(8R,9S,10R,13S,14S,17S)-17-(1-Ethoxy-ethoxy)-10,13-dimethyl-1,2,6,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-cyclopenta[a]phenanthren-3-one 在
crown ether 、
18-冠醚-6 、
potassium tert-butylate 、
氧气 作用下,
以
甲苯 为溶剂,
反应 73.5h,
生成 (1S,8S,9S,10R,13S,14S,17S)-17-(1-Ethoxy-ethoxy)-1-hydroxy-10,13-dimethyl-6,7,8,9,10,11,12,13,14,15,16,17-dodecahydro-1H-2-oxa-cyclopenta[a]phenanthren-3-one