PYRAZOLONAPHTHYRIDINONE DERIVATIVES AS METAP2

INHIBITORS (METHIONINE AMINOPEPTIDASE TYPE-2)

The present invention relates to pyrazolonaphthyridinone derivatives, to their preparation and to their therapeutic use.

The compounds according to the present invention are reversible and selective inhibitors of type-2 methionine aminopeptidase (MetAP2).

MetAP2 is an ubiquitous cytosol-based metalloprotease involved in polypeptide catabolism.

MetAP2 catalyses the cleavage of methionine residues located at the AMerminal end of proteins newly synthesized by the cell (Bradshaw R.A. et a/., TIBS, 1998, 23, 263-267). Cleavage of the AMerminal methionine residues is an important step in the maturation of many proteins and polypeptides. It enables the cell to continue the usual post-translational modifications (myristoylation, palmitoylation, etc.), and then to degrade these same proteins. However, MetAP2 can only cleave this residue on condition that the second residue is of smaller size and uncharged.

MetAP2 is active when the active site contains two divalent metal atoms such as Co(ll) or Mn(ll) (Li X., Chang Y.H., Biochem. Biophys. Res. Commun. 227, 1996, 152-159). Studies have moreover made it possible to establish that human MetAP2 quite probably uses manganese as physiological metal ion (Wang J. et a/., Biochemistry 2003, 42, 5035-5042).

Another function of MetAP2 is to prevent the protein translation factor elF2 (eukaryotic initiation factor 2) from phosphorylation(Datta et a/., 1988; Li and Chang, 1996) . It has been shown that the phosphorylation of elF2 results in inhibition of overall protein synthesis in eukaryotic cells. By binding to the protein translation factor (elF2) MetAP2 protects the alpha subunit from inhibitory phosphorylation (Datta, 2000; Kimball, 1999; Pestova et a/., 2001 ). However, inhibitors of MetAP2 activity do not affect the capacity of MetAP2 to block the phosphorylation of elF2 (Griffith, 1997), which suggests that the two functions are independent.

A MetAP2 isoform exists: MetAPI . These two isoforms are distinguished by the presence of an additional helical domain of about 60 residues within the C-terminal domain of MetAP2. Eukaryotes possess the two forms. A mutation of the two forms is lethal to the eukaryotic cell. This result underlines the interest in identifying inhibitors that are selective towards MetAP2. On the other hand, when only one isoform is mutated, growth reduction is observed (Li X. and Chang Y.H., Proc. Natl. Acad. Sci. 1995, 92, 12357-12361 ). These results confirm that methionine aminopeptidase (MAP) function is essential for cell growth and this activity cannot be relayed by a route independent of MetAPs.

Two types of MetAP2 inhibitor also exist: reversible inhibitors and irreversible inhibitors. Certain known irreversible inhibitors are fumagillin, TNP-470 and ovalicin. At the molecular level, TNP-470, just like fumagillin and ovalicin, binds covalently and irreversibly to MetAP2 (Griffith E.C. et al., Chem. Biol. 1997, 4, 461-471 ).

MetAP2 has been identified as being the target of a family of anti-angiogenic agents derived from fumagillin, described as powerful irreversible MetAP2 inhibitors. The causal link between the inhibition of MetAP2 and the resulting inhibition of endothelial cell proliferation and of neovascularization is clearly established (Griffith E.C. et al, Chem. Biol. 1998, 95, 15183-15188).

At the cellular level, the target proteins of MetAP2 are still at the present time very scarcely known. One of them is glyceraldehyde-3-phosphate dehydrogenase. A defect in the synthesis of this enzyme has been observed during treatment of endothelial cells with TNP^70. Recent studies support the hypothesis that the anti-MetAP2 activity of TNP-470 is the source of its anti-angiogenic activity.

It has been shown that irreversible MetAP2 inhibitors play a role in the treatment of pulmonary and hepatic fibroses. Fibrosis is the abnormal formation of scar tissues following a tissue lesion and leads to chronic and progressive impairment of the affected organs, which may result in serious dysfunction of the affected organ. Many causes of fibrosis may exist, but in the majority of cases the cause of the affliction remains unknown and the lesions are difficult to detect. Aggregates of activated fibroblasts and myofibroblasts develop, which constitute the start of numerous fibrotic foci. When the

lesions are formed, they are irreversible and cannot be eliminated. Treatments are thus directed towards slowing down the evolution of the complaint and of improving the symptoms. In this context, irreversible MetAP2 inhibitors have shown on in vivo models a reduction of pulmonary and hepatic fibrosis. However, substantial toxicity of these irreversible inhibitors has been demonstrated (Kruger E.A., Exp. Opinion Invest. Drugs, 2000; Satchi-Fainaro R. et al., Nature Medicine, 2004).

The present invention provides compounds of the formula (I)

in which:

X represents CH or a nitrogen atom,

Y represents CH or a nitrogen atom, where X or Y is a nitrogen atom,

Ri represents a (C1 -C4)alkyl non substituted or substituted with one or more halogen atoms,

R2 represents an aryl or a heteroaryl group, non substituted or substituted with one or more substituents independently selected from:

a halogen atom,

- a (C1-C4)alky group, where the alkyl group is non substituted or substituted with one or more substituents independently selected from a halogen atom, a heterocyclyl, (C1-C4)alkoxy or hydroxy group or NHR3

- 0-R4

- (CO)NR5R5'

- a heterocyclyl group, non substituted or substituted with one or more (C1- C4)alkyl group

- a cycloalkyl group

- a cyano group

- NR6R6.

- S02NR6R6.

- NH(CO)R7

- (CO)R8 and

- a heteroaryl group,

R3 represents a (C1-C4)alkyl or a cycloalkyl group,

R4 represents a hydrogen atom or a (C1-C4)alkyl group, where the alkyl group is non substituted or substituted with one or more halogen atom or heterocyclyl group,

R5 and R5- represent independently a hydrogen atom, a (C1-C4)alkyl or aryl group, R6 and R6' represent independently a hydrogen atom or a (C1-C4)alkyl group,

R7 represents a (C1-C4)alkyl group, and

R8 represents a (C1-C4)alkyl, (C1-C4)alkoxy, cycloalkyl or hydroxy group.

The compounds of formula (I) may comprise one or more asymmetric carbon atoms. They may thus exist in the form of enantiomers or diastereoisomers. These enantiomers and diastereoisomers, and also mixtures thereof, including racemic mixtures, form part of the invention.

The compounds of formula (I) may be present as well under tautomer forms and are part of the invention.

The compounds of formula (I) may exist in the form of bases or addition salts with acids or bases, in particular pharmaceutically acceptable salts. Such addition salts form part of the invention.

These salts are advantageously prepared with pharmaceutically acceptable acids, such as hydrochloric acid, but the salts of other acids that are useful, for example, for purifying or isolating the compounds of formula (I) also form part of the invention.

In the context of the present invention, certain terms have the following definitions:

- a halogen atom: a fluorine, a chlorine, a bromine or an iodine atom;

- an alkyl group: a linear or branched saturated aliphatic group. Examples include the groups methyl, ethyl, propyl, isopropyl, etc;

- a cycloalkyl group: a cyclic (C3-C6)alkyl group. Examples include the groups cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, etc.;

- an alkoxy group: a radical -O-alkyl in which the alkyl group is as defined above. Examples of alkoxy group include methoxy, ethoxy, isopropoxy, etc. ;

- a cyano group: a group CN;

- a hydroxy group: a group OH;

- an aryl group: a cyclic aromatic group comprising between 5 and 10 carbon atoms. Examples of an aryl group include phenyl group;

- a heteroaryl group: a mono or bicyclic aromatic group comprising between 5 and 10 carbon atoms and comprising between 1 and 5 heteroatoms, such as nitrogen or oxygen. Examples of heteroaryl groups include pyridine, 2-pyridyl, 4-pyridyl, 3-pyridyl, pyrazole, pyrimidine and quinoline groups;

- a heterocyclyl: a non substituted or bridged cyclic alkyl group comprising from 4 to 9 atoms forming this ring, 1 or 2 of which are heteroatoms, such as oxygen or nitrogen. Examples of heterocyclyl groups include pyrrolidine, piperazine, piperidine, morpholine and diazepane groups.

Among the compounds of formula (I) that are subject matter of the invention, a first group of compounds is composed of the compounds for which X represents a nitrogen atom and Y represents CH.

Among the compounds of formula (I) that are subject matter of the invention, a second group of compounds is composed of the compounds for which X represents CH and Y represents a nitrogen atom.

Among the compounds that are subjects of the invention, a third group of compounds is composed of the compounds of formula (I) in which R1 represents a (C1-C4)alkyl group non substituted or substituted with one or more fluorine atoms, more particularly a trifluoroethyl group.

Among the compounds of formula (I) that are subjects of the invention, a fourth group of compounds is composed of the compounds for which R2 represents an aryl group non substituted or substituted with one or more substituents independently selected from:

a halogen atom

- a (Ci-C4)alkyl group, where the alkyl group is non substituted or substituted with one or more substituents independently selected from a halogen atom, a heterocyclyl, (Ci-C4)alkoxy or hydroxy group or NHR3

" a hydroxy group

- O-R ,

- (CO)NHR5,

a heterocyclyl group, non substituted or substituted with a (Ci -C4)alkyl group

- NR6R6.,

- S02NR6 R6>

- NHS02R7,

- NH(CO)R7,

- (CO)R8 and

- a heteroaryl group.

Among the compounds of the fourth group, mention may be made of the compounds of formula (I) for which R2 represents a phenyl group.

Among the compounds of formula (I) that are subjects of the invention, a fifth group of compounds is composed of the compounds for which R2 represents a heteroaryl group non substituted or substituted with one or more substiutents independently selected from:

a halogen atom

- a (Ci-C4)alkyl group, where the alkyl group is non substituted or substituted with one or more substituents independently selected from a halogen atom, a heterocyclyl, (Ci-C4)alkoxy or hydroxy group or NHR3,

- O-R 4

- a heterocyclyl group, non substituted or substituted with a (Ci -C4)alkyl group

- a cycloalkyl group

- a cyano group

- NR6R6. and

- (COR.

Among the compounds of the fifth group, mention may be made of the compounds of formula (I) for which R2 represents a heteroaryl group comprising 1 or 2 nitrogen atoms.

Among the compounds of the latter group, mention may be made of the compounds of formula (I) for which R2 represents a pyridine, a pyrimidine or a quinoline group.

Among the compounds of formula (I) that are subjects matter of the invention, mention may be made in particular of the following compounds:

compound no 1 : 7-(2-Chloro-pyridin-3-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

compound no 2: 7-Pyridin-2-yl-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

compound no 3: 7-[2-(4-Methyl-piperazin-1 -yl)-pyridin-4-yl]-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

compound no 4: 7-(4-Fluoro-phenyl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

compound no 5: 7-o-Tolyl-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

compound no 6: 5-(2,2,2-Trifluoro-ethyl)-7-(2-trifluoromethyl-phenyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

compound no 7: 7-(2-Fluoro-phenyl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

compound no 8: 7-Pyridin-4-yl-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

compound no 9: 7-Quinolin-8-yl-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

compound no 10: 5-(2,2,2-Trifluoro-ethyl)-7-(2-trifluoromethoxy-phenyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

compound no 1 1 : 2-[4-Oxo-5-(2,2,2-trifluoro-ethyl)-4,5-dihydro-1 H-pyrazolo[4,3-c][1 ,6]naphthyridin-7-yl]-benzamide

compound no 12: 7-(4-Morpholin-4-yl-phenyl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

compound no 13: 7-(6-Amino-pyridin-3-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

compound no 14: 7-(2-Fluoro-4-methoxy-phenyl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

compound no 15: 4-[4-Oxo-5-(2,2,2-trifluoro-ethyl)-4,5-dihydro-1 H-pyrazolo[4,3-c][1 ,6]naphthyridin-7-yl]-N-phenyl-benzamide

compound no 16: 2-Fluoro-A/-methyl-5-[4-oxo-5-(2,2,2-trifluoro-ethyl)-4,5-dihydro-1 H-pyrazolo[4,3-c][1 ,6]naphthyridin-7-yl]-benzamide

compound no 17: 7-(2-Morpholin-4-ylmethyl-phenyl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

compound no 18: 7-(2-Ethoxymethyl-phenyl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

compound no 19: A/-Methyl-2-[4-oxo-5-(2,2,2-trifluoro-ethyl)-4,5-dihydro-1 H-pyrazolo[4,3-c][1 ,6]naphthyridin-7-yl]-benzenesulfonamide

compound no 20: 7-(3-Chloro-2-hydroxy-phenyl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

compound no 21 : 7-[2-(2-Pyrrolidin-1-yl-ethoxy)-phenyl]-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

compound no 22: A/-{2-[4-Oxo-5-(2,2,2-trifluoro-ethyl)-4,5-dihydro-1 H-pyrazolo[4,3-c][1 ,6]naphthyridin-7-yl]-phenyl}-methanesulfonamide

compound no 23: 7-(3-Pyrazol-1-yl-phenyl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

compound no 24: 7-(6-Chloro-2-methyl-pyridin-3-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

compound no 25: A/-lsopropyl-4-[4-oxo-5-(2,2,2-trifluoro-ethyl)-4,5-dihydro-1 H-pyrazolo[4,3-c][1 ,6]naphthyridin-7-yl]-benzenesulfonamide

compound no 26: 7-(2-lsopropoxy-pyridin-4-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

compound no 27: 7-(5-Methoxy-pyridin-3-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

compound no 28: 7-(2-Ethoxy-pyridin-3-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

compound no 29: A/,A/-Dimethyl-2-[4-oxo-5-(2,2,2-trifluoro-ethyl)-4,5-dihydro-1 H-pyrazolo[4,3-c][1 ,6]naphthyridin-7-yl]-benzenesulfonamide

compound no 30: A/-Ethyl-4-[4-oxo-5-(2,2,2-trifluoro-ethyl)-4,5-dihydro-1 H-pyrazolo[4,3-c][1 ,6]naphthyridin-7-yl]-benzenesulfonamide

compound no 31 : 7-[6-(4-Methyl-piperazin-1-yl)-pyridin-3-yl]-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

compound no 32: 7-(2-Morpholin-4-yl-phenyl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

compound no 33: 7-(2-Pyrrolidin-1-yl-pyridin-3-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

compound no 34: 7-(2-[1 ,4]Diazepan-1-yl-pyridin-3-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

compound no 35: 7-[2-(Ethyl-methyl-amino)-pyridin-3-yl]-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

compound no 36: 7-(2-Fluoro-pyridin-3-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

compound no 37: 7-(2-Chloro-pyridin-3-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

compound no 38: 7-Pyridin-2-yl-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

compound no 39: 7-Pyridin-4-yl-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

compound no 40: 7-[2-(4-Methyl-piperazin-1-yl)-pyridin-4-yl]-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

compound no 41 : 3-[4-Oxo-5-(2,2,2-trifluoro-ethyl)-4,5-dihydro-1 H-pyrazolo[4,3-c][1 ,5]naphthyridin-7-yl]-pyridine-2-carboxylic acid methyl ester

compound no 42: 7-(6-Amino-pyridin-2-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

compound no 43: 7-(2-Dimethylamino-phenyl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

compound no 44: 5-(2,2,2-Trifluoro-ethyl)-7-(3-trifluoromethyl-pyridin-2-yl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

compound no 45: 5-(2,2,2-Trifluoro-ethyl)-7-(5-trifluoromethyl-pyridin-2-yl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

compound no 46: 3-[4-Oxo-5-(2,2,2-trifluoro-ethyl)-4,5-dihydro-1 H-pyrazolo[4,3-c][1 ,5]naphthyridin-7-yl]-pyridine-2-carbonitrile

compound no 47: 7-(2-Cyclopropylaminomethyl-phenyl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

compound no 48: 7-(4-Cyclopentyl-pyrimidin-5-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

compound no 49: 7-(5-Chloro-2-methoxy-pyridin-3-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

compound no 50: 7-(3-Methylaminomethyl-pyridin-2-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

compound no 51 : 7-(4-lsopropyl-pyrimidin-5-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

compound no 52: 7-(5-Chloro-pyridin-2-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

compound no 53: 7-(3-Chloro-pyridin-2-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

compound no 54: 7-(2-Amino-6-methyl-pyrimidin-4-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

compound no 55: 7-(2-Amino-phenyl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

compound no 56: 5-(2,2,2-Trifluoro-ethyl)-7-(4-trifluoromethyl-phenyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

compound no 57: 7-[2-(2-Hydroxy-ethyl)-phenyl]-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

compound no 58: 2-[4-Oxo-5-(2,2,2-trifluoro-ethyl)-4,5-dihydro-1 H-pyrazolo[4,3-c][1 ,5]naphthyridin-7-yl]-nicotinonitrile

compound no 59: 7-(6-Methyl-pyrimidin-4-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

compound no 60: 5-(2,2,2-Trifluoro-ethyl)-7-(6-trifluoromethyl-pyridin-3-yl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

compound no 61 : 7-(3-Amino-pyridin-4-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

compound no 62: A/-{2-[4-Oxo-5-(2,2,2-trifluoro-ethyl)-4,5-dihydro-1 H-pyrazolo[4,3-c][1 ,5]naphthyridin-7-yl]-phenyl}-butyramide

compound no 63: 7-(4-Cyclohexyl-pyrimidin-5-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

compound no 64: A/-{2-[4-Oxo-5-(2,2,2-trifluoro-ethyl)-4,5-dihydro-1 H-pyrazolo[4,3-c][1 ,5]naphthyridin-7-yl]-phenyl}-isobutyramide

compound no 65: 7-(2-Acetyl-phenyl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

compound no 66: 7-[4-(cyclopropylcarbonyl)phenyl]-5-(2,2,2-trifluoroethyl)-1 ,5-dihydro-4H-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

compound no 67: 7-Pyridin-3-yl-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

compound no 68: 3-[4-Oxo-5-(2,2,2-trifluoro-ethyl)-4,5-dihydro-1 H-pyrazolo[4,3-c][1 ,5]naphthyridin-7-yl]-pyridine-2-carboxylic acid

in the form of a base, enantiomers, diastereoisomers, tautomers including racemic mixture, and addition salt with an acid.

In the text below, a protective group PG is a group which makes it possible on one hand to protect a reactive function such as a hydroxyl or an amine during a synthesis and on the other hand allows the reactive function to be restored intact at the end of synthesis. Examples of protective groups and also methods of protection and deprotection are given in "Protective Groups in Organic Synthesis", Greene et al., 4th Edition (John Wiley & Sons, Inc., New York).

A leaving group in the text below is a group that can be readily cleaved from a molecule by breaking a heterolytic bond, with departure of an electron pair. This group may thus be replaced easily by another group during a substitution reaction, for example.

Such leaving groups are, for example, halogens or an activated hydroxyl group such as methanesulphonate, benzenesulphonate, p-toluenesulfonate, triflate, acetate, etc.

Examples of leaving groups and also references for preparing them are given in "Advanced Organic Chemistry", J. March, 3rd Edition, Wiley Interscience, pp. 310-316.

In accordance with the invention, the compounds of general formula (I) may be prepared according to the processes that follow.

Unless otherwise mentioned, R1 and R2 are as defined previously.

Scheme 1 : preparation of the pyrazolonaphthyridinone intermediates of formula (VI)

wherein X, Y, R1 and PG are as described above, Ra represents a chlorine or bromine atom, and compounds of formula (II) (IV) (V) and (VI) respectively comprise:

compounds of formula (I la), (IVa), (Va) and (Via) for which X represents a nitrogen atom, Y represents CH, and Rb represents an iodine atom and compounds of formula (lib), (IVb), (Vb) and (Vlb) for which X represents CH, Y represents a nitrogen atom, and Rb represents a chlorine, bromine or iodine atom.

Scheme 1 illustrates a chemical route for the synthesis of the compound of formula (VI) from the amino-pyridines of formula (Ma) with Ra being chlorine or bromine and Rb being iodine or from amino-pyridines of formula (Mb) with Ra being chlorine or bromine and Rb being chlorine or bromine or iodine. The amino-pyridines (II) react with an acid fluoride of formula (III) comprising a protecting group on the pyrazole that is stable in basic medium such as SEM or THP in the presence of a base such as fBuOK or NaH in a solvent such

as THF or DMF, at room temperature, to give the amide of formula (IV). The amide of formula (IV) may be alkylated with an electrophilic group R1-LG in which LG is a good leaving group such as a halogen or a triflate, in the presence of a base such as NaH, fBuOK, in an inert solvent such as DMF or MeTHF, at room temperature or by heating up to 80°C. The A/-alkyl compounds of formulae (Va) and (Vb) are predominantly obtained versus their O-alkyl isomers, and are then engaged in an intramolecular Heck reaction catalysed with palladium, for example with Pd(PPh3)4, in the presence of a weak base such as triethylamine or sodium or potassium acetate, in a solvent such as DMF or NMP, while heating to between 60 and 120°C to give the protected 1 ,5-dihydro-4H- pyrazolo[4,3-c][1 ,6]naphthyridin-4-one of formula (Via) and the protected 1 ,5-dihydro-4H- pyrazolo[4,3-c][1 ,5]naphthyridin-4-one of formula (Vlb) respectively.

Scheme 2 (route A): production of the compounds of formula (I) from the intermediates of formula (VI)

wherein X, Y, R1 , Ra and PG are defined as described above.

The halogenated derivative of formula (VI) may be engaged in an organometallic coupling reaction catalysed with palladium, for example PdCI2(dppf), Pd(PPh3)4, Pd(f-Bu3P)2 either with boronic acids or esters or with tin derivatives, in the presence or absence of a phosphine ligand and/or of a weak base such as caesium carbonate or potassium carbonate, in a solvent such as DMF or dioxane or in the presence of water, by heating to between 80 and 150°C, to give the compounds of formula (VII) with R2 being as described previously. Finally, the compounds of formula (I) are obtained after deprotection of the pyrazole of the compounds of formula (VII) under suitable conditions according to the protecting group PG. For example, when PG represents SEM or THP in the compounds of formula (VII), a treatment in acidic medium, for example with TFA or anhydrous dilute HCI, makes it possible to obtain the compounds of formula (I).

Scheme 3 (route B): alternative to the preparation of the compounds of formula (I) via the boronic acid or ester of formula (VIII)

wherein X, Y, R1 , Ra and PG are as described above and each Rc represents a hydrogen atom or the two groups Rc are each a carbon atom and are bonded together, and are non substituted or substituted with one or more (C1-C4) alkyl group.

The halogenated derivative of formula (VI) obtained according to the processes described in Scheme 1 may be converted into the boronic acid or ester of formula (VIII), via a palladium-catalysed coupling reaction with for example Pd(dba)2 with a diborane derivative, for example bis(pinacolato)diborane, in the presence of a base such as potassium acetate and in the presence or not of a phosphine ligand. The boronic acid or ester of formula (VIII) may be engaged in a palladium-catalysed Suzuki coupling reaction with aromatic or heteroaromatic substituents R2 bearing a leaving group E such as a halogen atom, for instance chlorine, bromine or iodine or a triflate group, to give the compounds of formula (VII) that allows preparation of the compounds of formula (I) as described previously.

When R2 is an aryl or an heteroaryl group substituted with one halogen atom, that halogen atom may be substituted by a primary or secondary amine in the presence or absence of a palladium(O) or copper(l) catalyst, in the presence or absence of a base, to give the compounds in which R2 is an aryl or a heteroaryl substituted by NR6R6' or an heterocyclyl group.

In Schemes 1 -3, the starting compounds and the reagents, when their preparation method is not described, are commercially available or described in the literature, or else may be prepared according to methods that are described therein or that are known to those skilled in the art.

According to another of its aspects, a subject of the invention is also compounds of formulae (IV). These compounds are useful as intermediates for synthesizing compounds of formula (I).

According to another of its aspects, a subject of the invention is also compounds of formulae (V). These compounds are useful as intermediates for synthesizing compounds of formula (I).

According to another of its aspects, a subject of the invention is also compounds of formulae (VI). These compounds are useful as intermediates for synthesizing compounds of formula (I).

According to another of its aspects, a subject of the invention is also compounds of formulae (VII). These compounds are useful as intermediates for synthesizing compounds of formula (I).

According to another of its aspects, a subject of the invention is also compounds of formulae (VIII). These compounds are useful as intermediates for synthesizing compounds of formula (I).

The examples that follow describe the preparation of certain compounds in accordance with the invention. The examples are not limiting, but serve merely to illustrate the present invention. The table herein below illustrates the chemical structures and physical properties of a number of compounds according to the invention.

The following abbreviations and empirical formulae are used:

EtOAc ethyl acetate

DCM dichloromethane

DMF A/,A/-dimethylformamide

DMSO dimethyl sulfoxide

HCI hydrogen chloride

HPLC high-performance liquid chromatography

LCMS liquid chromatography/mass spectrometry

MeOH methanol

MeTHF 2-methyltetrahydrofuran

MHz MegaHertz

NaCI sodium chloride

NaHC03 sodium hydrogen carbonate

Na2S04 sodium sulfate

NMP A/-methylpyrrolidinone

PdCI2(dppf) [1 , 1 '-bis(diphenylphosphino)ferrocene]dichloropalladium(ll)

Pd(PPh3)4 tetrakis(triphenylphosphine)palladium(0)

Pd(OAc)2 palladium(ll) acetate

Pd(f-Bu3P)2 bis(tri-ferf-butylphosphine)palladium(0)

Pd(dba)2 bis(dibenzylideneacetone)palladium(0)

f-BuOK potassium fert-butoxide

TFA trifluoroacetic acid

THF tetrahydrofuran

THP tetrahydropyranyl

SEM 2-(trimethylsilyl)ethoxy]methyl

°C degrees Celsius

min minute(s)

mL milliliter(s)

mmol millimole(s)

ppm parts per million

In the text herein below:

- the proton magnetic resonance spectra ( H NMR), as described below, are recorded at 400 MHz or 500 MHz in DMSO-d6, using the DMSO-d6 peak as reference. The chemical shifts δ are expressed in parts per million (ppm). The signals observed are expressed as follows: s = singlet; d = doublet; t = triplet; m = multiplet or br. s. = broad singlet;

- the LCMS characteristics, as described below, successively indicated the high-performance liquid chromatography analytical method used and detailed below (A to E), the [M+H]+ peak identified by mass spectrometry and the retention time (RT) of the compound, expressed in minutes.

* Method A

Instrument: HPLC line of the type 1 100 (Agilent) or Alliance (Waters); simple quadrupole mass spectrometer of the type MSD (Agilent) or ZQ (Waters)

Column: Symmetry C18 3.5 μηι (2.1 x 50 mm) Waters

Solvent A: H20 + 0.005% TFA; Solvent B: CH3CN + 0.005% TFA

Flow rate: 0.4 mL/min

Gradient A/B: 100/0 (to min) to 0/100 (t10 min) to 0/100 (t15 min)

Detection: UV 220 nm

Ionization: electrospray positive mode ESI+

* Method B

Instrument: UPLC Acquity line (Waters); SQD mass spectrometer (Waters)

Column: BEH C18 (2.1 x 50 mm) 1.7 μηι (Waters); column temp.: 55°C

Solvent A: H20 +0.02% HCOOH; Solvent B: CH3CN +0.02% HCOOH

Flow rate: 1 mL/min

Gradient A/B: 98/2 (to min) to 2/98 (t4 min) to 2/98 (.4.5 min)

Detection: UV 220 nm

Ionization: electrospray positive mode ESI+

* Method C

Instrument: HPLC line of the type 1 100 (Agilent) or Alliance (Waters); simple quadrupole mass spectrometer of the type MSD (Agilent) or ZQ (Waters)

Column: Luna C18(2)-HST Phenomenex (30 x 2 mm) 2.5 μηι; column temp.: 50°C Solvent A: H20 + 0.05% TFA; Solvent B: CH3CN + 0.035% TFA

Flow rate: 1 mL/min

Gradient A/B: 100/0 (to min) to 0/100 (12.5 min) to 0/100 (13.5 min)

Detection: UV 220 nm

Ionization: electrospray positive mode ESI+

* Method D

Instrument: Waters UPLC

Column: BEH C18 (2.1x50 mm) 1.7 μηι

Solvent A: H20 + 0.05% HC02H; Solvent B: CH3CN + 0.035% HC02H

Flow rate: 0.9 mL/min

Gradient A/B: 95/5 (to min) to 5/95 (t1.1 min) to 5/95 (t1.7 min)

Detection: 220 nM

Ionization: electrospray positive mode ESI+

* Method E

Instrument: Waters UPLC

Column: Waters XBridge C18 (4.6x50 mm) 2.5 μηι

Solvent A: H20 + 0.1 % HC02H; Solvent B: CH3CN + 0.08% HC02H

Gradient A/B: 97/3 (to min) to 40/60 (13.5 min) to 2/98 (t4 min) to 2/98 (t5 min)

Detection: 220 nM

Ionization: electrospray positive mode ESI+

Example 1 : 7-(2-chloropyridin-3-yl)-5-(2,2,2-trifluoroethyl)-1 ,5-dihydro-4W-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one chloride (compound no.1 )

Step 1.1. W-(2-chloro-5-iodopyridin-4-yl)-1 -(tetrahydro-2W-pyran-2-yl)-1 H-pyrazole-4-carboxamide

1-(Tetrahydro-2H-pyran-2-yl)-1 H-pyrazole-4-carbonyl fluoride [CAS no. 848818- 60-0] (8.99 g, 35 mmol) was added to a solution of 2-chloro-4-amino-5-iodopyridine [CAS no. 800402-12-4] (7.0 g, 35 mmol) and of f-BuOK (3.96 g, 35 mmol) in 180 ml of anhydrous THF stirred for 20 min at 0°C and under nitrogen. The reaction mixture was stirred at ambient temperature for 3 h and then poured into a saturated aqueous solution of NaHC03 and extracted with EtOAc. The organic phase was washed with water and then with a saturated aqueous solution of NaCI, dried over Na2S04, filtered and concentrated to dryness. After purification by silica flash chromatography (cyclohexane/EtOAc, gradient: from 90/10 to 50/50), 3.76 g of a white powder were obtained (yield: 25%).

LCMS (method C): [M+H]+ = 433.0, RT = 2.17 min

Step 1.2. A -(2-chloro-5-iodopyridin-4-yl)-A -(2,2,2-trifluoroethyl)-1 -(tetrahydro-2W-pyran-2-yl)-1 W-pyrazole-4-carboxamide

f-BuOK (5.60 g, 50 mmol) was added portionwise at ambient temperature to a solution of A/-(2-chloro-5-iodopyridin-4-yl)-1 -(tetrahydro-2H-pyran-2-yl)-1 H-pyrazole-4-carboxamide (18 g, 42 mmol) in 200 ml of anhydrous MeTHF under nitrogen. The reaction medium became yellow. After stirring the mixture at 60°C for 30 min, 2,2,2-trifluoroethyltrifluoromethanesulfonate (7.2 ml, 50 mmol) was added. The reaction mixture was stirred at 60°C for 2 h, poured into a saturated aqueous solution of NaHC03 and extracted with EtOAc. The organic phase was washed with water and then with a saturated aqueous solution of NaCI, dried over Na2S04, filtered and concentrated to dryness. After purification by silica flash chromatography (cyclohexane/EtOAc, gradient: 80/20 to 40/60), 13.4 g of a white powder were obtained (yield: 62%).

LCMS (method C): [M+H]+ = 514.8, RT = 2.31 min

Step 1.3. 7-chloro-5-(2,2,2-trifluoroethyl)-1 -(tetrahydro-2W-pyran-2-yl)-1 ,5-dihydro-4W-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

Pd(PPh3)4 (2.83 g, 2 mmol) was added portionwise to a solution of A/-(2-chloro-5-iodopyridin-4-yl)-A/-(2,2,2-trifluoroethyl)-1-(tetrahydro-2 - -pyran-2-yl)-1 - -pyrazole-4-carboxamide (6.30 g, 12 mmol) and of potassium acetate (3.0 g, 31 mmol) in 150 ml of anhydrous DMF under nitrogen and which had been heated to 100°C. The reaction mixture was stirred at 100°C for 2 h, cooled, concentrated to dryness. The residue was dissolved in EtOAc and the solution was washed with a saturated aqueous solution of NaHC03. The organic phase was washed with water and then with a saturated aqueous solution of NaCI, dried over Na2S04, filtered and concentrated to dryness. After purification by silica flash chromatography (cyclohexane/acetone, gradient: 90/10 to 70/30), 2.70 g of a white powder were obtained (yield: 56%).

LCMS (method C): [M+H]+ = 387.0, RT = 2.30 min

Step 1.4. 7-(2-chloropyridin-3-yl)-1 -(tetrahydro-2W-pyran-2-yl)-5-(2,2,2-trifluoroethyl)-1 ,5-dihydro-4W-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

7-Chloro-5-(2,2,2-trifluoroethyl)-1-(tetrahydro-2 - -pyran-2-yl)-1 ,5-dihydro-4H-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one (30 mg, 0.08 mmol), 2-chloro-3-pyridinylboronic acid (30 mg / 0.16 mmol), Pd(PPh3)4 (20 mg, 0.02 mmol), potassium carbonate (0.60 g, 0.19 mmol), 0.8 ml of dioxane and 0.2 ml of water were successively introduced, under nitrogen, into a microwave reactor. The reactor was sealed and the reaction mixture was heated at 120°C for 25 min in a microwave. The reaction medium was cooled, concentrated to dryness, taken up in EtOAc and poured into a saturated aqueous solution of NaHC03. The organic phase was washed with water and then with a saturated aqueous solution of NaCI, dried over Na2S04, filtered and concentrated to dryness. After purification by silica flash chromatography (cyclohexane/DCM, gradient: 80/20 to 60/40), 10 mg of a white powder were obtained (yield: 24%).

LCMS (method C): [M+H]+ = 464.0, RT = 2.28 min

Step 1.5. 7-(2-chloropyridin-3-yl)-5-(2,2,2-trifluoroethyl)-1 ,5-dihydro- W-pyrazolo[4,3-c][1 ,6]naphthyridir -one hydrochloride

A 4M solution of anhydrous hydrogen chloride in dioxane (0.23 ml, 0.91 mmol) was added to a solution of 7-(2-chloropyridin-3-yl)-1-(tetrahydro-2H-pyran-2-yl)-5-(2,2,2-trifluoroethyl)-1 ,5-dihydro-4H-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one (40 mg, 0.09 mmol) in 3 ml of DCM. After stirring at ambient temperature for 16 h, the precipitate formed was filtered off. The solid obtained was taken up in diisopropyl ether, filtered and dried under vacuum to give 20 mg of a white powder (hydrochloride, yield: 70%).

LCMS (method B): [M+H]+ = 380.0, RT = 1.41 min

H-NMR [(CD3)2SO, 400 MHz]: 9.46 (1 H, s); 8.61 (1 H, s); 8.56 (1 H, dd); 8.12 (1 H, s); 8.08 (1 H, dd); 7.63 (1 H, dd); 5.42 - 5.30 (2H, q); 4.61 (1 H, br s)

Example 2: 7-(2-chloropyridin-3-yl)-5-(2,2,2-trifluoroethyl)-1 ,5-dihydro-4W-pyrazolo[4,3-c][1 ,5]naphthyridir -one hydrochloride (compound no. 37)

Step 2.1. A -(2,5-dichloropyridin-3-yl)-1 -(tetrahydro-2W-pyran-2-yl)-1 H-pyrazole-4-carboxamide

The product was obtained according to the procedure described in Step 1.1 , using

4-amino-2,5-dichloropyridine [CAS no. 78607-32-6]. After purification by silica flash chromatography (cyclohexane/EtOAc, gradient: 80/20 to 50/50), a white powder was obtained (yield: 23%).

LCMS (method B): [M+H]+ = 341.0, RT = 1.14 min

Step 2.2. A -(2,5-dichloropyridin-3-yl)-A -(2,2,2-trifluoroethyl)-1 -(tetrahydro-2W-pyran-2-yl)-1 W-pyrazole-4-carboxamide

2,2,2-Trifluoroethyltrifluoromethanesulfonate (1.47 ml, 10 mmol) was added to a solution of A/-(2,5-dichloropyridin-3-yl)-1 -(tetrahydro-2 - -pyran-2-yl)-1 H-pyrazole-4-carboxamide (2.90 g, 8.5 mmol) and of f-BuOK (1 .14 g, 10 mmol) in 42 ml of anhydrous MeTHF stirred for 20 min at 60°C and under nitrogen. The reaction mixture was heated at 60°C for 2 h, cooled to ambient temperature, poured into water and extracted with EtOAc. The organic phase was washed with water and then with a saturated aqueous solution of NaCI, dried over Na2S04, filtered and concentrated to dryness. After purification by silica flash chromatography (cyclohexane/EtOAc, gradient: from 100/0 to 80/20), the product was obtained in the form of a white powder (yield: 20%).

CLAIMS

1. Compound of the Formula (I)

in which:

X represents CH or a nitrogen atom,

Y represents CH or a nitrogen atom, where X or Y is a nitrogen atom,

R1 represents a (Ci-C4)alkyl non substituted or substituted with one or more halogen atoms,

R2 represents an aryl or a heteroaryl group, non substituted or substituted with one or more substituents independently selected from:

- a halogen atom

a (C1-C4)alky group, where the alkyl group is non-substituted or substituted with one or more substituents independently selected from a halogen atom, a heterocyclyl, (C1-C4)alkoxy or hydroxy group or NHR3

- 0-R4

- (CO)NR5R5'

a heterocyclyl group, non substituted or substituted with one or more (C1- C4)alkyl group

- a cycloalkyl group

- a cyano group

- NR6R6.

- S02NR6R6.

- NH(CO)R7

- (CO)R8 and

- a heteroaryl group

R3 represents a (C1-C4)alkyl or a cycloalkyl group,

R4 represents a hydrogen atom or a (C1-C4)alkyl group, where the alkyl group is non substituted or substituted with one or more halogen atom or heterocyclyl group,

R5 and R5- represent independently a hydrogen atom, a (C1-C4)alkyl or aryl group, R6 and R6' represent independently a hydrogen atom or a (C1-C4)alkyl group,

R7 represents a (C1-C4)alkyl group, and

R8 represents a (C1-C4)alkyl, (C1-C4)alkoxy, cycloalkyl or hydroxy group,

in the form of a base, enantiomers, diastereoisomers, tautomers including racemic mixture, and addition salt with an acid.

2. Compound of formula (I) according to claim 1 , characterized in that X represents a nitrogen atom and Y represents CH, in the form of a base, enantiomers, diastereoisomers, tautomers including racemic mixture, and addition salt with an acid.

3. Compound of formula (I) according to claim 1 , characterized in that X represents CH and Y represents a nitrogen atom, in the form of a base, enantiomers, diastereoisomers, tautomers including racemic mixture, and addition salt with an acid

4. Compound of formula (I) according to any one of claims 1 to 3, characterized in that R1 represents a (Ci-C4)alkyl group non substituted or substituted with one or more fluorine atoms, in the form of a base, enantiomers, diastereoisomers, tautomers including racemic mixture, and addition salt with an acid.

5. Compound of formula (I) according to claim 4 characterized in that R1 represents a trifluoroethyl group, in the form of a base, enantiomers, diastereoisomers, tautomers including racemic mixture, and addition salt with an acid.

6. Compound of formula (I) according to any one of claims 1 to 5, characterized in that R2 represents an aryl group non substituted or substituted with one or more substiutents independently selected from:

a halogen atom

- a (Ci-C4)alkyl group, where the alkyl group is non substituted or substituted with one or more substituents independently selected from a halogen atom, a heterocyclyl, (Ci-C4)alkoxy or hydroxy group or NHR3

" a hydroxy group

- O-R 4

- (CO)NHR5

a heterocyclyl group, non substituted or substituted with a (Ci -C4)alkyl group

- NR6R6.

- S02NR6 R6,

- NHS02R7

- NH(CO)R7

- (CO)R8 and

- a heteroaryl group,

in the form of a base, enantiomers, diastereoisomers, tautomers including racemic mixture, and addition salt with an acid.

7. Compound of formula (I) according to claim 6, characterized in that R2 represents a phenyl group, in the form of a base, enantiomers, diastereoisomers, tautomers including racemic mixture, and addition salt with an acid.

8. Compound of formula (I) according to any one of claims 1 to 5, characterized in that R2 represents a heteroaryl group non substituted or substituted with one or more

substituents independently selected from:

a halogen atom

- a (Ci-C4)alkyl group, where the alkyl group is non substituted or substituted with one or more substituents independently selected from a halogen atom, a heterocyclyl, (Ci-C4)alkoxy or hydroxy group or NHR3

- 0-R4

a heterocyclyl group, non substituted or substituted with a (Ci -C4)alkyl group - a cycloalkyl group

- a cyano group

- NR6R6. and

- (CO)R8,

in the form of a base, enantiomers, diastereoisomers, tautomers including racemic mixture, and addition salt with an acid.

9. Compound of formula (I) according to claim 8, characterized in that R2 represents an heteroaryl group comprising 1 or 2 nitrogen atoms, in the form of a base, enantiomers, diastereoisomers, tautomers including racemic mixture, and addition salt with an acid.

10. Compound of formula (I) according to claim 8 or 9, characterized in that R2 represents a pyridine, a pyrimidine or a quinoline group, in the form of a base, enantiomers, diastereoisomers, tautomers including racemic mixture, and addition salt with an acid.

1 1 . Compounds of formula (I) according to claim 1 , which are selected from the following list :

7-(2-Chloro-pyridin-3-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

7-Pyridin-2-yl-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

7-[2-(4-Methyl-piperazin-1-yl)-pyridin-4-yl]-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

7-(4-Fluoro-phenyl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

7-o-Tolyl-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

5-(2,2,2-Trifluoro-ethyl)-7-(2-trifluoromethyl-phenyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

7-(2-Fluoro-phenyl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

7-Pyridin-4-yl-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin- 4-one

7-Quinolin-8-yl-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

5-(2,2,2-Trifluoro-ethyl)-7-(2-trifluoromethoxy-phenyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

2-[4-Oxo-5-(2,2,2-trifluoro-ethyl)-4,5-dihydro-1 H-pyrazolo[4,3-c][1 ,6]naphthyridin-7-yl]-benzamide

7-(4-Morpholin-4-yl-phenyl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

7-(6-Amino-pyridin-3-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

7-(2-Fluoro-4-methoxy-phenyl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

4-[4-Oxo-5-(2,2,2-trifluoro-ethyl)-4,5-dihydro-1 H-pyrazolo[4,3-c][1 ,6]naphthyridin-7-yl]-A/-phenyl-benzamide

2-Fluoro-A/-methyl-5-[4-oxo-5-(2,2,2-trifluoro-ethyl)-4,5-dihydro-1 H-pyrazolo[4,3-c][1 ,6]naphthyridin-7-yl]-benzamide

7-(2-Morpholin-4-ylmethyl-phenyl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

7-(2-Ethoxymethyl-phenyl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

A/-Methyl-2-[4-oxo-5-(2,2,2-trifluoro-ethyl)-4,5-dihydro-1 H-pyrazolo[4,3-c][1 ,6]naphthyridin-7-yl]-benzenesulfonamide

7-(3-Chloro-2-hydroxy-phenyl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

7-[2-(2-Pyrrolidin-1-yl-ethoxy)-phenyl]-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

A/-{2-[4-Oxo-5-(2,2,2-trifluoro-ethyl)-4,5-dihydro-1 H-pyrazolo[4,3-c][1 ,6]naphthyridin-7-yl]-phenyl}-methanesulfonamide

7-(3-Pyrazol-1-yl-phenyl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

7-(6-Chloro-2-methyl-pyridin-3-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

A/-lsopropyl-4-[4-oxo-5-(2,2,2-trifluoro-ethyl)-4,5-dihydro-1 H-pyrazolo[4,3-c][1 ,6]naphthyridin-7-yl]-benzenesulfonamide

7-(2-lsopropoxy-pyridin-4-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

7-(5-Methoxy-pyridin-3-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

7-(2-Ethoxy-pyridin-3-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

A/,A/-Dimethyl-2-[4-oxo-5-(2,2,2-trifluoro-ethyl)-4,5-dihydro-1 H-pyrazolo[4,3-c][1 ,6]naphthyridin-7-yl]-benzenesulfonamide

A/-Ethyl-4-[4-oxo-5-(2,2,2-trifluoro-ethyl)-4,5-dihydro-1 H-pyrazolo[4,3-c][1 ,6]naphthyridin-7-yl]-benzenesulfonamide

7-[6-(4-Methyl-piperazin-1-yl)-pyridin-3-yl]-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

7-(2-Morpholin-4-yl-phenyl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

7-(2-Pyrrolidin-1-yl-pyridin-3-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

7-(2-[1 ,4]Diazepan-1-yl-pyridin-3-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

7-[2-(Ethyl-methyl-amino)-pyridin-3-yl]-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

7-(2-Fluoro-pyridin-3-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,6]naphthyridin-4-one

7-(2-Chloro-pyridin-3-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

7-Pyridin-2-yl-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin- 4-one

7-Pyridin-4-yl-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin- 4-one

7-[2-(4-Methyl-piperazin-1-yl)-pyridin-4-yl]-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

3-[4-Oxo-5-(2,2,2-trifluoro-ethyl)-4,5-dihydro-1 H-pyrazolo[4,3-c][1 ,5]naphthyridin-7-yl]-pyridine-2-carboxylic acid methyl ester

7-(6-Amino-pyridin-2-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

7-(2-Dimethylamino-phenyl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

5-(2,2,2-Trifluoro-ethyl)-7-(3-trifluoro

c][1 ,5]naphthyridin-4-one

5-(2,2,2-Trifluoro-ethyl)-7-(5-trifluoromethyl-pyridin-2-yl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

3-[4-Oxo-5-(2,2,2-trifluoro-ethyl)-4,5-dihydro-1 H-pyrazolo[4,3-c][1 ,5]naphthyridin- 7-yl]-pyridine-2-carbonitrile

7-(2-Cyclopropylaminomethyl-phenyl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

7-(4-Cyclopentyl-pyrimidin-5-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

7-(5-Chloro-2-methoxy-pyridin-3-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

7-(3-Methylaminomethyl-pyridin-2-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

7-(4-lsopropyl-pyrimidin-5-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

7-(5-Chloro-pyridin-2-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

7-(3-Chloro-pyridin-2-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

7-(2-Amino-6-methyl-pyrimidin-4-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

7-(2-Amino-phenyl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

5-(2,2,2-Trifluoro-ethyl)-7-(4-trifluoromethyl-phenyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

7-[2-(2-Hydroxy-ethyl)-phenyl]-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

2-[4-Oxo-5-(2,2,2-trifluoro-ethyl)-4,5-dihydro-1 H-pyrazolo[4,3-c][1 ,5]naphthyridin-7-yl]-nicotinonitrile

7-(6-Methyl-pyrimidin-4-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

5-(2,2,2-Trifluoro-ethyl)-7-(6-trifluoromethyl-pyridin-3-yl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

7-(3-Amino-pyridin-4-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

A/-{2-[4-Oxo-5-(2,2,2-trifluoro-ethyl)-4,5-dihydro-1 H-pyrazolo[4,3-c][1 ,5]naphthyridin-7-yl]-phenyl}-butyramide

7-(4-Cyclohexyl-pyrimidin-5-yl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

A/-{2-[4-Oxo-5-(2,2,2-trifluoro-ethyl)-4,5-dihydro-1 H-pyrazolo[4,3-c][1 ,5]naphthyridin-7-yl]-phenyl}-isobutyramide

7-(2-Acetyl-phenyl)-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

7-[4-(cyclopropylcarbonyl)phenyl]-5-(2,2,2-trifluoroethyl)-1 ,5-dihydro-4H-pyrazolo[4,3-c][1 ,5]naphthyridin-4-one

7-Pyridin-3-yl-5-(2,2,2-trifluoro-ethyl)-1 ,5-dihydro-pyrazolo[4,3-c][1 ,5]naphthyridi

4-one

3-[4-Oxo-5-(2,2,2-trifluoro-ethyl)-4,5-dihydro-1 H-pyrazolo[4,3-c][1 ,5]naphthyridin- 7-yl]-pyridine-2-carboxylic acid

in the form of a base, enantiomers, diastereoisomers, tautomers including racemic mixture, and addition salt with an acid.

12. Process for preparing a compound of formula (I) according to any one of claims 1 to 1 1 , characterized in that a compound of formula (VII)

wherein X, Y, R1 and R2 are as described in claim 1 and PG represents a protecting group,

is subjected to a deprotection reaction to obtain a compound of formula (I).

13. Process for preparing a compound of formula (I) according to claim 12, characterized in that a compound of formula (VI)

wherein X, Y and R1 are as described in claim 1 , PG represents a protecting group and and Ra represents a chlorine or bromine atom,

and a compound R2-E, wherein R2 is as described in claim 1 and E represents a leaving group,

are subjected to an organometallic coupling reaction catalyzed with a palladium catalyst, to give a compound of formula (VII).

14. Process for preparing a compound of formula (I) according to claim 12, characterized in that a compound of formula (VI)

wherein X, Y and R1 are as described in claim 1 , PG represents a protecting group and and Ra represents a chlorine or bromine atom,

is subjected to a coupling reaction, catalyzed with a palladium catalyst, with a diborane derivative to give a boronic acid or ester of formula (VIII)

wherein X, Y and R1 are as described in claim 1 , PG represents a protecting group and Rc represents a hydrogen atom or the two groups Rc represent each a carbon atom and are bonded together, non substituted or substituted with one or more (Ci -C4)alkyl group,

and the compound of formula (VIII) is subjected to a Suzuki coupling reaction catalyzed with a palladium catalyst with a compound R2-E, wherein R2 is as described in claim 1 and E represents a leaving group, to give a compound of formula (VII).

15. Compound of formula (VI)

wherein X, Y and R1 are as described in claim 1 , PG represents a protecting group and Ra represents a chlorine or bromine atom.

16. Compound of formula (VII)

wherein X, Y, R1 and R2 are as described in claim 1 and PG represents a protecting group.

17. Compound of formula (VIII)

wherein X, Y and R1 are as described in claim 1 , PG represents a protecting group and each Rc represents a hydrogen atom or the two groups Rc represent each a carbon atom and are bonded together, non substituted or substituted with (Ci-C4)alkyl.

18. Compound of formula (IV)

wherein X and Y are as described in claim 1 , Ra represents a chlorine or a bromine atom, PG represents a protecting group and

- when X is a nitrogen atom, Rb represents an iodine atom and

- when X is CH, Rb represents a chlorine, bromine or iodine atom.

19. Compound of formula (V)

wherein X, Y and R1 are as described in claim 1 , Ra represents a chlorine or a bromine atom, PG represents a protecting group, and

- when X is a nitrogen atom, Rb represents an iodine atom and

- when X is CH, Rb represents a chlorine, bromine or iodine atom.

20. Medicament, characterized in that it comprises a compound of formula (I) according to any one of claims 1 to 1 1 , or an addition salt of this compound with a pharmaceutically acceptable acid of the compound of formula (I).

21 . Pharmaceutical composition, characterized in that it comprises a compound of formula (I) according to any one of claims 1 to 11 , or a pharmaceutically acceptable salt of this compound, and also at least one pharmaceutically acceptable excipient.

22. Compound of formula (I) according to any one of claims 1 to 1 1 , for use as MetAP2 inhibitor.

23. Compound of formula (I) according to any one of claims 1 to 1 1 for use in the treatment or prevention of pulmonary and hepatic fibrosis, of pathologies involving a reactivation of angiogenesis such as diabetic retinopathy, age-related macular degeneration (ARMD) and psoriasis, of any carcinoma having a substantial degree of vascularization, such as lung, breast, prostate, oesophageal, pancreatic, liver, colon or kidney carcinomas or carcinomas that induce metastases, such as colon, breast, liver and stomach carcinomas, and melanomas, of solid tumours, such as pancreatic, breast, prostate, colon or kidney tumours, neuroblastomas and Kaposi's sarcoma, of hepatocarcinomas, cholangiocarcinoma and also malignant mesothelioma, pancreatic cancer, haemoangioma, endometriosis, arthritis and in particular rheumatoid arthritis, autoimmune diseases, obesity and microsporidiosis.