Acetic acid (1R,2R,5S,10S,13S,17S)-1,10,13-trimethyl-3-oxo-hexadecahydro-20-oxa-cyclopropa[1,2]cyclopenta[a]phenanthren-17-yl ester 在
aluminum oxide 、 sodium tetrahydroborate 作用下,
以
水 、
苯 为溶剂,
以330 mg的产率得到1α,2α-epoxy-1β-methyl-5α-androstane-3α,17β-diol 17-monoacetate