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 以
甲醇 、
正辛烷 、
乙醚 为溶剂,
反应 6.0h,
生成
3'-methoxyspiro<5α-cholestane-3α:2'-oxirane>-3'-carboxylate d'isopropyle