(3S,5R,8R,9S,10S,13R,14S,17S)-3-Benzyloxy-17-ethoxyoxalyl-10,13,17-trimethyl-hexadecahydro-cyclopenta[a]phenanthrene-14-carboxylic acid 在
lead(IV) acetate 、 copper diacetate 作用下,
以
吡啶 、
苯 为溶剂,
以60%的产率得到((3S,5R,8R,9S,10S,13S,17S)-3-Benzyloxy-10,13,17-trimethyl-2,3,4,5,6,7,8,9,10,11,12,13,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl)-oxo-acetic acid ethyl ester