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)-acetamide 在
吡啶 作用下,
以96%的产率得到Acetic acid (8R,9S,10R,13S,14S)-3-acetoxy-16-(acetylamino-methyl)-10,13-dimethyl-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl ester