| abstract |
The invention relates to the compounds (I): in which : R₁ is hydrogen or methyl, R₂ is methyl or ethyl, the nuclei A, B, C and D optionally 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, aralcoxy, alkylthio, arylthio, aralkylthio their preparation process, their application to the preparation of products of the 20-keto pregnane series and intermediates of this application. |