摘要
DL-norgestrel is a widely used oral contraceptive. D-norgestrel （1） has been synthesized from an optically active intermediate （3） which was prepared from 13-ethyl-8, 14-seco steroid （2） by microbiological asymmetric reduction(1)Optically active compound （6） or （9） is also an intermediate for the synthesis of D-norgestrel. Thus, com-
