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.
本文描述了一种利用某些新颖中间体制备17.beta.-羟基-3-酮-17.alpha.-孕-4-烯-21-
羧酸.gamma.-内酯的新工艺。该过程利用易得且廉价的山药
皂苷作为起始材料。