丙二烯 、 Acetic acid (5R,10S,13R,17R)-17-((R)-1,5-dimethyl-hexyl)-10,13-dimethyl-7-oxo-2,3,4,5,6,7,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-3-yl ester 反应 1.5h,
以72%的产率得到(3S,5R,8S,9S,10S,13R,14R,17R)-10,13-dimethyl-19-methylene-17-((R)-6-methylheptan-2-yl)-7-oxotetradecahydro-11H-8,9-ethanocyclopenta[a]phenanthren-3-yl acetate