New 17,20-epoxide derivatives of pregnane, their preparation, their application to the preparation of cortisonic and intermediate derivatives.

摘要

The invention relates to the compounds (I): IMAGE R = oxo or beta -OH and A and B represent a free or protected 3-keto- DELTA 4 or DELTA 1,4 residue, their preparation, their application to the preparation of the compounds (A): IMAGE R3 is a hydroxy radical-protecting group, as well as intermediates.