Primary intermediates for oxidative coloration of hair
View Patent ↗Primary intermediates for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): where R 1 , and R 2 are each individually selected from a hydrogen atom, a C 1 to C 3 alkyl group, a C 1 to C 5 mono or dihydroxyalkyl group; phenyl or benzyl optionally substituted with an alkoxy group, or R 1 and R 2 together with the nitrogen atom to which they are attached form a piperazine, piperidine, imidazole, or morpholine ring.
1. A compound of formula (1):
wherein R 1 is selected from the gronp consisting of a hydrogen atom, C 1 to C 5 alkyl, C 1 to C 5 mono or dihydroxyalkyl, phenyl or benzyl optionally substituted with a hydroxyl, amino or C 1 to C 5 alkoxy group; and R 2 is selected from the group consisting of C 1 to C 5 alkyl, C 1 to C 5 mono or dihydroxyalkyl, phenil or benzyl optionally substituted with a hydroxyl, amino or C 1 to C 3 alkoxy group; or R 1 and R 2 together with the nitrogen atom to which they are attached form a C 5 to C 6 saturated or unsaturated ring optionally containing in the ring one or more additional hetero atoms selected from O, S and N atoms.
2. A compound of claim 1 wherein R 1 is selected from the group consisting of a hydrogen atom, a C 1 to C 3 alkyl group, phenyl or benzyl optionally substituted with a C 1 to C 3 alkoxy group; and R 2 is selected from the group consisting of a C 1 to C 3 alkyl group, phenyl or benzyl optionally substituted with a C 1 to C 3 alkoxy group; or R 1 and R 2 together with the nitrogen atom to which they are bound form a piperazine, piperidine, imidazole, or morpholine ring.
3. A compound of claim 2 wherein R 1 is hydrogen and R 2 is phenyl.
4. A compound of claim 2 wherein R 1 and R 2 together with the nitrogen atom to which they are bound form a piperidine ring.
5. A compound of claim 2 wherein R 1 and R 2 together with the nitrogen atom to which they are bound form a morpholine ring.
6. A compound of claim 2 wherein R 1 and R 2 are both methyl.