Synthesis of melanoquaternary compounds and their use as hair dyes and for skin treatment

摘要

Water soluble, cationic compounds useful as hair colorants or for the treatment of skin which are esters or amides formed by reaction of 5,6-dihydroxyindole-2-carboxylic acid or its N-substituted derivatives and a quaternary salt containing a reactive amino or hydroxyl group, and polymers from such compounds obtained by oxidative polymerization.