(8R,9S,13S,14S)-13-methyl-17-oxo-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthren-3-yl 2-phenylacetate 、
(E)-1-(甲基磺酰基)-2-苯偶氮 在
potassium carbonate 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以90 %的产率得到(13S)-13-methyl-17-oxo-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthren-3-yl (Z)-2-phenyl-2-(phenylimino)acetate