乙酸酐 、
N-((8R,9S,10R,13S,14S)-3,17-Dihydroxy-10,13-dimethyl-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-16-ylmethyl)-2-phenyl-acetamide 在
吡啶 作用下,
以95%的产率得到Acetic acid (8R,9S,10R,13S,14S)-3-acetoxy-10,13-dimethyl-16-(phenylacetylamino-methyl)-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl ester