N-heteroarylmethyl-m-phenylenediamine derivatives-containing dyes for keratin fibers and novel n-heteroarylmethyl-m-phenylenediamine derivatives

1. An agent for oxidative dyeing of keratin fibers, said agent containing at least one developer and at least one coupler, wherein said at least one coupler is at least one N-heteroarylmethyl-m-phenylenediamine derivative of formula (I), or a salt thereof with an organic or inorganic acid,

wherein X5 denotes sulfur, nitrogen, oxygen, C—R6 or N—R5;

X6 denotes sulfur, nitrogen, oxygen, C—R7 or N—R5;

X7 denotes sulfur, nitrogen, oxygen, C—R8 or N—R5;

R1 denotes hydrogen, a C 1 –C 4 -alkyl group, a C 1 –C 4 -hydroxyalkoxy group or a C 1 –C 4 -hydroxyalkyl group;

R2 and R3 can be equal or different and independently of each other denote hydrogen or a C 1 –C 6 -alkyl group;

R4, R6, R7, R8 can be equal or different and independently of each other denote hydrogen, a halogen atom, a cyano group, a C 1 –C 4 -alkoxy group, a C 1 –C 6 -alkyl group, a C 1 –C 4 -alkyl thioether group, a mercapto group, a nitro group, an amino group, a C 1 –C 4 -alkylamino group, a di(C 1 –C 4 )-alkylamino group, a di(C 1 –C 4 -hydroxyalkyl)amino group, a C 1 –C 4 -hydroxyalkylamino group, a trifluoromethyl group, a —C(O)CH 3 — group, a —C(O)CF 3 group, an —Si(CH 3 ) 3 group, a C 1 –C 4 -hydroxyalkyl group or a C 3 –C 4 dihydroxyalkyl group; and R5 denotes hydrogen, a C 1 –C 6 -alkyl group, a C 2 –C 4 -hydroxyalkyl group, a phenyl group or an acetyl group; and

wherein at least one and at the most two of the X5 to X7 groups denote respectively C—R6 or C—R7 or C—R8 and at the most one of the X5 to X7 groups denote sulfur, oxygen or N—R5.

2. The agent according to claim 1 , wherein R1 denotes said hydrogen or said C 1 –C 4 -hydroxyalkyl group, and wherein R2 and R3, or R2, R3 and R4, each denote said hydrogen.

3. The agent according to claim 1 , wherein R1 denotes said hydrogen or said C 1 –C 4 -hydroxyalkyl group, R2 and R3, or R2, R3 and R4, each denote said hydrogen, X5 denotes said sulfur or said oxygen, X6 denotes said nitrogen or said C—R7 and X7 denotes said C—R8, and at least one of R7 and R8 denotes said hydrogen.

4. The agent according to claim 1 , wherein R1 denotes said hydrogen or said C 1 –C 4 -hydroxyalkyl group, R2 and R3, or R2, R3 and R4, each denote said hydrogen, X7 denotes said sulfur or said oxygen, X5 denotes said C—R6 and X6 denotes said C—R7, and at least one of R6 and R7 denotes said hydrogen.

5. The agent according to claim 1 , wherein R1 denotes said hydrogen or said C 1 –C 4 -hydroxyalkyl group, R2 and R3, or R2, R3 and R4, denote said hydrogen, X6 denotes said sulfur or said oxygen, X5 denotes said C—R6 and X7 denotes said C—R8, and at least one of R6 and R8 groups denotes said hydrogen.

6. The agent according to claim 1 , wherein the at least one N-heteroaryl-methyl-m-phenylenediamine derivative of formula (I) is selected from the group consisting of N-thiophen-3-ylmethyl-1,3-diaminobenzene, N-furan-3-ylmethyl-1,3-diaminobenzene, N-furan-2-ylmethyl-1,3-diaminobenzene, N-thiopher-2-ylmethyl-1,3-diaminobenzene, 2-{4-amino-2-[(thiophen-3-ylmethyl)-amino]-phenoxy}ethanol, 2-{4-amino-2-[(thiophen-2-ylmethyl)amino]-phenoxy}-ethanol, 2-{4-amino-2-[(furan-3-ylmethyl)amino]phenoxy}ethanol, 2-{4-amino-2-[(furan-2-ylmethyl)amino]phenoxy}ethanol, 2-{2-amino-4-[(thiophen-2-ylmethyl)-amino]-phenoxy}ethanol and 2-{2-amino-4-[(furan-2-ylmethyl)amino]-phenoxy}-ethanol, or is a salt thereof.

7. The agent according to claim 1 , containing from 0.005 to 20 weight percent of said at least one N-heteroarylmethyl-m-phenylenediamine derivative of said formula (I).

8. The agent according to claim 1 , wherein the at least one developer is selected from the group consisting of 1,4-diaminobenzene, 1,4-diamino-2-methylbenzene, 1,4-diamino-2,6-dimethylbenzene, 1,4-diamino-3,5-diethyl-benzene, 1,4-diamino-2,5-dimethylbenzene, 1,4-diamino-2,3-dimethyl-benzen, 2-chloro-1,4-diaminobenzene, 1,4-diamino-2-(thiophen-2-yl)benzene, 1,4-diamino-2-(thiophen-3-yl)benzene, 1,4-diamino-2-(pyridin-3-yl)benzene, 2,5-diaminobiphenyl, 1,4-diamino-2-methoxymethyl-benzene, 1,4-diamino-2-aminomethylbenzene, 1,4-diamino-2-hydroxymethyl-benzene, 1,4-diamino-2-(2-hydroxyethoxy)benzene, 1-(2,5-diaminophenyl)-ethanol, 2-[2-(acetylamino)-ethoxy)]-1,4-diaminobenzene, 4-phenylaminoaniline, 4-dimethylaminoaniline, 4-diethylaminoaniline, 4-dipropylaminoaniline, 4-[ethyl-(2-hydroxyethyl)amino]-aniline, 4-[di(2-hydroxyethyl)amino]aniline, 4-[di(2-hydroxyethyl)amino]-2-methylaniline, 4-[(2-methoxyethyl)amino]aniline, 4-[(3-hydroxypropyl)amino]-aniline, 4-[(2,3-dihydroxypropyl)amino]aniline, 1,4-diamino-2-(2-hydroxyethyl)-benzene, 1,4-diamino-2-(1-methylethyl)benzene, 1,3-bis-[(4-aminophenyl)-(2-hydroxyethyl)amino]-2-propanol, 1,4-bis-[(4-aminophenyl)amino]butane, 1,8-bis-(2,5-diaminophenoxy)-3,6-dioxaoctane, 4-aminophenol, 4amino-3-methylphenol, 4-amino-3-(hydroxymethyl)phenol, 4-amino-3-fluorophenol, 4-methylaminophenol, 4-amino-2-(aminomethyl)phenol, 4-amino-2-(hydroxymethyl)phenol, 4-amino-2-fluorophenol, 4-amino-2-[(2-hydroxyethyl)-amino]-methylphenol, 4-amino-2-methylphenol, 4-amino-2-(methoxymethyl)phenol, 4-amino-2-(2-hydroxyethyl)phenol, 5-aminosalicylic acid, 2,5-diaminopyridine, 2,4,5,6-tetraaminopyrimidine, 2,5,6-triamino-4-(1H)-pyrimidone, 4,5-diamino-1-(2-hydroxyethyl)-1H-pyrazole, 4,5-diamino-1-(1-methylethyl)-1H-pyrazole, 4,5-diamino-1-[(4-methylphenyl)methyl]-1H-pyrazole, 1-[(4-chlorophenyl)methyl]-4,5-diamino-1H-pyrazole, 4,5-diamino-1-methyl-1H-pyrazole, 4,5-diamino-3-methyl-1-methyl-1H-pyrazole, 2-aminophenol, 2-amino-6-methylphenol and 2-amino-5-methylphenol.

9. The agent according to claim 1 , further comprising at least one other coupler in addition to said at least one coupler.

10. The agent according to claim 1 , further comprising at least one direct dye.

11. The agent according to claim 9 , containing from 0.005 to 20 percent by weight of at total amount of said at least one developer, said at least one coupler and said at least one other coupler.

12. A ready-to-use colorant made by mixing an agent for oxidative dyeing of keratin fibers with an oxidant in a weight ratio of the agent to the oxidant of 5:1 to 1:3;

wherein said a gent of oxidative dyeing of keratin fibers contains at least one developer and al least one coupler; and

wherein said at least one coupler comprises at least one N-heteroarylmethyl-m-phenylenediamine derivative of formula (I), or a salt thereof with an organic or inorganic acid,

wherein X5 denotes sulfur, nitrogen, oxygen, C—R6 or N—R5;

X6 denotes sulfur, nitrogen, oxygen, C—R7 or N—R5;

X7 denotes sulfur, nitrogen, oxygen, C—R8 or N—R5;

R1 denotes hydrogen, a C 1 –C 4 -alkyl group, a C 1 –C 4 -hydroxyalkoxy group or a C 1 –C 4 -hydroxyalkyl group;

R2 and R3 can be equal or different and independently of each other denote hydrogen or C 1 –C 6 -alkyl group;

R4, R6, R7, R8 can be equal or different and independently of each other denote hydrogen, a halogen atom, a cyano group, a C 1 –C 4 -alkoxy group, a C 1 –C 6 -alkyl group, a C 1 –C 4 -alkyl thioether group, a mercapto group, a nitro group, an amino group, aC 1 –C 4 -alkylamino group, a di(C 1 –C 4 )-alkylamino group, a di(C 1 –C 4 -hydroxyalkyl)amino group, a C 1 –C 4 -hydroxyalkylamino group, a trifluoromethyl group, a —C(O)CH 3 — group, a —C(O)CF 3 group, an —Si(CH 3 ) 3 group, a C 1 –C 4 -hydroxyalkyl group or a C 3 –C 4 dihydroxyalkyl group; and R5 denotes hydrogen, a C 1 –C 6 -alkyl group, C 1 –C 4 -hydroxyalkyl group, a phenyl group or an acetyl group; and

wherein at least one and at the most two of the X5 to X7 groups denote respectively C—R6 or C—R7 or C—R8 and at the most one of the X5 to X7 groups denote sulfur, oxygen or N—R5.

13. The ready-to-use colorant as defined in claim 12 , having a pH of 3to 11.5.

14. The ready-to-use colorant as defined in claim 12 , consisting of a hair colorant.

15. A heteroarylmethyl-m-phenylenediamine derivative of formula (II), or a water-soluble salt thereof with an organic or an inorganic acid,

wherein X5 denotes sulfur, nitrogen, oxygen, C—R6 or N—R5;

X6 denotes sulfur, nitrogen, oxygen, C—R7 or N—R5;

X7 denotes sulfur, nitrogen, oxygen, C—R8 or N—R5;

R1 denotes hydrogen, a C 1 –C 4 -alkyl group, a C 1 –C 4 -hydroxyalkoxy group or a C 1 –C 4 -hydroxyalkyl group;

R2 and R3 can be equal or different and independently of each other denote hydrogen or a C 1 –C 6 -alkyl group;

R4, R6, R7, R8 can to equal or different and independently of each other denote hydrogen, a halogen atom, a cyano group, a C 1 –C 4 -alkoxy group, a C 1 –C 6 -alkyl group, a C 1 –C 4 -alkyl thioether group, a mercapto group, a nitro group, an amino group, a C 1 –C 4 -alkylamino group, a di(C 1 –C 4 )-alkylamino group, a di(C 1 –C 4 -hydroxyalkyl)amino group, a C 1 –C 4 -hydroxyalkylamino group, a trifluoromethyl group, a —C(O)CH 3 — group, a —C(O)CF 3 group, an —Si(CH 3 ) 3 group, a C 1 –C 4 -hydroxyalkyl group or a C 1 –C 4 dihydroxyalkyl group; and R5 denotes hydrogen, a C 1 –C 6 -alky group, a C 1 –C 4 -hydroxyalkyl group, a phenyl group or an acetyl group; and

wherein at least one and at the most two of the X5 to X7 groups denote respectively C—R6 or C—R7 or C—R8 and at the most one of the X5 to X7 groups denote sulfur, oxygen or N—R5;

provided that at least one of the R1, R2, R3, R4, R6, R7 and R8 groups does not denote said hydrogen when X5 or X6 denotes said sulfur.