劳森试剂 、 19β,28-epoxy-3β-hydroxy-18α-oleanan-2-one 以
甲苯 为溶剂,
反应 5.0h,
以52%的产率得到(1R,4R,5R,8R,10S,16R,17R,20R,21R,22R)-12-(4-methoxyphenyl)-4,5,9,9,16,23,23-heptamethyl-12-sulfanylidene-27-oxa-11,13-dithia-12lambda5-phosphaheptacyclo[20.3.2.01,21.04,20.05,17.08,16.010,14]heptacos-14-ene