乙酸酐 、
2',3'-OO-isopropylideneafroside 以
吡啶 为溶剂,
反应 16.0h,
以222 mg的产率得到(1R,3R,3aS,3bR,5aS,6aR,7aS,9R,10aR,13aR,14aR,15aS,15bS,17aR)-3a-hydroxy-9,12,12,15a,17a-pentamethyl-1-(5-oxo-2,5-dihydrofuran-3-yl)octadecahydro-1H,7aH,9H-[1,3]dioxolo[4',5':3,4]pyrano[2,3-b]cyclopenta[7,8]phenanthro[3,2-e][1,4]dioxin-3-yl acetate