# Patent

## Title
Bis-amido pyridines

## Abstract

This invention relates to bis-amido pyridines of general formula (I)




their use as SMAC mimetics, pharmaceutical compositions containing them, and their use as a medicaments for the treatment and/or prevention of diseases characterized by excessive or abnormal cell proliferation and associated conditions such as cancer.

The groups R1 to R4 have the meanings given in the claims and in the specification.

## Background
This invention relates to compounds of the general formula (I)




wherein the groups R1 to R4 have the meanings given in the claims and in the specification. The compounds of the invention are suitable for the treatment of diseases characterized by excessive or abnormal cell proliferation, pharmaceutical preparations containing such compounds and their uses as a medicament. The compounds of the invention modulate IAP activity.

BACKGROUND OF THE INVENTION
Apoptosis, a form of programmed cell death, typically occurs in the normal development and maintenance of healthy tissues in multicellular organisms. It is a complex process, which results in the removal of damaged, diseased or developmentally redundant cells, without signs of inflammation or necrosis. Apoptosis thus occurs as a normal part of development, the maintenance of normal cellular homeostasis, or as a consequence of stimuli such as chemotherapy and radiation.
The intrinsic apoptotic pathway is known to be deregulated in cancer and lymphoproliferative syndromes, as well as autoimmune disorders such as multiple sclerosis and rheumatoid arthritis. Additionally, alterations in a host apoptotic response have been described in the development or maintenance of viral and bacterial infections. Cancer cells gain the ability to overcome or circumvent apoptosis and continue with inappropriate proliferation despite strong pro-apoptotic signals such as hypoxia, endogenous cytokines, radiation treatments and chemotherapy. In autoimmune disease, pathogenic effector cells can become resistant to normal apoptotic cues. Resistance can be caused by numerous mechanisms, including alterations in the apoptotic machinery due to increased activity of anti-apoptotic pathways or expression of anti-apoptotic genes. Thus, approaches that reduce the threshold of apoptotic induction in cancer cells by overcoming resistance mechanisms may be of significant clinical utility.
Caspases serve as key effector molecules in apoptosis signaling. Caspases (cysteine containing aspartate specific proteases) are strong proteases and once activated, digest vital cell proteins from within the cell. Since caspases are highly active proteases, tight control of this family of proteins is necessary to prevent premature cell death. In general, caspases are synthesized as largely inactive zymogens that require proteolytic processing for activation. This proteolytic processing is only one of the ways in which caspases are regulated. The second mechanism of regulation is through a family of proteins that bind and inhibit caspases.
One family of molecules that inhibit caspases are the Inhibitors of Apoptosis (IAP) (Deveraux et al., J Clin Immunol (1999), 19: 388-398). IAPs were originally discovered in baculovirus by their ability to substitute for P35 protein function, an anti-apoptotic gene (Crook et al. (1993) J Virology 67, 2168-2174). Human IAPs are characterized by the presence of one to three homologous structural domains known as baculovirus IAP repeat (BIR) domains. Some IAP family members also contain a RING zinc finger domain at the C-terminus, with the capability to ubiquitylate target proteins via their E3 ligase function. The human IAPs, XIAP, HIAP1 (also referred to as cIAP2), and HIAP2 (cIAP1) each have three BIR domains, and a carboxy terminal RING zinc finger. Another IAP, NAIP, has three BIR domains (BIR1, BIR2 and BIR3), but no RING domain, whereas Livin, TsIAP and MLIAP have a single BIR domain and a RING domain. The X chromosome-linked inhibitor of apoptosis (XIAP) is an example of an IAP, which can inhibit the initiator caspase Caspase-9, and the effector caspases, Caspase-3 and Caspase-7, by direct binding. XIAP can also induce the degradation of caspases through the ubiquitylation-mediated proteasome pathway via the E3 ligase activity of a RING zinc finger domain Inhibition of Caspase-9 is mediated by the BIR3 domains of XIAP, whereas effector caspases are inhibited by binding to the linker-BIR2 domain. The BIR domains also mediate the interactions of IAPs with tumor necrosis factor-receptor associated factor (TRAFs)-I and -2, and with TAB1, adaptor proteins affecting survival signaling through NFkB activation. IAP proteins can thus function as direct brakes on the apoptosis cascade by inhibiting active caspases or by redirecting cellular signaling to a pro-survival mode. Survivin is another member of the IAP family of antiapoptotic proteins. It is shown to be conserved in function across evolution as homologues of the protein are found both in vertebrates and invertebrates.
Cancer cells and cells involved in autoimmune disease may avoid apoptosis by the sustained over-expression of one or more members of the IAP family of proteins. For example, IAP overexpression has been demonstrated to be prognostic of poor clinical outcome in multiple cancers, and decreased IAP expression through RNAi strategies sensitizes tumor cells to a wide variety of apoptotic insults including chemotherapy, radiotherapy and death receptor ligands. For XIAP, this is shown in cancers as diverse as leukemia and ovarian cancer. Over expression of cIAP1 and cIAP2 resulting from the frequent chromosome amplification of the 11q21-q23 region, which encompasses both genes, has been observed in a variety of malignancies, including medulloblastomas, renal cell carcinomas, glioblastomas, and gastric carcinomas.
The interaction between the baculoviral IAP repeat-3 (BIR3) domain of X-linked inhibitor of apoptosis (XIAP) and caspase-9 is of therapeutic interest because this interaction is inhibited by the NH2-terminal seven-amino-acid residues of the so-called “second mitochondrial-derived activator of caspase” (in short and hereinafter Smac), a naturally occurring antagonist of IAPs. Small-molecule Smac mimetics have been generated anticipating efficacy in cancer by reconstituting apoptotic signaling.
Thus, there is the need to provide SMAC mimetics useful for the prevention and/or treatment of diseases characterized by excessive or abnormal cell proliferation, such as cancer.


DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to compounds of formula (I)




wherein R1 to R4 are as defined below in this specification. The compounds according to formula (I) act as Smac mimetics. Thus, the compounds of the invention may be used for example for the treatment of diseases, which are characterized by an increased apoptosis resistance due to IAP function. Preferably, the compounds of the invention can be used in the treatment of cancer.

The present invention therefore relates to compounds of general formula (I)




    
    
        wherein,
        R1 is selected from —CH3, —CH2CH3, —C1-3haloalkyl and —H;
        R2 is selected from —C1-3alkyl or —H;
        R2a is selected from —C1-3 alkyl or —H;
        R3 is selected from benzyl, phenyl and 5-12 membered heteroaryl, each of which group can be optionally and independently substituted with one or more groups independently selected from R5, or
        R3 is 8-12 membered aromatic heterocyclyl, each of which heterocyclyl group can be optionally and independently substituted with one or more groups independently selected from ═O and R5;
        R4 is selected from —H, halogen, phenyl, naphthyl and 5-12 membered heteroaryl, each of which groups can be optionally and independently substituted with one or more groups independently selected from R6, or
        R4 is 8-12 membered aromatic heterocyclyl, which heterocyclyl can be optionally and independently substituted with one or more groups independently selected from ═O and R6;
        R5 is selected from halogen, —CN, —C1-3alkyl, —O—C1-5alkyl;
        R6 is selected from halogen, —CN, —NH2, —C1-3alkyl, —C1-3haloalkyl, —O—C1-3alkyl;

and wherein the compounds of formula (I) may optionally be present in the form of salts.

    
    


In a preferred embodiment the invention relates to compounds of formula (I), wherein R1 is selected from —CH3 and —CH2—CH3.
In a preferred embodiment the invention relates to compounds of formula (I), wherein R2 is —CH3 or —CH2CH3.
In a preferred embodiment the invention relates to compounds of formula (I), wherein R2′ is —H.
In a preferred embodiment the invention relates to compounds of formula (I), wherein R3 is 5-12 membered heteroaryl, optionally substituted with one or more groups independently selected from R5.
In a preferred embodiment the invention relates to compounds of formula (I), wherein R3 is selected from pyridyl, pyrimidinyl,




each of which groups can be optionally substituted as defined herein above and below.

In a preferred embodiment the invention relates to compounds of formula (I), wherein R3 is pyridyl or




each of which groups can be optionally and independently substituted as defined herein above and below.

In a preferred embodiment the invention relates to compounds of formula (I), wherein R4 is 5-12 membered heteroaryl, optionally substituted with one or more groups independently selected from R6.
In a preferred embodiment the invention relates to compounds of formula (I), wherein R4 is selected from —Cl, naphthyl, pyridyl, pyrimidinyl,




each of which group can be optionally and independently substituted with one or more substituents as defined herein below and above.

In a preferred embodiment the invention relates to compounds of formula (I), wherein R4 is selected from —Cl, naphthyl, pyridyl, pyrimidinyl,




each of which group can be optionally and independently substituted with one or more substituents as defined herein below and above.

In a preferred embodiment the invention relates to compounds of formula (I), wherein R4 is selected from phenyl, pyridyl,




each of which groups can be optionally and independently substituted as defined herein below and above.

In a preferred embodiment the invention relates to compounds of formula (I), wherein R4 is selected from phenyl, pyridyl,




each of which groups can be optionally and independently substituted as defined herein below and above.

In a preferred embodiment the invention relates to compounds of formula (I), wherein R4 is selected from




each of which groups can be optionally and independently substituted as defined herein above and below.

In a preferred embodiment the invention relates to compounds of formula (I), wherein R4 is selected from




each of which groups can be optionally and independently substituted as defined herein above and below.

In a preferred embodiment the invention relates to compounds of formula (I), wherein R5 is selected from —CN, —F, —Cl, —CH3, —O—CH3.
In a preferred embodiment the invention relates to compounds of formula (I), wherein R4 is substituted with one or more substituents selected from ═O and R6, wherein R6 is selected from —CN, —F, —Cl, —NH2, —CH3, —O—CH3.
In another aspect the invention relates to compounds of general formula (I) or of anyone of the embodiments as disclosed above for use in the treatment of cancer.
In another aspect the invention relates to compounds of general formula (I) or of anyone of the embodiments as disclosed above—or the pharmaceutically acceptable salts thereof—for use as medicaments.
In another aspect the invention relates to compounds of general formula (I) or of anyone of the embodiments as disclosed above—or the pharmaceutically acceptable salts thereof—for use in the treatment and/or prevention of cancer, infections, inflammations and autoimmune diseases.
In another aspect the invention relates to compounds of general formula (I) or of anyone of the embodiments as disclosed above—or the pharmaceutically acceptable salts thereof—for use in the treatment and/or prevention of cancer, preferably of carcinomas of the breast, in particular triple negative breast cancer (TNBC), prostate, brain or ovary, non-small-cell bronchial carcinomas (NSCLC), melanomas, acute myeloid leukaemia (AML) and chronic lymphatic leukaemias (CLL).
In another aspect the invention relates to compounds of general formula (I) or of anyone of the embodiments as disclosed above—or the pharmaceutically acceptable salts thereof—for use in the treatment and/or prevention of carcinomas of the breast, in particular triple negative breast cancer (TNBC), prostate, brain or ovary, non-small-cell bronchial carcinomas (NSCLC), melanomas, acute myeloid leukaemia (AML) and chronic lymphatic leukaemias (CLL).
In another aspect the invention relates to a method for the treatment and/or prevention of cancer comprising administering a therapeutically effective amount of a compound of general formula (I) or of anyone of the embodiments as disclosed above—or one of the pharmaceutically acceptable salts thereof—to a human being.
In another aspect the invention relates to a method for the treatment and/or prevention of carcinoma of the breast, in particular triple negative breast cancer (TNBC), prostate, brain or ovary, non-small-cell bronchial carcinomas (NSCLC), melanomas, acute myeloid leukaemia (AML) and chronic lymphatic leukemias (CLL) comprising administering a therapeutically effective amount of a compound of general formula (I) or of anyone of the embodiments as disclosed above—or one of the pharmaceutically acceptable salts thereof—to a human being.
In another aspect the invention relates to a pharmaceutical preparation containing as active substance one or more compounds of general formula (I) or of anyone of the embodiments as disclosed above—or the pharmaceutically acceptable salts thereof—optionally in combination with conventional excipients and/or carriers.
In another aspect the invention relates to a pharmaceutical preparation comprising a compound of general formula (I) or of anyone of the embodiments as disclosed above—or one of the pharmaceutically acceptable salts thereof—and at least one other cytostatic or cytotoxic active substance, different from formula (I).
DEFINITIONS
Terms that are not specifically defined here have the meanings that are apparent to the skilled man in the light of the overall disclosure and the context as a whole.
As used herein, the following definitions apply, unless stated otherwise.
In the groups, radicals, or moieties defined below, the number of carbon atoms is often specified preceding the group, for example, —C1-5alkyl means an alkyl group or radical having 1 to 5 carbon atoms. In general, for groups comprising two or more subgroups, the first named sub-group is the radical attachment point, for example the substitutent —C1-5alkyl-C3-10cycloalkyl, means a C3-10cycloalkyl group which is bound to a C1-5alkyl, the latter of which is bound to the core structure or to the group to which the substitutent is attached.
The indication of the number of members in groups that contain one or more heteroatom(s) (heteroalkyl, heteroaryl, heteroarylalkyl, heterocyclyl, heterocyclylalkyl) relates to the total atomic number of all the ring members or chain members or the total of all the ring and chain members.
The person skilled in the art will appreciate that substituent groups containing a nitrogen atom can also be indicated as amine or amino. Similarly, groups containing oxygen atom can also be indicated with -oxy, like for example alkoxy. Groups containing —C(O)— can also be indicated as carboxy; groups containing
—NC(O)— can also be indicated as amide; groups containing —NC(O)N— can also be indicated as urea; groups containing —NS(O)2— can also be indicated as sulfonamide.
Alkyl denotes monovalent, saturated hydrocarbon chains, which may be present in both linear and branched form. If an alkyl is substituted, the substitution may take place independently of one another, by mono- or polysubstitution in each case, on all the hydrogen-carrying carbon atoms.
The term “C1-5-alkyl” includes for example methyl (Me; —CH3), ethyl (Et; —CH2CH3), 1-propyl (n-propyl; n-Pr; —CH2CH2CH3), 2-propyl (i-Pr; iso-propyl; —CH(CH3)2), 1-butyl (n-butyl; n-Bu; —CH2CH2CH2CH3), 2-methyl-1-propyl (iso-butyl; i-Bu; —CH2CH(CH3)2), 2-butyl (sec-butyl; sec-Bu; —CH(CH3)CH2CH3), 2-methyl-2-propyl (tert-butyl; t-Bu; —C(CH3)3), 1-pentyl (n-pentyl; —CH2CH2CH2CH2CH3), 2-pentyl (—CH(CH3)CH2CH2CH3), 3-pentyl (—CH(CH2CH3)2), 3-methyl-1-butyl (iso-pentyl; —CH2CH2CH(CH3)2), 2-methyl-2-butyl (—C(CH3)2CH2CH3), 3-methyl-2-butyl (—CH(CH3)CH(CH3)2), 2,2-dimethyl-1-propyl (neo-pentyl; —CH2C(CH3)3), 2-methyl-1-butyl (—CH2CH(CH3)CH2CH3).
By the terms propyl, butyl, pentyl, etc. without any further definition are meant saturated hydrocarbon groups with the corresponding number of carbon atoms, wherein all isomeric forms are included.
The above definition for alkyl also applies if alkyl is a part of another group such as for example Cx-y-alkylamino or Cx-y-alkyloxy or Cx-y-alkoxy, wherein Cx-y-alkyloxy and Cx-y-alkoxy indicate the same group.
The term alkylene can also be derived from alkyl. Alkylene is bivalent, unlike alkyl, and requires two binding partners. Formally, the second valency is produced by removing a hydrogen atom in an alkyl. Corresponding groups are for example —CH3 and —CH2, —CH2CH3 and —CH2CH2 or >CHCH3 etc.
The term “C1-4-alkylene” includes for example —(CH2)—, —(CH2—CH2)—, —(CH(CH3))—, —(CH2—CH2—CH2)—, —(C(CH3)2)—, —(CH(CH2CH3))—, —(CH(CH3)—CH2)—, —(CH2—CH(CH3))—, —(CH2—CH2—CH2—CH2)—, —(CH2—CH2—CH(CH3))—, —(CH(CH3)—CH2—CH2)—, —(CH2—CH(CH3)—CH2)—, —(CH2—C(CH3)2)—, —(C(CH3)2—CH2)—, —(CH(CH3)—CH(CH3))—, —(CH2—CH(CH2CH3))—, —(CH(CH2CH3)—CH2)—, —(CH(CH2CH2CH3))—, —(CHCH(CH3)2)— and —C(CH3)(CH2CH3)—.
Other examples of alkylene are methylene, ethylene, propylene, 1-methylethylene, butylene, 1-methylpropylene, 1,1-dimethylethylene, 1,2-dimethylethylene, pentylene, 1,1-dimethylpropylene, 2,2-dimethylpropylene, 1,2-dimethylpropylene, 1,3-dimethylpropylene, etc.
By the generic terms propylene, butylene, pentylene, hexylene etc. without any further definition are meant all the conceivable isomeric forms with the corresponding number of carbon atoms, i.e. propylene includes 1-methylethylene and butylene includes 1-methylpropylene, 2-methylpropylene, 1,1-dimethylethylene and 1,2-dimethylethylene.
The above definition for alkylene also applies if alkylene is part of another group such as for example in HO—Cx-y-alkylenamino or H2N—Cx-y-alkylenoxy.
Unlike alkyl, alkenyl consists of at least two carbon atoms, wherein at least two adjacent carbon atoms are joined together by a C—C double bond. If in an alkyl as hereinbefore defined having at least two carbon atoms, two hydrogen atoms on adjacent carbon atoms are formally removed and the free valencies are saturated to form a second bond, the corresponding alkenyl is formed.
Examples of alkenyl are vinyl (ethenyl), prop-1-enyl, allyl (prop-2-enyl), isopropenyl, but-1-enyl, but-2-enyl, but-3-enyl, 2-methyl-prop-2-enyl, 2-methyl-prop-1-enyl, 1-methyl-prop-2-enyl, 1-methyl-prop-1-enyl, 1-methylidenepropyl, pent-1-enyl, pent-2-enyl, pent-3-enyl, pent-4-enyl, 3-methyl-but-3-enyl, 3-methyl-but-2-enyl, 3-methyl-but-1-enyl, hex-1-enyl, hex-2-enyl, hex-3-enyl, hex-4-enyl, hex-5-enyl, 2,3-dimethyl-but-3-enyl, 2,3-dimethyl-but-2-enyl, 2-methylidene-3-methylbutyl, 2,3-dimethyl-but-1-enyl, hexa-1,3-dienyl, hexa-1,4-dienyl, penta-1,4-dienyl, penta-1,3-dienyl, buta-1,3-dienyl, 2,3-dimethylbuta-1,3-diene etc.
By the generic terms propenyl, butenyl, pentenyl, hexenyl, butadienyl, pentadienyl, hexa-dienyl, heptadienyl, octadienyl, nonadienyl, decadienyl etc. without any further definition are meant all the conceivable isomeric forms with the corresponding number of carbon atoms, i.e. propenyl includes prop-1-enyl and prop-2-enyl, butenyl includes but-1-enyl, but-2-enyl, but-3-enyl, 1-methyl-prop-1-enyl, 1-methyl-prop-2-enyl etc.
Alkenyl may optionally be present in the cis or trans or E or Z orientation with regard to the double bond(s).
The above definition for alkenyl also applies when alkenyl is part of another group such as for example in Cx-y-alkenylamino or Cx-y-alkenyloxy.
Unlike alkylene, alkenylene consists of at least two carbon atoms, wherein at least two adjacent carbon atoms are joined together by a C—C double bond. If in an alkylene as hereinbefore defined having at least two carbon atoms, two hydrogen atoms at adjacent carbon atoms are formally removed and the free valencies are saturated to form a second bond, the corresponding alkenylene is formed.
Examples of alkenylene are ethenylene, propenylene, 1-methylethenylene, butenylene, 1-methylpropenylene, 1,1-dimethylethenylene, 1,2-dimethylethenylene, pentenylene, 1,1-dimethylpropenylene, 2,2-dimethylpropenylene, 1,2-dimethylpropenylene, 1,3-dimethylpropenylene, hexenylene etc.
By the generic terms propenylene, butenylene, pentenylene, hexenylene etc. without any further definition are meant all the conceivable isomeric forms with the corresponding number of carbon atoms, i.e. propenylene includes 1-methylethenylene and butenylene includes 1-methylpropenylene, 2-methylpropenylene, 1,1-dimethylethenylene and 1,2-dimethylethenylene.
Alkenylene may optionally be present in the cis or trans or E or Z orientation with regard to the double bond(s).
The above definition for alkenylene also applies when alkenylene is a part of another group as in for example HO—Cx-y-alkenylenamino or H2N—Cx-y-alkenylenoxy.
Unlike alkyl, alkynyl consists of at least two carbon atoms, wherein at least two adjacent carbon atoms are joined together by a C—C triple bond. If in an alkyl as hereinbefore defined having at least two carbon atoms, two hydrogen atoms in each case at adjacent carbon atoms are formally removed and the free valencies are saturated to form two further bonds, the corresponding alkynyl is formed.
Examples of alkynyl are ethynyl, prop-1-ynyl, prop-2-ynyl, but-1-ynyl, but-2-ynyl, but-3-ynyl, 1-methyl-prop-2-ynyl, pent-1-ynyl, pent-2-ynyl, pent-3-ynyl, pent-4-ynyl, 3-methyl-but-1-ynyl.
By the generic terms propynyl, butynyl, pentynyl, etc. without any further definition are meant all the conceivable isomeric forms with the corresponding number of carbon atoms, i.e. propynyl includes prop-1-ynyl and prop-2-ynyl, butynyl includes but-1-ynyl, but-2-ynyl, but-3-ynyl, 1-methyl-prop-1-ynyl, 1-methyl-prop-2-ynyl.
If a hydrocarbon chain carries both at least one double bond and also at least one triple bond, by definition it belongs to the alkynyl subgroup.
The above definition for alkynyl also applies if alkynyl is part of another group, as in Cx-y-alkynylamino or Cx-y-alkynyloxy, for example.
Unlike alkylene, alkynylene consists of at least two carbon atoms, wherein at least two adjacent carbon atoms are joined together by a C—C triple bond. If in an alkylene as hereinbefore defined having at least two carbon atoms, two hydrogen atoms in each case at adjacent carbon atoms are formally removed and the free valencies are saturated to form two further bonds, the corresponding alkynylene is formed.
Examples of alkynylene are ethynylene, propynylene, 1-methylethynylene, butynylene, 1-methylpropynylene, 1,1-dimethylethynylene, 1,2-dimethylethynylene, pentynylene, 1,1-dimethylpropynylene, 2,2-dimethylpropynylene, 1,2-dimethylpropynylene, 1,3-dimethylpropynylene, hexynylene etc.
By the generic terms propynylene, butynylene, pentynylene, etc. without any further definition are meant all the conceivable isomeric forms with the corresponding number of carbon atoms, i.e. propynylene includes 1-methylethynylene and butynylene includes 1-methylpropynylene, 2-methylpropynylene, 1,1-dimethylethynylene and 1,2-dimethyl-ethynylene.
The above definition for alkynylene also applies if alkynylene is part of another group, as in HO—Cx-y-alkynyleneamino or H2N—Cx-y-alkynyleneoxy, for example.
By heteroatoms are meant oxygen, nitrogen and sulphur atoms.
Haloalkyl (haloalkenyl, haloalkynyl) is derived from the previously defined alkyl (alkenyl, alkynyl) by replacing one or more hydrogen atoms of the hydrocarbon chain independently of one another by halogen atoms, which may be identical or different. If a haloalkyl (haloalkenyl, haloalkynyl) is to be further substituted, the substitutions may take place independently of one another, in the form of mono- or polysubstitutions in each case, on all the hydrogen-carrying carbon atoms.
Examples of haloalkyl (haloalkenyl, haloalkynyl) are —CF3, —CHF2, —CH2F, —CF2CF3, —CHFCF3, —CH2CF3, —CF2CH3, —CHFCH3, —CF2CF2CF3, —CF2CH2CH3, —CF═CF2, —CCl═CH2, —CBr═CH2, —CI═CH2, —CC≡CF3, —CHFCH2CH3, —CHFCH2CF3 etc.
From the previously defined haloalkyl (haloalkenyl, haloalkynyl) are also derived the terms haloalkylene (haloalkenylene, haloalkynylene). Haloalkylene (haloalkenyl, haloalkynyl), unlike haloalkyl, is bivalent and requires two binding partners. Formally, the second valency is formed by removing a hydrogen atom from a haloalkyl. Corresponding groups are for example —CH2F and —CHF—, —CHFCH2F and —CHFCHF— or >CFCH2F etc.
The above definitions also apply if the corresponding halogen groups are part of another group.
Halogen relates to fluorine, chlorine, bromine and/or iodine atoms.
Cycloalkyl is made up of the subgroups monocyclic hydrocarbon rings, bicyclic hydrocarbon rings and spiro-hydrocarbon rings. The systems are saturated. In bicyclic hydrocarbon rings two rings are joined together so that they have at least two carbon atoms together. In spiro-hydrocarbon rings a carbon atom (spiroatom) belongs to two rings together. If a cycloalkyl is to be substituted, the substitutions may take place independently of one another, in the form of mono- or polysubstitutions in each case, on all the hydrogen-carrying carbon atoms. Cycloalkyl itself may be linked as a substituent to the molecule via every suitable position of the ring system.
Examples of cycloalkyl are cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, bicyclo[2.2.0]hexyl, bicyclo[3.2.0]heptyl, bicyclo[3.2.1]octyl, bicyclo[2.2.2]octyl, bicyclo[4.3.0]nonyl (octahydroindenyl), bicyclo[4.4.0]decyl (decahydronaphthalene), bicyclo[2.2.1]heptyl (norbornyl), bicyclo[4.1.0]heptyl (norcaranyl), bicyclo-[3.1.1]heptyl (pinanyl), spiro[2.5]octyl, spiro[3.3]heptyl etc.
The above definition for cycloalkyl also applies if cycloalkyl is part of another group as in Cx-y-cycloalkylamino or Cx-y-cycloalkyloxy, for example.
If the free valency of a cycloalkyl is saturated, then an alicyclic group is obtained.
The term cycloalkylene can thus be derived from the previously defined cycloalkyl. Cycloalkylene, unlike cycloalkyl, is bivalent and requires two binding partners. Formally, the second valency is obtained by removing a hydrogen atom from a cycloalkyl. Corresponding groups are for example
cyclohexyl and




(cyclohexylene).

The above definition for cycloalkylene also applies if cycloalkylene is part of another group as in HO—Cx-y-cycloalkyleneamino or H2N—Cx-y-cycloalkyleneoxy, for example.
Cycloalkenyl is also made up of the subgroups monocyclic hydrocarbon rings, bicyclic hydrocarbon rings and spiro-hydrocarbon rings. However, the systems are unsaturated, i.e. there is at least one C—C double bond but no aromatic system. If in a cycloalkyl as hereinbefore defined two hydrogen atoms at adjacent cyclic carbon atoms are formally removed and the free valencies are saturated to form a second bond, the corresponding cycloalkenyl is obtained. If a cycloalkenyl is to be substituted, the substitutions may take place independently of one another, in the form of mono- or polysubstitutions in each case, on all the hydrogen-carrying carbon atoms. Cycloalkenyl itself may be linked as a substituent to the molecule via every suitable position of the ring system.
Examples of cycloalkenyl are cycloprop-1-enyl, cycloprop-2-enyl, cyclobut-1-enyl, cyclobut-2-enyl, cyclopent-1-enyl, cyclopent-2-enyl, cyclopent-3-enyl, cyclohex-1-enyl, cyclohex-2-enyl, cyclohex-3-enyl, cyclohept-1-enyl, cyclohept-2-enyl, cyclohept-3-enyl, cyclohept-4-enyl, cyclobuta-1,3-dienyl, cyclopenta-1,4-dienyl, cyclopenta-1,3-dienyl, cyclopenta-2,4-dienyl, cyclohexa-1,3-dienyl, cyclohexa-1,5-dienyl, cyclohexa-2,4-dienyl, cyclohexa-1,4-dienyl, cyclohexa-2,5-dienyl, bicyclo[2.2.1]hepta-2,5-dienyl (norborna-2,5-dienyl), bicyclo[2.2.1]hept-2-enyl (norbornenyl), spiro[4.5]dec-2-ene etc.
The above definition for cycloalkenyl also applies when cycloalkenyl is part of another group as in Cx-y-cycloalkenylamino or Cx-y-cycloalkenyloxy, for example.
If the free valency of a cycloalkenyl is saturated, then an unsaturated alicyclic group is obtained.
The term cycloalkenylene can thus be derived from the previously defined cycloalkenyl. Cycloalkenylene, unlike cycloalkenyl, is bivalent and requires two binding partners. Formally the second valency is obtained by removing a hydrogen atom from a cycloalkenyl. Corresponding groups are for example cyclopentenyl and




(cyclopentenylene) etc.

The above definition for cycloalkenylene also applies when cycloalkenylene is part of another group as in HO—Cx-y-cycloalkenyleneamino or H2N—Cx-y-cycloalkenyleneoxy, for example.
Aryl denotes a mono-, bi- or tricyclic group with at least one aromatic carbocycle. Preferably it denotes a a monocyclic group with six carbon atoms (phenyl) or a bicyclic group with nine or ten carbon atoms (two six-membered rings or one six-membered ring with a five-membered ring), wherein the second ring may also be aromatic or, however, may also be saturated or partially saturated. If an aryl is to be substituted, the substitutions may take place independently of one another, in the form of mono- or polysubstitutions in each case, on all the hydrogen-carrying carbon atoms. Aryl itself may be linked as a substituent to the molecule via every suitable position of the ring system.
Examples of aryl are phenyl, naphthyl, indanyl (2,3-dihydroindenyl), indenyl, anthracenyl, phenanthrenyl, tetrahydronaphthyl (1,2,3,4-tetrahydronaphthyl, tetralinyl), dihydronaphthyl (1,2-dihydronaphthyl), fluorenyl etc.
The above definition of aryl also applies when aryl is part of another group as in arylamino or aryloxy, for example.
If the free valency of an aryl is saturated, then an aromatic group is obtained.
The term arylene can also be derived from the previously defined aryl. Arylene, unlike aryl, is bivalent and requires two binding partners. Formally, the second valency is formed by removing a hydrogen atom from an aryl. Corresponding groups are e.g.

    
    
        phenyl and
    
    






(o, m, p-phenylene), naphthyl and





etc.

The above definition for arylene also applies when arylene is part of another group as in HO-aryleneamino or H2N-aryleneoxy for example.
Heterocyclyl denotes ring systems, which are derived from the previously defined cycloalkyl, cycloalkenyl and aryl by replacing one or more of the groups —CH2-independently of one another in the hydrocarbon rings by the groups —O—, —S— or —NH— or by replacing one or more of the groups ═CH— by the group ═N—, wherein a total of not more than five heteroatoms may be present, at least one carbon atom may be present between two oxygen atoms and between two sulphur atoms or between one oxygen and one sulphur atom and the ring as a whole must have chemical stability. Heteroatoms may optionally be present in all the possible oxidation stages (sulphur→sulphoxide —SO, sulphone —SO2—; nitrogen→N-oxide).
A direct result of the derivation from cycloalkyl, cycloalkenyl and aryl is that heterocyclyl is made up of the subgroups monocyclic heterorings, bicyclic heterorings, tricyclic heterorings and spiro-heterorings, which may be present in saturated or unsaturated form. Saturated and unsaturated, non aromatic, heterocyclyl are also defined as heterocycloalkyl. By unsaturated is meant that there is at least one double bond in the ring system in question, but no heteroaromatic system is formed. In bicyclic heterorings two rings are linked together so that they have at least two (hetero)atoms in common. In spiro-heterorings a carbon atom (spiroatom) belongs to two rings together. If a heterocyclyl is substituted, the substitutions may take place independently of one another, in the form of mono- or polysubstitutions in each case, on all the hydrogen-carrying carbon and/or nitrogen atoms. Heterocyclyl itself may be linked as a substituent to the molecule via every suitable position of the ring system. When the heterocyclyl has a nitrogen atom, the preferred position to bind the heterocyclyl substituent to the molecule is the nitrogen atom.
Aromatic heterocyclyl are those heterocyclyl comprising at least two rings, wherein at least one of the rings is aromatic.
Examples of heterocyclyl are tetrahydrofuryl, pyrrolidinyl, pyrrolinyl, imidazolidinyl, thiazolidinyl, imidazolinyl, pyrazolidinyl, pyrazolinyl, piperidinyl, piperazinyl, oxiranyl, aziridinyl, azetidinyl, 1,4-dioxanyl, azepanyl, diazepanyl, morpholinyl, thiomorpholinyl, homomorpholinyl, homopiperidinyl, homopiperazinyl, homothiomorpholinyl, thiomorpholinyl-S-oxide, thiomorpholinyl-S,S-dioxide, 1,3-dioxolanyl, tetrahydropyranyl, tetrahydrothiopyranyl, [1.4]-oxazepanyl, tetrahydrothienyl, homothiomorpholinyl-S,S-dioxide, oxazolidinonyl, dihydropyrazolyl, dihydropyrrolyl, dihydropyrazinyl, dihydropyridyl, dihydro-pyrimidinyl, dihydrofuryl, dihydropyranyl, tetrahydrothienyl-S-oxide, tetrahydrothienyl-S,S-dioxide, homothiomorpholinyl-S-oxide, 2,3-dihydroazet, 2H-pyrrolyl, 4H-pyranyl, 1,4-dihydropyridinyl, 8-azabicyclo[3.2.1]octyl, 8-azabicyclo[5.1.0]octyl, 2-oxa-5-azabicyclo[2.2.1]heptyl, 8-oxa-3-aza-bicyclo[3.2.1]octyl, 3,8-diaza-bicyclo[3.2.1]octyl, 2,5-diaza-bicyclo-[2.2.1]heptyl, 1-aza-bicyclo[2.2.2]octyl, 3,8-diaza-bicyclo[3.2.1]octyl, 3,9-diaza-bicyclo[4.2.1]nonyl, 2,6-diaza-bicyclo[3.2.2]-nonyl, 1,4-dioxa-spiro[4.5]decyl, 1-oxa-3.8-diaza-spiro[4.5]decyl, 2,6-diaza-spiro[3.3]-heptyl, 2,7-diaza-spiro[4.4]nonyl, 2,6-diaza-spiro[3.4]octyl, 3,9-diaza-spiro[5.5]undecyl, 2.8-diaza-spiro[4.5]decyl etc.
Further examples are the structures illustrated below, which may be attached via each hydrogen-carrying atom (exchanged for hydrogen):
















The above definition of heterocyclyl also applies if heterocyclyl is part of another group as in heterocyclylamino or heterocyclyloxy for example.
If the free valency of a heteroyclyl is saturated, then a heterocyclic group is obtained.
The term heterocyclylene is also derived from the previously defined heterocyclyl. Heterocyclylene, unlike heterocyclyl, is bivalent and requires two binding partners. Formally, the second valency is obtained by removing a hydrogen atom from a heterocyclyl. Corresponding groups are for example

    
    
        piperidinyl and
    
    






2,3-dihydro-1H-pyrrolyl and





etc.

The above definition of heterocyclylene also applies if heterocyclylene is part of another group as in HO-heterocyclyleneamino or H2N-heterocyclyleneoxy for example.
Heteroaryl denotes monocyclic heteroaromatic rings or polycyclic rings with at least one heteroaromatic ring, which compared with the corresponding aryl or cycloalkyl (cycloalkenyl) contain, instead of one or more carbon atoms, one or more identical or different heteroatoms, selected independently of one another from among nitrogen, sulphur and oxygen, wherein the resulting group must be chemically stable. The prerequisite for the presence of heteroaryl is a heteroatom and a heteroaromatic system. If a heteroaryl is to be substituted, the substitutions may take place independently of one another, in the form of mono- or polysubstitutions in each case, on all the hydrogen-carrying carbon and/or nitrogen atoms. Heteroaryl itself may be linked as a substituent to the molecule via every suitable position of the ring system, both carbon and nitrogen.
Examples of heteroaryl are furyl, thienyl, pyrrolyl, oxazolyl, thiazolyl, isoxazolyl, isothiazolyl, pyrazolyl, imidazolyl, triazolyl, tetrazolyl, oxadiazolyl, thiadiazolyl, pyridyl, pyrimidyl, pyridazinyl, pyrazinyl, triazinyl, pyridyl-N-oxide, pyrrolyl-N-oxide, pyrimidinyl-N-oxide, pyridazinyl-N-oxide, pyrazinyl-N-oxide, imidazolyl-N-oxide, isoxazolyl-N-oxide, oxazolyl-N-oxide, thiazolyl-N-oxide, oxadiazolyl-N-oxide, thiadiazolyl-N-oxide, triazolyl-N-oxide, tetrazolyl-N-oxide, indolyl, isoindolyl, benzofuryl, benzothienyl, benzoxazolyl, benzothiazolyl, benzisoxazolyl, benzisothiazolyl, benzimidazolyl, indazolyl, isoquinolinyl, quinolinyl, quinoxalinyl, cinnolinyl, phthalazinyl, quinazolinyl, benzotriazinyl, indolizinyl, oxazolopyridyl, imidazopyridyl, naphthyridinyl, benzoxazolyl, pyridopyridyl, purinyl, pteridinyl, benzothiazolyl, imidazopyridyl, imidazothiazolyl, quinolinyl-N-oxide, indolyl-N-oxide, isoquinolyl-N-oxide, quinazolinyl-N-oxide, quinoxalinyl-N-oxide, phthalazinyl-N-oxide, indolizinyl-N-oxide, indazolyl-N-oxide, benzothiazolyl-N-oxide, benzimidazolyl-N-oxide etc.
Further examples are the structures illustrated below, which may be attached via each hydrogen-carrying atom (exchanged for hydrogen):










The above definition of heteroaryl also applies when heteroaryl is part of another group as in heteroarylamino or heteroaryloxy, for example.
If the free valency of a heteroaryl is saturated, a heteroaromatic group is obtained.
The term heteroarylene can therefore be derived from the previously defined heteroaryl. Heteroarylene, unlike heteroaryl, is bivalent and requires two binding partners. Formally, the second valency is obtained by removing a hydrogen atom from a heteroaryl. Corresponding groups are for example pyrrolyl and




etc.

The above definition of heteroarylene also applies when heteroarylene is part of another group as in HO-heteroaryleneamino or H2N-heteroaryleneoxy, for example.
The bivalent groups mentioned above (alkylene, alkenylene, alkynylene etc.) may also be part of composite groups (e.g. H2N—C1-4alkylene- or HO—C1-4alkylene-). In this case one of the valencies is saturated by the attached group (here: —NH2, —OH), so that a composite group of this kind written in this way is only a monovalent substituent over all.
Stereochemistry/Solvates/Hydrates:
Unless stated otherwise a structural formula given in the description or in the claims or a chemical name refers to the corresponding compound itself, but also encompasses the tautomers, stereoisomers, optical and geometric isomers (e.g. enantiomers, diastereomers, E/Z isomers, etc.), racemates, mixtures of separate enantiomers in any desired combinations, mixtures of diastereomers, mixtures of the forms mentioned hereinbefore (if such forms exist) as well as salts, particularly pharmaceutically acceptable salts thereof. The compounds and salts according to the invention may be present in solvated form (e.g. with pharmaceutically acceptable solvents such as e.g. water, ethanol etc.) or in unsolvated form. Generally, for the purposes of the present invention the solvated forms, e.g. hydrates, are to be regarded as of equal value to the unsolvated forms.
Salts:
The term “pharmaceutically acceptable” is used herein to denote compounds, materials, compositions and/or formulations which are suitable, according to generally recognised medical opinion, for use in conjunction with human and/or animal tissue and do not have or give rise to any excessive toxicity, irritation or immune response or lead to other problems or complications, i.e. correspond overall to an acceptable risk/benefit ratio.
The term “pharmaceutically acceptable salts” relates to derivatives of the chemical compounds disclosed in which the parent compound is modified by the addition of acid or base. Examples of pharmaceutically acceptable salts include (without being restricted thereto) salts of mineral or organic acids in relation to basic functional groups such as for example amines, alkali metal or organic salts of acid functional groups such as for example carboxylic acids, etc. These salts include in particular acetate, ascorbate, benzenesulphonate, benzoate, besylate, bicarbonate, bitartrate, bromide/hydrobromide, Ca-edetate/edetate, camsylate, carbonate, chloride/hydrochloride, citrate, edisylate, ethane disulphonate, estolate, esylate, fumarate, gluceptate, gluconate, glutamate, glycolate, glycollylarsnilate, hexylresorcinate, hydrabamine, hydroxymaleate, hydroxynaphthoate, iodide, isothionate, lactate, lactobionate, malate, maleate, mandelate, methanesulphonate, mesylate, methylbromide, methylnitrate, methylsulphate, mucate, napsylate, nitrate, oxalate, pamoate, pantothenate, phenyl acetate, phosphate/diphosphate, polygalacturonate, propionate, salicylate, stearate, subacetate, succinate, sulphamide, sulphate, tannate, tartrate, teoclate, toluenesulphonate, triethiodide, ammonium, benzathine, chloroprocaine, choline, diethanolamine, ethylenediamine, meglumin and procaine. Other pharmaceutically acceptable salts may be formed with cations of metals such as aluminium, calcium, lithium, magnesium, potassium, sodium, zinc, etc. (cf. also Pharmaceutical salts, Birge, S. M. et al., J. Pharm. Sci., (1977), 66, 1-19).
The pharmaceutically acceptable salts of the present invention may be prepared starting from the parent compound, which carries a basic or acidic functionality, by conventional chemical methods. Generally, such salts may be synthesised by reacting the free acid or base form of these compounds with a sufficient amount of the corresponding base or acid in water or an organic solvent such as for example ether, ethyl acetate, ethanol, isopropanol, acetonitrile (or mixtures thereof).
Salts of acids other than those mentioned above, which are useful for example for purifying or isolating the compounds from the reaction mixtures (e.g. trifluoroacetates), are also to be regarded as part of the invention.
In a representation such as for example




the letter A has the function of a ring designation in order to make it easier, for example, to indicate the attachment of the ring in question to other rings.

For bivalent groups in which it is crucial to determine which adjacent groups they bind and with which valency, the corresponding binding partners are indicated in brackets, where to necessary for clarification purposes, as in the following representations:




or (R2)—C(O)NH— or (R2)—NHC(O)—;

Groups or substituents are frequently selected from among a number of alternative groups/substituents with a corresponding group designation (e.g. Ra, Rb etc). If such a group is used repeatedly to define a compound according to the invention in different molecular parts, it must always be borne in mind that the various uses are to be regarded as totally independent of one another.
By a therapeutically effective amount for the purposes of this invention is meant a quantity of substance that is capable of obviating symptoms of illness or of preventing or alleviating these symptoms, or which prolong the survival of a treated patient.
LIST OF ABBREVIATIONS













ACN
acetonitrile


Bu
butyl


conc.
concentrated


d
day(s)


DCM
dichloromethane


DIPEA
diisopropylethyl amine


DMA
N,N-dimethylacetamide


DMAP 
N,N-dimethylpyridin-4-amine


DMF
N,N-dimethylformamide


DMSO
dimethylsulphoxide


Et
ethyl


h
hour(s)


HATU 
N-[(dimethylamino)-(1H-1,2,3-triazolo[4,5-b]pyridin-1-yl)-



methylene]-N-methylmethan-aminium hexafluorophosphate 



N-oxide


HPLC
high performance liquid chromatography


iPr
isopropyl


M
molar


m.p.
melting point


Me
methyl


min
minute(s)


mL
milliliter


MS
mass spectrometry


N
normal


NMP
N-methylpyrrolindinone


NMR
nuclear resonance spectroscopy


NP
normal phase


ppm
part per million


prep
preparative


Rf
retention factor


RP
reversed phase


RT
room temperature


tert
tertiary


TFA
trifluoroacetic acid


THF
tetrahydrofuran


TLC
thin layer chromatography


tR
retention time









Other features and advantages of the present invention will become apparent from the following more detailed examples which exemplarily illustrate the principles of the invention without restricting its scope.
General
Unless stated otherwise, all the reactions are carried out in commercially obtainable apparatuses using methods that are commonly used in chemical laboratories. Starting materials that are sensitive to air and/or moisture are stored under protective gas and corresponding reactions and manipulations therewith are carried out under protective gas (nitrogen or argon).
The compounds according to the invention are named in accordance with IUPAC guidelines using ChemAxon's MarvinView 6.0.0 software. If a compound is to be represented both by a structural formula and by its nomenclature, in the event of a conflict the structural formula is decisive.
Chromatography
Thin layer chromatography is carried out on ready-made TLC plates of silica gel 60 on glass (with fluorescence indicator F-254) made by Merck.
A Biotage Isolera Four apparatus is used for automated preparative NP chromatography together with Interchim Puri Flash columns (50 μm, 12-300 g) or glass columns filled with silica gel made by Millipore (Granula Silica Si-60A 35-70 μm).
Preparative RP HPLC is carried out with columns made by Waters (Sunfire C18, 10 μm, 30×100 mm Part. No. 186003971 or X-Bridge C18, 10 μm, 30×100 mm Part. No. 186003930). The compounds are eluted using either different gradients of H2O/acetonitrile or H2O/MeOH, where 0.2% HCOOH is added to the water, or with different gradients utilizing a basic aqueous buffer solution (1 L water contains 5 mL of an ammonium hydrogencarbonate solution (158 g per 1 L H2O) and 2 mL ammonia (7 mol/l solution in MeOH)) instead of the water-HCOOH-mixture.
The analytical HPLC (reaction monitoring) of intermediate compounds is carried out with columns made by Agilent and Waters. The analytical equipment is also provided with a mass detector in each case.
HPLC Mass Spectroscopy/UV Spectrometry
The retention times/MS-ESI+ for characterising the example compounds according to the invention are determined using an HPLC-MS apparatus (high performance liquid chromatography with mass detector) made by Agilent. Compounds that elute at the injection peak are given the retention time tR=0.
Analytical HPLC Methods












Method_1








HPLC:
Agilent 1100 Series


MS:
Agilent LC/MSD SL


Column:
Waters, Xbridge C18, 2.5 μm, 2.1 × 20 mm


Solvent:
A: 20 mM NH4HCO3/NH3



B: ACN HPLC grade


Detection:
MS: Positive and negative


Mass range:
120-800 m/z


Injection:
5 μL


Flow:
1.00 mL/min


Column temp.:
60° C.









Gradient:
0.00-1.50 min
10% → 95% B



1.50-2.00 min 
95% B



2.00-2.10 min 
95% → 10% B







Method_2








HPLC:
Agilent 1100/1200 Series


MS:
Agilent LC/MSD SL


Column:
Waters X-Bridge BEH C18, 2.5 μm, 2.1 × 30 mm


Eluant:
A: 5 mM NH4HCO3/19 mM NH3 in H2O; 



B: ACN (HPLC grade)


Detection:
MS: Positive and negative mode ESI


Mass range: 
100-800 m/z


Flow:
1.4 ml/min


Column temp.: 
45° C.









Gradient:
0.00-0.01 min:
5% B



0.01-1.00 min: 
5% → 100% B



1.00-1.37 min:
100% B



1.37-1.40 min: 
100% → 5% B







Method_3








HPLC:
Agilent 1100 Series


MS:
Agilent LC/MSD SL


Column:
WatersXBridge C18, 5.0 μm, 2.1 × 50 mm


Eluant:
A: 5 mM NH4HCO3/19 mM NH3 in H2O; 



B: ACN (HPLC grade)


Detection:
MS: Positive and negative mode ESI


Mass range:
105-1200 m/z


Flow:
1.20 ml/min


Column temp.: 
35° C.









Gradient:
0.00-0.01 min:
5% B



0.01-1.25 min:
5% → 95% B



1.25-2.00 min:
95% B



2.00-2.01 min:
95% → 5% B









Preparation of the Compounds According to the Invention

The compounds according to the invention are prepared by methods of synthesis described hereinafter, in which the substituents of the general formulae have the meanings given hereinbefore. These methods are intended as an illustration of the invention, without restricting its subject matter and the scope of the compounds claimed to these examples. Where the preparation of starting compounds is not described, they are commercially obtainable or may be prepared analogously to known compounds or methods described herein. Substances described in literature are prepared according to the published methods.
Unless otherwise specified, the substituents R1 through R4 of the following reaction schemes are as defined in the specification and claims.
The compounds of formula (I) may be prepared according to the following schemes.
One method for the preparation of compounds of formula (I) is depicted in Scheme 1. 4-bromopyridine-2,6-diamine A is converted into the amide derivatives B. Intermediates C can be obtained utilizing a Miyaura borylation reaction. A second amidation reaction leads to intermediates D which can be further transformed into the intermediates K via Suzuki coupling. Alternatively, the introduction of R4 moieties is possible prior to the second amidation step starting from derivatives B or C, e.g. through Suzuki coupling, resulting in intermediates J. The following second amidation reaction leads to intermediates K. Intermediates K are transformed into compounds of the formula (I) via deprotection of the amino function.
Another option in the synthetic route is the introduction of R4 moieties prior to both amidation steps via intermediates H. One method for the synthesis of intermediates H is depicted in Scheme 2. In the shown example starting from trifluoropyridine E, suitable R4 moieties can be introduced via substitution reaction resulting in a difluoropyridine derivative F. Via substitution reaction with an azide and subsequent reduction the intermediates H can be obtained.
The products are isolated by conventional means and preferably purified by chromatography.








Preparation of Compounds B
B1) tert-butyl-N-{1-[(6-amino-4-bromopyridin-2-yl)carbamoyl]ethyl}-N-methylcarbamate




N,N′-dicyclohexylcarbodiimide (24.7 g, 120 mmol) is added slowly to a mixture of 2-{[(tert-butoxy)carbonyl](methyl)amino}propanoic acid (39 g, 192 mmol) in DCM (60 ml) with ice bath cooling. Stirring is continued and the mixture warmed to RT. The mixture is stirred at RT for 30 minutes before 4-bromopyridine-2,6-diamine A (15 g, 80 mmol) in 60 ml DCM and 10 ml NMP is added dropwise. After stirring for 3 days at RT the reaction mixture is diluted with DCM, filtered and extracted with a saturated aqueous sodium hydrogencarbonate solution. The combined organic layers are dried over MgSO4 and concentrated in vacuo. The product is purified by RP HPLC. Yield: 19.8 g (67%). HPLC-MS: M+H=373/375; tR=0.93 min (Method—2).
Preparation of Compounds C
C1) [2-amino-6-(2-{[(tert-butoxy)carbonyl](methyl)amino}propanamido)pyridin-4-yl]boronic acid




1,1′-Bis(diphenylphosphino)ferrocene]dichloropalladium(II) (0.41 g, 0.6 mmol) is added to a mixture of tert-butyl-N-{1-[(6-amino-4-bromopyridin-2-yl)carbamoyl]ethyl}-N-methyl-carbamate B1 (5.2 g, 11.2 mmol), bis(neopentyl glycolato)diboron (5.1 g, 22.4 mmol), KOAc (3.3 g, 33.6 mmol) and DMSO (20 ml) under argon atmosphere and the mixture is stirred at 80° C. for 5 h. The mixture is diluted with DCM and extracted with a saturated aqueous sodium hydrogencarbonate solution. The combined organic layers are dried over MgSO4 and concentrated in vacuo. The product is purified by RP HPLC. Yield: 3.2 g (85%). HPLC-MS: M+H=339; tR=0.51 min (Method—2).
Preparation of Compounds D
D1) [2-(2-{[(tert-butoxy)carbonyl](methyl)amino}propanamido)-6-(5-chloropyridine-2-amido)pyridin-4-yl]boronic acid




5-chloropyridine-2-carbonyl chloride (7.3 g, 41 mmol) is added to a mixture of [2-amino-6-(2-{[tert-butoxy)carbonyl](methyl)amino}propanamido)pyridin-4-yl]boronic acid C1 (10 g, 30 mmol), triethylamine (12.4 ml, 89 mmol) and THF (40 ml). The mixture is stirred at 50° C. for 1 h. A saturated aqueous sodium hydrogencarbonate solution is added at RT and the mixture is extracted with DCM. The combined organic layers are dried over MgSO4 and concentrated in vacuo. The product is purified by RP HPLC. Yield: 8.4 g (60%). HPLC-MS: M+H=478; tR=0.79 min (Method—2).
The following compounds are prepared analogously utilizing 1H,3H-furo[3,4-c]pyridine-6-carbonyl chloride M1, 5-chloro-3-methylpyridine-2-carbonyl chloride M2 or 5-chloro-3-fluoropyridine-2-carbonyl chloride M3:












#
Molecular Structure
Chemical Name







D2




[2-(2-{[(tert-butoxy)carbonyl]- (methyl)amino}propanamido)-6- {1H,3H-furo[3,4-c]pyridine-6- amido}pyridin-4-yl]boronic acid


 


D3




[2-(2-{[(tert-butoxy)- carbonyl](methyl)amino}- propanamido- 6-(5-chloro-3-methylpyridine-2- amido)pyridin-4-yl]boronic acid


 


D4




[2-(2-{[(tert-butoxy)- carbonyl](methyl)amino}- propanamido)- 6-(5-chloro-3-fluoropyridine-2- amido)pyridin-4-yl]boronic acid









Preparation of Compounds F
F1) 1-(2,6-difluoropyridin-4-yl)-7-methyl-1H-indole




Potassium tert-butoxide (410 mg, 3.6 mmol) is added to a mixture of 7-methyl-1H-indole (470 mg, 3.6 mmol) in DMSO (20 ml) with ice cooling. Stirring is continued for 10 minutes before 2,4,6-trifluoropyridine E (350 μl, 3.6 mmol) is added dropwise. The mixture is warmed to RT and stirred for 2 h. The mixture is diluted with DCM and extracted with water. The combined organic layers are dried over MgSO4 and concentrated in vacuo. The product is purified by RP HPLC. Yield: 350 mg (40%). HPLC-MS: M+H=245; tR=1.03 min (Method—2).
Preparation of Compounds G
G1) 1-(2,6-diazidopyridin-4-yl)-7-methyl-1H-indole




A mixture of 1-(2,6-difluoropyridin-4-yl)-7-methyl-1H-indole F1 (240 mg, 0.98 mmol), sodium azide (134 mg, 2.1 mmol) and DMF (1 ml) is stirred at 80° C. for 2 h. The crude mixture is used in the next step without purification.
Preparation of Compounds H
H1) 4-(7-methyl-1H-indol-1-yl)pyridine-2,6-diamine




A crude reaction mixture from the preparation of 1-(2,6-diazidopyridin-4-yl)-7-methyl-1H-indole G1 (approx. 340 mg, 1.2 mmol in 2 ml crude mixture) is diluted with EtOAc (10 ml). Under an atmosphere of nitrogen palladium on activated charcoal (10 mg, 10% Pd) is added. At RT the atmosphere is replaced by hydrogen (5 bar) and stirring is continued for 24 h. The mixture is filtered and extracted with an aqueous 0.5 mol/l sodium hydroxide solution. The combined organic layers are dried over MgSO4 and concentrated in vacuo. The product is purified by RP HPLC. Yield: 120 mg (43%). HPLC-MS: M+H=239; tR=0.81 min (Method—2).
Preparation of Compounds J
J1) tert-butyl-N-(1-{[6-amino-4-(6-methylquinolin-5-yl)pyridin-2-yl]carbamoyl}-ethyl)-N-methylcarbamate




Tetrakis(triphenylphosphine)palladium(0) (310 mg, 0.3 mmol) is added to a mixture of tert-butyl-N-{1-[(6-amino-4-bromopyridin-2-yl)carbamoyl]ethyl}-N-methylcarbamate B1 (1.4 g, 3.8 mmol), (6-methylquinolin-5-yl)boronic acid (0.84 g, 4.5 mmol), sodium carbonate (835 mg, 7.9 mmol), water (5 ml) and dioxane (20 ml) under argon atmosphere at RT and the mixture is stirred at 80° C. for 24 h. The mixture is diluted with DCM and extracted with a saturated aqueous sodium hydrogencarbonate solution. The combined organic layers are dried over MgSO4 and concentrated in vacuo. The product is purified by RP HPLC. Yield: 1.14 g (70%). HPLC-MS: M+H=436; tR=1.64 min (Method—3).
The following compound is prepared analogously utilizing (3-methylpyridin-4-yl)boronic acid:












#
Molecular Structure
Chemical Name







J2




tert-butyl N-(1-{[6-amino- 4-(3-methylpyridin-4- yl)pyridin-2- yl]carbamoyl}ethyl)-N- methylcarbamate









J3) tert-butyl-N-{1-[(6-amino-4-{2,3-dimethylimidazo[1,2-a]pyridin-5-yl}pyridin-2-yl)carbamoyl]ethyl}-N-methylcarbamate




Tetrakis(triphenylphosphine)palladium(0) (205 mg, 0.18 mmol) is added to a mixture of [2-amino-6-(2-{[tert-butoxy)carbonyl](methyl)amino}propanamido)pyridin-4-yl]boronic acid C1 (600 mg, 1.8 mmol), 5-bromo-2,3-dimethylimidazo[1,2-a]pyridine (599 mg, 2.7 mmol), sodium carbonate (564 mg, 5.3 mmol), water (2.5 ml) and dioxane (10 ml) under argon atmosphere at RT and the mixture is stirred at 85° C. for 17 h. The mixture is diluted with DCM and extracted with a saturated aqueous sodium hydrogencarbonate solution. The combined organic layers are dried over MgSO4 and concentrated in vacuo. The product is purified by RP HPLC. Yield: 229 mg (29%). HPLC-MS: M+H=439; tR=0.86 min (Method—2).
The following compounds are prepared analogously utilizing 7-bromo-1-methyl-1H-pyrrolo[3,2-c]pyridine N7,5-bromo-4-methylisoquinoline and 4-bromo-3-chloroquinoline:












#
Molecular Structure
Chemical Name







J4




tert-butyl N-{1-[(6-amino- 4-{1-methyl-1H- pyrrolo[3,2-c]pyridin-7- yl}pyridin-2- yl)carbamoyl]ethyl}-N- methylcarbamate


 









J5




tert-butyl N-(1-{[6-amino- 4-(4-methylisoquinolin-5- yl)pyridin-2- yl]carbamoyl}ethyl)-N- methylcarbamate


 


J6




tert-butyl N-(1-{[6-amino- 4-(3-chloroquinolin-4- yl)pyridin-2- yl]carbamoyl}ethyl)-N- methylcarbamate









J7) tert-butyl-N-(1-{[6-amino-4-(7-methyl-1H-indol-1-yl)pyridin-2-yl]carbamoyl}-ethyl)carbamate




A mixture of 2-{[tert-butoxy)carbonyl]amino}propanoic acid (95 mg, 0.50 mmol), NMP (3 ml), DIPEA (343 μl, 2.0 mmol) and HATU (255 mg, 0.67 mmol) is stirred at RT for 15 minutes. 4-(7-methyl-1H-indol-1-yl)pyridine-2,6-diamine 111 (80 mg, 0.33 mmol) is added and the mixture stirred at RT for 18 h. HATU (255 mg, 0.67 mmol) is added and stirring continued for 1 h. The mixture is filtered and the product purified by RP HPLC. Yield: 40 mg (29%). HPLC-MS: M+H=410; tR=0.95 min (Method—2).
J8) tert-butyl-N-{1-[(6-amino-4-chloropyridin-2-yl)carbamoyl]ethyl}carbamate




HATU (2.7 g, 7.1 mmol) is added to a mixture of 2-{[(tert-butoxy)carbonyl]amino}-propanoic acid (850 mg, 4.5 mmol), 4-chloropyridine-2,6-diamine (1 g, 7.0 mmol), DIPEA (4.6 ml, 26.5 mmol) and NMP (7 ml) and the mixture is stirred at RT for 18 h. The mixture is concentrated in vacuo and the product purified by RP HPLC. Yield: 770 mg (55%). HPLC-MS: M+H=315 (Method—2).
J9 is prepared analogously:












#
Molecular Structure
Chemical Name







J9




tert-butyl N-{1- [(6- aminopyridin-2- yl)carbamoyl]- ethyl}carbamate









Preparation of Examples via Compounds K
K1) tert-butyl-N-(1-{[6-(5-chloropyridine-2-amido)-4-{1,3-dimethyl-1H-pyrazolo-[4,3-d]pyrimidin-7-yl}pyridin-2-yl]carbamoyl}ethyl)-N-methylcarbamate




Tetrakis(triphenylphosphine)palladium(0) (3.9 mg, 3.3 μmol) is added to a mixture of [2-(2-{[(tert-butoxy)carbonyl](methyl)amino}propanamido)-6-(5-chloropyridine-2-amido)pyridin-4-yl]boronic acid D1 (20 mg, 42 μmol), 7-chloro-1,3-dimethyl-1H-pyrazolo[4,3-d]pyrimidine (9.2 mg, 50 μmol), sodium carbonate (10.7 mg, 101 μmol), water (0.25 ml) and dioxane (1 ml) under argon atmosphere at RT and is stirred at 90° C. for 4 h. The mixture is concentrated in vacuo and the product purified by RP HPLC. Yield: 18 mg (93%). HPLC-MS: M+H=580/578; tR=1.08 min (Method—2).
K63a is prepared analogously from D1 utilizing 5,7-dichloro-1,3-dimethyl-1H-pyrazolo-[4,3-d]pyrimidine:












#
Molecular Structure
Chemical Name







K63a




tert-butyl N-{1-[(4-{5-chloro- 1,3-dimethyl-1H-pyrazolo[4,3- d]pyrimidin-7-yl}-6-(5- chloropyridine-2-amido)pyridin- 2-yl)carbamoyl]ethyl}-N- methylcarbamate









K63b) tert-butyl N-(1-{[6-(5-chloropyridine-2-amido)-4-{5-methoxy-1,3-dimethyl-1H-pyrazolo[4,3-d]pyrimidin-7-yl}pyridin-2-yl]carbamoyl}ethyl)-N-methyl-carbamate




A mixture of tert-butyl N-{1-[(4-{5-chloro-1,3-dimethyl-1H-pyrazolo[4,3-d]pyrimidin-7-yl}-6-(5-chloropyridine-2-amido)pyridin-2-yl)carbamoyl]ethyl}-N-methylcarbamate K63a (54 mg, 88 μmol), sodium methoxide (24 mg, 439 μmol) and methanol (400 μl) is stirred at 50° C. for 70 minutes. At RT water (10 ml) is added and the mixture extracted with DCM. The combined organic layers are dried over MgSO4 and concentrated in vacuo. The product is purified by RP HPLC. Yield: 30 mg (56%). HPLC-MS: M+H=610; tR=1.12 min (METHOD—2).
Example 1
5-chloro-N-(4-{1,3-dimethyl-1H-pyrazolo[4,3-d]pyrimidin-7-yl}-6-[2-(methylamino)propanamido]pyridin-2-yl)pyridine-2-carboxamide




tert-butyl-N-(1-{[6-(5-chloropyridine-2-amido)-4-{1,3-dimethyl-1H-pyrazolo[4,3-d]-pyrimidin-7-yl}pyridin-2-yl]carbamoyl}ethyl)-N-methylcarbamate K1 (18 mg, 38 μmol) in DCM:TFA=4:1 (2 ml) is stirred at RT for 15 minutes. Toluene (30 ml) is added and the mixture concentrated in vacuo. The product is purified by RP HPLC. Yield: 9 mg (60%). HPLC-MS: M+H=480; tR=1.17 min (METHOD—1).
The following examples are prepared analogously from D1-D4 utilizing 7-chloro-1,3-dimethyl-1H-pyrazolo[4,3-d]pyrimidine, 4-iodo-3,5-dimethyl-1,2-oxazole, 4-iodopyridine-3-carbonitrile, 5-bromo-4,6-dimethylpyrimidine, 3-iodo-2-methylimidazo[1,2-a]pyridine, 7-bromo-1-methyl-1H-indazole, 1-chloro-8-methylisoquinoline, 4-chloro-5-methyl-quinazoline, 3-iodo-2,5-dimethylimidazo[1,2-a]pyridine N1,5-bromo-2,3-dimethyl-imidazo[1,2-a]pyridine, 4-bromo-2,3-dimethyl-2H-indazole, 4-bromo-1,3-dimethyl-1H-indazole, 4-chloro-5-fluoroquinazoline, 4-chloro-5,6-dimethylfuro[2,3-d]pyrimidine, 6-chloro-7,8-dimethyl-7H-purine N2, 3-iodo-1-methyl-1H-pyrazolo[3,4-d]pyrimidin-4-amine, 5-chloro-3-iodoimidazo[1,2-a]pyridine, 1-iodo-2-methoxynaphthalene, 5-iodo-6-methoxyquinoxaline N3,7-chloro-1,3,5-trimethyl-1H-pyrazolo[4,3-d]pyrimidine, 4,5-di-chloroquinazoline, 4-bromo-5,7-difluoroquinoline, 5-bromo-6-methoxy-4-methylquinoline N4, 5-iodo-6-methoxynaphthalene-2-carbonitrile N5,7-bromo-1,2,4,6-tetramethyl-1H,2H,3H-pyrazolo[4,3-c]pyridin-3-one N6,4-bromo-3,5,7-trichloro-2-methylquinoline, 7-chloro-1,2-dimethyl-1H,2H,3H-pyrazolo[3,4-c]pyridin-3-one N8, 4-chloro-2,5,6,7-tetra-methyl-5H-pyrrolo[3,2-d]pyrimidine N9c or from tert-butyl N-(1-{[6-(5-chloropyridine-2-amido)-4-{5-methoxy-1,3-dimethyl-1H-pyrazolo[4,3-d]pyrimidin-7-yl}pyridin-2-yl]carbamoyl}ethyl)-N-methylcarbamate K63b directly by Boc-cleavage:
















HPLC-MS


#
Molecular Structure
Chemical Name
(METHOD_1)


















2




N-(4-{1,3-dimethyl-1H- pyrazolo[4,3-d]pyrimidin-7- yl}-6-[2- (methylamino)propanamido]- pyridin-2-yl)-1H,3H-furo[3,4- c]pyridine-6-carboxamide
M + H = 488; tR = 1.03


 


3




5-chloro-N-[4-(dimethyl-1,2- oxazol-4-yl)-6-[2- (methylamino)propanamido]- pyridin-2-yl]pyridine-2- carboxamide
M + H = 429; tR = 1.26


 


4




5-chloro-N-[4-(3- cyanopyridin-4-yl)-6-[2- (methylamino)propanamido]- pyridin-2-yl]pyridine-2- carboxamide
M + H = 436; tR = 1.15


 


5




5-chloro-N-[4-(4,6- dimethylpyrimidin-5-yl)-6- [2- (methylamino)propanamido]- pyridin-2-yl]pyridine-2- carboxamide
M + H = 440; tR = 1.11


 


6




5-chloro-N-{6-[2- (methylamino)propanamido]- 4-{2-methylimidazo[1,2- a]pyridin-3-yl}pyridin-2- yl}pyridine-2-carboxamide
M + H = 464; tR = 1.19


 


7




5-chloro-N-[4-(1-methyl-1H- indazol-7-yl)-6-[2- (methylamino)propanamido]- pyridin-2-yl]pyridine-2- carboxamide
M + H = 464; tR = 1.31


 


8




5-chloro-N-{6-[2- (methylamino)propanamido]- 4-(8-methylisoquinolin-1- yl)pyridin-2-yl}pyridine-2- carboxamide
M + H = 475; tR = 1.33


 


9




5-chloro-N-{6-[2- (methylamino)propanamido]- 4-(5-methylquinazolin-4- yl)pyridin-2-yl}pyridine-2- carboxamide
M + H = 476; tR = 1.23


 


10




5-chloro-N-(4-{2,5- dimethylimidazo[1,2- a]pyridin-3-yl]-6-[2- (methylamino)propanamido]- pyridin-2-yl)pyridine-2- carboxamide
M + H = 478; tR = 1.22


 


11




5-chloro-N-(4-{2,3- dimethylimidazo[1,2- a]pyridin-3-yl]-6-[2- (methylamino)propanamido]- pyridin-2-yl)pyridine-2- carboxamide
M + H = 478; tR = 1.23


 


12




5-chloro-N-[4-(2,3-dimethyl- 2H-indazol-4-yl)-6-[2- (methylamino)propanamido]- pyridin-2-yl]pyridine-2- carboxamide
M + H = 478; tR = 1.25


 


13




5-chloro-N-[4-(1,3-dimethyl- 1H-indazol-4-yl)-6-[2- (methylamino)propanamido]- pyridin-2-yl]pyridine-2- carboxamide
M + H = 478; tR = 1.33


 


14




5-chloro-N-[4-(5- fluoroquinazolin-4-yl)-6-[2- (methylamino)propanamido]- pyridin-2-yl]pyridine-2- carboxamide
M + H = 480; tR = 1.22


 


15




5-chloro-N-(4-{5,6- dimethylfuro[2,3- d]pyrimidin-4-yl}-6-[2- (methylamino)propanamido]- pyridin-2-yl)pyridine-2- carboxamide
M + H = 480; tR = 1.31


 


16




5-chloro-N-[4-(7,8-dimethyl- 7H-purin-6-yl)-6-[2- (methylamino)propanamido]- pyridin-2-yl]pyridine-2- carboxamide
M + H = 480; tR = 0.98


 


17




N-(4-{4-amino-1-methyl-1H- pyrazolo[3,4-d]pyrimidin-3- yl}-6-[2- (methylamino)propanamido]- pyridin-2-yl)pyridine-2- carboxamide
M + H = 447; tR = 0.95


 


18




5-chloro-N-(4-{5- chloroimidazo[1,2-a]pyridin- 3-yl}-6-[2- (methylamino)propanamido]- pyridin-2-yl)pyridine-2- carboxamide
M + H = 484; tR = 1.23


 


19




5-chloro-N-[4-(2- methoxynaphthalen-1-yl)-6- [2- (methylamino)propanamido]- pyridin-2-yl]pyridine-2- carboxamide
M + H = 490; tR = 1.48


 


20




5-chloro-N-[4-(6- methoxyquinoxalin-5-yl)-6- [2- (methylamino)propanamido]- pyridin-2-yl]pyridine-2- carboxamide
M + H = 492; tR = 1.15


 


21




5-chloro-N-{6-[2- (methylamino)propanamido]- 4-{trimethyl-1H- pyrazolo[4,3-d]pyrimidin-7- yl}pyridin-2-yl}pyridine-2- carboxamide
M + H = 494; tR = 1.22


 


22




5-chloro-N-[4-(5- chloroquinazolin-4-yl)-6-[2- (methylamino)propanamido]- pyridin-2-yl]pyridine-2- carboxamide
M + H = 496; tR = 1.28


 


23




5-chloro-N-[4-(5,7- difluoroquinolin-4-yl)-6-[2- (methylamino)propanamido]- pyridin-2-yl]pyridine-2- carboxamide
M + H = 497; tR = 1.34


 


24




5-chloro-N-[4-(6-methoxy-4- methylquinolin-5-yl)-6-[2- (methylamino)propanamido]- pyridin-2-yl]pyridine-2- carboxamide
M + H = 505; tR = 1.24


 


25




5-chloro-N-[4-(6-cyano-2- methoxynaphihalen-1-yl)-6- [2-(methylamino)propanamido]- pyridin-2-yl]pyridine-2-carboxamide
M + H = 515; tR = 1.40


 


26




5-chloro-N-{6-[2- (methylamino)propanamido]- 4-{1,2,4,6-tetramethyl-3-oxo- 1H,2H,3H-pyrazolo[4,3- c]pyridin-7-yl}pyridin-2- yl}pyridine-2-carboxamide
M + H = 523; tR = 1.06


 


27




5-chloro-N-{6-[2- (methylamino)propanamido]- 4-(3,5,7-trichloro-2- methylquinolin-4-yl)pyridin- 2-yl}pyridine-2-carboxamide
M + H = 579/577; tR = 1.65


 


58




5-chloro-N-(4-{1,2-dimethyl- 3-oxo-1H,2H,3H-pyrazolo- [3,4-c]pyridin-7-yl}-6-[2- (methylamino)propanamido]- pyridin-2-yl)pyridine-2- carboxamide
M + H = 495; tR = 1.08


 


59




5-chloro-N-{6-[2- (methylamino)propanamido]- 4-{tetramethyl-5H- pyrrolo[3,2-d]pyrimidin-4- yl}pyridin-2-yl}pyridine-2- carboxamide
M + H = 507; tR = 1.22


 


60




5-chloro-3-methyl-N-{6-[2- (methylamino)propanamido]- 4-{trimethyl-1H-pyrazolo- [4,3-d]pyrimidin-7-yl}- pyridin-2-yl}pyridine-2- carboxamide
M + H = 508; tR = 1.32


 


61




5-chloro-N-(4-{1,3-dimethyl- 1H-pyrazolo[4,3-d]pyrimidin- 7-yl}-6-[2-(methylamino)- propanamido]pyridin-2-yl)-3- methylpyridine-2- carboxamide
M + H = 494; tR = 1.29


 


62




5-chloro-3-fluoro-N-{6-[2- (methylamino)propanamido]- 4-{trimethyl-1H-pyrazolo- [4,3-d]pyrimidin-7-yl}- pyridin-2-yl)pyridine-2- carboxamide
M + H = 512; tR = 1.16


 


63




5-chloro-N-(4-{5-methoxy- 1,3-dimethyl-1H- pyrazolo[4,3-d]pyrimidin-7- yl}-6-[2-(methylamino)- propanamido]pyridin-2- yl)pyridine-2-carboxamide
M + H = 510; tR = 1.29









K28) tert-butyl-N-{1-[(6-{1H,3H-furo[3,4-c]pyridine-6-amido}-4-(6-methylquinolin-5-yl)pyridin-2-yl)carbamoyl]ethyl}-N-methylcarbamate




1H,3H-furo[3,4-c]pyridine-6-carbonyl chloride M1 (33 mg, 0.2 mmol) is added to tert-butyl-N-(1-{[6-amino-4-(6-methylquinolin-5-yl)pyridin-2-yl]carbamoyl}ethyl)-N-methyl-carbamate J1 (60 mg, 0.14 mmol) and DIPEA (59 μl, 0.34 mmol) in THF (1 ml) and the mixture is stirred at 50° C. for 2 h. The mixture is concentrated in vacuo and the product purified by RP HPLC. Yield: 17 mg (21%). HPLC-MS: M+H=583; tR=1.01 min (Method—2).
Example 28
N-{6-[2-(methylamino)propanamido]-4-(6-methylquinolin-5-yl)pyridin-2-yl}-1H,3H-furo[3,4-c]pyridine-6-carboxamide




tert-butyl-N-{1-[(6-{1H,3H-furo[3,4-c]pyridine-6-amido}-4-(6-methylquinolin-5-yl)-pyridin-2-yl)carbamoyl]ethyl}-N-methylcarbamate K28 (17 mg, 29 μmol) in DCM:TFA=4:1 (2 ml) is stirred at RT for 15 minutes. Toluene (30 ml) is added and the mixture concentrated in vacuo. The product is purified by RP HPLC. Yield: 5 mg (36%). HPLC-MS: M+H=483; tR=1.15 min (METHOD—1).
The following examples are prepared analogously from J1-J7, utilizing 5-methylpyridine-2-carbonyl chloride, 5-cyanopyridine-2-carbonyl chloride, quinazoline-2-carbonyl chloride, 5-fluoropyridine-2-carbonyl chloride, 5-methoxypyridine-2-carbonyl chloride, 5-methylpyrazine-2-carbonyl chloride, isoquinoline-3-carbonyl chloride, quinoline-2-carbonyl chloride, pyrimidine-4-carbonyl chloride, 1-benzofuran-2-carbonyl chloride, pyridine-2-carbonyl chloride, 6-methylpyridine-2-carbonyl chloride, 1-methyl-1H-pyrazole-3-carbonyl chloride, 4-chloropyridine-2-carbonyl chloride, pyridazine-3-carbonyl chloride, isoquinoline-6-carbonyl chloride, 1-methyl-1H-imidazole-4-carbonyl chloride, 5-phenyl-1,2-oxazole-3-carbonyl chloride, 5-chloropyridine-2-carbonyl chloride, 1H,3H-furo[3,4-c]pyridine-6-carbonyl chloride M1, 2-phenylacetyl chloride, 1H-indole-2-carbonyl chloride or 5-methoxypyridine-2-carbonyl chloride:
















HPLC-MS


#
Molecular Structure
Chemical Name
(METHOD_1)







29




5-methyl-N-{6-[2- (methylamino)propanamido]- 4-(6-methylquinolin-5- yl)pyridin-2-yl}pyridine-2- carboxamide
M + H = 455; tR = 1.27


 


30




5-cyano-N-{6-[2- (methylamino)propanamido]- 4-(6-methylquinolin-5- yl)pyridin-2-yl}pyridine-2- carboxamide
M + H = 466; tR = 1.10


 


31




N-{6-[2- (methylamino)propanamido]- 4-(6-methylquinolin-5- yl)pyridin-2-yl}quinazoline- 2-carboxamide
M + H = 492; tR = 1.11


 


32




5-fluoro-N-{6-[2- (methylamino)propanamido]- 4-(6-methylquinolin-5- yl)pyridin-2-yl}pyridine-2- carboxamide
M + H = 459; tR = 1.22


 


33




5-methoxy-N-{6-[2- (methylamino)propanamido]- 4-(6-methylquinolin-5- yl)pyridin-2-yl}pyridine-2- carboxamide
M + H = 471; tR = 1.22


 


34




5-methyl-N-{6-[2- (methylamino)propanamido]- 4-(6-methylquinolin-5- yl)pyridin-2-yl}pyrazine-2- carboxamide
M + H = 456; tR = 1.1


 


35




N-{6-[2- (methylamino)propanamido]- 4-(6-methylquinolin-5- yl)pyridin-2-yl}isoquinoline- 3-carboxamide
M + H = 491; tR = 1.35


 


36




N-{6-[2- (methylamino)propanamido] - 4-(6-methylquinolin-5- yl)pyridin-2-yl}quinoline-2- carboxamide
M + H = 491; tR = 1.39


 


37




N-{6-[2- (methylamino)propanamido]- 4-(6-methylquinolin-5- yl)pyridin-2-yl)pyrimidine-4- carboxamide
M + H = 442; tR = 1.04


 


38




N-{6-[2- (methylamino)propanamido]- 4-(6-methylquinolin-5- yl)pyridin-2-yl)-1- benzofuran-2-carboxamide
M + H = 480; tR = 1.27


 


39




N-{6-[2- (methylamino)propanamido]- 4-(6-methylquinolin-5- yl)pyridin-2-yl}pyridine-2- carboxamide
M + H = 441; tR = 1.18


 


40




6-methyl-N-{6-[2- (methylamino)propanamido]- 4-(6-methylquinolin-5- yl)pyridin-2-yl}pyridine-2- carboxamide
M + H = 455 tR = 1.26


 


41




1-methyl-N-{6-[2- (methylamino)propanamido]- 4-(6-methylquinolin-5- yl)pyridin-2-yl}-1H-pyrazole- 3-carboxamide
M + H = 444; tR = 1.05


 


42




4-chloro-N-{6-[2- (methylamino)propanamido]- 4-(6-methylquinolin-5- yl)pyridin-2-yl}pyridine-2- carboxamide
M + H = 475; tR = 1.31


 


43




N-{6-[2- (methylamino)propanamido]- 4-(6-methylquinolin-5- yl)pyridin-2-yl}pyridazine-3- carboxamide
M + H = 442; tR = 0.99


 


44




N-{6-[2- (methylamino)propanamido]- 4-(6-methylquinolin-5- yl)pyridin-2-yl}isoquinoline- 6-carboxamide
M + H = 491; tR = 1.08


 


45




1-methyl-N-{6-[2- (methylamino)propanamido]- 4-(6-methylquinolin-5- yl)pyridin-2-yl}-1H- imidazole-4-carboxamide
M + H = 444; tR = 0.96


 


46




N-{6-[2- (methylamino)propanamido]- 4-(6-methylquinolin-5- yl)pyridin-2-yl}-5-phenyl- 1,2-oxazole-3-carboxamide
M + H = 507; tR = 1.36


 


47




5-chloro-N-{6-[2- (methylamino)propanamido]- 4-(3-methylpyridin-4- yl)pyridin-2-yl}pyridine-2- carboxamide
M + H = 425; tR = 1.17


 


48




N-(4-{2,3- dimethylimidazo[1,2- a]pyridin-5-yl}-6-[2- (methylamino)propanamido] pyridin-2-yl)-1H,3H-furo[3,4- c]pyridine-6-carboxamide
M + H = 486; tR = 1.07


 


49




N-(4-{2,3- dimethylimidazo[1,2- a]pyridin-5-yl}-6-(2- phenylacetamido)pyridin-2- yl)-2- (methylamino)propanamide
M + H = 457; tR = 1.10


 


50




N-(4-{2,3- dimethylimidazo[1,2- a]pyridin-5-yl}-6-[2- (methylamino)propanamido] pyridin-2-yl)-1H-indole-2- carboxamide
M + H = 482; tR = 1.15


 


51




N-(4-{2,3- dimethylimidazo[1,2- a]pyridin-5-yl}-6-[2- (methylamino)propanamido] pyridin-2-yl)-5- methoxypyridine-2- carboxamide
M + H = 474; tR = 1.16


 


52




5-chloro-N-(4-{1-methyl-1H- pyrrolo[3,2-c]pyridin-7-yl}- 6-[2- (methylamino)propanamido] pyridin-2-yl)pyridine-2- carboxamide
M + H = 464; tR = 1.18


 


53




5-chloro-N-(4-{1-methyl-1H- pyrrolo[3,2-c]pyridin-7-yl)- (methylamino)propanamido] pyridin-2-yl)pyridine-2- carboxamide
M + H = 475; tR = 1.30


 


54




5-chloro-N-[4-(3- chloroquinolin-4-yl)-6-[2- (methylamino)propanamido] pyridin-2-yl]pyridine-2- carboxamide
M + H = 495; tR = 1.40


 


55




N-[6-(2-aminopropanamido)- 4-(7-methyl-1H-indol-1- yl)pyridin-2-yl]-5- chloropyridine-2- carboxamide
M + H = 449; tR = 1.38









K56) tert-butyl-N-(1-{[4-chloro-6-(pyridine-2-amido)pyridin-2-yl]carbamoyl}-ethyl)carbamate




HATU (180 mg, 0.47 mmol) is added to a mixture of tert-butyl-N-{1-[(6-amino-4-chloropyridin-2-yl)carbamoyl]ethyl}carbamate J8 (100 mg, 0.32 mmol), pyridine-2-carboxylic acid (60 mg, 0.49 mmol) and DIPEA in NMP (1.5 ml) and the mixture is stirred at RT for 2 h and stirring continued at 50° C. for 17 h. The mixture is concentrated in vacuo and the product purified by RP HPLC. Yield: 27 mg (20%). HPLC-MS: M+H=420 (Method—2).
Example 56
N-[6-(2-aminopropanamido)-4-chloropyridin-2-yl]pyridine-2-carboxamide




tert-butyl-N-(1-{[4-chloro-6-(pyridine-2-amido)pyridin-2-yl]carbamoyl}ethyl)carbamate K56 (27 mg, 64 μmol) in DCM:TFA=9:1 (3 ml) is stirred at RT for 2 h. The mixture is diluted with DCM and extracted with a saturated aqueous sodium hydrogencarbonate solution. The combined organic layers are dried over MgSO4 and concentrated in vacuo. The product is purified by RP HPLC. Yield: 12 mg (58%). HPLC-MS: M+H=320; tR=1.57 min (METHOD—1).
The following example is prepared analogously from J9:
















HPLC-MS


#
Molecular Structure
Chemical Name
(METHOD_1)







57




N-[6-(2- aminopropanamido)pyridin- 2-yl]-5-methylpyridine-2- carboxamide
M + H = 300; tR = 1.41









Preparation of Additional Building Blocks M and N
M1) 1H,311-furo[3,4-c]pyridine-6-carbonyl chloride




Ethyl 1H,3H-furo[3,4-c]pyridine-6-carboxylate (1.5 g, 7.8 mmol) in 10 ml of a potassium hydroxide solution (EtOH:water=1:1) is stirred at RT for 1 h. The mixture is made neutral with hydrochloric acid (1 mol/l) and lyophilized. The crude mixture containing 1H,3H-furo[3,4-c]pyridine-6-carboxylic acid is used directly without further purification.
Thionyl chloride (134 μl, 1.8 mmol) is added to a mixture of crude 1H,3H-furo[3,4-c]pyridine-6-carboxylic acid (30 mg, 0.18 mmol) in DCM (2 ml) with DMF (100 μl). The to mixture is stirred at 40° C. for 1 h. The mixture is concentrated in vacuo and the crude product used directly without further purification.
M2) 5-Chloro-3-methylpyridine-2-carbonyl chloride




Thionyl chloride (71 μl, 962 μmol) is added to a mixture of 5-chloro-3-methyl-pyridine-2-carboxylic acid (150 mg, 874 μmol), toluene (1 ml) and DMF (20 μl). The mixture is heated to 60° C. for 1 hour. The mixture is concentrated in vacuo and the crude product used directly without further purification.
M3 is prepared analogously:












#
Molecular Structure
Chemical Name







M3




5-chloro-3-fluoropyridine- 2-carbonyl chloride









N1) 3-Iodo-2,5-dimethyl-imidazo[1,2-a]pyridine




A mixture of 2,5-dimethylimidazo[1,2-a]pyridine (0.5 g, 3.4 mmol), N-iodosuccinimide (770 mg, 3.4 mmol) and ACN (5 ml) is stirred at RT for 45 minutes. The mixture is diluted with DCM and extracted with an aqueous solution sodium thiosulfate. The combined organic layers are dried over MgSO4 and concentrated in vacuo. The product is purified by RP HPLC. Yield: 775 mg (83%). HPLC-MS: M+H=273; tR=1.02 min (METHOD—1).
N2) 6-chloro-7,8-dimethyl-7H-purine




A mixture of 6-chloro-8-methyl-7H-purine (0.9 g, 5.3 mmol), cesium carbonate (2.6 g, 8 mmol) and NMP (5 ml) is stirred at RT for 15 minutes. Dimethyl sulfate (0.56 ml, 5.9 mmol) is added dropwise and stirring continued for 2 h. A saturated aqueous solution of sodium hydrogencarbonate is added and the mixture extracted with DCM. The combined organic layers are dried over MgSO4 and concentrated in vacuo. The product is purified by NP chromatography. Yield: 102 mg (11%). HPLC-MS: M+H=183; tR=0.21 min (METHOD—1).
N3) 5-iodo-6-methoxyquinoxaline




A mixture of 5-iodo-6-methoxyquinoxaline (50 mg, 0.31 mmol), N-iodosuccinimide (77 mg, 0.34 mmol) in ACN (1 ml) and TFA (7 μl) is stirred at RT for 1 h. The mixture is warmed to 50° C. and stirred for 24 h. A saturated aqueous solution of sodium hydrogencarbonate is added at RT and the mixture extracted with DCM. The combined organic layers are dried over MgSO4 and concentrated in vacuo. The product is purified by RP HPLC. Yield: 71 mg (80%). HPLC-MS: M+H=287; tR=0.88 min (METHOD—1).
N4) 5-bromo-6-methoxy-4-methylquinoline




N-bromosuccinimide (0.57 g, 3.2 mmol) is added at RT to a mixture of 6-methoxy-4-methylquinoline (0.5 g, 2.9 mmol) in conc. sulfuric acid (5 ml). The mixture is stirred for 1 h and poured onto ice-water. The water phase is made basic with an aqueous solution of sodium hydroxide (1 mol/l) and extracted with DCM. The combined organic layers are dried over MgSO4 and concentrated in vacuo. The product is purified by RP HPLC. Yield: 256 mg (35%). HPLC-MS: M+H=252/254; tR=1.09 min (METHOD—1).
N5) 5-iodo-6-methoxynaphthalene-2-carbonitrile




A mixture of 6-methoxynaphthalene-2-carbonitrile (1.0 g, 5.5 mmol), N-iodosuccinimide (1.4 g, 6.0 mmol) in ACN (10 ml) and TFA (125 μl) is stirred at RT for 4 h. A saturated aqueous solution of sodium hydrogencarbonate is added and the mixture extracted with DCM. The combined organic layers are extracted with an aqueous solution of sodium thiosulfate, dried over MgSO4 and concentrated in vacuo. The product is purified by RP HPLC. Yield: 1.68 g (99%). HPLC-MS: tR=1.32 min (METHOD—1).
N6) 7-bromo-1,2,4,6-tetramethyl-1H,2H,3H-pyrazolo[4,3-c]pyridin-3-one




A mixture of 4-chloro-2,6-dimethyl-nicotinic acid (0.96 g, 5.2 mmol), 1,2-dimethyl-hydrazine dihydrochloride (0.83 g, 6.2 mmol), DIPEA (3.5 ml, 20.7 mmol) and NMP (5 ml) is heated in the microwave at 100° C. for 45 minutes. The mixture is diluted with DCM and extracted with a saturated aqueous sodium hydrogencarbonate solution. The combined organic layers are dried over MgSO4 and concentrated in vacuo. 1,2,4,6-tetramethyl-1H,2H,3H-pyrazolo[4,3-c]pyridin-3-one is purified by RP HPLC. Yield: 0.35 g (35%). HPLC-MS: M+H=192; tR=0.28 min (METHOD—1).
A mixture of 1,2,4,6-tetramethyl-1H,2H,3H-pyrazolo[4,3-c]pyridin-3-one (0.33 g, 1.7 mmol), NBS (0.34 g, 1.9 mmol) and conc. H2SO4 (8 ml) is stirred at RT for 18 h. The mixture is poured onto ice-water. The water phase is made basic with an aqueous solution of sodium hydroxide (1 mol/l) and extracted with DCM. The combined organic layers are dried over MgSO4 and concentrated in vacuo. 7-bromo-1,2,4,6-tetramethyl-1H,2H,3H-pyrazolo[4,3-c]pyridin-3-one is used without further purification. Yield: 0.37 g (80%). HPLC-MS: M+H=270/272; tR=0.77 min (METHOD—1).
N7) 7-bromo-1-methyl-1H-pyrrolo[3,2-c]pyridine




Sodium hydride (0.25 g, 6.2 mmol) is added under ice bath cooling to a mixture of 7-bromo-1H-pyrrolo[3,2-c]pyridine (0.8 g, 4.1 mmol) in DMF (10 ml). The mixture is stirred for 30 minutes before methyl iodide (0.25 ml, 4.1 mmol) is added. The mixture is warmed to RT and stirred for 17 h. The mixture is diluted with DCM and extracted with a saturated aqueous sodium hydrogencarbonate solution. The combined organic layers are dried over MgSO4 and concentrated in vacuo. The product is purified by RP HPLC. Yield: 0.61 g (71%). HPLC-MS: tR=0.88 min (METHOD—1).
N8) 7-chloro-1,2-dimethyl-1H,2H,3H-pyrazolo[3,4-c]pyridin-3-one




Thionyl chloride (92 μl, 1.25 mmol) is added to a mixture of 2,3-dichloro-pyridine-4-carboxylic acid (200 mg, 1.04 mmol), DCM (2 ml) and DMF (20 μl). The mixture is heated to 100° C. for 10 minutes in a microwave. The mixture is concentrated in vacuo. DCM (2.5 ml) and 1,2-dimethylhydrazine dihydrochloride (207 mg, 1.55 mmol) is added before DIPEA (1.35 ml, 7.77 mmol) in DCM (2.5 ml) is added dropwise at RT. Stirring is continued for 1 hour. The mixture is diluted with DCM and extracted with water. The combined organic layers are dried over Na2SO4 and concentrated in vacuo. NMP (1 ml) and triethylamine (200 μl, 1.5 mmol) is added and the mixture heated to 190° C. for 25 minutes in a microwave. At RT water is added (500 μl) and the product purified by RP HPLC. Yield: 50 mg (24%). HPLC-MS: M+H=198; tR=0.44 min (METHOD—1).
N9a) Methyl 3-amino-4,5-dimethyl-1H-pyrrole-2-carboxylate




2-Amino-malonic acid dimethyl ester hydrochloride (8.51 g, 46.3 mmol) and sodium acetate (3.8 g, 46.3 mmol) is added to a mixture of 2-methyl-3-oxo-butyronitrile (3.0 g, 30.9 mmol), methanol (60 ml) and water (12 ml) and stirred at RT for 17 h. The mixture is concentrated in vacuo to 20 ml and extracted with EtOAc. The combined organic layers are dried over MgSO4 and concentrated in vacuo. Methanol (100 ml) and sodium methoxide (5.4 mol/l in MeOH, 6 ml, 32.4 mmol) is added and the mixture stirred at 65° C. for 3 hours. Water is added at RT and the mixture extracted with EtOAc. The combined organic layers are dried over MgSO4 and concentrated in vacuo. The product is purified by RP HPLC. Yield: 2.2 g (42%). HPLC-MS: M+H=169; tR=0.52 min (METHOD—1).
N9b) 2,5,6,7-Tetramethyl-3H,4H,5H-pyrrolo[3,2-d]pyrimidin-4-one




Acetyl chloride (1 mol/l in DCM, 13 ml, 13 mmol) is added to a mixture of methyl 3-amino-4,5-dimethyl-1H-pyrrole-2-carboxylate N9a (2.2 g, 12.1 mmol), DIPEA (4.5 ml, 26.5 mmol) and DCM (40 ml) at 0° C. under stirring. The mixture is warmed to RT and stirring continued for 1 hour. Saturated aqueous solution of NaHCO3 is added and the precipitate collected. The aqueous phase is extracted with DCM. The combined organic layers are dried over MgSO4, concentrated in vacuo and pooled with the precipitate. DCM (35 ml) and benzyltriethylammonium bromide (645 mg, 2.37 mmol) is added and the mixture cooled to 0° C. Sodium hydroxide (50% in water, 15 ml) and dimethylsulfate (1.4 g, 11.2 mmol) is added and stirring continued at 0° C. for 1 hour. Water is added and the mixture extracted with DCM. The combined organic layers are dried over MgSO4 and concentrated in vacuo. Concentrated aqueous ammonia (20 ml) is added and the mixture heated to 100° C. in a microwave for 30 hours. The mixture is concentrated in vacuo and the crude product (0.59 g) used without further purification. HPLC-MS: M+H=192; tR=0.62 min (METHOD—1).
N9c) 4-Chloro-2,5,6,7-tetramethyl-5H-pyrrolo[3,2-d]pyrimidine




A mixture of 2,5,6,7-tetramethyl-3H,4H,5H-pyrrolo[3,2-d]pyrimidin-4-one N9b (0.334 g, 1.75 mmol) and POCl3 (4 ml) is stirred at 100° C. for 17 hours. At 0° C. DCM (30 ml) and aqueous sodium hydroxide (1 mol/1, 20 ml) is added under vigorous stirring. The water phase is made basic with an aqueous solution of sodium hydroxide (1 mol/l) and extracted with DCM. The combined organic layers are dried over MgSO4 and concentrated in vacuo. The product is used without further purification. Yield: 330 mg (90%). HPLC-MS: M+H=210; tR=0.92 min (METHOD—1).
Biological Methods
XIAP BIR3 and cIAP1 BIR3 Binding Assays (DELFIA)
BIR3 domains of human XIAP (covering amino acids 241 to 356; XIAP BIR3) and cIAP1 (covering amino acids 256 to 363; cIAP1 BIR3) were expressed and purified from E. coli as GST-fusion proteins. Peptide AVPIAQKSE-Lys(Biotin), representing the N-terminus of mature human SMAC (SMAC peptide), was used as interaction partner in the protein-peptide interaction assay.
BIR3 domains (10 nM) were incubated with SMAC peptide (10 nM) in assay buffer (50 mM Tris, 120 mM NaCl, 0.1% BSA, 1 mM DTT, 0.05% TritonX100) for one hour at room temperature in the presence of inhibitory compounds. The assay mixture was transferred to a streptavidin coated plate and incubated for one hour at room temperature to allow binding of the biotinylated peptide and associated BIR3 domains to the plate. After several washing steps Eu labeled anti-GST antibody (e.g. Perkin Elmer DELFIA Eu-N1-antiGST AD0250) was added to detect BIR3 domain-SMAC peptide interactions m according to Perkin Elmer's instructions. Briefly, the antibody was added (dilution 1:5000 in Perkin Elmer DELFIA Assay Buffer 2013-01) and incubated for one hour. After 3 washing steps using Delfia Washing Buffer (Perkin Elmer DELFIA Wash 2013-05), Enhancement Solution (Perkin Elmer Enhancement Asolution 2013-02) was added and incubation continued for 10 minutes. Time resolved Europium fluoresecence was measured in a Wallac Victor using Standard assay settings.
IC50 values for inhibitory compounds were calculated from assay results obtained by incubating BIR3 domains with SMAC peptide in the presence of serially diluted compounds (e.g. 1:5). DELFIA assay results were plotted against compound concentrations and Software GraphPad Prizm was used to calculate half maximal inhibitory concentrations (IC50 values).
The IC50 values representing the biological activity of the examples are listed in the tables below. All IC50 values are reported in nM and represent the activity of the (S)-isomers:















#
XIAP BIR-3
cIAP1 BIR-3









 1
  23
  1



 2
 195
  2



 3
 373
  3



 4
 798
 28



 5
 315
  5



 6
  93
 10



 7
 280
  3



 8
 134 
  1



 9 
  28
  1



10
 217
  7



11
  10
  1



12
 188 
  3



13
 391 
  2



14
  24
  1



15
  22
  1



16
  15
  1



17
 340 
 95



18
  78
  1



19
 4967
 225



20
 2286
 50



21
  32
  1



22
 108
  1



23
 120 
  8



24
 145 
  1



25
 1090
 47



26
  15
  1



27
 2021
 18



28
 1025
 31



29
 748 
 28



30
 2099
 36



31
 1107
 52



32
 385
 53



33
 395 
 59



34
 2738
 104



35
 3637
 132



36
 4289
 170



37
 1801
 428



38
 1471
 514



39
 1418
 553



40
 2576
 598



41
 2769
 703



42
 5922
1187



43
 2156
2603



44
 5959
3189



45
 8717
4939



46
 9574
6334



47
 561
 17



48
  41
  1



49
 164
5346



50
 317 
 348



51
  15
  1



52
  40
  1



53
 115
  1



54
 231
 11



55
 5052
 45



56
15120
4597



57
 7329
 421



58
 116*
  3*



59
  10
  1



60
  1
 34



61
  32
  1



62
  50
  1



63
  1
 55







*racemic compound






On the basis of their biological properties the compounds of general formula (1) according to the invention, their tautomers, racemates, enantiomers, diastereomers, mixtures thereof and the salts of all the above-mentioned forms are suitable for treating diseases characterised by excessive or abnormal cell proliferation.
Such diseases include for example: viral infections (e.g. HIV and Kaposi's sarcoma); inflammatory and autoimmune diseases (e.g. colitis, arthritis, Alzheimer's disease, to glomerulonephritis and wound healing); bacterial, fungal and/or parasitic infections; leukaemias, lymphomas and solid tumours (e.g. carcinomas and sarcomas), skin diseases (e.g. psoriasis); diseases based on hyperplasia which are characterised by an increase in the number of cells (e.g. fibroblasts, hepatocytes, bones and bone marrow cells, cartilage or smooth muscle cells or epithelial cells (e.g. endometrial hyperplasia)); bone diseases and cardiovascular diseases (e.g. restenosis and hypertrophy).
For example, the following cancers may be treated with compounds according to the invention, without being restricted thereto: brain tumours such as for example acoustic neurinoma, astrocytomas such as pilocytic astrocytomas, fibrillary astrocytoma, protoplasmic astrocytoma, gemistocytary astrocytoma, anaplastic astrocytoma and glioblastoma, brain lymphomas, brain metastases, hypophyseal tumour such as prolactinoma, HGH (human growth hormone) producing tumour and ACTH producing tumour (adrenocorticotropic hormone), craniopharyngiomas, medulloblastomas, meningeomas and oligodendrogliomas; nerve tumours (neoplasms) such as for example tumours of the vegetative nervous system such as neuroblastoma sympathicum, ganglioneuroma, paraganglioma (pheochromocytoma, chromaffinoma) and glomus-caroticum tumour, tumours on the peripheral nervous system such as amputation neuroma, neurofibroma, neurinoma (neurilemmoma, Schwannoma) and malignant Schwannoma, as well as tumours of the central nervous system such as brain and bone marrow tumours; intestinal cancer such as for example carcinoma of the rectum, colon carcinoma, colorectal carcinoma, anal carcinoma, carcinoma of the large bowel, tumours of the small intestine and duodenum; eyelid tumours such as basalioma or basal cell carcinoma; pancreatic cancer or carcinoma of the pancreas; bladder cancer or carcinoma of the bladder; lung cancer (bronchial carcinoma) such as for example small-cell bronchial carcinomas (oat cell carcinomas) and non-small cell bronchial carcinomas (NSCLC) such as plate epithelial carcinomas, adenocarcinomas and large-cell bronchial carcinomas; breast cancer such as for example mammary carcinoma such as infiltrating ductal carcinoma, colloid carcinoma, lobular invasive carcinoma, tubular carcinoma, adenocystic carcinoma and papillary carcinoma; non-Hodgkin's lymphomas (NHL) such as for example Burkitt's lymphoma, low-malignancy non-Hodgkin's lymphomas (NHL) and mucosis fungoides; uterine cancer or endometrial carcinoma or corpus carcinoma; CUP syndrome (Cancer of Unknown Primary); ovarian cancer or ovarian carcinoma such as mucinous, endometrial or serous cancer; gall bladder cancer; bile duct cancer such as for example Klatskin tumour; testicular cancer such as for example seminomas and non-seminomas; lymphoma (lymphosarcoma) such as for example malignant lymphoma, Hodgkin's disease, non-Hodgkin's lymphomas (NHL) such as chronic lymphatic leukaemia, leukaemic reticuloendotheliosis, immunocytoma, plasmocytoma (multiple myeloma), immunoblastoma, Burkitt's lymphoma, T-zone mycosis fungoides, large-cell anaplastic lymphoblastoma and lymphoblastoma; laryngeal cancer such as for example tumours of the vocal cords, supraglottal, glottal and subglottal laryngeal tumours; bone cancer such as for example osteochondroma, chondroma, chondroblastoma, chondromyxoid fibroma, osteoma, osteoid osteoma, osteoblastoma, eosinophilic granuloma, giant cell tumour, chondrosarcoma, osteosarcoma, Ewing's sarcoma, reticulo-sarcoma, plasmocytoma, fibrous dysplasia, juvenile bone cysts and aneurysmatic bone cysts; head and neck tumours such as for example tumours of the lips, tongue, floor of the mouth, oral cavity, gums, palate, salivary glands, throat, nasal cavity, paranasal sinuses, larynx and middle ear; liver cancer such as for example liver cell carcinoma or hepatocellular carcinoma (HCC); leukaemias, such as for example acute leukaemias such as acute lymphatic/lymphoblastic leukaemia (ALL), acute myeloid leukaemia (AML); chronic leukaemias such as chronic lymphatic leukaemia (CLL), chronic myeloid leukaemia (CML); stomach cancer or gastric carcinoma such as for example papillary, tubular and mucinous adenocarcinoma, signet ring cell carcinoma, adenosquamous carcinoma, small-cell carcinoma and undifferentiated carcinoma; melanomas such as for example superficially spreading, nodular, lentigo-maligna and acral-lentiginous melanoma; renal cancer such as for example kidney cell carcinoma or hypernephroma or Grawitz's tumour; oesophageal cancer or carcinoma of the oesophagus; penile cancer; prostate cancer; throat cancer or carcinomas of the pharynx such as for example nasopharynx carcinomas, oropharynx carcinomas and hypopharynx carcinomas; retinoblastoma such as for example vaginal cancer or vaginal carcinoma; plate epithelial carcinomas, adenocarcinomas, in situ carcinomas, malignant melanomas and sarcomas; thyroid carcinomas such as for example papillary, follicular and medullary thyroid carcinoma, as well as anaplastic carcinomas; spinalioma, epidormoid carcinoma and plate epithelial carcinoma of the skin; thymomas, cancer of the urethra and cancer of the vulva.
Preferred cancers, which may be treated with compounds according to the invention, are lung, liver, colon, brain, breast, ovary, prostate cancer, pancreas, kidney, stomach, head, neck and urothelial cancer, as well as, lymphoma and leukemia.
The new compounds may be used for the prevention, short-term or long-term treatment of the above-mentioned diseases, optionally also in combination with radiotherapy or other “state-of-the-art” compounds, such as e.g. cytostatic or cytotoxic substances, cell proliferation inhibitors, anti-angiogenic substances, steroids or antibodies.
The compounds of general formula (1) may be used on their own or in combination with other active substances according to the invention, optionally also in combination with other pharmacologically active substances.
Chemotherapeutic agents which may be administered in combination with the compounds according to the invention, include, without being restricted thereto, hormones, hormone analogues and antihormones (e.g. tamoxifen, toremifene, raloxifene, fulvestrant, megestrol acetate, flutamide, nilutamide, bicalutamide, aminoglutethimide, cyproterone acetate, finasteride, buserelin acetate, fludrocortisone, fluoxymesterone, medroxyprogesterone, octreotide), aromatase inhibitors (e.g. anastrozole, letrozole, liarozole, vorozole, exemestane, atamestane), LHRH agonists and antagonists (e.g. goserelin acetate, luprolide), inhibitors of growth factors (growth factors such as for example “platelet derived growth factor” and “hepatocyte growth factor”, inhibitors are for example “growth to factor” antibodies, “growth factor receptor” antibodies and tyrosine kinase inhibitors, such as for example cetuximab, gefitinib, imatinib, lapatinib and trastuzumab); antimetabolites (e.g. antifolates such as methotrexate, raltitrexed, pyrimidine analogues such as 5-fluorouracil, capecitabin and gemcitabin, purine and adenosine analogues such as mercaptopurine, thioguanine, cladribine and pentostatin, cytarabine, fludarabine); antitumour antibiotics (e.g. anthracyclins such as doxorubicin, daunorubicin, epirubicin and idarubicin, mitomycin-C, bleomycin, dactinomycin, plicamycin, streptozocin); platinum derivatives (e.g. cisplatin, oxaliplatin, carboplatin); alkylation agents (e.g. estramustin, meclorethamine, melphalan, chlorambucil, busulphan, dacarbazin, cyclophosphamide, ifosfamide, temozolomide, nitrosoureas such as for example carmustin and lomustin, thiotepa); antimitotic agents (e.g. Vinca alkaloids such as for example vinblastine, vindesin, vinorelbin and vincristine; and taxanes such as paclitaxel, docetaxel); topoisomerase inhibitors (e.g. epipodophyllotoxins such as for example etoposide and etopophos, teniposide, amsacrin, topotecan, irinotecan, mitoxantron) and various chemotherapeutic agents such as amifostin, anagrelid, clodronat, filgrastin, interferon alpha, leucovorin, rituximab, procarbazine, levamisole, mesna, mitotane, pamidronate and porfimer.
Other possible combination partners are 2-chlorodesoxyadenosine, 2-fluorodesoxycytidine, 2-methoxyoestradiol, 2C4, 3-alethine, 131-I-TM-601, 3CPA, 7-ethyl-10-hydroxycamptothecin, 16-aza-epothilone B, A 105972, A 204197, aldesleukin, alitretinoin, altretamine, alvocidib, amonafide, anthrapyrazole, AG-2037, AP-5280, apaziquone, apomine, aranose, arglabin, arzoxifene, atamestane, atrasentan, auristatin PE, AVLB, AZ10992, ABX-EGF, ARRY-300, ARRY-142886/AZD-6244, ARRY-704/AZD-8330, AS-703026, azacytidine, azaepothilone B, azonafide, BAY-43-9006, BBR-3464, BBR-3576, bevacizumab, biricodar dicitrate, BCX-1777, bleocin, BLP-25, BMS-184476, BMS-247550, BMS-188797, BMS-275291, BNP-1350, BNP-7787, BIBW 2992, BIBF 1120, bleomycinic acid, bleomycin A, bleomycin B, bryostatin-1, bortezomib, brostallicin, busulphan, CA-4 prodrug, CA-4, CapCell, calcitriol, canertinib, canfosfamide, capecitabine, carboxyphthalatoplatin, CCI-779, CEP-701, CEP-751, CBT-1 cefixime, ceflatonin, ceftriaxone, celecoxib, celmoleukin, cemadotin, CH4987655/RO-4987655, chlorotrianisene, cilengitide, ciclosporin, CDA-II, CDC-394, CKD-602, clofarabin, colchicin, combretastatin A4, CHS-828, CLL-Thera, CMT-3 cryptophycin 52, CTP-37, CP-461, CV-247, cyanomorpholinodoxorubicin, cytarabine, D 24851, decitabine, deoxorubicin, deoxyrubicin, deoxycoformycin, depsipeptide, desoxyepothilone B, dexamethasone, dexrazoxanet, diethylstilbestrol, diflomotecan, didox, DMDC, dolastatin 10, doranidazole, E7010, γ-6201, edatrexat, edotreotide, efaproxiral, eflornithine, EKB-569, EKB-509, elsamitrucin, epothilone B, epratuzumab, ER-86526, erlotinib, ET-18-OCH3, ethynylcytidine, ethynyloestradiol, exatecan, exatecan mesylate, exemestane, exisulind, fenretinide, floxuridine, folic acid, FOLFOX, FOLFIRI, formestane, galarubicin, gallium maltolate, gefinitib, gemtuzumab, gimatecan, glufosfamide, GCS-IOO, G17DT immunogen, GMK, GPX-100, GSK-5126766, GSK-1120212, GW2016, granisetron, hexamethylmelamine, histamine, homoharringtonine, hyaluronic acid, hydroxyurea, hydroxyprogesterone caproate, ibandronate, ibritumomab, idatrexate, idenestrol, IDN-5109, IMC-1C11, immunol, indisulam, interferon alpha-2a, interferon alfa-2b, interleukin-2, ionafarnib, iproplatin, irofulven, isohomohalichondrin-B, isoflavone, isotretinoin, ixabepilone, JRX-2, JSF-154, J-107088, conjugated oestrogens, kahalid F, ketoconazole, KW-2170, lobaplatin, leflunomide, lenograstim, leuprolide, leuporelin, lexidronam, LGD-1550, linezolid, lutetium texaphyrin, lometrexol, losoxantrone, LU 223651, lurtotecan, mafosfamide, marimastat, mechloroethamine, methyltestosteron, methylprednisolone, MEN-10755, MDX-H210, MDX-447, MGV, midostaurin, minodronic acid, mitomycin, mivobulin, MK-2206, MLN518, motexafin gadolinium, MS-209, MS-275, MX6, neridronate, neovastat, nimesulide, nitroglycerin, nolatrexed, norelin, N-acetylcysteine, 06-benzylguanine, omeprazole, oncophage, ormiplatin, ortataxel, oxantrazole, oestrogen, patupilone, pegfilgrastim, PCK-3145, pegfilgrastim, PBI-1402, PEG-paclitaxel, PEP-005, P-04, PKC412, P54, PI-88, pelitinib, pemetrexed, pentrix, perifosine, perillylalcohol, PG-TXL, PG2, PLX-4032/RO-5185426, PT-100, picoplatin, pivaloyloxymethylbutyrate, pixantrone, phenoxodiol O, PKI166, plevitrexed, plicamycin, polyprenic acid, porfiromycin, prednisone, prednisolone, quinamed, quinupristin, RAF-265, ramosetron, ranpirnase, RDEA-119/BAY 869766, rebeccamycin analogues, revimid, RG-7167, rhizoxin, rhu-MAb, risedronate, rituximab, rofecoxib, Ro-31-7453, RO-5126766, to RPR 109881A, rubidazon, rubitecan, R-flurbiprofen, S-9788, sabarubicin, SAHA, sargramostim, satraplatin, SB 408075, SU5416, SU6668, SDX-101, semustin, seocalcitol, SM-11355, SN-38, SN-4071, SR-27897, SR-31747, SRL-172, sorafenib, spiroplatin, squalamine, suberanilohydroxamic acid, sutent, T 900607, T 138067, TAS-103, tacedinaline, talaporfin, tariquitar, taxotere, taxoprexin, tazarotene, tegafur, temozolamide, tesmilifene, testosterone, testosterone propionate, tesmilifene, tetraplatin, tetrodotoxin, tezacitabine, thalidomide, theralux, therarubicin, thymectacin, tiazofurin, tipifarnib, tirapazamine, tocladesine, tomudex, toremofin, trabectedin, TransMID-107, transretinic acid, traszutumab, tretinoin, triacetyluridine, triapine, trimetrexate, TLK-286TXD 258, urocidin, valrubicin, vatalanib, vincristine, vinflunine, virulizin, WX-UK1, vectibix, xeloda, XELOX, XL-281, XL-518/R-7420, YM-511, YM-598, ZD-4190, ZD-6474, ZD-4054, ZD-0473, ZD-6126, ZD-9331, ZDI839, zoledronat and zosuquidar.
Suitable preparations include for example tablets, capsules, suppositories, solutions—particularly solutions for injection (s.c., i.v., i.m.) and infusion—elixirs, emulsions or dispersible powders. The content of the pharmaceutically active compound(s) should be in the range from 0.1 to 90 wt.-%, preferably 0.5 to 50 wt.-% of the composition as a whole, i.e. in amounts which are sufficient to achieve the dosage range specified below. The doses specified may, if necessary, be given several times a day.
Suitable tablets may be obtained, for example, by mixing the active substance(s) with known excipients, for example inert diluents such as calcium carbonate, calcium phosphate or lactose, disintegrants such as corn starch or alginic acid, binders such as starch or gelatine, lubricants such as magnesium stearate or talc and/or agents for delaying release, such as carboxymethyl cellulose, cellulose acetate phthalate, or polyvinyl acetate. The tablets may also comprise several layers.
Coated tablets may be prepared accordingly by coating cores produced analogously to the tablets with substances normally used for tablet coatings, for example collidone or shellac, gum arabic, talc, titanium dioxide or sugar. To achieve delayed release or prevent incompatibilities the core may also consist of a number of layers. Similarly the tablet coating may consist of a number of layers to achieve delayed release, possibly using the to excipients mentioned above for the tablets.
Syrups or elixirs containing the active substances or combinations thereof according to the invention may additionally contain a sweetener such as saccharine, cyclamate, glycerol or sugar and a flavour enhancer, e.g. a flavouring such as vanillin or orange extract. They may also contain suspension adjuvants or thickeners such as sodium carboxymethyl cellulose, wetting agents such as, for example, condensation products of fatty alcohols with ethylene oxide, or preservatives such as p-hydroxybenzoates.
Solutions for injection and infusion are prepared in the usual way, e.g. with the addition of isotonic agents, preservatives such as p-hydroxybenzoates, or stabilisers such as alkali metal salts of ethylenediamine tetraacetic acid, optionally using emulsifiers and/or dispersants, whilst if water is used as the diluent, for example, organic solvents may optionally be used as solvating agents or dissolving aids, and transferred into injection vials or ampoules or infusion bottles.
Capsules containing one or more active substances or combinations of active substances may for example be prepared by mixing the active substances with inert carriers such as lactose or sorbitol and packing them into gelatine capsules.
Suitable suppositories may be made for example by mixing with carriers provided for this purpose, such as neutral fats or polyethyleneglycol or the derivatives thereof.
Excipients which may be used include, for example, water, pharmaceutically acceptable organic solvents such as paraffins (e.g. petroleum fractions), vegetable oils (e.g. groundnut or sesame oil), mono- or polyfunctional alcohols (e.g. ethanol or glycerol), carriers such as e.g. natural mineral powders (e.g. kaolins, clays, talc, chalk), synthetic mineral powders (e.g. highly dispersed silicic acid and silicates), sugars (e.g. cane sugar, lactose and glucose) emulsifiers (e.g. lignin, spent sulphite liquors, methylcellulose, starch and polyvinylpyrrolidone) and lubricants (e.g. magnesium stearate, talc, stearic acid and sodium lauryl sulphate).
The preparations are administered by the usual methods, preferably by oral or transdermal route, most preferably by oral route. For oral administration the tablets may, of course contain, apart from the abovementioned carriers, additives such as sodium citrate, calcium carbonate and dicalcium phosphate together with various additives such as starch, preferably potato starch, gelatine and the like. Moreover, lubricants such as magnesium stearate, sodium lauryl sulphate and talc may be used at the same time for the tabletting process. In the case of aqueous suspensions the active substances may be combined with various flavour enhancers or colourings in addition to the excipients mentioned above.
For parenteral use, solutions of the active substances with suitable liquid carriers may be used.
However, it may sometimes be necessary to depart from the amounts specified, depending on the body weight, the route of administration, the individual response to the drug, the nature of its formulation and the time or interval over which the drug is administered. Thus, in some cases it may be sufficient to use less than the minimum dose given above, whereas in other cases the upper limit may have to be exceeded. When administering large amounts it may be advisable to divide them up into a number of smaller doses spread over the day.
The formulation examples which follow illustrate the present invention without restricting its scope:
Examples of Pharmaceutical Formulations












A)
Tablets
per tablet








active substance according to formula (I)
100 mg



lactose
140 mg



corn starch
240 mg



polyvinylpyrrolidone
 15 mg



magnesium stearate
 5 mg




500 mg









The finely ground active substance, lactose and some of the corn starch are mixed together. The mixture is screened, then moistened with a solution of polyvinylpyrrolidone in water, kneaded, wet-granulated and dried. The granules, the remaining corn starch and the magnesium stearate are screened and mixed together. The mixture is compressed to produce tablets of suitable shape and size.












B)
Tablets
per tablet








active substance according to formula (I)
 80 mg



lactose
 55 mg



corn starch
190 mg



microcrystalline cellulose
 35 mg



polyvinylpyrrolidone
 15 mg



sodium-carboxymethyl starch
 23 mg



magnesium stearate
 2 mg




400 mg









The finely ground active substance, some of the corn starch, lactose, microcrystalline cellulose and polyvinylpyrrolidone are mixed together, the mixture is screened and worked with the remaining corn starch and water to form a granulate which is dried and screened. The sodiumcarboxymethyl starch and the magnesium stearate are added and mixed in and the mixture is compressed to form tablets of a suitable size.














C)
Ampoule solution





















active substance according to formula (I)
50 mg




sodium chloride
50 mg




water for inj.
 5 mL










The active substance is dissolved in water at its own pH or optionally at pH 5.5 to 6.5 and sodium chloride is added to make it isotonic. The solution obtained is filtered free from pyrogens and the filtrate is transferred under aseptic conditions into ampoules which are then sterilised and sealed by fusion. The ampoules contain 5 mg, 25 mg and 50 mg of active substance.

## Claims

1. A compound of the formula (I)



wherein,
R1 is —CH3, —CH2CH3, —C1-3haloalkyl or —H;
R2 is —H or —C1-3alkyl;
R2a is —H or —C1-3alkyl;
R3 is benzyl, phenyl or 5-12 membered heteroaryl, each of which groups is optionally substituted with one or more independently selected R5 groups, or
R3 is 8-12 membered aromatic heterocyclyl, which is optionally substituted with one or more moieties independently selected from the group consisting of ═O and R5;
R4 is —H, halogen, phenyl, naphthyl or 5-12 membered heteroaryl, each of which groups is optionally substituted with one or more independently selected R6 groups, or
R4 is 8-12 membered aromatic heterocyclyl, which heterocyclyl is optionally substituted with one or more moieties independently selected from the group consisting of ═O and R6;
R5 is halogen, —CN, —C1-3alkyl or —O—C1-5alkyl; and
R6 is halogen, —CN, —NH2, —C1-3alkyl, —C1-3haloalkyl or —O—C1-3alkyl;
or a pharmaceutically acceptable salt thereof.

2. A compound according to claim 1, wherein R1 is —CH3 or —CH2CH3.

3. A compound according to claim 1, wherein R2 is —CH3 or —CH2CH3.

4. A compound according to claim 1, wherein R2a is —H.

5. A compound according claim 1, wherein R3 is 5-12 membered heteroaryl, optionally substituted with one or more independently selected R5 groups.

6. A compound according to claim 1, wherein R3 is pyridyl, pyrimidinyl,




each of which groups is optionally substituted as defined in claim 1.

7. A compound according to claim 6, wherein R3 is pyridyl or




each of which group is optionally substituted as defined in claim 1.

8. A compound according to claim 1, wherein R4 is 5-12 membered heteroaryl, optionally substituted with one or more independently selected R6 groups.

9. A compound according to claim 1, wherein R4 is —Cl, pyridyl, pyrimidinyl,




each of which group is optionally substituted with one or more substituents as defined in claim 1.

10. A compound according to claim 1, wherein R4 is pyridyl,




each of which groups is optionally substituted as defined in claim 1.

11. A compound according to claim 1, wherein R4 is




each of which groups is optionally and independently substituted as defined in claim 1.

12. A compound according to claim 1, wherein R5 —CN, —F, —Cl, —CH3 or —O—CH3.

13. A compound according to claim 1, wherein R4 is substituted with one or more substituents selected from ═O and R6, wherein R6 is —CN, —F, —Cl, —NH2, —CH3 or —O—CH3.

14. A compound according to claim 1 selected from the group consisting of











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or a pharmaceutically acceptable salt thereof.

15. A pharmaceutical composition comprising a compound according to claim 1 and a pharmaceutically acceptable carrier.