methyl (4R)-4-[(3S,10R,13R,17R)-3-hydroxy-10,13-dimethyl-2,3,4,7,8,9,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-17-yl]pentanoate 在
N-甲基-4-哌啶酮 、 aluminum isopropoxide 作用下,
以
甲苯 为溶剂,
反应 3.0h,
以64%的产率得到methyl (4R)-4-[(10R,13R,17R)-10,13-dimethyl-3-oxo-1,2,4,7,8,9,11,12,14,15,16,17-dodecahydrocyclopenta[a]phenanthren-17-yl]pentanoate