[(3R,8R,9S,10S,13S,14S)-10,13-dimethyl-17-(trifluoromethylsulfonyloxy)-2,3,4,5,6,7,8,9,11,12,14,15-dodecahydro-1H-cyclopenta[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58%的产率得到tert-butyl 2-[(3R,8R,9S,10S,13S,14S)-3-acetyloxy-10,13-dimethyl-2,3,4,5,6,7,8,9,11,12,14,15-dodecahydro-1H-cyclopenta[a]phenanthren-17-yl]acetate