(20R,22R)-2β,3β:20,22-bis[(dimethylmethylene)dioxy]-25-hydroxy-5β-cholest-8(14)-en-6-one 在
sodium methylate 、 palladium 10% on activated carbon 、
氢气 作用下,
以
甲醇 为溶剂,
反应 2.5h,
以65%的产率得到(20R,22R)-25-hydroxy-2β,3β:20,22-bis(isopropylidenedioxy)-13-demethyl-14β-methyl-9α,13α-epoxy-5β,8α-cholestan-6-one