乙酸酐 、
drevogenin D 在
吡啶 作用下,
反应 3.0h,
以32 mg的产率得到Acetic acid (3S,8R,9S,10R,11S,12S,13S,14S,17S)-3,11-diacetoxy-17-((R)-1-acetoxy-ethyl)-14-hydroxy-10,13-dimethyl-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-12-yl ester