氰化钾 、 (1S,4aS,4bR,9R,10aS)-[9'α-(tert-butyldimethylsilyl)oxy]-1,2,3,4,4a,4b,5,6,7,9,10,10a-dodecahydro-1β-methoxycarbonyl-8-(2',2'-dimethoxyethyl)-1α,4aβ-dimethylphenanthren-7-one 在
18-冠醚-6 、
二乙基氰化铝 作用下,
以
甲苯 、
苯 为溶剂,
反应 20.0h,
以75%的产率得到(4S,5S,7R,8R,9R,10S,16R)-7α-[(tert-butyldimethylsilyl)oxy]-8β-cyano-1,2,3,4,5,6,7,8,9,10,11,12,15,16-tetradecahydro-4β-methoxycarbonyl-16β-methoxy-17-oxa-cyclopenta[a]-4α,10β-dimethylphenanthrene