(3R,5R,10S,13S)-10,13-dimethyl-7-oxohexadecahydrospiro[cyclopenta[a]phenanthrene-17,2'-[1,3]dioxolan]-3-yl acetate 在
sodium tetrahydroborate 、 cerium(III) chloride heptahydrate 作用下,
以
甲醇 为溶剂,
反应 2.0h,
以89%的产率得到3β-acetoxy-17,17-(ethylenedioxy)-7β-hydroxy-5α-androstane