重氮甲烷 、
(2S)-2-((2aR,3R,5aS,8S,9S,11aR,12aS)-9-acetoxy-2a,5a,8-trimethyltetradecahydro-1H,12H-cyclopenta[a]cyclopropa[e]phenanthren-3-yl)propanoic acid 以
乙醚 为溶剂,
以1 mg的产率得到2-((3S,4S,10R,13R,14S,17R)-3-Acetoxy-4,13,14-trimethyl-tetradecahydro-cyclopropa[9,10]cyclopenta[a]phenanthren-17-yl)-propionic acid methyl ester