INDUSTRIAL PROCESS FOR THE SYNTHESIS OF 17-ACETOXY-11ß-A4- (DIMETHYLAMINO) -PHENYLÜ-21-METHOXY-19-NORPREGNA-4,9-DIEN-3,20-DION AND MAIN INTERMEDIATES OF THE PROCESS

摘要

The present invention relates to a process for the synthesis of the 17-acetoxy-11-[4-(dimethylamino)-phenyl]-21-methoxy-19-norpregna-4,9-dien-3,20-dione of formula (I): from 3,3-[1,2-etandiyl-bis(oxy)]-oestr-5(10),9(11)-dien-17-one of formula (II):