Acetic acid (3S,8S,9S,10R,13S,14S,17S)-10,13-dimethyl-17-(1-trifluoromethanesulfonyloxy-vinyl)-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-3-yl ester 、
(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62%的产率得到3-((3S,8S,9S,10R,13S,14S,17R)-3-Acetoxy-10,13-dimethyl-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl)-but-3-enoic acid tert-butyl ester