[(1S)-1-[(1S,3R,9S,10R,13S,14R,17S)-1,3-bis[[tert-butyl(dimethyl)silyl]oxy]-10,13-dimethyl-2,3,4,9,11,12,14,15,16,17-decahydro-1H-cyclopenta[a]phenanthren-17-yl]ethyl] acetate 在
Amberlyst 15 作用下,
以
四氢呋喃 、
甲醇 为溶剂,
反应 14.5h,
以99%的产率得到[(1S)-1-[(1S,3R,9S,10R,13S,14R,17S)-1-[tert-butyl(dimethyl)silyl]oxy-3-hydroxy-10,13-dimethyl-2,3,4,9,11,12,14,15,16,17-decahydro-1H-cyclopenta[a]phenanthren-17-yl]ethyl] acetate