发明授权
US4057543A Process for the preparation of 17.beta.-hydroxy-3-oxo-17.alpha.-pregn-4-ene-21-carboxylic acid .gamma.-lactone 失效
制备17 {62-羟基-3-氧代-17 {60-孕-4-烯-21-羧酸{65-内酯

Process for the preparation of
17.beta.-hydroxy-3-oxo-17.alpha.-pregn-4-ene-21-carboxylic acid
.gamma.-lactone
摘要:
A new process utilizing certain novel intermediates for the preparation of 17.beta.-hydroxy-3-oxo-17.alpha.-pregn-4-ene-21-carboxylic acid .gamma.-lactone is described herein. The procedure utilizes readily available and inexpensive sarsasaponin as starting material.
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