Patent ID: 6179881
Filing Date: 2001-01-30
Classification: A61K,A61Q,C07C

Abstract:
A method for dyeing keratin fibers comprising the step of contacting said fibers, for a time sufficient to achieve said dyeing, with a compound of formula (II) or an acid addition salt thereof: ##STR7##in which:R.sub.1 and R.sub.2, independently of each other, represent a hydrogen atom; a C.sub.1 -C.sub.6 alkyl radical; a 5- or 6-membered cycloalkyl radical; a 5- or 6-membered aromatic ring; a 5- or 6-membered aromatic ring substituted with a C.sub.1 -C.sub.6 alkyl radical, a halogen atom, an amino radical, a hydroxyl radical, or a C.sub.1 -C.sub.6 alkoxy radical; or R.sub.1 and R.sub.2 form, together with the nitrogen atom to which they are attached, a 4- to 8-membered heterocycle, said heterocycle containing one or more hetero atoms chosen from sulfur, nitrogen and oxygen;R.sub.3 and R.sub.4, independently of each other, represent a hydrogen atom, a C.sub.1 -C.sub.6 alkyl radical, a C.sub.1 -C.sub.6 monohydroxyalkyl radical or a C.sub.2 -C.sub.6 polyhydroxyalkyl radical; andA is a 5- to 6-membered aromatic ring which can be interrupted by one or more hetero atoms chosen from sulfur, nitrogen and oxygen, or fused to another 5- to 6-membered aromatic ring.