乙酸酐 、
7α-Acetoxy-6α-hydroxy-23ξ-methoxy-3-oxo-24,25,26,27-tetra-norapotirucalla(apoeupha)-1,14,20(22)-trieno-21,23-lactone 在
吡啶 作用下,
反应 48.0h,
生成 [(5R,6R,7S,8R,9R,10R,13S,17R)-7-acetyloxy-17-(2-methoxy-5-oxo-2H-furan-4-yl)-4,4,8,10,13-pentamethyl-3-oxo-5,6,7,9,11,12,16,17-octahydrocyclopenta[a]phenanthren-6-yl] acetate