INDUSTRIAL PROCESS FOR THE SYNTHESIS OF ULIPRISTAL ACETATE AND ITS 4'-ACETYL ANALOGUE

摘要

The present invention relates to a new process for the synthesis of compounds of formula (I) (wherein the meaning of R is dimethylamino or acetyl group) using the compound of formula (II) (wherein the meaning of R is dimethylamino or 2-methyl-1,3-dioxolan-2-yl group) as starting material, as well as to the intermediate of the process.