propan-2-yl (3R,5S,8R,9S,10S,13R,14S,17R)-2'-chloro-10,13-dimethyl-17-[(2R)-6-methylheptan-2-yl]spiro[1,2,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydrocyclopenta[a]phenanthrene-3,3'-oxirane]-2'-carboxylate 在
三氟乙酸 作用下,
反应 0.08h,
以30%的产率得到propan-2-yl 2-[(3S,5S,8R,9S,10S,13R,14S,17R)-3-chloro-10,13-dimethyl-17-[(2R)-6-methylheptan-2-yl]-1,2,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydrocyclopenta[a]phenanthren-3-yl]-2-oxoacetate