(1R,3S,5S,8R,9S,10R,11R,13R,14S,17S)-11-acetoxy-10-(acetoxymethyl)-17-(((tert-butyldiphenylsilyl)oxy)methyl)-3,5,14-trihydroxy-13-methylhexadecahydro-1H-cyclopenta[a]phenanthren-1-yl 4-methoxybenzoate 、
乙酸酐 在
吡啶 、
4-二甲氨基吡啶 作用下,
以
二氯甲烷 为溶剂,
反应 24.0h,
以65%的产率得到[(1R,3S,5S,8R,9S,10R,11R,13R,14S,17S)-3,11-diacetyloxy-10-(acetyloxymethyl)-17-[[tert-butyl(diphenyl)silyl]oxymethyl]-5,14-dihydroxy-13-methyl-2,3,4,6,7,8,9,11,12,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-1-yl] 4-methoxybenzoate