The invention relates to an industrial process for the preparation of 17-hydroxy-6β,7β;15β,16β-bismethylene-3-oxo-17α-pregn-4-ene-21-carboxylic acid γ-lactone of formula (I), and to the key-intermediates for this process.
本发明涉及一种工业制备17-羟基-6β,7β;15β,16β-双亚甲基-3-酮-17α-孕-4-烯-21-
羧酸γ-内酯(式(I))的过程,以及该过程的关键中间体。