三甲基氯硅烷 、
(5R,8R,9R,10S,13S,14S,17S)-17-tert-Butoxy-13-methyl-hexadecahydro-cyclopenta[a]phenanthren-3-one 在
chiral lithium amide ((S)-5b) 作用下,
以
正己烷 、
甲苯 为溶剂,
反应 0.33h,
以97%的产率得到((5S,8R,9R,10R,13S,14S,17S)-17-tert-Butoxy-13-methyl-2,5,6,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-3-yloxy)-trimethyl-silane