Dye composition comprising a 1,2,3,4-tetrahydropyrido[2,3-b]pyrazin-7-amine compound

Abstract

The invention relates to a 1,2,3,4-tetrahydropyrido[2,3-b]pyrazin-7-amine compound of formula (I) below, addition salts thereof, optical isomers, geometrical isomers and tautomers thereof and/or solvates thereof: in which: .R, R, R, R, and Rindependently represent: a hydrogen or halogen atom; a C-Calkyl radical; a C-Chydroxyalkyl radical; a carboxyl radical; a (C-C)alkoxycarbonyl radical; .R1 and R6, which may be identical or different, represent: hydrogen atom; C-Cand preferably Ci-C6 alkyl radical,—optionally interrupted with one or more heteroatoms chosen from O and S or with one or more groups—NR and/or—optionally terminating with at least one group—NXXor at least one group —OX, .Xand X2 independently denote—a hydrogen atom, a linear C-Calkyl radical, a branched C-Calkyl radical, a linear C-Chydroxyalkyl radical or a branched C-Chydroxyalkyl radical, X1 and X2 may form, with the nitrogen atom that bears them, a saturated or unsaturated 5- to 8-membered heterocycle, in which one of the ring members may be a heteroatom chosen from O, S and N; the said heterocycle possibly being substituted with one or more linear or branched C-Calkyl or C-Chydroxyalkyl radicals, .X3 denotes—a hydrogen atom—a linear C1-C4 or branched C3-C4 alkyl radical, and .R denotes—a hydrogen atom—a linear C1-C4 alkyl radical.