]-pyridine-3-carboxamide 




18.8 mg (0.12 mmol) of 2,2,6,6-tetramethylpiperidine-4-amine were initially charged, and 32 mg (0.10 mmol) of 8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid in 0.4 ml of DMF and 42 mg (0.13 mmol) of (benzotriazol-1-yloxy)bisdimethylaminomethylium fluoroborate (TBTU) in 0.2 ml of DMF were added. 20 mg (0.20 mmol) of 4-methylmorpholine were then added, and the reaction was stirred at RT overnight. The mixture was then filtered off and the filtrate was purified by preparative LC-MS (Method 12). The product-containing fractions were concentrated under reduced pressure. This gave 27 mg (59% of theory) of the target product.
LC-MS (Method 8): Rt=0.69 min;
MS (ESIpos): m/z=457 (M+H)+
The compounds listed in Table 8 were prepared analogously to Example 82.









TABLE 8






IUPAC name / structure



Example
(yield)
Analytical data







83




LC-MS (Method 8): Rt = 0.69 min MS (ESpos): m/z = 471 (M + H)+ 


 


84




LC-MS (Method 8): Rt = 0.64 min MS (ESpos): m/z = 415 (M + H)+


 


85




LC-MS (Method 8): Rt = 0.75 min MS (ESpos): m/z = 477 (M + H)+ 


 


86




LC-MS (Method 8): Rt = 0.63 min MS (ESpos): m/z = 389 (M + H)+


 


87




LC-MS (Method 8): Rt = 0.63 min MS (ESpos): m/z = 403 (M + H)+ 


 


88




LC-MS (Method 8): Rt = 0.75 min MS (ESpos): m/z = 445 (M + H)+


 


89




LC-MS (Method 8): Rt = 0.65 min MS (ESpos): m/z = 431 (M + H)+ 


 


90




LC-MS (Method 8): Rt = 0.66 min MS (ESpos): m/z = 455 (M + H)+


 


91




LC-MS (Method 8): Rt = 0.65 min MS (ESpos): m/z = 441 (M + H)+ 


 


92




LC-MS (Method 8): Rt = 0.65 min MS (ESpos): m/z = 427 (M + H)+









Example 93
ent-N-(1-Amino-3-isopropoxypropan-2-yl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer A) 




114 mg of Example 63 were dissolved in 2.5 ml of ethanol and separated into the enantiomers on a chiral phase [column: Daicel Chiralpak OD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% ethanol, flow rate: 20 ml/min; 25° C., detection: 230 nm].
Yield enantiomer A: 44 mg (100% ee)
Enantiomer A: Rt=4.33 min [Daicel Chiralpak OD-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% ethanol; flow rate 1.0 ml/min; 40° C.; detection: 220 nm].
1H NMR (400 MHz, DMSO-d6): δ=1.10 (d, 6H), 1.68 (br. s, 2H), 2.54 (s, 3H; superimposed by DMSO signal), 2.72 (d, 2H), 3.49 (d, 2H), 3.58 (q, 1H), 3.99 (m, 1H), 5.30 (s, 2H), 6.91 (t, 1H), 7.01 (d, 1H), 7.23 (t, 2H), 7.53 (br. s, 1H), 7.58 (q, 1H), 8.60 (d, 1H).
Example 94
8-[(2,6-Difluorobenzyl)oxy]-2,6-dimethyl-N-{2-methyl-2-[(2,2,2-trifluoroethyl)amino]propyl}-imidazo[1,2-a]pyridine-3-carboxamide 




100 mg (0.25 mmol) of N-(2-amino-2-methylpropyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxamide (Example 74) were initially charged in 2 ml of DMF, 0.041 ml (0.25 mmol) of 2,2,2-trifluoroethyl trichloromethanesulphonate, 69 mg (0.50 mmol) of potassium carbonate and 4.1 mg (0.025 mmol) of potassium iodide were added and the mixture was then stirred at RT overnight. 0.082 ml (0.50 mmol) of 2,2,2-trifluoroethyl trichloromethanesulphonate was then added, and the mixture was once more stirred at RT overnight. Another 0.123 ml (0.75 mmol) of 2,2,2-trifluoroethyl trichloromethanesulphonate were added, and the mixture was once more stirred at RT overnight. For work-up, 1 ml of water was added, the mixture was filtered through an Extrelut cartridge, eluted with dichloromethane, and the filtrate was concentrated. The crude product was purified by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.5% ammonium hydroxide). The product fractions were combined, evaporated and dried under high vacuum.
Yield: 48 mg (38% of theory)
LC-MS (Method 2): Rt=0.96 min
MS (ESpos): m/z=485.4 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.05 (s, 6H), 2.31 (s, 3H), 2.37 (t, 1H), 2.54 (s, 3H; obscured by DMSO signal), 3.18-3.30 (m, 4H), 5.28 (s, 2H), 6.92 (s, 1H), 7.19-7.29 (m, 2H), 7.50 (t, 1H), 7.54-7.64 (m, 1H), 8.50 (s, 1H).
Example 95
ent-N-(3-Amino-2-methylpropyl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide dihydrochloride (enantiomer A) 




68 mg of ent-tert-butyl {3-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]-2-methylpropyl}carbamate (Example 213A, 0.14 mmol, 1 equivalent) were dissolved in 2 ml of 4 N hydrochloric acid in 1,4-dioxane (1.4 mmol, 10 equivalents) and stirred at RT overnight. The mixture was then concentrated and dried under reduced pressure. This gave 48 mg (75% of theory; purity 100%) of the title compound.
LC-MS (Method 2): Rt=0.56 min
MS (ESpos): m/z=389.2 (M−2HCl+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.99 (d, 3H), 2.05-2.17 (m, 1H), 2.62 (s, 3H), 2.65-2.75 (m, 1H), 2.83-2.93 (m, 1H), 3.32 (t, 2H), 5.43 (s, 2H), 7.21-7.37 (m, 3H), 7.47 (br. s, 1H), 7.56-7.68 (m, 1H), 7.98 (br. s, 3H), 8.56 (br. s, 1H), 8.68 (d, 1H).
Example 96
ent-N-(3-Amino-2-methylpropyl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide dihydrochloride (enantiomer B) 




79 mg of ent-tert-butyl {3-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]-2-methylpropyl}carbamate (Example 214A, 0.16 mmol, 1 equivalent) were dissolved in 2 ml of 4 N hydrochloric acid in 1,4-dioxane (1.6 mmol, 10 equivalents) and stirred at RT overnight. The mixture was then concentrated and dried under reduced pressure. This gave 66 mg (88.5% of theory; purity 100%) of the title compound.
LC-MS (Method 2): Rt=0.55 min
MS (ESpos): m/z=389.2 (M−2HCl+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.99 (d, 3H), 2.06-2.19 (m, 1H), 2.63 (s, 3H), 2.66-2.75 (m, 1H), 2.83-2.94 (m, 1H), 3.31 (t, 2H), 5.43 (s, 2H), 7.26 (t, 2H), 7.36 (br. s, 1H), 7.48-7.67 (m, 2H), 8.03 (br. s, 2H), 8.62 (br. s, 1H), 8.71 (d, 1H).
Example 97
ent-N-[2-Amino-1-(3,4-difluorophenyl)ethyl]-8-{[(2,6-difluorophenyl)(2H2)methyl]oxy}-2-methylimidazo[1,2-a]pyridine-3-carboxamide 




At RT, 250 mg of ent-tert-butyl [2-(3,4-difluorophenyl)-2-{[(8-{[(2,6-difluorophenyl)-(2H2)methyl]oxy}-2-methylimidazo[1,2-a]pyridin-3-yl)carbonyl]amino}ethyl]carbamate (Example 170A, 0.44 mmol, 1 equivalent) were dissolved in 4.4 ml of 4 N hydrochloric acid in 1,4-dioxane (17.4 mmol, 40 equivalents), and the mixture was stirred at RT for 3 h. The mixture was then concentrated, water and saturated aqueous ammonia solution were added to the residue and the mixture was extracted four times with ethyl acetate. The combined organic phases were washed with saturated aqueous sodium chloride solution, dried over magnesium sulphate and concentrated. The crude product obtained in this manner was applied to Extrelut® and purified on a silica gel cartridge (Biotage SNAP Cartridge KP-Sil 10 g, mobile phase: dichloromethane/methanol: from 95:5 to 0:100). This gave 198 mg (95% of theory; purity 99%) of the title compound.
LC-MS (Method 7): Rt=0.71 min
MS (ESpos): m/z=475.1 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.70 (br. s, 2H), 2.59 (s, 3H), 2.86-2.94 (m, 2H), 4.92-5.01 (m, 1H), 6.91 (t, 1H), 7.01 (d, 1H), 7.20-7.28 (m, 3H), 7.36-7.50 (m, 2H), 7.54-7.63 (m, 1H), 8.18 (br. s, 1H), 8.53 (d, 1H).
Example 98
ent-N-[2-Amino-1-(3,4-difluorophenyl)ethyl]-8-[(2-fluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide 




At RT, 0.8 ml of 4 N hydrochloric acid in 1,4-dioxane (3.1 mmol, 10 equivalents) were added to 191 mg of ent-tert-butyl {2-(3,4-difluorophenyl)-2-[({8-[(2-fluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]ethyl}carbamate (Example 197A, 0.3 mmol, 1 equivalent). The mixture was stirred at RT overnight and then concentrated. The residue was taken up in ethyl acetate and washed with saturated aqueous sodium bicarbonate solution. The organic phase was dried over magnesium sulphate and concentrated. This gave 101 mg (69% of theory; purity 97%) of the title compound.
LC-MS (Method 7): Rt=0.69 min
MS (ESpos): m/z=455.1 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.70 (br. s, 2H); 2.61 (s, 3H), 2.83-2.93 (m, 2H), 4.96 (t, 1H), 5.33 (s, 2H), 6.92 (t, 1H), 6.99 (d, 1H), 7.19-7.34 (m, 3H), 7.35-7.53 (m, 3H), 7.62 (t, 1H), 8.20 (br. s, 1H), 8.51 (d, 1H).
The compounds listed in Table 9 were prepared analogously to Example 98 from the appropriate Boc-protected amines.









TABLE 9






IUPAC name / structure



Example
(yield)
Analytical data







 99




LC-MS (Method 7): Rt = 0.72 min MS (ESpos): m/z = 473.1 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.70 (br. s, 2H), 2.62 (s, 3H), 2.85-2.93 (m, 2H), 4.99 (t, 1H), 5.39 (s, 2H), 6.89 (t, 1H), 6.97 (d, 1H), 7.21-7.34 (m, 2H), 7.36-7.56 (m, 4H), 8.20 (br. s, 1H), 8.52 (d, 1H). 


 


100




LC-MS (Method 7): Rt = 0.72 min MS (ESpos): m/z = 491.1 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.70 (br. s, 2H), 2.60 (s, 3H), 2.85-2.92 (m, 2H), 4.95 (t, 1H), 5.36 (s, 2H), 6.91 (t, 1H), 7.01 (d, 1H), 7.19-7.33 (m, 2H), 7.35-7.51 (m, 2H), 7.60-7.72 (m, 1H), 8.20 (br. s, 1H), 8.54 (d, 1H).


 


101




LC-MS (Method 7): Rt = 0.74 min MS (ESpos): m/z = 491.1 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.70 (br. s, 2H), 2.60 (s, 3H), 2.88 (d, 2H), 4.95 (t, 1H), 5.28 (s, 2H), 6.91 (t, 1H), 7.00 (d, 1H), 7.19-7.28 (m, 1H), 7.30-7.50 (m, 4H), 8.19 (br. s, 1H), 8.54 (d, 1H).


 


102




LC-MS (Method 7): Rt = 0.76 min MS (ESpos): m/z = 489.1 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.70 (br. s, 2H), 2.59 (s, 3H), 2.84-2.93 (m, 2H), 4.96 (t, 1H), 5.34 (s, 2H), 6.93 (t, 1H), 7.03 (d, 1H), 7.21-7.27 (m, 1H), 7.33-7.51 (m, 4H), 7.53-7.62 (m, 1H), 8.18 (br. s, 1H), 8.54 (d, 1H).


 


103




LC-MS (Method 7): Rt = 0.60 min MS (ESpos): m/z = 403.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 0.87 (s, 6H), 1.08 (br. s, 2H), 2.41 (s, 2H), 3.21 (d, 2H), 5.30 (s, 2H), 6.93 (t, 1H), 7.01 (d, 1H), 7.23 (t, 2H), 7.53-7.65 (m, 1H), 8.21 (t, 1H), 8.62 (d, 1H).





1)reaction without addition of solvent, with 20 equivalents of 4 M hydrochloric acid in 1,4-dioxane.






Example 104
N-(3-Amino-3-methylbutyl)-6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide




118 mg of tert-butyl {4-[({6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]-2-methylbutan-2-yl}carbamate trifluoroacetate (Example 179A, 0.22 mmol, 1 equivalent) were initially charged in 4 ml of 2 N hydrochloric acid in diethyl ether (8 mmol, 36 equivalents) and stirred at RT overnight. The resulting precipitate was filtered off, washed thoroughly with diethyl ether and then dissolved in ethyl acetate. The organic phase was washed twice with saturated aqueous sodium bicarbonate solution and with water. The aqueous phase was extracted twice with dichloroethane and the combined organic phases were dried over sodium sulphate, filtered and concentrated. This gave 65.5 mg (68% of theory, purity 99%) of the target compound.
LC-MS (Method 2): Rt=0.75 min
MS (ESpos): m/z=437.3 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.09 (s, 6H), 1.59 (t, 2H), 2.10 (br. s, 2H), 3.40 (t, 2H), 5.33 (s, 2H), 7.20 (d, 1H), 7.26 (t, 2H), 7.55-7.65 (m, 1H), 8.42 (br. s, 1H), 8.84 (d, 1H), [further signal hidden under the solvent peaks].
The compounds listed in Table 10 were prepared analogously to Example 104 from the appropriate Boc-protected amines. 10-40 equivalents of 2 N hydrochloric acid were used. For work-up of the reaction, any solid formed was dissolved in ethyl acetate or dichloromethane/methanol and processed further in an analogous manner.









TABLE 10






IUPAC name / structure



Example
(yield)
Analytical data







105




LC-MS (Method 2): Rt = 0.86 min MS (ESpos): m/z = 467.2 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.94-2.03 (m, 2H), 3.20-3.27 (m, 2H), 5.14-5.23 (m, 1H), 5.31 (s, 2H), 5.82 (s, 1H), 6.48-6.54 (m, 1H), 6.81 (dt, 1H), 6.88-6.94 (m, 1H), 6.96 (d, 1H), 7.02 (d, 1H), 7.23 (t, 2H), 7.54-7.64 (m, 1H), 8.31 (d, 1H), 8.58 (d, 1H), [further signal hidden under DMSO peak].


 


106




LC-MS (Method 2): Rt = 0.86 min MS (ESpos): m/z = 467.2 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.93-2.05 (m, 2H), 3.19-3.27 (m, 2H), 5.14-5.23 (m, 1H), 5.31 (s, 2H), 5.83 (s, 1H), 6.48-6.54 (m, 1H), 6.81 (dt, 1H), 6.88-6.94 (m, 1H), 6.96 (d, 1H), 7.02 (d, 1H), 7.24 (t, 2H), 7.54-7.65 (m, 1H), 8.30 (d, 1H), 8.58 (d, 1H), [further signal hidden under DMSO peak]. 


 


107




LC-MS (Method 2): Rt = 0.81 min MS (ESpos): m/z = 483.2 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 2.46 (s, 3H), 2.97 (dd, 1H), 3.18 (dd, 1H), 3.80-3.96 (m, 2H), 5.13-5.21 (m, 1H), 5.35 (s, 2H), 7.05-7.11 (m, 1H), 7.17-7.29 (m, 5H), 7.36-7.41 (m, 1H), 7.56-7.65 (m, 1H), 8.26 (d, 1H), 8.74 (d, 1H).


 


108




LC-MS (Method 2): Rt = 0.81 min MS (ESpos): m/z = 483.2 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 2.46 (s, 3H), 2.97 (dd, 1H), 3.18 (dd, 1H), 3.80-3.96 (m, 2H), 5.13-5.22 (m, 1H), 5.35 (s, 2H), 7.05-7.11 (m, 1H), 7.16-7.29 (m, 5H), 7.36-7.41 (m, 1H), 7.56-7.65 (m, 1H), 8.26 (d, 1H), 8.74 (d, 1H). 


 


109




LC-MS (Method 7): Rt = 0.65 min MS (ESpos): m/z = 449.2 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 2.47 (s, 3H), 2.97 (dd, 1H), 3.18 (dd, 1H), 3.81-3.96 (m, 2H), 5.14-5.22 (m, 1H), 5.30 (s, 2H), 6.96 (t, 1H), 7.02 (d, 1H), 7.06-7.11 (m, 1H), 7.16-7.28 (m, 4H), 7.35-7.41 (m, 1H), 7.54-7.64 (m, 1H), 8.17 (d, 1H), 8.64 (d, 1H), [further signal hidden under solvent peaks].


 


110




LC-MS (Method 7): Rt = 0.69 min MS (ESpos): m/z = 449.2 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 2.47 (s, 3H), 2.97 (dd, 1H), 3.18 (dd, 1H), 3.81-3.96 (m, 2H), 5.15-5.22 (m, 1H), 5.30 (s, 2H), 6.96 (t, 1H), 7.02 (d, 1H), 7.06-7.11 (m, 1H), 7.16-7.29 (m, 4H), 7.35-7.40 (m, 1H), 7.54-7.64 (m, 1H), 8.17 (d, 1H), 8.64 (d, 1H), [further signal hidden under solvent peaks]. 


 


111




LC-MS (Method 7): Rt = 1.02 min MS (ESpos): m/z = 517.1 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.91-2.09 (m, 2H), 5.18-5.26 (m, 1H), 5.32 (s, 2H), 6.62 (d, 1H), 6.70 (s, 1H), 6.96 (t, 1H), 7.02 (d, 1H), 7.20-7.29 (m, 3H), 7.37 (s, 1H), 7.53-7.65 (m, 1H), 8.35 (d, 1H), 8.56 (d, 1H), [further signals hidden under solvent peaks].


 


112




LC-MS (Method 7): Rt = 1.02 min MS (ESpos): m/z = 517.1 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.91-2.08 (m, 2H), 5.18-5.27 (m, 1H), 5.32 (s, 2H), 6.62 (d, 1H), 6.70 (s, 1H), 6.96 (t, 1H), 7.02 (d, 1H), 7.20-7.29 (m, 3H), 7.37 (s, 1H), 7.53-7.65 (m, 1H), 8.35 (d, 1H), 8.56 (d, 1H), [further signals hidden under solvent peaks]. 


 


113




LC-MS (Method 7): Rt = 0.56 min MS (ESpos): m/z = 375.2 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.62 (br. s, 2H), 2.31 (s, 3H), 2.71 (t, 2H), 5.27 (s, 2H), 6.91 (s, 1H), 7.24 (t, 2H), 7.54-7.65 (m, 1H), 7.72-7.81 (m, 1H), 8.46 (s, 1H), [further signals hidden under solvent peaks].


 


114




LC-MS (Method 2): Rt = 0.62 min MS (ESpos): m/z = 417.4 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.08 (s, 6H), 1.58 (t, 2H), 1.78 (br. s, 2H), 2.31 (s, 3H), 3.36-3.43 (m, 2H), 5.28 (s, 2H), 6.91 (s, 1H), 7.24 (t, 2H), 7.54-7.64 (m, 1H), 8.25-8.31 (m, 1H), 8.53 (s, 1H), [further signal hidden under solvent peak]. 


 


115




LC-MS (Method 2): Rt = 0.63 min MS (ESpos): m/z = 415.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.34-1.45 (m, 1H), 1.55-1.71 (m, 2H), 1.72-1.84 (m, 1H), 2.31 (s, 3H), 2.70-2.87 (m, 2H), 3.17-3.28 (m, 3H), 5.28 (s, 2H), 6.92 (s, 1H), 7.23 (t, 2H), 7.54-7.64 (m, 1H), 7.71-7.78 (m, 1H), 8.46 (s, 1H), [further signal hidden under solvent peak].


 


116




LC-MS (Method 2): Rt = 0.64 min MS (ESpos): m/z = 415.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.34-1.45 (m, 1H), 1.55-1.71 (m, 2H), 1.72-1.84 (m, 1H), 2.31 (s, 3H), 2.71-2.87 (m, 2H), 3.17-3.28 (m, 3H), 5.28 (s, 2H), 6.92 (s, 1H), 7.23 (t, 2H), 7.54-7.64 (m, 1H), 7.71-7.79 (m, 1H), 8.46 (s, 1H), [further signal hidden under solvent peak]. 


 


117




LC-MS (Method 2): Rt = 0.59 min MS (ESpos): m/z = 403.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.08 (s, 6H), 1.58 (t, 2H), 1.79 (br. s, 2H), 3.37-3.45 (m, 2H), 5.30 (s, 2H), 6.93 (t, 1H), 7.01 (d, 1H), 7.23 (t, 2H), 7.54-7.64 (m, 1H), 8.28-8.36 (m, 1H), 8.70 (d, 1H), [further signal hidden under solvent peak].


 


118




LC-MS (Method 7): Rt = 0.73 min MS (ESpos): m/z = 449.1 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 0.99-1.13 (m, 1H), 1.21-1.37 (m, 2H), 1.45-1.53 (m, 1H), 1.62 (d, 1H), 1.74 (br. s., 1H), 2.16 (br. s, 1H), 2.59-2.70 (m, 1H), 2.94 (d, 1H), 3.17-3.27 (m, 2H), 5.35 (s, 2H), 7.18 (s, 1H), 7.24 (t, 2H), 7.54-7.65 (m, 1H), 7.83 (t, 1H), 8.76 (s, 1H), [further signals hidden under solvent peaks].


 


119




LC-MS (Method 2): Rt = 0.58 min MS (ESpos): m/z = 429.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.31-1.42 (m, 2H), 1.49-1.62 (m, 6H), 1.66-1.79 (m, 2H), 2.31 (s, 3H), 5.28 (s, 2H), 6.91 (s, 1H), 7.24 (t, 2H), 7.53-7.64 (m, 1H), 7.66-7.74 (m, 1H), 8.46 (s, 1H), [further signals hidden under solvent peaks].





1) The reaction was carried out using 10 equivalents of 2 M hydrochloric acid in diethyl ether.


2) The reaction was carried out using 56 equivalents of 2 M hydrochloric acid in diethyl ether.


3) The reaction was carried out using 31 equivalents of 2 M hydrochloric acid in diethyl ether.






Example 120
N-[(3S)-3-Aminobutan-2-yl]-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide




155 mg of benzyl {(2S)-3-[({6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]butan-2-yl}carbamate (Example 191A, 0.28 mmol, 1 equivalent) were dissolved in 50 ml of ethanol, and 40 mg of palladium on activated carbon (5%) were added. The mixture was hydrogenated at RT and standard pressure for 3 h. After the reaction had ended, the mixture was filtered through silica gel, the residue was washed with ethanol and the mother liquor was concentrated under reduced pressure. The crude product obtained was purified by preparative HPLC (Method 9).
LC-MS (Method 2): Rt=0.55 min
MS (ESpos): m/z=389.2 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.01 (d, 3H), 1.15 (d, 3H), 1.80 (br. s, 2H), 2.50 (s, 3H; superimposed by DMSO signal), 2.82-2.96 (m, 1H), 3.81-3.95 (m, 1H), 5.30 (s, 2H), 6.92 (t, 1H), 7.01 (d, 1H), 7.23 (t, 2H), 7.47-7.54 (m, 1H), 7.55-7.63 (m, 1H), 8.64 (d, 1H).
Example 121
N-[(3R)-3-Aminobutan-2-yl]-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide 




235 mg of benzyl {(2R)-3-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]butan-2-yl}carbamate (Example 184A, 0.45 mmol, 1 equivalent) were dissolved in 260 ml of ethanol, and 63 mg of palladium on activated carbon (10%, 0.45 mmol, 1 equivalent) were added. The mixture was hydrogenated at RT under atmospheric pressure for 1.5 h and then filtered through silica gel and concentrated. The residue was dissolved in methanol and purified by preparative HPLC (Method 9). This gave 96 mg (55% of theory) of the title compound.
Diastereomer ratio 3:1
Main Diastereomer:
LC-MS (Method 2): Rt=0.55 min
MS (ESpos): m/z=389.2 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.01 (d, 3H), 1.15 (d, 3H), 1.65 (br. s, 2H), 2.51 (s, 3H; superimposed by DMSO signal), 2.82-2.96 (m, 1H), 3.81-3.95 (m, 1H), 5.30 (s, 2H), 6.92 (t, 1H), 7.01 (d, 1H), 7.23 (t, 2H), 7.47-7.54 (m, 1H), 7.55-7.63 (m, 1H), 8.64 (d, 1H).
Example 122
ent-N-(1-Amino-3-methoxypropan-2-yl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide ditrifluoroacetate (enantiomer A) 




mg of ent-benzyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]-3-methoxypropyl}carbamate (Example 210A, enantiomer A, 0.1 mmol, 1 equivalent) were dissolved in 10 ml of ethanol, and 10 mg of palladium hydroxide on activated carbon (10%) were added. The mixture was hydrogenated at RT under atmospheric pressure for 3 h and then filtered through silica gel. The residue was washed with ethanol, ethyl acetate and dichloromethane and the organic phase was concentrated. The residue was purified by preparative HPLC (column: Sunfire C18, 5 μm, 250×20 mm, flow rate: 25 ml, wavelength: 210 nm, temperature 40° C., mobile phase: acetonitrile:water+1% TFA=20:80). This gave 27 mg (43% of theory, purity 100%) of the title compound.
LC-MS (Method 2): Rt=0.58 min
MS (ESpos): m/z=405.3 (M−2TFA+H)+
1H NMR (400 MHz, DMSO-d6): δ=2.91-3.03 (m, 1H), 3.05-3.16 (m, 1H), 3.32 (s, 3H), 3.45-3.54 (m, 2H), 4.36-4.51 (m, 1H), 5.33 (s, 2H), 7.05-7.12 (m, 1H), 7.15-7.20 (m, 1H), 7.24 (t, 2H), 7.53-7.65 (m, 1H), 7.85 (br. s, 4H), 8.62 (d, 1H), [further signals hidden under solvent peaks].
Example 123
ent-N-(1-Amino-3-methoxypropan-2-yl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide ditrifluoroacetate (enantiomer B) 




53 mg of ent-benzyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]-3-methoxypropyl}carbamate (Example 211A, enantiomer B, 0.1 mmol, 1 equivalent) were hydrogenated and worked up analogously to Example 122. This gave 22 mg (36% of theory; purity 100%) of the title compound.
LC-MS (Method 2): Rt=0.58 min
MS (ESpos): m/z=405.3 (M−2TFA+H)+
1H NMR (400 MHz, DMSO-d6): δ=2.91-3.03 (m, 1H), 3.05-3.16 (m, 1H), 3.32 (s, 3H), 3.45-3.54 (m, 2H), 4.36-4.51 (m, 1H), 5.33 (s, 2H), 7.05-7.12 (m, 1H), 7.15-7.20 (m, 1H), 7.24 (t, 2H), 7.53-7.65 (m, 1H), 7.85 (m, 4H), 8.62 (d, 1H), [further signals hidden under solvent peaks].
Example 124
ent-N-[1-Amino-3-(3,4-difluorophenoxy)propan-2-yl]-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide ditrifluoroacetate 




110 mg of ent-benzyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]-3-(3,4-difluorophenoxy)propyl}carbamate (Example 212A, Enantiomer B) were hydrogenated and worked up analogously to Example 122. This gave 69 mg (55% of theory; purity 100%) of the title compound.
LC-MS (Method 2): Rt=0.87 min
MS (ESpos): m/z=503.2 (M−2TFA+H)+
1H NMR (400 MHz, DMSO-d6): δ=3.03-3.15 (m, 1H), 3.16-3.27 (m, 1H), 4.12-4.22 (m, 2H), 4.58-4.70 (m, 1H), 5.33 (s, 2H), 6.80-6.87 (m, 1H), 7.01-7.09 (m, 1H), 7.10-7.19 (m, 2H), 7.24 (t, 2H), 7.34-7.44 (m, 1H), 7.54-7.64 (m, 1H), 7.88-8.05 (m, 4H), 8.62 (d, 1H), [further signal hidden under solvent peaks].
Example 125
rac-N-(3-Azabicyclo[4.1.0]hept-1-yl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide 




216 mg of rac-benzyl 1-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]-3-azabicyclo[4.1.0]heptan-3-carboxylate (Example 176A, 0.4 mmol, 1 equivalent) were reacted [0.2 equivalents of palladium on activated carbon (10%), reaction time: 16 h] and worked up analogously to Example 121 [After the separation by HPLC, the residue was taken up in ethyl acetate and washed twice with saturated aqueous sodium bicarbonate solution. The aqueous phase was extracted with ethyl acetate. The combined organic phases were dried over sodium sulphate, filtered and concentrated]. This gave 123 mg (74% of theory; 98%) of the title compound.
LC-MS (Method 7): Rt=0.56 min
MS (ESpos): m/z=413.1 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.92 (t, 1H), 0.96-1.02 (m, 1H), 1.22-1.31 (m, 1H), 1.57-1.68 (m, 1H), 2.01-2.11 (m, 1H), 2.45 (s, 3H), 2.59-2.76 (m, 2H), 3.19-3.29 (m, 2H), 5.30 (s, 2H), 5.79 (br. s, 1H), 6.94 (t, 1H), 7.02 (d, 1H), 7.23 (t, 2H), 7.53-7.63 (m, 1H), 8.24 (s, 1H), 8.60 (d, 1H).
Example 126
ent-N-(2-Amino-4,4,4-trifluorobutyl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer A) 




Under argon, 170 mg of ent-benzyl {1-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridin-3-yl}carbonyl)amino]-4,4,4-trifluorobutan-2-yl}carbamate (Example 215A, 0.30 mmol, 1 equivalent) were initially charged in 3 ml of ethanol/dichloroethane (2/1), 31 mg of palladium on activated carbon (10%) and 0.60 ml (5.90 mmol, 20 equivalents) of cyclohexene were added and the mixture was stirred under reflux overnight. The reaction solution was filtered through a Millipore® filter, washed thoroughly with ethanol/dichloroethane (2/1), concentrated and dried under high vacuum. The product was purified by silica gel chromatography (mobile phase: dichloromethane/methanol:40/1 isocratic). This gave 92 mg (67% of theory; 95%) of the title compound.
LC-MS (Method 7): Rt=0.62 min
MS (ESpos): m/z=443.2 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.85 (br. s, 2H), 2.15-2.38 (m, 1H), 2.40-2.47 (m, 1H), 3.15-3.28 (m, 2H), 5.30 (s, 2H), 6.94 (t, 1H), 7.01 (d, 1H), 7.24 (t, 2H), 7.54-7.64 (m, 1H), 7.89 (t, 1H), 8.64 (d, 1H), [further signals hidden under solvent peaks].
Example 127
ent-N-(2-Amino-4,4,4-trifluorobutyl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer B) 




172 mg of ent-benzyl {1-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]-4,4,4-trifluorobutan-2-yl}carbamate trifluoroacetate (Example 216A, 0.30 mmol, 1 equivalent) were reacted and worked up analogously to Example 126. This gave 66 mg (50% of theory; 95%) of the title compound.
LC-MS (Method 2): Rt=0.60 min
MS (ESpos): m/z=443.3 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.80 (br. s, 2H), 2.15-2.37 (m, 1H), 2.40-2.47 (m, 1H), 3.15-3.28 (m, 2H), 5.30 (s, 2H), 6.94 (t, 1H), 7.01 (d, 1H), 7.24 (t, 2H), 7.55-7.64 (m, 1H), 7.89 (t, 1H), 8.64 (d, 1H), [further signals hidden under solvent peaks].
Example 128
ent-N-(2-Amino-4,4,4-trifluorobutyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer A) 




85 mg of ent-benzyl {1-[({8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridin-3-yl}-carbonyl)amino]-4,4,4-trifluorobutan-2-yl}carbamate (Example 217A, 0.14 mmol, 1 equivalent) were initially charged in 2.1 ml of a 1:1:0.1 mixture of ethanol/dichloromethane/methanol and, with addition of 0.3 ml of cyclohexene (2.88 mmol, 20 equivalents) and 15 mg of 10% palladium on activated carbon (0.014 mmol, 0.1 equivalent), stirred at reflux for 3 h. Another 0.15 ml of cyclohexene (1.44 mmol, 10 equivalents) and 15 mg of 10% palladium on activated carbon (0.014 mmol, 0.1 equivalent) were then added, and the mixture was stirred at reflux for a further 6 h. The reaction solution was filtered through a Millipore® filter, washed thoroughly with methanol and concentrated. The residue was purified by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). The crude product was taken up in dichloromethane and washed twice with saturated aqueous sodium bicarbonate solution. The aqueous phase was extracted twice with dichloromethane and the combined organic phases were dried over sodium sulphate, filtered and concentrated. This gave 52 mg (75% of theory, purity 95%) of the title compound.
LC-MS (Method 2): Rt=0.69 min
MS (ESpos): m/z=457.3 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.69 (br. s, 2H), 2.16-2.30 (m, 1H), 2.31 (s, 3H), 2.36-2.46 (m, 1H), 3.13-3.27 (m, 2H), 5.27 (s, 2H), 6.92 (s, 1H), 7.23 (t, 2H), 7.54-7.65 (m, 1H), 7.81-7.88 (m, 1H), 8.47 (s, 1H), [further signals hidden under solvent peaks].
Specific rotation [α](365 nm, 19.6° C.)=+42.5° (c=0.00445 g/ml, acetonitrile)
Example 129
ent-N-(2-Amino-4,4,4-trifluorobutyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer B)




92 mg of ent-benzyl {1-[({8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]-4,4,4-trifluorobutan-2-yl}carbamate (Example 218A, 0.16 mmol, 1 equivalent) were initially charged in 2.1 ml of a 1:1:0.1 mixture of ethanol/dichloromethane/methanol and, with addition of 0.47 ml of cyclohexene (4.67 mmol, 30 equivalents) and 33 mg of 10% palladium on activated carbon (0.03 mmol, 0.1 equivalent), stirred at reflux for 6 h. The reaction solution was filtered through a Millipore® filter, washed thoroughly with methanol and concentrated. The residue was purified by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). The crude product was taken up in dichloromethane and washed twice with saturated aqueous sodium bicarbonate solution. The aqueous phase was extracted twice with dichloromethane. The combined organic phases were dried over sodium sulphate, filtered and concentrated. This gave 46 mg (64% of theory) of the title compound.
LC-MS (Method 2): Rt=0.70 min
MS (ESpos): m/z=457.3 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.71 (br. s, 2H), 2.16-2.30 (m, 1H), 2.31 (s, 3H), 2.36-2.46 (m, 1H), 3.13-3.27 (m, 2H), 5.28 (s, 2H), 6.92 (s, 1H), 7.23 (t, 2H), 7.54-7.65 (m, 1H), 7.81-7.88 (m, 1H), 8.47 (s, 1H), [further signals hidden under solvent peaks].
Specific rotation [α](365 nm, 19.5° C.)=−39.0° (c=0.005 g/ml, acetonitrile)
The examples shown in Table 11 were prepared analogously to Example 75 by reacting the appropriate carboxylic acid with the appropriate commercially available amines under the reaction conditions described in the Representative Working Procedure 2.









TABLE 11





Exam-
IUPAC name/structure



ple
(yield)
Analytical data







130
8-[(2,6-difluorobenzyl)oxy]-N-[2- (isopropylamino)ethyl]-2-methylimidazo[1,2-a]- pyridine-3-carboxamide   


   (56% of theory; purity 96%)
LC-MS (Method 7): Rt = 0.53 min MS (ESpos): m/z = 403.2 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 0.98 (d, 6 H), 2.66-2.80 (m, 3 H), 5.30 (s, 2 H), 6.92 (t, 1 H), 7.02 (d, 1 H), 7.23 (t, 2 H), 7.54-7.64 (m, 1 H), 7.79 (t, 1 H), 8.64 (d, 1 H), [further signals hidden under solvent peaks].


 


131
8-[(2,6-difluorobenzyl)oxy]-N-[2-(1,1- dioxidothiomorpholin-4-yl)ethyl]-2- methylimidazo[1,2-a]pyridine-3-carboxamide   


   (84% of theory; purity 99%)
LC-MS (Method 7): Rt = 0.65 min MS (ESpos): m/z = 479.1 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 2.53 (s, 3 H), 2.69 (t, 2 H), 2.94- 3.00 (m, 4 H), 3.06-3.12 (m, 4 H), 3.39-3.46 (m, 2 H), 5.30 (s, 2 H), 6.93 (t, 1 H), 7.02 (d, 1 H), 7.23 (d, 2 H), 7.54-7.64 (m, 1 H), 7.74 (t, 1 H), 8.64 (d, 1 H).


 


132
rac-8-[(2,6-difluorobenzyl)oxy]-2-methyl-N-[2- (morpholin-4-yl)propyl]imidazo[1,2-a]pyridine-  3-carboxamide   


   (85% of theory; purity 100%)
LC-MS (Method 7): Rt = 0.53 min MS (ESpos): m/z = 445.2 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 0.96 (d, 2 H), 2.37-2.45 (m, 2 H), 2.58 (m, 5 H, obscured by DMSO signal), 2.74-2.84 (m, 1 H), 3.52- 3.63 (m, 4 H), 5.30 (s, 2 H), 6.94 (t, 1 H), 7.02 (d, 1 H), 7.23 (t, 2 H), 7.54- 7.65 (m, 2 H), 8.71 (d, 1 H), [further signals hidden under solvent peaks].


 


133
8-[(2,6-difluorobenzyl)oxy]-2-methyl-N-[2-(4-  methylpiperazin-1-yl)ethyl]imidazo[1,2-a]- pyridine-3-carboxamide   


   (59% of theory; purity 98%)
LC-MS (Method 2): Rt = 0.54 min MS (ESpos): m/z = 444.2 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 2.15 (s, 3 H), 2.24-2.52 (m, 13 H; superimposed by DMSO signal), 3.37-3.46 (m, 2 H), 5.29 (s, 2 H), 6.92 (t, 1 H), 7.02 (d, 1 H), 7.24 (t, 2 H), 7.53-7.64 (m, 1 H), 7.69 (t, 1 H), 8.66 (d, 1 H).


 


134
rac-8-[(2,6-difluorobenzyl)oxy]-2-methyl-N-[2- (morpholin-4-yl)-1-phenylethyl]imidazo[1,2-a]- pyridine-3-carboxamide   


   (71% of theory; purity 95%)
LC-MS (Method 7): Rt = 0.72 min MS (ESpos): m/z = 507.2 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 2.34-2.44 (m, 2 H), 2.61 (s, 3 H), 2.75-2.84 (m, 1 H), 3.51-3.63 (m, 4 H), 5.13-5.24 (m, 1 H), 5.31 (s, 2 H), 6.91 (t, 1 H), 7.00 (d, 1 H), 7.19-7.29 (m, 3 H), 7.35 (t, 2 H), 7.44 (d, 2 H), 7.53-7.66 (m, 2 H), 8.27 (d, 1 H), 8.52 (d, 1 H), [further signals hidden under solvent peaks].


 


135
rac-8-[(2,6-difluorobenzyl)oxy]-N-[2- (isopropylamino)ethyl]-2,6- dimethylimidazo[1,2-a]pyridine-3-carboxamide   


   (74% of theory; purity: 100%)
LC-MS (Method 7): Rt = 0.59 min MS (ESpos): m/z = 417.2 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 0.98 (d, 6 H), 1.68 (br. s, 1 H), 2.30 (s, 3 H), 2.66-2.80 (m, 3 H), 5.30 (s, 2 H), 6.91 (s, 1 H), 7.23 (t, 2 H), 7.54-7.64 (m, 1 H), 7.78 (t, 1 H), 8.48 (s, 1 H), [further signals hidden under solvent peaks].


 


136
8-[(2,6-difluorobenzyl)oxy]-2,6-dimethyl-N-[2- (morpholin-4-yl)ethyl]imidazo[1,2-a]pyridine-3-  carboxamide   


   (59% of theory; purity 97%)
LC-MS (Method 7): Rt = 0.63 min MS (ESpos): m/z = 445.2 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 2.30 (s, 3 H), 2.39-2.45 (m, 4 H), 3.39-3.46 (m, 2 H), 3.57 (br. s, 4 H), 5.28 (s, 2 H), 6.93 (s, 1 H), 7.22 (t, 2 H), 7.52-7.64 (m, 1 H), 7.70 (br. s, 1 H), 8.48 (br. s, 1 H), [further signals hidden under solvent peaks].


 


137
8-[(2,6-difluorobenzyl)oxy]-2,6-dimethyl-N-[2- (4-methylpiperazin-1-yl)ethyl]imidazo[1,2-a]- pyridine-3-carboxamide   


   (71% of theory; purity 97%)
LC-MS (Method 2): Rt = 0.57 min MS (ESpos): m/z = 458.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 2.31 (s, 3 H), 3.38-3.47 (m, 2 H), 5.28 (s, 2 H), 6.92 (s, 1 H), 7.25 (t, 3 H), 7.53-7.64 (m, 1 H), 7.68 (br. s, 1 H), 8.48 (s, 1 H), [further signals hidden under solvent peaks].


 


138
rac-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethyl-N- [2-(morpholin-4-yl)propyl]imidazo[1,2-a]- pyridine-3-carboxamide   


   (59% of theory; purity 98%)
LC-MS (Method 7): Rt = 0.59 min MS (ESpos): m/z = 459.2 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 0.97(d, 3H), 2.31 (s, 3H), 2.38- 2.46 (m, 2 H), 2.73-2.83 (m, 1 H), 3.50-3.64 (m, 4 H), 5.29 (s, 2 H), 6.93 (s, 1 H), 7.23 (t, 2 H), 7.54-7.66 (m, 2 H), 8.52 (s, 1 H), [further signal hidden under solvent peak].


 


139
8-[(2,6-difluorobenzyl)oxy]-N-[2-(4- isopropylpiperazin-1-yl)ethyl]-2,6- dimethylimidazo[1,2-a]pyridine-3-carboxamide   


   (72% of theory; purity 98%)
LC-MS (Method 2): Rt = 0.63 min MS (ESpos): m/z = 486.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 0.95(d, 6H), 2.31(s, 3H), 2.38- 2.45 (m, 6 H), 3.36-3.45 (m, 2 H), 5.28 (s, 2 H), 6.91 (s, 1 H), 7.24 (t, 2 H), 7.52-7.64 (m, 1 H), 7.67 (t, 1 H), 8.48 (s, 1 H), [further signals hidden under solvent peak].









Example 140
N-(2-Amino-2-methylpropyl)-8-[(2,6-difluorobenzyl)oxy]-6-fluoro-2-methylimidazo[1,2-a]-pyridine-3-carboxamide 




45 mg of 8-[(2,6-difluorobenzyl)oxy]-6-fluoro-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid Example 11A, 0.13 mmol, 1 equivalent), 65 mg of (benzotriazol-1-yloxy)bisdimethylaminomethylium fluoroborate (TBTU, 0.2 mmol, 1.5 equivalents) and 54 mg of 4-methylmorpholine (0.54 mmol, 4 equivalents) were initially charged in 0.9 ml of DMF. After 10 min at RT, 24 mg of 1,2-diamino-2-methylpropane (0.27 mmol, 2 equivalents) were added and the mixture was stirred at RT overnight. Another 22 mg equivalents of TBTU (0.07 mmol, 0.5 equivalents) and 12 mg of 1,2-diamino-2-methylpropane (0.13 mmol, 1 equivalent) were added and the reaction was stirred at RT for 2 h. Water was added and the reaction solution was purified by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). The residue was taken up in dichloromethane and washed twice with saturated aqueous sodium bicarbonate solution. The aqueous phase was extracted twice with dichloromethane and the combined organic phases were dried over sodium sulphate. The mixture was filtered and concentrated and the crude product obtained was purified by thick-layer chromatography (mobile phase: dichloromethane/2 N ammonia in methanol: 10:0.5). This gave 31 mg of the title compound (55% of theory; purity 98%).
LC-MS (Method 2): Rt=0.64 min
MS (ESpos): m/z=407.2 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.05 (s, 6H), 1.52 (br. s, 2H), 3.15-3.23 (m, 2H), 5.32 (s, 2H), 7.19-7.32 (m, 3H), 7.55-7.66 (m, 1H), 7.75 (br. s, 1H), 8.69-8.76 (m, 1H), [further signal hidden under solvent peaks].
Example 141
N-(3-Amino-2,3-dimethylbutan-2-yl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide 




75 mg of 8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid (Example 3A, 0.24 mmol, 1 equivalent), 116 mg of O-(7-azabenzotriazol-1-yl)-N,N,N′N′-tetramethyluronium hexafluorophosphate (HATU, 0.31 mmol, 1.3 equivalents) and 152 mg of N,N-diisopropylethylamine (0.21 ml, 1.18 mmol, 5 equivalents) were dissolved in 1.6 ml of DMF, after 10 min at RT, 111 mg of 2,3-dimethylbutane-2,3-diamine dihydrochloride (0.6 mmol, 2.5 equivalents) were added and the mixture was stirred at RT overnight. The product was then purified by preparative HPLC (method: RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). The product fraction obtained was dissolved in ethyl acetate and saturated aqueous sodium bicarbonate solution and the aqueous phase was extracted twice with ethyl acetate. The combined organic phases were dried over sodium sulphate, filtered, concentrated and lyophilized. This gave 20 mg (20% of theory; purity 99%) of the title compound.
LC-MS (Method 7): Rt=0.57 min
MS (ESpos): m/z=417.2 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.13 (s, 6H), 1.42 (s, 6H), 2.58 (s, 3H), 5.30 (s, 2H), 6.93 (t, 1H), 7.02 (d, 1H), 7.23 (t, 2H), 7.53-7.65 (m, 1H), 7.92 (s, 1H), 8.89 (d, 1H).
The examples shown in Table 12 were prepared analogously to Example 141 by reacting the appropriate carboxylic acids (Example 3A, 16A and 21A) with the appropriate amines, prepared as described above or commercially available (1.05-2.5 equivalents), and N,N-diisopropylethylamine (3-6 equivalents) under the reaction conditions described in the General Working Procedure 3.
Exemplary work-up of the reaction mixture: Water was added to the reaction solution and the precipitate formed was stirred for another 0.5-1.0 h, filtered off, washed with water and dried under high vacuum overnight. Alternatively, the precipitate or the crude reaction mixture was purified further directly by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA) and dried under high vacuum overnight. If appropriate, the product fractions were taken up in ethyl acetate or dichloromethane and washed twice with saturated aqueous sodium bicarbonate solution. The aqueous phase was extracted twice with ethyl acetate or dichloromethane and the combined organic phases were dried over sodium sulphate, filtered and concentrated.









TABLE 12





Exam-
IUPAC name/structure



ple
(yield)
Analytical data







142
rac-8-[(2,6-difluorobenzyl)oxy]-N-[2-(dimethyl- amino)-3-methylbutyl]-2-methylimidazo[1,2-a]- pyridine-3-carboxamide   


   (84% of theory; purity 96%)
LC-MS (Method 2): Rt = 0.61 min MS (ESpos): m/z = 431.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 0.95 (dd, 6 H), 1.79-1.89 (m, 1 H), 2.31-2.41 (m, 7 H), 3.25-3.32 (m, 1 H), 3.39-3.48 (m, 1 H), 5.30 (s, 2 H), 6.93 (t, 1 H), 7.01 (d, 1 H), 7.24 (t, 2 H), 7.54-7.67 (m, 2 H), 8.71 (d, 1 H), [further signal hidden under solvent peaks].


 


143
8-[(2,6-difluorobenzyl)oxy]-N-[2-(3,3- difluoropyrrolidin-1-yl)ethyl]-2- methylimidazo[1,2-a]pyridine-3-carboxamide   


   (90% of theory; purity 99%)
LC-MS (Method 2): Rt = 0.65 min MS (ESpos): m/z = 451.2 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 2.16-2.31 (m, 2 H), 2.64 (t, 2 H), 2.77 (t, 2 H), 2.96 (t, 2 H), 3.38-3.46 (m, 2 H), 5.30 (s, 2 H), 6.93 (t, 1 H), 7.01 (d, 1 H), 7.24 (t, 2 H), 7.54-7.64 (m, 1 H), 7.82 (t, 1 H), 8.63 (d, 1 H), [further signal hidden under solvent peaks].


 


144
8-[(2,6-difluorobenzyl)oxy]-N-{2-[(2- methoxyethyl)amino]ethyl}-2- methylimidazo[1,2-a]pyridine-3-carboxamide   


   (60% of theory; purity 99%)
LC-MS (Method 2): Rt = 0.56 min MS (ESpos): m/z = 419.2 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.82 (br. s, 1 H), 2.65-2.75 (m, 4 H), 3.23 (s, 3 H), 3.38 (m, 4 H), 5.28 (s, 2 H), 6.93 (t, 1 H), 7.01 (d, 1 H), 7.24 (t, 2 H), 7.54-7.64 (m, 1 H), 7.80 (t, 1 H), 8.63 (d, 1 H), [further signal hidden under solvent peaks].


 


145
8-[(2,6-difluorobenzyl)oxy]-N-[2- (dimethylamino)-2-methylpropyl]-2- methylimidazo[1,2-a]pyridine-3-carboxamide   


   (90% of theory; purity 99%)
LC-MS (Method 2): Rt = 0.56 min MS (ESpos): m/z = 417.2 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.01 (s, 6 H), 2.20 (s, 6 H), 2.56 (s, 3 H), 3.29-3.32 (m, 2 H; superimposed by solvent signal), 5.31 (s, 2 H), 6.94 (t, 1 H), 7.02 (d, 1 H), 7.24 (t, 2 H), 7.37 (t, 1 H), 7.54-7.65 (m, 1 H), 8.76 (d, 1 H).


 


146
N-{2-[cyclopropyl(2,2- difluoroethyl)amino]ethyl]}-8-[(2,6- difluorobenzyl)oxy]-2-methylimidazo[1,2-a]- pyridine-3-carboxamide   


   (77% of theory; purity: 97%)
LC-MS (Method 2): Rt = 0.97 min MS (ESpos): m/z = 465.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 0.35-0.42 (m, 2 H), 0.45-0.51 (m, 2 H), 2.05-2.14 (m, 1 H), 2.89 (t, 2 H), 3.03 (td, 2 H), 3.44 (dd, 2 H), 5.30 (s, 2 H), 6.13 (tt, 1 H), 6.92 (t, 1 H), 7.01 (d, 1 H), 7.24 (t, 2 H), 7.54- 7.64 (m, 1 H), 7.67 (t, 1 H), 8.67 (d, 1 H), [further signal hidden under solvent peaks].


 


147
rac-N-(2-amino-4,4,4-trifluorobutyl)-6-chloro-8- [(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2- a]pyridine-3-carboxamide   


   (63% of theory; purity 99%)
LC-MS (Method 7): Rt = 0.75 min MS (ESpos): m/z = 477.0 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.72 (br. s, 2 H), 2.18-2.32 (m, 1 H), 2.34-2.49 (m, 1 H), 3.16-3.28 (m, 2 H), 3.32-3.41 (m, 1 H), 5.32 (s, 2 H), 7.18-7.28 (m, 3 H), 7.55-7.65 (m, 1 H), 7.93 (t, 1 H), 8.64 (d, 1 H), [further signal hidden under solvent peaks].


 


148
6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methyl- N-[2-methyl-2-(pyrrolidin-1-yl)- propyl]imidazo[1,2-a]pyridine-3-carboxamide   


   (64% of theory; purity: 98%)
LC-MS (Method 7): Rt = 0.76 min MS (ESpos): m/z = 477.1 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.04 (s, 6 H), 1.63-1.72 (m, 4 H), 2.57-2.63 (m, 4 H), 3.28-3.31 (m, 2 H), 5.34 (s, 2 H), 7.18-7.29 (m, 3 H), 7.45-7.53 (m, 1 H), 7.56-7.66 (m, 1 H), 8.89 (d, 1 H), [further signal hidden under DMSO peak].


 


149
6-chloro-8-[(2,6-difluorobenzyl)oxy]-N-[2- (isopropylamino)ethyl]-2-methylimidazo[1,2-a]-  pyridine-3-carboxamide   


   (87% of theory; purity 100%)
LC-MS (Method 2): Rt = 0.73 min MS (ESpos): m/z = 437.2 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 0.98 (d, 6 H), 1.63 (br. s, 1 H), 2.66-2.79 (m, 3 H), 3.32-3.39 (m, 2 H, superimposed by solvent signal), 5.34 (s, 2 H), 7.19 (d, 1 H), 7.22-7.29 (m, 2 H), 7.56-7.65 (m, 1 H), 7.84- 7.90 (m, 1 H), 8.77 (d, 1 H), [further signal hidden under DMSO peak].


 


150
6-chloro-N-{2-[cyclopropyl(2,2-difluoroethyl)- amino]ethyl]}-8-[(2,6-difluorobenzyl)oxy]-2- methylimidazo[1,2-a]pyridine-3-carboxamide   


   (78% of theory; purity: 98%)
LC-MS (Method 2): Rt = 1.22 min MS (ESpos): m/z = 499.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 0.35-0.41 (m, 2 H), 0.46-0.52 (m, 2 H), 2.06-2.14 (m, 1 H), 2.48 (s, 3 H), 2.89 (t, 2 H), 3.02 (td, 2 H), 3.41-  3.50 (m, 2 H), 5.34 (s, 2 H), 6.14 (tt, 1 H), 7.20 (d, 1 H), 7.26 (t, 2 H), 7.56- 7.65 (m, 1 H), 7.74 (t, 1 H), 8.76 (d, 1 H).


 


151
6-chloro-8-[(2,6-difluorobenzyl)oxy]-N-[2-(4,4- difluoropiperidin-1-yl)ethyl]-2- methylimidazo[1,2-a]pyridine-3-carboxamide   


   (54% of theory; purity: 97%)
LC-MS (Method 2): Rt = 0.79 min MS (ESpos): m/z = 499.2 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.88-2.03 (m, 4 H), 3.39-3.47 (m, 2 H), 5.34 (s, 2 H), 7.19 (d, 1 H), 7.25 (t, 2 H), 7.55-7.65 (m, 1 H), 7.85 (t, 1 H), 8.76 (d, 1 H), [further signals hidden under solvent peaks].


 


152
6-chloro-8-[(2,6-difluorobenzyl)oxy]-N-[2-(4- isopropylpiperazin-1-yl)ethyl]-2-methyl- imidazo[1,2-a]pyridine-3-carboxamide   


   (88% of theory; purity 100%)
LC-MS (Method 2): Rt = 0.77 min MS (ESpos): m/z = 506.4 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 0.94 (d, 6 H), 2.42 (br. s, 6 H), 3.37-3.46 (m, 2 H), 5.34 (s, 2 H), 7.18 (d, 1 H), 7.25 (t, 2 H), 7.55-7.66 (m, 1 H), 7.80 (t, 1 H), 8.75 (d, 1 H), [further signals hidden under solvent peaks].


 


153
6-chloro-8-[(2,6-difluorobenzyl)oxy]-N-{2-[(2- methoxyethyl)amino]ethyl}-2- methylimidazo[1,2-a]pyridine-3-carboxamide   


   (39% of theory; purity 97%)
LC-MS (Method 2): Rt = 0.72 min MS (ESpos): m/z = 453.2 (M + H)+ 1H NMR (500 MHz, DMSO-d6): δ = 2.66-2.76 (m, 4 H), 3.23 (s, 3 H), 3.36-3.41 (m, 4 H), 5.34 (s, 2 H), 7.19 (s, 1 H), 7.25 (t, 2 H), 7.56-7.66 (m, 1 H), 7.87 (t, 1 H), 8.76 (s, 1 H), [further signals hidden under solvent peaks].


 


154
6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methyl- N-[2-(4-methylpiperazin-1-yl)ethyl]imidazo[1,2- a]pyridine-3-carboxamide   


   (81% of theory; purity 100%)
LC-MS (Method 2): Rt = 0.75 min MS (ESpos): m/z = 478.4 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 2.14 (s, 3 H), 2.24-2.52 (m, 10 H, superimposed by solvent signal), 3.38- 3.45 (m, 2 H), 5.34 (s, 2 H), 7.19 (d, 1 H), 7.26 (t, 2 H), 7.55-7.66 (m, 1 H), 7.79 (t, 1 H), 8.77 (d, 1 H), [further signals hidden under solvent peaks].


 


155
N-[(1-aminocyclobutyl)methyl]-6-chloro-8-[(2,6- difluorobenzyl)oxy]-2-methylimidazo[1,2-a]- pyridine-3-carboxamide trifluoroacetate   


   (27% of theory; purity 95%)
LC-MS (Method 2): Rt = 0.77 min MS (ESpos): m/z = 435.3 (M − TFA + H)+ 1H NMR (500 MHz, DMSO-d6): δ = 1.79-1.97 (m, 2 H), 2.12-2.25 (m, 4 H), 2.56 (s, 3 H), 3.66 (d, 2 H), 5.36 (s, 2 H), 7.20-7.28 (m, 3 H), 7.57-7.65 (m, 1 H), 7.98-8.06 (m, 3 H), 8.21 (t, 1 H), 8.76 (s, 1 H).


 


156
6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methyl- N-{2-[3-(pyrrolidin-l-yl)azetidin-1-yl]ethyl}- imidazo[1,2-a]pyridine-3-carboxamide   


   (35% of theory; purity 98%)
LC-MS (Method 7): Rt = 0.62 min MS (ESpos): m/z = 504.2 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.63-1.69 (m, 4 H), 2.32-2.36 (m, 4 H), 2.87-2.94 (m, 2 H), 2.97- 3.05 (m, 1 H), 3.22-3.28 (m, 2 H), 3.40 (t, 2 H), 5.34 (s, 2 H), 7.19 (d, 1 H), 7.25 (t, 2 H), 7.56-7.65 (m, 1 H), 7.84 (t, 1 H), 8.77 (d, 1 H), [further signals hidden under the solvent peaks].


 


157
rac-N-(2-amino-2-methylbutyl)-6-chloro-8-[(2,6- difluorobenzyl)oxy]-2-methylimidazo[1,2-a]- pyridine-3-carboxamide   


   (89% of theory; purity 99%)
LC-MS (Method 7): Rt = 0.69 min MS (ESpos): m/z = 437.1 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 0.86 (t, 3 H), 0.97 (s, 3 H), 1.30- 1.38 (m, 2 H), 1.43 (br. s, 1 H), 3.15- 3.27 (m, 2 H), 5.34 (s, 2 H), 7.19 (d, 1 H), 7.25 (t, 2 H), 7.55-7.65 (m, 1 H), 7.66-7.77 (m, 1 H), 8.77 (d, 1 H), [further signal hidden under the solvent peaks].


 


158
6-chloro-8-[(2,6-difluorobenzyl)oxy]-N-{2- [(2R,6S)-2,6-dimethylmorpholin-4-yl]ethyl}-2- methylimidazo[1,2-a]pyridine-3-carboxamide   


   (92% of theory; purity 99%)
LC-MS (Method 2): Rt = 0.82 min MS (ESpos): m/z = 493.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.05 (d, 6 H), 1.67 (t, 2 H), 2.81 (d, 2 H), 3.38-3.46 (m, 2 H), 3.50- 3.60 (m, 2 H), 5.34 (s, 2 H), 7.20 (d, 1 H), 7.25 (t, 2 H), 7.56-7.66 (m, 1 H), signals hidden under the solvent peaks].


 


159
rac-N-(2-amino-3-methoxy-2-methylpropyl)-6- chloro-8-[(2,6-difluorobenzyl)oxy]-2- methylimidazo[1,2-a]pyridine-3-carboxamide   


   (88% of theory; purity 100%)
LC-MS (Method 2): Rt = 0.73 min MS (ESpos): m/z = 453.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.00 (s, 3 H), 1.72 (br. s, 2 H), 3.12- 3.20 (m, 2 H), 3.22-3.31 (m, 5 H, superimposed by solvent signal), 5.34 (s, 2 H), 7.20 (d, 1 H), 7.25 (t, 2 H), 7.56-7.71 (m, 2 H), 8.81 (d, 1 H), [further signal hidden under the solvent peaks].


 


160
N-(3-aminocyclohexyl)-8-[(2,6- difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-  pyridine-3-carboxamide (mixture of stereoisomers)   


   (58% of theory; purity 98%) 
LC-MS (Method 2): Rt = 0.60 min MS (ESpos): m/z = 429.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 0.89-1.39 (m, 4 H), 1.42-1.99 (m, 6 H), 2.30 (s, 3 H), 2.47 (s, 3 H), 2.62-2.72 and 3.06-3.11 (m, together 1 H), 3.73-3.89 and 4.21- 4.28 (m, together 1 H), 5.28 (s, 2 H), 6.89 (s, 1 H), 7.23 (t, 2H), 7.54-7.63 (m, 1 H), 7.79 and 7.92 (2 × d, together 1 H), 8.85 and 8.89 (2 × s, together 1 H).


 


161
rac-N-(2-amino-2-methylbutyl)-8-[(2,6- difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]- pyridine-3-carboxamide   


   (83% of theory; purity 99%)
LC-MS (Method 7): Rt = 0.56 min MS (ESpos): m/z = 417.2 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 0.86 (t, 3 H), 0.97 (s, 3 H), 1.30- 1.40 (m, 2 H), 1.45 (br. s, 2 H), 2.31 (s, 3 H), 2.53 (s, 3 H, superimposed by solvent peaks), 3.14-3.26 (m, 2 H), 5.29 (s, 2 H), 6.91 (s, 1 H), 7.20-7.28 (m, 2 H), 7.54-7.65 (m, 2 H), 8.49 (s, 1 H).


 


162
8-[(2,6-difluorobenzyl)oxy]-2,6-dimethyl-N-{2- [3-(pyrrolidin-1-yl)azetidin-1- yl]ethyl}imidazo[1,2-a]pyridine-3-carboxamide   


   (56% of theory; purity 97%)
LC-MS (Method 2): Rt = 0.58 min MS (ESpos): m/z = 484.4 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.64-1.69 (m, 4 H), 2.31 (s, 3 H), 2.32-2.39 (m, 4 H), 2.47 (s, 3 H), 2.56-2.62 (m, 2 H, superimposed by solvent peaks), 2.88-2.97 (m, 2 H), 2.98-3.07 (m, 1 H), 3.21-3.28 (m, 2 H), 3.38-3.45 (m, 2 H), 5.28 (s, 2 H), 6.91 (s, 1 H), 7.24 (t, 2 H), 7.54-7.64 (m, 1 H), 7.71 (t, 1 H), 8.47 (s, 1 H).


 


163
8-[(2,6-difluorobenzyl)oxy]-N-[2-(4,4-difluoro-  piperidin-1-yl)ethyl]-2,6-dimethylimidazo[1,2- a]pyridine-3-carboxamide   


   (56% of theory; purity 98%)
LC-MS (Method 2): Rt = 0.66 min MS (ESpos): m/z = 479.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.88-2.02 (m, 4 H), 2.31 (s, 3 H), 2.56-2.60 (m, 4 H), 3.38-3.46 (m, 2 H), 5.27 (s, 2 H), 6.92 (s, 1 H), 7.24 (t, 2 H), 7.55-7.64 (m, 1 H), 7.71 (t, 1 H), 8.47 (s, 1 H), [further signals hidden under solvent peaks].


 


164
N-{2-[cyclopropyl(2,2- difluoroethyl)amino]ethyl}-8-[(2,6- difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]- pyridine-3-carboxamide   


   (71% of theory; purity 100%)
LC-MS (Method 2): Rt = 0.99 min MS (ESpos): m/z = 479.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 0.35-0.42 (m, 2 H), 0.45-0.53 (m, 2 H), 2.06-2.13 (m, 1 H), 2.30 (s, 3 H), 2.46 (s, 3 H), 2.89 (t, 2 H), 3.03 (td, 2 H), 3.39-3.48 (m, 2 H), 5.27 (s, 2 H), 6.14 (tt, 1 H), 6.91 (s, 1 H), 7.24 (t, 2 H), 7.54-7.66 (m, 2 H), 8.48 (s, 1 H).


 


165
N-[(1-aminocyclobutyl)methyl]-8-[(2,6- difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-  pyridine-3-carboxamide 1)   


   (22% of theory; purity 97%)
LC-MS (Method 2): Rt = 0.63 min MS (ESpos): m/z = 415.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.56-1.83 (m, 4 H), 1.92-2.03 (m, 2 H), 2.31 (s, 3 H), 3.39 (d, 2 H), 5.28 (s, 2 H), 6.92 (s, 1 H), 7.24 (t, 2 H), 7.53-7.65 (m, 2 H), 8.49 (s, 1 H), [further signal hidden under solvent peaks].


 


166
rac-N-(2-amino-3-methoxy-2-methylpropyl)-8- [(2,6-difluorobenzyl)oxy]-2,6- dimethylimidazo[1,2-a]pyridine-3-carboxamide   


   (80% of theory; purity 100%)
LC-MS (Method 2): Rt = 0.62 min MS (ESpos): m/z = 433.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.00 (s, 3 H), 1.52-1.62 (br. s, 2 H), 2.31 (s, 3 H), 2.53 (s, 3 H), 3.123- 3.19 (m, 2 H), 3.24-3.30 (m, 5 H), 5.28 (s, 2 H), 6.92 (s, 1 H), 7.24 (t, 2 H), 7.51-7.64 (m, 2 H), 8.52 (s, 1 H).


 


167
8-[(2,6-difluorobenzyl)oxy]-N-{2-[(2R,6S)-2,6-  dimethylmorpholin-4-yl]ethyl}-2,6-dimethyl- imidazo[1,2-a]pyridine-3-carboxamide   


   (76% of theory; purity 100%)
LC-MS (Method 2): Rt = 0.71 min MS (ESpos): m/z = 473.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.05 (d, 6 H), 1.67 (t, 2 H), 2.31 (s, 3 H), 2.80 (d, 2 H), 3.38-3.45 (m, 2 H), 3.49-3.60 (m, 2 H), 5.28 (s, 2 H), 6.91 (s, 1 H), 7.24 (t, 2 H), 7.54- 7.64 (m, 1 H), 7.68 (t, 1 H), 8.48 (s, 1 H), [further signals hidden under solvent peaks].





1) There was an additional chromatographic separation: column: Sunfire C18, 5 μm, 250 × 20 mm, mobile phase: 89% methanol, 11% 1% strength TFA in water, flow rate: 25 ml/min; 25° C., detection: 210 nm].






Example 168
N-[2-(4-Cyclopropylpiperazin-1-yl)ethyl]-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide 




118 mg of 8-[(2,6-difluorobenzyl)oxy]-2-methyl-N-(2-oxoethyl)imidazo[1,2-a]pyridine-3-carboxamide (Example 194A, 0.16 mmol, 1 equivalent) were suspended in 0.8 ml of dry dichloroethane, 23 mg 1-cyclopropylpiperazine (0.18 mmol, 1.1 equivalents) were added and the mixture was stirred at RT for 3 h. 52 mg of sodium triacetoxyborohydride (0.25 mmol, 1.5 equivalents) were then added, and the mixture was stirred at RT overnight. 1 N aqueous sodium hydroxide solution was then added, and the mixture was extracted three times with dichloromethane. The combined organic phases were washed with water and saturated aqueous sodium chloride solution, dried over sodium sulphate, filtered and concentrated. The residue was dissolved in methanol and purified by preparative HPLC (method: RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). The product fraction was taken up in ethyl acetate and washed twice with saturated aqueous sodium bicarbonate solution. The combined organic phases were dried over sodium sulphate, filtered and concentrated. This gave 33.5 mg (43% of theory) of the title compound.
LC-MS (Method 7): Rt=0.60 min
MS (ESpos): m/z=470.2 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.22-0.30 (m, 2H), 0.34-0.43 (m, 2H), 1.53-1.62 (m, 1H), 2.30-2.44 (m, 3H), 3.37-3.46 (m, 2H), 5.30 (s, 2H), 6.93 (t, 1H), 7.01 (d, 1H), 7.23 (t, 2H), 7.55-7.64 (m, 1H), 7.70 (t, 1H), 8.67 (d, 1H), [further signals hidden under solvent peaks].
The examples shown in Table 13 were prepared analogously to Example 168 from the aldehydes of Examples 194A, 195A and 196A.









TABLE 13





Exam-
IUPAC name/structure 



ple
(yield)
Analytical data







169 
8-[(2,6-difluorobenzyl)oxy]-N-{2-[(2,2- difluoroethyl)amino]ethyl}-2- methylimidazo[1,2-a]pyridine-3-carboxamide   


   (51% of theory; purity 93%)
LC-MS (Method 7): Rt = 0.57 min MS (ESpos): m/z = 425.1 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 2.78 (t, 2 H), 2.93 (dt, 2 H), 3.34- 3.42 (m, 2 H), 5.30 (s, 2 H), 6.01 (tt, 1 H), 6.93 (t, 1 H), 7.01 (d, 1 H), 7.23 (t, 2 H), 7.55-7.64 (m, 1 H), 7.79 (t, 1 H), 8.64 (d, 1 H), [further signal hidden under solvent peaks].


 


170
8-[(2,6-difluorobenzyl)oxy]-2-methyl-N-[(2R)-1- (morpholin-4-yl)propan-2-yl]imidazo[1,2-a]- pyridine-3-carboxamide 1)   


   (39% of theory; purity 100%)
LC-MS (Method 1): Rt = 0.60 min MS (ESpos): m/z = 445.2 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.17 (d, 3 H), 2.17-2.43 (m, 3 H), 3.46-3.62 (m, 4 H), 4.15-4.28 (m, 1 H), 5.29 (s, 2 H), 6.91 (t, 1 H), 6.99 (d, 1 H), 7.18-7.28 (m, 2 H), 7.53-7.63 (m, 1 H), 7.68 (d, 1 H), 8.56 (d, 1 H), [further signals hidden under solvent peaks].


 


171
8-[(2,6-difluorobenzyl)oxy]-2-methyl-N-[(2S)-1-  (morpholin-4-yl)propan-2-yl]imidazo[1,2-a]- pyridine-3-carboxamide 1)   


   (95% of theory; purity 100%)
LC-MS (Method 7): Rt = 0.59 min MS (ESpos): m/z = 445.2 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ = 1.17 (d, 3 H), 2.15-2.43 (m, 3 H), 3.47-3.62 (m, 4 H), 4.15-4.28 (m, 1 H), 5.30 (s, 2 H), 6.92 (t, 1 H), 6.99 (d, 1 H), 7.18-7.28 (m, 2 H), 7.53-7.63 (m, 1 H), 7.69 (d, 1 H), 8.56 (d, 1 H), [further signals hidden under solvent peaks].





1) The minor enantiomers formed in the reactions (partial racemization under these conditions) were separated off on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250 × 20 mm, mobile phase: 50% isohexane, 50% ethanol, 0.2% diethylamine, flow rate: 20 ml/min; 25° C./40° C., detection: 210/220 nm].






Example 172
8-[(2,6-Difluorobenzyl)oxy]-2,6-dimethyl-N-[(2S)-piperidin-2-ylmethyl]imidazo[1,2-a]pyridine-3-carboxamide




At RT, 53 mg (0.25 mmol, 1.1 equivalents) of tert-butyl (2S)-2-(aminomethyl)piperidin-1-carboxylate were added to 75 mg of 8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxylic acid (Example 21A, 0.23 mmol, 1 equivalent), 90 mg of O-(7-azabenzotriazol-1-yl)-N,N,N′N′-tetramethyluronium hexafluorophosphate (HATU, 0.24 mmol, 1.05 equivalents) and 88 mg of N,N-diisopropylethylamine (0.12 ml, 0.68 mmol, 3 equivalents) in 1.4 ml of DMF, and the mixture was stirred at RT overnight. After the reaction had ended, the mixture was purified by preparative HPLC (method: RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). The product fractions obtained were dissolved in dichloromethane and washed with saturated aqueous sodium bicarbonate solution. The aqueous phase was extracted twice with dichloromethane and the combined organic phases were dried over sodium sulphate, filtered, concentrated and lyophilized. This gave 66 mg (64% of theory; purity 95%) of the title compound.
LC-MS (Method 2): Rt=0.65 min
MS (ESpos): m/z=429.3 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.99-1.14 (m, 1H), 1.21-1.36 (m, 2H), 1.45-1.54 (m, 1H), 1.59-1.66 (m, 1H), 1.70-1.77 (m, 1H), 2.31 (s, 3H), 2.60-2.69 (m, 1H), 2.92-2.98 (m, 1H), 3.16-3.29 (m, 2H), 5.28 (s, 2H), 6.91 (s, 1H), 7.24 (t, 2H), 7.55-7.64 (m, 1H), 7.74 (t, 1H), 8.46 (s, 1H), [further signal hidden under solvent peaks].
Example 173
8-[(2,6-Difluorobenzyl)oxy]-2,6-dimethyl-N-[(2R)-piperidin-2-ylmethyl]imidazo[1,2-a]pyridine-3-carboxamide




56 mg of tert-butyl (2R)-2-{[({8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]methyl}piperidin-1-carboxylate trifluoroacetate Example 183A (0.09 mmol) were initially charged in 2 M hydrochloric acid in diethyl ether, and the mixture was stirred at RT for 5 h. The resulting precipitate was filtered off and washed with diethyl ether, dissolved in dichloromethane and washed with saturated aqueous sodium bicarbonate solution. The aqueous phase was extracted twice with dichloromethane and the combined organic phases were dried over sodium sulphate, filtered, concentrated and lyophilized. This gave 30 mg (78% of theory; purity 95%) of the title compound.
LC-MS (Method 2): Rt=0.64 min
MS (ESpos): m/z=429.3 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.99-1.14 (m, 1H), 1.21-1.36 (m, 2H), 1.45-1.54 (m, 1H), 1.59-1.66 (m, 1H), 1.71-1.77 (m, 1H), 2.31 (s, 3H), 2.60-2.69 (m, 1H), 2.92-2.98 (m, 1H), 3.16-3.29 (m, 2H), 5.28 (s, 2H), 6.90 (s, 1H), 7.24 (t, 2H), 7.55-7.64 (m, 1H), 7.74 (t, 1H), 8.46 (s, 1H), [further signal hidden under solvent peaks].
Example 174
ent-N-[(3S)-3-Aminobutan-2-yl]-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (diastereomer A)




44.1 mg of N-[(3S)-3-aminobutan-2-yl]-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide (Example 120) were separated into the diastereomers on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% ethanol, 0.2% diethylamine, flow rate: 20 ml/min; 25° C., detection: 230 nm].
Yield diastereomer A: 19.7 mg (100% ee)
Diastereomer A: Rt=8.90 min [Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: mobile phase: 50% isohexane, 50% ethanol, 0.2% diethylamine, flow rate: 1 ml/min; 25° C., detection: 230 nm].
Example 175
ent-N-[(3S)-3-Aminobutan-2-yl]-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (Diastereomer B)




44.1 mg of rac-N-[(3S)-3-aminobutan-2-yl]-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide (Example 120) were separated into the diastereomers on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% ethanol, 0.2% diethylamine, flow rate: 20 ml/min; 25° C., detection: 230 nm].
Yield diastereomer B: 2.3 mg (>90% ee)
Diastereomer A: Rt=12.68 min [Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: mobile phase: 50% isohexane, 50% ethanol, 0.2% diethylamine, flow rate: 1 ml/min; 25° C., detection: 230 nm].
Example 176
ent-N-[(3R)-3-Aminobutan-2-yl]-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (diastereomer A) 




90 mg of rac-benzyl {(2R)-3-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]butan-2-yl}carbamate (Example 121) were separated into the diastereomers on a chiral phase [column: Daicel Chiralpak OD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% isopropanol, 0.2% diethylamine, flow rate: 20 ml/min; 25° C., detection: 230 nm].
Yield diastereomer A: 29.6 mg (100% ee)
Diastereomer A: Rt=5.94 min [Daicel Chiralpak OD-H, 5 μm, 250×20 mm, mobile phase: mobile phase: 50% isohexane, 50% ethanol, 0.2% diethylamine, flow rate: 1 ml/min; 25° C., detection: 230 nm].
Example 177
ent-N-[(3R)-3-Aminobutan-2-yl]-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (diastereomer B)




90 mg of rac-benzyl {(2R)-3-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]butan-2-yl}carbamate (Example 121) were separated into the diastereomers on a chiral phase [column: Daicel Chiralpak OD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% isopropanol, 0.2% diethylamine, flow rate: 20 ml/min; 25° C., detection: 230 nm].
Yield diastereomer B: 4.9 mg (88% ee)
Diastereomer B: Rt=9.79 min [Daicel Chiralpak OD-H, 5 μm, 250×20 mm, mobile phase: mobile phase: 50% isohexane, 50% ethanol, 0.2% diethylamine, flow rate: 1 ml/min; 25° C., detection: 230 nm]
Example 178
ent-N-[2-Amino-1-(3,4-difluorophenyl)ethyl]-8-(cyclohexylmethoxy)-2-methylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer A)




113 mg of rac-N-[2-amino-1-(3,4-difluorophenyl)ethyl]-8-(cyclohexylmethoxy)-2-methylimidazo[1,2-a]pyridine-3-carboxamide (Example 46) were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak OD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% ethanol, 0.2% diethylamine, flow rate: 20 ml/min; 25° C., detection: 230 nm].
Yield: Enantiomer A: 18.5 mg (89% ee)
Enantiomer A: Rt=7.89 min [Daicel Chiralpak OD-H, 5 μm, 250×4.6 mm, mobile phase: mobile phase: 50% isohexane, 50% ethanol, 0.2% diethylamine, flow rate: 1 ml/min; 40° C., detection: 220 nm].
Example 179
ent-N-[2-Amino-1-(3,4-difluorophenyl)ethyl]-8-(cyclohexylmethoxy)-2-methylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer B)




113 mg of rac-N-[2-amino-1-(3,4-difluorophenyl)ethyl]-8-(cyclohexylmethoxy)-2-methylimidazo[1,2-a]pyridine-3-carboxamide (Example 46) were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak OD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% ethanol, 0.2% diethylamine, flow rate: 20 ml/min; 25° C., detection: 230 nm].
Yield: Enantiomer B: 28 mg (97% ee)
Enantiomer B: Rt=12.84 min [Daicel Chiralpak OD-H, 5 μm, 250×4.6 mm, mobile phase: mobile phase: 50% isohexane, 50% ethanol, 0.2% diethylamine, flow rate: 1 ml/min; 40° C., detection: 220 nm].
Example 180
ent-8-[(2,6-Difluorobenzyl)oxy]-2-methyl-N-[2-(morpholin-4-yl)propyl]imidazo[1,2-a]pyridine-3-carboxamide (enantiomer A) 




120 mg of rac-8-[(2,6-difluorobenzyl)oxy]-2-methyl-N-[2-(morpholin-4-yl)propyl]imidazo[1,2-a]-pyridine-3-carboxamide (Example 132) were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% isopropanol, 0.2% diethylamine, flow rate: 20 ml/min; 40° C., detection: 210 nm].
Yield: Enantiomer A: 45 mg (100% ee)
Enantiomer A: Rt=8.99 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm, mobile phase: mobile phase: 50% isohexane, 50% isopropanol, 0.2% diethylamine, flow rate: 1 ml/min; 40° C., detection: 220 nm].
Example 181
ent-8-[(2,6-Difluorobenzyl)oxy]-2-methyl-N-[2-(morpholin-4-yl)propyl]imidazo[1,2-a]pyridine-3-carboxamide (enantiomer B)




120 mg of rac-8-[(2,6-difluorobenzyl)oxy]-2-methyl-N-[2-(morpholin-4-yl)propyl]imidazo[1,2-a]-pyridine-3-carboxamide (Example 132) were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% isopropanol, 0.2% diethylamine, flow rate: 20 ml/min; 40° C., detection: 210 nm].
Yield: Enantiomer B: 47 mg (97% ee)
Enantiomer B: Rt=11.00 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm, mobile phase: mobile phase: 50% isohexane, 50% isopropanol, 0.2% diethylamine, flow rate: 1 ml/min; 40° C., detection: 220 nm].
Example 182
ent-8-[(2,6-Difluorobenzyl)oxy]-2-methyl-N-[2-(morpholin-4-yl)-1-phenylethyl]imidazo[1,2-a]-pyridine-3-carboxamide (enantiomer A)




128 mg of rac-8-[(2,6-difluorobenzyl)oxy]-2-methyl-N-[2-(morpholin-4-yl)-1-phenylethyl]-imidazo-[1,2-a]pyridine-3-carboxamide (Example 134) were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% ethanol, 0.2% diethylamine, flow rate: 20 ml/min; 25° C., detection: 230 nm].
Yield: Enantiomer A: 27 mg (100% ee)
Enantiomer A: Rt=8.96 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm, mobile phase: 50% isohexane, 50% ethanol, 0.2% diethylamine, flow rate: 1 ml/min; 40° C., detection: 220 nm].
Example 183 
ent-8-[(2,6-Difluorobenzyl)oxy]-2-methyl-N-[2-(morpholin-4-yl)-1-phenylethyl]imidazo[1,2-a]-pyridine-3-carboxamide (enantiomer B)




128 mg of rac-8-[(2,6-difluorobenzyl)oxy]-2-methyl-N-[2-(morpholin-4-yl)-1-phenylethyl]-imidazo-[1,2-a]pyridine-3-carboxamide (Example 134) were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% ethanol, 0.2% diethylamine, flow rate: 20 ml/min; 25° C., detection: 230 nm].
Yield: Enantiomer B: 23 mg (100% ee)
Enantiomer B: Rt=13.66 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm, mobile phase: 50% isohexane, 50% ethanol, 0.2% diethylamine, flow rate: 1 ml/min; 40° C., detection: 220 nm].
Example 184
ent-N-(3-Azabicyclo[4.1.0]hept-1-yl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer A) 




111 mg of Example 125 were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% isopropanol, 0.2% diethylamine, flow rate: 20 ml/min; 40° C., detection: 210 nm].
Yield: Enantiomer A: 32 mg (99% ee)
Enantiomer A: Rt=8.04 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm, mobile phase: 50% isohexane, 50% ethanol, 0.2% diethylamine, flow rate: 1 ml/min; 40° C., detection: 220 nm].
Example 185
ent-N-(3-Azabicyclo[4.1.0]hept-1-yl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer B)




111 mg of Example 125 were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% isopropanol, 0.2% diethylamine, flow rate: 20 ml/min; 40° C., detection: 210 nm].
Yield: Enantiomer B: 31 mg (100% ee)
Enantiomer B: Rt=11.10 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm, mobile phase: 50% isohexane, 50% ethanol, 0.2% diethylamine, flow rate: 1 ml/min; 40° C., detection: 220 nm].
Example 186
ent-8-[(2,6-Difluorobenzyl)oxy]-2,6-dimethyl-N-[2-(morpholin-4-yl)propyl]imidazo[1,2-a]-pyridine-3-carboxamide (enantiomer A)




63 mg of Example 138 were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% isopropanol, 0.2% diethylamine, flow rate: 20 ml/min; 40° C., detection: 210 nm].
Yield: Enantiomer A: 21 mg (96% ee)
Enantiomer A: Rt=8.73 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm, mobile phase: 50% isohexane, 50% isopropanol+0.2% diethylamine, flow rate: 1 ml/min; 40° C., detection: 220 nm].
Example 187
ent-8-[(2,6-Difluorobenzyl)oxy]-2,6-dimethyl-N-[2-(morpholin-4-yl)propyl]imidazo[1,2-a]-pyridine-3-carboxamide (enantiomer B) 




63 mg of Example 138 were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% isopropanol, 0.2% diethylamine, flow rate: 20 ml/min; 40° C., detection: 210 nm].
Yield: Enantiomer B: 25 mg (100% ee)
Enantiomer B: Rt=9.70 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm, mobile phase: 50% isohexane, 50% isopropanol+0.2% diethylamine, flow rate: 1 ml/min; 40° C., detection: 220 nm].
Example 188
ent-8-[(2,6-Difluorobenzyl)oxy]-N-[2-(dimethylamino)-3-methylbutyl]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer A)




130 mg of Example 142 were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine, flow rate: 20 ml/min; 40° C., detection: 210 nm].
Yield: Enantiomer A: 50 mg (99% ee)
Enantiomer A: Rt=8.31 min [column: Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm, mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine, flow rate: 1 ml/min; 40° C., detection: 220 nm].
Example 189
ent-8-[(2,6-Difluorobenzyl)oxy]-N-[2-(dimethylamino)-3-methylbutyl]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer B)




130 mg of Example 142 were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine, flow rate: 20 ml/min; 40° C., detection: 210 nm].
Yield: Enantiomer B: 52 mg (96% ee)
Enantiomer B: Rt=9.66 min [column: Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm, mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine, flow rate: 1 ml/min; 40° C., detection: 220 nm].
Example 190
ent-6-Chloro-8-[(2,6-difluorobenzyl)oxy]-2-methyl-N-(piperidin-2-ylmethyl)imidazo[1,2-a]-pyridine-3-carboxamide (enantiomer A) 




130 mg of Example 118 were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak OZ-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% isopropanol+0.2% diethylamine, flow rate: 15 ml/min; 40° C., detection: 220 nm].
Yield: Enantiomer A: 65 mg (99% ee)
Enantiomer A: Rt=10.35 min [column: Daicel Chiralpak OZ-H, 5 μm, 250×4.6 mm, mobile phase: 70% isohexane, 30% ethanol+0.2% diethylamine, flow rate: 1.0 ml/min; 40° C., detection: 220 nm].
Example 191
ent-6-Chloro-8-[(2,6-difluorobenzyl)oxy]-2-methyl-N-(piperidin-2-ylmethyl)imidazo[1,2-a]-pyridine-3-carboxamide (enantiomer B)




130 mg of Example 118 were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak OZ-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% isopropanol+0.2% diethylamine, flow rate: 15 ml/min; 40° C., detection: 220 nm].
Yield: Enantiomer B: 66 mg (98% ee)
Enantiomer B: Rt=11.67 min [column: Daicel Chiralpak OZ-H, 5 μm, 250×4.6 mm, mobile phase: 70% isohexane, 30% ethanol+0.2% diethylamine, flow rate: 1.0 ml/min; 40° C., detection: 220 nm].
Example 192
ent-N-(2-Amino-4,4,4-trifluorobutyl)-6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer A)




166 mg of Example 147 were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% isopropanol+0.2% diethylamine, flow rate: 12 ml/min; 25° C., detection: 230 nm]. The product fractions were collected on dry ice, combined and concentrated on a rotary evaporator (bath temperature 30° C.) to a residual volume of about 30 ml, and about 60 ml of water were added. The mixture was frozen and lyophilized. The product was re-purified by thick-layer chromatography (mobile phase: dichloromethane/methanol 10:1).
Yield enantiomer A: 23 mg (99% ee)
Enantiomer A: Rt=5.63 min [column: Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm, mobile phase:
50% isohexane, 50% isopropanol+0.2% diethylamine, flow rate: 1.0 ml/min; 40° C., detection: 220 nm].
Example 193 
ent-N-(2-Amino-4,4,4-trifluorobutyl)-6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer B)




166 mg of Example 147 were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% isopropanol+0.2% diethylamine, flow rate: 12 ml/min; 25° C., detection: 230 nm]. The product fractions were collected on dry ice, combined and concentrated on a rotary evaporator (bath temperature 30° C.) to a residual volume of about 30 ml, and about 60 ml of water were added. The mixture was frozen and lyophilized. The product was re-purified by thick-layer chromatography (mobile phase: dichloromethane/methanol 10:1).
Yield: Enantiomer B: 22 mg (99% ee)
Enantiomer B: Rt=6.13 min [column: Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm, mobile phase: 50% isohexane, 50% isopropanol+0.2% diethylamine, flow rate: 1.0 ml/min; 40° C., detection: 220 nm].
Example 194
ent-N-(2-Amino-2-methylbutyl)-6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer A) 




190 mg of Example 157 were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AZ-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine, flow rate: 15 ml/min; 35° C., detection: 220 nm]. The product fractions were collected on dry ice, combined and concentrated on a rotary evaporator (bath temperature 30° C.) to a residual volume of about 30 ml, and about 60 ml of water were added. The mixture was frozen and lyophilized.
Yield: Enantiomer A: 54 mg (98% ee)
Enantiomer A: Rt=8.39 min [column: Daicel Chiralpak AZ-H, 5 μm, 250×4.6 mm, mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine, flow rate: 1.0 ml/min; 35° C., detection: 250 nm].
Specific rotation [α](436 nm, 19.8° C.)=−3.2° (c=0.0044 g/ml, acetonitrile)
Example 195
ent-N-(2-Amino-2-methylbutyl)-6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer B) 




190 mg of Example 157 were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak AZ-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine, flow rate: 15 ml/min; 35° C., detection: 220 nm]. The product fractions were collected on dry ice, combined and concentrated on a rotary evaporator (bath temperature 30° C.) to a residual volume of about 30 ml, and about 60 ml of water were added. The mixture was frozen and lyophilized.
Yield: Enantiomer B: 71 mg (90% ee)
Enantiomer B: Rt=9.04 min [column: Daicel Chiralpak AZ-H, 5 μm, 250×4.6 mm, mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine, flow rate: 1.0 ml/min; 35° C., detection: 250 nm].
Example 196
ent-N-(2-Amino-3-methoxy-2-methylpropyl)-6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer A)




218 mg of Example 159 were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak OZ-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine, flow rate: 15 ml/min; 40° C., detection: 220 nm]. The product fractions were collected on dry ice, combined and concentrated on a rotary evaporator (bath temperature 30° C.) to a residual volume of about 30 ml, and about 60 ml of water were added. The mixture was frozen and lyophilized.
Yield: Enantiomer A: 136 mg (99% ee)
Enantiomer A: Rt=7.68 min [column: Daicel Chiralpak OZ-H, 5 μm, 250×4.6 mm, mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine, flow rate: 1.0 ml/min; 40° C., detection: 270 nm].
Example 197
ent-N-(2-Amino-3-methoxy-2-methylpropyl)-6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer B)




218 mg of Example 159 were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak OZ-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine, flow rate: 15 ml/min; 40° C., detection: 220 nm]. The product fractions were collected on dry ice, combined and concentrated on a rotary evaporator (bath temperature 30° C.) to a residual volume of about 30 ml, and about 60 ml of water were added. The mixture was frozen and lyophilized.
Yield: Enantiomer B: 60 mg (98% ee)
Enantiomer B: Rt=10.17 min [column: Daicel Chiralpak OZ-H, 5 μm, 250×4.6 mm, mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine, flow rate: 1.0 ml/min; 40° C., detection: 270 nm].
Example 198
ent-N-(2-Amino-3-methoxy-2-methylpropyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo-[1,2-a]pyridine-3-carboxamide (enantiomer A)




200 mg of Example 166 were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak OZ-H, 5 μm, 250×20 mm, mobile phase: 25% isohexane, 75% ethanol+0.2% diethylamine, flow rate: 12 ml/min; 45° C., detection: 220 nm]. The product fractions were collected on dry ice, combined and concentrated on a rotary evaporator (bath temperature 30° C.) to a residual volume of about 30 ml, and about 60 ml of water were added. The mixture was frozen and lyophilized.
Yield: Enantiomer A: 112 mg (99% ee)
Enantiomer A: Rt=7.31 min [column: Daicel Chiralpak OZ-H, 5 μm, 250×4.6 mm, mobile phase: 25% isohexane, 75% ethanol+0.2% diethylamine, flow rate: 1.0 ml/min; 45° C., detection: 235 nm].
Example 199
ent-N-(2-Amino-3-methoxy-2-methylpropyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo-[1,2-a]pyridine-3-carboxamide (enantiomer B) 




200 mg of Example 166 were separated into the enantiomers on a chiral phase [column: Daicel Chiralpak OZ-H, 5 μm, 250×20 mm, mobile phase: 25% isohexane, 75% ethanol+0.2% diethylamine, flow rate: 12 ml/min; 45° C., detection: 220 nm]. The product fractions were collected on dry ice, combined and concentrated on a rotary evaporator (bath temperature 30° C.) to a residual volume of about 30 ml, and about 60 ml of water were added. The mixture was frozen and lyophilized.
Yield: Enantiomer B: 50 mg (98% ee)
Enantiomer B: Rt=10.00 min [column: Daicel Chiralpak OZ-H, 5 μm, 250×4.6 mm, mobile phase: 25% isohexane, 75% ethanol+0.2% diethylamine, flow rate: 1.0 ml/min; 45° C., detection: 235 nm].
Example 200
ent-N-[(2S)-Amino-2-methylbutyl]-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer A)




With gentle warming, 3.55 g (6.45 mmol) of ent-benzyl {1-[({8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]-2-methylbutan-2-yl}carbamate (enantiomer A) Example 276A were dissolved in 70 ml of ethanol, and 226 mg of palladium(II) hydroxide on activated carbon (20%) were added under argon. The reaction mixture was hydrogenated under atmospheric pressure at RT for 2 h. The reaction mixture was filtered off through Celite, the filter cake was washed thoroughly with ethanol and the filtrate was concentrated. The crude product was purified by silica gel chromatography (mobile phase: dichloromethane/2 N ammonia in methanol=10/0.5). This gave 2.27 g of the target compound (85% of theory; purity 99%).
LC-MS (Method 2): Rt=0.62 min
MS (ESIpos): m/z=417 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.87 (t, 3H), 0.97 (s, 3H), 1.31-1.39 (m, 2H), 1.43 (br. s, 2H), 2.31 (s, 3H), 2.53 (s, 3H, superimposed by DMSO signal), 3.14-3.27 (m, 2H), 5.29 (s, 2H), 6.91 (s, 1H), 7.19-7.27 (m, 2H), 7.54-7.64 (m, 2H), 8.49 (s, 1H).
Specific rotation [α](365 nm, 20.0° C.)=−6.6° (c=0.0044 g/ml, acetonitrile)
Single crystal X-ray structure analysis confirmed the S configuration for this enantiomer.
Example 201
ent-N-(2-Amino-2-methylbutyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer B)




With gentle warming, 2.10 g (3.66 mmol) of ent-benzyl {1-[({8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]-2-methylbutan-2-yl}carbamate (enantiomer B) Example 277A were dissolved in 40 ml of ethanol, and 257 mg of palladium(II) hydroxide on activated carbon (20%) were added under argon. The reaction mixture was hydrogenated under atmospheric pressure at RT for 2 h. The reaction mixture was filtered off through Celite, the filter cake was washed thoroughly with ethanol and the filtrate was concentrated. The crude product was purified by silica gel chromatography (mobile phase: dichloromethane/2 N ammonia in methanol=10/0.5). This gave 1.26 g of the target compound (82% of theory; purity 99%).
LC-MS (Method 2): Rt=0.66 min
MS (ESIpos): m/z=417 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.87 (t, 3H), 0.98 (s, 3H), 1.31-1.39 (m, 2H), 1.49 (br. s, 2H), 2.31 (s, 3H), 2.53 (s, 3H, superimposed by DMSO signal), 3.14-3.27 (m, 2H), 5.29 (s, 2H), 6.91 (s, 1H), 7.19-7.27 (m, 2H), 7.54-7.64 (m, 2H), 8.49 (s, 1H).
Specific rotation [α](365 nm, 20.1° C.)=+4.4° (c=0.0044 g/ml, acetonitrile)
Example 202
rac-N-(2-Amino-2,4-dimethylpentyl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide




150 mg (0.47 mmol) of 8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid Example 3A were initially charged in DMF (1.7 ml), and 159 mg (0.50 mmol) of TBTU and 0.16 ml (1.41 mmol) of 4-methylmorpholine were added. 68 mg (0.52 mmol) of rac-2,4-dimethylpentane-1,2-diamine were then added, and the reaction mixture was stirred at RT overnight. Another 6.1 mg (0.04 mmol) of rac-2,4-dimethylpentane-1,2-diamine were added, and the reaction mixture was stirred at RT for 20 min. The mixture was diluted with water/TFA and purified by prep. RP-HPLC (acetonitrile/water gradient with addition of 0.1% TFA). The product fraction was concentrated. The residue was taken up in dichloromethane and a few drops of methanol and washed twice with saturated aqueous sodium bicarbonate solution, and the aqueous phase was extracted three times with dichloromethane. The organic phase was dried over sodium sulphate, filtered off and concentrated. This gave 126 mg (61% of theory, purity 97%) of the target compound.
LC-MS (Method 2): Rt=0.70 min
MS (ESIpos): m/z=431 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.89 (d, 3H), 0.95 (d, 3H), 1.02 (s, 3H), 1.20-1.33 (m, 2H), 1.42 (br. s, 2H), 1.74-1.85 (m, 1H), 2.56 (s, 3H), 3.14-3.27 (m, 2H), 5.30 (s, 2H), 6.94 (t, 1H), 7.01 (d, 1H), 7.19-7.29 (m, 2H), 7.54-7.63 (m, 1H), 7.64-7.71 (m, 1H), 8.64 (d, 1H).
Example 203
ent-N-(2-Amino-2,4-dimethylpentyl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer A)




122 mg of Example 202 were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine, flow rate: 20 ml/min; 40° C., detection: 210 nm]. The product fractions were collected on dry ice, combined and concentrated on a rotary evaporator (bath temperature 30° C.) to a residual volume of about 30 ml, and about 60 ml of water were added. The solution obtained was frozen and lyophilized.
Enantiomer A: Yield: 28 mg (100% ee)
Rt=8.71 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 40° C.; detection: 220 nm].
Example 204
ent-N-(2-Amino-2,4-dimethylpentyl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer B)




122 mg of Example 202 were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine, flow rate: 20 ml/min; 40° C., detection: 210 nm]. The product fractions were collected on dry ice, combined and concentrated on a rotary evaporator (bath temperature 30° C.) to a residual volume of about 30 ml, and about 60 ml of water were added. The solution obtained was frozen and lyophilized.
Enantiomer B: Yield: 68 mg (92% ee)
Rt=9.79 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 40° C.; detection: 220 nm].
Example 205
rac-N-(2-Amino-3-isopropoxypropyl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide




125 mg (0.33 mmol) of HATU and 0.16 ml (0.90 mmol) of N,N-diisopropylethylamine were added to 95 mg (0.30 mmol) of 8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid Example 3A in DMF (1.9 ml), and the mixture was stirred at RT for 20 min. At −20° C., 145 mg (0.54 mmol, 76% pure) of rac-3-isopropoxypropane-1,2-diamine dihydrochloride Example 224A in DMF (0.5 ml), to which 0.31 ml (1.8 mmol) of N,N-diisopropylethylamine had been added beforehand and which had been stirred at RT for 10 min, were then slowly added dropwise to the reaction mixture. The mixture was stirred at RT overnight. The mixture was then diluted with water/TFA and purified by prep. RP-HPLC (acetonitrile/water gradient with addition of 0.1% TFA). The product fraction was concentrated and then re-purified by thick-layer chromatography (dichloromethane/methanol: 10:1). This gave 15 mg (12% of theory) of the target compound.
LC-MS (Method 2): Rt=0.68 min.
MS (ESIpos): m/z=433 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.10 (d, 6H), 1.24 (s, 2H), 2.57 (s, 3H; superimposed by DMSO signal), 3.00-3.08 (m, 1H), 3.28-3.48 (m, 4H), 3.51-3.59 (m, 1H), 5.30 (s, 2H), 6.92 (t, 1H), 7.00 (d, 1H), 7.24 (t, 2H), 7.53-7.63 (m, 1H), 7.70 (t, 1H), 8.64 (d, 1H).
Example 206
rac-N-(2-Amino-3-isopropoxypropyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxamide




Preparation and purification of the title compound were carried out analogously to Example 205. Starting with 11.2 mg (0.03 mmol) of 8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxylic acid Example 21A and 15.0 mg (0.05 mmol, 76% pure) of rac-3-isopropoxypropane-1,2-diaminedihydrochloride Example 224A, 1.6 mg (9.5% of theory) of the target compound were obtained.
LC-MS (Method 2): Rt=0.65 min
MS (ESIpos): m/z=447 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.14 (d, 6H), 1.25 (s, 2H), 2.32 (s, 3H), 2.54 (s, 3H; superimposed by DMSO signal), 3.35-3.42 (m, 1H), 3.44-3.66 (m, 5H), 5.31 (s, 2H), 6.94 (s, 1H), 7.24 (t, 2H), 7.56-7.66 (m, 1H), 7.80 (t, 1H), 8.53 (s, 1H).
Example 207
rac-N-(2-Amino-3,3,3-trifluoropropyl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide 




Preparation and purification of the title compound were carried out analogously to Example 141. Starting with 400 mg (1.26 mmol) of 8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid Example 3A and 278 mg (1.38 mmol) of rac-1-(trifluoromethyl)ethylene-1,2-diamine dihydrochloride, 340 mg (63% of theory) of the target compound were obtained.
LC-MS (Method 7): Rt=0.70 min
MS (ESIpos): m/z=429 (M+H)+.
1H NMR (400 MHz, DMSO-d6): δ=2.55 (s, 3H; superimposed by DMSO signal), 3.49-3.62 (m, 1H), 3.67-3.77 (m, 1H), 3.89-4.10 (m, 1H), 5.31 (s, 2H), 6.99 (t, 1H), 7.07 (d, 1H), 7.19-7.29 (m, 2H), 7.54-7.65 (m, 1H), 7.96 (t, 1H), 8.71 (d, 1H).
Example 208
ent-N-(2-Amino-3,3,3-trifluoropropyl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer A)




464 mg of Example 207 were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% isopropanol+0.2% diethylamine, flow rate: 20 ml/min; 40° C., detection: 210 nm].
Enantiomer A: Yield: 120 mg (100% ee)
Rt=8.87 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% isopropanol+0.2% diethylamine; flow rate 1.0 ml/min; 40° C.; detection: 220 nm].
Example 209
ent-N-(2-Amino-3,3,3-trifluoropropyl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer B)




464 mg of Example 207 were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% isopropanol+0.2% diethylamine, flow rate: 20 ml/min; 40° C., detection: 210 nm].
Enantiomer B: Yield: 122 mg (92.6% ee)
Rt=10.05 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% isopropanol+0.2% diethylamine; flow rate 1.0 ml/min; 40° C.; detection: 220 nm].
Example 210
ent-N-(1-amino-3-methoxypropan-2-yl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxamide trifluoroacetate (enantiomer) 




Under argon, 100 mg (0.18 mmol) of ent-benzyl {2-[({8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]-3-methoxypropyl}carbamate, prepared according to the Representative Working Procedure 3 using Examples 21A and 248A) were initially charged in ethanol (1.3 ml), and 19.2 mg (0.02 mmol, 10%) of palladium on activated carbon and 0.37 ml (3.62 mmol) of cyclohexene were added. The reaction mixture was stirred under reflux overnight. The reaction mixture, cooled to RT, was filtered through a Millipore® filter, the filter cake was washed with ethanol and the filtrate was concentrated. The residue was purified by prep. RP-HPLC (acetonitrile/water gradient with addition of 0.1% TFA). The product fraction was concentrated, then taken up in dichloromethane and washed twice with saturated aqueous sodium bicarbonate solution. The aqueous phase was extracted twice with dichloromethane. The combined organic phases were dried over sodium sulphate, filtered off and concentrated. This gave 24 mg (22% of theory, purity 90%) of the title compound.
LC-MS (Method 7): Rt=0.59 min
MS (ESIpos): m/z=419 (M−TFA+H)+
1H NMR (400 MHz, DMSO-d6): δ=2.36 (s, 3H), 2.53 (s, 3H; superimposed by DMSO signal), 2.93-3.04 (m, 1H), 3.06-3.17 (m, 1H), 3.32 (s, 3H), 3.47-3.54 (m, 2H), 4.37-4.48 (m, 1H), 5.34 (s, 2H), 7.10-7.19 (m, 1H), 7.21-7.39 (m, 2H), 7.61 (quintet, 1H), 7.83-8.00 (m, 2H), 8.46 (s, 1H).
Example 211
ent-N-(2-Amino-3-methylbutyl)-6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer A) 




124 mg (0.23 mmol) of ent-tert-butyl {1-[({6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]-3-methylbutan-2-yl}carbamate Example 228A were initially charged in 1.16 ml (2.31 mmol) of 2 N hydrogen chloride/diethyl ether, and the mixture was stirred at RT for 3.5 h. The reaction solution was then concentrated. Ethyl acetate and saturated aqueous sodium bicarbonate solution were added to the residue. After phase separation, the aqueous phase was extracted twice with ethyl acetate and the combined organic phases were dried over sodium sulphate, filtered and concentrated. This gave 89 mg (87% of theory, purity 99%) of the title compound.
LC-MS (Method 2): Rt=0.73 min
MS (ESIpos): m/z=437 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.88 (d, 3H), 0.92 (d, 3H), 1.57-1.68 (m, 1H), 1.86-2.24 (br. s, 2H), 2.53 (s, 3H; superimposed by DMSO signal), 2.63-2.70 (m, 1H), 3.05-3.14 (m, 1H), 3.39-3.46 (m, 1H), 5.34 (s, 2H), 7.19 (d, 1H), 7.26 (t, 2H), 7.61 (quintet, 1H), 7.72-7.88 (br. s, 1H), 8.78 (d, 1H).
Example 212
ent-N-(2-Amino-3-methylbutyl)-6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer B) 




Preparation and purification (use of dichloromethane for work-up) of the title compound were carried out analogously to Example 211. Starting with 122 mg (0.23 mmol) of ent-tert-butyl {1-[({6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]-3-methylbutan-2-yl}carbamate (enantiomer B) Example 229A, 81 mg (81% of theory, purity 99%) of the title compound were obtained.
LC-MS (Method 2): Rt=0.73 min
MS (ESIpos): m/z=437 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.88 (d, 3H), 0.91 (d, 1H), 1.45-1.78 (m, 3H), 2.52 (s, 3H; superimposed by DMSO signal), 2.61-2.69 (m, 1H), 3.04-3.13 (m, 1H), 3.38-3.45 (m, 1H), 5.34 (s, 2H), 7.19 (d, 1H), 7.26 (t, 2H), 7.60 (quintet, 1H), 7.71-7.88 (br. s, 1H), 8.78 (d, 1H).
Example 213
rac-N-(2-Amino-3-methoxy-2-methylpropyl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide 




180 mg (0.57 mmol) of 8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid Example 3A, 237 mg (0.62 mmol) of HATU and 0.30 ml (1.70 mmol) of N,N-diisopropylethylamine were initially charged in 3.6 ml of DMF, and the mixture was stirred at RT for 20 min. 74 mg (0.62 mmol) of rac-3-methoxy-2-methylpropane-1,2-diamine were then added and the reaction mixture was stirred at RT overnight. The reaction solution was diluted with water/TFA and purified by preparative RP-HPLC (acetonitrile/water gradient with addition of 0.1% TFA). The product fraction was concentrated. The residue was taken up in dichloromethane and washed twice with saturated aqueous sodium bicarbonate solution. The aqueous phase was extracted twice with dichloromethane and the combined organic phases were dried over sodium sulphate, filtered and concentrated. This gave 136 mg (56% of theory, purity 98%) of the title compound.
LC-MS (Method 2): Rt=0.56 min
MS (ESIpos): m/z=419 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.00 (s, 3H), 1.53 (br. s, 2H), 2.56 (s, 3H; superimposed by DMSO signal), 3.13-3.19 (m, 2H), 3.24-3.32 (m, 5H; superimposed by solvent signal), 5.30 (s, 2H), 6.94 (t, 1H), 7.02 (d, 1H), 7.19-7.29 (m, 2H), 7.59 (quintet, 2H), 8.69 (d, 1H).
Example 214
ent-N-(2-Amino-3-methoxy-2-methylpropyl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer A) 




130 mg of Example 213 were separated into the enantiomers by preparative separation on a chiral phase [column: Phenomenex Amylose II, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine, flow rate: 20 ml/min; 25° C., detection: 230 nm].
Enantiomer A: Yield: 32.4 mg (100% ee)
Rt=5.89 min [Daicel Chiralpak AY-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 40° C.; detection: 220 nm].
Example 215
ent-N-(2-Amino-3-methoxy-2-methylpropyl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer B)




130 mg of Example 213 were separated into the enantiomers by preparative separation on a chiral phase [column: Phenomenex Amylose II, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine, flow rate: 20 ml/min; 25° C., detection: 230 nm].
Enantiomer B: Yield: 79.5 mg (100% ee)
Rt=8.01 min [Daicel Chiralpak AY-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 40° C.; detection: 220 nm].
Example 216
N-[(3-Aminooxetan-3-yl)methyl]-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxamide




Preparation and purification of the title compound were carried out analogously to Example 205. Starting with 45 mg (0.14 mmol) of 8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxylic acid Example 21A and 95 mg (0.41 mmol, 75% pure) of 3-(aminomethyl)oxetan-3-amine dihydrochloride Example 226A. After additional purification [column: XBridge C18, 5 μm, 150×19 mm, mobile phase: 32% water, 60% methanol+8% 1% strength ammonia in water, flow rate: 25 ml/min; 25° C., detection: 210 nm], 21 mg (37% of theory, purity 100%) of the target compound were obtained.
LC-MS (Method 2): Rt=0.63 min
MS (ESIpos): m/z=417 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=2.30 (s, 3H), 3.52-3.62 (m, 2H), 4.29 (d, 2H), 4.43 (d, 2H), 5.29 (s, 2H), 6.92 (s, 1H), 7.19-7.28 (m, 2H), 7.54-7.65 (m, 1H), 7.88-7.98 (m, 1H), 8.44 (s, 1H), [additional signal under DMSO peak].
Example 217
rac-N-(2-Amino-3-isopropoxypropyl)-6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide 




Preparation and purification of the title compound were carried out analogously to Example 205. Starting with 11.9 mg (0.03 mmol) of 6-Chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid Example 16A and 15.0 mg (0.06 mmol, 76% pure) rac-3-isopropoxypropane-1,2-diamine dihydrochloride Example 224A, 1.9 mg (11% of theory, purity 90%) of the target compound were obtained.
LC-MS (Method 2): Rt=0.76 min
MS (ESIpos): m/z=467 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.14 (d, 6H), 1.23-1.28 (m, 2H), 2.55 (s, 3H; superimposed by DMSO signal), 3.41-3.56 (m, 4H), 3.58-3.65 (m, 1H), 5.34 (s, 2H), 7.19-7.28 (m, 3H), 7.56-7.66 (m, 1H), 8.80 (d, 1H).
Example 218
rac-N-(2-Amino-2,4-dimethylpentyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxamide 




Preparation and purification of the title compound were carried out analogously to Example 202. Starting with 150 mg (0.45 mmol) of 8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxylic acid Example 21A and 65 mg (0.50 mmol) of rac-2,4-dimethylpentane-1,2-diamine, 155 mg (73% of theory, purity 95%) of the target compound were obtained.
LC-MS (Method 2): Rt=0.66 min
MS (ESIpos): m/z=445 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.89-0.96 (m, 6H), 1.02 (s, 3H), 1.21-1.34 (m, 2H), 1.67 (br. s, 2H), 1.74-1.85 (m, 1H), 2.31 (s, 3H), 2.53 (br. s, 3H; superimposed by DMSO signal), 3.14-3.27 (m, 2H), 5.28 (s, 2H), 6.92 (s, 1H), 7.20-7.28 (m, 2H), 7.55-7.68 (m, 2H), 8.48 (s, 1H).
Example 219
ent-N-(2-Amino-2,4-dimethylpentyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer A)




155 mg of Example 218 were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 70% isohexane, 30% ethanol+0.2% diethylamine, flow rate: 20 ml/min; 40° C., detection: 210 nm].
Enantiomer A: Yield: 37 mg (100% ee)
Rt=11.40 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm; mobile phase: 70% isohexane, 30% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 40° C.; detection: 220 nm].
Example 220
ent-N-(2-Amino-2,4-dimethylpentyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer B)




155 mg of Example 218 were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 70% isohexane, 30% ethanol+0.2% diethylamine, flow rate: 20 ml/min; 40° C., detection: 210 nm].
Enantiomer B: Yield: 79 mg (93% ee)
Rt=12.56 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm; mobile phase: 70% isohexane, 30% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 40° C.; detection: 220 nm].
Specific rotation [α](365 nm, 19.6° C.)=+17.7° (c=0.005 g/ml, acetonitrile)
Example 221
N-(2-Amino-2-methylpropyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxamide hydrochloride 




200 mg (0.50 mmol) of N-(2-amino-2-methylpropyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxamide Example 74 were initially charged in 4 ml of diethyl ether, 0.26 ml (0.52 mmol) of 2 N hydrochloric acid in diethyl ether was added and the reaction mixture was stirred at RT for 30 min. The mixture was then concentrated and the residue was lyophilized. This gave 217 mg (98.5% of theory, purity 99%) of the target compound.
LC-MS (Method 7): Rt=0.57 min
MS (ESIpos): m/z=403 (M−HCl+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.24 (s, 6H), 2.32 (s, 3H), 2.55 (br. s, 3H; superimposed by DMSO signal), 3.42 (d, 2H), 5.29 (s, 2H), 6.95 (s, 1H), 7.15 (br. s, 2H), 7.21-7.28 (m, 2H), 7.55-7.64 (m, 1H), 7.96-8.03 (m, 1H), 8.47 (m, 1H).
Example 222
ent-8-[(2,6-Difluorobenzyl)oxy]-N-{1-(3,4-difluorophenyl)-2-[(2,2,2-trifluoroethyl)amino]ethyl}-2-methylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer B) 




100 mg (0.21 mmol) of N-[2-amino-1-(3,4-difluorophenyl)ethyl]-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide Example 13 were initially charged in 2 ml of DMF, 35 μl (0.21 mmol) of 2,2,2-trifluoroethyl trichloromethanesulphonate, 59 mg (0.42 mmol) of potassium carbonate and 3.5 mg (0.02 mmol) of potassium iodide were added and the reaction mixture was stirred at RT overnight. 10 ml of water were added, and the reaction solution was extracted twice with 30 ml of ethyl acetate. The combined organic phases were washed twice with 20 ml of water and with saturated aqueous sodium chloride solution, dried over magnesium sulphate, filtered and concentrated. The residue was purified by preparative RP-HPLC (acetonitrile/water with 0.5% strength formic acid gradient). The product fractions were concentrated almost to dryness, 1 ml of tert-butanol was added and the mixture was lyophilized overnight. This gave 18 mg (14% of theory, purity 91%) of the target compound.
LC-MS (Method 2): Rt=1.05 min
MS (ESIpos): m/z=555 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=2.57 (s, 3H), 2.89-3.08 (m, 2H), 5.09-5.18 (m, 1H), 5.30 (s, 2H), 6.91 (t, 1H), 7.02 (d, 1H), 7.18-7.33 (m, 3H), 7.36-7.46 (m, 1H), 7.47-7.56 (m, 1H), 7.57-7.64 (m, 1H), 8.17 (d, 1H), 8.53 (d, 1H), [further signals hidden under solvent peaks].
Example 223
ent-N-(2-Amino-3-methylbutyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer A) 




88 mg (0.17 mmol) of ent-tert-butyl {1-[({8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]-3-methylbutan-2-yl}carbamate (enantiomer A) Example 231A in 0.85 ml of 2 N hydrochloric acid/diethyl ether were stirred at RT for 4 h. The reaction mixture was concentrated and the residue was dissolved in dichloromethane and saturated aqueous sodium bicarbonate solution. The aqueous phase was extracted twice with dichloromethane and the combined organic phases were dried over sodium sulphate, filtered, concentrated and lyophilized. This gave 64 mg (88% of theory, purity 98%) of the target compound.
LC-MS (Method 7): Rt=0.62 min
MS (ESIpos): m/z=417 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.88 (d, 3H), 0.92 (d, 3H), 1.39-1.56 (br. s, 2H), 1.56-1.65 (m, 1H), 2.31 (s, 3H), 2.60-2.66 (m, 1H), 3.02-3.11 (m, 1H), 3.38-3.45 (m, 1H), 5.28 (s, 2H), 6.91 (s, 1H), 7.20-7.28 (m, 2H), 7.55-7.64 (m, 1H), 7.70 (t, 1H), 8.49 (s, 1H), [further signal under DMSO peak].
Example 224
ent-N-(2-Amino-3-methylbutyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer B) 




Preparation and purification of the title compound were carried out analogously to Example 223. Starting with 92 mg (0.18 mmol) of ent-tert-butyl {1-[({8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]-3-methylbutan-2-yl}carbamate (enantiomer B) Example 232A, 67 mg (88% of theory, purity 98%) of the target compound were obtained.
LC-MS (Method 7): Rt=0.64 min
MS (ESIpos): m/z=417 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.89 (d, 3H), 0.92 (d, 3H), 1.19-1.30 (br. s, 2H), 1.55-1.69 (m, 2H), 2.31 (s, 3H), 2.60-2.68 (m, 1H), 3.02-3.11 (m, 1H), 3.39-3.46 (m, 1H), 5.28 (s, 2H), 6.91 (s, 1H), 7.20-7.28 (m, 2H), 7.55-7.64 (m, 1H), 7.67-7.73 (m, 1H), 8.48 (s, 1H), [further signal under DMSO peak].
Example 225
rac-N-(2-Amino-2,4-dimethylpentyl)-6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide 




61 mg (0.47 mmol) of rac-2,4-dimethylpentane-1,2-diamine were added to 150 mg (0.43 mmol) of 6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid Example 16A, 143 mg (0.45 mmol) of TBTU and 0.19 ml (1.70 mmol) of 4-methylmorpholine in DMF (1.5 ml), and the reaction mixture was stirred at RT overnight. The mixture was diluted with water/TFA and purified by prep. RP-HPLC (acetonitrile/water gradient with addition of 0.1% TFA). The product fraction was concentrated. Saturated aqueous sodium bicarbonate solution was added to the residue, and the mixture was extracted three times with dichloromethane. The combined organic phases were dried over sodium sulphate, filtered off and concentrated. This gave 162 mg (79% of theory, purity 96%) of the target compound.
LC-MS (Method 7): Rt=0.75 min
MS (ESIpos): m/z=465 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.91 (d, 3H), 0.94 (d, 3H), 1.02 (s, 3H), 1.20-1.33 (m, 2H), 1.35-1.55 (br. s, 2H), 1.73-1.85 (m, 1H), 2.55 (s, 3H; superimposed by DMSO signal), 3.21 (q, 2H), 5.35 (s, 2H), 7.20 (d, 1H), 7.22-7.29 (m, 2H), 7.57-7.65 (m, 1H), 7.67-7.80 (br. s, 1H), 8.76 (d, 1H).
Example 226
ent-N-(2-Amino-2,4-dimethylpentyl)-6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer A) 




155 mg of Example 225 were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak AZ-H, 5 μm, 250×30 mm, mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine, flow rate: 40 ml/min; 25° C., detection: 220 nm]. The product fractions were collected on dry ice, combined and concentrated on a rotary evaporator (bath temperature 30° C.) to a residual volume of about 30 ml, and about 60 ml of water were added. The solution obtained was frozen and lyophilized. The product was then re-purified by thick-layer chromatography (mobile phase: dichloromethane/methanol:20/1).
Enantiomer A: Yield: 18 mg (100% ee)
Rt=8.53 min [Daicel Chiralpak AZ-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 30° C.; detection: 220 nm].
Example 227
ent-N-(2-Amino-2,4-dimethylpentyl)-6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer B) 




155 mg of Example 225 were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak AZ-H, 5 μm, 250×30 mm, mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine, flow rate: 40 ml/min; 25° C., detection: 220 nm]. The product fractions were collected on dry ice, combined and concentrated on a rotary evaporator (bath temperature 30° C.) to a residual volume of about 30 ml, and about 60 ml of water were added. The solution obtained was frozen and lyophilized. The product was then re-purified by thick-layer chromatography (mobile phase: dichloromethane/methanol:20/1).
Enantiomer B: Yield: 31 mg (88% ee)
Rt=10.41 min [Daicel Chiralpak AZ-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 30° C.; detection: 220 nm].
Example 228
ent-N-(2-Amino-3-methylbutyl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer A) 




Preparation and purification of the title compound were carried out analogously to Example 223. Starting with 88 mg (0.18 mmol) of ent-tert-butyl {1-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]-3-methylbutan-2-yl}carbamate (enantiomer A) Example 234A, 64 mg (89% of theory, purity 98%) of the target compound were obtained.
LC-MS (Method 7): Rt=0.61 min
MS (ESIpos): m/z=403 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.90 (d, 3H), 0.94 (d, 3H), 1.19-1.30 (br. s, 2H), 1.64-1.75 (m, 1H), 2.72-2.78 (m, 1H), 3.12-3.21 (m, 1H), 3.41-3.49 (m, 1H), 5.30 (s, 2H), 6.94 (t, 1H), 7.01 (d, 1H), 7.20-7.28 (m, 2H), 7.59 (quintet, 1H), 7.74-7.79 (m, 1H), 8.67 (d, 1H), [further signal under DMSO peak].
Example 229
ent-N-(2-Amino-3-methylbutyl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer B) 




Preparation and purification of the title compound were carried out analogously to Example 223. Starting with 72 mg (0.14 mmol) of ent-tert-butyl {1-[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]-3-methylbutan-2-yl}carbamate (enantiomer B) Example 235A, 52 mg (88% of theory, purity 98%) of the target compound were obtained.
LC-MS (Method 7): Rt=0.63 min
MS (ESIpos): m/z=403 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.88-0.97 (m, 6H), 1.19-1.29 (br. s, 2H), 1.64-1.76 (m, 1H), 2.73-2.80 (m, 1H), 3.14-3.23 (m, 1H), 3.41-3.49 (m, 1H), 5.30 (s, 2H), 6.94 (t, 1H), 7.02 (d, 1H), 7.19-7.28 (m, 2H), 7.59 (quintet, 1H), 7.73-7.82 (m, 1H), 8.67 (d, 1H), [further signal under DMSO peak].
Example 230
rac-N-(2-Amino-3,3,4,4-tetrafluorobutyl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide 




400 mg (1.26 mmol) of 8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid Example 3A, 526 mg (1.38 mmol) of HATU and 1.1 ml (6.28 mmol) of N,N-diisopropyl ethyl amine in DMF (8.0 ml) were stirred at RT for 20 min. 322 mg (1.38 mmol) of rac-1-(1,1,2,2-tetrafluoroethyl)ethylene-1,2-diamine dihydrochloride were then added, and the reaction mixture was stirred at RT overnight. The mixture was then purified directly by preparative RP-HPLC (acetonitrile/water with 0.05% strength formic acid). This gave 283 mg (49% of theory, purity 98%) of the target compound.
LC-MS (Method 2): Rt=0.75 min
MS (ESIpos): m/z=461 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=2.56 (s, 3H; superimposed by DMSO signal), 3.37-3.47 (m, 1H), 3.52-3.67 (m, 1H), 3.67-3.76 (m, 1H), 5.31 (s, 2H), 6.68 (tt, 1H), 6.97 (t, 1H), 7.05 (d, 1H), 7.20-7.28 (m, 2H), 7.54-7.64 (m, 1H), 7.83 (t, 1H), 8.71 (d, 1H).
Example 231
ent-N-(2-Amino-3,3,4,4-tetrafluorobutyl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer A) 




240 mg of Example 230 were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralcel OZ-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine, flow rate: 20 ml/min; 25° C., detection: 230 nm].
Enantiomer A: Yield: 91.6 mg (100% ee)
Rt=9.18 min [Daicel Chiralcel OZ-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 30° C.; detection: 220 nm].
Enantiomer A was re-purified by preparative RP-HPLC (acetonitrile/water with 0.05% strength formic acid). The contaminated product fraction was purified once more [column: Sunfire C18, 5 μm, 250×20 mm, mobile phase: 55% water, 45% acetonitrile, flow rate: 25 ml/min; 25° C., detection: 210 nm]. This gave 48.5 mg (purity 99%) of the target compound.
Example 232
rac-N-(2-Amino-2-methylpentyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxamide




77 mg (0.66 mmol) of rac-2-methylpentane-1,2-diamine were added to 200 mg (0.60 mmol) of 8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylic acid Example 21A, 203 mg (0.63 mmol) of TBTU and 0.27 ml (2.41 mmol) of 4-methylmorpholine in DMF (2.1 ml), and the reaction mixture was stirred at RT overnight. The mixture was diluted with water/TFA and purified by preparative RP-HPLC (acetonitrile/water gradient with addition of 0.1% TFA). The product fraction was concentrated. Saturated aqueous sodium bicarbonate solution was added to the residue, and the mixture was extracted twice with dichloromethane. The combined organic phases were dried over sodium sulphate, filtered off and concentrated. This gave 199 mg (76% of theory, purity 99%) of the target compound.
LC-MS (Method 2): Rt=0.67 min
MS (ESIpos): m/z=431 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.87 (t, 3H), 0.99 (s, 3H), 1.22-1.42 (m, 4H), 1.43-1.67 (br. s, 2H), 2.31 (s, 3H), 2.53 (s, 3H; superimposed by DMSO signal), 3.14-3.26 (m, 2H), 5.28 (s, 2H), 6.91 (s, 1H), 7.20-7.28 (m, 2H), 7.55-7.66 (m, 2H), 8.47 (s, 1H).
Example 233
ent-N-(2-Amino-2-methylpentyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer A)




195 mg of Example 232 were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak AY-H, 5 μm, 250×20 mm, mobile phase: 60% isohexane, 40% ethanol+0.2% diethylamine, flow rate: 20 ml/min; 25° C., detection: 220 nm]. The product was then re-purified by preparative RP-HPLC (acetonitrile/water gradient with addition of 0.1% TFA). The product fraction was concentrated. The residue was dissolved in dichloromethane and washed twice with saturated aqueous sodium bicarbonate solution. The combined aqueous phases were extracted twice with dichloromethane. The organic phase was dried over sodium sulphate, filtered and concentrated.
Enantiomer A: Yield: 63 mg (99% ee)
Rt=4.32 min [Daicel Chiralpak AY-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 40° C.; detection: 220 nm].
Specific rotation [α](365 nm, 19.9° C.)=+31.8° (c=0.005 g/ml, acetonitrile)
Example 234
ent-N-(2-Amino-2-methylpentyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer B)




195 mg of Example 232 were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak AY-H, 5 μm, 250×20 mm, mobile phase: 60% isohexane, 40% ethanol+0.2% diethylamine, flow rate: 20 ml/min; 25° C., detection: 220 nm]. The product was then re-purified by preparative RP-HPLC (acetonitrile/water gradient with addition of 0.1% TFA). The product fraction was concentrated. The residue was dissolved in dichloromethane and washed twice with saturated aqueous sodium bicarbonate solution. The combined aqueous phases were extracted twice with dichloromethane. The organic phase was dried over sodium sulphate, filtered and concentrated.
Enantiomer B: Yield: 64 mg (89% ee)
Rt=5.09 min [Daicel Chiralpak AY-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 40° C.; detection: 220 nm].
Example 235
rac-8-[(2,6-Difluorobenzyl)oxy]-2,6-dimethyl-N-(1,2,3,4-tetrahydroquinolin-2-ylmethyl)imidazo-[1,2-a]pyridine-3-carboxamide




182 mg (0.32 mmol) of rac-tert-butyl 2-{[({8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]methyl}-3,4-dihydroquinoline-1(2H)-carboxylate Example 240A were initially charged in 5 ml of diethyl ether and 1.58 ml (3.16 mmol) of 2 N hydrochloric acid/diethyl ether and the mixture was stirred at RT overnight. 1 ml (2 mmol) of 2 N hydrochloric acid/diethyl ether was then added, and stirring was continued at RT overnight. The reaction mixture was filtered off and the filter cake was washed with diethyl ether. The solid was taken up in dichloromethane and a very small amount of methanol and washed twice with saturated aqueous sodium bicarbonate solution. The aqueous phase was extracted twice with dichloromethane and the combined organic phases were dried over sodium sulphate. The mixture was filtered, concentrated and dried under high vacuum. This gave 140 mg (91% of theory, purity 98%) of the target compound.
LC-MS (Method 2): Rt=1.01 min
MS (ESIpos): m/z=477 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.55-1.67 (m, 1H), 1.86-1.96 (m, 1H), 2.31 (s, 3H), 2.69 (t, 2H), 3.36-3.50 (m, 3H), 5.28 (s, 2H), 5.72 (s, 1H), 6.43 (t, 1H), 6.48 (d, 1H), 6.82-6.89 (m, 2H), 6.92 (s, 1H), 7.19-7.28 (m, 2H), 7.54-7.64 (m, 1H), 7.91 (t, 1H), 8.46 (s, 1H), [further signal hidden under DMSO peak].
Example 236
rac-N-(2-Amino-3,3,3-trifluoro-2-methylpropyl)-6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide




Preparation and purification of the title compound were carried out analogously to Example 225. Starting with 200 mg (0.57 mmol) of 6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid Example 16A and 111 mg (0.62 mmol) of rac-3,3,3-trifluoro-2-methylpropane-1,2-diamine hydrochloride Example 246A, 211 mg (74% of theory, purity 95%) of the target compound were obtained.
LC-MS (Method 2): Rt=0.98 min
MS (ESIpos): m/z=477 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.23 (s, 3H), 2.55 (s, 3H; superimposed by DMSO signal), 3.47-3.64 (m, 2H), 5.35 (s, 2H), 7.21-7.30 (m, 3H), 7.56-7.67 (m, 1H), 7.92-8.01 (m, 1H), 8.76 (d, 1H).
Example 237
ent-N-(2-Amino-3,3,3-trifluoro-2-methylpropyl)-6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer A) 




204 mg of Example 236 were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak OZ-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% isopropanol+0.2% diethylamine, flow rate: 17 ml/min; 40° C., detection: 210 nm]. The product fractions were collected on dry ice, combined and concentrated on a rotary evaporator (bath temperature 30° C.) to a residual volume of about 30 ml, and about 60 ml of water were added. The solution obtained was frozen and lyophilized.
Enantiomer A: Yield: 50 mg (99% ee)
Rt=9.71 min [Daicel Chiralpak OZ-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% isopropanol+0.2% diethylamine; flow rate 1.0 ml/min; 30° C.; detection: 220 nm].
Example 238
ent-N-(2-Amino-3,3,3-trifluoro-2-methylpropyl)-6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer B)




204 mg of Example 236 were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak OZ-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% isopropanol+0.2% diethylamine, flow rate: 17 ml/min; 40° C., detection: 210 nm]. The product fractions were collected on dry ice, combined and concentrated on a rotary evaporator (bath temperature 30° C.) to a residual volume of about 30 ml, and about 60 ml of water were added. The solution obtained was frozen and lyophilized.
Enantiomer B: Yield: 69 mg (91% ee)
Rt=11.21 min [Daicel Chiralpak OZ-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% isopropanol+0.2% diethylamine; flow rate 1.0 ml/min; 30° C.; detection: 220 nm].
Example 239
rac-N-(2-Amino-3,3,3-trifluoro-2-methylpropyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethyl-imidazo[1,2-a]pyridine-3-carboxamide




118 mg (0.66 mmol) of rac-3,3,3-trifluoro-2-methylpropane-1,2-diamine hydrochloride Example 246A were added to 200 mg (0.60 mmol) of 8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylic acid Example 21A, 203 mg (0.63 mmol) of TBTU and 0.27 ml (2.41 mmol) of 4-methylmorpholine in DMF (2.1 ml), and the reaction mixture was stirred at RT overnight. 50 mg (0.28 mmol) of rac-3,3,3-trifluoro-2-methylpropane-1,2-diamine hydrochloride Example 246A were added to the reaction mixture, and stirring was continued at RT overnight. The mixture was diluted with water/TFA and purified by preparative RP-HPLC (acetonitrile/water gradient with addition of 0.1% TFA). The product fraction was concentrated. Saturated aqueous sodium bicarbonate solution was added to the residue, and the mixture was extracted three times with dichloromethane. The combined organic phases were dried over sodium sulphate, filtered off and concentrated. This gave 219 mg (79% of theory, purity 99%) of the target compound.
LC-MS (Method 2): Rt=0.79 min
MS (ESIpos): m/z=457 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.19 (s, 3H), 2.31 (s, 3H), 2.53 (s, 3H; superimposed by DMDO peak), 3.41-3.49 (m, 1H), 3.53-3.61 (m, 1H), 5.29 (s, 2H), 6.94 (s, 1H), 7.20-7.28 (m, 2H), 7.59 (quintet, 1H), 7.78 (t, 1H), 8.48 (s, 1H).
Example 240
ent-N-(2-Amino-3,3,3-trifluoro-2-methylpropyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo-[1,2-a]pyridine-3-carboxamide (enantiomer A)




210 mg of Example 239 were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralcel OZ-H, 5 μm, 250×20 mm, mobile phase: 25% isohexane, 75% isopropanol; flow rate: 20 ml/min; 23° C., detection: 210 nm]. The product fractions were collected on dry ice, combined and concentrated on a rotary evaporator (bath temperature 30° C.) to a residual volume of about 30 ml, and about 60 ml of water were added. The solution obtained was frozen and lyophilized.
Enantiomer A: Yield: 63 mg (100% ee)
Rt=6.53 min [Daicel Chiralcel OZ-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 30° C.; detection: 220 nm].
Example 241
ent-N-(2-Amino-3,3,3-trifluoro-2-methylpropyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo-[1,2-a]pyridine-3-carboxamide (enantiomer B) 




210 mg of Example 239 were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralcel OZ-H, 5 μm, 250×20 mm, mobile phase: 25% isohexane, 75% isopropanol; flow rate: 20 ml/min; 23° C., detection: 210 nm]. The product fractions were collected on dry ice, combined and concentrated on a rotary evaporator (bath temperature 30° C.) to a residual volume of about 30 ml, and about 60 ml of water were added. The solution obtained was frozen and lyophilized.
Enantiomer B: Yield: 50 mg (92% ee)
Rt=7.07 min [Daicel Chiralcel OZ-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 30° C.; detection: 220 nm].
Example 242
ent-N-(2-Amino-3-methoxypropyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer A) 




100 mg (0.29 mmol, 96% pure) 8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylic acid Example 21A were initially charged in DMF (1.84 ml), 121 mg (0.32 mmol) of HATU and 0.15 ml (0.87 mmol) of N,N-diisopropylethylamine were added and the mixture was stirred at RT for 20 min. 72 mg (0.40 mmol) of ent-3-methoxypropane-1,2-diamine dihydrochloride (enantiomer A) Example 249A were dissolved in 0.48 ml of DMF, 0.30 ml (1.73 mmol) of N,N-diisopropylethylamine were added and the mixture was stirred at RT for 10 min. This solution was then added at −20° C. to the reaction solution prepared beforehand, and the reaction mixture was stirred at RT overnight. The mixture was then diluted with water/TFA and purified by preparative RP-HPLC (acetonitrile/water gradient with addition of 0.1% TFA). The product fraction was concentrated. Dichloromethane/ethyl acetate and saturated aqueous sodium bicarbonate solution were added to the residue. After phase separation, the aqueous phase was extracted twice with dichloromethane. The combined organic phases were washed with saturated aqueous sodium bicarbonate solution, dried over sodium sulphate, filtered off and concentrated. This gave 77 mg (63% of theory, purity 99%) of the target compound.
LC-MS (Method 2): Rt=0.67 min
MS (ESIpos): m/z=419 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=2.31 (s, 3H), 3.09-3.16 (m, 1H), 3.19-3.27 (m, 2H), 3.28 (s, 3H), 3.38-3.44 (m, 2H; superimposed by water signal), 5.28 (s, 2H), 6.92 (s, 1H), 7.18-7.29 (m, 2H), 7.54-7.65 (m, 1H), 7.74 (t, 1H), 8.50 (s, 1H), [further signal under DMSO peak].
Example 243
ent-N-(2-Amino-3-methoxypropyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer B)




Preparation and purification of the title compound were carried out analogously to Example 242. Starting with 100 mg (0.29 mmol, 96% pure) 8-[(2,6-difluorobenzyl)oxy]-2,6-dimethyl-imidazo[1,2-a]pyridine-3-carboxylic acid Example 21A and 72 mg (0.40 mmol) of ent-3-methoxypropane-1,2-diamine dihydrochloride (enantiomer B) Example 250A, 63 mg (51% of theory, purity 99%) of the target compound were obtained.
LC-MS (Method 2): Rt=0.67 min
MS (ESIpos): m/z=419 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.95-2.25 (br. s, 2H), 2.31 (s, 3H), 3.02-3.10 (m, 1H), 3.15-3.25 (m, 2H), 3.27-3.41 (m, 5H; superimposed by water signal), 5.28 (s, 2H), 6.92 (s, 1H), 7.19-7.28 (m, 2H), 7.55-7.64 (m, 1H), 7.72 (t, 1H), 8.49 (s, 1H).
Example 244
rac-N-(2-Amino-2-methylpentyl)-6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide 




191 mg (0.62 mmol) of TBTU and 0.25 ml (2.27 mmol) of 4-methylmorpholine and 72 mg (0.62 mmol) of rac-2-methylpentane-1,2-diamine were added to 200 mg (0.57 mmol) of 6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid Example 16A in DMF (2.0 ml), and the reaction mixture was stirred at RT overnight. 36 mg (0.31 mmol) of rac-2-methylpentane-1,2-diamine and 0.06 ml (0.57 mmol) of 4-methylmorpholine were then added, and stirring was continued at RT overnight. The mixture was diluted with water/TFA and purified by preparative RP-HPLC (acetonitrile/water gradient with addition of 0.1% TFA). The product fraction was concentrated. Saturated aqueous sodium bicarbonate solution was added to the residue, and the mixture was extracted three times with dichloromethane. The combined organic phases were dried over sodium sulphate, filtered off and concentrated. The residue was purified by silica gel chromatography (dichloromethane/methanol: 10:1, then dichloromethane/2N ammonia in methanol 20:1). This gave 189 mg (73% of theory, purity 99%) of the target compound.
LC-MS (Method 2): Rt=0.78 min
MS (ESIpos): m/z=451 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.83-0.89 (m, 3H), 0.99 (s, 3H), 1.22-1.42 (m, 4H), 1.52-1.88 (br. s, 2H), 2.55 (s, 3H; superimposed by DMSO peak), 3.15-3.26 (m, 2H), 5.35 (s, 2H), 7.20 (d, 1H), 7.22-7.29 (m, 2H), 7.56-7.65 (m, 1H), 7.67-7.82 (br. s, 1H), 8.76 (d, 1H).
Example 245
ent-N-(2-Amino-2-methylpentyl)-6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer A) 




182 mg of Example 244 were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak AZ-H, 5 μm, 250×30 mm, mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine, flow rate: 40 ml/min; 25° C., detection: 220 nm]. The product fractions were collected on dry ice, combined and concentrated on a rotary evaporator (bath temperature 30° C.). The product was then purified again by preparative RP-HPLC (acetonitrile/water gradient with addition of 0.1% TFA). The product fraction was concentrated. The residue was dissolved in dichloromethane and washed with saturated aqueous sodium bicarbonate solution. The combined aqueous phases were extracted three times with dichloromethane. The combined organic phases were dried over sodium sulphate, filtered and concentrated.
Enantiomer A: Yield: 30 mg (88% ee)
Rt=7.90 min [Daicel Chiralpak AZ-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 35° C.; detection: 220 nm].
Specific rotation [α](589 nm, 19.7° C.)=−2.6° (c=0.005 g/ml, acetonitrile)
Example 246
ent-N-(2-Amino-2-methylpentyl)-6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer B) 




182 mg of Example 244 were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak AZ-H, 5 μm, 250×30 mm, mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine, flow rate: 40 ml/min; 25° C., detection: 220 nm]. The product fractions were collected on dry ice, combined and concentrated on a rotary evaporator (bath temperature 30° C.). The product was then purified again by preparative RP-HPLC (acetonitrile/water gradient with addition of 0.1% TFA). The product fraction was concentrated. The residue was dissolved in dichloromethane and washed with saturated aqueous sodium bicarbonate solution. The combined aqueous phases were extracted three times with dichloromethane. The combined organic phases were dried over sodium sulphate, filtered and concentrated.
Enantiomer B: Yield: 24 mg (77% ee)
Rt=9.07 min [Daicel Chiralpak AZ-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 35° C.; detection: 220 nm].
Specific rotation [α](589 nm, 19.9° C.)=+2.5° (c=0.0048 g/ml, acetonitrile)
Example 247
ent-N-(2-Amino-3-methoxypropyl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer A) 




Preparation and purification of the title compound were carried out analogously to Example 242. Starting with 100 mg (0.31 mmol) of 8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid Example 3A and 78 mg (0.44 mmol) of ent-3-methoxypropane-1,2-diamine dihydrochloride (enantiomer A) Example 249 A, 76 mg (59% of theory, purity 98%) of the target compound were obtained.
LC-MS (Method 2): Rt=0.62 min
MS (ESIpos): m/z=405 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.57-1.87 (br. s, 2H), 2.53 (s, 3H; superimposed by DMSO peak), 3.00-3.08 (m, 1H), 3.14-3.25 (m, 2H), 3.26-3.42 (m, 5H; superimposed by water signal), 5.30 (s, 2H), 6.93 (t, 1H), 7.01 (d, 1H), 7.19-7.28 (m, 2H), 7.54-7.64 (m, 1H), 7.75 (t, 1H), 8.65 (d, 1H).
Example 248
ent-N-(2-Amino-3-methoxypropyl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer B) 




Preparation and purification of the title compound were carried out analogously to Example 242. Starting with 100 mg (0.31 mmol) of 8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid Example 3A and 78 mg (0.44 mmol) of ent-3-methoxypropane-1,2-diamine dihydrochloride (enantiomer B) Example 250A, 72 mg (56% of theory, purity 99%) of the target compound were obtained.
LC-MS (Method 2): Rt=0.62 min
MS (ESIpos): m/z=405 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.56-1.85 (br. s, 2H), 2.53 (s, 3H; superimposed by DMSO peak), 3.00-3.07 (m, 1H), 3.14-3.26 (m, 2H), 3.26-3.42 (m, 5H; superimposed by water signal), 5.30 (s, 2H), 6.93 (t, 1H), 7.01 (d, 1H), 7.19-7.28 (m, 2H), 7.54-7.64 (m, 1H), 7.75 (t, 1H), 8.66 (d, 1H).
Example 249
rac-N-(2-Amino-2,4-dimethylpentyl)-2,6-dimethyl-8-(3-methylbutoxy)imidazo[1,2-a]pyridine-3-carboxamide 




175 mg (0.63 mmol) of 2,6-dimethyl-8-(3-methylbutoxy)imidazo[1,2-a]pyridine-3-carboxylic acid Example 252A were initially charged in DMF (2.2 ml), 214 mg (0.67 mmol) of TBTU, 0.28 ml (2.53 mmol) of 4-methylmorpholine and 91 mg (0.70 mmol) of rac-2,4-dimethylpentane-1,2-diamine were added and the reaction mixture stirred at RT overnight. The mixture was diluted with water/TFA and purified by preparative RP-HPLC (acetonitrile/water gradient with addition of 0.1% TFA). After concentration, saturated aqueous sodium bicarbonate solution was added to the residue and the mixture was extracted three times with dichloromethane. The combined organic phases were dried over sodium sulphate, filtered off and concentrated. This gave 225 mg (90% of theory, purity 98%) of the target compound.
LC-MS (Method 7): Rt=0.62 min
MS (ESIpos): m/z=389 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.90-0.98 (m, 12H), 1.07 (s, 3H), 1.25-1.38 (m, 2H), 1.65-1.73 (m, 2H), 1.75-1.88 (m, 2H), 2.27 (s, 3H), 2.57 (s, 3H), 3.18-3.29 (m, 2H), 4.15 (t, 2H), 6.71 (s, 1H), 7.66 (t, 1H), 8.42 (s, 1H).
Example 250
rac-8-[(2,6-Difluorobenzyl)oxy]-2-methyl-N-(1,2,3,4-tetrahydroquinolin-2-ylmethyl)imidazo[1,2-a]pyridine-3-carboxamide 




Preparation and purification of the title compound were carried out analogously to Example 235. Starting with 190 mg (0.34 mmol) of rac-tert-butyl 2-{[({8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]methyl}-3,4-dihydroquinoline-1(2H)-carboxylate Example 253A, 149 mg (93% of theory, purity 98%) of the target compound were obtained.
LC-MS (Method 2): Rt=0.99 min
MS (ESIpos): m/z=463 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.56-1.67 (m, 1H), 1.86-1.95 (m, 1H), 2.66-2.73 (m, 2H), 3.37-3.50 (m, 3H), 5.31 (s, 2H), 5.70-5.77 (m, 1H), 6.43 (t, 1H), 6.48 (d, 1H), 6.82-6.89 (m, 2H), 6.95 (t, 1H), 7.03 (d, 1H), 7.20-7.28 (m, 2H), 7.54-7.64 (m, 1H), 7.96 (t, 1H), 8.64 (d, 1H), [further signals under solvent peaks].
Example 251
ent-N-[(1R,2R)-2-Aminocyclohexyl]-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxamide 




Preparation and purification of the title compound were carried out analogously to Example 235. Starting with 107 mg (0.2 mmol, 98% pure) of ent-tert-butyl {(1R,2R)-2-[({8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridin-3-yl}carbonyl)amino]cyclohexyl}-carbamate Example 254A, 83 mg (97% of theory, purity 99%) of the target compound were obtained.
LC-MS (Method 7): Rt=0.59 min
MS (ESIpos): m/z=429 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.08-1.35 (m, 4H), 1.61-1.72 (m, 2H), 1.81-1.89 (m, 1H), 1.90-1.97 (m, 1H), 2.30 (s, 3H), 3.45-3.56 (m, 1H), 5.28 (s, 2H), 6.89 (s, 1H), 7.20-7.28 (m, 2H), 7.54-7.64 (m, 1H), 7.67 (d, 1H), 8.37 (s, 1H), [further signals under solvent peaks].
Example 252
N-(2-Amino-2-ethylbutyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxamide 




70 mg (0.60 mmol) of 2-ethylbutane-1,2-diamine were added to 100 mg (0.30 mmol) of 8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylic acid Example 21A, 145 mg (0.45 mmol) of TBTU and 0.13 ml (1.20 mmol) of 4-methylmorpholine in DMF (1.9 ml), and the reaction mixture was stirred at RT overnight. The mixture was then diluted with water/TFA and purified by preparative RP-HPLC (acetonitrile/water gradient with addition of 0.1% TFA). After concentration, the residue was taken up in dichloromethane and washed twice with saturated aqueous sodium bicarbonate solution. The aqueous phase was extracted twice with dichloromethane. The combined organic phases were dried over sodium sulphate, filtered off, concentrated and lyophilized. This gave 110 mg (85% of theory, purity 100%) of the target compound.
LC-MS (Method 2): Rt=0.60 min
MS (ESIpos): m/z=431 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.82 (t, 6H), 1.22-1.49 (m, 6H), 2.31 (s, 3H), 2.52 (s, 3H; superimposed by DMSO peak), 3.17-3.23 (m, 2H), 5.28 (s, 2H), 6.91 (s, 1H), 7.19-7.28 (m, 2H), 7.51 (t, 1H), 7.55-7.64 (m, 1H), 8.50 (s, 1H).
Example 253
N-(2-Amino-2-ethylbutyl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide 




Preparation and purification of the title compound were carried out analogously to Example 252. Starting with 75 mg (0.24 mmol) of 8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid Example 3A and 41 mg (0.35 mmol) of 2-ethylbutane-1,2-diamine, 73 mg (74% of theory, purity 99%) of the target compound were obtained.
LC-MS (Method 2): Rt=0.64 min
MS (ESIpos): m/z=417 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.83 (t, 6H), 1.26-1.43 (m, 4H), 1.89 (br. s, 2H), 2.56 (s, 3H; superimposed by DMSO signal), 3.20-3.26 (m, 2H), 5.31 (s, 2H), 6.94 (t, 1H), 7.01 (d, 1H), 7.23 (t, 2H), 7.50-7.64 (m, 2H), 8.68 (d, 1H).
Example 254
rac-N-(2-Amino-2-methylbutyl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide 




Preparation and purification of the title compound were carried out analogously to Example 252. Starting with 120 mg (0.38 mmol) of 8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid Example 3A and 58 mg (0.57 mmol) of rac-2-methylbutane-1,2-diamine, 98 mg (63% of theory, purity 98%) of the target compound were obtained.
LC-MS (Method 2): Rt=0.58 min
MS (ESIpos): m/z=403 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.86 (t, 3H), 0.97 (s, 3H), 1.28-1.39 (m, 2H), 1.40-1.49 (br s., 2H), 2.56 (s, 3H; superimposed by DMSO signal), 3.14-3.27 (m, 2H), 5.30 (s, 2H), 6.94 (t, 1H), 7.01 (d, 1H), 7.19-7.27 (m, 2H), 7.54-7.69 (m, 2H), 8.65 (d, 1H).
Example 255
N-[2-(tert-Butylamino)ethyl]-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxamide 




70 mg (0.21 mmol) of 8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylic acid Example 21A, 71 mg (0.22 mmol) of TBTU and 128 mg (1.26 mmol) of 4-methylmorpholine were initially charged in DMF (0.74 ml), 44 mg (0.23 mmol) of N-tert-butylethane-1,2-diamine dihydrochloride were added and the reaction mixture was stirred at RT overnight. Another 22 mg (0.12 mmol) of N-tert-butylethane-1,2-diamine dihydrochloride and 21 mg (0.21 mmol) of 4-methylmorpholine were added, and the mixture was stirred at RT for 1.5 h. The mixture was diluted with a few drops of water/TFA and purified by preparative RP-HPLC (acetonitrile/water with addition of 0.1% TFA), and the product fractions were concentrated. Saturated aqueous sodium bicarbonate solution was added to the residue, and the mixture was extracted three times with dichloromethane. The combined organic phases were dried over sodium sulphate, filtered off and concentrated. This gave 78 mg (86% of theory, purity 96%) of the target compound.
LC-MS (Method 2): Rt=0.66 min
MS (ESIpos): m/z=431 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.18 (br. s, 9H), 2.32 (s, 3H), 2.52 (s, 3H, obscured by DMSO signal), 2.70-3.12 (br. s, 2H), 3.38-3.62 (m, 2H), 5.29 (s, 2H), 6.92 (s, 1H), 7.20-7.27 (m, 2H), 7.59 (quintet, 1H), 7.74 (br. s, 1H), 8.34 (br. s, 1H), 8.53 (s, 1H).
Example 256
ent-N-(2-Amino-2-methylpropyl)-8-[1-(2,6-difluorophenyl)ethoxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer B) 




84 mg (0.24 mmol) of ent-8-[1-(2,6-difluorophenyl)ethoxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylic acid Example 257A were initially charged in DMF (1.54 ml), 117 mg (0.36 mmol) of TBTU, 98 mg (0.97 mmol) of 4-methylmorpholine and 43 mg (0.49 mmol) of 2-methylpropane-1,2-diamine were added and the reaction mixture was stirred at RT overnight. The mixture was then purified by preparative RP-HPLC (acetonitrile/water gradient with addition of 0.1% TFA) and the product fraction was concentrated. The residue was taken up in dichloromethane and washed twice with saturated aqueous sodium bicarbonate solution. The combined organic phases were dried over sodium sulphate, filtered off, and concentrated. The residue was dried under high vacuum and then lyophilized. This gave 85 mg (84% of theory, purity 99%) of the target compound.
LC-MS (Method 13): Rt=1.48 min
MS (ESIpos): m/z=417 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.05 (s, 6H), 1.61-1.74 (m, 2H), 1.78 (d, 3H), 2.18 (s, 3H), 2.57 (s, 3H), 3.19 (d, 2H), 6.20 (q, 1H), 6.56 (s, 1H), 7.06-7.14 (m, 2H), 7.37-7.46 (m, 1H), 7.69 (t, 1H), 8.40 (s, 1H).
Example 257
N-(2-Amino-2-methylpentyl)-8-[1-(2,6-difluorophenyl)ethoxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxamide 




16 mg (0.14 mmol) of rac-2-methylpentane-1,2-diamine were added to 40 mg (0.12 mmol) of ent-8-[1-(2,6-difluorophenyl)ethoxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylic acid Example 257A, 45 mg (0.14 mmol) of TBTU and 47 mg (0.46 mmol) of 4-methylmorpholine in DMF (0.77 ml), and the reaction mixture was stirred at RT overnight. A few drops of water/TFA were added, and the mixture was purified by preparative RP-HPLC (acetonitrile/water gradient with addition of 0.1% TFA). The product fraction was concentrated. The residue was taken up in dichloromethane and washed with saturated aqueous sodium bicarbonate solution. The aqueous phase was extracted three times with dichloromethane and the combined organic phases were dried over sodium sulphate, filtered off, concentrated, dried under high vacuum and then lyophilized. This gave 27.4 mg (52% of theory, purity 97%) of the target compound.
LC-MS (Method 2): Rt=0.71 min
MS (ESIpos): m/z=445 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.87 (t, 3H), 0.98 (s, 3H), 1.22-1.39 (m, 4H), 1.48 (br. s, 2H), 1.78 (d, 3H), 2.19 (s, 3H), 2.57 (s, 3H), 3.13-3.26 (m, 2H), 6.20 (q, 1H), 6.56 (s, 1H), 7.06-7.14 (m, 2H), 7.37-7.44 (m, 1H), 7.58-7.64 (m, 1H), 8.41 (s, 1H).
Example 258
rac-N-(2-Amino-2,4-dimethylpentyl)-2,6-dimethyl-8-[4,4,4-trifluoro-3-(trifluoromethyl)butoxy]-imidazo[1,2-a]pyridine-3-carboxamide 




31 mg (0.08 mmol) of 2,6-dimethyl-8-[4,4,4-trifluoro-3-(trifluoromethyl)butoxy]imidazo[1,2-a]-pyridine-3-carboxylic acid Example 259A, dissolved in 0.3 ml of DMF, 40 mg (0.104 mmol) of HATU, dissolved in 0.3 ml of DMF, and then 16 mg (0.16 mmol) of 4-methylmorpholine were added to 10 mg (0.08 mmol) of rac-2,4-dimethylpentane-1,2-diamine. The mixture was shaken at RT overnight. The target compound was concentrated by preparative HPLC (Method 12). This gave 10 mg (25% of theory).
LC-MS (Method 8): Rt=0.78 min
MS (ESpos): m/z=497 (M+H)+
Example 259
rac-N-(2-Amino-2-cyclopropylpropyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxamide




160 mg (0.48 mmol) of 8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylic acid Example 21A, 162 mg (0.51 mmol) of TBTU and 292 mg (2.89 mmol) of 4-methylmorpholine were initially charged in DMF (1.7 ml), and 99 mg (0.53 mmol) of rac-2-cyclopropylpropane-1,2-diamine dihydrochloride were added at 0° C. The reaction mixture was allowed to warm to room temperature and then stirred at RT overnight. Another 50 mg (0.27 mmol) of 2-cyclopropylpropane-1,2-diamine dihydrochloride and 49 mg (0.48 mmol) of 4-methylmorpholine were added, and the mixture was stirred at RT for 1.5 h. The mixture was diluted with a few drops of water/TFA and purified by prep. RP-HPLC (acetonitrile/water gradient with addition of 0.1% TFA). The product fractions were concentrated. Saturated aqueous sodium bicarbonate solution was added to the residue and the mixture was extracted three times with dichloromethane. The combined organic phases were dried over sodium sulphate, filtered off and concentrated. This gave 156 mg (76% of theory) of the target compound.
LC-MS (Method 2): Rt=0.63 min
MS (ESIpos): m/z=429 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.18-0.38 (m, 4H), 0.79-0.88 (m, 1H), 0.97 (s, 3H), 1.13-1.36 (m, 2H), 2.31 (s, 3H), 2.54 (s, 3H, obscured by DMSO signal), 3.20-3.3.26 (m, 1H), 3.30-3.38 (m, 1H), 5.29 (s, 2H), 6.91 (s, 1H), 7.19-7.27 (m, 2H), 7.54-7.63 (m, 2H), 8.50 (s, 1H).
Example 260
ent-N-(2-Amino-2-cyclopropylpropyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer A)




140 mg of Example 259 were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% isopropanol+0.2% diethylamine, flow rate: 17 ml/min; 40° C., detection: 210 nm].
Enantiomer A: Yield: 48 mg (100% ee)
Rt=8.53 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 40° C.; detection: 220 nm]. Specific rotation [α](365 nm, 20.5° C.)=−8.4° (c=0.005 g/ml, acetonitrile)
Example 261
ent-N-(2-Amino-2-cyclopropylpropyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer B)




140 mg of Example 259 were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralpak AD-H, 5 μm, 250×20 mm, mobile phase: 50% isohexane, 50% isopropanol+0.2% diethylamine; flow rate: 17 ml/min; 40° C., detection: 210 nm].
Enantiomer B: Yield: 38 mg (90% ee)
Rt=9.12 min [Daicel Chiralpak AD-H, 5 μm, 250×4.6 mm; mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 40° C.; detection: 220 nm].
Example 262
rac-N-[2-Amino-4-(benzyloxy)-2-methylbutyl]-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo-[1,2-a]pyridine-3-carboxamide 




503 mg (1.32 mmol) of HATU and 1.05 ml (6.0 mmol) of N,N-diisopropylethylamine in DMF (7.7 ml) were added to 400 mg (1.2 mmol) of 8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylic acid Example 21A, and the mixture was stirred at RT for 20 min. 300 mg (1.38 mmol) of rac-4-(benzyloxy)-2-methylbutane-1,2-diamine Example 261A were dissolved in 2 ml of DMF and, at 0° C., added to the reaction solution. The mixture was stirred at 0° C. for 1 h and then diluted with water/TFA and purified by preparative RP-HPLC (acetonitrile/water gradient with addition of 0.1% strength TFA). This gave 600 mg (88% of theory, purity 93%) of the target compound.
LC-MS (Method 2): Rt=0.78 min
MS (ESIpos): m/z=523 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.30 (s, 3H), 1.87-2.01 (m, 2H), 2.36 (s, 3H), 2.56 (s, 3H), 3.47-3.70 (m, 4H), 4.50 (s, 2H), 5.34 (s, 2H), 7.12-7.38 (m, 8H), 7.55-7.64 (m, 1H), 7.73 (br. s, 2H), 8.08 (br. s, 1H), 8.55 (s, 1H).
The examples shown in Table 14 were prepared analogously to Example 262 by reacting the appropriate carboxylic acids (Example 3A and 21A) with the appropriate amines, prepared as described above or commercially available, (1.05-2.5 equivalents) and N,N-diisopropylethylamine (3-6 equivalents) under the reaction conditions described in the General Working Procedure 3.
Exemplary work-up of the reaction mixture: Water was added to the reaction solution and the mixture was extracted three times with ethyl acetate or dichloromethane. The combined organic phases were dried over sodium sulphate, filtered, concentrated and purified by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). Alternatively, the precipitate or the reaction mixture was directly purified further by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA) and dried under high vacuum overnight. If appropriate, the product fractions were taken up in ethyl acetate or dichloromethane and washed twice with saturated aqueous sodium bicarbonate solution. The aqueous phase was extracted twice with ethyl acetate or dichloromethane and the combined organic phases were dried over sodium sulphate, filtered and concentrated.









TABLE 14





Exam-
IUPAC name/structure



ple
(yield)
Analytical data







263
rac-N-[2-amino-3-(benzyloxy)-2-methylpropyl]- 8-[(2,6-difluorobenzyl)oxy]-2- methylimidazo[1,2-a]pyridine-3-carboxamide   


   (81% of theory)
LC-MS (Method 2): Rt = 0.74 min MS (ESpos): m/z = 495.3 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ =  1.03 (s, 3 H), 1.66 (br. s, 2 H), 2.49 (s, 3 H), 3.28-3.38 (m, 2 H; superimposed by water signal), 4.51 (s, 2 H), 5.30 (s, 2 H), 6.92 (t, 1 H), 7.01 (d, 1 H), 7.19-7.37 (m, 7 H), 7.50- 7.67 (m, 2 H), 8.69 (d, 1 H).


 


264
rac-N-[2-amino-4-(benzyloxy)-2-methylbutyl]-8-  [(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2- a]pyridine-3-carboxamide   


   (81% of theory)
LC-MS (Method 2): Rt = 0.77 min MS (ESpos): m/z = 509.1 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ =  1.11 (s, 3 H), 1.74 (t, 2 H), 2.51 (s, 3 H; superimposed by DMSO peak), 3.28-3.38 (m, 2 H; superimposed by water signal), 3.59-3.67 (m, 2 H), 4.47 (s, 2 H), 5.31 (s, 2 H), 6.93 (t, 1 H), 7.02 (d, 1 H), 7.19-7.38 (m, 7 H), 7.54-7.71 (m, 2 H), 8.68 (d, 1 H).


 


265
rac-N-[2-amino-3-(benzyloxy)-2-methylpropyl]- 8-[(2,6-difluorobenzyl)oxy]-2,6- dimethylimidazo[1,2-a]pyridine-3-carboxamide   


   (74% of theory)
LC-MS (Method 2): Rt = 0.80 min MS (ESpos): m/z = 509.1 (M + H)+ 1H NMR (400 MHz, DMSO-d6): δ =  1.05 (s, 3 H), 2.30 (s, 3 H), 2.49 (s, 3 H), 3.30-3.38 (m, 2 H; superimposed by water signal), 4.52 (s, 2 H), 5.30 (s, 2 H), 6.91 (s, 1 H), 7.19-7.38 (m, 8 H), 7.52-7.65 (m, 2 H), 8.51 (s, 1 H).









Example 266
ent-N-[2-Amino-4-(benzyloxy)-2-methylbutyl]-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer A)




637 mg of Example 264 were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralcel OD-H, 5 μm, 250×20 mm, mobile phase: 100% ethanol+0.2% diethylamine, flow rate: 15 ml/min; 40° C., detection: 220 nm].
Enantiomer A: Yield: 267 mg (99% ee)
Rt=5.45 min [Daicel Chiralcel OD-H, 5 μm, 250×4.6 mm; mobile phase: 100% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 40° C.; detection: 220 nm].
Example 267
ent-N-[2-Amino-4-(benzyloxy)-2-methylbutyl]-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer B)




637 mg of Example 264 were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralcel OD-H, 5 μm, 250×20 mm, mobile phase: 100% ethanol+0.2% diethylamine, flow rate: 15 ml/min; 40° C., detection: 220 nm].
Enantiomer B: Yield: 292 mg (99% ee)
Rt=7.10 min [Daicel Chiralcel OD-H, 5 μm, 250×4.6 mm; mobile phase: 100% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 40° C.; detection: 220 nm].
Example 268
ent-N-(2-Amino-3-hydroxy-2-methylpropyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo-[1,2-a]pyridine-3-carboxamide (enantiomer A) 




460 mg of Example 265 were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralcel OZ-H, 5 μm, 250×20 mm, mobile phase: 100% ethanol+0.2% diethylamine, flow rate: 15 ml/min; 40° C., detection: 220 nm]. The product fractions were collected on dry ice, combined and concentrated on a rotary evaporator (bath temperature 30° C.) to a residual volume of about 15 ml, and about 60 ml of water were added. The solution obtained was frozen and lyophilized.
Yield of the intermediate ent-N-[(2R)-2-amino-3-(benzyloxy)-2-methylpropyl]-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer A):
183 mg (99% ee).
Rt=6.61 min [Daicel Chiralcel OZ-H, 5 μm, 250×4.6 mm; mobile phase: 100% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 40° C.; detection: 235 nm].
Under argon, 183 mg (0.36 mmol) of ent-N-[(2R)-2-amino-3-(benzyloxy)-2-methylpropyl]-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer A) were initially charged in 3.7 ml of ethanol, and 38.3 mg of palladium on activated carbon (10%) and 1.09 ml (10.8 mmol) of cyclohexene were added. The reaction mixture was stirred under reflux for 6 h. The reaction mixture was directly applied to Celite and purified by silica gel chromatography (mobile phase: dichloromethane/methanol 10/1, dichloromethane/2N ammonia in methanol 10/1). This gave 80 mg of the target compound (52% of theory; purity 98%).
LC-MS (Method 2): Rt=0.61 min
MS (ESIpos): m/z=419 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.97 (s, 3H), 1.92 (br. s, 2H), 2.31 (s, 3H), 2.54 (s, 3H, obscured by DMSO signal), 3.15-3.32 (m, 4H), 4.73-4.82 (m, 1H), 5.28 (s, 2H), 6.92 (s, 1H), 7.22 (t, 2H), 7.53-7.66 (m, 2H), 8.51 (s, 1H).
Example 269
ent-N-(2-Amino-3-hydroxy-2-methylpropyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo-[1,2-a]pyridine-3-carboxamide (enantiomer B)




460 mg of Example 265 were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralcel OZ-H, 5 μm, 250×20 mm, mobile phase: 100% ethanol+0.2% diethylamine, flow rate: 15 ml/min; 40° C., detection: 220 nm]. The product fractions were collected on dry ice, combined and concentrated on a rotary evaporator (bath temperature 30° C.) to a residual volume of about 15 ml, and about 60 ml of water were added. The solution obtained was frozen and lyophilized.
Yield of the intermediate ent-N-[(2R)-2-amino-3-(benzyloxy)-2-methylpropyl]-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer B):
189 mg (99% ee).
Rt=8.47 min [Daicel Chiralcel OZ-H, 5 μm, 250×4.6 mm; mobile phase: 100% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 40° C.; detection: 235 nm].
Under argon, 189 mg (0.37 mmol) of ent-N-[(2R)-2-amino-3-(benzyloxy)-2-methylpropyl]-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer B) were initially charged in 3.8 ml of ethanol, and 39.5 mg of palladium on activated carbon (10%) and 1.13 ml (11.2 mmol) of cyclohexene were added. The reaction mixture was stirred under reflux for 12 h. The reaction mixture was applied directly to Celite and purified by silica gel chromatography (mobile phase: dichloromethane/methanol 10/1, dichloromethane/2N ammonia in methanol 10/1). This gave 85 mg of the target compound (54% of theory; purity 98%).
LC-MS (Method 2): Rt=0.52 min
MS (ESIpos): m/z=419 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.97 (s, 3H), 1.83 (br. s, 2H), 2.30 (s, 3H), 2.54 (s, 3H, obscured by DMSO signal), 3.15-3.32 (m, 4H), 4.73-4.82 (m, 1H), 5.28 (s, 2H), 6.91 (s, 1H), 7.22 (t, 2H), 7.53-7.66 (m, 2H), 8.51 (s, 1H).
Example 270
rac-N-(2-Amino-4-hydroxy-2-methylbutyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxamide




Under argon, 295 mg (0.52 mmol) of rac-N-[2-amino-4-(benzyloxy)-2-methylbutyl]-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxamide Example 262 were initially charged in 5.4 ml of ethanol, 56 mg of Pd/carbon (10%) were added and the mixture was hydrogenated under atmospheric pressure at room temperature for 6.5 h. The reaction mixture was left under hydrogen overnight. The reaction mixture was applied to silica gel, concentrated and purified by silica gel chromatography (mobile phase: dichloromethane/2N ammonia in methanol 10/1 isocratic). This gave 95 mg of the target compound (42% of theory).
LC-MS (Method 2): Rt=0.70 min
MS (ESIpos): m/z=433 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.07 (s, 3H), 1.49-1.68 (m, 2H), 2.31 (s, 3H), 2.54 (s, 3H, obscured by DMSO signal), 3.26 (br. s, 2H), 3.51-3.68 (m, 2H), 5.28 (s, 2H), 6.91 (s, 1H), 7.22 (t, 2H), 7.53-7.70 (m, 2H), 8.50 (s, 1H).
Example 271
ent-N-(2-Amino-4-hydroxy-2-methylbutyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer A) 




187 mg of Example 270 were separated into the enantiomers by preparative separation on a chiral phase [column: Daicel Chiralcel OZ-H, 5 μm, 250×20 mm; mobile phase: 50% isohexane, 50% ethanol+0.2% diethylamine; flow rate: 15 ml/min; 40° C.; detection: 220 nm]. The product fractions were collected on dry ice, combined and concentrated on a rotary evaporator (bath temperature 30° C.) to a residual volume of about 15 ml, and about 60 ml of water were added. The solution obtained was frozen and lyophilized.
Enantiomer A: Yield: 63 mg (99% ee)
Rt=5.57 min [Daicel Chiralcel OZ-H, 5 μm, 250×4.6 mm; mobile phase: 100% ethanol+0.2% diethylamine; flow rate 1.0 ml/min; 40° C.; detection: 235 nm].
Specific rotation [α](365 nm, 20.2° C.)=−8.3° (c=0.005 g/ml, acetonitrile)
Example 272
ent-N-(2-Amino-4-hydroxy-2-methylbutyl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer A)




Under argon, 257 mg (0.51 mmol) of ent-N-[2-amino-4-(benzyloxy)-2-methylbutyl]-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer A) Example 266 were initially charged in 5.2 ml of ethanol, and 54 mg of palladium on activated carbon (10%) and 1.54 ml (15.2 mmol) of cyclohexene were added. The reaction mixture was stirred under reflux for 6.5 h and then applied to Celite and purified by silica gel chromatography (mobile phase: dichloromethane/2N ammonia in methanol 20/1). This gave 122 mg of the target compound (56% of theory; purity 98%).
LC-MS (Method 2): Rt=0.60 min
MS (ESIpos): m/z=419 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=1.03 (s, 3H), 1.46-1.62 (m, 2H), 1.71 (br. s, 2H), 2.55 (s, 3H, obscured by DMSO signal), 3.19-3.28 (m, 2H), 3.52-3.68 (m, 2H), 4.75 (br. s, 1H), 5.30 (s, 2H), 6.92 (t, 1H), 7.00 (d, 1H), 7.22 (t, 2H), 7.59 (quintet, 1H), 7.63-7.73 (m, 1H), 8.67 (d, 1H).
Example 273
rac-N-(2-Amino-3-hydroxy-2-methylpropyl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide




Under argon, 800 mg (1.57 mmol) of rac-N-[2-amino-3-(benzyloxy)-2-methylpropyl]-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide Example 263 were initially charged in 16.2 ml of ethanol, and 167 mg of palladium on activated carbon (10%) and 4.77 ml (47.1 mmol) of cyclohexene were added. The reaction mixture was stirred under reflux for 18 h and then applied to Celite and purified by silica gel chromatography (mobile phase: dichloromethane/methanol 10/1, dichloromethane/2N ammonia in methanol 10/1). This gave 366 mg of the target compound (56% of theory; purity 97%).
LC-MS (Method 2): Rt=0.54 min
MS (ESIpos): m/z=405 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.96 (s, 3H), 1.79 (br. s, 2H), 2.56 (s, 3H, superimposed by DMSO signal), 3.19-3.33 (m, 4H; superimposed by water signal), 4.74-4.80 (m, 1H), 5.30 (s, 2H), 6.92 (t, 1H), 7.01 (d, 1H), 7.22 (t, 2H), 7.55-7.69 (m, 2H), 8.69 (d, 1H).
Example 274
ent-N-(2-Amino-2-methylbutyl)-2,6-dimethyl-8-[(2,3,6-trifluorobenzyl)oxy]imidazo[1,2-a]-pyridine-3-carboxamide (enantiomer A)




Under argon, 383 mg (0.56 mmol) of ent-benzyl {1-[({2,6-dimethyl-8-[(2,3,6-trifluorobenzyl)oxy]imidazo[1,2-a]pyridin-3-yl}carbonyl)amino]-2-methylbutan-2-yl}carbamate trifluoroacetate (enantiomer A) Example 278A were initially charged in 5.75 ml of ethanol, and 39 mg of palladium(II) hydroxide on activated carbon (20%) were added. The reaction mixture was hydrogenated at standard pressure at RT for 2 h, applied to Celite and purified by silica gel chromatography (mobile phase: dichloromethane/2 N ammonia in methanol=40/1). This gave 208 mg of the target compound (85% of theory).
LC-MS (Method 2): Rt=0.62 min
MS (ESIpos): m/z=435 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.86 (t, 3H), 0.97 (s, 3H), 1.31-1.39 (m, 2H), 1.42 (br. s, 2H), 2.31 (s, 3H), 2.53 (s, 3H, superimposed by DMSO signal), 3.14-3.26 (m, 2H), 5.34 (s, 2H), 6.92 (s, 1H), 7.25-7.34 (m, 1H), 7.58-7.72 (m, 2H), 8.49 (s, 1H).
Example 275
ent-N-(2-Amino-2-methylbutyl)-2,6-dimethyl-8-[(2,3,6-trifluorobenzyl)oxy]imidazo[1,2-a]-pyridine-3-carboxamide (enantiomer B)




Under argon, 200 mg (0.29 mmol) of ent-benzyl {1-[({2,6-dimethyl-8-[(2,3,6-trifluorobenzyl)oxy]imidazo[1,2-a]pyridin-3-yl}carbonyl)amino]-2-methylbutan-2-yl}carbamate trifluoroacetate (enantiomer B) Example 279A were initially charged in 3.0 ml of ethanol, and 10.3 mg of palladium(II) hydroxide on activated carbon (20%) were added. The reaction mixture was hydrogenated under atmospheric pressure at RT for 6 h. Another 10.3 mg of palladium(II) hydroxide on activated carbon (20%) were added, and the mixture was hydrogenated under atmospheric pressure at RT for 1 h. The reaction mixture was applied to Celite and purified by silica gel chromatography (mobile phase: dichloromethane/2 N ammonia in methanol=40/1). This gave 92 mg of the target compound (72% of theory).
LC-MS (Method 2): Rt=0.66 min
MS (ESIpos): m/z=435 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.87 (t, 3H), 0.98 (s, 3H), 1.32-1.41 (m, 2H), 1.81 (br. s, 2H), 2.31 (s, 3H), 2.54 (s, 3H, superimposed by DMSO signal), 3.15-3.28 (m, 2H), 5.34 (s, 2H), 6.92 (s, 1H), 7.25-7.34 (m, 1H), 7.59-7.73 (m, 2H), 8.49 (s, 1H).
Example 276
N-(2-Amino-2-methylpropyl)-2,6-dimethyl-8-[(2,3,6-trifluorobenzyl)oxy]imidazo[1,2-a]pyridine-3-carboxamide 




70 mg (0.20 mmol) of 2,6-dimethyl-8-[(2,3,6-trifluorobenzyl)oxy]imidazo[1,2-a]pyridine-3-carboxylic acid Example 265A, 84 mg (0.22 mmol) of O-(7-azabenzotriazol-1-yl)-N,N,N′N′-tetramethyluronium hexafluorophosphate (HATU) and 77 mg (0.60 mmol) of N,N-diisopropylethylamine were dissolved in 1.3 ml of DMF, and after 20 min at 0° C., 19.4 mg (0.22 mmol) of 2-methylpropane-1,2-diamine were added. The mixture was stirred at 0° C. for 45 min and then purified by preparative HPLC (method: RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). The product fraction obtained was taken up in dichloromethane and washed twice with saturated aqueous sodium bicarbonate solution. The aqueous phase was extracted twice with dichloromethane. The combined organic phases were dried over sodium sulphate, filtered, concentrated and lyophilized. This gave 54 mg (64% of theory) of the title compound.
LC-MS (Method 2): Rt=0.65 min
MS (ESpos): m/z=421 (M+H)+
1H NMR (500 MHz, DMSO-d6): δ=1.05 (s, 6H), 1.93 (br. s, 2H), 2.30 (s, 3H), 2.54 (s, 3H; superimposed by DMSO peak), 3.21 (d, 2H), 5.32 (s, 2H), 6.92 (s, 1H), 7.27-7.32 (m, 1H), 7.62-7.74 (m, 2H), 8.48 (s, 1H).
Example 277
rac-N-(2-Amino-2-methylpentyl)-8-[(2,6-difluorobenzyl)oxy]-7-fluoro-2-methylimidazo[1,2-a]-pyridine-3-carboxamide 




50 mg (0.15 mmol) of 8-[(2,6-difluorobenzyl)oxy]-7-fluoro-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid Example 270A, 62 mg (0.16 mmol) of O-(7-azabenzotriazol-1-yl)-N,N,N′N′-tetramethyluronium hexafluorophosphate (HATU) and 58 mg (0.45 mmol) of N,N-diisopropylethylamine were dissolved in 1.0 ml of DMF, and after 20 min at 0° C., 21.4 mg (0.18 mmol) of 2-methylpentane-1,2-diamine were added. The mixture was stirred at 0° C. for 1.5 h, acetonitrile/TFA were added and the mixture was purified by preparative HPLC (method: RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). The product fraction obtained was taken up in dichloromethane and washed with saturated aqueous sodium bicarbonate solution. The aqueous phase was extracted twice with dichloromethane. The combined organic phases were dried over sodium sulphate, filtered, concentrated and lyophilized. This gave 31 mg (45% of theory; purity 94%) of the title compound.
LC-MS (Method 2): Rt=0.77 min
MS (ESpos): m/z=435 (M+H)+
1H NMR (400 MHz, DMSO-d6): δ=0.83-0.92 (m, 3H), 1.02 (s, 3H), 1.26-1.43 (m, 4H), 1.87 (br. s, 2H), 2.63 (s, 3H), 3.15-3.30 (m, 2H), 5.60 (s, 2H), 6.97-7.06 (m, 1H), 7.08-7.18 (m, 2H), 7.51 (quintet, 1H), 7.64-7.78 (m, 1H), 8.77 (dd, 1H).
B. ASSESSMENT OF THE PHARMACOLOGICAL ACTIVITY
The following abbreviations are used:
ATP adenosine triphosphate
Brij35 polyoxyethylene (23) lauryl ether
BSA bovine serum albumin
DTT dithiothreitol
TEA triethanolamine
The pharmacological effect of the compounds according to the invention can be shown in the following assays:
B-1. Measurement of sGC Enzyme Activity by Detection of PPi
Soluble guanylate cyclase (sGC) converts on stimulation GTP into cGMP and pyrophosphate (PPi). PPi is detected with the aid of the method described in WO 2008/061626. The signal produced in the test increases as the reaction progresses and serves as a measure of the sGC enzyme activity. With the aid of a PPi reference curve, the enzyme can be characterized in a known manner, for example with respect to conversion rate, stimulability or Michaelis constant.
Practice of the Test
To carry out the test, 29 μl of enzyme solution (0-10 nM soluble guanylate cyclase (prepared according to Honicka et al., Journal of Molecular Medicine 77 (1999) 14-23) in 50 mM TEA, 2 mM magnesium chloride, 0.1% BSA (fractionV), 0.005% Brij 35, pH 7.5) were initially introduced into the microplate, and 1 μl of the stimulator solution (0-10 μM 3-morpholinosydnonimine, SIN-1, Merck in DMSO) were added. The mixture was incubated at RT for 10 min. 20 μM of detection mix (1.2 nM Firefly Luciferase (Photinus pyralis Luziferase, Promega), 29 μM dehydroluciferin (prepared according to Bitler & McElroy, Arch. Biochem. Biophys. 72 (1957) 358), 122 μM luciferin (Promega), 153 μM ATP (Sigma) and 0.4 mM DTT (Sigma) in 50 mM TEA, 2 mM magnesium chloride, 0.1% BSA (fraction V), 0.005% Brij 35, pH 7.5) were added. The enzyme reaction was started by addion of 20 μl of substrate solution (1.25 mM guanosine 5′-triphosphate (Sigma) in 50 mM TEA, 2 mM magnesium chloride, 0.1% BSA (fraction V), 0.005% Brij 35, pH 7.5) and measured continuously in a luminometer.
B-2. Action on Recombinant Guanylate Cyclase Reporter Cell Line
The cellular action of the compounds according to the invention is determined on a recombinant guanylate cyclase reporter cell line, as described in F. Wunder et al., Anal. Biochem. 339, 104-112 (2005).
Representative MEC values (MEC=minimal effective concentration) for the compounds according to the invention are shown in the following table (in some cases as mean values obtained from individual determinations):










TABLE A







Example
MEC [μM]



















1
0.10



2
0.65



3
0.30



4
0.30



5
1.00



6
0.23



7
1.00



8
0.10



9
0.30



10
0.30



11
0.30



12
1.00



13
0.23



14
1.00



15
0.53



16
0.30



17
1.00



18
0.55



19
1.66



20
1.00



21
0.30



22
0.30



23
0.30



24
0.65



25
1.00



26
0.30



27
1.00



28
0.30



29
0.20



30
0.30



31
0.30



32
0.30



33
0.30



34
1.00



35
1.00



36
1.00



37
1.00



38
0.40



39
0.10



40
0.10



41
0.30



42
1.00



43
1.00



44
0.30



45
1.00



46
1.00



47
0.30



48
1.00



49
0.30



50
0.03



51
0.20



52
0.03



53
0.30



54
1.00



55
2.00



56
1.00



57
0.30



58
1.00



59
3.00



60
0.30



61
3.00



62
1.00



63
0.30



64
0.30



65
1.00



66
1.00



67
0.30



68
0.30



69
1.00



70
1.00



71
0.30



72
0.30



73
0.30



74
0.20



75
1.00



76
0.30



77
1.00



78
1.00



79
1.00



80
1.00



81
1.00



82
0.20



83
0.10



84
1.00



85
1.00



86
2.00



87
1.00



88
1.00



89
0.65



90
0.10



91
1.00



92
0.30



93
0.30



94
0.30



95
1.00



96
1.00



97
0.10



98
1.00



99
1.00



100
0.30



101
1.00



102
1.00



103
3.00



104
0.30



105
0.30



106
0.03



107
0.30



108
1.00



109
1.00



110
0.30



111
1.00



112
0.10



113
0.65



114
0.30



115
1.00



116
3.00



117
1.00



118
1.00



119
0.10



120
0.30



121
0.30



122
1.00



123
3.00



124
1.00



125
1.00



126
0.30



127
1.00



128
0.10



129
0.10



130
1.00



131
3.00



132
1.00



133
3.00



134
3.00



135
1.00



136
0.10



137
1.00



138
0.30



139
1.00



140
1.00



141
3.00



142
1.00



143
0.30



144
3.00



145
3.00



146
1.00



147
0.30



148
1.00



149
1.00



150
0.10



151
0.10



152
1.00



153
1.00



154
1.00



155
0.30



156
3.00



157
0.30



158
0.30



159
0.30



160
1.00



161
0.10



162
3.00



163
0.30



164
0.10



165
0.10



166
0.30



167
1.00



168
1.00



169
1.65



170
3.00



171
1.00



172
0.30



173
0.30



174
0.30



175
1.00



176
1.00



177
1.00



178
0.30



179
1.00



180
1.00



181
1.00



182
3.00



183
1.00



184
1.00



185
1.00



186
0.30



187
0.30



188
1.00



189
3.00



190
1.00



191
1.00



192
0.30



193
1.00



194
0.10



195
0.30



196
1.00



197
1.00



198
0.30



199
0.30



200
0.04



201
0.10



202
0.10



203
0.10



204
1.00



205
0.30



206
0.30



207
1.00



208
0.30



209
0.30



210
0.30



211
0.30



212
1.00



213
1.00



214
0.30



215
1.00



216
1.00



217
1.00



218
0.10



219
0.30



220
0.10



221
0.30



222
0.30



223
0.30



224
0.30



225
0.30



226
0.10



227
0.30



228
1.00



229
1.00



230
1.00



231
0.30



232
0.10



233
0.10



234
0.03



235
0.30



236
0.30



237
0.30



238
1.00



239
0.30



240
0.30



241
0.30



242
0.30



243
1.00



244
0.30



245
0.10



246
0.30



247
3.00



248
1.00



249
1.00



250
1.00



251
3.00



252
0.10



253
0.10



254
0.30



255
0.30



256
3.00



257
1.00



258
1.00



259
0.03



260
0.10



261
0.10



262
0.10



263
1.00



264
0.03



265
0.30



266
0.03



267
0.10



268
0.55



269
0.65



270
1.00



271
0.30



272
5.5



273
1.00



274
0.10



275
0.10



276
0.10



277
1.00










B-3. Vessel-Relaxing Action In Vitro

Rabbits are stunned with a blow on the back of the neck and exsanguinated. The aorta is removed, freed from adhering tissue, separated into rings with a width of 1.5 mm, and placed individually, with preloading, in 5-ml organ baths with carbogen-gassed Krebs-Henseleit solution at 37° C. with the following composition (mM in each case): sodium chloride: 119; potassium chloride: 4.8; calcium chloride dihydrate: 1; magnesium sulphate heptahydrate: 1.4; potassium dihydrogen phosphate: 1.2; sodium hydrogen carbonate: 25; glucose: 10. The contraction force is recorded with Statham UC2 cells, amplified and digitized via an A/D converter (DAS-1802 HC, Keithley Instruments Munich) and recorded in parallel on a continuous-line recorder. To produce contraction, phenylephrine is added to the bath cumulatively in increasing concentration. After several control cycles, the test substance is added in increasing dosage in each subsequent pass and the level of contraction is compared with the level of contraction reached in the immediately preceding pass. This is used for calculating the concentration that is required to reduce the level of the control value by 50% (IC50 value). The standard application volume is 5 μl, and the proportion of DMSO in the bath solution corresponds to 0.1%.
B-4. Measurement of Blood Pressure on Anaesthetized Rats
Male Wistar rats having a body weight of 300-350 g are anaesthetized with thiopental (100 mg/kg i.p.). After tracheotomy, a catheter for measuring the blood pressure is introduced into the femoral artery. The substances to be tested are administered as solutions either orally by gavage or intravenously via the femoral vein (Stasch et al. Br. J. Pharmacol. 2002; 135: 344-355).
B-5. Radiotelemetric Blood Pressure Measurement on Awake, Spontaneously Hypertensive Rats
The blood pressure measurement on awake rats described below uses a commercially available telemetry system from the company DATA SCIENCES INTERNATIONAL DSI, USA.
The system consists of 3 main components:
implantable transmitter (Physiotel® Telemetry Transmitter)
receiver (Physiotel® Receiver), which are connected via a multiplexer (DSI Data Exchange Matrix) to a
data acquisition computer.
The telemetry system provides continuous acquisition of blood pressure, heart rate and body movement on awake animals in their usual living space.
Animal Material
The investigations are carried out on adult female, spontaneously hypertensive rats (SHR Okamoto) with a body weight of >200 g. SHR/NCrl from Okamoto Kyoto School of Medicine, 1963 were crossed from male Wistar Kyoto rats with greatly increased blood pressure and females with slightly raised blood pressure and were delivered in F13 to the U.S. National Institutes of Health.
After transmitter implantation, the experimental animals are kept individually in Makrolon cages, type 3. They have free access to standard feed and water.
The day-night rhythm in the testing laboratory is alternated by the room lighting at 06:00 hours in the morning and at 19:00 hours in the evening.
Transmitter Implantation
The TA11 PA-C40 telemetry transmitters used are implanted surgically in the experimental animals under aseptic conditions at least 14 days before the first test. The animals provided with this instrumentation can be used again after the wound has healed and the implant has become incorporated.
For implantation, the fasting animals are anaesthetized with pentobarbital (Nembutal, Sanofi: 50 mg/kg i.p.) and are shaved and disinfected on a wide area of the abdomen. After opening the abdominal cavity along the linea alba, the liquid-filled measuring catheter of the system is inserted above the bifurcation in the cranial direction into the aorta descendens and secured with tissue adhesive (VetBonDTM, 3M). The transmitter housing is fixed intraperitoneally on the abdominal wall musculature and the wound is closed layer by layer.
Postoperatively, an antibiotic is administered to prevent infection (Tardomyocel COMP Bayer 1 ml/kg s.c.)
Substances and Solutions
Unless described otherwise, the test substances are in each case administered orally by stomach tube to a group of animals (n=6). Corresponding to an application volume of 5 ml/kg body weight, the test substances are dissolved in suitable solvent mixtures or suspended in 0.5% Tylose.
A group of animals treated with solvents is used as control.
Test Procedure
The present telemetry measuring device is configured for 24 animals. Each test is recorded under a test number (Vtest year month day).
The instrumented rats living in the unit are each assigned their own receiving antenna (1010 Receiver, DSI).
The implanted transmitters can be activated from outside by an in-built magnetic switch. They are switched to transmission at the start of the tests. The signals emitted can be recorded online by a data acquisition system (DataquestTM A.R.T. for WINDOWS, DSI) and processed appropriately. The data are saved in each case to a folder opened for this, which bears the test number.
In the standard procedure, the following are measured, in each case for 10 seconds:
systolic blood pressure (SBP)
diastolic blood pressure (DBP)
mean arterial pressure (MAP)
heart rate (HR)
activity (ACT).
Recording of the measured values is repeated at 5-minute intervals under computer control. The source data recorded as absolute value are corrected in the diagram with the currently measured barometric pressure (Ambient Pressure Reference Monitor; APR-1) and saved in individual data. Further technical details can be found in the extensive documentation of the manufacturer (DSI).
Unless described otherwise, the test substances are administered on the test day at 09.00 hours. Following application, the parameters described above are measured for 24 hours.
Evaluation
After the end of the test, the individual data recorded are sorted with the analysis software (DATAQUESTTM A.R.T.TM ANALYSIS). The 2 hours before application are taken as the blank value here, so that the selected data set comprises the period from 07:00 hours on the test day to 09:00 hours on the next day.
The data are smoothed for a pre-settable time by mean value determination (15-minute average) and transferred as text file to a storage medium. The pre-sorted and compressed measured values are transferred to Excel templates and presented as tables. The data recorded are saved per test day in a specific folder, which bears the test number. Results and test protocols are filed in folders, sorted in paper form by numbers.
Literature
Klaus Witte, Kai Hu, Johanna Swiatek, Claudia Müssig, Georg Ertl and Björn Lemmer Experimental heart failure in rats: effects on cardiovascular circadian rhythms and on myocardial β-adrenergic signaling. Cardiovasc Res 47 (2): 203-405, 2000; Kozo Okamoto: Spontaneous hypertension in rats. Int Rev Exp Pathol 7: 227-270, 1969; Maarten van den Buuse: Circadian Rhythms of Blood Pressure, Heart Rate, and Locomotor Activity in Spontaneously Hypertensive Rats as Measured with Radio-Telemetry. Physiology & Behavior 55(4): 783-787, 1994.
C. EXEMPLARY EMBODIMENTS OF PHARMACEUTICAL COMPOSITIONS
The compounds according to the invention can be converted into pharmaceutical preparations in the following ways:
Tablet:
Composition:
100 mg of the compound according to the invention, 50 mg of lactose (monohydrate), 50 mg of maize starch (native), 10 mg of polyvinylpyrrolidone (PVP 25) (from BASF, Ludwigshafen, Germany) and 2 mg of magnesium stearate.
Tablet weight 212 mg, diameter 8 mm, radius of curvature 12 mm.
Production:
The mixture of compound according to the invention, lactose and starch is granulated with a 5% strength solution (m/m) of the PVP in water. The granules are dried and then mixed with the magnesium stearate for 5 minutes. This mixture is compressed in a conventional tablet press (see above for format of the tablet). A guideline compressive force for the compression is 15 kN.
Suspension which can be Administered Orally:
Composition:
1000 mg of the compound according to the invention, 1000 mg of ethanol (96%), 400 mg of Rhodigel® (xanthan gum from FMC, Pennsylvania, USA) and 99 g of water.
10 ml of oral suspension correspond to a single dose of 100 mg of the compound according to the invention.
Production:
The Rhodigel is suspended in ethanol, and the compound according to the invention is added to the suspension. The water is added while stirring. The mixture is stirred for about 6 h until the swelling of the Rhodigel is complete.
Solution which can be Administered Orally:
Composition:
500 mg of the compound according to the invention, 2.5 g of polysorbate and 97 g of polyethylene glycol 400.20 g of oral solution correspond to a single dose of 100 mg of the compound according to the invention.
Production:
The compound according to the invention is suspended in the mixture of polyethylene glycol and polysorbate with stirring. The stirring process is continued until the compound according to the invention has completely dissolved.
i.v. solution:
The compound according to the invention is dissolved in a concentration below the saturation solubility in a physiologically tolerated solvent (e.g. isotonic saline, 5% glucose solution and/or 30% PEG 400 solution). The solution obtained is sterilized by filtration and used to fill sterile and pyrogen-free injection containers.

## Claims

1. A compound of formula (I)




in which
A represents CH2, CD2 or CH(CH3),
R1 represents (C4-C6)-alkyl, (C3-C7)-cycloalkyl or phenyl,
where (C4-C6)-alkyl may be substituted up to six times by fluorine,
where (C3-C7)-cycloalkyl may be substituted by 1 to 4 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl and (C1-C4)-alkyl,
and
where phenyl may be substituted by 1 to 4 substituents independently of one another selected from the group consisting of halogen, cyano, monofluoromethyl, difluoromethyl, trifluoromethyl, (C1-C4)-alkyl, (C1-C4)-alkoxy, difluoromethoxy and trifluoromethoxy,

R2 represents hydrogen, (C1-C4)-alkyl, cyclopropyl, monofluoromethyl, difluoromethyl or trifluoromethyl,
R3 represents a group of the formula




 where
* represents the point of attachment to the carbonyl group,
L1A represents a bond or (C1-C4)-alkanediyl,
where (C1-C4)-alkanediyl may be substituted by 1 to 3 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, (C1-C4)-alkyl, (C3-C7)-cycloalkyl, hydroxy and (C1-C4)-alkoxy,

L1B represents a bond or (C1-C4)-alkanediyl,
L1C represents a bond or (C1-C4)-alkanediyl,
where (C1-C4)-alkanediyl may be substituted by 1 to 3 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, (C3-C7)-cycloalkyl, hydroxy and (C1-C4)-alkoxy,

R7 represents hydrogen, (C1-C6)-alkyl, (C2-C6)-alkenyl, (C2-C6)-alkynyl, (C3-C7)-cycloalkyl, 5- or 6-membered heteroaryl or phenyl,
where (C1-C6)-alkyl may be substituted by 1 to 3 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, difluoromethoxy, trifluoromethoxy, hydroxy, (C1-C4)-alkoxy, (C1-C4)-alkoxycarbonyl, (C1-C4)-alkyl sulphonyl, phenyl, phenoxy and benzyloxy,
where phenyl, phenoxy and benzyloxy for their part may be substituted by 1 to 3 halogen substituents,

where (C3-C7)-cycloalkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, (C1-C4)-alkyl and (C1-C4)-alkoxy,
and
where phenyl and 5- or 6-membered heteroaryl may be substituted by 1 to 3 substituents independently of one another selected from the group consisting of halogen, cyano, trifluoromethyl, (C1-C4)-alkyl, (C1-C4)-alkylsulphonyl and (C1-C4)-alkoxy,

R8 represents hydrogen or (C1-C4)-alkyl,
or
R7 and R8 together with the carbon atom to which they are attached form a 3- to 7-membered carbocycle or a 4- to 7-membered heterocycle,
where the 3- to 7-membered carbocycle and the 4- to 7-membered heterocycle for their part may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine and (C1-C4)-alkyl,

R9 represents hydrogen, (C1-C6)-alkyl, (C2-C6)-alkenyl, (C2-C6)-alkynyl, (C3-C7)-cycloalkyl, 5- or 6-membered heteroaryl or phenyl,
where (C1-C6)-alkyl may be substituted by 1 to 3 substituents independently of one another selected from the group consisting of fluorine, difluoromethyl, trifluoromethyl, difluoromethoxy, trifluoromethoxy, hydroxy, (C1-C4)-alkoxy, (C1-C4)-alkoxycarbonyl, (C1-C4)-alkylsulphonyl, phenyl, phenoxy and benzyloxy,
where phenyl, phenoxy and benzyloxy for their part may be substituted by 1 to 3 halogen substituents,

where (C3-C7)-cycloalkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, (C1-C4)-alkyl and (C1-C4)-alkoxy,
and
where phenyl and 5- or 6-membered heteroaryl may be substituted by 1 to 3 substituents independently of one another selected from the group consisting of halogen, cyano, trifluoromethyl, (C1-C4)-alkyl, (C1-C4)-alkoxy and (C1-C4)-alkylsulphonyl,

R10 represents hydrogen or (C1-C4)-alkyl,
or
R9 and R10 together with the carbon atom to which they are attached form a 3- to 7-membered carbocycle or a 4- to 7-membered heterocycle, where the 3- to 7-membered carbocycle and the 4- to 7-membered heterocycle for their part may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine and (C1-C4)-alkyl,
with the proviso that the radicals R7 and R9 do not both represent phenyl,
or
R7 and R9 together with the carbon atoms to which they are attached and with the group L1B form a 5- to 7-membered carbocycle or a 4- to 7-membered heterocycle,
with the proviso that not more than one of the radical pairs R7 and R8, R9 and R10 and R7 and R9, respectively, forms a carbo- or heterocycle,
R11 represents hydrogen or (C1-C4)-alkyl,
where (C1-C4)-alkyl may be substituted by 1 to 3 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, hydroxy and (C1-C4)-alkoxy,

R12 represents hydrogen, (C1-C6)-alkyl, (C3-C7)-cycloalkyl, phenyl or benzyl, where (C1-C6)-alkyl may be substituted by 1 to 3 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, hydroxy, (C1-C4)-alkoxy and phenoxy,
and
where phenyl and benzyl may be substituted by 1 to 3 substituents independently of one another selected from the group consisting of halogen and trifluoromethyl,

or
R11 and R12 together with the nitrogen atom to which they are attached form a 4- to 7-membered azaheterocycle,
where the 4- to 7-membered azaheterocycle may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, (C1-C4)-alkyl, (C3-C7)-cycloalkyl, hydroxy, (C1-C4)-alkoxy and 4- to 7-membered heterocyclyl,

and
L2 represents a bond or (C1-C4)-alkanediyl,
R13 represents 5- to 9-membered azaheterocyclyl which is attached via a ring carbon atom,
where 5- to 9-membered azaheterocyclyl may be substituted by 1 to 5 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, (C1-C4)-alkyl, (C3-C7)-cycloalkyl and benzyl,
and
where 5- to 9-membered azaheterocyclyl may be fused to a phenyl ring which for its part may be substituted by 1 or 2 substituents selected from the group consisting of halogen, (C1-C4)-alkyl and trifluoromethyl,


R4 represents hydrogen,
R5 represents hydrogen, halogen, cyano, difluoromethyl, trifluoromethyl, (C1-C4)-alkyl, (C3-C7)-cycloalkyl, (C2-C4)-alkynyl, difluoromethoxy, trifluoromethoxy, (C1-C4)-alkoxy, amino, 4- to 7-membered heterocyclyl or 5- or 6-membered heteroaryl,
R6 represents hydrogen, cyano or halogen,

and its N-oxides, salts, solvates, salts of the N-oxides and solvates of the N-oxides and salts.

2. The compound of claim 1 in which
A represents CH2, CD2 or CH(CH3),
R1 represents (C4-C6)-alkyl, (C4-C6)-cycloalkyl or phenyl,
where (C4-C6)-alkyl may be substituted up to six times by fluorine,
where (C4-C6)-cycloalkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl and methyl,
and
where phenyl may be substituted by 1 to 4 substituents independently of one another selected from the group consisting of fluorine, chlorine, cyano, methoxy, difluoromethyl, trifluoromethyl and methyl,

R2 represents hydrogen, trifluoromethyl, (C1-C4)-alkyl or cyclopropyl,
R3 represents a group of the formula




 where
* represents the point of attachment to the carbonyl group,
L1A represents a bond,
L1B represents a bond, methylene or 1,2-ethanediyl,
L1C represents a bond or methylene,
where methylene may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of trifluoromethyl, (C1-C4)-alkyl, cyclopropyl and cyclobutyl,

R7 represents hydrogen, trifluoromethyl, (C1-C6)-alkyl, (C3-C6)-cycloalkyl, 5- or 6-membered heteroaryl or phenyl,
where (C1-C6)-alkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, difluoromethoxy, trifluoromethoxy, hydroxy, (C1-C4)-alkoxy, phenyl, phenoxy and benzyloxy,
where phenyl, phenoxy and benzyloxy for their part may be substituted by 1 or 2 substituents selected from the group consisting of fluorine and chlorine,

where (C3-C6)-cycloalkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, methyl and ethyl,
and
where phenyl and 5- or 6-membered heteroaryl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, chlorine, cyano, methyl and trifluoromethyl,

R8 represents hydrogen, methyl or ethyl,
or
R7 and R8 together with the carbon atom to which they are attached form a 3- to 6-membered carbocycle or an oxetanyl, tetrahydrofuranyl, tetrahydropyranyl, azetidinyl, pyrrolidinyl or piperidinyl ring,
where the 3- to 6-membered carbocycle and the oxetanyl, tetrahydrofuranyl, tetrahydropyranyl, azetidinyl, pyrrolidinyl or piperidinyl ring may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine and methyl,

R9 represents hydrogen, 1,1,2,2-tetrafluoroethyl, trifluoromethyl, (C1-C6)-alkyl, (C3-C6)-cycloalkyl, 5- or 6-membered heteroaryl or phenyl,
where (C1-C6)-alkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, difluoromethoxy, trifluoromethoxy, hydroxy, (C1-C4)-alkoxy, phenyl, phenoxy and benzyloxy,
where phenyl, phenoxy and benzyloxy for their part may be substituted by 1 or 2 substituents selected from the group consisting of fluorine and chlorine,

where (C3-C6)-cycloalkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, methyl and ethyl,
and
where phenyl and 5- or 6-membered heteroaryl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, chlorine, cyano, methyl and trifluoromethyl,

R10 represents hydrogen, methyl or ethyl,
or
R9 and R10 together with the carbon atom to which they are attached form a 3- to 6-membered carbocycle or an oxetanyl, tetrahydrofuranyl, tetrahydropyranyl, azetidinyl, pyrrolidinyl or piperidinyl ring,
where the 3- to 6-membered carbocycle and the oxetanyl, tetrahydrofuranyl, tetrahydropyranyl, azetidinyl, pyrrolidinyl or piperidinyl ring may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine and methyl,

with the proviso that the radicals R7 and R9 do not both represent phenyl,
or
R7 and R9 together with the carbon atoms to which they are attached and with the group L1B form a cyclopentyl, cyclohexyl, azetidinyl, oxetanyl, pyrrolidinyl, tetrahydrofuranyl, piperidinyl or tetrahydropyranyl ring,
with the proviso that not more than one of the radical pairs R7 and R8, R9 and R10 and R7 and R9, respectively, forms one of the carbo- or heterocycles mentioned above,
R11 represents hydrogen or (C1-C3)-alkyl,
where (C1-C3)-alkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, hydroxy, methoxy and ethoxy,

R12 represents hydrogen, (C1-C4)-alkyl, cyclopropyl, cyclobutyl, phenyl or benzyl,
where (C1-C4)-alkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, hydroxy, (C1-C4)-alkoxy and phenoxy, and
where phenyl and benzyl may be substituted by 1 to 3 substituents independently of one another selected from the group consisting of fluorine, chlorine and trifluoromethyl,

or
R11 and R12 together with the nitrogen atom to which they are attached form an azetidinyl, pyrrolidinyl, piperidinyl, morpholinyl, piperazinyl, thiomorpholinyl or 1,1-dioxothiomorpholinyl ring,
where the azetidinyl, pyrrolidinyl, piperidinyl, morpholinyl, piperazinyl, thiomorpholinyl and 1,1-dioxothiomorpholinyl ring may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, methyl, ethyl, cyclopropyl, cyclobutyl, azetidinyl, pyrrolidinyl and piperidinyl,

and
L2 represents a bond, methylene or 1,1-ethanediyl,
R13 represents pyrrolidinyl, piperidinyl, 1,2,3,4-tetrahydroisoquinolinyl, 1,2,3,4-tetrahydroquinolinyl, indolinyl, 8-azabicyclo[3.2.1]octanyl, 9-azabicyclo[3.3.1]nonanyl, 3-azabicyclo-[4.1.0]heptanyl and quinuclidinyl attached via a ring carbon atom,
where pyrrolidinyl, piperidinyl, 1,2,3,4-tetrahydroisoquinolinyl, 1,2,3,4-tetrahydroquinolinyl, indolinyl, 8-azabicyclo[3.2.1]octanyl, 9-aza-bicyclo[3.3.1]nonanyl, 3-azabicyclo[4.1.0]heptanyl and quinuclidinyl may be substituted by 1 to 5 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, methyl, ethyl, cyclopropyl, cyclobutyl and benzyl,


R4 represents hydrogen,
R5 represents hydrogen, fluorine, chlorine, bromine, cyano, methyl, ethyl or cyclopropyl,
R6 represents hydrogen or fluorine,

and its N-oxides, salts, solvates, salts of the N-oxides and solvates of the N-oxides and salts.

3. The compound of claim 1 in which
A represents CH2,
R1 represents (C4-C6)-alkyl, (C4-C6)-cycloalkyl or phenyl,
where (C4-C6)-alkyl may be substituted up to six times by fluorine,
where (C4-C6)-cycloalkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl and methyl,
and
where phenyl may be substituted by 1 to 4 substituents independently of one another selected from the group consisting of fluorine, chlorine, difluoromethyl, trifluoromethyl and methyl,

R2 represents (C1-C3)-alkyl, trifluoromethyl or cyclopropyl,
R3 represents a group of the formula




 where
* represents the point of attachment to the carbonyl group,
L1A represents a bond,
L1B represents a bond or methylene,
L1C represents a bond or methylene,
where methylene may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of trifluoromethyl, (C1-C4)-alkyl, cyclopropyl and cyclobutyl,

R7 represents hydrogen, trifluoromethyl, (C1-C6)-alkyl, (C3-C6)-cycloalkyl or phenyl,
where (C1-C6)-alkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, hydroxy, (C1-C4)-alkoxy, phenyl, phenoxy and benzyloxy,
where phenyl, phenoxy and benzyloxy for their part may be substituted by 1 or 2 substituents selected from the group consisting of fluorine and chlorine,

where (C3-C6)-cycloalkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, methyl and ethyl,
and
where phenyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, chlorine, cyano and trifluoromethyl,

R8 represents hydrogen, methyl or ethyl,
or
R7 and R8 together with the carbon atom to which they are attached form a 3- to 6-membered carbocycle or an oxetanyl, tetrahydrofuranyl, tetrahydropyranyl, azetidinyl, pyrrolidinyl or piperidinyl ring,
where the 3- to 6-membered carbocycle and the oxetanyl, tetrahydrofuranyl, tetrahydropyranyl, azetidinyl, pyrrolidinyl or piperidinyl ring may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine and methyl,

R9 represents hydrogen, trifluoromethyl, (C1-C6)-alkyl, (C3-C6)-cycloalkyl or phenyl,
where (C1-C6)-alkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, hydroxy, (C1-C4)-alkoxy, phenyl, phenoxy and benzyloxy,
where phenyl, phenoxy and benzyloxy for their part may be substituted by 1 or 2 substituents selected from the group consisting of fluorine and chlorine,

where (C3-C6)-cycloalkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, methyl and ethyl,
and
where phenyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, chlorine, cyano and trifluoromethyl,

R10 represents hydrogen, methyl or ethyl,
or
R9 and R10 together with the carbon atom to which they are attached form a 3- to 6-membered carbocycle or an oxetanyl, tetrahydrofuranyl, tetrahydropyranyl, azetidinyl, pyrrolidinyl or piperidinyl ring,
where the 3- to 6-membered carbocycle and the oxetanyl, tetrahydrofuranyl, tetrahydropyranyl, azetidinyl, pyrrolidinyl or piperidinyl ring may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine and methyl,

with the proviso that the radicals R7 and R9 do not both represent phenyl,
or
R7 and R9 together with the carbon atoms to which they are attached and with the group L1B form a cyclopentyl, cyclohexyl, azetidinyl, oxetanyl, pyrrolidinyl, tetrahydrofuranyl, piperidinyl or tetrahydropyranyl ring,
with the proviso that not more than one of the radical pairs R7 and R8, R9 and R10 and R7 and R9, respectively, forms one of the carbo- or heterocycles mentioned above,
R11 represents hydrogen or (C1-C3)-alkyl,
where (C1-C3)-alkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine and trifluoromethyl,

R12 represents hydrogen, (C1-C4)-alkyl, cyclopropyl or cyclobutyl,
where (C1-C4)-alkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine and trifluoromethyl,

or
R11 and R12 together with the nitrogen atom to which they are attached form an azetidinyl, pyrrolidinyl, piperidinyl or morpholinyl ring,
where the azetidinyl, pyrrolidinyl, piperidinyl and morpholinyl ring may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, methyl, ethyl, cyclopropyl and cyclobutyl,

and
L2 represents a bond or methylene,
R13 represents pyrrolidinyl, piperidinyl, 1,2,3,4-tetrahydroisoquinolinyl, 1,2,3,4-tetrahydroquinolinyl, indolinyl, 8-azabicyclo[3.2.1]octanyl, 9-azabicyclo[3.3.1]nonanyl, 3-aza-bicyclo[4.1.0]heptanyl and quinuclidinyl attached via a ring carbon atom,
or
where pyrrolidinyl, piperidinyl, 1,2,3,4-tetrahydroisoquinolinyl, 1,2,3,4-tetrahydroquinolinyl, 8-azabicyclo[3.2.1]octanyl, 9-azabicyclo-[3.3.1]nonanyl, 3-azabicyclo[4.1.0]heptanyl and quinuclidinyl may be substituted by 1 to 5 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, methyl, ethyl, cyclopropyl, cyclobutyl and benzyl,


R4 represents hydrogen,
R5 represents hydrogen, fluorine, chlorine, methyl, ethyl or cyclopropyl,
R6 represents hydrogen,

and its N-oxides, salts, solvates, salts of the N-oxides and solvates of the N-oxides and salts.

4. The compound of claim 1 in which
A represents CH2,
R1 represents a phenyl group of the formula




 where
# represents the point of attachment to A,
and
R14, R15 and R16 independently of one another represent hydrogen, fluorine or chlorine,
with the proviso that at least two of the radicals R14, R15, R16 are different from hydrogen,

R2 represents methyl,
R3 represents a group of the formula




where
* represents the point of attachment to the carbonyl group,
L1A represents a bond,
L1B represents a bond,
L1C represents a bond,
R7 represents hydrogen, trifluoromethyl, (C1-C6)-alkyl, (C3-C6)-cycloalkyl or phenyl,
where (C1-C6)-alkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, hydroxy, (C1-C4)-alkoxy and phenyl,
and where phenyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine and chlorine,

R8 represents hydrogen, methyl or ethyl,
R9 represents hydrogen, trifluoromethyl, (C1-C6)-alkyl, cyclopropyl or phenyl,
where (C1-C6)-alkyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine, trifluoromethyl, hydroxy, (C1-C4)-alkoxy and phenyl,
and
where phenyl may be substituted by 1 or 2 substituents independently of one another selected from the group consisting of fluorine and chlorine,

R10 represents hydrogen, methyl or ethyl,
or
R9 and R10 together with the carbon atom to which they are attached form a 3- to 6-membered carbocycle or an oxetanyl ring,
with the proviso that the radicals R7 and R9 do not both represent phenyl,
or
R7 and R9 together with the carbon atoms to which they are attached and the group L1B form a cyclopentyl or cyclohexyl ring,
with the proviso that not more than one of the radical pairs R9 and R10 and R7 and
R9, respectively, forms one of the carbo- or heterocycles mentioned above,
R11 represents hydrogen,
R12 represents hydrogen,
and
L2 represents a bond,
R13 represents piperidin-2-yl, piperidin-3-yl, piperidin-4-yl or 1,2,3,4-tetrahydroquinolin-4-yl,
where piperidin-2-yl, piperidin-3-yl and piperidin-4-yl may be substituted by 1 to 5 substituents independently of one another selected from trifluoromethyl and methyl,
and
where 1,2,3,4-tetrahydroquinolin-4-yl may be substituted by fluorine or trifluoromethyl,


R4 represents hydrogen,
R5 represents hydrogen, fluorine, chlorine or methyl,
R6 represents hydrogen,

and its N-oxides, salts, solvates, salts of the N-oxides and solvates of the N-oxides and salts.

5. A process for preparing the compounds of the formula (I) as defined in claim 1, comprising:
[A] reacting a compound of formula (II)




 in which A, R1, R2, R4, R5 and R6 each have the meanings given in claim 1, and
T1 represents (C1-C4)-alkyl or benzyl,
in an inert solvent in the presence of a suitable base or acid to give a carboxylic acid of formula (III)




in which A, R1, R2, R4, R5 and R6 each have the meanings given above,
and this is subsequently reacted in an inert solvent under amide coupling conditions with an amine of formula (IV-A) or (IV-B)




in which L1A, L1B, L1C, L2, R7, R8, R9, and R10 each have the meanings given above
and
R11A, R12A and R13A have the meanings given above for R11, R12 and R13, respectively, or represent an amino protective group, for example tert-butoxycarbonyl, benzyloxycarbonyl or benzyl,
or
[B] reacting a compound of formula (III-B)




in which R2, R4, R5 and R6 each have the meanings given above,
in an inert solvent under amide coupling conditions with an amine of the formula (IV) to give a compound of the formula (I-A) and (I-B),




in which R2, R4, R5, R6, L1A, L1B, L1C, L2, R7, R8, R9, R10, R11A, R12A and R13A each have the meanings given above,
removing the benzyl group from the compound of formula (I-A) or (I-B) using methods known to the person skilled in the art and reacting the resulting compound of formula (V-A) or (V-B)




in which R2, R4, R5, R6, L1A, L1B, L1C, L2, R7, R8, R9, R10, R12A and R13A each have
the meanings given above,
in an inert solvent in the presence of a suitable base with a compound of formula (VI)




in which A and R1 have the meanings given above and
X1 represents a suitable leaving group, in particular chlorine, bromine, iodine, mesylate, triflate or tosylate,

removing any protective groups present, and the resulting compound of formula (I) is optionally converted with the appropriate (i) solvent and/or (ii) acid or base into the solvate, salt and/or solvate of a salt thereof.

6. A pharmaceutical composition, comprising a compound of claim 1 and an inert, non-toxic, pharmaceutically suitable auxiliary.

7. The pharmaceutical composition of claim 6, further comprising and an active compound selected from the group consisting of an organic nitrate, an NO donor, a cGMP-PDE inhibitor, an agent having antithrombotic activity, an agent lowering blood pressure, and an agent altering lipid metabolism.

8. A method for the treatment of heart failure, angina pectoris, hypertension, pulmonary hypertension, ischaemias, vascular disorders, kidney failure, thromboembolic disorders and arteriosclerosis comprising administering an effective amount of at least one compound of claim 1 to a human or animal in need thereof.

9. A method for the treatment of heart failure, angina pectoris, hypertension, pulmonary hypertension, ischaemias, vascular disorders, kidney failure, thromboembolic disorders and arteriosclerosis comprising administering an effective amount of the pharmaceutical composition of claim 6 to a human or animal in need thereof.

10. The compound according to claim 1, wherein the compound of formula (I) is selected from the group consisting of:



N-(9-Cyclopropyl-9-azabicyclo[3.3.1]non-3-yl)-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide;




N-[(2R)-1-Aminohexan-2-yl]-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide;




ent-N-(1-aminopropan-2-yl)-6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide;




N-[2-(1-Aminocyclohexyl)ethyl]-6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide;




ent-N-[1-amino-3-ethoxypropan-2-yl)-6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide (enantomier B);




8-[(2,6-difluorobenzyl)oxy]-2-methyl-N-(1,2,2,6,6-pentamethylpiperidin-4-yl)imidazo[1,2-a]pyridine-3-carboxamide;




ent-8-[(2,6-difluorobenzyl)oxy]-N-(6-fluoro-1,2,3,4-tetrahydroquinolin-4-yl)-2-methylimidazo[1,2-a]pyridine-3-carboxamide (enantomier B);




ent-N-(2-Amino-4,4,4-trifluorobutyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer A);




ent-N-(2-Amino-4,4,4-trifluorobutyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer B);




6-chloro-N-{2-[cyclopropyl(2,2-difluoroethyl)-amino]ethyl]}-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide;




rac-N-(2-amino-2-methylbutyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxamide;




ent-N-[(2S)-Amino-2-methylbutyl]-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer A);




ent-N-(2-Amino-2-methylpentyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer B);




ent-N-(2-Amino-2-methylpentyl)-6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer A); and




N-(2-Amino-2-methylpropyl)-2,6-dimethyl-8-[(2,3,6-trifluorobenzyl)oxy]imidazo[1,2-a]pyridine-3-carboxamide.

11. The compound according to claim 1, wherein the compound is selected from the group consisting of:



N-[(2R)-1-Aminohexan-2-yl]-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxamide;




8-[(2,6-difluorobenzyl)oxy]-2-methyl-N-(1,2,2,6,6-pentamethylpiperidin-4-yl)imidazo[1,2-a]pyridine-3-carboxamide;




ent-N-(2-Amino-4,4,4-trifluorobutyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer A);




ent-N-(2-Amino-4,4,4-trifluorobutyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer B);




rac-N-(2-amino-2-methylbutyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxamide;




ent-N-[(2S)-Amino-2-methylbutyl]-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer A);




ent-N-(2-Amino-2-methylpentyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer B);




ent-N-(2-Amino-2-methylpentyl)-6-chloro-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer A); and




N-(2-Amino-2-methylpropyl)-2,6-dimethyl-8-[(2,3,6-trifluorobenzyl)oxy]imidazo[1,2-a]pyridine-3-carboxamide.

12. The compound according to claim 1, wherein the compound of formula (I) is ent-8-[(2,6-difluorobenzyl)oxy]-N-(6-fluoro-1,2,3,4-tetrahydroquinolin-4-yl)-2-methylimidazo[1,2-a]pyridine-3-carboxamide (enantomier B):

13. The compound according to claim 1, wherein the compound of formula (I) is selected from the group consisting of the enantiomers of ent-N-(2-Amino-4,4,4-trifluorobutyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxamide:

14. The compound according to claim 1, wherein the compound of formula (I) is ent-N-[(2S)-Amino-2-methylbutyl]-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]-pyridine-3-carboxamide (enantiomer A):

15. The compound according to claim 1, wherein the compound of formula (I) is ent-N-(2-Amino-2-methylpentyl)-8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxamide (enantiomer B):