[(E)-4-[(7R,8R,9S,10R,13S,14S,17S)-17-acetyloxy-10,13-dimethyl-3-oxo-1,2,6,7,8,9,11,12,14,15,16,17-dodecahydrocyclopenta[a]phenanthren-7-yl]but-2-enyl] (2R)-2-[(2-methylpropan-2-yl)oxycarbonylamino]-3-pyridin-2-ylpropanoate 在
三氟乙酸 作用下,
以
二氯甲烷 为溶剂,
反应 5.0h,
以95%的产率得到(E)-4-[(7R,10R,13S,17S)-17-acetoxy-10,13-dimethyl-3-oxo-2,3,6,7,8,9,10,11,12,13, 14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-7-yl]but-2-en-1-yl (2R)-2-amino-3-(pyridin-2-yl)propanoate