Phenol derivatives and pharmaceutical or cosmetic use thereof

The use of compounds in the treatment of skin disorders is described. In particular, use of a compound of formula (I):or one of its pharmaceutically acceptable salts, solvates or hydrates in the preparation of a medicament to treat skin pathologies is described.

The present invention relates to novel compounds of general formula:

and to the cosmetic or pharmaceutical use thereof.

The present invention proposes to provide novel phenolic derivatives which are powerful androgen receptor modulators.

Among the prior art documents describing molecules which modulate androgen receptor activity, mention may, for example, be made of the phenylimidazolines described in patent application EP 580 459, or application WO 2005/42464.

The invention relates to novel phenolic derivatives that correspond to general formula (I) below:

in which:R1represents a C1-6alkyl, C3-7cycloalkyl, C1-6alkyloxy, —S(O)m—C1-6alkyl, C1-6fluoroalkyl, C1-6fluoroalkyloxy, —(CH2)n—C3-9cycloalkyl, —(CH2)n—C3-9cycloalkyl, C2-6alkyl-OH, —(CH2)n—C1-6alkyloxy, —(CH2)n—C1-6fluoroalkyl, —(CH2)p—O—C1-6fluoroalkyl, CORa, CN, NO2or NR8R9group, a halogen or a phenyl or heteroaryl group containing either a) from 1 to 4 nitrogen atoms or b) an oxygen or sulphur atom and 1 or 2 nitrogen atom(s). These phenyl and heteroaryl groups may be optionally substituted with one to three identical or different Rbgroups,R2represents a C1-6alkyl, C3-7cycloalkyl, C1-6alkyloxy, —S(O)vC1-6alkyl, C1-6fluoroalkyl, C1-6fluoroalkyloxy, —(CH2)q—C3-9cycloalkyl, —(CH2)q—C3-9cycloalkyl, C2-6alkyl-OH, —(CH2)q—C1-6alkyloxy, —(CH2)q—C1-6fluoroalkyl, —(CH2)t—O—C1-6fluoroalkyl, CORd, CN, NO2or NR8′R9′ group, a hydrogen atom, a halogen or a phenyl or heteroaryl group containing either a) from 1 to 4 nitrogen atoms or b) an oxygen or sulphur atom and 1 or 2 nitrogen atom(s). These phenyl and heteroaryl groups may be optionally substituted with one to three identical or different Regroups,R3represents a hydrogen atom or a C1-9alkyl, C3-9cycloalkyl, C1-6fluoroalkyl, —(CH2)t—C3-9cycloalkyl, —C2-6alkyl-OH, —(CH2)u—C1-6alkyloxy, —(CH2)t—C3-7cycloalkyl, —(CH2)t—C1-6fluoroalkyl, or —(CH2)u—O—C1-6fluoroalkyl group,R4, R5, R6and R7are identical or different and represent either a hydrogen atom or a C1-6alkyl, C3-7cycloalkyl, C1-6alkyloxy, —S(O)i—C1-6alkyl, C1-6fluoroalkyl, C1-6fluoroalkyloxy, —(CH2)i—C3-9cycloalkyl, —(CH2)i—C3-9cycloalkyl, —C1-6alkyl-OH, —(CH2)i—C1-6alkyloxy, —(CH2)i—C1-6fluoroalkyl, —(CH2)j—O—C1-6fluoroalkyl, CORa, CN or NR10R11group, or a halogen or a phenyl or heteroaryl group containing either a) from 1 to 4 nitrogen atoms or b) an oxygen or sulphur atom and 1 or 2 nitrogen atom(s). These phenyl and heteroaryl groups may be optionally substituted with one to three identical or different Rcgroups,Ra, Rdand Rfare identical or different and represent a C1-6alkyl, C1-6alkyloxy or NR12R13group,Rb, Rcand Reare identical or different and represent a halogen, or a C1-6alkyl, C3-7cycloalkyl, C1-6alkyloxy, —S(O)k—C1-6alkyl, C1-6fluoroalkyl, C1-6fluoroalkyloxy, —(CH2)g—C3-7cycloalkyl, OH, —(CH2)g—C3-7cycloalkyl, C1-6alkyl-OH, —(CH2)g—C1-6alkyloxy, —(CH2)g—C1-6fluoroalkyl, —(CH2)w—O—C1-6fluoroalkyl, CORf, CN or NR14R15group,R8, R8′, R9, R9′, R10, R11, R12, R13, R14and R15are identical or different and represent a hydrogen atom, or a C1-6alkyl, C3-7cycloalkyl, —(CH2)h—C3-7cycloalkyl or —(CH2)h—C1-6fluoroalkyl group.

Optionally, the R8and R9groups can form, with the nitrogen atom which bears them, a heterocycle such as: azetidine, pyrrolidine, piperidine, azepane, morpholine or piperazine. Optionally, the R8′and R9′groups can form, with the nitrogen atom which bears them, a heterocycle such as: azetidine, pyrrolidine, piperidine, azepane, morpholine or piperazine. Optionally, the R10and R11groups can form, with the nitrogen atom which bears them, a heterocycle such as: azetidine, pyrrolidine, piperidine, azepane, morpholine or piperazine. Optionally, the R12and R13groups can form, with the nitrogen atom which bears them, a heterocycle such as: azetidine, pyrrolidine, piperidine, azepane, morpholine or piperazine. Optionally, the R14and R15groups can form, with the nitrogen atom which bears them, a heterocycle such as: azetidine, pyrrolidine, piperidine, azepane, morpholine or piperazine,g, h, i, n, q and t are different or identical and are equal to 1, 2 or 3,k, l, m and v are different or identical and are equal to 0, 1 or 2,j, p, r, u and w are different or identical and are equal to 2, 3 or 4,
and also the pharmaceutically acceptable salts, solvates or hydrates thereof and the conformers or rotamers thereof.

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

The compounds of formula (I) may exist in the form of bases or of acid-addition salts. Such addition salts form part of the invention. These salts are advantageously prepared with pharmaceutically acceptable acids, 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. These acids may be, for example, picric acid, oxalic acid or an optically active acid, for example a tartaric acid, a dibenzoyltartaric acid, a mandelic acid or a camphorsulphonic acid, and those that form physiologically acceptable salts, such as hydrochloride, hydrobromide, sulphate, hydrogen sulphate, dihydrogen phosphate, maleate, fumarate, 2-naphthalenesulfonate or para-toluenesulphonate. For a review of physiologically acceptable salts, see the Handbook of Pharmaceutical Salts: Properties, Selection and Use by Stahl and Wermuth (Wiley-VCH, 2002).

The solvates or hydrates may be obtained directly after the synthesis process, compound (1) being isolated in the form of a hydrate, for example a monohydrate or hemihydrate, or of a solvate of the reaction or purification solvent.

In the context of the invention, the following definitions apply:Cb-cin which b and c may take values from 1 to 9: a carbon-based chain of b to c carbon atoms, for example C1-6is a carbon-based chain that may contain from 1 to 6 carbon atoms,alkyl: a linear or branched, saturated aliphatic group, for example a C1-6alkyl group represents a linear or branched carbon-based chain of 1 to 6 carbon atoms, for example a methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, pentyl or hexyl,cycloalkyl: a cyclic, optionally branched, saturated carbon-based chain containing from 3 to 7 carbon atoms. By way of example, a C3-7cycloalkyl group represents a carbon-based chain of 3 to 7 carbon atoms, for example a cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl or cycloheptyl,heterocycle: a cyclic or bicyclic, saturated or unsaturated hydrocarbon-based chain comprising one or more heteroatoms chosen from O, S and N,heteroaryl: an aromatic heterocycle, for example a pyridinyl, pyrazinyl, pyrimidinyl, pyridazinyl, triazinyl, pyrazolyl, isooxazolyl, oxadiazolyl, thiazolyl, thiadiazolyl, triazolyl or imidazolyl group,halogen: a fluorine, chlorine or bromine atom,alkyloxy: an —O-alkyl group,alkylthio: a —S-alkyl group,fluoroalkyl: an alkyl group in which one or more hydrogen atoms have been replaced with a fluorine atom,fluoroalkyloxy: an alkyloxy group in which one or more hydrogen atoms have been replaced with a fluorine atom.

Preference is given to group (A) of the compounds of formula (I) defined above, in which the R1group represents a halogen, or a methyl, ethyl, isopropyl, trifluoromethyl, nitrile, nitro, methoxy, ethoxy, isopropoxy, thiomethyl, thioethyl or thioisopropyl group, and more particularly such that R1represents a halogen, or a methoxy, ethoxy, thiomethyl, thioethyl ou trifluoromethyl group;

Group (B) of the compounds of formula (I) of which the R1substituent is defined above or in the preferred group (A) and such that the R2group is a hydrogen atom.

Particular preference is given to group (C) of the compounds of formula (I) of which the R1and R2substituents are defined above or in the preferred groups (A) or (B) and such that the R3group is a hydrogen atom or a C1-6alkyl group.

The compounds below, and the pharmaceutically acceptable salts, solvates and hydrates thereof, and the conformers or rotamers thereof, are particularly preferred:2-[(5-Bromopyridin-3-ylamino)methyl]phenol2-[(5-Bromopyridin-3-ylamino)methyl]-3-fluorophenol2-[(5-Bromopyridin-3-ylamino)methyl]-4-fluorophenol2-[(5-Methylpyridin-3-ylamino)methyl]phenol2-[(5-Bromopyridin-3-ylamino)methyl]-5-fluorophenol2-[(5-Bromopyridin-3-ylamino)methyl]-3,5-dichlorophenol2-[(5-Bromopyridin-3-ylamino)methyl]-4-chlorophenol2-[(5-Bromopyridin-3-ylamino)methyl]-4,6-difluorophenol2-[1-(5-Bromopyridin-3-ylamino)propyl]phenol2-[1-(5-Bromopyridin-3-ylamino)ethyl]-4-fluorophenol2-[(5-Methoxypyridin-3-ylamino)methyl]phenol2-[1-(5-Bromopyridin-3-ylamino)ethyl]phenol2-[(5-Bromopyridin-3-ylamino)methyl]-3,4-difluorophenol5-(2-Hydroxybenzylamino)nicotinonitrile2-[(5-Chloropyridin-3-ylamino)methyl]phenol2-[1-(5-Bromopyridin-3-ylamino)butyl]phenol2-[1-(5-Bromopyridin-3-ylamino)pentyl]phenol2-[(5-Bromo-6-methylpyridin-3-ylamino)methyl]phenol2-[(5-Bromo-6-methoxypyridin-3-ylamino)methyl]phenol5-(2-Hydroxybenzylamino)-3-methylpyridine-2-carbonitrile2-[(6-Methoxy-5-methylpyridin-3-ylamino)methyl]phenol2-[(6-Chloro-5-methylpyridin-3-ylamino)methyl]phenol2-[(6-Bromo-5-methylpyridin-3-ylamino)methyl]phenol2-[(5,6-Dimethylpyridin-3-ylamino)methyl]phenol2-[(5-Methyl-6-trifluoromethylpyridin-3-ylamino)methyl]phenol.

A subject of the invention is also a process for preparing the compounds of general formula (I).

In accordance with the invention, the compounds of formula (I) may be prepared according to the general process described in Scheme 1 below.

The phenolic compounds of formula (I) in which R1, R2, R3, R4, R5, R6and R7are as defined above can be prepared by means of a reductive amination reaction between an aldehyde or a benzyl ketone (II) and an amine (III) in the presence of a reducing agent, such as, for example, and in a non-limiting manner, sodium triacetoxyborohydride, in a solvent such as dichloromethane, according to Scheme 1 and by analogy with the reactions described, for example, inOrg. Pro. R. &D. (2006) 971-1031.

The functional groups that may be present in the reaction intermediates used in the process may be protected, either permanently or temporarily, with protecting groups that ensure an unequivocal synthesis of the expected compounds. The protection and deprotection reactions are performed according to techniques that are well known to those skilled in the art. The term “temporary protecting group for amines, alcohols or carboxylic acids” means protecting groups such as those described in “Protective Groups in Organic Chemistry”, published by McOmie J. W. F., Plenum Press, 1973, in “Protective Groups in Organic Synthesis”, 2nd edition, Greene T. W. and Wuts P. G. M., published by John Wiley & Sons, 1991, and in “Protecting Groups”, Kocienski P. J., 1994, Georg Thieme Verlag.

The products which are subjects of the present invention have advantageous pharmacological properties; it was in particular noted that they modulate androgen receptor activity.

Tests given in the experimental section illustrate this androgen receptor-modulating activity. The products which are subjects of the present invention exhibit partial or total antagonist or agonist activities. Because of this activity, the products of the invention can be used as medicaments in humans or animals.

These properties make the products of general formula (I) of the present invention usable as medicaments for treating hormone-dependent cancers such as prostate cancer or breast cancer, and also for combating benign prostatic hyperplasia, early puberty, virilization, polycystic ovary syndrome, Stein-Leventhal syndrome, loss of libido, or endometriosis. The compounds exhibiting partial or total agonist activity can in particular be used for treating afflictions such as loss of muscle mass (sarcopenia), muscle atrophy, impotence and male sterility, abnormal male differentiation (hermaphroditism), hypogonadism or osteoporosis. The products of general formula (I) of the invention also find their cosmetic use for body or hair hygiene.

The products of general formula (I) of the invention also find their use in the treatment of hirsutism, acne, seborrhoea, oily skin, androgenic alopecia or hyperpilosity, and they can be used for the production of a medicament for preventing and/or treating hirsutism, androgenic alopecia, hyperpilosity, atopic dermatitis, or sebaceous gland disorders such as hyperseborrhoea, acne, oily skin or seborrhoeic dermatitis. The products of formula (I) can therefore be used in dermatology: they can be used alone or in combination. They can be combined in particular with an antibiotic product, such as derivatives of azelaic acid, fusidic acid or erythromycin or with a retinoid derivative such as tretinoin for the treatment of acne, or with a 5a-reductase inhibitor such as (5alpha,17beta)-N-1,1-dimethylethyl-3-oxo-4-azaandrost-1-ene-17-carboxamide (or Finasteride, Merck, 13th Edition) or azelaic acid or an androgen receptor-blocking agent for the treatment of acne, alopecia or hirsutism, or with a product that stimulates hair growth, such as Minoxidil, for the treatment of alopecia.

A subject of the present invention is also, as medicaments, the compounds of formula (I) as described above, and also the pharmaceutically acceptable salts and pharmaceutically acceptable solvates and/or hydrates thereof.

PROCEDURES

295 mg (1.4 mmol, 1.4 eq) of sodium triacetoxyborohydride are added to a solution of 173 mg (1 mmol, 1 eq) of 5-bromopyridin-3-ylamine (starting material 1) and 122 mg (1 mmol, 1 eq) of 2-hydroxybenzaldehyde (starting material 2) in 20 ml of dichloromethane. The solution is stirred at room temperature for 24 h. The medium is poured into water and stirred for 2 h. The aqueous phase is extracted with dichloromethane. The organic phases are combined, washed with water, and then dried over sodium sulphate. The residue is chromatographed on silica gel (80/20 heptane/ethyl acetate). 2-[(5-Bromopyridin-3-ylamino)methyl]phenol is obtained in the form of a white solid.

Examples 2 to 15

Examples 2 to 15 are described in Table 1 below. The compounds are synthesized according to the procedures described above, replacing the starting materials 1 and 2 mentioned in Example 1 with the products mentioned in Table 1.

Biological Tests

The compounds according to the invention show inhibitory properties on receptors of AR type. This AR receptor-inhibiting activity is measured in a transactivation test through the KdR (resting), KdA (active) and Kdapp (apparent) dissociation constants according to the method set out inJ. Molecular Biology(1965), 12(1), 88-118, Monod J. et al.

The expression “AR-type receptor inhibitor” means, according to the invention, any compound which has a Kdapp dissociation constant of less than or equal to 1 μM, and a KdR/Kda ratio ≦10, in a transactivation test.

The preferred compounds of the present invention have a dissociation constant of less than or equal to 500 nM and advantageously less than or equal to 100 nM.

The transactivation test is carried out in the PALM (PC3 Androgen receptor Luciferase MMTV) cell line which is a stable transfectant containing the PMMTV-neo-Luc (reporter gene) and pSG5puro-AR plasmids.

In this study, the affinity of each product for the 2 receptor states (KdR and KdA) is determined, as is an apparent Kd (Kdpp). This constant is a result of the 2 Kd, but also depends on the initial equilibrium of the receptor between the active state and the resting state (L0) and on its expression level. It is determined by means of the following formula:
1/KdApp=(L0/(1+L0))x(1/KdR)+(1/(1+L0))x(1/KdA)

To determine these constants, “cross curves” of the test product against a reference agonist, methyltrienolone, are produced in 96-well plates. The test product is used at 10 concentrations and the reference agonist at 7 concentrations.

By way of illustration, a Kdapp of 6 nM is obtained for the compound (1), a Kdapp of 5 nM is obtained for the compound (2), a Kdapp of 200 nM is obtained for the compound (4), a Kdapp of 60 nM is obtained for the compound (9) and a Kdapp of 15 nM is obtained for the compound (14).