乙酸酐 、
4-((3S,5S,8R,9R,10R,13R,14S,17R)-5-hydroxy-13-methyl-3-(((3S,4S,5S,6R)-3,4,5-trihydroxy-6-methyltetrahydro-2H-pyran-2-yl)oxy)tetradecahydro-1H-8,10-(epoxymethano)cyclopenta[a]phenanthren-17-yl)furan-2(5H)-one 在
吡啶 作用下,
反应 20.0h,
以95%的产率得到(3S,4S,5R,6R)-2-(((3S,5S,8R,9R,10R,13R,14S,17R)-5-hydroxy-13-methyl-17-(5-oxo-2,5-dihydrofuran-3-yl)tetradecahydro-1H-8,10-(epoxymethano)cyclopenta[a]phenanthren-3-yl)oxy)-6-methyltetrahydro-2H-pyran-3,4,5-triyl triacetate