3β-Acetoxy-21,22-dioxo-18α,19βH-ursan-28->20β-olide 在
碳酸氢钠 作用下,
以
甲醇 、
氯仿 为溶剂,
反应 15.0h,
以28 mg的产率得到methyl (1S,2S,4aS,6aR,6bR,8aR,10S,12aR,12bR,14aR,14bR,15R)-10-acetoxy-15-hydroxy-1,2,6a,6b,9,9,12a-heptamethyl-4-oxooctadecahydro-2H,4H-2,4a-methanophenanthro[2,1-f]isochromene-15-carboxylate