甲醇 、 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
乙醚 为溶剂,
反应 36.0h,
以39%的产率得到3α-methoxalyl-3β-methoxy-5α-cholestane