Methoxy-acetic acid (1aR,3aR,3bS,5aS,7R,8aS,8bR,10R,10aR)-6-eth-(E)-ylidene-10-methoxy-3a,5a-dimethyl-hexadecahydro-cyclopenta[a]cyclopropa[2,3]cyclopenta[1,2-f]naphthalen-7-yl ester 在
三甲基氯硅烷 、
lithium diisopropyl amide 作用下,
生成 (2R,3S)-2-Methoxy-3-((1aR,3aR,3bS,5aS,8aS,8bR,10R,10aR)-10-methoxy-3a,5a-dimethyl-1,1a,2,3,3a,3b,4,5,5a,8,8a,8b,9,10-tetradecahydro-cyclopenta[a]cyclopropa[2,3]cyclopenta[1,2-f]naphthalen-6-yl)-butyric acid