(S)-((3S,5R,8R,9S,10S,13R,14S,17R)-14-hydroxy-10,13-dimethyl-17-(2-oxo-2H-pyran-5-yl)hexadecahydro-1H-cyclopenta[a]phenanthren-3-yl) 2-(tert-butoxycarbonylamino)-4-methylpentanoate 在
盐酸 、
碳酸氢钠 作用下,
以
乙酸乙酯 为溶剂,
反应 2.5h,
以48.5%的产率得到(S)-((3S,5R,8R,9S,10S,13R,17S)-10,13-dimethyl-17-(2-oxo-2H-pyran-5-yl)-2,3,4,5,6,7,8,9,10,11,12,13,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-3-yl) 2-amino-4-methylpentanoate