# Patent

## Title
Imidazopyridine derivatives as modulators of TNF activity

## Abstract

A series of substituted 3H-imidazo[4,5-c]pyridine derivatives of formula (I), being potent modulators of human TNFa activity, are accordingly of benefit in the treatment and/or prevention of various human ailments, including autoimmune and inflammatory disorders; neurological and neurodegenerative disorders; pain and nociceptive disorders; cardiovascular disorders; metabolic disorders; ocular disorders; and oncological disorders.

## Background
This application is the US national phase under 35 U.S.C. §371 of international application PCT/EP2014/076837, filed Dec. 8, 2014, which claims priority to GB application 1321735.1, filed Dec. 9, 2013.
The present invention relates to a class of fused imidazole derivatives, and to their use in therapy. More particularly, this invention is concerned with pharmacologically active substituted 3H-imidazo[4,5-c]pyridine derivatives. These compounds are modulators of the signalling of TNFα, and are accordingly of benefit as pharmaceutical agents, especially in the treatment of adverse inflammatory and autoimmune disorders, neurological and neurodegenerative disorders, pain and nociceptive disorders, cardiovascular disorders, metabolic disorders, ocular disorders, and oncological disorders.
TNFα is the prototypical member of the Tumour Necrosis Factor (TNF) superfamily of proteins that share a primary function of regulating cell survival and cell death. One structural feature common to all known members of the TNF superfamily is the formation of trimeric complexes that bind to, and activate, specific TNF superfamily receptors. By way of example, TNFα exists in soluble and transmembrane forms and signals through two receptors, known as TNFR1 and TNFR2, with distinct functional endpoints.
Various products capable of modulating TNFα activity are already commercially available. All are approved for the treatment of inflammatory and autoimmune disorders such as rheumatoid arthritis and Crohn's disease. All currently approved products are macromolecular and act by inhibiting the binding of human TNFα to its receptor. Typical macromolecular TNFα inhibitors include anti-TNFα antibodies; and soluble TNFα receptor fusion proteins. Examples of commercially available anti-TNFα antibodies include fully human antibodies such as adalimumab (Humira®) and golimumab (Simponi®), chimeric antibodies such as infliximab (Remicade®), and pegylated Fab′ fragments such as certolizumab pegol (Cimzia®). An example of a commercially available soluble TNFα receptor fusion protein is etanercept (Enbrel®).
TNF superfamily members, including TNFα itself, are implicated in a variety of physiological and pathological functions that are believed to play a part in a range of conditions of significant medical importance (see, for example, M. G. Tansey & D. E. Szymkowski, Drug Discovery Today, 2009, 14, 1082-1088; and F. S. Carneiro et al., J. Sexual Medicine, 2010, 7, 3823-3834).
The compounds in accordance with the present invention, being potent modulators of human TNFα activity, are therefore beneficial in the treatment and/or prevention of various human ailments. These include autoimmune and inflammatory disorders; neurological and neurodegenerative disorders; pain and nociceptive disorders; cardiovascular disorders; metabolic disorders; ocular disorders; and oncological disorders.
In addition, the compounds in accordance with the present invention may be beneficial as pharmacological standards for use in the development of new biological tests and in the search for new pharmacological agents. Thus, in one embodiment, the compounds of this invention may be useful as radioligands in assays for detecting pharmacologically active compounds. In an alternative embodiment, certain compounds of this invention may be useful for coupling to a fluorophore to provide fluorescent conjugates that can be utilised in assays (e.g. a fluorescence polarisation assay) for detecting pharmacologically active compounds.
Co-pending international patent applications WO 2013/186229 (published 19 Dec. 2013), WO 2014/009295 (published 16 Jan. 2014) and WO 2014/009296 (also published 16 Jan. 2014) describe fused imidazole derivatives which are modulators of human TNFα activity.
None of the prior art available to date, however, discloses or suggests the precise structural class of imidazopyridine derivatives as provided by the present invention.
The compounds in accordance with the present invention potently inhibit the binding of a fluorescence conjugate to TNFα when tested in the fluorescence polarisation assay described herein. Indeed, when tested in that assay, the compounds of the present invention exhibit an IC50 value of 50 μM or less, generally of 20 μM or less, usually of 5 μM or less, typically of 1 μM or less, suitably of 500 nM or less, ideally of 100 nM or less, and preferably of 20 nM or less (the skilled person will appreciate that a lower IC50 figure denotes a more active compound).
Certain compounds in accordance with the present invention potently neutralise the activity of TNFα in a commercially available HEK-293 derived reporter cell line known as HEK-BlueTM CD40L. This is a stable HEK-293 transfected cell line expressing SEAP (secreted embryonic alkaline phosphatase) under the control of the IFNβ minimal promoter fused to five NF-κB binding sites. Secretion of SEAP by these cells is stimulated in a concentration-dependent manner by TNFα. When tested in the HEK-293 bioassay, also referred to herein as the reporter gene assay, certain compounds of the present invention exhibit an IC50 value of 50 μM or less, generally of 20 μM or less, usually of 5 μM or less, typically of 1 μM or less, suitably of 500 nM or less, ideally of 100 nM or less, and preferably of 20 nM or less (as before, the skilled person will appreciate that a lower IC50 figure denotes a more active compound).
The present invention provides a compound of formula (I) or an N-oxide thereof, or a pharmaceutically acceptable salt or solvate thereof, or a glucuronide derivative thereof, or a co-crystal thereof:




wherein

E represents a covalent bond; or E represents —S(O)2— or —N(R4)—; or E represents an optionally substituted straight or branched C1-4 alkylene chain;
Q represents a covalent bond; or Q represents —O—, —S—, —S(O)—, —S(O)2—, —S(O)(NR5)—, —N(R5)—, —C(O)N(R5)—, —N(R5)C(O)—, —S(O)2N(R5)— or —N(R5)S(O)2—; or Q represents an optionally substituted straight or branched C1-6 alkylene chain optionally comprising one, two or three heteroatom-containing linkages independently selected from —O—, —S—, —S(O)—, —S(O)2—, —S(O)(NR5)—, —N(R5)—, —C(O)N(R5)—, —N(R5)C(O)—, —S(O)2N(R5)— and —N(R5)S(O)2—;
Y represents C3-7 cycloalkyl, aryl, C3-7 heterocycloalkyl or heteroaryl, any of which groups may be optionally substituted by one or more substituents;
Z represents hydrogen, halogen or trifluoromethyl; or Z represents C1-6 alkyl, C3-7 cycloalkyl, aryl, C3-7 heterocycloalkyl, C3-7 heterocycloalkenyl or heteroaryl, any of which groups may be optionally substituted by one or more substituents; or Z represents —Z1-Z2 or —Z1—C(O)—Z2, either of which moieties may be optionally substituted by one or more substituents;
Z1 represents a divalent radical derived from an aryl, C3-7 heterocycloalkyl or heteroaryl group;
Z2 represents aryl, C3-7 heterocycloalkyl, C3-7 heterocycloalkenyl or heteroaryl;
R1, R2 and R3 independently represent hydrogen, halogen, cyano, nitro, hydroxy, trifluoromethyl, trifluoromethoxy, —ORa, —SRa, —SORa, —SO2Ra, —SF5, —NRbRc, —NRcCORd, —NRcCO2Rd, —NHCONRbRc, —NRcSO2Re, —N(SO2Re)2, —NHSO2NRbRc, —CORd, —CO2Rd, —CONRbRc, —CON(ORa)Rb, —SO2NRbRc or —SO(NRb)Rd; or C1-6 alkyl, C2-6 alkenyl, C2-6 alkynyl, C3-7 cycloalkyl, C4-7 cycloalkenyl, C3-7 cycloalkyl(C1-6)alkyl, aryl, aryl(C1-6)-alkyl, C3-7 heterocycloalkyl, C3-7 heterocycloalkyl(C1-6)alkyl, C3-7 heterocycloalkenyl, C4-9 heterobicycloalkyl, heteroaryl, heteroaryl(C1-6)alkyl, (C3-7)heterocycloalkyl(C1-6)alkyl-aryl-, heteroaryl(C3-7)heterocycloalkyl-, (C3-7)cycloalkyl-heteroaryl-, (C3-7)cycloalkyl-(C1-6)alkyl-heteroaryl-, (C4-7)cycloalkenyl-heteroaryl-, (C4-9)bicycloalkyl-heteroaryl-, (C3-7)heterocycloalkyl-heteroaryl-, (C3-7)heterocycloalkyl(C1-6)alkyl-heteroaryl-, (C3-7)heterocycloalkenyl-heteroaryl-, (C4-9)heterobicycloalkyl-heteroaryl- or (C4-9)spiroheterocycloalkyl-heteroaryl-, any of which groups may be optionally substituted by one or more substituents;
R4 and R5 independently represent hydrogen or C1-6 alkyl;
Ra represents C1-6 alkyl, aryl, aryl(C1-6)alkyl, heteroaryl or heteroaryl(C1-6)alkyl, any of which groups may be optionally substituted by one or more substituents;
Rb and Rc independently represent hydrogen or trifluoromethyl; or C1-6 alkyl, C3-7 cycloalkyl, C3-7 cycloalkyl(C1-6)alkyl, aryl, aryl(C1-6)alkyl, C3-7 heterocycloalkyl, C3-7 heterocycloalkyl(C1-6)alkyl, heteroaryl or heteroaryl(C1-6)alkyl, any of which groups may be optionally substituted by one or more substituents; or
Rb and Rc, when taken together with the nitrogen atom to which they are both attached, represent azetidin-1-yl, pyrrolidin-1-yl, oxazolidin-3-yl, isoxazolidin-2-yl, thiazolidin-3-yl, isothiazolidin-2-yl, piperidin-1-yl, morpholin-4-yl, thiomorpholin-4-yl, piperazin-1-yl, homopiperidin-1-yl, homomorpholin-4-yl or homopiperazin-1-yl, any of which groups may be optionally substituted by one or more substituents;
Rd represents hydrogen; or C1-6 alkyl, C3-7 cycloalkyl, aryl, C3-7 heterocycloalkyl or heteroaryl, any of which groups may be optionally substituted by one or more substituents; and
Re represents C1-6 alkyl, aryl or heteroaryl, any of which groups may be optionally substituted by one or more substituents.
The present invention also provides a compound of formula (I) as defined above or an N-oxide thereof, or a pharmaceutically acceptable salt or solvate thereof, or a glucuronide derivative thereof, or a co-crystal thereof, for use in therapy.
The present invention also provides a compound of formula (I) as defined above or an N-oxide thereof, or a pharmaceutically acceptable salt or solvate thereof, or a glucuronide derivative thereof, or a co-crystal thereof, for use in the treatment and/or prevention of disorders for which the administration of a modulator of TNFα function is indicated.
In another aspect, the present invention provides a compound of formula (I) as defined above or an N-oxide thereof, or a pharmaceutically acceptable salt or solvate thereof, or a glucuronide derivative thereof, or a co-crystal thereof, for use in the treatment and/or prevention of an inflammatory or autoimmune disorder, a neurological or neurodegenerative disorder, pain or a nociceptive disorder, a cardiovascular disorder, a metabolic disorder, an ocular disorder, or an oncological disorder.
The present invention also provides a method for the treatment and/or prevention of disorders for which the administration of a modulator of TNFα function is indicated which comprises administering to a patient in need of such treatment an effective amount of a compound of formula (I) as defined above or an N-oxide thereof, or a pharmaceutically acceptable salt or solvate thereof, or a glucuronide derivative thereof, or a co-crystal thereof.
In another aspect, the present invention provides a method for the treatment and/or prevention of an inflammatory or autoimmune disorder, a neurological or neurodegenerative disorder, pain or a nociceptive disorder, a cardiovascular disorder, a metabolic disorder, an ocular disorder, or an oncological disorder, which comprises administering to a patient in need of such treatment an effective amount of a compound of formula (I) as defined above or an N-oxide thereof, or a pharmaceutically acceptable salt or solvate thereof, or a glucuronide derivative thereof, or a co-crystal thereof.
Where any of the groups in the compounds of formula (I) above is stated to be optionally substituted, this group may be unsubstituted, or substituted by one or more substituents. Typically, such groups will be unsubstituted, or substituted by one or two substituents.
For use in medicine, the salts of the compounds of formula (I) will be pharmaceutically acceptable salts. Other salts may, however, be useful in the preparation of the compounds of use in the invention or of their pharmaceutically acceptable salts. Standard principles underlying the selection and preparation of pharmaceutically acceptable salts are described, for example, in Handbook of Pharmaceutical Salts: Properties, Selection and Use, ed. P. H. Stahl & C. G. Wermuth, Wiley-VCH, 2002. Suitable pharmaceutically acceptable salts of the compounds of use in this invention include acid addition salts which may, for example, be formed by mixing a solution of the compound of use in the invention with a solution of a pharmaceutically acceptable acid such as hydrochloric acid, sulphuric acid, methanesulphonic acid, fumaric acid, maleic acid, succinic acid, acetic acid, benzoic acid, citric acid, tartaric acid or phosphoric acid. Furthermore, where the compounds of use in the invention carry an acidic moiety, e.g. carboxy, suitable pharmaceutically acceptable salts thereof may include alkali metal salts, e.g. sodium or potassium salts; alkaline earth metal salts, e.g. calcium or magnesium salts; ammonium salts; and salts formed with suitable organic ligands, e.g. quaternary ammonium salts, and meglumine salts.
The present invention includes within its scope solvates of the compounds of formula (I) above. Such solvates may be formed with common organic solvents, e.g. hydrocarbon solvents such as benzene or toluene; chlorinated solvents such as chloroform or dichloromethane; alcoholic solvents such as methanol, ethanol or isopropanol; ethereal solvents such as diethyl ether or tetrahydrofuran; or ester solvents such as ethyl acetate. Alternatively, the solvates of the compounds of formula (I) may be formed with water, in which case they will be hydrates.
The present invention also includes co-crystals within its scope. The technical term “co-crystal” is used to describe the situation where neutral molecular components are present within a crystalline compound in a definite stoichiometric ratio. The preparation of pharmaceutical co-crystals enables modifications to be made to the crystalline form of an active pharmaceutical ingredient, which in turn can alter its physicochemical properties without compromising its intended biological activity (see Pharmaceutical Salts and Co-crystals, ed. J. Wouters & L. Quere, RSC Publishing, 2012). Typical examples of co-crystal formers, which may be present in the co-crystal alongside the active pharmaceutical ingredient, include L-ascorbic acid, citric acid, glutaric acid, urea and nicotinamide.
The present invention includes within its scope prodrugs of the compounds of formula (I) above. In general, such prodrugs will be functional derivatives of the compounds of formula (I) which are readily convertible in vivo into the required compound of formula (I). Conventional procedures for the selection and preparation of suitable prodrug derivatives are described, for example, in Design of Prodrugs, ed. H. Bundgaard, Elsevier, 1985.
Suitable alkyl groups which may be present on the compounds of use in the invention include straight-chained and branched C1-6 alkyl groups, for example C1-4 alkyl groups. Typical examples include methyl and ethyl groups, and straight-chained or branched propyl, butyl and pentyl groups. Particular alkyl groups include methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, 2,2-dimethylpropyl and 3-methylbutyl. Derived expressions such as “C1-6 alkoxy”, “C1-6 alkylthio”, “C1-6 alkylsulphonyl” and “C1-6 alkylamino” are to be construed accordingly.
The expression “C1-4 alkylene chain” refers to a divalent straight or branched alkylene chain containing 1 to 4 carbon atoms. Typical examples include methylene, ethylene, methylmethylene, ethylmethylene and dimethylmethylene.
Suitable C2-6 alkenyl groups include vinyl and allyl.
Suitable C2-6 alkynyl groups include ethynyl, propargyl and butynyl.
The term “C3-7 cycloalkyl” as used herein refers to monovalent groups of 3 to 7 carbon atoms derived from a saturated monocyclic hydrocarbon, and may comprise benzo-fused analogues thereof. Suitable C3-7 cycloalkyl groups include cyclopropyl, cyclobutyl, benzocyclobutenyl, cyclopentyl, indanyl, cyclohexyl and cycloheptyl.
The term “C4-7 cycloalkenyl” as used herein refers to monovalent groups of 4 to 7 carbon atoms derived from a partially unsaturated monocyclic hydrocarbon. Suitable C4-7 cycloalkenyl groups include cyclobutenyl, cyclopentenyl, cyclohexenyl and cycloheptenyl.
The term “C4-9 bicycloalkyl” as used herein refers to monovalent groups of 4 to 9 carbon atoms derived from a saturated bicyclic hydrocarbon. Typical bicycloalkyl groups include bicyclo[3.1.0]hexanyl, bicyclo[4.1.0]heptanyl and bicyclo[2.2.2]octanyl.
The term “aryl” as used herein refers to monovalent carbocyclic aromatic groups derived from a single aromatic ring or multiple condensed aromatic rings. Suitable aryl groups include phenyl and naphthyl, preferably phenyl.
Suitable aryl(C1-6)alkyl groups include benzyl, phenylethyl, phenylpropyl and naphthylmethyl.
The term “C3-7 heterocycloalkyl” as used herein refers to saturated monocyclic rings containing 3 to 7 carbon atoms and at least one heteroatom selected from oxygen, sulphur and nitrogen, and may comprise benzo-fused analogues thereof. Suitable heterocycloalkyl groups include oxetanyl, azetidinyl, tetrahydrofuranyl, dihydrobenzo-furanyl, dihydrobenzothienyl, pyrrolidinyl, indolinyl, isoindolinyl, oxazolidinyl, thiazolidinyl, isothiazolidinyl, imidazolidinyl, tetrahydropyranyl, chromanyl, tetrahydro-thiopyranyl, piperidinyl, 1,2,3,4-tetrahydroquinolinyl, 1,2,3,4-tetrahydroisoquinolinyl, piperazinyl, 1,2,3,4-tetrahydroquinoxalinyl, hexahydro-[1,2,5]thiadiazolo[2,3-a]pyrazinyl, homopiperazinyl, morpholinyl, benzoxazinyl, thiomorpholinyl, azepanyl, oxazepanyl, diazepanyl, thiadiazepanyl and azocanyl.
The term “C3-7 heterocycloalkenyl” as used herein refers to monounsaturated or polyunsaturated monocyclic rings containing 3 to 7 carbon atoms and at least one heteroatom selected from oxygen, sulphur and nitrogen, and may comprise benzo-fused analogues thereof. Suitable heterocycloalkenyl groups include thiazolinyl, isothiazolinyl, imidazolinyl, dihydropyranyl, dihydrothiopyranyl and 1,2,3,6-tetrahydropyridinyl.
The term “C4-9 heterobicycloalkyl” as used herein corresponds to C4-9 bicycloalkyl wherein one or more of the carbon atoms have been replaced by one or more heteroatoms selected from oxygen, sulphur and nitrogen. Typical heterobicycloalkyl groups include 3-azabicyclo[3.1.0]hexanyl, 2-oxa-5-azabicyclo[2.2.1]heptanyl, 6-azabicyclo[3.2.0]heptanyl, 3-azabicyclo[3.1.1]heptanyl, 3-azabicyclo[4.1.0]heptanyl, 2-oxabicyclo[2.2.2]octanyl, quinuclidinyl, 2-oxa-5-azabicyclo[2.2.2]octanyl, 3-azabicyclo[3.2.1]octanyl, 8-azabicyclo-[3.2.1]octanyl, 3-oxa-8-azabicyclo[3.2.1]octanyl, 3,8-diazabicyclo[3.2.1]octanyl, 3,6-diazabicyclo[3.2.2]nonanyl, 3-oxa-7-azabicyclo[3.3.1]nonanyl and 3,9-diazabicyclo-[4.2.1]nonanyl.
The term “C4-9 spiroheterocycloalkyl” as used herein refers to saturated bicyclic ring systems containing 4 to 9 carbon atoms and at least one heteroatom selected from oxygen, sulphur and nitrogen, in which the two rings are linked by a common atom. Suitable spiroheterocycloalkyl groups include 5-azaspiro[2.3]hexanyl, 5-azaspiro[2.4]-heptanyl, 2-azaspiro[3.3]heptanyl, 2-oxa-6-azaspiro[3.3]heptanyl, 2-oxa-6-azaspiro[3.4]-octanyl, 2-oxa-6-azaspiro[3.5]nonanyl, 7-oxa-2-azaspiro[3.5]nonanyl, 2-oxa-7-azaspiro-[3.5]nonanyl and 2,4,8-triazaspiro[4.5]decanyl.
The term “heteroaryl” as used herein refers to monovalent aromatic groups containing at least 5 atoms derived from a single ring or multiple condensed rings, wherein one or more carbon atoms have been replaced by one or more heteroatoms selected from oxygen, sulphur and nitrogen. Suitable heteroaryl groups include furyl, benzofuryl, dibenzofuryl, thienyl, benzothienyl, thieno[2,3-c]pyrazolyl, thieno[3,4-b][1,4]dioxinyl, dibenzothienyl, pyrrolyl, indolyl, pyrrolo[2,3-b]pyridinyl, pyrrolo[3,2-c]pyridinyl, pyrrolo[3,4-b]pyridinyl, pyrazolyl, pyrazolo[1,5-a]pyridinyl, pyrazolo[3,4-d]pyrimidinyl, indazolyl, 4,5,6,7-tetrahydroindazolyl, oxazolyl, benzoxazolyl, isoxazolyl, thiazolyl, benzothiazolyl, isothiazolyl, imidazolyl, benzimidazolyl, imidazo[2,1-b]thiazolyl, imidazo[1,2-a]pyridinyl, imidazo[4,5-b]pyridinyl, purinyl, imidazo[1,2-a]pyrimidinyl, imidazo[1,2-a]pyrazinyl, oxadiazolyl, thiadiazolyl, triazolyl, [1,2,4]triazolo[1,5-a]-pyrimidinyl, benzotriazolyl, tetrazolyl, pyridinyl, quinolinyl, isoquinolinyl, naphthyridinyl, pyridazinyl, cinnolinyl, phthalazinyl, pyrimidinyl, quinazolinyl, pyrazinyl, quinoxalinyl, pteridinyl, triazinyl and chromenyl groups.
The term “halogen” as used herein is intended to include fluorine, chlorine, bromine and iodine atoms, typically fluorine, chlorine or bromine.
Where the compounds of formula (I) have one or more asymmetric centres, they may accordingly exist as enantiomers. Where the compounds of use in the invention possess two or more asymmetric centres, they may additionally exist as diastereomers. The invention is to be understood to extend to the use of all such enantiomers and diastereomers, and to mixtures thereof in any proportion, including racemates. Formula (I) and the formulae depicted hereinafter are intended to represent all individual stereoisomers and all possible mixtures thereof, unless stated or shown otherwise. In addition, compounds of formula (I) may exist as tautomers, for example keto (CH2C═O)enol (CH═CHOH) tautomers or amide (NHC═O)hydroxyimine (N═COH) tautomers. Formula (I) and the formulae depicted hereinafter are intended to represent all individual tautomers and all possible mixtures thereof, unless stated or shown otherwise.
It is to be understood that each individual atom present in formula (I), or in the formulae depicted hereinafter, may in fact be present in the form of any of its naturally occurring isotopes, with the most abundant isotope(s) being preferred. Thus, by way of example, each individual hydrogen atom present in formula (I), or in the formulae depicted hereinafter, may be present as a 1H, 2H (deuterium) or 3H (tritium) atom, preferably 1H. Similarly, by way of example, each individual carbon atom present in formula (I), or in the formulae depicted hereinafter, may be present as a 12C, 13C or 14C atom, preferably 12C.
In one aspect, the present invention provides a compound of formula (I) as depicted above or an N-oxide thereof, or a pharmaceutically acceptable salt or solvate thereof, or a glucuronide derivative thereof, or a co-crystal thereof, wherein
Q represents —O—, —S—, —S(O)—, —S(O)2—, —S(O)(NR5)—, —N(R5)—, —C(O)N(R5)—, —N(R5)C(O)—, —S(O)2N(R5)— or —N(R5)S(O)2—; or Q represents an optionally substituted straight or branched C1-6 alkylene chain optionally comprising one, two or three heteroatom-containing linkages independently selected from —O—, —S—, —S(O)—, —S(O)2—, —S(O)(NR5)—, —N(R5)—, —C(O)N(R5)—, —N(R5)C(O)—, —S(O)2N(R5)— and —N(R5)S(O)2—;
Z represents C3-7 cycloalkyl, aryl, C3-7 heterocycloalkyl, C3-7 heterocycloalkenyl or heteroaryl, any of which groups may be optionally substituted by one or more substituents; or Z represents —Z1-Z2 or —Z1—C(O)—Z2, either of which moieties may be optionally substituted by one or more substituents; and
E, Y, R1, R2, R3, R5, Z1 and Z2 are as defined above.
In another aspect, the present invention provides a compound of formula (I) as depicted above or an N-oxide thereof, or a pharmaceutically acceptable salt or solvate thereof, or a glucuronide derivative thereof, or a co-crystal thereof, wherein
R1 represents halogen or cyano; or C1-6 alkyl, C2-6 alkenyl, C2-6 alkynyl, C3-7 cycloalkyl, C4-7 cycloalkenyl, C3-7 cycloalkyl(C1-6)alkyl, aryl, aryl(C1-6)alkyl, C3-7 heterocycloalkyl, C3-7 heterocycloalkyl(C1-6)alkyl, C3-7 heterocycloalkenyl, C4-9 heterobicycloalkyl, heteroaryl, heteroaryl(C1-6)alkyl, (C3-7)heterocycloalkyl(C1-6)alkyl-aryl-, heteroaryl(C3-7)heterocycloalkyl-, (C3-7)cycloalkyl-heteroaryl-, (C3-7)cycloalkyl-(C1-6)alkyl-heteroaryl-, (C4-7)cycloalkenyl-heteroaryl-, (C4-9)bicycloalkyl-heteroaryl-, (C3-7)heterocycloalkyl-heteroaryl-, (C3-7)heterocycloalkyl(C1-6)alkyl-heteroaryl-, (C3-7)heterocycloalkenyl-heteroaryl-, (C4-9)heterobicycloalkyl-heteroaryl- or (C4-9)spiroheterocycloalkyl-heteroaryl-, any of which groups may be optionally substituted by one or more substituents; and
E, Q, Y, Z, R2 and R3 are as defined above.
Where the compounds in accordance with the invention comprise an optionally substituted straight or branched alkylene chain, typical values thereof include methylene (—CH2—), (methyl)methylene, ethylene (—CH2CH2—), (ethyl)methylene, (dimethyl)-methylene, (methyl)ethylene, propylene (—CH2CH2CH2—), (propyl)methylene and (dimethyl)ethylene, any of which chains may be optionally substituted by one or more substituents. Suitably, such chains are unsubstituted, monosubstituted or disubstituted. Typically, such chains are unsubstituted or monosubstituted. In one embodiment, such chains are unsubstituted. In another embodiment, such chains are monosubstituted. In a further embodiment, such chains are disubstituted.
Examples of typical substituents on the alkylene chain which may be present in a compound in accordance with the invention include halogen, cyano, trifluoromethyl, oxo, hydroxy, C1-6 alkoxy, carboxy(C1-6)alkoxy, trifluoromethoxy, amino, C1-6 alkylamino, di(C1-6)alkylamino, C2-6 alkylcarbonylamino, carboxy, benzyloxycarbonyl, tetrazolyl, aminocarbonyl, C1-6 alkylaminocarbonyl and di(C1-6)alkylaminocarbonyl.
Specific examples of suitable substituents on the alkylene chain which may be present in a compound in accordance with the invention include fluoro, cyano, trifluoromethyl, hydroxy, methoxy, carboxymethoxy, amino, acetylamino, carboxy, benzyloxycarbonyl and tetrazolyl.
In a first embodiment, E represents a covalent bond, whereby the integer Y is attached directly to the imidazole ring.
In a second embodiment, E represents —S(O)2— or —N(R4)—. In a first aspect of that embodiment, E represents —S(O)2—. In a second aspect of that embodiment, E represents —N(R4)—.
In a third embodiment, E represents an optionally substituted straight or branched C1-4 alkylene chain. In a first aspect of that embodiment, E represents an optionally substituted methylene (—CH2—) linkage. In a second aspect of that embodiment, E represents an optionally substituted (methyl)methylene linkage. In a third aspect of that embodiment, E represents an optionally substituted (ethyl)methylene linkage.
Generally, E represents a covalent bond; or E represents —N(R4)—; or E represents an optionally substituted straight or branched C1-4 alkylene chain.
Typically, E represents —N(R4)—; or E represents an optionally substituted straight or branched C1-4 alkylene chain.
Suitably, E represents a covalent bond; or E represents —N(R4)—; or E represents methylene (—CH2—), (methyl)methylene or (ethyl)methylene, any of which groups may be optionally substituted by one or more substituents.
Generally, E represents —N(R4)—; or E represents methylene (—CH2—) or (ethyl)methylene, either of which groups may be optionally substituted by one or more substituents.
Appositely, E represents —N(R4)—, or optionally substituted methylene.
Selected examples of typical substituents on the linkage represented by E include halogen, trifluoromethyl, oxo, hydroxy, C1-6 alkoxy, carboxy(C1-6)alkoxy, trifluoromethoxy, amino, C1-6 alkylamino, di(C1-6)alkylamino, C2-6 alkylcarbonylamino, carboxy, benzyloxycarbonyl and tetrazolyl.
Specific examples of typical substituents on the linkage represented by E include fluoro, trifluoromethyl, oxo, hydroxy, methoxy, carboxymethoxy, trifluoromethoxy, amino, methylamino, dimethylamino, acetylamino, carboxy, benzyloxycarbonyl and tetrazolyl.
Typical values of E include —N(R4)—, —CH2—, —C(O)—, —CH(OCH3)—, —CH(OCH2CO2H)—, —CH(NHCOCH3)—, —CH(CO2benzyl)-, —CH(CH3)— and —CH(CH2CH3)—; or E may represent a covalent bond.
Illustrative values of E include —CH2— and —C(O)—.
Suitable values of E include —N(R4)— and —CH2—. In one embodiment, E represents —N(R4)—. In another embodiment, E represents —CH2—.
In another embodiment, E represents —C(O)—.
In another embodiment, E represents —CH(OCH3)—.
In an additional embodiment, E represents —CH(CH3)—. In a particular aspect of that embodiment, the —CH(CH3)— linkage represented by E is in the (S) stereochemical configuration.
In a further embodiment, E represents —CH(CH2CH3)—.
In a first embodiment, Q represents a covalent bond, whereby the integer Z is attached directly to the imidazole ring.
In a second embodiment, Q represents —O—, —S—, —S(O)—, —S(O)2—, —S(O)(NR5)—, —N(R5)—, —C(O)N(R5)—, —N(R5)C(O)—, —S(O)2N(R5)— or —N(R5)S(O)2—. In a first aspect of that embodiment, Q represents —O—. In a second aspect of that embodiment, Q represents —S—. In a third aspect of that embodiment, Q represents —S(O)—. In a fourth aspect of that embodiment, Q represents —S(O)2—. In a fifth aspect of that embodiment, Q represents —S(O)(NR5)—. In a sixth aspect of that embodiment, Q represents —N(R5)—. In a seventh aspect of that embodiment, Q represents —C(O)N(R5)—. In an eighth aspect of that embodiment, Q represents —N(R5)C(O)—. In a ninth aspect of that embodiment, Q represents —S(O)2N(R5)—. In a tenth aspect of that embodiment, Q represents —N(R5)S(O)2—.
In a third embodiment, Q represents an optionally substituted straight or branched C1-6 alkylene chain optionally comprising one, two or three heteroatom-containing linkages independently selected from —O—, —S—, —S(O)—, —S(O)2—, —S(O)(NR5)—, —N(R5)—, —C(O)N(R5)—, —N(R5)C(O)—, —S(O)2N(R5)— and —N(R5)S(O)2—. In a first aspect of that embodiment, Q represents an optionally substituted straight or branched C1-6 alkylene chain. In a second aspect of that embodiment, Q represents an optionally substituted straight or branched C1-6 alkylene chain comprising one heteroatom-containing linkage independently selected from —O—, —S—, —S(O)—, —S(O)2—, —S(O)(NR5)—, —N(R5)—, —C(O)N(R5)—, —N(R5)C(O)—, —S(O)2N(R5)— and —N(R5)S(O)2—. In a third aspect of that embodiment, Q represents an optionally substituted straight or branched C1-6 alkylene chain comprising two heteroatom-containing linkages independently selected from —O—, —S—, —S(O)—, —S(O)2—, —S(O)(NR5)—, —N(R5)—, —C(O)N(R5)—, —N(R5)C(O)—, —S(O)2N(R5)— and —N(R5)S(O)2—. In a fourth aspect of that embodiment, Q represents an optionally substituted straight or branched C1-6 alkylene chain comprising three heteroatom-containing linkages independently selected from —O—, —S—, —S(O)—, —S(O)2—, —S(O)(NR5)—, —N(R5)—, —C(O)N(R5)—, —N(R5)C(O)—, —S(O)2N(R5)— and —N(R5)S(O)2—. In a fifth aspect of that embodiment, Q represents an optionally substituted straight or branched C1-6 alkylene chain comprising one, two or three heteroatom-containing linkages independently selected from —O—, —S—, —N(R5)—, —C(O)N(R5)— and —N(R5)C(O)—.
Typically, Q represents a covalent bond; or Q represents —S(O)— or —S(O)2—; or Q represents an optionally substituted straight or branched C1-6 alkylene chain optionally comprising one or two heteroatom-containing linkages selected from —O—, —S—, —N(R5)—, —C(O)N(R5)—, and —N(R5)C(O)—.
Selected examples of typical substituents on the linkage represented by Q include halogen, cyano, trifluoromethyl, hydroxy, C1-6 alkoxy and amino.
Specific examples of typical substituents on the linkage represented by Q include fluoro, cyano, trifluoromethyl, hydroxy, methoxy and amino.
Suitably, Q represents a covalent bond; or Q represents —S(O)—, —S(O)2— or —N(R5)—; or Q represents —CH2—, —CH(F)—, —CF2—, —CH(CN)—, —CH(CH3)—, —CH(OH)—, —CH(CH2OH)—, —CH(OCH3)—, —CH(NH2)—, —CH2CH2—, —CH(OH)CH2—, —CH(OH)CF2—, —CH(OCH3)CH2—, —CH2O—, —CH(CH3)O—, —C(CH3)2O—, —CH(CH2CH3)O—, —CH(CF3)O—, —CH2S—, —CH2S(O)—, —CH2S(O)2—, —CH2N(R5)—, —CH2CH2CH2—, —CH(OH)CH2CH2—, —CH(OCH3)CH2CH2—, —CH2CH2O—, —CH2OCH2—, —CH2OCH(F)—, —CH2OCF2—, —CH2OCH(CH3)—, —CH(CH3)OCH2—, —CH2OC(CH3)2—, —C(CH3)2OCH2—, —CH2SCH2—, —CH2S(O)CH2—, —CH2S(O)2CH2—, —CH2CH2N(R5)—, —CH2N(R5)CH2—, —CH2N(R5)C(O)—, —CH2CH2OCH2—, —CH2CH2N(R5)C(O)—, —CH2OCH2CH2—, —CH2OCH2CF2—, —CH2OCH2CH(CH3)—, —CH2OCH(CH3)CH2—, —CH2OC(CH3)2CH2—, —CH2OCH2CH(CH3)CH2—, —CH2OCH2CH2O—, —CH2OCH2C(O)N(R5)— or —CH2OCH2CH2OCH2—.
Appositely, Q represents a covalent bond; or Q represents —CH2—, —CH(CN)—, —CH(OH)—, —CH(OCH3)—, —CH2O—, —CH2N(R5)— or —CH2OCH2—.
More especially, Q represents a covalent bond; or Q represents —CH2— or —CH2O—.
Particular values of Q include —CH2—, —CH(OH)—, —CH2O—, —CH2S— and —CH2OCH2—. In a first embodiment, Q represents —CH2—. In a second embodiment, Q represents —CH(OH)—. In a third embodiment, Q represents —CH2O—. In a fourth embodiment, Q represents —CH2S—. In a fifth embodiment, Q represents —CH2OCH2—.
Generally, Y represents C3-7 cycloalkyl, aryl or heteroaryl, any of which groups may be optionally substituted by one or more substituents.
Typically, Y represents aryl or heteroaryl, either of which groups may be optionally substituted by one or more substituents.
In a first embodiment, Y represents optionally substituted C3-7 cycloalkyl. In one aspect of that embodiment, Y represents unsubstituted C3-7 cycloalkyl. In another aspect of that embodiment, Y represents monosubstituted C3-7 cycloalkyl. In a further aspect of that embodiment, Y represents disubstituted C3-7 cycloalkyl.
In a second embodiment, Y represents optionally substituted aryl. In one aspect of that embodiment, Y represents unsubstituted aryl. In another aspect of that embodiment, Y represents monosubstituted aryl. In a further aspect of that embodiment, Y represents disubstituted aryl.
In a third embodiment, Y represents optionally substituted C3-7 heterocycloalkyl. In one aspect of that embodiment, Y represents unsubstituted C3-7 heterocycloalkyl. In another aspect of that embodiment, Y represents monosubstituted C3-7 heterocycloalkyl. In a further aspect of that embodiment, Y represents disubstituted C3-7 heterocycloalkyl.
In a fourth embodiment, Y represents optionally substituted heteroaryl. In one aspect of that embodiment, Y represents unsubstituted heteroaryl. In another aspect of that embodiment, Y represents monosubstituted heteroaryl. In a further aspect of that embodiment, Y represents disubstituted heteroaryl.
Suitably, Y represents benzocyclobutenyl, phenyl, thienyl, thiazolyl or pyridinyl, any of which groups may be optionally substituted by one or more substituents.
Appropriately, Y represents phenyl, thienyl or thiazolyl, any of which groups may be optionally substituted by one or more substituents.
Appositely, Y represents phenyl, which may be optionally substituted by one or more substituents.
Examples of optional substituents which may be present on the moiety Y include one, two or three substituents independently selected from halogen, cyano, nitro, C1-6 alkyl, trifluoromethyl, hydroxy, C1-6 alkoxy, difluoromethoxy, trifluoromethoxy, C1-6 alkylthio, C1-6 alkylsulfinyl, C1-6 alkylsulfonyl, (C1-6)alkylsulfonyloxy, amino, C1-6 alkylamino, di(C1-6)alkylamino, arylamino, C2-6 alkylcarbonylamino, C1-6 alkylsulfonylamino, formyl, C2-6 alkylcarbonyl, C3-6 cycloalkylcarbonyl, C3-6 heterocycloalkylcarbonyl, carboxy, C2-6 alkoxycarbonyl, aminocarbonyl, C1-6 alkylaminocarbonyl, di(C1-6)alkylaminocarbonyl, aminosulfonyl, C1-6 alkylaminosulfonyl and di(C1-6)alkylaminosulfonyl.
Typical examples of optional substituents on the moiety Y include halogen, cyano and difluoromethoxy.
Suitable examples of optional substituents on the moiety Y include halogen and difluoromethoxy, especially halogen.
Examples of particular substituents on the moiety Y include fluoro, chloro, bromo, cyano, nitro, methyl, isopropyl, trifluoromethyl, hydroxy, methoxy, difluoromethoxy, trifluoromethoxy, methylthio, methylsulfinyl, methylsulfonyl, methylsulfonyloxy, amino, methylamino, tert-butylamino, dimethylamino, phenylamino, acetylamino, methylsulfonylamino, formyl, acetyl, cyclopropylcarbonyl, azetidinylcarbonyl, pyrrolidinylcarbonyl, piperidinylcarbonyl, piperazinylcarbonyl, morpholinylcarbonyl, carboxy, methoxycarbonyl, aminocarbonyl, methylaminocarbonyl, dimethylaminocarbonyl, aminosulfonyl, methylaminosulfonyl and dimethylaminosulfonyl.
Typical examples of particular substituents on the moiety Y include fluoro, chloro, cyano and difluoromethoxy.
Suitable examples of particular substituents on the moiety Y include chloro and difluoromethoxy, especially chloro.
Typical values of Y include benzocyclobutenyl, phenyl, fluorophenyl (including 2-fluorophenyl, 3-fluorophenyl and 4-fluorophenyl), chlorophenyl (including 2-chlorophenyl, 3-chlorophenyl and 4-chlorophenyl), difluorophenyl (including 2,6-difluorophenyl), (chloro)(fluoro)phenyl (including 5-chloro-2-fluorophenyl and 2-chloro-5-fluorophenyl), dichlorophenyl (including 2,5-dichlorophenyl and 2,6-dichlorophenyl), methylphenyl (including 4-methylphenyl), dimethylphenyl (including 2,5-dimethylphenyl and 2,6-dimethylphenyl), (trifluoromethyl)phenyl [including 2-(trifluoromethyl)phenyl], (chloro)(trifluoromethyl)phenyl [including 5-chloro-2-(trifluoromethyl)phenyl], (methyl)-(trifluoromethyl)phenyl [including 2-methyl-5-(trifluoromethyl)phenyl], bis(trifluoromethyl)phenyl [including 2,5-bis(trifluoromethyl)phenyl], methoxyphenyl (including 2-methoxyphenyl), (difluoromethoxy)phenyl [including 2-(difluoromethoxy)phenyl and 3-(difluoromethoxy)phenyl], (difluoromethoxy)(fluoro)phenyl [including 2-(difluoromethoxy)-5-fluorophenyl and 2-(difluoromethoxy)-6-fluorophenyl], (chloro)(difluoromethoxy)phenyl [including 5-chloro-2-(difluoromethoxy)phenyl and 6-chloro-2-(difluoromethoxy)phenyl], (cyano)(difluoromethoxy)phenyl [including 6-cyano-2-(difluoromethoxy)phenyl], (trifluoromethoxy)phenyl [including 2-(trifluoromethoxy)-phenyl], methylsulfonyloxyphenyl, (amino)(chloro)phenyl (including 5-amino-2-chlorophenyl), methylthienyl (including 3-methylthien-2-yl), methylthiazolyl (including 2-methyl-1,3-thiazol-4-yl), (chloro)(methyl)thiazolyl (including 5-chloro-2-methyl-1,3-thiazol-4-yl), dimethylthiazolyl (including 2,4-dimethyl-1,3-thiazol-5-yl) and pyridinyl (including pyridin-3-yl and pyridin-4-yl).
Selected values of Y include dichlorophenyl, dimethylphenyl, (difluoromethoxy)-phenyl, (difluoromethoxy)(fluoro)phenyl, methylsulfonyloxyphenyl, methylthienyl and dimethylthiazolyl.
Illustrative values of Y include dichlorophenyl and (difluoromethoxy)phenyl.
In one embodiment, Y represents 2,5-dichlorophenyl.
In another embodiment, Y represents 2,5-dimethylphenyl.
In a particular embodiment, Y represents 2-(difluoromethoxy)phenyl.
In another embodiment, Y represents (difluoromethoxy)(fluoro)phenyl.
In another embodiment, Y represents 3-methylthien-2-yl.
In another embodiment, Y represents 2,4-dimethyl-1,3-thiazol-5-yl.
In one embodiment, Z represents hydrogen.
In another embodiment, Z is other than hydrogen.
In a selected embodiment, Z represents hydrogen; or Z represents C1-6 alkyl, C3-7 cycloalkyl, aryl, C3-7 heterocycloalkyl, C3-7 heterocycloalkenyl or heteroaryl, any of which groups may be optionally substituted by one or more substituents; or Z represents —Z1-Z2 or —Z1—C(O)—Z2, either of which moieties may be optionally substituted by one or more substituents.
In a further embodiment, Z represents C1-6 alkyl, C3-7 cycloalkyl, aryl, C3-7 heterocycloalkyl, C3-7 heterocycloalkenyl or heteroaryl, any of which groups may be optionally substituted by one or more substituents; or Z represents —Z1-Z2 or —Z1—C(O)—Z2, either of which moieties may be optionally substituted by one or more substituents.
Suitably, Z represents hydrogen; or Z represents C1-6 alkyl, aryl or heteroaryl, any of which groups may be optionally substituted by one or more substituents; or Z represents —Z1-Z2, which moiety may be optionally substituted by one or more substituents.
Typically, Z represents hydrogen, fluoro or trifluoromethyl; or Z represents methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, phenyl, tetrahydrofuranyl, pyrrolidinyl, indolinyl, tetrahydropyranyl, piperidinyl, 1,2,3,4-tetrahydroquinolinyl, morpholinyl, azocanyl, thiazolinyl, furyl, thienyl, pyrazolyl, 4,5,6,7-tetrahydroindazolyl, benzoxazolyl, isoxazolyl, thiazolyl, benzothiazolyl, imidazolyl, benzimidazolyl, [1,2,4]triazolo[1,5-a]-pyrimidinyl, tetrazolyl, pyridinyl, quinolinyl, isoquinolinyl, phthalazinyl, pyrimidinyl or pyrazinyl, any of which groups may be optionally substituted by one or more substituents; or Z represents —Z1-Z2 or —Z1—C(O)—Z2, either of which moieties may be optionally substituted by one or more substituents.
Appositely, Z represents hydrogen; or Z represents methyl, phenyl or pyridinyl, any of which groups may be optionally substituted by one or more substituents.
The moiety Z1 represents a divalent radical derived from an aryl, C3-7 heterocycloalkyl or heteroaryl group, any of which groups may be optionally substituted by one or more substituents. Typically, the moiety Z1 represents a divalent radical derived from a phenyl, pyrrolidinyl, piperazinyl, pyrazolyl, thiazolyl, triazolyl, tetrazolyl or pyridinyl group, any of which groups may be optionally substituted by one or more substituents. Typical values of the moiety Z1 include the groups of formula (Za), (Zb), (Zc), (Zd), (Ze), (Zf), (Zg), (Zh), (Zj) and (Zk):




wherein

the symbols # represent the points of attachment of the moiety Z1 to the remainder of the molecule; and
the asterisks (*) represent the site of attachment of optional substituents.
Particular values of the moiety Z1 include the groups of formula (Za), (Zc), (Ze), (Zf), (Zg), (Zh) and (Zj) as depicted above.
The moiety Z2 represents aryl, C3-7 heterocycloalkyl, C3-7 heterocycloalkenyl or heteroaryl, any of which groups may be optionally substituted by one or more substituents. Typically, Z2 represents phenyl, pyrrolidinyl, oxazolidinyl, imidazolidinyl, morpholinyl, imidazolinyl, thiazolyl, imidazolyl, tetrazolyl or pyridinyl, any of which groups may be optionally substituted by one or more substituents.
Examples of optional substituents which may be present on the moiety Z, Z1 or Z2 include one, two or three substituents independently selected from halogen, cyano, nitro, C1-6 alkyl, trifluoromethyl, oxo, hydroxy, hydroxy(C1-6)alkyl, C1-6 alkoxy, difluoromethoxy, trifluoromethoxy, C1-3 alkylenedioxy, C1-6 alkylthio, C1-6 alkylsulfinyl, C1-6 alkylsulfonyl, amino, C1-6 alkylamino, di(C1-6)alkylamino, di(C1-6)alkylamino(C1-6)alkyl, C2-6 alkylcarbonylamino, C1-6 alkylsulfonylamino, formyl, C2-6 alkylcarbonyl, carboxy, C2-6 alkoxycarbonyl, aminocarbonyl, C1-6 alkylaminocarbonyl, di(C1-6)alkylaminocarbonyl, aminosulfonyl, C1-6 alkylaminosulfonyl, di(C1-6)alkylaminosulfonyl, aminocarbonylamino and hydrazinocarbonyl.
Typical examples of optional substituents on Z, Z1 or Z2 include one, two or three substituents independently selected from C1-6 alkoxy and aminocarbonyl.
Examples of particular substituents on the moiety Z, Z1 or Z2 include fluoro, chloro, bromo, cyano, nitro, methyl, ethyl, isopropyl, trifluoromethyl, oxo, hydroxy, hydroxymethyl, methoxy, difluoromethoxy, trifluoromethoxy, methylenedioxy, methylthio, methylsulfinyl, methylsulfonyl, amino, methylamino, tert-butylamino, dimethylamino, dimethylaminomethyl, dimethylaminoethyl, acetylamino, methylsulfonylamino, formyl, acetyl, carboxy, methoxycarbonyl, tert-butoxycarbonyl, aminocarbonyl, methylaminocarbonyl, dimethylaminocarbonyl, aminosulfonyl, methylaminosulfonyl, dimethylaminosulfonyl, aminocarbonylamino and hydrazinocarbonyl.
Typical examples of particular substituents on Z, Z1 or Z2 include one, two or three substituents independently selected from methoxy and aminocarbonyl.
Typical values of Z2 include phenyl, hydroxyphenyl, oxopyrrolidinyl, dioxo-pyrrolidinyl, (hydroxy)(oxo)pyrrolidinyl, (amino)(oxo)pyrrolidinyl, (oxo)oxazolidinyl, oxoimidazolidinyl, morpholinyl, imidazolinyl, methylthiazolyl, formylthiazolyl, imidazolyl, tetrazolyl and pyridinyl.
Selected values of Z2 include oxopyrrolidinyl and (oxo)oxazolidinyl. In one embodiment, Z2 represents oxopyrrolidinyl. In another embodiment, Z2 represents (oxo)oxazolidinyl.
Typical values of Z include hydrogen, fluoro, trifluoromethyl, methyl, ethyl, n-propyl, isopropyl, isobutyl, tert-butyl, cyclopropyl, cyclopentyl, cyclohexyl, oxo-cyclohexyl, phenyl, bromophenyl, cyanophenyl, nitrophenyl, methoxyphenyl, difluoromethoxyphenyl, trifluoromethoxyphenyl, methylenedioxyphenyl, methylsulfonylphenyl, dimethylaminophenyl, acetylaminophenyl, methylsulfonylaminophenyl, carboxyphenyl, aminocarbonylphenyl, methylaminocarbonylphenyl, dimethylaminocarbonylphenyl, aminocarbonylaminophenyl, tetrahydrofuranyl, oxopyrrolidinyl, dimethylamino-pyrrolidinyl, tert-butoxycarbonylpyrrolidinyl, indolinyl, tetrahydropyranyl, piperidinyl, ethylpiperidinyl, tert-butoxycarbonylpiperidinyl, aminocarbonylpiperidinyl, 2-oxo-3,4-dihydroquinolinyl, morpholinyl, azocanyl, oxothiazolinyl, furyl, hydroxymethylfuryl, thienyl, methylpyrazolyl, dimethylpyrazolyl, 4,5,6,7-tetrahydroindazolyl, benzoxazolyl, methylisoxazolyl, dimethylisoxazolyl, methylthiazolyl, aminothiazolyl, benzothiazolyl, methylbenzothiazolyl, aminobenzothiazolyl, imidazolyl, methylimidazolyl, methyl-benzimidazolyl, dimethyl[1,2,4]triazolo[1,5-a]pyrimidinyl, dimethylaminoethyltetrazolyl, pyridinyl, fluoropyridinyl, chloropyridinyl, cyanopyridinyl, methylpyridinyl, (cyano)-(methyl)pyridinyl, trifluoromethylpyridinyl, oxopyridinyl, methoxypyridinyl, methylsulfonylpyridinyl, dimethylaminomethylpyridinyl, acetylaminopyridinyl, carboxy-pyridinyl, methoxycarbonylpyridinyl, aminocarbonylpyridinyl, (aminocarbonyl)(fluoro)-pyridinyl, methylaminocarbonylpyridinyl, dimethylaminocarbonylpyridinyl, hydrazino-carbonylpyridinyl, quinolinyl, isoquinolinyl, (methyl)(oxo)phthalazinyl, pyrimidinyl, pyrazinyl, oxopyrrolidinylphenyl, dioxopyrrolidinylphenyl, (hydroxy)(oxo)pyrrolidinylphenyl, (amino)(oxo)pyrrolidinylphenyl, (oxo)oxazolidinylphenyl, oxoimidazolidinyl-phenyl, imidazolinylphenyl, methylthiazolylphenyl, formylthiazolylphenyl, imidazolyl-phenyl, tetrazolylphenyl, phenylpyrrolidinyl, hydroxyphenylpiperazinyl, (methyl)-(phenyl)pyrazolyl, oxoimidazolidinylthiazolyl, hydroxyphenyltriazolyl, morpholinyl-tetrazolyl, oxopyrrolidinylpyridinyl, (oxo)oxazolidinylpyridinyl, oxoimidazolidinyl-pyridinyl, pyridinylthiazolyl, pyridinyltetrazolyl and morpholinylcarbonylphenyl.
Particular values of Z include hydrogen, methyl, methylsulfonylphenyl, aminocarbonylphenyl, pyridinyl, methoxypyridinyl, methylsulfonylpyridinyl, oxopyrrolidinylphenyl, (hydroxy)(oxo)pyrrolidinylphenyl and (oxo)oxazolidinylphenyl.
Selected values of Z include hydrogen, methyl, aminocarbonylphenyl, pyridinyl and methoxypyridinyl.
In a first embodiment, Z represents hydrogen. In a second embodiment, Z represents methyl. In a third embodiment, Z represents methylsulfonylphenyl. In one aspect of that embodiment, Z represents 3-(methylsulfonyl)phenyl. In another aspect of that embodiment, Z represents 4-(methylsulfonyl)phenyl. In a fourth embodiment, Z represents aminocarbonylphenyl. In one aspect of that embodiment, Z represents 4-(aminocarbonyl)phenyl. In a fifth embodiment, Z represents pyridinyl. In one aspect of that embodiment, Z represents pyridin-3-yl. In another aspect of that embodiment, Z represents pyridin-4-yl. In a sixth embodiment, Z represents methoxypyridinyl. In one aspect of that embodiment, Z represents 6-methoxypyridin-3-yl. In a seventh embodiment, Z represents methylsulfonylpyridinyl. In an eighth embodiment, Z represents oxopyrrolidinylphenyl. In one aspect of that embodiment, Z represents 3-(2-oxopyrrolidin-1-yl)phenyl. In a ninth embodiment, Z represents (hydroxy)(oxo)-pyrrolidinylphenyl. In one aspect of that embodiment, Z represents 3-(3-hydroxy-2-oxopyrrolidin-1-yl)phenyl. In another aspect of that embodiment, Z represents 3-(4-hydroxy-2-oxopyrrolidin-1-yl)phenyl. In a tenth embodiment, Z represents (oxo)-oxazolidinylphenyl. In one aspect of that embodiment, Z represents 3-(2-oxo-oxazolidinyl-3-yl)phenyl.
Suitably, R1, R2 or R3 independently represent hydrogen, halogen, cyano, trifluoromethyl or —CO2Rd; or C1-6 alkyl, C2-6 alkynyl, aryl, C3-7 heterocycloalkyl, C3-7 heterocycloalkenyl, heteroaryl, (C3-7)heterocycloalkyl(C1-6)alkyl-aryl-, heteroaryl-(C3-7)heterocycloalkyl-, (C3-7)cycloalkyl-heteroaryl-, (C3-7)cycloalkyl(C1-6)alkyl-heteroaryl-, (C4-7)cycloalkenyl-heteroaryl-, (C4-9)bicycloalkyl-heteroaryl-, (C3-7)heterocycloalkyl-heteroaryl-, (C3-7)heterocycloalkyl(C1-6)alkyl-heteroaryl-, (C3-7)heterocycloalkenyl-heteroaryl-, (C4-9)heterobicycloalkyl-heteroaryl- or (C4-9)spiroheterocycloalkyl-heteroaryl-, any of which groups may be optionally substituted by one or more substituents.
Examples of optional substituents which may be present on R1, R2 or R3 include one, two or three substituents independently selected from halogen, halo(C1-6)alkyl, cyano, cyano(C1-6)alkyl, nitro, nitro(C1-6)alkyl, C1-6 alkyl, difluoromethyl, trifluoromethyl, difluoroethyl, trifluoroethyl, C2-6 alkenyl, hydroxy, hydroxy(C1-6)alkyl, C1-6 alkoxy, difluoromethoxy, trifluoromethoxy, trifluoroethoxy, carboxy(C3-7)cycloalkyloxy, C1-3 alkylenedioxy, C1-6 alkoxy(C1-6)alkyl, C1-6 alkylthio, C1-6 alkylsulphinyl, C1-6 alkylsulphonyl, (C1-6)alkylsulphonyl(C1-6)alkyl, oxo, amino, amino(C1-6)alkyl, C1-6 alkylamino, di(C1-6)alkylamino, hydroxy(C1-6)alkylamino, C1-6 alkoxyamino, (C1-6)alkoxy(C1-6)alkylamino, [(C1-6)alkoxy](hydroxy)(C1-6)alkylamino, [(C1-6)alkylthio](hydroxy)(C1-6)alkylamino, N—[(C1-6)alkyl]-N-[hydroxy(C1-6)alkyl]amino, di(C1-6)alkylamino(C1-6)alkylamino, N-[di(C1-6)alkylamino(C1-6)alkyl]-N-[hydroxy(C1-6)alkyl]amino, hydroxy(C1-6)alkyl-(C3-7)cycloalkylamino, (hydroxy)[(C3-7)cycloalkyl(C1-6)alkyl]amino, (C3-7)heterocycloalkyl(C1-6)alkylamino, oxo(C3-7)heterocycloalkyl(C1-6)alkylamino, (C1-6)alkylheteroarylamino, heteroaryl(C1-6)alkylamino, (C1-6)alkylheteroaryl(C1-6)alkylamino, C2-6 alkylcarbonylamino, N—[(C1-6)alkyl]-N—[(C2-6)alkylcarbonyl]amino, (C2-6)alkylcarbonylamino(C1-6)alkyl, C3-6 alkenylcarbonylamino, bis[(C3-6)alkenylcarbonyl]amino, N—[(C1-6)alkyl]-N—[(C3-7)cycloalkylcarbonyl]amino, C2-6 alkoxycarbonylamino, C2-6 alkoxycarbonyl(C1-6)alkylamino, C1-6 alkylaminocarbonylamino, C1-6 alkylsulphonylamino, N—[(C1-6)alkyl]-N—[(C1-6)alkylsulphonyl]amino, bis[(C1-6)alkylsulphonyl]amino, N—[(C1-6)alkyl]-N-[carboxy(C1-6)alkyl]amino, carboxy(C3-7)cycloalkylamino, carboxy-(C3-7)cycloalkyl(C1-6)alkylamino, formyl, C2-6 alkylcarbonyl, (C3-7)cycloalkylcarbonyl, phenylcarbonyl, (C2-6)alkylcarbonyloxy(C1-6)alkyl, carboxy, carboxy(C1-6)alkyl, C2-6 alkoxycarbonyl, C2-6 alkoxycarbonyl(C1-6)alkyl, morpholinyl(C1-6)alkoxycarbonyl, C2-6 alkoxycarbonylmethylidenyl, a carboxylic acid isostere or prodrug moiety Ω, —(C1-6)alkyl-Ω, aminocarbonyl, C1-6 alkylaminocarbonyl, hydroxy(C1-6)alkylaminocarbonyl, di(C1-6)alkylaminocarbonyl, aminocarbonyl(C1-6)alkyl, aminosulphonyl, di(C1-6)alkylaminosulphonyl, (C1-6)alkylsulphoximinyl and [(C1-6)alkyl][N—(C1-6)alkyl]-sulphoximinyl.
By the expression “carboxylic acid isostere or prodrug moiety” is meant any functional group, structurally distinct from a carboxylic acid moiety, that will be recognised by a biological system as being similar to, and thus capable of mimicking, a carboxylic acid moiety, or will be readily convertible by a biological system in vivo into a carboxylic acid moiety. A synopsis of some common carboxylic acid isosteres is presented by N. A. Meanwell in J. Med. Chem., 2011, 54, 2529-2591 (cf. in particular FIGS. 25 and 26). An alternative carboxylic acid isostere is described by N Pemberton et al. in ACS Med. Chem. Lett., 2012, 3, 574-578. Typical examples of suitable carboxylic acid isostere or prodrug moieties represented by Ω include the functional groups of formula (i) to (xliii)
















wherein

the asterisk (*) represents the site of attachment to the remainder of the molecule;
n is zero, 1 or 2;
X represents oxygen or sulphur;
Rf represents hydrogen, C1-6 alkyl or —CH2CH(OH)CH2OH;
Rg represents C1-6 alkyl, trifluoromethyl, —CH2CH2F, —CH2CHF2, —CH2CF3 or —CF2CF3;
Rh represents hydrogen, cyano or —CO2Rd, in which Rd is as defined above; and
Rj represents hydrogen or halogen.
In one embodiment, n is zero. In another embodiment, n is 1. In a further embodiment, n is 2.
In one embodiment, X represents oxygen. In another embodiment, X represents sulphur.
In one embodiment, Rf represents hydrogen. In another embodiment, Rf represents C1-6 alkyl, especially methyl. In a further embodiment, Rf is —CH2CH(OH)CH2OH.
In one embodiment, Rg represents C1-6 alkyl, especially methyl. In another embodiment, Rg represents trifluoromethyl, —CH2CH2F, —CH2CHF2, —CH2CF3 or —CF2CF3. In a first aspect of that embodiment, Rg represents trifluoromethyl. In a second aspect of that embodiment, Rg represents —CH2CH2F. In a third aspect of that embodiment, Rg represents —CH2CHF2. In a fourth aspect of that embodiment, Rg represents —CH2CF3. In a fifth aspect of that embodiment, Rg represents —CF2CF3.
In one embodiment, Rh is hydrogen. In another embodiment, Rh represents cyano. In a further embodiment, Rh represents —CO2Rd, especially methoxycarbonyl.
In one embodiment, Rj represents hydrogen. In another embodiment, Rj represents halogen, especially chloro.
In a selected embodiment, Ω represents tetrazolyl, especially a C-linked tetrazolyl moiety of formula (xxiv) or (xxv) as depicted above, in particular a group of formula (xxiv) as depicted above.
In another embodiment, Ω represents C1-6 alkylsulphonylaminocarbonyl, i.e. a moiety of formula (iii) as depicted above wherein Rg represents C1-6 alkyl.
In another embodiment, Ω represents C1-6 alkylaminosulphonyl, i.e. a moiety of formula (x) as depicted above wherein Rg represents C1-6 alkyl.
In a further embodiment, Ω represents (C1-6)alkylcarbonylaminosulphonyl, i.e. a moiety of formula (v) as depicted above wherein Rg represents C1-6 alkyl.
Examples of particular substituents on R1, R2 or R3 include fluoro, chloro, bromo, fluoromethyl, fluoroisopropyl, cyano, cyanoethyl, nitro, nitromethyl, methyl, ethyl, isopropyl, isobutyl, tert-butyl, difluoromethyl, trifluoromethyl, difluoroethyl, trifluoroethyl, ethenyl, hydroxy, hydroxymethyl, hydroxyisopropyl, methoxy, isopropoxy, difluoromethoxy, trifluoromethoxy, trifluoroethoxy, carboxycyclobutyloxy, methylenedioxy, ethylenedioxy, methoxymethyl, methoxyethyl, methylthio, methylsulphinyl, methylsulphonyl, methylsulphonylethyl, oxo, amino, aminomethyl, aminoisopropyl, methylamino, ethylamino, dimethylamino, hydroxyethylamino, hydroxypropylamino, (hydroxy)(methyl)propylamino, methoxyamino, methoxyethylamino, (hydroxy)-(methoxy)(methyl)propylamino, (hydroxy)(methylthio)butylamino, N-(hydroxyethyl)-N-(methyl)amino, dimethylaminoethylamino, (dimethylamino)(methyl)propylamino, N-(dimethylaminoethyl)-N-(hydroxyethyl)amino, hydroxymethylcyclopentylamino, hydroxycyclobutylmethylamino, (cyclopropyl)(hydroxy)propylamino, morpholinylethyl-amino, oxopyrrolidinylmethylamino, ethyloxadiazolylamino, methylthiadiazolylamino, thiazolylmethylamino, thiazolylethylamino, pyrimidinylmethylamino, methylpyrazolyl-methylamino, acetylamino, N-acetyl-N-methylamino, N-isopropylcarbonyl-N-methylamino, acetylaminomethyl, ethenylcarbonylamino, bis(ethenylcarbonyl)amino, N-cyclopropylcarbonyl-N-methylamino, methoxycarbonylamino, ethoxycarbonylamino, tert-butoxycarbonylamino, methoxycarbonylethylamino, ethylaminocarbonylamino, butylaminocarbonylamino, methylsulphonylamino, N-methyl-N-(methylsulphonyl)amino, bis(methylsulphonyl)amino, N-(carboxymethyl)-N-methylamino, N-(carboxyethyl)-N-methylamino, carboxycyclopentylamino, carboxycyclopropylmethylamino, formyl, acetyl, isopropylcarbonyl, cyclobutylcarbonyl, phenylcarbonyl, acetoxyisopropyl, carboxy, carboxymethyl, carboxyethyl, methoxycarbonyl, ethoxycarbonyl, n-butoxycarbonyl, tert-butoxycarbonyl, methoxycarbonylmethyl, ethoxycarbonylmethyl, ethoxycarbonylethyl, morpholinylethoxycarbonyl, ethoxycarbonylmethylidenyl, methylsulphonylamino-carbonyl, acetylaminosulphonyl, methoxyaminocarbonyl, tetrazolyl, tetrazolylmethyl, hydroxyoxadiazolyl, aminocarbonyl, methylaminocarbonyl, hydroxyethylaminocarbonyl, dimethylaminocarbonyl, aminocarbonylmethyl, aminosulphonyl, methylaminosulphonyl, dimethylaminosulphonyl, methylsulphoximinyl and (methyl)(N-methyl)sulphoximinyl.
Typically, R1 represents hydrogen, halogen, trifluoromethyl or —ORa; or R1 represents optionally substituted C1-6 alkyl.
Typical examples of optional substituents on R1 include C2-6 alkoxycarbonyl.
Typical examples of particular substituents on R1 include ethoxycarbonyl.
In a first embodiment, R1 represents hydrogen. In a second embodiment, R1 represents halogen. In one aspect of that embodiment, R1 represents fluoro. In another aspect of that embodiment, R1 represents chloro. In a third embodiment, R1 represents trifluoromethyl. In a fourth embodiment, R1 represents —ORa. In a fifth embodiment, R1 represents optionally substituted C1-6 alkyl. In one aspect of that embodiment, R1 represents unsubstituted methyl. In another aspect of that embodiment, R1 represents unsubstituted ethyl. In a further aspect of that embodiment, R1 represents monosubstituted methyl or monosubstituted ethyl.
Typical values of R1 include hydrogen, fluoro, chloro, trifluoromethyl, —ORa, methyl and ethoxycarbonylethyl.
Typically, R2 represents hydrogen, halogen or C1-6 alkyl.
In a first embodiment, R2 represents hydrogen. In a second embodiment, R2 represents halogen. In one aspect of that embodiment, R2 represents fluoro. In a third embodiment, R2 represents C1-6 alkyl. In one aspect of that embodiment, R2 represents methyl. In another aspect of that embodiment, R2 represents ethyl.
In a particular embodiment, R3 represents hydrogen.
Suitably, R4 represents hydrogen or methyl.
In a first embodiment, R4 represents hydrogen. In a second embodiment, R4 represents C1-6 alkyl, especially methyl.
Suitably, R5 represents hydrogen, methyl or ethyl.
In a first embodiment, R5 represents hydrogen. In a second embodiment, R5 represents C1-6 alkyl, especially methyl or ethyl. In one aspect of that embodiment, R5 represents methyl. In another aspect of that embodiment, R5 represents ethyl.
Typical examples of suitable substituents on Ra, Rb, Rc, Rd or Re, or on the heterocyclic moiety —NRbRc, include halogen, C1-6 alkyl, C1-6 alkoxy, difluoromethoxy, trifluoromethoxy, C1-6 alkoxy(C1-6)alkyl, C1-6 alkylthio, C1-6 alkylsulphinyl, C1-6 alkylsulphonyl, hydroxy, hydroxy(C1-6)alkyl, amino(C1-6)alkyl, cyano, trifluoromethyl, oxo, C2-6 alkylcarbonyl, carboxy, C2-6 alkoxycarbonyl, C2-6 alkylcarbonyloxy, amino, C1-6 alkylamino, di(C1-6)alkylamino, phenylamino, pyridinylamino, C2-6 alkylcarbonylamino, C2-6 alkylcarbonylamino(C1-6)alkyl, C2-6 alkoxycarbonylamino, C1-6 alkylsulphonylamino, aminocarbonyl, C1-6 alkylaminocarbonyl and di(C1-6)alkylaminocarbonyl.
Typical examples of specific substituents on Ra, Rb, Rc, Rd or Re, or on the heterocyclic moiety —NRbRc, include fluoro, chloro, bromo, methyl, ethyl, isopropyl, methoxy, isopropoxy, difluoromethoxy, trifluoromethoxy, methoxymethyl, methylthio, ethylthio, methylsulphinyl, methylsulphonyl, hydroxy, hydroxymethyl, hydroxyethyl, aminomethyl, cyano, trifluoromethyl, oxo, acetyl, carboxy, methoxycarbonyl, ethoxycarbonyl, tert-butoxycarbonyl, acetoxy, amino, methylamino, ethylamino, dimethylamino, phenylamino, pyridinylamino, acetylamino, tert-butoxycarbonylamino, acetylaminomethyl, methylsulphonylamino, aminocarbonyl, methylaminocarbonyl and dimethylaminocarbonyl.
Suitably, Ra represents C1-6 alkyl, aryl(C1-6)alkyl or heteroaryl(C1-6)alkyl, any of which groups may be optionally substituted by one or more substituents.
Selected values of Ra include methyl, ethyl, benzyl and isoindolylpropyl, any of which groups may be optionally substituted by one or more substituents.
Selected examples of suitable substituents on Ra include C1-6 alkoxy and oxo.
Selected examples of specific substituents on Ra include methoxy and oxo.
In one embodiment, Ra represents optionally substituted C1-6 alkyl. In one aspect of that embodiment, Ra ideally represents unsubstituted C1-6 alkyl, especially methyl. In another aspect of that embodiment, Ra ideally represents substituted C1-6 alkyl, e.g. methoxyethyl. In another embodiment, Ra represents optionally substituted aryl. In one aspect of that embodiment, Ra represents unsubstituted aryl, especially phenyl. In another aspect of that embodiment, Ra represents monosubstituted aryl, especially methylphenyl. In another embodiment, Ra represents optionally substituted aryl(C1-6)alkyl, ideally unsubstituted aryl(C1-6)alkyl, especially benzyl. In a further embodiment, Ra represents optionally substituted heteroaryl. In a further embodiment, Ra represents optionally substituted heteroaryl(C1-6)alkyl, e.g. dioxoisoindolylpropyl.
Specific values of Ra include methyl, methoxyethyl, benzyl and dioxoisoindolylpropyl.
In a particular aspect, Rb represents hydrogen or trifluoromethyl; or C1-6 alkyl, C3-7 cycloalkyl, C3-7 cycloalkyl(C1-6)alkyl, aryl, aryl(C1-6)alkyl, C3-7 heterocycloalkyl, C3-7 heterocycloalkyl(C1-6)alkyl, heteroaryl or heteroaryl(C1-6)alkyl, any of which groups may be optionally substituted by one or more substituents.
Selected values of Rb include hydrogen; or C1-6 alkyl, aryl(C1-6)alkyl, C3-7 heterocycloalkyl or C3-7 heterocycloalkyl(C1-6)alkyl, any of which groups may be optionally substituted by one or more substituents.
Typical values of Rb include hydrogen and C1-6 alkyl.
Illustratively, Rb represents hydrogen or trifluoromethyl; or methyl, ethyl, n-propyl, isopropyl, n-butyl, 2-methylpropyl, tert-butyl, pentyl, hexyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cyclopropylmethyl, cyclobutylmethyl, cyclopentylmethyl, cyclohexylmethyl, phenyl, benzyl, phenylethyl, azetidinyl, tetrahydrofuryl, tetrahydrothienyl, pyrrolidinyl, piperidinyl, homopiperidinyl, morpholinyl, azetidinylmethyl, tetrahydrofurylmethyl, pyrrolidinylmethyl, pyrrolidinylethyl, pyrrolidinylpropyl, thiazolidinylmethyl, imidazolidinylethyl, piperidinylmethyl, piperidinylethyl, tetrahydroquinolinylmethyl, piperazinylpropyl, morpholinylmethyl, morpholinylethyl, morpholinylpropyl, pyridinyl, indolylmethyl, pyrazolylmethyl, pyrazolylethyl, imidazolylmethyl, imidazolylethyl, benzimidazolylmethyl, triazolylmethyl, pyridinylmethyl or pyridinylethyl, any of which groups may be optionally substituted by one or more substituents.
Representative values of Rb include hydrogen; or methyl, ethyl, n-propyl, benzyl, pyrrolidinyl or morpholinylpropyl, any of which groups may be optionally substituted by one or more substituents.
Selected examples of suitable substituents on Rb include C1-6 alkoxy, C1-6 alkylthio, C1-6 alkylsulphinyl, C1-6 alkylsulphonyl, hydroxy, cyano, C2-6 alkoxycarbonyl, di-(C1-6)alkylamino and C2-6 alkoxycarbonylamino.
Selected examples of specific substituents on Rb include methoxy, methylthio, methylsulphinyl, methylsulphonyl, hydroxy, cyano, tert-butoxycarbonyl, dimethylamino and tert-butoxycarbonylamino.
Specific values of Rb include hydrogen, methyl, methoxyethyl, methylthioethyl, methylsulphinylethyl, methylsulphonylethyl, hydroxyethyl, cyanoethyl, dimethylaminoethyl, tert-butoxycarbonylaminoethyl, dihydroxypropyl, benzyl, pyrrolidinyl, tert-butoxycarbonylpyrrolidinyl and morpholinylpropyl.
In one embodiment, Rb represents hydrogen. In another embodiment, Rb represents C1-6 alkyl, especially methyl.
Selected values of Rc include hydrogen; or C1-6 alkyl, C3-7 cycloalkyl or C3-7 heterocycloalkyl, any of which groups may be optionally substituted by one or more substituents.
In a particular aspect, Rc represents hydrogen, C1-6 alkyl or C3-7 cycloalkyl.
Representative values of Rc include hydrogen; or methyl, cyclobutyl, cyclopentyl, cyclohexyl, tetrahydropyranyl and piperidinyl, any of which groups may be optionally substituted by one or more substituents.
Selected examples of suitable substituents on Rc include C2-6 alkylcarbonyl and C2-6 alkoxycarbonyl.
Selected examples of specific substituents on Rc include acetyl and tert-butoxycarbonyl.
Specific values of Rc include hydrogen, methyl, cyclobutyl, cyclopentyl, cyclohexyl, tetrahydropyranyl, acetylpiperidinyl and tert-butoxycarbonylpiperidinyl,
Suitably, Rc represents hydrogen or C1-6 alkyl. In one embodiment, Rc is hydrogen. In another embodiment, Rc represents C1-6 alkyl, especially methyl or ethyl, particularly methyl. In a further embodiment, Rc represents C3-7 cycloalkyl, e.g. cyclopropyl, cyclobutyl, cyclopentyl or cyclohexyl.
Alternatively, the moiety —NRbRc may suitably represent azetidin-1-yl, pyrrolidin-1-yl, oxazolidin-3-yl, isoxazolidin-2-yl, thiazolidin-3-yl, isothiazolidin-2-yl, piperidin-1-yl, morpholin-4-yl, thiomorpholin-4-yl, piperazin-1-yl, homopiperidin-1-yl, homomorpholin-4-yl or homopiperazin-1-yl, any of which groups may be optionally substituted by one or more substituents.
Selected examples of suitable substituents on the heterocyclic moiety —NRbRc include C1-6 alkyl, C1-6 alkylsulphonyl, hydroxy, hydroxy(C1-6)alkyl, amino(C1-6)alkyl, cyano, oxo, C2-6 alkylcarbonyl, carboxy, C2-6 alkoxycarbonyl, amino, C2-6 alkylcarbonylamino, C2-6 alkylcarbonylamino(C1-6)alkyl, C2-6 alkoxycarbonylamino, C1-6 alkylsulphonylamino and aminocarbonyl.
Selected examples of specific substituents on the heterocyclic moiety —NRbRc include methyl, methylsulphonyl, hydroxy, hydroxymethyl, aminomethyl, cyano, oxo, acetyl, carboxy, ethoxycarbonyl, amino, acetylamino, acetylaminomethyl, tert-butoxycarbonylamino, methylsulphonylamino and aminocarbonyl.
Specific values of the moiety —NRbRc include azetidin-1-yl, hydroxyazetidin-1-yl, hydroxymethylazetidin-1-yl, (hydroxy)(hydroxymethyl)azetidin-1-yl, aminomethyl-azetidin-1-yl, cyanoazetidin-1-yl, carboxyazetidin-1-yl, aminoazetidin-1-yl, aminocarbonylazetidin-1-yl, pyrrolidin-1-yl, aminomethylpyrrolidin-1-yl, oxopyrrolidin-1-yl, acetylaminomethylpyrrolidin-1-yl, tert-butoxycarbonylaminopyrrolidin-1-yl, oxooxazolidin-3-yl, hydroxyisoxazolidin-2-yl, thiazolidin-3-yl, oxothiazolidin-3-yl, dioxo-isothiazolidin-2-yl, piperidin-1-yl, hydroxypiperidin-1-yl, hydroxymethylpiperidin-1-yl, aminopiperidin-1-yl, acetylaminopiperidin-1-yl, tert-butoxycarbonylaminopiperidin-1-yl, methylsulphonylaminopiperidin-1-yl, morpholin-4-yl, piperazin-1-yl, methylpiperazin-1-yl, methylsulphonylpiperazin-1-yl, oxopiperazin-1-yl, acetylpiperazin-1-yl, ethoxycarbonylpiperazin-1-yl and oxohomopiperazin-1-yl.
Suitably, Rd represents hydrogen; or C1-6 alkyl, aryl or heteroaryl, any of which groups may be optionally substituted by one or more substituents.
Selected examples of suitable values for Rd include hydrogen, methyl, ethyl, isopropyl, 2-methylpropyl, tert-butyl, cyclopropyl, cyclobutyl, phenyl, thiazolidinyl, thienyl, imidazolyl and thiazolyl, any of which groups may be optionally substituted by one or more substituents.
Selected examples of suitable substituents on Rd include halogen, C1-6 alkyl, C1-6 alkoxy, oxo, C2-6 alkylcarbonyloxy and di(C1-6)alkylamino.
Selected examples of particular substituents on Rd include fluoro, methyl, methoxy, oxo, acetoxy and dimethylamino.
In one embodiment, Rd represents hydrogen. In another embodiment, Rd represents optionally substituted C1-6 alkyl. In one aspect of that embodiment, Rd ideally represents unsubstituted C1-6 alkyl, e.g. methyl, ethyl, isopropyl, 2-methylpropyl or tert-butyl, especially methyl. In another aspect of that embodiment, Rd ideally represents substituted C1-6 alkyl, e.g. substituted methyl or substituted ethyl, including acetoxymethyl, dimethylaminomethyl and trifluoroethyl. In another embodiment, Rd represents optionally substituted aryl. In one aspect of that embodiment, Rd represents unsubstituted aryl, especially phenyl. In another aspect of that embodiment, Rd represents monosubstituted aryl, especially methylphenyl. In a further aspect of that embodiment, Rd represents disubstituted aryl, e.g. dimethoxyphenyl. In a further embodiment, Rd represents optionally substituted heteroaryl, e.g. thienyl, chlorothienyl, methylthienyl, methylimidazolyl or thiazolyl. In another embodiment, Rd represents optionally substituted C3-7 cycloalkyl, e.g. cyclopropyl or cyclobutyl. In a further embodiment, Rd represents optionally substituted C3-7 heterocycloalkyl, e.g. thiazolidinyl or oxothiazolidinyl.
Selected examples of specific values for Rd include hydrogen, methyl, acetoxymethyl, dimethylaminomethyl, ethyl, trifluoroethyl, isopropyl, 2-methylpropyl, tert-butyl, cyclopropyl, cyclobutyl, phenyl, dimethoxyphenyl, thiazolidinyl, oxothiazolidinyl, thienyl, chlorothienyl, methylthienyl, methylimidazolyl and thiazolyl.
Suitably, Re represents C1-6 alkyl or aryl, either of which groups may be optionally substituted by one or more substituents.
Selected examples of suitable substituents on Re include C1-6 alkyl, especially methyl.
In one embodiment, Re represents optionally substituted C1-6 alkyl, ideally unsubstituted C1-6 alkyl, e.g. methyl or propyl, especially methyl. In another embodiment, Re represents optionally substituted aryl. In one aspect of that embodiment, Re represents unsubstituted aryl, especially phenyl. In another aspect of that embodiment, Re represents monosubstituted aryl, especially methylphenyl. In a further embodiment, Re represents optionally substituted heteroaryl.
Selected values of Re include methyl, propyl and methylphenyl.
One sub-class of compounds according to the invention is represented by the compounds of formula (IIA) and N-oxides thereof, and pharmaceutically acceptable salts and solvates thereof, and glucuronide derivatives thereof, and co-crystals thereof:




wherein

R11 represents hydrogen, halogen, trifluoromethyl or optionally substituted C1-6 alkyl;
R15 and R16 independently represent hydrogen, halogen, cyano, nitro, C1-6 alkyl, trifluoromethyl, hydroxy, C1-6 alkoxy, difluoromethoxy, trifluoromethoxy, C1-6 alkylthio, C1-6 alkylsulfinyl, C1-6 alkylsulfonyl, amino, C1-6 alkylamino, di(C1-6)alkylamino, arylamino, C2-6 alkylcarbonylamino, C1-6 alkylsulfonylamino, formyl, C2-6 alkylcarbonyl, C3-6 cycloalkylcarbonyl, C3-6 heterocycloalkylcarbonyl, carboxy, C2-6 alkoxycarbonyl, aminocarbonyl, C1-6 alkylaminocarbonyl, di(C1-6)alkylaminocarbonyl, aminosulfonyl, C1-6 alkylaminosulfonyl or di(C1-6)alkylaminosulfonyl; and
E, Q and Z are as defined above.
Typical examples of optional substituents on R11 include C2-6 alkoxycarbonyl.
Typical examples of particular substituents on R11 include ethoxycarbonyl.
In a first embodiment, R11 represents hydrogen. In a second embodiment, R11 represents halogen. In one aspect of that embodiment, R11 represents fluoro. In another aspect of that embodiment, R11 represents chloro. In a third embodiment, R11 represents trifluoromethyl. In a fourth embodiment, R11 represents optionally substituted C1-6 alkyl. In one aspect of that embodiment, R11 represents unsubstituted methyl. In another aspect of that embodiment, R11 represents unsubstituted ethyl. In a further aspect of that embodiment, R11 represents monosubstituted methyl or monosubstituted ethyl.
Typical values of R11 include hydrogen, fluoro, chloro, trifluoromethyl, methyl and ethoxycarbonylethyl.
Typically, R15 and R16 may independently represent hydrogen, fluoro, chloro, bromo, cyano, nitro, methyl, isopropyl, trifluoromethyl, hydroxy, methoxy, difluoromethoxy, trifluoromethoxy, methylthio, methylsulfinyl, methylsulfonyl, amino, methylamino, tert-butylamino, dimethylamino, phenylamino, acetylamino, methylsulfonylamino, formyl, acetyl, cyclopropylcarbonyl, azetidinylcarbonyl, pyrrolidinylcarbonyl, piperidinylcarbonyl, piperazinylcarbonyl, morpholinylcarbonyl, carboxy, methoxycarbonyl, aminocarbonyl, methylaminocarbonyl, dimethylaminocarbonyl, aminosulfonyl, methylaminosulfonyl and dimethylaminosulfonyl.
Typical values of R15 include hydrogen, halogen, C1-6 alkyl, trifluoromethyl, C1-6 alkoxy, difluoromethoxy and trifluoromethoxy.
Illustrative values of R15 include halogen and difluoromethoxy, especially halogen.
In a first embodiment, R15 represents hydrogen. In a second embodiment, R15 represents halogen. In a first aspect of that embodiment, R15 represents fluoro. In a second aspect of that embodiment, R15 represents chloro. In a third embodiment, R15 represents C1-6 alkyl. In one aspect of that embodiment, R15 represents methyl. In a fourth embodiment, R15 represents trifluoromethyl. In a fifth embodiment, R15 represents C1-6 alkoxy. In one aspect of that embodiment, R15 represents methoxy. In a sixth embodiment, R15 represents difluoromethoxy. In a seventh embodiment, R15 represents trifluoromethoxy.
Selected values of R15 include hydrogen, fluoro, chloro, methyl, trifluoromethyl, methoxy, difluoromethoxy and trifluoromethoxy.
Particular values of R15 include chloro and difluoromethoxy, especially chloro.
Typical values of R16 include hydrogen, halogen, cyano, C1-6 alkyl, trifluoromethyl, difluoromethoxy and amino.
Illustrative values of R16 include hydrogen and halogen.
In a first embodiment, R16 represents hydrogen. In a second embodiment, R16 represents halogen. In a first aspect of that embodiment, R16 represents fluoro. In a second aspect of that embodiment, R16 represents chloro. In a third embodiment, R16 represents cyano. In a fourth embodiment, R16 represents C1-6 alkyl. In one aspect of that embodiment, R16 represents methyl. In a fifth embodiment, R16 represents trifluoromethyl. In a sixth embodiment, R16 represents difluoromethoxy. In a seventh embodiment, R16 represents amino.
Selected values of R16 include hydrogen, fluoro, chloro, cyano, methyl, trifluoromethyl, difluoromethoxy and amino.
Particular values of R16 include hydrogen and chloro.
In a particular embodiment, R16 is attached at the para-position of the phenyl ring relative to the integer R15.
Specific novel compounds in accordance with the present invention include each of the compounds whose preparation is described in the accompanying Examples, and pharmaceutically acceptable salts and solvates thereof, and co-crystals thereof.
The compounds in accordance with the present invention are beneficial in the treatment and/or prevention of various human ailments. These include autoimmune and inflammatory disorders; neurological and neurodegenerative disorders; pain and nociceptive disorders; cardiovascular disorders; metabolic disorders; ocular disorders; and oncological disorders.
Inflammatory and autoimmune disorders include systemic autoimmune disorders, autoimmune endocrine disorders and organ-specific autoimmune disorders. Systemic autoimmune disorders include systemic lupus erythematosus (SLE), psoriasis, psoriatic arthropathy, vasculitis, polymyositis, scleroderma, multiple sclerosis, systemic sclerosis, ankylosing spondylitis, rheumatoid arthritis, non-specific inflammatory arthritis, juvenile inflammatory arthritis, juvenile idiopathic arthritis (including oligoarticular and polyarticular forms thereof), anaemia of chronic disease (ACD), Still's disease (juvenile and/or adult onset), Behçet's disease and Sjögren's syndrome. Autoimmune endocrine disorders include thyroiditis. Organ-specific autoimmune disorders include Addison's disease, haemolytic or pernicious anaemia, acute kidney injury (AKI; including cisplatin-induced AKI), diabetic nephropathy (DN), obstructive uropathy (including cisplatin-induced obstructive uropathy), glomerulonephritis (including Goodpasture's syndrome, immune complex-mediated glomerulonephritis and antineutrophil cytoplasmic antibodies (ANCA)-associated glomerulonephritis), lupus nephritis (LN), minimal change disease, Graves' disease, idiopathic thrombocytopenic purpura, inflammatory bowel disease (including Crohn's disease, ulcerative colitis, indeterminate colitis and pouchitis), pemphigus, atopic dermatitis, autoimmune hepatitis, primary biliary cirrhosis, autoimmune pneumonitis, autoimmune carditis, myasthenia gravis, spontaneous infertility, osteoporosis, osteopenia, erosive bone disease, chondritis, cartilage degeneration and/or destruction, fibrosing disorders (including various forms of hepatic and pulmonary fibrosis), asthma, rhinitis, chronic obstructive pulmonary disease (COPD), respiratory distress syndrome, sepsis, fever, muscular dystrophy (including Duchenne muscular dystrophy) and organ transplant rejection (including kidney allograft rejection).
Neurological and neurodegenerative disorders include Alzheimer's disease, Parkinson's disease, Huntington's disease, ischaemia, stroke, amyotrophic lateral sclerosis, spinal cord injury, head trauma, seizures and epilepsy.
Cardiovascular disorders include thrombosis, cardiac hypertrophy, hypertension, irregular contractility of the heart (e.g. during heart failure), and sexual disorders (including erectile dysfunction and female sexual dysfunction). Modulators of TNFα function may also be of use in the treatment and/or prevention of myocardial infarction (see J J. Wu et al., JAMA, 2013, 309, 2043-2044).
Metabolic disorders include diabetes (including insulin-dependent diabetes mellitus and juvenile diabetes), dyslipidemia and metabolic syndrome.
Ocular disorders include retinopathy (including diabetic retinopathy, proliferative retinopathy, non-proliferative retinopathy and retinopathy of prematurity), macular oedema (including diabetic macular oedema), age-related macular degeneration (ARMD), vascularisation (including corneal vascularisation and neovascularisation), retinal vein occlusion, and various forms of uveitis and keratitis.
Oncological disorders, which may be acute or chronic, include proliferative disorders, especially cancer, and cancer-associated complications (including skeletal complications, cachexia and anaemia). Particular categories of cancer include haematological malignancy (including leukaemia and lymphoma) and non-haematological malignancy (including solid tumour cancer, sarcoma, meningioma, glioblastoma multiforme, neuroblastoma, melanoma, gastric carcinoma and renal cell carcinoma). Chronic leukaemia may be myeloid or lymphoid. Varieties of leukaemia include lymphoblastic T cell leukaemia, chronic myelogenous leukaemia (CML), chronic lymphocytic/lymphoid leukaemia (CLL), hairy-cell leukaemia, acute lymphoblastic leukaemia (ALL), acute myelogenous leukaemia (AML), myelodysplastic syndrome, chronic neutrophilic leukaemia, acute lymphoblastic T cell leukaemia, plasmacytoma, immunoblastic large cell leukaemia, mantle cell leukaemia, multiple myeloma, acute megakaryoblastic leukaemia, acute megakaryocytic leukaemia, promyelocytic leukaemia and erythroleukaemia. Varieties of lymphoma include malignant lymphoma, Hodgkin's lymphoma, non-Hodgkin's lymphoma, lymphoblastic T cell lymphoma, Burkitt's lymphoma, follicular lymphoma, MALT1 lymphoma and marginal zone lymphoma. Varieties of non-haematological malignancy include cancer of the prostate, lung, breast, rectum, colon, lymph node, bladder, kidney, pancreas, liver, ovary, uterus, cervix, brain, skin, bone, stomach and muscle. Modulators of TNFα function may also be used to increase the safety of the potent anticancer effect of TNF (see F. V. Hauwermeiren et al., J. Clin. Invest., 2013, 123, 2590-2603).
The present invention also provides a pharmaceutical composition which comprises a compound in accordance with the invention as described above, or a pharmaceutically acceptable salt or solvate thereof, in association with one or more pharmaceutically acceptable carriers.
Pharmaceutical compositions according to the invention may take a form suitable for oral, buccal, parenteral, nasal, topical, ophthalmic or rectal administration, or a form suitable for administration by inhalation or insufflation.
For oral administration, the pharmaceutical compositions may take the form of, for example, tablets, lozenges or capsules prepared by conventional means with pharmaceutically acceptable excipients such as binding agents (e.g. pregelatinised maize starch, polyvinylpyrrolidone or hydroxypropyl methyl cellulose); fillers (e.g. lactose, microcrystalline cellulose or calcium hydrogenphosphate); lubricants (e.g. magnesium stearate, talc or silica); disintegrants (e.g. potato starch or sodium glycollate); or wetting agents (e.g. sodium lauryl sulphate). The tablets may be coated by methods well known in the art. Liquid preparations for oral administration may take the form of, for example, solutions, syrups or suspensions, or they may be presented as a dry product for constitution with water or other suitable vehicle before use. Such liquid preparations may be prepared by conventional means with pharmaceutically acceptable additives such as suspending agents, emulsifying agents, non-aqueous vehicles or preservatives. The preparations may also contain buffer salts, flavouring agents, colouring agents or sweetening agents, as appropriate.
Preparations for oral administration may be suitably formulated to give controlled release of the active compound.
For buccal administration, the compositions may take the form of tablets or lozenges formulated in conventional manner.
The compounds of formula (I) may be formulated for parenteral administration by injection, e.g. by bolus injection or infusion. Formulations for injection may be presented in unit dosage form, e.g. in glass ampoules or multi-dose containers, e.g. glass vials. The compositions for injection may take such forms as suspensions, solutions or emulsions in oily or aqueous vehicles, and may contain formulatory agents such as suspending, stabilising, preserving and/or dispersing agents. Alternatively, the active ingredient may be in powder form for constitution with a suitable vehicle, e.g. sterile pyrogen-free water, before use.
In addition to the formulations described above, the compounds of formula (I) may also be formulated as a depot preparation. Such long-acting formulations may be administered by implantation or by intramuscular injection.
For nasal administration or administration by inhalation, the compounds according to the present invention may be conveniently delivered in the form of an aerosol spray presentation for pressurised packs or a nebuliser, with the use of a suitable propellant, e.g. dichlorodifluoromethane, fluorotrichloromethane, dichlorotetrafluoroethane, carbon dioxide or other suitable gas or mixture of gases.
The compositions may, if desired, be presented in a pack or dispenser device which may contain one or more unit dosage forms containing the active ingredient. The pack or dispensing device may be accompanied by instructions for administration.
For topical administration the compounds of use in the present invention may be conveniently formulated in a suitable ointment containing the active component suspended or dissolved in one or more pharmaceutically acceptable carriers. Particular carriers include, for example, mineral oil, liquid petroleum, propylene glycol, polyoxyethylene, polyoxypropylene, emulsifying wax and water. Alternatively, the compounds of use in the present invention may be formulated in a suitable lotion containing the active component suspended or dissolved in one or more pharmaceutically acceptable carriers. Particular carriers include, for example, mineral oil, sorbitan monostearate, polysorbate 60, cetyl esters wax, cetearyl alcohol, benzyl alcohol, 2-octyldodecanol and water.
For ophthalmic administration the compounds of use in the present invention may be conveniently formulated as micronized suspensions in isotonic, pH-adjusted sterile saline, either with or without a preservative such as a bactericidal or fungicidal agent, for example phenylmercuric nitrate, benzylalkonium chloride or chlorhexidine acetate. Alternatively, for ophthalmic administration compounds may be formulated in an ointment such as petrolatum.
For rectal administration the compounds of use in the present invention may be conveniently formulated as suppositories. These can be prepared by mixing the active component with a suitable non-irritating excipient which is solid at room temperature but liquid at rectal temperature and so will melt in the rectum to release the active component. Such materials include, for example, cocoa butter, beeswax and polyethylene glycols.
The quantity of a compound of use in the invention required for the prophylaxis or treatment of a particular condition will vary depending on the compound chosen and the condition of the patient to be treated. In general, however, daily dosages may range from around 10 ng/kg to 1000 mg/kg, typically from 100 ng/kg to 100 mg/kg, e.g. around 0.01 mg/kg to 40 mg/kg body weight, for oral or buccal administration, from around 10 ng/kg to 50 mg/kg body weight for parenteral administration, and from around 0.05 mg to around 1000 mg, e.g. from around 0.5 mg to around 1000 mg, for nasal administration or administration by inhalation or insufflation.
If desired, a compound in accordance with the present invention may be co-administered with another pharmaceutically active agent, e.g. an anti-inflammatory molecule such as methotrexate or prednisolone.
The compounds of formula (I) above may be prepared by a process which comprises cyclising a compound of formula (III):




wherein E, Q, Y, Z, R1, R2 and R3 are as defined above.

The cyclisation will advantageously be effected by treating compound (III) with a base, typically a strong base such as potassium tert-butoxide. The reaction is conveniently performed at an elevated temperature in a suitable solvent, e.g. a C1-4 alkanol such as isopropanol.
The intermediates of formula (III) above may be prepared by reacting a compound of formula Z-Q-CO2H or a carboxylate salt thereof (e.g. a carboxylate salt with an alkali metal such as lithium, sodium or potassium) with a compound of formula (IV):




wherein E, Q, Y, Z, R1, R2 and R3 are as defined above.

The reaction may advantageously be performed in the presence of a peptide coupling reagent such as O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate (HATU), and 1-hydroxybenzotriazole (HOBT), typically in the presence of a suitable base, e.g. an organic base such as N,N-diisopropylethylamine. The reaction is conveniently effected at ambient or elevated temperature in a suitable solvent, e.g. a dipolar aprotic solvent such as N,N-dimethylformamide.
Alternatively, the intermediates of formula (III) above may be prepared by reacting an acid anhydride of formula (Z-Q-CO)2O with a compound of formula (IV) as defined above.
The reaction may advantageously be performed in the presence of a base, e.g. an organic base such as triethylamine. The reaction is conveniently effected at a suitable temperature, typically a temperature in the region of 0° C., in a suitable solvent, e.g. a chlorinated solvent such as dichloromethane.
The intermediates of formula (IV) above may be prepared by reducing a compound of formula (V):




wherein E, Y, R1, R2 and R3 are as defined above.

The transformation is conveniently effected by catalytic hydrogenation of compound (V), which typically comprises treating compound (V) with gaseous hydrogen in the presence of a hydrogenation catalyst such as palladium on carbon.
Alternatively, the reduction of compound (V) may be effected by treatment with elemental iron or zinc, typically at an elevated temperature in the presence of ammonium formate.
Alternatively, the reduction of compound (V) may be effected by treatment with tin(II) chloride, typically at an elevated temperature in the presence of a mineral acid such as hydrochloric acid.
The intermediates of formula (V) wherein E represents a covalent bond or an optionally substituted straight or branched C1-4 alkylene chain may be prepared by reacting a compound of formula Y-E1-NH2 with a compound of formula (VI):




wherein Y, R1, R2 and R3 are as defined above, E1 represents a covalent bond or an optionally substituted straight or branched C1-4 alkylene chain, and L1 represents a suitable leaving group.

The leaving group L1 is suitably a halogen atom, e.g. chloro.
The reaction may advantageously be performed in the presence of a base, e.g. an organic base such as triethylamine. The reaction is conveniently effected at an elevated temperature in a suitable solvent, e.g. a C1-4 alkanol such as ethanol.
Where they are not commercially available, the starting materials of formula (VI) may be prepared by methods analogous to those described in the accompanying Examples, or by standard methods well known from the art.
It will be understood that any compound of formula (I) initially obtained from any of the above processes may, where appropriate, subsequently be elaborated into a further compound of formula (I) by techniques known from the art. By way of example, a compound of formula (I) wherein E represents —CH2— may be converted into the corresponding compound wherein E represents —CH(CH3)— by treatment with a methyl halide, e.g. methyl iodide, in the presence of a base such as lithium hexamethyldisilazide.
A compound of formula (I) which contains a hydroxy group may be alkylated by treatment with the appropriate alkyl halide in the presence of a base, e.g. sodium hydride, or silver oxide. A compound of formula (I) wherein -Q-Z represents —CH2OH may be arylated in a two-step procedure which comprises: (i) treatment with thionyl chloride; and (ii) treatment of the chloro derivative thereby obtained with the appropriate aryl or heteroaryl hydroxide. A compound of formula (I) wherein -Q-Z represents —CH2OH may be converted into the corresponding compound of formula (I) wherein -Q-Z represents —CH2S—Z via a two-step procedure which comprises: (i) treatment with thionyl chloride; and (ii) treatment of the chloro derivative thereby obtained with a compound of formula Z—SH, typically in the presence of a base, e.g. an inorganic base such as potassium carbonate. A compound of formula (I) wherein -Q-Z represents —CH2OH may be converted into the corresponding compound of formula (I) wherein -Q-Z represents —CH2CN via a two-step procedure which comprises: (i) treatment with thionyl chloride; and (ii) treatment of the chloro derivative thereby obtained with a cyanide salt such as sodium cyanide. A compound of formula (I) which contains hydroxy may be converted into the corresponding fluoro-substituted compound by treatment with diethylaminosulfur trifluoride (DAST) or bis(2-methoxyethyl)aminosulfur trifluoride (BAST). A compound of formula (I) which contains hydroxy may be converted into the corresponding difluoro-substituted compound via a two-step procedure which comprises: (i) treatment with an oxidising agent, e.g. manganese dioxide; and (ii) treatment of the carbonyl-containing compound thereby obtained with DAST.
A compound of formula (I) wherein -Q-Z represents —CH2OH may be converted into the corresponding compound wherein -Q-Z represents —CH(OH)Z in a two-step procedure which comprises: (i) oxidation with a suitable oxidising agent, e.g. Dess-Martin periodinane or manganese(IV) oxide; and (ii) treatment of the aldehyde derivative thereby obtained with a Grignard reagent, e.g. a compound of formula Z—MgBr or Z—MgCl.
A compound of formula (I) wherein -Q-Z represents —CH2OH may be converted into the corresponding compound wherein -Q-Z represents —CH(OH)CF3 in a two-step procedure which comprises: (i) oxidation with a suitable oxidising agent, e.g. Dess-Martin periodinane or manganese(IV) oxide; and (ii) treatment of the aldehyde derivative thereby obtained with (trifluoromethyl)trimethylsilane and cesium fluoride.
A compound of formula (I) which contains an N—H moiety may be alkylated by treatment with the appropriate alkyl halide, typically at an elevated temperature in an organic solvent such as acetonitrile; or at ambient temperature in the presence of a base, e.g. an alkali metal carbonate such as potassium carbonate or cesium carbonate, in a suitable solvent, e.g. a dipolar aprotic solvent such as N,N-dimethylformamide. Alternatively, a compound of formula (I) which contains an N—H moiety may be alkylated by treatment with the appropriate alkyl tosylate in the presence of a base, e.g. an inorganic base such as sodium hydride, or an organic base such as 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU).
A compound of formula (I) which contains an N—H moiety may be methylated by treatment with formaldehyde in the presence of a reducing agent, e.g. sodium triacetoxyborohydride.
A compound of formula (I) which contains an N—H moiety may be acylated by treatment with the appropriate acid chloride, e.g. acetyl chloride, or with the appropriate carboxylic acid anhydride, e.g. acetic anhydride, typically at ambient temperature in the presence of a base, e.g. an organic base such as triethylamine.
A compound of formula (I) which contains an N—H moiety may be converted into the corresponding compound wherein the nitrogen atom is substituted by C1-6 alkylsulphonyl, e.g. methylsulphonyl, by treatment with the appropriate C1-6 alkylsulphonyl chloride, e.g. methanesulphonyl chloride, or with the appropriate C1-6 alkylsulphonic acid anhydride, e.g. methanesulphonic anhydride, typically at ambient temperature in the presence of a base, e.g. an organic base such as triethylamine or N,N-diisopropylethylamine.
A compound of formula (I) substituted by amino (—NH2) may be converted into the corresponding compound substituted by C1-6 alkylsulphonylamino, e.g. methylsulphonylamino, or bis[(C1-6)alkylsulphonyl]amino, e.g. bis(methylsulphonyl)amino, by treatment with the appropriate C1-6 alkylsulphonyl halide, e.g. a C1-6 alkylsulphonyl chloride such as methanesulphonyl chloride. Similarly, a compound of formula (I) substituted by hydroxy (—OH) may be converted into the corresponding compound substituted by C1-6 alkylsulphonyloxy, e.g. methylsulphonyloxy, by treatment with the appropriate C1-6 alkylsulphonyl halide, e.g. a C1-6 alkylsulphonyl chloride such as methanesulphonyl chloride.
A compound of formula (I) containing the moiety —S— may be converted into the corresponding compound containing the moiety —S(O)— by treatment with 3-chloroperoxybenzoic acid. Likewise, a compound of formula (I) containing the moiety —S(O)— may be converted into the corresponding compound containing the moiety —S(O)2— by treatment with 3-chloroperoxybenzoic acid. Alternatively, a compound of formula (I) containing the moiety —S— may be converted into the corresponding compound containing the moiety —S(O)2— by treatment with Oxone® (potassium peroxymonosulfate).
A compound of formula (I) containing an aromatic nitrogen atom may be converted into the corresponding N-oxide derivative by treatment with 3-chloroperoxybenzoic acid.
A bromophenyl derivative of formula (I) may be converted into the corresponding optionally substituted 2-oxopyrrolidin-1-ylphenyl or 2-oxooxazolidin-3-ylphenyl derivative by treatment with pyrrolidin-2-one or oxazolidin-2-one, or an appropriately substituted analogue thereof. The reaction is conveniently effected at an elevated temperature in the presence of copper(I) iodide, trans-N,N′-dimethylcyclohexane-1,2-diamine and an inorganic base such as potassium carbonate.
A compound of formula (I) wherein R1 represents halogen, e.g. bromo, may be converted into the corresponding compound wherein R1 represents an optionally substituted aryl or heteroaryl moiety by treatment with the appropriately substituted aryl or heteroaryl boronic acid or a cyclic ester thereof formed with an organic diol, e.g. pinacol, 1,3-propanediol or neopentyl glycol. The reaction is typically effected in the presence of a transition metal catalyst, e.g. [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium(II), dichloro[1,1′-bis(di-tert-butylphosphino)ferrocene]palladium(II), tetrakis(triphenyl-phosphine)palladium(0), or bis[3-(diphenylphosphanyl)cyclopenta-2,4-dien-1-yl]iron-dichloropalladium-dichloromethane complex, and a base, e.g. an inorganic base such as sodium carbonate or potassium carbonate, or potassium phosphate.
A compound of formula (I) wherein R1 represents halogen, e.g. bromo, may be converted into the corresponding compound wherein R1 represents an optionally substituted aryl, heteroaryl or heterocycloalkenyl moiety via a two-step procedure which comprises: (i) reaction with bis(pinacolato)diboron or bis(neopentyl glycolato)diboron; and (ii) reaction of the compound thereby obtained with an appropriately functionalised halo- or tosyloxy-substituted aryl, heteroaryl or heterocycloalkenyl derivative. Step (i) is conveniently effected in the presence of a transition metal catalyst such as [1,1′-bis-(diphenylphosphino)ferrocene]dichloropalladium(II), or bis[3-(diphenylphosphanyl)-cyclopenta-2,4-dien-1-yl]iron-dichloropalladium-dichloromethane complex. Step (ii) is conveniently effected in the presence of a transition metal catalyst such as tetrakis-(triphenylphosphine)palladium(0), or bis[3-(diphenylphosphanyl)cyclopenta-2,4-dien-1-yl]iron-dichloropalladium-dichloromethane complex, and a base, e.g. an inorganic base such as sodium carbonate or potassium carbonate.
A compound of formula (I) wherein R1 represents halogen, e.g. bromo, may be converted into the corresponding compound wherein R1 represents an optionally substituted C2-6 alkynyl moiety by treatment with an appropriately substituted alkyne derivative, e.g. 2-hydroxybut-3-yne. The reaction is conveniently accomplished with the assistance of a transition metal catalyst, e.g. tetrakis(triphenylphosphine)palladium(0), typically in the presence of copper(I) iodide and a base, e.g. an organic base such as triethylamine.
A compound of formula (I) wherein R1 represents halogen, e.g. bromo, may be converted into the corresponding compound wherein R1 represents an optionally substituted imidazol-1-yl moiety by treatment with the appropriately substituted imidazole derivative, typically in the presence of copper(II) acetate and an organic base such as N,N,N′,N′-tetramethylethylenediamine (TMEDA).
A compound of formula (I) wherein R1 represents halogen, e.g. bromo, may be converted into the corresponding compound wherein R1 represents 2-(methoxycarbonyl)-ethyl via a two-step procedure which comprises: (i) reaction with methyl acrylate; and (ii) catalytic hydrogenation of the alkenyl derivative thereby obtained, typically by treatment with a hydrogenation catalyst, e.g. palladium on charcoal, under an atmosphere of hydrogen gas. Step (i) is typically effected in the presence of a transition metal catalyst, e.g. palladium(II) acetate or bis(dibenzylideneacetone)palladium(0), and a reagent such as tri(ortho-tolyl)phosphine.
In general, a compound of formula (I) containing a —C═C— functionality may be converted into the corresponding compound containing a —CH—CH— functionality by catalytic hydrogenation, typically by treatment with a hydrogenation catalyst, e.g. palladium on charcoal, under an atmosphere of hydrogen gas, optionally in the presence of a base, e.g. an alkali metal hydroxide such as sodium hydroxide.
A compound of formula (I) wherein R1 represents 6-methoxypyridin-3-yl may be converted into the corresponding compound wherein R1 represents 2-oxo-1,2-dihydropyridin-5-yl by treatment with pyridine hydrochloride; or by heating with a mineral acid such as hydrochloric acid. By utilising similar methodology, a compound of formula (I) wherein R1 represents 6-methoxy-4-methylpyridin-3-yl may be converted into the corresponding compound wherein R1 represents 4-methyl-2-oxo-1,2-dihydropyridin-5-yl; and a compound of formula (I) wherein R1 represents 6-methoxy-5-methylpyridin-3-yl may be converted into the corresponding compound wherein R1 represents 3-methyl-2-oxo-1,2-dihydropyridin-5-yl.
A compound of formula (I) wherein R1 represents 2-oxo-1,2-dihydropyridin-5-yl may be converted into the corresponding compound wherein R1 represents 2-oxopiperidin-5-yl by catalytic hydrogenation, typically by treatment with gaseous hydrogen in the presence of a hydrogenation catalyst such as platinum(IV) oxide.
A compound of formula (I) containing an ester moiety, e.g. a C2-6 alkoxycarbonyl group such as methoxycarbonyl or ethoxycarbonyl, may be converted into the corresponding compound containing a carboxy (—CO2H) moiety by treatment with an acid, e.g. a mineral acid such as hydrochloric acid.
A compound of formula (I) containing an N-(tert-butoxycarbonyl) moiety may be converted into the corresponding compound containing an N—H moiety by treatment with an acid, e.g. a mineral acid such as hydrochloric acid, or an organic acid such as trifluoroacetic acid.
A compound of formula (I) containing an ester moiety, e.g. a C2-6 alkoxycarbonyl group such as methoxycarbonyl or ethoxycarbonyl, may alternatively be converted into the corresponding compound containing a carboxy (—CO2H) moiety by treatment with a base, e.g. an alkali metal hydroxide selected from lithium hydroxide, sodium hydroxide and potassium hydroxide; or an organic base such as sodium methoxide or sodium ethoxide.
A compound of formula (I) containing a carboxy (—CO2H) moiety may be converted into the corresponding compound containing an amide moiety by treatment with the appropriate amine in the presence of a condensing agent such as 1-ethyl-3-(3-dimethyl-aminopropyl)carbodiimide.
A compound of formula (I) containing a carbonyl (C═O) moiety may be converted into the corresponding compound containing a —C(CH3)(OH)— moiety by treatment with methylmagnesium bromide. Similarly, a compound of formula (I) containing a carbonyl (C═O) moiety may be converted into the corresponding compound containing a —C(CF3)(OH)— moiety by treatment with (trifluoromethyl)trimethylsilane and cesium fluoride. A compound of formula (I) containing a carbonyl (C═O) moiety may be converted into the corresponding compound containing a —C(CH2NO2)(OH)— moiety by treatment with nitromethane.
A compound of formula (I) containing a hydroxymethyl moiety may be converted into the corresponding compound containing a formyl (—CHO) moiety by treatment with an oxidising agent such as Dess-Martin periodinane. A compound of formula (I) containing a hydroxymethyl moiety may be converted into the corresponding compound containing a carboxy moiety by treatment with an oxidising agent such as tetrapropylammonium perruthenate.
A compound of formula (I) wherein R1 represents a substituent containing at least one nitrogen atom, which substituent is linked to the remainder of the molecule via a nitrogen atom, may be prepared by reacting a compound of formula (I) wherein R1 represents halogen, e.g. bromo, with the appropriate compound of formula R1—H [e.g. 1-(pyridin-3-yl)piperazine or morpholine]. The reaction is conveniently effected with the assistance of a transition metal catalyst, e.g. tris(dibenzylideneacetone)dipalladium(0), in the presence of an amination ligand such as 2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-biphenyl (XPhos) or 2,2′-bis(diphenylphosphino)-1,1′-binaphthalene (BINAP) and a base, e.g. an inorganic base such as sodium tert-butoxide. Alternatively, the reaction may be effected using palladium diacetate, in the presence of a reagent such as [2′,6′-bis(propan-2-yloxy)biphenyl-2-yl](dicyclohexyl)phosphane and a base, e.g. an inorganic base such as cesium carbonate.
A compound of formula (I) containing an oxo moiety can be converted into the corresponding compound containing an ethoxycarbonylmethylidene moiety by treatment with triethyl phosphonoacetate in the presence of a base such as sodium hydride.
Where a mixture of products is obtained from any of the processes described above for the preparation of compounds according to the invention, the desired product can be separated therefrom at an appropriate stage by conventional methods such as preparative HPLC; or column chromatography utilising, for example, silica and/or alumina in conjunction with an appropriate solvent system.
Where the above-described processes for the preparation of the compounds according to the invention give rise to mixtures of stereoisomers, these isomers may be separated by conventional techniques. In particular, where it is desired to obtain a particular enantiomer of a compound of formula (I) this may be produced from a corresponding mixture of enantiomers using any suitable conventional procedure for resolving enantiomers. Thus, for example, diastereomeric derivatives, e.g. salts, may be produced by reaction of a mixture of enantiomers of formula (I), e.g. a racemate, and an appropriate chiral compound, e.g. a chiral base. The diastereomers may then be separated by any convenient means, for example by crystallisation, and the desired enantiomer recovered, e.g. by treatment with an acid in the instance where the diastereomer is a salt. In another resolution process a racemate of formula (I) may be separated using chiral HPLC. Moreover, if desired, a particular enantiomer may be obtained by using an appropriate chiral intermediate in one of the processes described above. Alternatively, a particular enantiomer may be obtained by performing an enantiomer-specific enzymatic biotransformation, e.g. an ester hydrolysis using an esterase, and then purifying only the enantiomerically pure hydrolysed acid from the unreacted ester antipode. Chromatography, recrystallisation and other conventional separation procedures may also be used with intermediates or final products where it is desired to obtain a particular geometric isomer of the invention.
During any of the above synthetic sequences it may be necessary and/or desirable to protect sensitive or reactive groups on any of the molecules concerned. This may be achieved by means of conventional protecting groups, such as those described in Protective Groups in Organic Chemistry, ed. J. F. W. McOmie, Plenum Press, 1973; and T. W. Greene & P. G. M. Wuts, Protective Groups in Organic Synthesis, John Wiley & Sons, 3rd edition, 1999. The protecting groups may be removed at any convenient subsequent stage utilising methods known from the art.
The following Examples illustrate the preparation of compounds according to the invention.
The compounds in accordance with this invention potently inhibit the binding of a fluorescence conjugate to TNFα when tested in the fluorescence polarisation assay described below. Moreover, certain compounds in accordance with this invention potently inhibit TNFα-induced NF-κB activation in the reporter gene assay described below.
Fluorescence Polarisation Assay
Preparation of Compound (A)
1-(2,5-Dimethylbenzyl)-6-[4-(piperazin-1-ylmethyl)phenyl]-2-(pyridin-4-ylmethyl)-1H-benzimidazole—hereinafter referred to as “Compound (A)”—can be prepared by the procedure described in Example 499 of WO 2013/186229 (published 19 Dec. 2013); or by a procedure analogous thereto.
Preparation of Fluorescence Conjugate
Compound (A) (27.02 mg, 0.0538 mmol) was dissolved in DMSO (2 mL). 5 (-6) Carboxy-fluorescein succinimyl ester (24.16 mg, 0.0510 mmol) (Invitrogen catalogue number: C1311) was dissolved in DMSO (1 mL) to give a bright yellow solution. The two solutions were mixed at room temperature, the mixture turning red in colour. The mixture was stirred at room temperature. Shortly after mixing a 20 μL aliquot was removed and diluted in a 80:20 mixture of AcOH:H2O for LC-MS analysis on the 1200RR-6140 LC-MS system. The chromatogram showed two closely eluting peaks at retention times of 1.42 and 1.50 minutes, both with mass (M+H)+=860.8 amu, corresponding to the two products formed with the 5- and 6-substituted carboxyfluorescein group. A further peak at retention time 2.21 minutes had a mass of (M+H)+=502.8 amu, corresponding to Compound (A). No peak was observed for unreacted 5(-6) carboxyfluorescein succinimyl ester. The peak areas were 22.0%, 39.6% and 31.4% for the three signals, indicating a 61.6% conversion to the two isomers of the desired fluorescence conjugate at that time-point. Further 20 μL aliquots were extracted after several hours and then after overnight stirring, diluted as before and subjected to LC-MS analysis. The percentage conversion was determined as 79.8% and 88.6% respectively at these time-points. The mixture was purified on a UV-directed preparative HPLC system. The pooled purified fractions were freeze-dried to remove excess solvent. After freeze-drying, an orange solid (23.3 mg) was recovered, equivalent to 0.027 mmol of fluorescence conjugate, corresponding to an overall yield of 53% for the reaction and preparative HPLC purification.
Inhibition of Binding of Fluorescence Conjugate to TNFα
Compounds were tested at 10 concentrations starting from 25 μM in a final assay concentration of 5% DMSO, by pre-incubation with TNFα for 60 minutes at ambient temperature in 20 mM Tris, 150 mM NaCl, 0.05% Tween 20, before addition of the fluorescence conjugate and a further incubation for 20 hours at ambient temperature. The final concentrations of TNFα and the fluorescence conjugate were 10 nM and 10 nM respectively in a total assay volume of 25 μL. Plates were read on a plate reader capable of detecting fluorescence polarisation (e.g. an Analyst HT plate reader; or an Envision plate reader). An IC50 value was calculated using XLfitTM (4 parameter logistic model) in ActivityBase.
When tested in the fluorescence polarisation assay, the compounds of the accompanying Examples were all found to exhibit IC50 values of 50 μM or better.
Reporter Gene Assay
Inhibition of TNFα-Induced NF-κB Activation
Stimulation of HEK-293 cells by TNFα leads to activation of the NF-κB pathway. The reporter cell line used to determine TNFα activity was purchased from InvivoGen. HEK-BlueTM CD40L is a stable HEK-293 transfected cell line expressing SEAP (secreted embryonic alkaline phosphatase) under the control of the IFNβ minimal promoter fused to five NF-κB binding sites. Secretion of SEAP by these cells is stimulated in a dose-dependent manner by TNFα, with an EC50 of 0.5 ng/mL for human TNFα. Compounds were diluted from 10 mM DMSO stocks (final assay concentration 0.3% DMSO) to generate a 10-point 3-fold serial dilution curve (e.g. 30,000 nM to 2 nM final concentration). Diluted compound was preincubated with TNFα for 60 minutes prior to addition to a 384-well microtitre plate and incubated for 18 h. The final TNFα concentration in the assay plate was 0.5 ng/mL. SEAP activity was determined in the supernatant using a colorimetric substrate, e.g. QUANTI-BlueTM or HEK-BlueTM Detection media (InvivoGen). Percentage inhibitions for compound dilutions were calculated between a DMSO control and maximum inhibition (by excess control compound) and an IC50 value calculated using XLfitTM (4 parameter logistic model) in ActivityBase.
When tested in the reporter gene assay, certain compounds of the accompanying Examples were found to exhibit IC50 values of 50 μM or better.


EXAMPLES
Abbreviations
DCM: dichloromethane MeOH: methanol
DMSO: dimethylsulfoxide DMF: N,N-dimethylformamide
DIPEA: N,N-diisopropylethylamine HOBT: 1-hydroxybenzotriazole
IPA: isopropanol
HATU: 1-[bis(dimethylamino)methylene]-1H-1,2,3-triazolo[4,5-b]pyridinium 3-oxid hexafluorophosphate
h: hour M: mass
HPLC: High Performance Liquid Chromatography
LCMS: Liquid Chromatography Mass Spectrometry
ES+: Electrospray Positive Ionisation RT: retention time
Nomenclature
Compounds were named with the aid of ACD/Name Batch (Network) version 11.01, and/or Accelrys Draw 4.0.
Analytical Conditions
Analytical HPLC


    Column: Waters, X Bridge, 20×2.1 mm, 2.5 μm
    Mobile Phase A: 10 mM ammonium formate in water+0.1% ammonia
    Mobile Phase B: acetonitrile+5% solvent A+0.1% ammonia
    Injection Volume: 5.0 μL
    Flow Rate: 1.00 mL/minute
    Gradient program: 5% B to 95% B in 4 minutes; hold till 5.00 minutes; at 5.10 minutes B conc. is 5% up to 6.5 minutes


General Method A
To a solution of Intermediate 2 (1 eq) in DMF (5 mL) were added HATU (1.1 eq), HOBT (1.1 eq) and DIPEA (3 eq) at 0° C. The reaction mixture was stirred at 0° C. for 5 minutes, after which time the appropriate carboxylic acid (1.12 eq) was added at 0° C. The reaction mixture was stirred at room temperature for 3 h, after which time the reaction mixture was quenched with ice. The resulting solid was filtered, dried and used in the next step without further purification.
General Method B
To a solution of the appropriate amide intermediate (1 eq) in IPA (7 mL) was added potassium tert-butoxide (1.1 eq). The reaction mixture was heated at 90° C. for 20 h, then concentrated in vacuo. The residue was diluted with water (25 mL) and extracted with DCM (3×30 mL). The combined organic layers were dried over anhydrous sodium sulphate, filtered and concentrated in vacuo. The crude material was then purified by either column chromatography or preparative HPLC to give the title compound.
Intermediate 1
N-[(2,5-Dichlorophenyl)methyl]-4-nitropyridin-3-amine
To a solution of 3-chloro-4-nitropyridine (3.2 g, 20 mmol) in ethanol (40 mL) were added triethylamine (8.35 mL, 60 mmol) and 2,5-dichlorophenylmethanamine hydrochloride (8.5 g, 40 mmol) at 0° C. The reaction mixture was heated at 80° C. for 1 h, then concentrated in vacuo and diluted with ethyl acetate (40 mL). The organic layer was washed with brine (2×20 mL), dried over anhydrous sodium sulphate, filtered and concentrated in vacuo. The crude material was purified by column chromatography (SiO2, 1% MeOH in DCM) to give the title compound (1.7 g, 80%). δH (400 MHz, CDCl3) 9.27 (s, 2H), 8.57 (br s, 1H), 8.32 (d, 1H, J 6.0 Hz), 7.38 (d, 1H, J 8.4 Hz), 7.30-7.26 (m, 1H), 6.60 (d, 1H, J 6.0 Hz), 4.64 (d, 2H, J 6.0 Hz).
Intermediate 2
N3-[(2,5-Dichlorophenyl)methyl]pyridine-3,4-diamine
To a stirred solution of Intermediate 1 (5 g, 16 mmol) in methanol (50 mL) was added Zn powder (5.49 g, 84 mol) at 0° C. The reaction mixture was stirred for 5 minutes, then ammonium formate (4.24 g, 64 mmol) was added at 0° C. The reaction mixture was stirred for 2-3 h, then filtered through celite, and the filtrate was concentrated in vacuo. The crude material was purified by column chromatography (SiO2, 8% MeOH in DCM+0.1% NH3) to give the title compound (4.5 g, 50%). δH (400 MHz, CDCl3) 7.59 (d, 1H, J 5.2 Hz), 7.40-7.38 (m, 2H), 7.34 (br s, 1H), 7.24 (dd, 1H, J 6.0, 2.4 Hz), 6.60 (d, 1H, J 5.2 Hz), 4.43 (s, 2H). LCMS (ES+) 267.9 (M+H)+, RT 2.18 minutes.
Intermediate 3
N-(4-Aminopyridin-3-yl)-N-[(2,5-dichlorophenyl)methyl]acetamide
To a solution of Intermediate 2 (4.5 g, 16.7 mmol) in DCM (10 mL) was added triethylamine (2.31 mL, 16.7 mmol) at 0° C. The reaction mixture was stirred for 5 minutes, then acetic anhydride (1.88 g, 18.4 mmol) was added at 0° C. The reaction mixture was stirred at room temperature for 1 h, then quenched by ice and extracted with DCM (3×50 mL). The combined organic layers were dried over anhydrous sodium sulphate, filtered and concentrated in vacuo. The crude material was purified by column chromatography (SiO2, 4% MeOH in DCM) to give the title compound (3.8 g, 73%). δH (400 MHz, DMSO-d6) 9.47 (br s, 1H), 7.81 (d, 1H, J 4.8 Hz), 7.67 (s, 1H), 7.53 (d, 1H, J 8.4 Hz), 7.48 (br s, 1H), 7.45 (d, 1H, J 4.8 Hz), 7.38 (dd, 1H, J 6.0, 2.4 Hz), 5.93 (br s, 1H), 4.45 (d, 2H, J 6.0 Hz), 2.12 (s, 3H). LCMS (ES+) 309.9 (M+H)+, RT 1.82 minutes.
Intermediate 4
N-(4-Aminopyridin-3-yl)-N-[(2,5-dichlorophenyl)methyl]-2-hydroxyacetamide
The title compound was prepared from Intermediate 2 (350 mg, 1.31 mmol), DMF (5 mL), HATU (548 mg, 1.44 mmol), HOBT (195 mg, 1.44 mmol), DIPEA (704 μL, 3.93 mmol) and glycolic acid (120 mg, 1.57 mmol) according to General Method A.
Intermediate 5
N-(4-Aminopyridin-3-yl)-N-[(2,5-dichlorophenyl)methyl]-2-(pyridin-3-yloxy)acetamide
The title compound was prepared from Intermediate 2 (400 mg, 1.50 mmol), DMF (5 mL), HATU (626 mg, 1.64 mmol), HOBT (222 mg, 1.65 mmol), DIPEA (795 μL, 4.49 mmol) and 2-(pyridin-3-yloxy)acetic acid (340 mg, 1.80 mmol) according to General Method A.
Intermediate 6
N-(4-Aminopyridin-3-yl)-N-[(2,5-dichlorophenyl)methyl]-2-[(6-methoxypyridin-3-yl)-oxy]acetamide
The title compound was prepared from Intermediate 2 (300 mg, 1.12 mmol), DMF (5 mL), HATU (512 mg, 1.23 mmol), HOBT (182 mg, 1.23 mmol), DIPEA (234 μL, 3.37 mmol) and 2-[(6-methoxypyridin-3-yl)oxy]acetic acid (295 mg, 1.34 mmol) according to General Method A.
Intermediate 7
4-(2-{N-(4-Aminopyridin-3-yl)-N-[(2,5-dichlorophenyl)methyl]amino}-2-oxoethoxy)-benzamide
The title compound was prepared from Intermediate 2 (300 mg, 1.23 mmol), DMF (5 mL), HATU (512 mg, 1.23 mmol), HOBT (182 mg, 1.23 mmol), DIPEA (234 μL, 3.37 mmol) and 2-(4-carbamoylphenoxy)acetic acid (262 mg, 1.34 mmol) according to General Method A.
Example 1
3-[(2,5-Dichlorophenyl)methyl]-2-methylimidazo[4,5-c]pyridine
To a solution of Intermediate 3 (3.8 g, 12.2 mmol) in IPA (30 mL) was added potassium tert-butoxide (1.51 g). The reaction mixture was heated at 90° C. for 2-3 h, then concentrated in vacuo. The residue was diluted with water (25 mL) and extracted with DCM (3×30 mL). The combined organic layers were dried over anhydrous sodium sulphate, filtered and concentrated in vacuo. The crude material was then purified by column chromatography (SiO2, 5% MeOH in DCM) to give the title compound (2.6 g, 73%) as a yellow solid. δH (400 MHz, CD3OD) 8.61 (s, 1H), 8.35 (d, 1H, J 5.6 Hz), 7.66 (d, 1H, J 5.6 Hz), 7.51 (d, 1H, J 8.8 Hz), 7.38 (dd, 1H, J 6.4, 2.0 Hz), 6.80 (d, 1H, J 1.6 Hz), 5.67 (s, 2H), 3.31 (s, 3H). LCMS (ES+) 292 (M+H)+, RT 1.90 minutes.
Example 2
{3-[(2,5-Dichlorophenyl)methyl]imidazo[4,5-c]pyridin-2-yl}methanol
Prepared from Intermediate 4 (427 mg, 1.3 mmol), IPA (7 mL) and potassium tert-butoxide (176 mg, 1.57 mmol) according to General Method B. Purification of the crude product by preparative HPLC gave the title compound (20 mg, 5%) as an off-white solid. δH (400 MHz, CD3OD) 8.61 (s, 1H), 8.38 (d, 1H, J 6.0 Hz), 7.74 (d, 1H, J 5.6 Hz), 7.51 (d, 1H, J 8.4 Hz), 7.36 (dd, 1H, J 6.0, 2.8 Hz), 6.83 (d, 1H, J 2.0 Hz), 5.80 (s, 2H), 4.92 (s, 2H). LCMS (ES+) 308 (M+H)+, RT 1.56 minutes.
Example 3
3-[(2,5-Dichlorophenyl)methyl]-2-(pyridin-3-yloxymethyl)imidazo[4,5-c]pyridine
Prepared from Intermediate 5 (604 mg, 1.50 mmol), IPA (7 mL) and potassium tert-butoxide (202 mg, 1.80 mmol) according to General Method B. Purification of the crude product by preparative HPLC gave the title compound (33 mg, 6%) as an off-white solid. δH (400 MHz, CD3OD) 8.79 (s, 1H), 8.44 (d, 1H, J 6.0 Hz), 8.14 (d, 1H, J 3.6 Hz), 8.03 (d, 1H, J 2.8 Hz), 7.82 (d, 1H, J 5.6 Hz), 7.48 (d, 1H, J 8.4 Hz), 7.41 (dd, 1H, J 5.6, 1.6 Hz), 7.34 (d, 1H, J 4.8 Hz), 7.31 (dd, 1H, J 6.0, 2.8 Hz), 6.55 (d, 1H, J 2.0 Hz), 5.84 (s, 2H), 5.59 (s, 2H). LCMS (ES+) 385 (M+H)+, RT 1.93 minutes.
Example 4
3-[(2,5-Dichlorophenyl)methyl]-2-[(6-methoxypyridin-3-yl)oxymethyl]imidazo[4,5-c]-pyridine
Prepared from Intermediate 6 (300 mg, 0.70 mmol), IPA (7 mL) and potassium tert-butoxide (86 mg, 0.77 mmol) according to General Method B. Purification of the crude product by column chromatography (SiO2, 5-10% MeOH in DCM) gave the title compound (80 mg, 27%) as a yellow solid. δH (400 MHz, CDCl3) 8.66 (br s, 1H), 8.52 (d, 1H, J 5.6 Hz), 7.80 (d, 1H, J 3.2 Hz), 7.75 (d, 1H, J 5.6 Hz), 7.39 (d, 1H, J 8.4 Hz), 7.24 (dd, 1H, J 6.0, 2.4 Hz), 7.14 (dd, 1H, J 6.0, 2.8 Hz), 6.63 (d, 1H, J 9.2 Hz), 6.52 (d, 1H, J 2.0 Hz), 5.64 (s, 2H), 5.38 (s, 2H), 3.86 (s, 3H). LCMS (ES+) 415 (M+H)+, RT 2.17 minutes.
Example 5
4-({3-[(2,5-Dichlorophenyl)methyl]imidazo[4,5-c]pyridin-2-yl}methoxy)benzamide
Prepared from Intermediate 7 (300 mg, 0.68 mmol), IPA (7 mL) and potassium tert-butoxide (84 mg, 0.75 mmol) according to General Method B. Purification of the crude product by column chromatography (SiO2, 5-10% MeOH in DCM) gave the title compound (50 mg, 17%) as an off-white solid. δH (400 MHz, CD3OD) 8.75 (s, 1H), 8.44 (d, 1H, J 5.6 Hz), 7.82 (d, 1H, J 5.6 Hz), 7.78 (d, 2H, J 9.2 Hz), 7.47 (d, 1H, J 8.8 Hz), 7.30 (dd, 1H, J 6.4, 2.4 Hz), 6.88 (d, 2H, J 8.8 Hz), 6.51 (d, 1H, J 2.0 Hz), 5.82 (s, 2H), 5.56 (s, 2H). LCMS (ES+) 427 (M+H)+, RT 1.82 minutes.

## Claims

1. A compound represented by formula (IIA) or an N-oxide thereof, or a pharmaceutically acceptable salt or solvate thereof,




wherein
E represents —CH2—;
Q represents —CH2— or —CH2O—;
Z represents hydrogen; or Z represents C1-6 alkyl, aryl or heteroaryl, any of which groups may be optionally substituted by one, two or three substituents independently selected from C1-6 alkoxy and aminocarbonyl;
R11 represents hydrogen or halogen
R15 represents halogen or difluoromethoxy, and
R16 represents hydrogen or halogen.

2. A compound that is
3-[(2,5-Dichlorophenyl)methyl]-2-methylimidazo[4,5-c]pyridine;
{3-[(2,5-Dichlorophenyl)methyl]imidazo[4,5-c]pyridin-2-yl}methanol;
3-[(2,5-Dichlorophenyl)methyl]-2-(pyridin-3-yloxymethyl)imidazo[4,5-c]pyridine;
3-[(2,5-Dichlorophenyl)methyl]-2-[(6-methoxypyridin-3-yl)oxymethyl]imidazo[4,5-c]-pyridine; or
4-({3-[(2,5-Dichlorophenyl)methyl]imidazo[4,5-c]pyridin-2-yl}methoxy)benzamide.

3. A pharmaceutical composition comprising a compound of formula (IIA) as defined in claim 1 or an N-oxide thereof, or a pharmaceutically acceptable salt or solvate thereof, in association with a pharmaceutically acceptable carrier.

4. The pharmaceutical composition as claimed in claim 3 further comprising an additional pharmaceutically active ingredient.

5. The compound as claimed in claim 1 wherein Z represents hydrogen; or Z represents methyl, phenyl or pyridinyl, any of which groups may be optionally substituted by one, two or three substituents independently selected from methoxy and aminocarbonyl.