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Definitions

• the present invention relates to substituted 1-piperazinylacylpiperidine derivatives, their preparation and their therapeutic application.
• the compounds according to the present invention have an affinity for the p75 NTR receptor of neurotrophins.
• Neurotrophins belong to a family of proteins with similar structures and functions, including Nerve Growth Factor (NGF), BDNF (Brain Derived Neurotrophic Factor), neurotrophin 3 (NT-3, Neurotrophin-3), Neurotrophin-4/5 (NT-4/5, Neurotrophin-4/5) and Neurotrophin 6 (NT-6, English Neurotrophin-6).
• NGF Nerve Growth Factor
• BDNF Brain Derived Neurotrophic Factor
• neurotrophin 3 NT-3, Neurotrophin-3
• Neurotrophin-4/5 NT-4/5, Neurotrophin-4/5
• Neurotrophin 6 Neurotrophin 6
• the p75 NTT receiver? a receptor for all neurotrophins, is a transmembrane glycoprotein of the tumor necrosis factor (TNF) receptor family (WJ FRIEDMAN and LA GREENE, Exp Cell Res., 1999, 253, 131-142, I. Meldosis et al, Trends Pharmacol Sci., 2000, 21,
• Apoptosis or programmed cell death is a physiological mechanism of cell removal in many tissues. In particular, apoptosis plays a major role in embryogenesis, morphogenesis and cell renewal. Apoptosis is a genetically controlled phenomenon that occurs only at an advanced and irreversible stage of cell injury.
• apoptosis is involved in several central nervous system pathologies such as amyotrophic lateral sclerosis, multiple sclerosis, Alzheimer's, Parkinson's and Huntington's prion diseases.
• apoptotic neuronal death also occurs very early after cerebral and cardiac ischemia.
• Cell death is also a preponderant phenomenon in atherosclerosis, in fact it is estimated that 80% of the necrosis zones in the primary atherosclerosis lesions in humans (ML BOCHATON-PIALAT et al., Am. J. Pathol., 1995, 146, 1-6, H. PERLMAN, Circulation, 1997, 95, 981-987).
• Apoptosis is also involved in the mechanisms leading to cell death following cardiac ischemia-reperfusion (Yaoita, H. et al., Cardiovasc Res., 2000, 45, 630-641).
• Several studies show that the pro-apoptotic signal p75 NTR dependent is observed in different cell types including neuronal cells, oligodendrocytes, Schwann cells and also liver cells, cardiac and smooth muscle (JM FRADE et al., Nature, 1996 , 383, 166-168, LASACCIA-BONNEFIL P. et al., Nature, 1996, 383, 716-719, M. SOILUHANN et al., J. Neurosci., 1999, 19, 4828-4838; TRUVI et al., Am. J. Pathol,
• the p75 NTR receptor is described as a cellular target of the Prion peptide (V. DELLA-BIANCA et al., J. Biol Chem., 2001, in Press) and of the ⁇ -Amyloid peptide (S. RABIZADEH et al., Proc. Natl Acad Sci USA, 1994, 91, 10703-10706) and would thus be involved in the apoptosis phenomena induced by these compounds.
• These results support the hypothesis that p75 NTR plays an important role in neuronal death induced by the infectious prion protein (transmissible spongiform encephalopathy) or the beta amyloid protein (Alzheimer's disease).
• the p75 NTR receptor is associated with the Nogo receptor and is involved in signaling the inhibitory effects of these myelin proteins on axonal growth.
• the p75 NTR receptor plays a major role in the regulation of neuronal plasticity and in neuronal-glia interactions and thus represents a therapeutic target of choice for promoting nerve regeneration.
• patent application WO 00/59893 describes substituted pyrimidine derivatives which demonstrate an NGF type activity and / or which increase the activity of NGF on PC 12 cells.
• Patent Applications WO 00/69828 and WO 00 / 69829 describe polycyclic compounds that inhibit the binding of NGF to the p75 NTR receptor in cells that do not express the trkA receptor.
• WO 94/11373 discloses pyridazinoquinazolone derivatives which bind to the p75 NTR receptor of neurotrophins.
• WO 94/22866 discloses pyrazoloquinazolone derivatives which specifically bind to NGF in order to avoid its binding to the p75 NTR receptor but allowing it to interact with the trk receptor.
• WO 01/49684 discloses substituted tetrahydropyridine derivatives which have activity with respect to the modulation of TNF-alpha.
• n is 1 or 2;
• Rj represents a halogen atom; a trifluoromethyl radical; a (C1-C4) alkyl; a (C 1 -C 20) alkoxy, a trifluoromethoxy radical;
• R2 represents a hydrogen atom or a halogen atom
• R3 represents a hydrogen atom; a group -OR5; a group -CH2OR5; a group -NRgR; a group -NRgCOR; a group -NRgCONRioRll '•> a -CH2NR12R13 group; a group -CH2N 8CONR14R15; a (C1-C4) alkoxycarbonyl; a group -CONRigRjj; or else R3 constitutes a double bond between the carbon atom to which it is bonded and the adjacent carbon atom of the piperidine ring;
• R4 represents the 1,3-thiazol-2-yl aromatic group of formula:
• R5 represents a hydrogen atom; (C 1 -C 4) alkyl; (C1-C4) alkylcarbonyl;
• R 8 and R 7 each independently represent a hydrogen atom or a (C 1 -C 4 ) alkyl;
• R 8 represents a hydrogen atom or a (C 1 -C 4) alkyl;
• R9 represents a (C ⁇ -C4) alkyl or a group ;
• n 1, 2 or 3;
• R 1 and R 13 each independently represent a hydrogen atom or a
• R13 can also represent a group - (CH2) q-OH, - (CH 2) q -S-CH 3;
• R12 and R13 together with the nitrogen atom to which they are attached constitute a heterocycle selected from aziridine, azetidine, pyrrolidine, piperidine or morpholine;
• q 2 or 3
• Ri 4 and R 5 each independently represent a hydrogen atom or a (C 1 -C 4 ) alkyl
• Rjg and RJJ each independently represent a hydrogen atom or a (C ⁇ -C4) alkyl; RJ may further represent a group - (CH2) q-NRgR7; or R 1 and R 2 together with the nitrogen atom to which they are bonded constitute a heterocycle chosen from azetidine, pyrrolidine, piperidine, morpholine or piperazine which is unsubstituted or substituted in the 4-position by a (C ⁇ -C4) alkyl.
• the compounds of formula (I) may exist in the form of bases or addition salts with acids. Such addition salts are part of the invention.
• salts are advantageously prepared with pharmaceutically acceptable acids, but the salts of other acids that are useful for purifying or isolating the compounds of formula (I) are also part of the invention.
• the compounds of formula (I) may also exist in the form of hydrates or solvates, namely in the form of associations or combinations with one or more water molecules or with a solvent. Such hydrates and solvates are also part of the invention.
• halogen atom is meant a bromine, chlorine, fluorine or iodine atom.
• (C ⁇ -C4) alkyl or (C ⁇ -C5) alkyl, respectively, is meant a linear or branched alkyl radical of one to four carbon atoms or, respectively, of one to five carbon atoms, such as the methyl, ethyl, propyl or isopropyl radical; butyl, isobutyl, sec-butyl, tert-butyl, pentyl, isopentyl, neopentyl or tert-pentyl.
• alkoxy is meant a linear or branched alkoxy radical of one to four carbon atoms, such as methoxy, ethoxy, propoxy, isopropoxy, butoxy, isobutoxy, sec-butoxy or tert-butoxy.
• R is at the 3-position of phenyl and represents a trifluoromethyl radical, a methyl, a methoxy, a trifluoromethoxy radical and R2 represents a hydrogen atom; or R ⁇ is phenyl and the -3-position represents a trifluoromethyl radical and R2 is in position 4 of the phenyl and represents a chlorine atom;
• R3 represents a hydroxy, a methoxy, an aminomethyl, a (methylamino) methyl, a (dimethylamino) methyl; or else R3 constitutes a double bond between the carbon atom to which it is bonded and the adjacent carbon atom of the piperidine ring;
• R4 represents 1,3-thiazol-2-yl; in the form of a base or an addition salt with an acid, as well as with the hydrate or solvate state.
• compounds of formula (I) that are subjects of the invention, mention may be made especially of the following compounds: 1- [4-Hydroxy-4- [3- (trifluoromethyl) -phenyl] -1-piperidinyl] -2- [4- (1,3-thiazol-2-yl) -1-piperazinyl] -1-ethanone;
• R 2 R 2 and R 3 are as defined for a compound of formula (I) and Hal represents a halogen atom, chlorine or bromine preferably, it being understood that when R 3 contains a hydroxyl or amine function, these functions may to be protected, with a compound of formula:
• R4 is as defined for a compound of formula (I); b1) and, after optional deprotection of the hydroxyl or amino functions contained in R3, the compound of formula (I) is obtained.
• the compound of formula (I) is converted into one of its addition salts with an acid.
• R 1, R 2 and R 3 are as defined for a compound of formula (I), it being understood that when R 3 contains a hydroxyl or amine function, these functions may be protected, with a compound of formula:
• R4 is as defined for a compound of formula (I); b2) and, after optional deprotection of the hydroxyl or amine functions contained in R3, the compound of formula (I) is obtained.
• the compound of formula (I) is converted into one of its addition salts with an acid.
• step a1) or in step a2) when a compound of formula (IIa) or (IIb) is reacted with a compound of formula (III), the reaction is carried out in the presence of a base selected from organic bases such as triethylamine, N, N-diisopropylethylamine or N-methylmorpholine or from alkali metal carbonates or bicarbonates such as potassium carbonate, sodium carbonate or sodium bicarbonate and absence or in the presence of an alkali metal iodide such as potassium iodide or sodium iodide.
• the reaction is carried out in a solvent such as acetonitrile, N, N-dimethylformamide, toluene or propan-2-ol and at a temperature between room temperature and the reflux temperature of the solvent.
• step b1) or in step b2) deprotection of the hydroxyl or amine functions contained in R3 is carried out according to standard methods well known to those skilled in the art.
• R3 represents a group -CH2NR12R13 in which R12 and R13 each represent hydrogen: a3) a compound of formula:
• R 1, R 2 and R 3 are as defined for a compound of formula (I), and
• Hal represents a halogen atom, preferably chlorine or bromine, with a compound of formula:
• the compound of formula (I) is converted into one of its addition salts with an acid.
• step a3) the reaction between the compound of formula (IIc) or (IId) and the compound of formula (Bl) is carried out as previously described in step a1) or a2) of the process according to the invention .
• step b3) the reduction of the cyano group of the compound of formula (Ia) is carried out according to the conventional methods.
• the reduction is carried out by hydrogenation, in the presence of a catalyst such as Raney nickel or rhodium on alumina, and in the presence or absence of ammonia, in a solvent such as methanol.
• a catalyst such as Raney nickel or rhodium on alumina
• ammonia in a solvent such as methanol.
• a solvent such as methanol.
• N, N-dimethylformamide or tetrahydrofuran or a mixture of these solvents and at a temperature between room temperature and 60 ° C.
• the compound of formula (I) is converted into one of its addition salts with an acid.
• the dehydration is carried out using, for example, an acetic acid / hydrochloric acid mixture or an acetic acid / sulfuric acid mixture at a temperature of between room temperature and 140 ° C.
• the reaction can also be carried out using p-toluenesulfonic acid in a solvent such as toluene and at a temperature between room temperature and reflux temperature.
• a base such as an alkali metal carbonate such as potassium carbonate
• a solvent such as acetonitrile, N, N-dimethylformamide or tetrahydrofuran
• a compound of formula (I) wherein R 3 is -CH 2 N 12 13 in which R 12 and R 13 together with the nitrogen atom to which they are attached constitute aziridine may also be prepared by cyclization of a corresponding intermediate compound wherein R3 is -CH2NH-CH2CH2-
• a base such as an al
• a compound of formula (I) wherein R3 is -CH2NRgCONR14R15 in which R8 R1.
• a compound of formula (I) wherein R 3 is --CONRI ⁇ RJJ may also be prepared by reaction of a corresponding intermediate compound wherein R 3 is carboxy with a compound of formula HNRigR j according to classical methods of peptide coupling; the corresponding intermediate compound is prepared according to conventional methods by acidic or basic treatment of a compound of formula (I) in which R 3 represents a (C 1 -C 4) alkoxycarbonyl or by reaction of a compound of formula (Ia) with a base strong as an alkali metal hydroxide such as potassium hydroxide, in a solvent such as toluene or ethylene glycol at a temperature between room temperature and the reflux temperature of the solvent.
• a base strong as an alkali metal hydroxide such as potassium hydroxide
• a compound of formula (I) in which R 3 represents a group -CH 2 OR 5 in which R 5 represents a hydrogen atom may also be prepared by acidic or basic treatment of a compound of formula (I) in which R 3 represents a group -CH 2 OR 5 wherein R5 is (C ⁇ -C4) alkylcarbonyl.
• the compounds of formula (I) thus obtained may subsequently be separated from the reaction medium and purified by conventional methods, for example by crystallization or chromatography.
• the reaction is carried out in the presence of a base such as triethylamine, ⁇ , ⁇ -diisopropylethylamine or N-methylmorpholine, in a solvent such as dichloromethane, chloroform, tetrahydrofuran, dioxane or a mixture of these solvents and at a temperature between 0 ° C and room temperature.
• R 1 and R 2 are as defined for a compound of formula (I), with a compound of formula (V) or (VI) respectively under the same operating conditions as above.
• the compounds of formula (V) or (VI) are commercial, known or are prepared according to known methods.
• the compound of formula (III) is prepared according to known methods such as those described in J. Org. Chem., 1953, 18, 1484-1488, J. Med. Chem., 1978, 21 (6), 536-542, Chem. Pharm. Bull, 1991, 39 (9), 2288-2300, Tetrahedron Letters, 1998, 39, 617-620 or WO 97/28129.
• a compound of formula (III) is prepared by reacting a compound of formula: in which W represents hydrogen or an N-protecting group, with a compound of formula:
• Hal-R 4 (Vm) wherein R 4 is as defined for a compound of formula (I) and Hal represents a halogen atom, preferably chlorine, bromine or iodine.
• the reaction is carried out in the presence or absence of base, in an inert solvent such as ethanol, propan-2-ol, n-butanol, acetonitrile or toluene and at a temperature between 0.degree. ° C and the reflux temperature of the solvent.
• a base it is chosen from organic bases such as diisopropylethylamine or from alkali metal carbonates such as sodium or potassium carbonate.
• the reaction is carried out using an excess of the compound of formula (VII).
• the reaction can also be carried out without solvent by heating the mixture of the compounds (VII) and (VIII) at temperatures of the order of 140 ° C. to 180 ° C.
• the compounds of formula (IV) are commercial, known or are prepared according to known methods such as those described in EP-0 474 561, EP-0 673 928 or WO 96/23787.
• the compounds of formula (IV) are generally prepared in protected form on the nitrogen atom of piperidine; after a deprotection step, the compounds of formula (IV) themselves are obtained.
• R 1 and R 2 are as defined for a compound of formula (I) and Hal represents a halogen atom, preferably bromine, with 1-benzyl-4- piperidinone, in a solvent such as diethyl ether or tetrahydrofuran, at a temperature between room temperature and the reflux temperature of the solvent.
• Hal represents a halogen atom, preferably bromine, with 1-benzyl-4- piperidinone, in a solvent such as diethyl ether or tetrahydrofuran, at a temperature between room temperature and the reflux temperature of the solvent.
• organomagnesium derivatives of formula (IX) are prepared according to standard methods well known to those skilled in the art from the corresponding halogenated derivatives.
• a compound of formula (IV) wherein R3 -CH2NR12R13 wherein R12 and R13 together with the nitrogen atom to which they are attached constitute aziridine, azetidine, pyrrolidine, piperidine or morpholine is prepared according to the previously described methods for a compound of formula (I).
• a strong base such as an alkali metal hydroxide such as sodium hydroxide and a phase transfer catalyst such as a substituted quaternary ammonium salt, trioctylmethylammonium chloride for example, in a solvent such as toluene mixed with water, at a temperature between room temperature and the reflux temperature of the solvent.
• the compounds of formula (IVa) are prepared according to known methods such as those described in Bioorg. Med. Chem. Lett., 1999, 9, 3273-3276 and in J. Med. Chem., 1999, 42 (23), 4778-4793.
• the compounds of formula (IV) in which R 3 represents a (C 1 -C 4) alkoxycarbonyl are prepared by esterification reaction of a corresponding intermediate compound in which R 3 represents a carboxy according to methods known to those skilled in the art; the corresponding intermediate compound is prepared by reacting a compound of formula (IVa) with a strong base such as an alkali metal hydroxide such as potassium hydroxide, in a solvent such as toluene or ethylene glycol at a temperature between room temperature and the reflux temperature of the solvent.
• a strong base such as an alkali metal hydroxide such as potassium hydroxide
• any of the steps of preparing the compounds of formula (I), or intermediate compounds of formula (Ia), (IIa), (Db), (IIc), (IId), (III), IV) it may be necessary and / or desirable to protect reactive or sensitive functional groups, such as amine, hydroxyl or carboxy groups, present on any of the molecules concerned. This protection can be achieved by using the
• N-protecting groups which may be used are the conventional N-protecting groups well known to those skilled in the art, such as for example the tert-butoxycarbonyl, fluorenylmethoxycarbonyl, benzyl or benzhydrylidene group.
• the invention also relates to the compounds of formula (Ia). These compounds are useful as synthesis intermediates for the compounds of formula (I).
• the subject of the invention is compounds of
• R ⁇ represents a halogen atom; a trifluoromethyl radical; a (C1-C4) alkyl; a (C ⁇ -C4) alkoxy; tri luoromethoxy radical;
• R2 represents a hydrogen atom or a halogen atom
• R4 represents the 1,3-thiazol-2-yl aromatic group of formula: in the form of a base or an addition salt with an acid, as well as with the hydrate or solvate state.
• EXAMPLES describe the preparation of certain compounds in accordance with the invention. These examples are not limiting and only illustrate the present invention.
• the numbers of the compounds exemplified refer to those given in TABLE I below, which illustrates the chemical structures and the physical properties of some compounds according to the invention.
• THF tetrahydrofuran
• DCM dichloromethane
• AcOEt ethyl acetate
• DIPEA diisopropylethylamine
• TFA trifluoroacetic acid
• Buffer solution pH 2: solution of 16.66 g of KHSO4 and 32.32 g of K2SO4 in 1 liter of water.
• NMR spectra confirm the structures of the compounds.
• the compounds according to the invention are analyzed by LC / UV / MS coupling (liquid chromatography / UV detection / mass spectrometry).
• the mass spectra of the compounds according to the invention generally have, as base peak, the molecular ion MH.
• a mixture of 180 g of magnesium in 2670 ml of THF is heated to 30 ° C., 33 ml of a solution of 1670 g of 1-bromo-3- (trifluoromethyl) benzene in 1330 ml of THF are added, then slowly the remainder. of the solution so as to reach and then maintain the reflux of THF, and left for 2 hours under reflux with stirring.
• a solution of 1000 g of 1-benzyl-4-piperidinone in 3200 ml of THF is then slowly added and refluxed for 2 hours. After cooling to RT, the reaction mixture is poured over 30 minutes into a solution of 1870 g of ammonium chloride in 6700 ml of water and left stirring for 2 hours at 20-25 ° C.
• a mixture of 1000 g of the compound obtained in the preceding step and 83 g of 10% palladium on carbon (50% moisture) in 2910 ml of EtOH is hydrogenated at 50 ° C. and under 2 bar of pressure. and 2910 ml MeOH.
• the catalyst is filtered, washed twice with 660 ml of MeOH and the filtrate and the washings are concentrated under vacuum.
• a solution of 20 g of the compound obtained at room temperature is cooled in an ice bath.
• a mixture of 2 g of the compound obtained in the preceding step and 0.2 g of palladium on hydrogen is hydrogenated for 3 hours at RT and at atmospheric pressure.
• This compound can also be prepared by following the following three steps: A ') bis (2-chloroethyl) tert-butyl carbamate.
• a mixture of 1.5 g of the compound obtained in step C of Preparation 1.4, 0.15 g of nickel is hydrogenated overnight at RT and at atmospheric pressure.
• a mixture of 9.27 g of the compound obtained in the preceding step in 150 ml of ether is cooled to 0 ° C., 1 g of lithium aluminum hydride is added and the mixture is stirred for 4 hours at 0 ° C. .
• a saturated solution of NH 4 Cl is added to the reaction mixture, the inorganic salts are filtered, the filtrate is extracted with AcOEt, the organic phase is dried over Na 2 SO 4 and the solvent is evaporated off under vacuum. 5.5 g of the expected product are obtained after crystallization from ether.
• This compound is prepared according to the procedure described in step A of Preparation 1.7 from 1.55 g of magnesium in 25 ml of THF, a solution of 14.25 g of 1-bromo-4- (trifluoromethyl) benzene in 15 ml of THF and a solution of
• reaction mixture is concentrated under vacuum, the residue is taken up twice with MeOH and the solvent is evaporated off under vacuum in each case. 5.85 g of the expected product are obtained after crystallization from acetone.
• This compound is prepared according to the procedure described in step A of Preparation 1.7 from 1.55 g of magnesium in 25 ml of THF, a solution of
• This compound is prepared according to the procedure described in step A of Preparation 1.7 from 2 g of magnesium in 25 ml of THF, a solution of 20 g of 1-bromo-3- (trifluoromethoxy) benzene in 15 ml of THF and a solution of 13 g of 1-benzyl-4-piperidone in 30 ml of THF.
• the hydrochloride of the product obtained is formed in a solution of 2N hydrochloric ether. 24.4 g of the expected product are obtained.
• a mixture of 27 g of the compound obtained in the preceding step and 300 ml of ethyl formate is left stirring overnight at RT and then heated at 60 ° C. for 6 hours and left stirring for 48 hours at RT. It is concentrated under vacuum, the residue is taken up in 10% HCl solution, the acidic aqueous phase is washed with ether, ice is added and the mixture is made alkaline by adding 10% NaOH solution, extracted with water. ether, dried the organic phase over Na 2 SO 4 and evaporated the solvent in vacuo. The residue is chromatographed on silica gel H, eluting with DCM and then with a DCM / MeOH mixture.
• a mixture of 21 g of the compound obtained in the preceding step and 2 g of palladium-on-charcoal is hydrogenated for 12 hours at RT and at atmospheric pressure.
• A) 4- (chloroformyl) -4- [3- (trifluoromethyl) phenyl] piperidine hydrochloride A mixture of 1 g of the compound obtained in stage A of Preparation 1.9 and 10 ml of thionyl chloride in 10 ml of DCM is heated at 60 ° C. for 2 hours. It is concentrated under vacuum and 1.05 g of the expected product is obtained, which product is used as it is.
• This compound is prepared according to the procedure described in Preparation 2.12 from 4- (4-chlorophenyl) -4-piperidinol (commercial) and 2-chloroacetyl chloride.
• This compound is prepared according to the procedure described in Preparation 2.1 from the compound obtained in Preparation 1.13 and 2-chloroacetyl chloride.
• This compound is prepared according to the procedure described in Preparation 2.1 from the compound obtained in Preparation 1.14 and 2-chloroacetyl chloride.
• This compound is prepared according to the procedure described in Preparation 2.2 from the compound obtained in Preparation 1.15 and 2-chloroacetyl chloride.
• This compound is prepared according to the procedure described in Preparation 2.1 from the compound obtained in Preparation 1.18 and 2-chloroacetyl chloride.
• This compound is prepared according to the procedure described in Preparation 2.1 from the compound obtained in Preparation 1.19 and 2-chloroacetyl chloride.
• R3 double bond means that R3, together with the adjacent carbon atom of the piperidine ring, forms a double bond, as illustrated in Example 2.
• Me, Et, n-Pr, i-Pr, n-Bu, i-Bu, n-Pe and i-Pe respectively represent methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, n-butyl groups. pentyl and isopentyl.
• the compounds according to the invention have been the subject of biochemical studies.
• the SH-SY-5Y strain (human neuroblastoma) is conventionally cultured in a DMEM (Dulbecco's Modified Eagle's Medium) culture medium (Gibco BRL, France) containing FCS (5%) (fetal calf serum) ( Boehringer Mannheim, Germany), sodium pyruvate (1 mM), anti-PPLO (5 ml) mycoplasma: Tylocine prepared in normal saline, 6000 ⁇ g / ml), gentamycin (O.lmg / ml) and glutamine (4 mM) in culture flasks coated with collagen (Becton Dickinson, France).
• the SK-N-BE parent strain (human neuroblastoma) and the Bep 75 clone expressing the human p75 NTR receptor (SK-N-BE Bep 75) are conventionally cultured in a DMEM culture medium containing FCS (5%), sodium pyruvate (1 mM), anti-PPLO (5 ml), gentamycin (O.lmg / ml) and glutamine (4 mM).
• 125 I NGF to the P75 NTR receptor
• the study of the binding of 125 I NGF is carried out on a cell suspension of the two SH-S Y strains.
• Non-specific binding is determined by measuring total binding after one hour of pre-incubation with the cells at 37 ° C in the presence of labeled non-radioactive NGF (1 ⁇ M). The specific binding is calculated by difference between the measurement of the total binding and the non-specific binding measurement.
• the competition experiments are carried out using an NGF concentration of 0.3 nM.
• the 50% inhibitory concentrations (IC 50) of the binding of 125 I NGF to the p75 NTR receptor of the compounds according to the invention are low and vary from 10 -6 to 10 -6 M U.
• the cells (human neuroblastoma strains SH-SY-5Y and SK-N-BE Bep 75) are placed in 35 mm diameter petri dishes (Biocoat collagen I, (10 5 cells / well) in a culture medium. DMEM containing 5% FCS for 24 hours The culture medium is then removed, the cells are rinsed with PBS (Dulbecco's Phosphate buffered saline) and either fresh medium containing
• FCS 5% of FCS is medium containing NGF at the concentration of 10 ng / ml is added in the presence or absence of the compounds according to the invention.
• Apoptosis rates are measured 48 hours after treatments in the case of the strain SH-SY-5Y and 24 hours later in the case of the strain SK-N-BE Bep 75 by quantification of the cytoplasmic histones associated with the fragments of DNA (cell death detection ELISA,
• Apoptosis rates are expressed as the amount of oligonucleosomes / 105 ⁇ SD cells. Each value corresponds to the average of 9 experimental points distributed in 3 independent experiments.
• the compounds of formula (I) exhibit an NGF-induced apoptosis inhibitory activity with IC 50's which range from 10 6 to 10 -1 .mu.M .
• the binding of the compounds according to the invention to the p75 NTR receptor is reflected firstly on the biochemical level by the inhibition of the dimerization of the receptor. induced by neurotrophins and on the other hand at the cellular level by inhibition of the pro -optotic effect mediated by the p75 NTR receptor.
• the compounds according to the invention can therefore be used for the preparation of medicaments, in particular medicaments intended to prevent or treat any pathology in which the p75 NTR receptor is involved.
• the subject of the invention is medicaments which comprise a compound of formula (I), or an addition salt thereof to a pharmaceutically acceptable acid, or a solvate or a hydrate of compound of formula (I).
• the compounds according to the invention can be used, in humans or in animals, in the treatment or prevention of various dependent p75 NTR disorders such as central and peripheral neurodegenerative diseases such as senile dementia, epilepsy , Alzheimer's disease, Parkinson's disease, Huntington's disease, Down's syndrome, prion diseases, amnesia, schizophrenia; amyotrophic lateral sclerosis, multiple sclerosis
• various dependent p75 NTR disorders such as central and peripheral neurodegenerative diseases such as senile dementia, epilepsy , Alzheimer's disease, Parkinson's disease, Huntington's disease, Down's syndrome, prion diseases, amnesia, schizophrenia; amyotrophic lateral sclerosis, multiple sclerosis
• cardiovascular conditions such as post-ischemic heart damage, cardiomyopathies, myocardial infarction, heart failure, cardiac ischemia, cerebral infarction; peripheral neuropathies (of diabetic, traumatic or iatrogenic origin); damage to the optic nerve and retina; spinal cord trauma and head trauma; atherosclerosis; stenoses; healing ; alopecia.
• the compounds according to the invention can also be used in the treatment of cancers such as that of the lung, thyroid, pancreas, prostate, small intestine and colon, breast, in the treatment of tumors, metastases and leukemias.
• the compounds according to the invention can also be used in the treatment of chronic neuropathic and inflammatory pain and in the treatment of autoimmune diseases such as rheumatoid arthritis.
• the compounds according to the invention can also be used in the treatment of bone fractures, in the treatment or prevention of bone diseases such as osteoporosis.
• the present invention relates to pharmaceutical compositions comprising, as active principle, a compound according to the invention.
• These pharmaceutical compositions contain an effective dose of at least one compound according to the invention, or a pharmaceutically acceptable salt, a solvate or hydrate said compound, as well as at least one pharmaceutically acceptable excipient.
• Said excipients are chosen according to the pharmaceutical form and the desired mode of administration, from the usual excipients which are known to those skilled in the art.
• compositions of the present invention for oral, sublingual, subcutaneous, intramuscular, intravenous, topical, local, intratracheal, intranasal, transdermal or rectal administration the active ingredient of formula (I) above, or its salt, solvate or hydrate, may be administered in unit dosage form, in admixture with conventional pharmaceutical excipients, to animals and humans for the prophylaxis or treatment of the above disorders or diseases.
• Suitable unit dosage forms include oral forms such as tablets, soft or hard capsules, powders, granules and oral solutions or suspensions, sublingual, oral, intratracheal, intraocular, intranasal forms of administration. by inhalation, topical, transdermal, subcutaneous, intramuscular or intravenous administration forms, rectal administration forms and implants.
• the compounds according to the invention can be used in creams, gels, ointments or lotions.
• a unitary form of administration of a compound according to the invention in tablet form may comprise the following components:
• the dose of active ingredient administered per day may be as high as 0.01 mg
• the dosage appropriate to each patient is determined by the physician according to the mode of administration, the weight and the response of said patient.
• the present invention also relates to a method of treatment of the pathologies indicated above which comprises administering to a patient an effective dose of a compound according to the invention, or a pharmaceutically acceptable salt thereof or hydrates or solvates thereof.

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