Industrial method for the synthesis of 17-acetoxy-11²-[4-(dimethylamino)-phenyl]-21-methoxy-19-norpregna-4,9-dien-3,20-dione and the key intermediates of the process
摘要
The present invention relates to a process for the synthesis of the 17-acetoxy-11&bgr;-[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):