Acetic acid (S)-5a,7a-dimethyl-2-methylene-3-oxo-octadecahydro-cyclobuta[j]cyclopenta[a]phenanthren-8-yl ester 在
三氟化硼乙醚 作用下,
以
苯 为溶剂,
反应 1.0h,
以95%的产率得到Acetic acid 4-isopropenyl-10,13-dimethyl-3-oxo-2,3,6,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl ester