[EN] PROCESS FOR PREPARING BENZO[1,2-B;4,5-B']DITHIOPHENE-4,8-DICARBOXYLIC ACID OR ITS 2,3-DIHYDRO DERIVATIVE<br/>[FR] PROCÉDÉ DE PRÉPARATION D'ACIDE BENZO[1,2-B ; 4,5-B']DITHIOPHÈNE-4,8-DICARBOXYLIQUE OU DE SON DÉRIVÉ 2,3-DIHYDRO
申请人:MERCK PATENT GMBH
公开号:WO2013139426A1
公开(公告)日:2013-09-26
The invention relates to a process for preparing benzo[1,2-b;4,5- b']dithiophene-4,8-dicarboxylic acid or its 2,3-dihydro derivative, and to novel products prepared by this process which comprises the following steps: A) heating benzo[1,2-b;4,5-b']dithiophene-4,4,8,8-tetracarboxylic acid, or an acid derivative thereof, in an organic solvent in the presence of a base and an oxidising agent, and adding an acid, to give benzo[1,2-b;4,5-b']dithiophene-4,8-dicarboxylic acid, or B) heating benzo[1,2-b;4,5-b']dithiophene-4,4,8,8-tetracarboxylic acid, or an acid derivative thereof, in a polar organic solvent in the presence of a base under exclusion of an oxidising agent, and adding an acid, to give 2,3-dihydrobenzo[1,2-b;4,5-b']dithiophene-4,8- dicarboxylic acid.
本发明涉及一种制备苯并[1,2-b;4,5-b']二噻吩-4,8-二羧酸或其2,3-二氢衍生物的方法,以及通过该方法制备的新产品。该方法包括以下步骤:A) 在有机溶剂中,在碱和氧化剂的存在下,加酸加热苯并[1,2-b;4,5-b']二噻吩-4,4,8,8-四羧酸或其酸衍生物,得到苯并[1,2-b;4,5-b']二噻吩-4,8-二羧酸;或B) 在极性有机溶剂中,在碱的存在下,排除氧化剂,加酸加热苯并[1,2-b;4,5-b']二噻吩-4,4,8,8-四羧酸或其酸衍生物,得到2,3-二氢苯并[1,2-b;4,5-b']二噻吩-4,8-二羧酸。