乙酸酐 、
Δ 25(27)-pentrogenin 以
吡啶 为溶剂,
反应 2.0h,
以49 mg的产率得到[(1S,2S,4S,6R,7S,8R,9S,12S,13S,14S,15S,16S,17S,18R)-14,16,17-triacetyloxy-18-hydroxy-7,9,13-trimethyl-5'-methylidenespiro[5-oxapentacyclo[10.8.0.02,9.04,8.013,18]icosane-6,2'-oxane]-15-yl] acetate