重氮甲烷 、
(3S,5S,8R,9S,10S,13S,14S,17S)-3,17-Diacetoxy-10,13-dimethyl-hexadecahydro-cyclopenta[a]phenanthrene-3-carboxylic acid 以
乙醚 为溶剂,
生成 (3S,5S,8R,9S,10S,13S,14S,17S)-3,17-Diacetoxy-10,13-dimethyl-hexadecahydro-cyclopenta[a]phenanthrene-3-carboxylic acid methyl ester