重氮甲烷 、
(-)-(7R,8R,13S,14S,17S)-17-hydroxy-13-methyl-3-oxo-2,3,6,7,8,11,12,13,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthrene-7-carboxylic acid 以
甲醇 、
乙醚 为溶剂,
反应 0.17h,
以98%的产率得到methyl (+)-(7R,8R,13S,14S,17S)-17-hydroxy-13-methyl-3-oxo-2,3,6,7,8,11,12,13,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthrene-7-carboxylate