3β-acetoxy-19,20,21,22,28,29,30-heptanor-18,19-seco(17βH)lupan-18-one 在
劳森试剂 作用下,
以
甲苯 为溶剂,
反应 5.0h,
以77%的产率得到[(2S,4aR,4bR,10aS,10bR,12aR)-7-[[(4aS,4bR,6aR,8S,10aR,10bR)-8-acetyloxy-4a,4b,7,7,10a-pentamethyl-2,3,4,5,6,6a,8,9,10,10b,11,12-dodecahydrochrysen-1-yl]sulfanyl]-1,1,4a,10a,10b-pentamethyl-2,3,4,4b,5,6,8,9,10,11,12,12a-dodecahydrochrysen-2-yl] acetate