New steroid derivatives of pregna-4,9(11),17(20)-trien-3-on, their preparation, their use in the preparation of derivatives of pregna-4,9(11),16-trien-3,20-dione and intermediates therefor

摘要

The invention relates to the compounds (I): …IMAGE… where Hal is chlorine or bromine, R is (C1-C6)alkyl, (C7-C15)aralkyl or a silylated residue, K is a group …IMAGE… (n = 2 or 3) and the wavy lines symbolise the possible existence of 2 isomers, to their preparation and to their application in the preparation of the compounds (A): …IMAGE… where R1 is a (C1-C8)acyl and new intermediate.