Acetic acid (8R,9S,13S,14S,16S,17R)-16-ethyl-16-hydroxy-3-methoxy-13-methyl-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthren-17-yl ester 在
吡啶 、
三氯氧磷 作用下,
生成
Acetic acid (8R,9S,13S,14S,17S)-16-eth-(E)-ylidene-3-methoxy-13-methyl-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthren-17-yl ester