Acetic acid (3S,5S,8S,9S,10S,11R,13S,14S,17S)-3-acetoxy-17-(cyano-hydroxy-methyl-methyl)-10,13-dimethyl-hexadecahydro-cyclopenta[a]phenanthren-11-yl ester 在
lead(IV) acetate 、
碘 、
calcium carbonate 作用下,
以
环己烷 为溶剂,
生成
3β,11α-Diacetoxy-18-cyano-20-oxo-5α-pregnan