N-苯基双(三氟甲烷磺酰)亚胺 、
Acetic acid (3S,5S,8R,9S,10S,12R,13R,14S)-3-acetoxy-10,13-dimethyl-17-oxo-hexadecahydro-cyclopenta[a]phenanthren-12-yl ester 在
双(三甲基硅烷基)氨基钾 作用下,
以
四氢呋喃 为溶剂,
以91%的产率得到[(3S,5S,8R,9S,10S,12R,13R,14S)-12-acetyloxy-10,13-dimethyl-17-(trifluoromethylsulfonyloxy)-2,3,4,5,6,7,8,9,11,12,14,15-dodecahydro-1H-cyclopenta[a]phenanthren-3-yl] acetate