Acetic acid (3R,5S,8R,9S,10S,13S,14S)-17-[1,5-dimethyl-hex-(E)-ylidene]-10,13-dimethyl-hexadecahydro-cyclopenta[a]phenanthren-3-yl ester 在
N-溴代丁二酰亚胺(NBS) 、
过氧化氢苯甲酰 作用下,
以
四氯化碳 为溶剂,
反应 3.0h,
以53%的产率得到Acetic acid (3R,5S,8R,9S,10S,13S,14S)-17-((Z)-1,5-dimethyl-hex-1-enyl)-10,13-dimethyl-2,3,4,5,6,7,8,9,10,11,12,13,14,15-tetradecahydro-1H-cyclopenta[a]phenanthren-3-yl ester