ethyl (24S)-6β-methoxy-3α,5-cyclo-5α-stigmastan-26-oate 在
lithium aluminium tetrahydride 、
Diethylamino(dimethylamino)sulphur difluoride 作用下,
以
四氢呋喃 、
二氯甲烷 为溶剂,
生成 (1aR,3aR,3bS,5aR,6R,8aS,8bS,10R,10aR)-6-((1R,4S)-4-Ethyl-6-fluoro-1,5-dimethyl-hexyl)-10-methoxy-3a,5a-dimethyl-hexadecahydro-cyclopenta[a]cyclopropa[2,3]cyclopenta[1,2-f]naphthalene