| 摘要 |
Cosmetic methods of skin lightening using coumarin derivatives of formula I as skin lightening agents alone or in combination with other skin benefit agents and together with a cosmetic vehicle:Where each or both R1 and/or R2 represents hydrogen; linear or branched C1-C18 alkyl, alkenyl, cycloalkyl, cycloalkenyl, hydroxyalkyl, hydroxyalkenyl, acyl, cycloacyl, or alkoxy groups;Each or both R3 and/or R4, which may be connected by a single or double carbon-carbon bond (shown as a dotted line), represents hydrogen; linear or branched C1-C18 alkyl, alkenyl, alkoxy, cycloalkyl, or cycloalkenyl group; andEach or both R5 and/or R6 represents a hydrogen atom, OH, C1-C4 acyl group, C1-C4 alkyl group, O-CO-R7, O-COO-R8 group, mesyl group or tosyl group, where each or both R7 and/or R8 represents hydrogen; linear or branched C1-C18 alkyl, alkenyl, hydroxyalkyl, hydroxyalkenyl, acyl, cycloacyl, or alkoxy groups.
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