FR2912136A1 - New pyridinium-substituted cationic thiol derivative fluorescent dye compounds, useful for dyeing keratin fibers, especially for lightening dark human hair - Google Patents

Abstract

New fluorescent dye compounds (I) consist of 2-styryl-N-(sulfanylalkyl)-pyridinium salts or their S-substituted derivatives, where the alkyl of the sulfanylalkyl moiety is interrupted or terminated by an ammonium or cationic heterocyclic moiety. Pyridinium-substituted thiol derivative fluorescent dye compounds of formula (I) and their mineral or organic acid addition salts, optical and geometric isomers, hydrates and other solvates are new. G : NRcRd or optionally substituted (os) 1-6C alkoxy; Rc, RdH, arylalkyl or os 1-6C alkyl; Rg, R'g, Rh, R'hH, halo, NH2, mono- or dialkylamino, CN, COOH, OH, CF3, acylamino, alkoxy, 2-4C mono- or polyhydroxyalkoxy, alkylcarbonyloxy, alkoxycarbonyl, alkylcarbonylamino, acylamino, CONH2, alkylsulfonylamino, SO2NH2 or 1-16C alkyl (os by 1-12C alkoxy, OH, CN, COOH, NH2 or mono- or dialkylamino); R'i, R''iH or alkyl; Ta-N+>(R)(R0>)-; or cationic heterocycloalkyl or heteroaryl; R, R0>H, alkyl, hydroxyalkyl or aralkyl; m, n : 0-6; m + n : 1-10; M' : counter-anion; Y : H, alkali(ne earth) metal, NH4+>, PH4+>, mono-, di-, tri- or tetraalkyl-ammonium, mono-, di-, tri- or tetraalkyl-phosphonium or thiol protecting group; The alkyl moieties have 1-4C unless specified otherwise. If (I) contains additional cationic moieties, at least one further counter-anion is present to preserve electro-neutrality. Independent claims are included for: (1) a dyeing composition (A) comprising (I) and optionally a reducing agent (II) in a cosmetic medium; (2) a method for dyeing keratin fibers, involving application of (A); and (3) a multi-compartment dyeing device, having a first compartment containing (I), a second compartment containing (II) and optionally a third compartment containing an oxidizing agent. [Image].

Description

DYEING COMPOSITION COMPRISING A GROUP THERMAL FLUORESCENT COLORANT

  The invention relates to the dyeing of keratin materials using thiol fluorescent dyes comprising an otho-pyridinium group and a thioxide group. The invention also relates to the dyeing of keratin materials using fluorescent thiol dyes comprising an othopyridinium group and a alkylene chain interrupted.

  It is known to dye keratinous fibers, especially human fibers, by direct dyeing. The method conventionally used in direct dyeing consists in applying to the keratin fibers direct dyes which are colored and dyeing molecules having an affinity for the fibers, allowing them to diffuse and then rinsing the fibers. The direct dyes which are conventionally used are, for example, dyes of the nitrobenzene type, anthraquinone dyes, nitropyridines, dyes of the azo, xanthene, acridine, azine or triarylmethane type. The colorings which result from the use of direct dyes are temporary or semi-permanent dyes because the nature of the interactions which bind the direct dyes to the keratin fiber, and their desorption from the surface and / or the core of the fiber are responsible for their low dyeing power and their poor resistance to washes or perspiration. Furthermore, the coloration of keratinous fibers from conventional direct dyes does not make it possible to significantly lighten the keratin fibers. The lightening of the color of keratinous fibers, more particularly dark to lighter shades, possibly modifying the shade of these, constitutes an important demand. Conventionally, to obtain a lighter coloring, a chemical bleaching process is used. This method consists in treating keratin materials such as keratinous fibers, in particular the hair, by a strong oxidizing system, generally consisting of hydrogen peroxide associated or not with persalts, most often in an alkaline medium. This bleaching system has the drawback of degrading keratin materials, in particular keratinous fibers, in particular human fibers such as the hair, and of altering their cosmetic properties. The fibers tend to become rough, more difficult to disentangle and more fragile. Lastly, the lightening or the bleaching of keratinous fibers by oxidizing agents is incompatible with the treatments for modifying the shape of said fibers, particularly in the straightening treatments. Another lightening technique consists in applying fluorescent direct dyes to dark hair. This technique described in particular in the documents FR 2830189 and WO 2004/091473 makes it possible to respect the quality of the keratinous fiber during the treatment, but the fluorescent dyes employed do not exhibit satisfactory resistance to shampooing.

  To increase the tenacity of the direct dyes, it is known to fix direct dyes by covalent bonding to the hair. For example, it is known to react dyes with reactive groups with the residues of cystine or cysteine very numerous in keratin fibers, see for example Journal of the Society of Dyers and Colourists, Guise and Stapleton, 91, 259-264 ( 1975); Journal of Cosmetic Chemistry, 42, 1-17 (1991); CA 2024509; In addition it is known to protect the thiol function (s) contained in a molecule to be grafted to the hair before applying them to said hair WO99 / 51194. However, this application does not mention the use of fluorescent dyes for coloring or lightening hair.

  The object of the present invention is to provide novel systems for dyeing keratin materials, in particular human keratinous fibers, in particular the hair, which do not have the drawbacks of existing bleaching processes. In particular, one of the aims of the present invention is to provide direct dyeing systems which make it possible to obtain lightening effects, in particular on naturally or artificially dark keratin fibers, which are stubborn in the face of successive shampoos, which do not degrade keratin fibers and which do not alter their cosmetic properties.

  This object is achieved with the present invention which relates to a process for dyeing keratin materials, in particular keratinous fibers, in particular human fibers such as the hair, more particularly the dark hair, consisting in applying to the keratin materials a dye composition. comprising, in a suitable cosmetic medium, at least one fluorescent dye thiol, chosen from the following dyes of formula (I): their organic or inorganic acid salts, optical isomers, geometric isomers, and solvates such as hydrates; formula (I) in which: - G represents a group -NRCRd or C1-C6 alkoxy optionally substituted, in particular unsubstituted; preferentially G represents a group -NRCRd; - R, and Rd identical or different, represent a hydrogen atom, an aryl (C1-C4) alkyl group, or an optionally substituted (C1-C6) alkyl group; R 1 and Rd are particularly hydrogen or (C 1 -C 4) alkyl; - Rg, R'g, Rh and R'h, identical or different, represent a hydrogen atom, halogen, an amino group, (di) (C1-C4) alkylamino, cyano, carboxy, hydroxy, trifluoromethyl, acylamino, (C1-C4) alkoxy, (poly) hydroxyalkoxy C2-C4, (C1-C4) alkylcarbonyloxy (C1-C4) alkoxycarbonyl, (C1-C4) alkylcarbonylamino, acylamino, carbamoyl, (C1-C4) alkylsulfonylamino, a radical aminosulfonyl, or a (C1-C16) alkyl radical optionally substituted with a group selected from (C1-C12) alkoxy, hydroxy, cyano, carboxy, amino, (di) (C1-C4) alkylamino; particularly Rg, R'g, Rh and R'h represent a hydrogen atom or a (C1-C4) alkyl group; - R '; and R ", which may be identical or different, represent a hydrogen atom or a (C 1 -C 4) alkyl group, particularly R 'and R"; represents a hydrogen atom; Ta is: ## STR5 ## where R and R, which may be identical or different, represent a hydrogen atom, a C 1 -C 4 alkyl radical, a C 1 -C 4 hydroxyalkyl radical or a aryl (C1-C4) alkyl; Or a preferentially monocyclic heterocycloalkyl or heteroaryl radical, containing one or two heteroatoms, in particular two nitrogen atoms, and in particular comprising from 5 to 7 ring members; such as imidazolium, piperazinium or homopiperazinium optionally substituted with a (C1-C4) alkyl group such as methyl; m and n, which may be identical or different, represent an integer inclusive between 0 and 6 with m + n represents an integer inclusive inclusive between 1 and 10, in particular the sum m + n is an integer between 4 and 8, preferably m + n is an integer equal to 6, M 'representing an anionic counterion, and Y represents: i) a hydrogen atom, ii) an alkali metal, iii) an alkaline earth metal, iv) an ammonium group: N + RaRaRYR8 or a phosphonium group: P + RaRaRYR8 with Ra, Ra, R7 and R8, which may be identical or different, representing a hydrogen atom ne or a (C 1 -C 4) alkyl group, or v) a protecting group of thiol function; it being understood that: when the compound of formula (I) contains other cationic parts, it is associated with one or more anionic counter-ions making it possible to reach the electroneutrality of formula (I).

  Another subject of the invention is a dyeing composition comprising, in a suitable cosmetic medium, at least one thiol fluorescent dye of formula (I) as defined above, and optionally a reducing agent.

  The invention also relates to new thiol fluorescent dyes of formula (I) as defined above.

  The dyeing process according to the invention makes it possible to visibly stain dark keratin materials, in particular dark human keratin fibers, especially dark hair.

  In addition, the process of the invention makes it possible to obtain a coloration of the keratin materials, in particular human keratinous fibers, in particular the hair, without degrading said material, which is persistent with respect to shampoos, of the common aggressions (sun, perspiration). , and other hair treatments. The process of the invention also makes it possible to obtain a lightening of keratin materials such as keratinous fibers, particularly dark keratinous fibers and more particularly dark hair.

  For the purposes of the invention, dark keratin material is understood to mean that which has an L * luminescence in the C.I.E. L * a * b *, less than or equal to 45 and preferably less than or equal to 40, knowing moreover that L * = 0 is equivalent to black and L * = 100 to white. For the purposes of the invention, the term naturally or artificially dark hair, hair whose pitch is less than or equal to 6 (dark blonde) and preferably less than or equal to 4 (chestnut). The lightening of the hair is evaluated by the variation in pitch before and after application of the compound of formula (I). The notion of tone is based on the classification of natural nuances, a tone separating each nuance from that which follows it or immediately precedes it. This definition and the classification of natural shades is well known to hair professionals and published in the book Science of hair treatment Charles ZVIAK 1988, Ed Masson, p. 215 and 278. The pitch ranges from 1 (black) to 10 (very light blonde), a unit corresponding to a tone; the higher the number, the clearer the nuance. An artificially colored hair is a hair whose color has been modified by a coloring treatment, for example a coloration with direct dyes or oxidation dyes. Preferably, the composition must after application to hair, for example, chestnut, bring to the results below. - We are interested in the reflectance performance of hair when irradiated with visible light in the wavelength range of 400 to 700 nanometers. The reflectance curves are then compared as a function of the wavelength, of the hair treated with the composition of the invention and of the untreated hair. - The curve corresponding to the treated hair must show a reflectance in the wavelength range from 500 to 700 nanometers higher than the curve corresponding to untreated hair. This means that, in the wavelength range of 540 to 700 nanometers, there is at least one range where the reflectance curve corresponding to the treated hair is greater than the reflectance curve corresponding to the untreated hair. The term "superior" means a difference of at least 0.05% reflectance, and preferably at least 0.1%. This does not prevent that there may exist in the wavelength range from 540 to 700 nanometers, at least one range where the reflectance curve corresponding to the treated hair is superimposable, or less than the reflectance curve corresponding to the untreated hair.

  Preferably, the wavelength where the difference is greatest between the reflectance curve of the treated hair and that of the untreated hair is in the wavelength range of 500 to 650 nanometers, and preferably in the the wavelength range from 550 to 620 nanometers.

  For the purposes of the present invention, and unless a different indication is given: the aryl or heteroaryl radicals or the aryl or heteroaryl part of a radical may be substituted by at least one substituent carried by a carbon atom, chosen from: • a C1-C16, preferably C1-C8, alkyl radical optionally substituted with one or more radicals chosen from hydroxyl, C1-C2 alkoxy and (C2-C4) poly (-hydroxyalkoxy) acylamino radicals; amino substituted with two identical or different C 1 -C 4 alkyl radicals, optionally carrying at least one hydroxyl group, or the two radicals being able to form, with the nitrogen atom to which they are attached, a heterocycle comprising from 5 to 7-membered, preferably 5 or 6-membered, optionally substituted saturated or unsaturated ring optionally comprising another heteroatom identical to or different from nitrogen; A halogen atom such as chlorine, fluorine or bromine; • a hydroxyl group; A C1-C2 alkoxy radical; A C1-C2 alkylthio radical; A C2-C4 (poly) -hydroxyalkoxy radical; An amino radical; A 5- or 6-membered heterocycloalkyl radical; A 5- or 6-membered optionally cationic heteroaryl radical, preferentially imidazolium, and optionally substituted with a (C1-C4) alkyl radical, preferably methyl; An amino radical substituted with one or two identical or different C1-C6 alkyl radicals optionally carrying at least: i) a hydroxyl group; ii) an amino group optionally substituted by one or two C1-C3 alkyl radicals; optionally substituted, said alkyl radicals being able to form, with the nitrogen atom to which they are attached, an optionally substituted 5 to 7-membered heterocyclic ring, saturated or unsaturated, optionally comprising at least one other heteroatom different from or different from nitrogen, -NR-COR 'in which the radical R is a hydrogen atom, a C1-C4 alkyl radical optionally bearing at least one hydroxyl group and the radical R' is a C1-C2 alkyl radical; (R) 2N-CO- in which the R radicals, which may be identical or different, represent a hydrogen atom or a C 1 -C 4 alkyl radical optionally bearing at least one hydroxyl group; R'SO2-NR- in which the radical R represents a hydrogen atom, a C1-C4 alkyl radical optionally bearing at least one hydroxyl group and the radical R 'represents a C1-C4 alkyl radical; phenyl radical; (R) 2N-SO 2 - in which the radicals R, which may be identical or different, represent a hydrogen atom, a C 1 -C 4 alkyl radical optionally bearing at least one hydroxyl group, a carboxylic radical in acid form or salified (preferably with an alkali metal or ammonium, substituted or unsubstituted); • a cyano group; A polyhaloalkyl group comprising from 1 to 6 carbon atoms and from 1 to 6 halogen atoms, which are identical or different, the polyhaloalkyl group is, for example, trifluoromethyl; the cyclic or heterocyclic part of a non-aromatic radical may be substituted by at least one substituent carried by a carbon atom chosen from the following groups: • hydroxy, • C 1 -C 4 alkoxy, • (poly) C 2 -C 4 hydroxyalkoxy, A C1-C2 alkylthio radical; RCO-NR'- in which the R 'radical is a hydrogen atom, a C 1 -C 4 alkyl radical optionally bearing at least one hydroxyl group and the R radical is a C 1 -C 2 alkyl substituted amino radical; by two identical or different C1-C4 alkyl groups optionally bearing at least one hydroxyl group; • RCO-O- in which the radical R is a C 1 -C 4 alkyl radical, amino substituted with one or two identical or different C 1 -C 4 alkyl groups optionally carrying at least one hydroxyl group, said alkyl radicals being able to form with the nitrogen atom to which they are attached, an optionally substituted saturated or unsaturated 5- to 7-membered heterocyclic ring optionally comprising at least one other heteroatom different from or different from nitrogen; RO-CO- wherein the radical R is a C1-C4 alkyl radical optionally bearing at least one hydroxyl group; a cyclic, heterocyclic radical or a non-aromatic part of an aryl or heteroaryl radical may also be substituted with one or more oxo or thioxo groups; an aryl radical represents a mono or polycyclic group, condensed or not, comprising from 6 to 22 carbon atoms, and of which at least one ring is aromatic; preferably the aryl radical is a phenyl, biphenyl, naphthyl, indenyl, anthracenyl, or tetrahydronaphthyl; a diarylalkyl radical represents a group comprising, on the same carbon atom of an alkyl group, two identical or different aryl groups, such as diphenylmethyl or 1,1-diphenylethyl; a heteroaryl radical represents a mono- or polycyclic group, fused or otherwise, optionally cationic, comprising from 5 to 22 members, from 1 to 6 heteroatoms chosen from nitrogen, oxygen, sulfur and selenium, and at least one cycle is aromatic; preferably heteroaryl is selected from acridinyl, benzimidazolyl, benzobistriazolyl, benzopyrazolyl, benzopyridazinyle, benzoquinolyl, benzothiazolyl, benzotriazolyl, benzoxazolyl, pyridinyl, tetrazolyl, dihydrothiazolyl, imidazopyridinyl, imidazolyl, indolyl, isoquinolyl, naphthoimidazolyle, naphthooxazolyle, naphthopyrazolyle, oxadiazolyl, oxazolyl, oxazolopyridyl phenazinyl, phenoxazolyl, pyrazinyl, pyrazolyl, pyrilyl, pyrazoyltriazyl, pyridyl, pyridinoimidazolyl, pyrrolyl, quinolyl, tetrazolyl, thiadiazolyl, thiazolyl, thiazolopyridinyl, thiazoylimidazolyl, thiopyrylyl, triazolyl, xanthylyl and its ammonium salt; a diheteroarylalkyl radical represents a group comprising, on the same carbon atom of an alkyl group, two heteroaryl groups, which are identical or different, such as difurylmethyl, 1,1-difurylethyl, dipyrrolylmethyl and dithienylmethyl; a cyclic radical is a non-aromatic cycloalkyl radical, mono- or polycyclic, condensed or otherwise, containing from 5 to 22 carbon atoms, which can comprise from 1 to several unsaturations; particularly the cyclic radical is cyclohexyl;

  - A sterically hindered cyclic radical is a cyclic radical, aromatic or not, substituted or unsubstituted, hindered by steric effect or constraint, comprising from 6 to 14 members, which can be bridged, as sterically hindered radicals include bicyclo [1.1]. Butane, mesylates such as 1,3,5-trimethylphenyl, 1,3,5-triterbutylphenyl, 1,3,5-isobutylphenyl, 1,3,5-trimethylsilylphenyl and adamantyl;

  a heterocyclic radical or heterocycle is a mono or polycyclic non-aromatic radical, condensed or not, containing from 5 to 22 members, having from 1 to 6

  heteroatoms selected from nitrogen, oxygen, sulfur and selenium;

  an alkyl radical is a linear or branched C1-C16 hydrocarbon radical of

C1-C8 preference;

  the optionally substituted expression attributed to the alkyl radical, that is to say that said alkyl radical may be substituted by one or more radicals chosen from i) hydroxyl, ii) C 1 -C 4 alkoxy, iii) acylamino, iv) amino optionally substituted by one or two identical or different C 1 -C 4 alkyl radicals, said alkyl radicals being capable of forming, with the nitrogen atom carrying them, a 5- to 7-membered heterocyl, optionally comprising another heteroatom different from or different from nitrogen; v) or a quaternary ammonium group

  -N R'R "R" ', M for which R', R ", R" ', which are identical or different, represent a + hydrogen atom, or a C1-C4 alkyl group, or else -N R'R "R" 'form

  a heteroaryl such as imidazolium optionally substituted with a C1-C4 alkyl group, and M represents the counterion of the corresponding organic acid, mineral acid or halide,

  an alkoxy radical is an alkyl-oxy or alkyl-O- radical for which the alkyl radical is a hydrocarbon radical, linear or branched, C1-C16, preferably C1-C8;

  an alkylthio radical is an alkyl-S- radical for which the alkyl radical is a hydrocarbon radical, linear or branched, C1-C16 preferably C1-C8; when the alkylthio group is optionally substituted, this implies that the alkyl group is optionally substituted as defined above;

  the boundaries delimiting the range of a range of values lie within this range of values; an organic or inorganic acid salt is more particularly chosen from a salt derived from i) hydrochloric acid HCl, ii) hydrobromic acid HBr, iii) sulfuric acid H 2 SO 4, iv) alkylsulphonic acids: Alk- S (O) 2OH such as methylsulfonic acid and ethylsulfonic acid; v) arylsulfonic acids: Ar-S (O) 2OH such as benzene sulfonic acid and toluene sulfonic acid; (vi) citric acid; vii) succinic acid; viii) tartaric acid; ix) lactic acid, x) alkoxysulfinic acids: Alk-O-S (O) OH such as methoxysulfinic acid and ethoxysulfinic acid; xi) aryloxysulfinic acids such as tolueneoxysulfinic acid and phenoxysulfinic acid; xii) phosphoric acid H3PO4; xiii) acetic acid CH30OOH; xiv) triflic acid CF3SO3H and xv) tetrafluoroboric acid HBF4; an anionic counterion is an anion or an anionic group associated with the cationic charge of the dye; more particularly the anionic counterion is selected from i) halides such as chloride, bromide; ii) nitrates; iii) sulphonates, including C1-C6 alkylsulphonates: Alk-S (O) 2O- such as methylsulphonate or mesylate and ethylsulphonate; iv) arylsulfonates: Ar-S (O) 20-such as benzenesulfonate and toluenesulphonate or tosylate; v) citrate; vi) succinate; (vii) tartrate; viii) lactate; ix) alkyl sulfites: Alk-O-S (O) O- such as methysulfite and ethylsulfite; x) arylsulfites: Ar-O-S (O) O- such as benzenesulphite and toluenesulphite; xi) alkylsulfates: Alk-O-S (O) 2O- such as methyl sulfate and ethylsulfate; xii) arylsulfates: Ar-O-S (O) 2O-, xiii) phosphate; (xiv) acetate; xv) triflate; and xvi) borates such as tetrafluoroborate

  The thiol fluorescent dyes of formula (I) are compounds capable of absorbing in the UV or visible radiation at an Xabs wavelength of between 250 and 800 nm and capable of reemitting in the visible range at a wavelength. Xem emission between 400 and 800 nm. Preferably thiol fluorescent compounds of the invention are dyes capable of absorbing in the visible Xabs between 400 and 800 nm and reemitting in the visible Xem between 400 and 800 nm. More preferably, the thiol fluorescent dyes of formula (I) are dyes capable of absorbing at an Xabs between 420 nm and 550 nm and reemitting in the visible at an Xem of between 470 and 600 nm. The fluorescent compounds of the invention contain a SY function which may be in the covalent -S-Y or ion -S-Y + form depending on the nature of Y and the pH of the medium.

  One particular embodiment relates to thiols fluorescent dyes having a heterocyclic group of formula (I) with SY function where Y represents a hydrogen atom, or an alkali metal. Advantageously, Y represents a hydrogen atom.

  According to another particular embodiment of the invention, in formula (I) above, Y is a protective group known to those skilled in the art such as those described in the books Protective Groups in Organic Synthesis, TW Greene, John Willey & Sons ed., NY, 1981, pp.193-217; Protecting Groups, P. Kocienski, Thieme, 3rd ed., 2005, chap. 5.

  Particularly when Y represents a protecting group of the thiol group, Y is chosen from the following radicals: (C 1 -C 4) alkylcarbonyl, C 1 -C 4 alkylthiocarbonyl, C 1 -C 4 alkoxycarbonyl, C 1 -C 4 alkoxythiocarbonyl, (C 1 -C 4) alkylthiothiocarbonyl, (C 1 -C) (alkyl) aminocarbonyl, (C 1 -C) (alkyl) aminothiocarbonyl, arylcarbonyl as phenylcarbonyl; aryloxycarbonyl; aryl (C1-C4) alkoxycarbonyl; (di) (C1-C4) (alkyl) aminocarbonyl as dimethylaminocarbonyl; (C 1 -C 4) (alkyl) arylaminocarbonyl, carboxy; ^ S03; W with M + representing an alkali metal such as sodium or potassium or W and M 'of the formula (I) are absent; optionally substituted aryl such as phenyl, dibenzosuberyl, or 1,3,5-cycloheptatrienyl, optionally substituted heteroaryl; including in particular cationic or non-cationic heteroaryl, comprising from 1 to 4 following heteroatoms: i) monocyclic with 5, 6 or 7 members such as furanyl or furyl, pyrrolyl or pyrryl, thiophenyl or thienyl, pyrazolyl, oxazolyl, oxazolium, isoxazolyl, isoxazolium thiazolyl, thiazolium, isothiazolyl, isothiazolium, 1,2,4-triazolyl, 1,2,4-triazolium, 1,2,3-triazolyl, 1,2,3-triazolium, 1,2,4-oxazolyl, 1 2,4-oxazolium 1,2,4-thiadiazolyl 1,2,4-thiadiazolium pyrylium thiopyridyl pyridinium pyrimidinyl pyrimidinium pyrazinyl pyrazinium pyridazinyl pyridazinium triazinyl triazinium tetrazinyl tetrazinium azepine azepinium, oxazepinyl, oxazepinium, thiepinyl, thiepinium, imidazolyl, imidazolium; ii) 8 to 11-membered bicyclic compounds such as indolyl, indolinium, benzoimidazolyl, benzoimidazolium, benzoxazolyl, benzoxazolium, dihydrobenzoxazolinyl, benzothiazolyl, benzothiazolium, pyridoimidazolyl, pyridoimidazolium, thienocycloheptadienyl, these mono or bicyclic groups being optionally substituted by one or more groups such as C 1 -C 4) alkyl as methyl, or polyhalo (C 1 -C 4) alkyl as trifluoromethyl; iii) or tricyclic ABC according to: wherein the two rings A, C optionally comprise a heteroatom, and the ring B is a 5-, 6- or 7-membered particularly 6-membered ring and contains at least one heteroatom such as pyperidyl, pyranyl; optionally substituted heterocycloalkyl, optionally cationic heterocycloalkyl represents in particular a saturated or partially saturated 5, 6 or 7 membered monocyclic group comprising from 1 to 4 heteroatoms selected from oxygen, sulfur and nitrogen, such as di / tetrahydrofuranyl, di / tetrahydrothiophenyl, di / tetrahydropyrrolyl, di / tetrahydropyranyl,

  di / tetra / hexahydrothiopyranyl, dihydropyridyl, piperazinyl, piperidinyl, tetramethylpiperidinyl, morpholinyl, di / tetra / hexahydroazepinyl, di / tetrahydropyrimidinyl these groups being optionally substituted by one or more groups such as (C1-C4) alkyl, oxo or thioxo; or the heterocycle represents the following group: ## STR1 ## wherein R ', R'g, R'e, R R ', R'g and R'h, which are identical or different, represent a hydrogen atom or a (C1-C4) alkyl group, or else two groups R'g with R'h and / or R'e with R f form an oxo or thioxo group, or R'g together with R'e together form a cycloalkyl, and v represents an integer inclusive of between 1 and 3, preferably R 'to R'h represent a hydrogen atom, and An represents a counter-ion; isothiouronium -C (NR 'R'd) = N + R'eR'f; An with R', R'd, R'e and R'f, identical or different, represent an atom; hydrogen or a (C 1 -C 4) alkyl group, preferentially R 'to R' f represent a hydrogen atom, and An- represents a counterion, isothiourea -C (NR 'R'd) = NR with R'd, R'e, as defined above; optionally substituted (C1-C4) alkyl (C1-C4) alkyl such as 9-anthracenylmethyl, phenyl; methyl or diphenylmethyl optionally substituted by one or more groups chosen in particular from (C1-C4) alkyl, (C1-C4) alkoxy such as methoxy, hydroxy, (C1-C4) alkylcarbonyl, (di) (C1-C4) (alkyl) amino as dimethylamino; optionally substituted heteroaryl (C 1 -C 4) alkyl, the heteroaryl group is in particular, cationic or non-monocyclic, comprising 5 or 6 members and 1 to 4 heteroatoms chosen from nitrogen, oxygen and sulfur; , such as pyrrolyl, furanyl, thiophenyl, pyridyl, pyridyl N-oxide such as 4-pyridyl or 2-pyridyl-N-oxide, pyrylium, pyridinium, triazinyl, optionally substituted with one or more group such as alkyl particularly methyl preferably (di) heteroaryl (C 1 -C 4) alkyl is (di) heteroarylmethyl or (di) heteroarylethyl; CR'R 2 R 3 with R ', R 2 and R 3, which may be identical or different, representing a halogen atom or a group chosen from: - (C 1 -C 4) alkyl; - (C1-C4) alkoxy; optionally substituted aryl such as phenyl optionally substituted by one or more groups such as (C 1 -C 4) alkyl, (C 1 -C 4) alkoxy, hydroxy; - optionally substituted heteroaryl such as thiophenyl, furanyl, pyrrolyl, pyranyl, pyridyl, optionally substituted with a (C1-C4) alkyl group; -P (Z ') R''R'2R'3 with R'1, and R'2 identical or different represent a hydroxyl group, (C1-C4) alkoxy or alkyl, R'3 represents a hydroxyl group or ( C 1 -C 4) alkoxy, and Z 'represents an oxygen or sulfur atom; sterically hindered cyclic such as adamantyl group; and optionally substituted (C 1 -C 4) alkoxyalkyl such as methoxymethyl (MOM), ethoxyethyl (EOM) and isobutoxymethyl.

  According to a particular embodiment, the protected thiol fluorescent dyes of formula (I) contain a cationic aromatic 5- or 6-membered monocyclic heterocyclic group, Y, comprising 1 to 4 heteroatoms chosen from oxygen, sulfur and nitrogen. , such as oxazolium, isoxazolium, thiazolium, isothiazolium, 1,2,4-triazolium, 1,2,3-triazolium, 1,2,4-oxazolium, 1,2,4-thiadiazolium, pyrylium, pyridinium, pyrimidinium, pyrazinyl, pyrazinium, pyridazinium, triazinium, tetrazinium, oxazepinium, thiepinyl, thiepinium, imidazolium; ii) cationic 8 to 11-membered bicyclic heteroaryl such as indolinium, benzoimidazolium, benzoxazolium, benzothiazolium, these mono or bicyclic heteroaryl groups being optionally substituted with one or more groups such as alkyl as methyl, or polyhalo (C 1 -C 4) alkyl as trifluoromethyl; iii) or heterocyclic according to: R '\, - N R'd An in which R' and R'd, identical or different, represent a hydrogen atom or a (C 1 -C 4) alkyl group; preferentially R 'to R'd represent a (C 1 -C 4) alkyl group such as methyl; and An represents a counterion. Especially Y represents a group chosen from oxazolium, isoxazolium, thiazolium, isothiazolium, 1,2,4-triazolium, 1,2,3-triazolium, 1,2,4-oxazolium, 1,2,4-thiadiazolium, pyrylium, pyridinium , pyrimidinium, pyrazinium, pyridazinium, triazinium and imidazolium, benzoimidazolium, benzoxazolium, benzothiazolium, these groups being optionally substituted by one or more (C1-C4) alkyl groups including methyl. In particular Y represents an alkali metal or a protective group such as: - (C 1 -C 4) alkylcarbonyl such as methylcarbonyl or ethylcarbonyl; arylcarbonyl, such as phenylcarbonyl; - (C1-C4) alkoxycarbonyl; aryloxycarbonyl; -aryl (C1-C4) alkoxycarbonyl; - (di) (C1-C4) (alkyl) aminocarbonyl such as dimethylaminocarbonyl; - (C1-C4) (alkyl) arylaminocarbonyl; optionally substituted aryl such as phenyl; 5- or 6-membered monocyclic heteroaryl such as imidazolyl or cationic 5-6 membered monocyclic heteroaryl, such as pyrylium, pyridinium, pyrimidinium, pyrazinium, pyridazinium, triazinium, imidazolium; these groups being optionally substituted by one or more, identical or different, (C 1 -C 4) alkyl groups such as methyl; - 8 to 11-membered cationic bicyclic heteroaryl such as benzoimidazolium, or benzoxazolium; these groups being optionally substituted by one or more, identical or different, (C 1 -C 4) alkyl groups such as methyl; cationic heterocycle of the following formula: Me N ~ N / Me An - isothiouronium -C (NH2) = N + H2; An; -isothiourea -C (NH2) = NH; By way of example of thiol fluorescent dyes, mention may be made in particular of the following compound: ## EQU1 ## / SH N- NJ ~ N. 2M '~~ SH 2M 3 4 3M' -O / oo o / N = I + OSN ~ OIN ^ ~ -o N _I N ~ SH 2M '2M' / \ 6 \ N ~ With M ', identical or different, representing an anionic counterion.

  The protected thiol dyes of formula (I ") can be synthesized in two steps: the first step of preparing the unprotected thiol dye (I ') 5 according to the methods known to those skilled in the art, for example Thiols and Sulfides, Thiocyanates and Isothiocyanates, organic, Ullmann's Encyclopedia, Wiley-VCH, Weinheim, 2005. And the second step of protecting the thiol function according to conventional methods known to those skilled in the art to lead to protected thiol dyes of formula ( I "). By way of example, to protect the thiol function of the thiol dye, the methods of Protectin Groups in Organic Synthesis, T.W. Greene, John Willey & Sons, Ed., NY, 1981, pp.193-217; Protecting Groups, P. Kocienski, Thieme, 3rd ed., 2005, chap. 5.

  We can illustrate this method by the method consisting of i) generating thiol fluorescent dyes of formula (IH) by reduction of a heterocyclic, two-chromophore fluorescent dye carrying a disulfide function -SS-such as 5 and ii) to be protected according to conventional methods, said thiol function of (1H) with the reagent 7 Y'R to access the protected thiol fluorescent dyes of formula (I '). The thiol compound (1H) may also be metallized with an alkali metal or alkaline earth metal Met * to yield the thiolate fluorescent dye of the formula (I ") 4M '(CH2) m Ta ~ (CFi / Si / Si) ( CH 2) n (CH 2) m R 2 G Metallization 2M '.-- Ta S Met * (CH 2) m ~ (CH 2 / R "), R 1 G with Y' representing a protective group of thiol function; Met * representing an alkali metal or an alkaline earth metal, particularly sodium or potassium, it being understood that when the metal is an alkaline earth metal 2 chromophores with thiolate function -S- may be associated with 1 Metal2 +.

  with Rg, R'g, Rh, R'h, R, R ', m, n, G, and M' are as previously defined; Y 'represents a protecting group of thiol function; R represents a leaving group nucleofuge, such as, for example, mesylate, tosylate, triflate or halide; and Ta + represents the same groups as Ta da of the formula (I). According to another possibility, a thiol compound protected by a protecting group Y 'as defined previously prepared can be reacted according to one of the procedures described in the works cited above, said protected thiol compound comprising at least one nucleophilic function with a sufficient amount , preferably equimolar, of a "reactive fluorescent chromophore" or of a compound comprising such a "reactive fluorescent chromophore" j. In other words, it comprises an electrophilic function to form a covalent bond E as can be schematized below in the preparation of fluorescent dyes of formula (I "'): -12) EE + N - (CH 2) SY' R with Rg, R'g, Rh, R'h, R, R ', m, n, G, and Y' and M 'are as previously defined, Wu represents a nucleophilic group, E represents a group 5 electrophilic, and E the bond generated after nucleophilic attack on the electrophile.

  By way of example, the covalent bonds E that can be generated are listed in the table below from the condensation of electrophiles with nucleophiles: Electrophilic E Nucleophilic ~ u Covalent bonds E Halogen (Hal), Amines: N (R ) (R) -N + (R) (R) - Hal-, Halogen (Hal) heterocycloalkyl Cationic heterocycloalkyl (against ion: Hal-) Halogen (Hal) heteroaryl cationic heteroaryl (against ion: Hal-) Alkoxy (-Oalkyl) Amines : N (R) (R) -N + (R) (R) -Aryloxy (-Oaryl) Amines: N (R) (R) -N + (R) (R) - Alkylsulfate (-OS (O) 2alkyl) Amines : N (R) (R) -N + (R) (R) - (against ion: alkyl-SO3-) Arylsulfate ((-OS (O) 2aryl) Amines: N (R) (R) -N + (R) (R) - (against ion: aryl-SO3-) It is also possible to use a thiol reagent Y'-SH comprising a group Y 'as defined above, the nucleophilic function SH of which can react on the carbon atom in alpha of 1 Halogen atom carried by the fluorescent chromophore 15 to lead to the color protected thiol fluorescent ant of formula (I '): ## STR1 ## with Rg, R'g, Rh, R', R ', R', Ta +, m, n, G, Y ', (I ') and M' are as defined above, and Hal represents a nucleofugal halogen atom such as bromine, iodine or chlorine.

  More particularly, it will be possible to substitute a nucleofugal leaving group with a thiourea group (S = C (NRR) NRR) to generate the isothiouroniums. For example, if the thiourea group is a thioimidazolinium ([3), the reaction scheme is as follows: ## STR1 ## R.sub.1 R.sup.2 R.sub.1 R.sub.1 R.sub.1 R.sub.1 R.sub.1 R.sub.1 R.sub.1 R.sub.1 R.sub.1 R.sub.1 R.sub.1 R.sub.1 R.sub.1 R.sub.1 R.sub.1 R.sub.1 R.sub.1 R.sub.1 R.sub.1 R.sub.1 R.sub.1 R.sub.1 R.sub.1 R.sub.2 R.sup.1 R.sup.1 R. , According to another variant, it is possible to generate an imidazoline intermediate from the halide comprising the fluorescent chromophore (a ') and a thioimidazoline (b') to conduct after alkylation by an R-Gp reagent with R representing an alkyl group and Gp a leaving group such as a halogen such as chlorine, bromine, iodine, or a mesylate or tosylate group, with the fluorescent dye of formula (I ""). (CH 2) m Ta + (CH 2) n Gp SN - R ". An alternative is to use in place of the halide comprising the fluorescent chromophore a chromophore comprising another type of nucleofuge such as tosylate mesylate.

  According to another possibility, certain protected thiol fluorescent dyes (I ") can be obtained by reacting a protected thiol compound with a compound carrying two carboxylic acid functional groups activated by conventional methods (for example reaction with a carbodiimide or with chloride The resultant product is then reacted with a fluorescent chromophore having a nucleophilic function, for example of the primary or secondary amine type, or of the aliphatic alcohol type R'h Rh M '(CH 2) m ## STR3 ## with Rg, R'g, Rh, R'h, R, R ', R'g, R'd, An-, m, n, G, M ', E, Wu and (I "') as defined above.

  A synthetic variant is to combine the first route, ie from two equivalents of the nucleophilic reagent with a disulfide dielectrophile reactant, it is possible to generate, after condensation, the dichromophoric disulfide product (A '), the latter being able to undergo a reduction to form the heterocyclic fluorescent thiol dye which in turn can either be protected to form the protected thiol fluorescent dye (I "') or be metallized with an alkali metal to yield the metallocured heterocyclic thiol fluorescent dye (I"' Metal ) (CH2) m .0 + ù (CR3R4) n Si (CR3R4) n R (CH) m- (CH2) SHR-, protection / Y'-R2G In another possibility, the protected fluorescent thiol dyes of formula (I "') can be obtained by reaction of a compound comprising a thiol group protected by a group Y', and a previously activated hydroxy group in leaving group nucleofuge jj, co for example, mesylate, tosylate, triflate or halide with a styrylpyridine chromophore j.

  With Rg, R'g, Rh, R'h, R, R ', An-, Ta +, m, n, G, M', E, and (I "') are as previously defined. For example, a compound containing a protected thiol group contains a leaving group R, such as, for example, mesylate, tosylate, or triflate, which can undergo the nucleophilic attack of the amine carried by the styryl fluorescent chromophore: Another alternative comes from the use of halides as a leaving group nucleofuge on a thiol compound which may be substituted by a primary amine function, for example carried by a styryl fluorescent chromophore: Rh R 'Rh R' "" Hal HaI ~~ SY ~ NSY G According to another possibility, the thiol fluorescent dyes of formula (I) according to the invention can be obtained by reaction of a compound G comprising a thiol group Y as defined above and an electrophilic group Lfl with a pyridinium compound comprising a nucleophilic group. For example, an aldehyde, ketone or thioaldehyde, thioketone may be condensed when G 'is oxygen or sulfur with an activated methylene such as alkylpyridinium to generate an ethylene> C = C <bond. This reaction is commonly known as Knoevenagel condensation. By activated methylenes is meant those which preferably comprises in the 2- or 4-position of the pyridinium group a methylene group R 1 -CH 2 -: R 2 M '+ ~ TSY + "ù (CH 2) m \ (CH 2) - H ~~~ With Rg, R'g, Rh, R'h, R, R ', Ta, G, G', m, n, Y and M 'as defined above and G representing an atom of oxygen, sulfur, or a group NRa with Ra representing a hydrogen atom or an alkyl group.

  Reference may be made to Advanced Organic Chemistry, Reactions, Mechanisms and Structures, J. March, 4th Ed, John Willey & Sons, 1992 or TW Greene Protective Groups in Organic Synthesis, for further details on operating conditions. for the processes mentioned above. The thiol fluorescent dyes formed can be converted to Y-protected thiols fluorescent dyes by the protection of thiols using conventional protecting groups. The thiol fluorescent dyes are metallated using also conventional methods known to those skilled in the art such as those described in Advanced Organic Chemistry, Reactions, Mechanisms and Structures, J. March, 4th Ed, John Willey & Sons, NY, 1992. Protected thiol dyes may be deprotected by conventional routes such as those described in Protective Groups in Organic Synthesis, TW Greene, John Willey & Sons ed., NY, 1981; Protecting Groups, P. Kocienski, Thieme, 3rd ed., 2005. The starting reagents are commercial or accessible by conventional methods known to those skilled in the art. For example it is possible to synthesize the reagent 5 from 2 equivalents of pyridine derivative 1 and one equivalent of disulfide reagent comprising two leaving groups Gp, to lead to dipyridinium disulfide salt 3 which can be condensed in turn with two equivalents of compound f to yield 5. Gpù (CH2) Ta + ù (CH2) n I Rh Rh2 R h \ ~ ch Gpù (CH2) m T + (CH2), SR h` h + Gp-iT + SùS ## STR1 ## wherein Gp represents a leaving group, such as, for example, mesylate, tosylate, triflate or halide. The counter ions Gp- of the compounds 5, above may be replaced by counterions M 'of other types from methods known to those skilled in the art including ion exchange resin.

  Reference may be made to Advanced Organic Chemistry, Reactions, Mechanisms and Structures, J. March, 4th Ed, John Willey & Sons, 1992 or TW Greene Protective Groups in Organic Synthesis, for further details on operating conditions. for the processes mentioned above.

  The thiol fluorescent dyes formed can be converted to Y-protected thiols fluorescent dyes by the protection of thiols using conventional protecting groups. The thiol fluorescent dyes are metallated using also conventional methods known to those skilled in the art such as those described in Advanced Organic Chemistry, Reactions, Mechanisms and Structures, J. March, 4th Ed, John Willey & Sons, NY, 1992. Protected thiol dyes may be deprotected by conventional routes such as those described in Protective Groups in Organic Synthesis, TW Greene, John Willey & Sons ed., NY, 1981; Protecting Groups, P. Kocienski, Thieme, 3rd ed., 2005.

  The composition of the invention contains at least one thiol fluorescent dye of formula (I). In addition to the presence of at least one fluorescent dye of formula (I), the composition of the invention may also contain a reducing agent. This reducing agent may be chosen from thiols, for example cysteine, homocysteine, thiolactic acid, the salts of these thiols, phosphines, bisulfite, sulphites, thioglycolic acid and its esters. , especially glycerol monothioglycolate, and thioglycerol. This reducing agent may also be chosen from borohydrides and their derivatives, such as, for example, borohydride, cyanoborohydride, triacetoxyborohydride or trimethoxyborohydride salts: sodium, lithium, potassium, calcium, quaternary ammonium salts (tetramethylammonium, tetraethylammonium, tetra butylammonium, benzyltriethylammonium); catecholborane.

  The dye composition useful in the invention generally contains a quantity of thiol fluorescent dye of formula (I) of between 0.001 and 50% relative to the total weight of the composition. Preferably, this amount is between 0.005 and 20% by weight and even more preferably between 0.01 and 5% by weight relative to the total weight of the composition.

  The dye composition may further contain additional direct dyes. These direct dyes are, for example, chosen from neutral, acidic or cationic nitro-benzene direct dyes, neutral azo, acid or cationic direct dyes, tetraazapentamethine dyes, neutral or acidic or cationic quinone dyes, in particular neutral anthraquinone dyes and direct azine dyes. , triarylmethane direct dyes, indoamine direct dyes and natural direct dyes. Among the natural direct dyes that may be mentioned are lawsone, juglone, alizarin, purpurin, carminic acid, kermesic acid, purpurogalline, protocatechaldehyde, indigo, isatin, curcumin, spinulosin, apigenidine. It is also possible to use the extracts or decoctions containing these natural dyes, and in particular poultices or extracts made from henna. The dye composition may contain one or more oxidation bases and / or one or more couplers conventionally used for dyeing keratinous fibers.

  Among the oxidation bases, mention may be made of para-phenylenediamines, bis-phenylalkylenediamines, para-aminophenols, bis-para-aminophenols, ortho-aminophenols, heterocyclic bases and their addition salts. Among these couplers, there may be mentioned meta-phenylenediamines, meta-aminophenols, meta-diphenols, naphthalenic couplers, heterocyclic couplers and their addition salts. The coupler or couplers are each generally present in an amount of between 0.001 and 10% by weight of the total weight of the dye composition, preferably between 0.005 and 6%. The oxidation base (s) present in the dyeing composition are in general each present in an amount of between 0.001% and 10% by weight relative to the total weight of the dyeing composition, preferably between 0.005% and 6% by weight.

  In general, the addition salts of the oxidation bases and couplers that can be used in the context of the invention are chosen especially from the addition salts with an acid such as hydrochlorides, hydrobromides, sulphates, citrates, succinates, tartrates, lactates, tosylates, benzenesulfonates, phosphates and acetates and addition salts with a base such as alkali metal hydroxides such as sodium hydroxide, potassium hydroxide, ammonia, amines or alkanolamines. The medium suitable for dyeing, also called dyeing medium, is a cosmetic medium generally consisting of water or a mixture of water and at least one organic solvent. As organic solvent, there may be mentioned for example lower alkanols C1-C4, such as ethanol and isopropanol; polyols and polyol ethers such as 2-butoxyethanol, propylene glycol, propylene glycol monomethyl ether, diethylene glycol monoethyl ether and monomethyl ether, as well as aromatic alcohols such as benzyl alcohol or phenoxyethanol, and mixtures thereof.

  The solvents when present are preferably present in proportions preferably of between 1 and 40% by weight approximately relative to the total weight of the dye composition, and even more preferably between 5 and 30% by weight approximately. According to one variant, the invention contains a reducing agent capable of reducing the disulfide bonds of keratin. This reducing agent is as defined above. The dye composition may also contain various adjuvants conventionally used in compositions for dyeing hair, such as anionic, cationic, nonionic, amphoteric, zwitterionic surfactants or mixtures thereof, anionic, cationic, nonionic, amphoteric and zwitterionic polymers. or mixtures thereof, inorganic or organic thickeners, and in particular anionic, cationic, nonionic and amphoteric polymeric associative thickeners, antioxidants, penetrating agents, sequestering agents, perfumes, buffers, dispersing agents, conditioning agents such as, for example, volatile or non-volatile silicones, modified or otherwise, such as aminosilicones, film-forming agents, ceramides, preserving agents, opacifying agents, conductive polymers.

  The adjuvants above are generally present in an amount for each of them between 0.01 and 20% by weight relative to the weight of the composition. Of course, one skilled in the art will take care to choose this or these optional additional compounds in such a way that the advantageous properties intrinsically attached to the dyeing composition according to the invention are not, or not substantially, impaired by the or the additions envisaged. The pH of the dyeing composition is generally between 3 and 14 approximately, and preferably between 5 and 11 approximately. It can be adjusted to the desired value by means of acidifying or alkalizing agents usually used for dyeing keratin fibers or else using conventional buffer systems. Among the acidifying agents, mention may be made, by way of example, of mineral or organic acids such as hydrochloric acid, orthophosphoric acid, sulfuric acid, carboxylic acids such as acetic acid, tartaric acid, citric acid, lactic acid, sulphonic acids.

  Among the alkalinizing agents that may be mentioned, by way of example, are ammonia, alkaline carbonates, alkanolamines such as mono-, di- and triethanolamines and their derivatives, sodium or potassium hydroxides and following formula (y): R 1 / Rat / N Wa N Ra 4 R 1 (Y) in which Wa is a propylene residue optionally substituted with a hydroxyl group or a C 1 -C 4 alkyl radical; Ra1, Ra2, Ra3 and Ra4, which may be identical or different, represent a hydrogen atom, a C1-C4 alkyl radical or a C1-C4 hydroxyalkyl radical. The dye composition may be in various forms, such as in the form of liquid, cream, gel, or in any other form suitable for dyeing keratinous fibers, and in particular hair.

  According to a particular embodiment in the process of the invention, a reducing agent may be applied pre-treatment before application of the composition containing at least one heterocyclic thiol fluorescent dye of formula (I). This reducing agent may be chosen from thiols, for example cysteine, homocysteine, thiolactic acid, the salts of these thiols, phosphines, bisulfite, sulphites, thioglycolic acid and its esters, especially the glycerol monothioglycolate, and thioglycerol. This reducing agent may also be chosen from borohydrides and their derivatives, such as, for example, borohydride, cyanoborohydride, triacetoxyborohydride or trimethoxyborohydride salts: sodium, lithium, potassium, calcium, quaternary ammonium salts (tetramethylammonium, tetraethylammonium, tetra butylammonium, benzyltriethylammonium); catecholborane. This pretreatment may be of short duration, in particular from 0.1 second to 30 minutes, preferably from 1 minute to 15 minutes with a reducing agent as mentioned above. According to another method, the composition comprising at least one thiol fluorescent dye of formula (I) also contains at least one reducing agent as defined above. This composition is then applied to the hair. When the thiol fluorescent dye of formula (I) comprises a group Y protecting the thiol function, the process of the invention may be preceded by a deprotection step aimed at rendering the SH function in situ.

  By way of example, it is possible to deprotect the SY function with the protective group by adjusting the pH as follows: Y: alkylcarbonyl deprotection protecting group, pH> 9 arylcarbonyl, pH> 9 alkoxycarbonyl, pH> 9 aryloxycarbonyl, pH> 9 arylalkoxycarbonyl pH> 9 (di) (alkyl) aminocarbonyl, pH> 9 (alkyl) arylaminocarbonyl pH> 9 aryl optionally substituted such pH> 9 as phenyl, monocyclic heteroaryl with 5, 6 or 7 pH> 9 members such as oxazolium; 8 to 11-membered bicyclic heteroaryl pH> 9-membered such as benzoimidazolium, or benzoxazolium The deprotection step may also be carried out in the course of a hair pretreatment step such as, for example, hair reduction pretreatment.

  According to one variant, the reducing agent is added to the dyeing composition containing at least one thiol fluorescent dye of formula (I) at the time of use. According to another method, the composition comprising at least one thiol fluorescent dye of formula (I) also contains at least one reducing agent as defined above. This composition is then applied to the hair. According to another variant, the reducing agent is applied in post-treatment, after the application of the composition containing at least one thiol fluorescent dye (I). The duration of the post-treatment with the reducing agent can be short, for example from 0.1 second to 30 minutes, preferably from 1 minute to 15 minutes, with a reducing agent as described above. According to a particular embodiment, the reducing agent is a thiol or borohydride type agent as described above. A particular embodiment of the invention relates to a method in which the thiol fluorescent dye can be applied directly to hair without reducing agents, free of pre- or post-treatment reducers. A treatment with an oxidizing agent may optionally be associated. Any type of conventional oxidizing agent may be used in the art. Thus, it may be chosen from hydrogen peroxide, urea peroxide, alkali metal bromates, persalts such as perborates and persulphates, as well as the enzymes among which may be mentioned peroxidases, oxides, 2-electron reductases such as uricases and 4-electron oxygenases such as laccases. The use of hydrogen peroxide is particularly preferred. This oxidizing agent may be applied to the fibers before or after the application of the composition containing at least one thiol fluorescent dye of formula (I). The application of the dye composition according to the invention is generally carried out at room temperature. It can however be carried out at temperatures ranging from 20 to 180 C.

  The invention also relates to a multi-compartment device or "kit" of dyeing in which a first compartment contains a dye composition comprising at least one thiol fluorescent dye of formula (I) and a second compartment contains a reducing agent capable of reducing the disulfide functions of keratin materials. One of these compartments may further contain one or more other dyes of direct dye type or oxidation dye. It also relates to a multi-compartment device in which a first compartment contains a dye composition comprising at least one thiol fluorescent dye of formula (I); a second compartment contains a reducing agent capable of reducing the disulfide bond of the keratin materials; a third compartment contains an oxidizing agent.

  Alternatively, the dyeing device contains a first compartment containing a dye composition which comprises at least one protected thiol fluorescent dye of formula (I) and a second compartment containing an agent capable of deprotecting the protected thiol to release the thiol.

  Each of the above-mentioned devices may be equipped with means for delivering the desired mixture onto the hair, for example such as the devices described in patent FR 2 586 913. The following examples serve to illustrate the invention without however to be limiting in nature. The thiol fluorescent dyes of the examples below have been fully characterized by conventional spectroscopic and spectrometric methods. EXAMPLES

  SYNTHESIS EXAMPLE Synthesis of 2 - {(E) -2- [4- (dimethylamino) phenyl] vinyl} -1- {4- [dimethyl (2-sulfanylethyl) ammonio] butyl} pyridinium dibromide [1] N \ N [1] Synthesis Scheme BrBr AcOiPr / ùN \ NaOH 1N Br NMP 4 Br O \ / N \ AcOH \ / SS \ ~ / N \ \ N / 4 Br HO O HO H2O EtOH \ N / HO OH [1] HO Procedure Step 1: Synthesis of 1- (4-bromobutyl) -2-methylpyridinium bromide

  12.5 ml of 2-picoline diluted in 50 ml of isopropyl acetate are added dropwise to 106 ml of 1,4-dibromobutane and 100 ml of isopropyl acetate (AcOiPr). The reaction medium is refluxed for 12 hours. 200 ml of ethyl acetate are added to the reaction mixture previously cooled to room temperature, the precipitate obtained is filtered and then dried. The powder obtained is solubilized with 100 ml of water and extracted with butanol. The butanol phase is concentrated, then 100 ml of ethyl acetate are added to the residue, the precipitate obtained is filtered and then dried. 20.9 g of brown powder are collected. The analyzes indicate that the product is compliant and pure.

  Step 2: Synthesis of 1,1 '- {disulfanediylbis [ethane-2,1-diyl- (dimethylammonio) butane-4,1-diyl]} bis (2-methylpyridinium) tetrabromide

  To 11.16 g of tetramethyl cystamine dihydrochloride solubilized in 50 ml of water are added 80 ml of 1N sodium hydroxide (NaOH). The mixture is concentrated to dryness. The residue is suspended in 150 mL of dichloromethane. The precipitate obtained is filtered.

  The filtrate is concentrated to dryness. The oil obtained is concentrated after adding 3 times 50 ml of toluene. 8.3 g of tetramethyl cystamine are collected. 3.51 g of diluted tetramethyl cystamine and 10.9 g of 1- (4-bromobutyl) -2-methylpyridinium bromide are mixed in 50 ml of N-methylpyrrolidinone (NMP) with stirring at 80 ° C. for 48 h. The heating is stopped; the resulting gum is isolated and the supernatant is removed. The gum is solubilized in 150 ml of isopropanol with stirring at 80 ° C. After cooling, the precipitate obtained is filtered, washed with 3 times 50 ml of isopropanol and then dried under vacuum under P2O5. 9.6 g of white powder are collected. The analyzes indicate that the product is compliant.

  Step 3: Synthesis of 1,1 '- {disulfanediylbis [ethane-2,1-diyl- (dimethylammonio) butane-4,1-diyl]} bis (2 - {(E) -2- [4- ( dimethylamino) phenyl] -vinyl} pyridinium) [la]

  0.36 g of 4-dimethylamino-benzaldehyde dissolved in 2 ml of isopropanol and 250 μl of pyrrolidine are stirred for 10 minutes at room temperature and then for 20 minutes after the addition of 143 μl of acetic acid. 1 g of 1,1 '- {disulfanediylbis [ethane-2,1-diyl (dimethylammonio) butane-4,1-diyl]} bis (2-methylpyridinium) tetrabromide in suspension in 2 ml of isopropanol are added to the medium. reaction, then maintained stirring at room temperature for 48h. 50 ml of ethyl acetate are added to the mixture, the precipitate obtained is filtered, washed with 150 ml of ethyl acetate and then dried. 1.08 g of orange powder is collected. The analyzes indicate that the product is compliant. 1 H NMR (400 MHz, MeOH-d4) 2.08 (m, 8H), 3.04 (s, 12H), 3.23 (s, 12H), 3.44 (m, 4H), 3.62 (m, 4H), 3.77 (m, 4H), 4.82 (m, 4H), 6.72 (d, 4H), 7.23 (d, 2H), 7.61 (t, 2H), 7.76 (d, 4H), 7.79 ( d, 2H), 8.23 (t, 2H), 8.30 (d, 2H), 8.76 (d, 2H).

Step 4: Synthesis of 2 - {(E) -2- [4- (dimethylamino) phenyl] vinyl} -1- {4- [dimethyl (2-sulfanylethyl) ammonio] butyl} pyridinium salt [1] 110 mg compound [la] are dissolved in 10 mL of water / ethanol mixture (v / v 1/1); 60 mg (2 eq) of 3- [bis (2-carboxyethyl) phosphino] propanoic acid hydrochloride hydrate in solution in 1 mL water and 21 mg (4 eq) sodium bicarbonate solution in 1 mL of water are added to the mixture. After stirring for 30 minutes at 40 ° C. under an inert atmosphere, the analyzes indicate that the mixture contains most of the expected product [1].

  LC-MS analysis: LC-DAD (400-700 nm) Column: Waters XTerra MS C18 5pm (4.6 x 50) mm Mobile phase: A: Water + formic acid 0.1% / B: acetonitrile Linear gradient: T (min) A % / B%: 0 min 95/5; 8 min 0/100 Flow rate: 1 mL / min. Detection: UV diode array at = 400-700nm

Retention time t = 3.2 min.

  Relative purity> 95% MS (ESI +) m / z = 193 corresponds to the mass peak of the expected product dication [1] HRMS (ESI +) m / z = 192.6270 (12C23H3514N332S1 Arnim: - 0.09 ppm) EXAMPLE OF COLORING Process 10 mL of fresh solution of the compound [1] of the synthetic example are applied to a lock of 1 g of hair of pitch 4 arranged at the bottom of the same bowl for 30 minutes at room temperature (the locks are returned and re-impregnated after 15 minutes). The locks are then rinsed with running water and dried. After staining, the pitch lock 4 became visually brighter than untreated control locks.

  Remanence vis-à-vis successive shampoos:

  The locks thus treated are divided in two, one half is subjected to 5 successive shampoos in a cycle which comprises wetting the locks with water, washing with a conventional shampoo, rinsing with water followed by drying.

  Visual observations During shampoos, there is no visible bleeding, shampoo foam and rinsing water are not colored The color observed on the locks is preserved and the lightening effect remains visible on the hair as well treaties 34

Claims (21)

  1. Fluorescent dye of formula (I) below: G its organic or inorganic acid salts, optical isomers, geometric isomers, and solvates such as hydrates; formula (I) in which: - G represents an optionally substituted -NRCRd or C1-C6 alkoxy group; - R, and Rd identical or different, represent a hydrogen atom, an aryl (C 1 -C 4) alkyl group, or an (C 1 -C 6) alkyl optionally substituted group; - Rg, R'g, Rh and R'h, identical or different, represent a hydrogen atom, halogen, an amino group, (di) (C 1 -C 4) alkylamino, cyano, carboxy, hydroxy, trifluoromethyl , (C 1 -C 4) alkoxycarbonyl, (C 1 -C 4) alkylcarbonyloxy, (C 1 -C 4) alkoxycarbonyl, (C 1 -C 4) alkylcarbonylamino, acylamino, carbamoyl, (C 1 -C 4) alkylsulfonylamino, (C 1 -C 4) alkoxy, an amino-sulphonyl radical, or a (C 1 -C 16) alkyl radical optionally substituted with a group chosen from (C 1 -C 12) alkoxy, hydroxy, cyano, carboxy, amino, (di) (C 1 -C 4) alkylamino; -R '; and R ", which may be identical or different, represent a hydrogen atom, or a (C 1 -C 4) alkyl group; Ta represents a: ## STR1 ## or with R and R, identical or different, representing a hydrogen atom, a C1-C4 alkyl radical, a C1-C4 hydroxyalkyl radical or a (C1-C4) alkyl radical, or • a heterocycloalkyl or heteroaryl radical, cationic, - m and n, which are identical; or different, represent an integer inclusive inclusive M ', ùTa / SY `(CH2) m (CH2) n (I) between 0 and 6 with m + n represents an integer inclusive between 1 and 10; anionic ion, and Y represents: i) a hydrogen atom, ii) an alkali metal, iii) an alkaline earth metal, iv) an ammonium group: N + RaRRRYR8 or a phosphonium group: P + RaRRRYR8 with Ra , RR, R7 and R8, which may be identical or different, representing a hydrogen atom or a (C 1 -C 4) alkyl group, or v) a protective thiol group; understood that: -when the compound of formula (I) contains other cationic parts, it is associated with one or more anionic counter-ions making it possible to reach the electroneutrality of formula (I).   2. Fluorescent dye of formula (I) according to the preceding claim wherein Y represents a hydrogen atom, or an alkali metal.   3. Fluorescent dye of formula (I) according to claim 1 wherein Y represents a protective group.   4. Fluorescent dye of formula (I) according to the preceding claim wherein Y represents a protective group selected from the following radicals: - (C1-C4) alkylcarbonyl; - (C1-C4) alkylthiocarbonyl; - (C1-C4) alkoxycarbonyl; - (C1-C4) alkoxy-iocarbonyl; - (C1-C4) alkylthiothiocarbonyl; - (di) (C1-C4) (alkyl) aminocarbonyl; - (di) (C1-C4) (alkyl) aminothiocarbonyl; arylcarbonyl; -aryloxycarbonyl; aryl (C1-C4) alkoxycarbonyl; - (di) (C1-C4) (alkyl) aminocarbonyl; - (C1-C4) (alkyl) arylaminocarbonyl; carboxy; -SO3; M + with M + representing an alkali metal or M + and M 'of the formula (I) are absent, - optionally substituted aryl, - optionally substituted heteroaryl; optionally substituted heterocycloalkyl, optionally cationic; isothiouronium -C (NR 'R'd) = N + R'eR'f; With R ', R'd, R'e and R'f, identical or different, represent a hydrogen atom or an alkyl group; and An- represents an anionic counterion; isothiourea -C (NR 'R'd) = NR'e with R', R'd, R'e, as defined previously; - (di) arylalkyl optionally substituted; optionally substituted (di) heteroarylalkyl; - CR'1R'2R'3 with R'1, R'2 and R'3 identical or different, representing a halogen atom or a group selected from: alkyl; alkoxy; optionally substituted aryl; optionally substituted heteroaryl; - P (Z ') R "1R" 2R "3 with R" 1, and R "2 identical or different represent a hydroxyl, alkoxy or alkyl group, R" 3 represents a hydroxyl or alkoxy group, and Z' represents an atom oxygen or sulfur; cyclic sterically hindered such as the adamantyl group; and optionally substituted (C1-C4) alkoxyalkyl.   A fluorescent dye according to any one of the preceding claims wherein Y represents an alkali metal or a protecting group selected from: - (C1-C4) alkylcarbonyl; arylcarbonyl; - (C1-C4) alkoxycarbonyl; aryloxycarbonyl; aryl (C1-C4) alkoxycarbonyl; - (di) (C1-C4) (alkyl) aminocarbonyl; - (C1-C4) (alkyl) arylaminocarbonyl; optionally substituted aryl; monocyclic 5- or 6-membered heteroaryl; 8 to 11-membered cationic bicyclic heteroaryl; - Cationic heterocycle of the following formula: 5 Me An - isothiouronium -C (NH 2) = N + H 2; An; - isothiourea -C (NH 2) = NH; and - S03; M +   6. Heterocyclic thiol fluorescent dye according to any one of the preceding claims, of the following formula: ## STR1 ## ~ N \ NJ N- ~ N. ~~ SH 2M 3 4 3M 'Nù N J S N ~ ùo N = SH / N \ ùo O / O Where 2M 2M' 6 \ N- ~ N N S \\ \ ù / o where 2M 'where. 7With M ', identical or different, representing an anionic counterion.   7. Dyeing composition comprising in a suitable cosmetic medium, a thiol fluorescent dye of formula (I) as defined in any one of claims 1 to 6.   8. dye composition comprising in a suitable cosmetic medium, at least one thiol fluorescent dye of formula (I) as defined in any one of claims 1 to 6 and at least one reducing agent.   9. Dyeing composition according to the preceding claim wherein the reducing agent is chosen from: cysteine, homocysteine, thiolactic acid, the salts of these thiols, phosphines, bisulfite, sulfites, thioglycolic acid, as well as its esters, borohydrides and their derivatives, the sodium, lithium, potassium, calcium and quaternary ammonium salts; catecholborane.   10. Composition according to any one of claims 7 to 9, wherein the thiol fluorescent dye of formula (I) is present in an amount of between 0.001 and 50% by weight relative to the total weight of the composition.   11. A method for dyeing keratinous materials, wherein is applied to the materials, a dye composition as defined in any one of claims 7 to 10, comprising in a suitable cosmetic medium, at least one thiol fluorescent dye of formula (I) as defined in any one of claims 1 to 6, optionally in the presence of a reducing agent capable of reducing the disulfide bonds of the keratin materials.   12. The method of dyeing according to the preceding claim wherein when the thiol fluorescent dye of formula (I) comprises a protective Y group, the application is preceded by a deprotection step.   13. A method of dyeing keratin materials according to any one of claims 11 or 12 characterized in that the keratin materials are dark keratinous fibers having a pitch of less than or equal to 6.   The method of any one of claims 11 to 13 wherein the reducing agent is applied before or after the application of the thiol fluorescent dye.   The process of any one of claims 11 to 14, wherein the composition comprises an oxidizing agent.   16. A method according to any one of claims 11 to 15 comprising a further step of applying to the keratin fibers an oxidizing agent.   17. A multi-compartment device in which a first compartment contains a dye composition comprising a thiol fluorescent dye as defined in claims 1 to 6 and a second compartment contains a reducing agent capable of reducing the disulfide bonds of keratin materials.   18. Device according to the preceding claim comprising a third compartment which contains an oxidizing agent.   19. Use of fluorescent dyes thiols as defined in claims 1 to 7 for dyeing dark human keratin fibers.   20. Use according to the preceding claim for lightening dark keratin fibers. 25   21. Use according to claims 19 or 20 characterized in that the keratinous fibers have a pitch of less than 6. 15