Acetic acid (3S,5S,8R,9S,10S,11R,12R,13S)-3-acetoxy-17-acetyl-11-hydroxy-10,13-dimethyl-1,2,3,4,5,6,7,8,9,10,11,12,13,15-tetradecahydro-20-oxa-cyclopropa[14,15]cyclopenta[a]phenanthren-12-yl ester 在
三氟化硼乙醚 作用下,
以
乙醚 、
苯 为溶剂,
生成
11β-Hydroxy-3β.12α-diacetoxy-5α-pregnen-(16)-dion-(15.20)