tert-butyl (E)-(1''S,3a''R,7a''S)-3-[8'-(1''-tert-butoxy-7a''-methyl-2'',3'',3a'',6'',7'',7a''-hexahydro-1''H-inden-5''-yl)-1',4'-dioxaspiro[4.5]dec-7'-en-7'-yl]acrylate 以
萘烷 为溶剂,
反应 0.75h,
以83%的产率得到tert-butyl (+)-(7R,13S,14R,17S)-17-tert-butoxy-13-methylspiro(1',3'-dioxolane[2'.3]-2,3,4,6,7,11,12,13,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthrene)-7-carboxylate