3β-acetoxy-5,6β-epoxy-5β-pregnan-20-one 在
bismuth triflate (Bi(OTf)3*H
2O) 作用下,
以
硝基甲烷 为溶剂,
反应 72.0h,
以65%的产率得到[(3S,5R,6R,8S,9R,10S,14R)-17-acetyl-6-hydroxy-5,14-dimethyl-2,3,4,6,7,8,9,10,11,12,15,16-dodecahydro-1H-cyclopenta[a]phenanthren-3-yl] acetate