Patent ID: 7989483

Claim:
A 4-heteroarylimidazole-2-thione tyrosinase inhibiting compound of general formula (I): in which: X is an oxygen atom or a sulfur atom, Y is a carbon atom or a nitrogen atom, when R2=H, then R1 is: a C 1 -C 7 alkyl radical, a C 3 -C 7 cycloalkyl radical, with the proviso that one of the carbon atoms of the ring may optionally be replaced by an oxygen or sulfur atom, a C 4 -C 9 cycloalkylalkyl radical, a carboxyl substituent, a (C 1 -C 6 alkoxy)carbonyl radical, or a C 1 -C 4 alkyl radical substituted by a (C 1 -C 4 alkoxy)carbonyl, and, when R2 is other than a hydrogen atom, then R 1 and R 2 , which may be identical or different, are selected from among: a C 1 -C 7 alkyl radical, a C 3 -C 7 cycloalkyl radical, with the proviso that one of the carbon atoms of the ring may optionally be replaced by an oxygen or sulfur atom, a C 4 -C 9 cycloalkylalkyl radical, a carboxyl substituent, a (C 1 -C 6 alkoxy)carbonyl radical, or a C 1 -C 4 alkyl radical substituted by a (C 1 -C 4 alkoxy)carbonyl radical, and, when R2 is in the ortho position with respect to R1, then R1 and R2 together form a hydrocarbon ring containing 5 or 6 carbon atoms, and the salts and tautomeric forms thereof.