New secondary intermediates, processes for their production...

C - Chemistry – Metallurgy – 07 – D

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C07D 317/22 (2006.01) C07D 317/28 (2006.01) A61K 7/13 (1995.01)

Patent

CA 2232415

The invention concerns compounds of general formula (I) and their salts with inorganic and organic acids, in which R1, R2, R3 and R4, independently of each other, are a hydrogen atom, a C1-C4 alkyl group, a hydroxy C2-C3 alkyl group, an alkoxy C2-C3 alkyl group, an amino C2-C3 alkyl group, a 2,3-dihydroxypropyl group, and R5 and R6, independently of each other, can designate hydrogen or a C1-C4 alkyl group. The invention further concerns processes for preparing these compounds and hair dyes, in particular hair dyes based on the compounds of general formula (I) in the form of a cream, solution, foam or gel, which contain at least one compound of general formula (I) alone or with at least one developer, and an oxidation catalyst for forming an oxidation dye using atmospheric oxygen. The oxidation catalyst consists of a transition metal salt or transition metal complex, in particular cupric chloride, sulphate or acetate, alone or as an addition compound with ammonia, ethylene diamine, phenanthroline, triphenylphosphine, 1,2-diphenylphosphinoethane, 1,3- diphenylphosphinopropane or amino acids alone or in a mixture. The resultant hair-dyeing process is particularly kind to the hair.

L'invention concerne des composés de la formule générale (I) ainsi que leurs sels comportant des acides inorganiques et organiques. Dans la formule (I), R?1¿, R?2¿, R?3¿ et R?4¿ représentent indépendamment les uns des autres un atome d'hydrogène, un groupe alkyle (C¿1?-C¿4?), un groupe hydroxy-alkyle (C¿2?-C¿3?), un groupe alcoxy-alkyle (C¿2?-C¿3?), un groupe amino-alkyle (C¿2?-C¿3?), un groupe 2,3-dihydroxypropyle et R?5¿ comme R?6¿ peuvent représenter indépendamment l'un de l'autre de l'hydrogène ou un groupe alkyle (C¿1?-C¿4?). L'invention concerne également un procédé de production de ces substances et des teintures capillaires, en particulier des teintures à base de composés de la formule générale (I) sous forme de crème, de solution, de mousse et de gels qui contiennent au moins un composé de la formule générale (I) seul ou avec au moins un agent de développement, et un catalyseur d'oxydation pour la formation d'une coloration d'oxydation par l'oxygène de l'air. Le catalyseur d'oxydation est constitué d'un sel de métal de transition ou d'un complexe de métal de transition, notamment du chlorure, du sulfate ou de l'acétate de cuivre (II) seuls ou comme produit d'addition avec de l'ammoniac, de l'éthylènediamine, de la phénanthroline, de la triphénylphosphine, 1,2-diphénylphosphinoéthane, 1,3-diphénylphosphinopropane ou des acides aminés seuls ou en mélange. Le procédé de teinture capillaire résultant est particulièrement doux pour les cheveux.

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