Synthesis of endo,exo-furofuranones using a highly diastereoselective C–H insertion reaction
作者:Richard C. D. Brown
DOI:10.1039/a805296d
日期:——
A highly stereoselective ring closure of α-diazo-γ-butyrolactones to form the 2,6-diaryl-3,7-dioxabicyclo[3.3.0]octane ring system is reported; a formal synthesis of the furofuran lignan asarinin 1 is also described.
Melanogenesis inhibitor and skin preparation containing the same
申请人:Ishida Kenya
公开号:US20060088485A1
公开(公告)日:2006-04-27
A melanogenesis inhibitor characterized by containing at least one kind of piperonyl alcohol represented by the following general formula (1)
wherein R is a straight chain or branched chain alkyl group having 3 to 18 carbon atoms, a straight chain or branched chain alkenyl group having 3 to 18 carbon atoms, or an optionally substituted alicyclic alkyl group. The melanogenesis inhibitor is superior in stability and safety and has a high melanogenesis-inhibiting effect; and a skin preparation containing the melanogenesis inhibitor is very stable, safe, and has a sufficient fair skin effect and a sufficient effect for curing skin dyspigmentation.