(6β,20S,23Z)-20-hydroxy-6-methoxy-24-(phenylthio)-24-(trimethylsilyl)-3α,5α-cyclochol-23-ene 、
丙酮 在
六甲基磷酰三胺 、
仲丁基锂 作用下,
生成 (E)-2-((1aR,3aR,3bS,5aS,6S,8aS,8bS,10R,10aR)-10-Methoxy-3a,5a-dimethyl-hexadecahydro-cyclopenta[a]cyclopropa[2,3]cyclopenta[1,2-f]naphthalen-6-yl)-6-methyl-5-phenylsulfanyl-hepta-3,5-dien-2-ol