Patent ID: 7276086

Claim:
A composition for treating human keratin fibers comprising: an appropriate medium for treating human keratin fibers, wherein said medium is water or a mixture of water and at least one organic solvent and, at least one compound comprised in said medium, wherein said compound is chosen from pyrazine derivatives of formula (I) and addition salts thereof with an acid or with an alkaline agent: wherein: R 1 and R 2 , which may be identical or different, are each chosen from a hydrogen atom, a cyano radical, a hydroxyl radical, alkyl radicals, alkenyl radicals, alkoxy radicals, halogen atoms, amino radicals, radicals NRaRb, COOX radicals, or form, together with the two carbon atoms of the pyrazine ring carrying them, a mono- or polycyclic heterocycle comprising at least one heteroatom which is optionally substituted with at least one entity chosen from alkyl radicals, aryl radicals, cyano radicals, halogen atoms, amino radicals, and radicals NRcRd; R 3 and R 4 , which may be identical or different, are each chosen from a hydroxyl radical, a cyano radical, halogen atoms, amino radicals, radicals NReRf, COOX radicals, alkyl radicals, alkenyl radicals, alkoxy radicals, or form, together with the two carbon atoms of the pyrazine ring carrying them, a mono- or polycyclic heterocycle comprising at least one heteroatom which is optionally substituted with at least one entity chosen from alkyl radicals, aryl radicals, cyano radicals, halogen atoms, amino radicals, and radicals NRgRh, it being possible for the alkyl, alkoxy and alkenyl radicals of R 1 , R 2 , R 3 , and R 4 to be substituted with at least one entity chosen from hydroxyl radicals, amino radicals, aryl radicals, and monocyclic and fused heterocycles; X is chosen from a hydrogen atom, alkyl radicals, and ions derived from an alkali, alkaline-earth metal, organic amine, or ammonium ions; and Ra, Rb, Rc, Rd, Re, Rf, Rg and Rh, which may be identical or different, are each chosen from alkyl and aryl radicals, or form, with the nitrogen atom carrying them, a 5- or 6-membered heterocycle which may comprise at least one heteroatom, and which may be substituted with at least one entity chosen from alkyl radicals, aryl radicals, and halogen atoms.