STEROIDS CONTAINING A KETONIC RADICAL IN POSITON 23, THEIR PREPARATION PROCESS AND THEIR USE IN THE PREPARATION OF PRODUCTS IN THE 20-KETOPREGNANE SERIES

摘要

ABSTRACT OF THE DISCLOSURE: The invention relates to compounds of formula (I): (I) wherein R1 is hydrogen or methyl, R2 is methyl or ethyl, the nuclei A, B, C and D possibly carry one or more double bonds and are optionally substituted by one or more functions or by one or more atoms or radicals R is halogen, hydroxy, alkoxy, aralkoxy, alkylthio, arylthio, aralkylthio or with the exception of the product in which R represents a methoxy radical, R1 and R2 each represent a methyl radical, ring A door of 3-beta-acetoxy function and ring B carries a double bond 5 (6). The invention also concerns the method for preparing the compounds of formula (I). The invention further relates to the application of. Products of formula (I) for the preparation of products of the 20-keto pregnane series.