(1S,2S)-1-{(R)-2-Acetoxy-2-[(1S,4aR,6R,8aS)-6-(dimethyl-phenyl-silanyl)-8a-hydroxymethyl-3,8-dioxo-decahydro-naphthalen-1-yl]-ethyl}-2-((R)-1-methoxy-ethyl)-5-oxo-cyclopentanecarboxylic acid methyl ester 在
吡啶 、
4-二甲氨基吡啶 、
双(三甲基硅烷基)氨基钾 作用下,
以
四氢呋喃 、
甲苯 为溶剂,
反应 16.17h,
生成 (3R,5R,8R,9S,10S,11R,13S,14S,17S)-11-Acetoxy-10-acetoxymethyl-3-(dimethyl-phenyl-silanyl)-14-hydroxy-17-((R)-1-methoxy-ethyl)-1,7-dioxo-hexadecahydro-cyclopenta[a]phenanthrene-13-carboxylic acid methyl ester