Method of coloring keratinous fibers comprising application of at least one aminopyrazolopyridine oxidation base in the absence of chemical oxidizing agents

A method for coloring keratinous fibers comprising applying to the fibers a composition comprising, in a medium appropriate for dyeing, at least one aminopyrazolopyridine oxidation base chosen from compounds of formula (I) and compounds of formula (II):

• wherein:
• R1, R2, R3, R4 and R5, are, independently of one another, chosen from hydrogen atoms;
• halogen atoms;
• —NHSO3H radicals;
• hydroxyl radicals;
• (C1-C4)alkyl radicals;
• (C1-C4)alkoxy radicals;
• (C1-C4)alkylthio radicals;
• mono(C1-C4)alkylamino radicals;
• di(C1-C4)alkylamino radicals wherein the two alkyl groups can optionally, jointly with the nitrogen atom to which they are bonded, form a ring which can be interrupted by at least one heteroatom chosen from nitrogen, oxygen, and sulfur atoms;
• heterocycles;
• nitro radicals;
• phenyl radicals, carbonyl radicals;
• (C1-C4)alkoxycarbonyl radicals;
• carboxamido radicals;
• cyano radicals;
• amino radicals;
• sulfonyl radicals;
• —CO2H radicals;
• —SO3H radicals;
• —PO3H2 radicals;
• —PO4H2 radicals;
• groups of formula:
• wherein R′″ is chosen from oxygen atoms and nitrogen atoms, Q is chosen from oxygen atoms, NH groups, and NH(C1-C4)alkyl groups, and Y is chosen from hydroxyl, amino, (C1-C4)alkyl, (C1-C4)alkoxy, (C1-C4)alkylamino, and di(C1-C4)alkylamino radicals;
• wherein:
• R′1 and R′2 are, independently of each other, chosen from:
• hydrogen atoms,
• optionally substituted (C1-C10)alkyl radicals, optionally interrupted by at least one heteroatom chosen from O, N, Si, and S, and optionally interrupted by at least one group chosen from SO and SO2,
• halogen atoms,
• SO3H radicals,
• substituted and unsubstituted, saturated, unsaturated, and aromatic 5- to 8-membered rings, optionally comprising at least one heteroatom chosen from N, O, and S, and optionally comprising at least one group chosen from SO2 and —CO—, it being understood that the ring may optionally be cationic and/or substituted by a cationic radical,
• —N+R17R18R19 groups, wherein R17, R18, and R19 are, independently of one another, chosen from linear and branched (C1-C5)alkyls, optionally substituted by at least one hydroxyl group,
• Z1 and Z2 are, independently of one another, chosen from:
• simple covalent bonds,
• divalent radicals chosen from:
• —O(CH2)p— radicals, wherein p is an integer ranging from 0 to 6,
• —NR′6(CH2)q(C6H4)t— radicals, wherein q is an integer ranging from 0 to 6, t is chosen from 0 and 1, and R′6 is chosen from hydrogen atoms and (C1-C6)alkyl radicals optionally substituted by at least one hydroxyl group,
• when R′1 is a methyl radical, Z1 can also be chosen from divalent —S—, —SO—, and —SO2— radicals,
• when Z1 is a covalent bond, R′1 can also be chosen from:
• optionally substituted (C1-C6)alkylcarbonyl radicals,
• —O—CO—R, —CO—O—R, —NR—CO—R′, and —CO—NRR′ radicals, wherein R and R′ are, independently of one another, chosen from hydrogen atoms and optionally substituted (C1-C6)alkyl radicals,
• when Z2 is a covalent bond, R′2 can also be chosen from:
• optionally substituted (C1-C6)alkylcarbonyl radicals,
• —O—CO—R, —CO—O—R, —NR—CO—R′, and —CO—NRR′ radicals, wherein R and R′ are, independently of one another, chosen from hydrogen atoms and optionally substituted (C1-C6)alkyl radicals,
• R′3, R′4, and R′5, are, independently of one another, chosen from:
• hydrogen atoms,
• hydroxyl radicals,
• (C1-C6)alkoxy radicals,
• (C1-C6)alkylthio radicals,
• amino radicals,
• monoalkylamino radicals,
• (C1-C6)dialkylamino radicals in which the alkyl radicals can form, with the nitrogen atom to which they are attached, a saturated or unsaturated, aromatic or non-aromatic, 5- to 8-membered heterocycle which can comprise at least one heteroatom chosen from N, O, and S, and at least one groups chosen from SO2 and CO, it being understood that the heterocycle may optionally be cationic and/or substituted by a cationic radical,
• optionally substituted (C1-C6)alkylcarbonyl radicals,
• —O—CO—R, —CO—O—R, —NR—CO—R′ and —CO—NRR′ radicals, wherein R and R′ are as defined above,
• halogen atoms, —
• —NHSO3H radicals,
• optionally substituted (C1-C4)alkyl radicals,
• saturated, unsaturated, and aromatic carbon rings, optionally substituted,
• wherein it is understood that R′3, R′4, and R′5 can form, in pairs, a saturated or unsaturated ring,
• X− is chosen from electronegative ions and groups of ions,
• wherein it is understood that at least one of the groups R′1 and R′2 is chosen from cationic radicals;
• with the proviso that the method is performed without the addition of a chemical oxidizing agent.