(3S,5S,9R,10S,13R,14R,17R)-17-((2S,3S)-3-hydroxypent-4-en-2-yl)-10,13-dimethyl-2,3,4,5,6,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-3-yl benzoate 、
丙酸酐 在
4-二甲氨基吡啶 、
三乙胺 作用下,
以
二氯甲烷 为溶剂,
反应 2.0h,
以95%的产率得到[(3S,5S,9R,10S,13R,14R,17R)-10,13-dimethyl-17-[(2S,3S)-3-propanoyloxypent-4-en-2-yl]-2,3,4,5,6,9,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3-yl] benzoate