A composition for the oxidation dyeing of keratinous fibers, wherein said composition comprises, in a medium suitable for dyeing:
- as oxidation base, at least one pyrazoloazole compound of formula (I) or at least one acid addition salt thereof:
- 14
- in which:
- R1 represents:
- a hydrogen atom;
- a linear or branched C1-C20 alkyl radical, optionally substituted by 1 or 2 radicals R chosen from a halogen atom, a nitro radical, a cyano radical, a hydroxyl radical, an alkoxy radical, an aryloxy radical, an amino radical, an alkylamino radical, an acylamino radical, a carbamoyl radical, a sulphonamido radical, a sulphamoyl radical, an imido radical, an alkylthio radical, an arylthio radical, an aryl radical, a (C1-C4)alkoxy-carbonyl radical and an acyl radical;
- an aryl radical optionally substituted by 1 or 2 radicals R as defined above;
- a 5- or 6-membered heterocycle containing at least one nitrogen, oxygen or sulphur atom wherein said heterocycle is optionally substituted by 1 or 2 radicals R as defined above;
- when R1 denotes a C1-C4 alkyl radical, an aryl radical or a 5- or 6-membered heterocycle, it can be connected to the carbon atom of the pyrazole via an oxygen, nitrogen or sulphur atom;
- R1 can, additionally, denote a halogen atom;
- an acyl radical;
- a sulphonyl radical;
- a sulphinyl radical;
- a phosphonyl radical;
- a carbamoyl radical;
- a sulphamoyl radical;
- a cyano radical;
- a siloxy radical;
- an amino radical;
- an acylamino radical;
- an acyloxy radical;
- a carbamoyloxy radical;
- a sulphonamide radical;
- an imide radical;
- a ureido radical;
- a sulphamoylamino radical;
- a (C1-C4)alkoxy-carbonylamino radical;
- an aryloxycarbonylamino radical;
- a (C1-C4)alkoxy-carbonyl radical;
- an aryloxycarbonyl radical;
- a carboxyl radical;
- or a hydroxyl radical;
- R2 is a hydrogen atom;
- a C1-C4 alkyl radical;
- a C1-C4 monohydroxyalkyl radical;
- a C2-C4 polyhydroxyalkyl radical;
- a C1-C4 aminoalkyl radical;
- a (CH2)p—X—(CH2)qOR′ radical in which p and q are identical or different integers ranging from 1 to 3, R′ represents a hydrogen atom or a methyl radical, and X denotes an oxygen atom or an NR″ group in which R″ represents a hydrogen atom or a methyl radical;
- a (C1-C4)alkoxy(C2-C4)alkyl radical;
- or a di(C1-C4)alkylamino(C1-C4)alkyl radical;
- Za, Zb and Zc represent, independently of one another, a nitrogen atom or a carbon atom carrying an R3 or R4 radical, where R3 and R4 independently have the same meanings as those indicated above for R1, with the proviso that at least one of the Za, Zb and Zc radicals is other than a carbon atom;
- R3 and R4 can also together form a substituted or unsubstituted aromatic ring, such as a phenyl ring.