16-((E)-4-chlorobenzylidene)-3-hydroxy-10,13-dimethyl-1,2,3,4,7,8,9,10,11,12,13,14,15,16-tetradecahydro-17H-cyclopenta[a]phenanthren-17-one 、
氰乙酸乙酯 在
sodium ethanolate 作用下,
以
乙醇 为溶剂,
以72%的产率得到2'-oxo-3'-cyano-6'-(4-chlorophenyl)-androst-5-ene[17,16-c]pyran-3β-ol