[(3S,8R,9S,10R,13S,14S,17E)-10,13-dimethyl-17-[1-(trifluoromethylsulfonyloxy)ethylidene]-1,2,3,4,7,8,9,11,12,14,15,16-dodecahydrocyclopenta[a]phenanthren-3-yl] acetate 、
(2-tert-butoxy-2-oxoethyl)zinc(II) bromide 在
bis-triphenylphosphine-palladium(II) chloride 、
二异丁基氢化铝 作用下,
以
四氢呋喃 、
甲苯 为溶剂,
以57%的产率得到tert-butyl (3E)-3-[(3S,8R,9S,10R,13S,14S)-3-acetyloxy-10,13-dimethyl-1,2,3,4,7,8,9,11,12,14,15,16-dodecahydrocyclopenta[a]phenanthren-17-ylidene]butanoate