申请人:CHUGAI SEIYAKU KABUSHIKI KAISHA
公开号:EP1870392A1
公开(公告)日:2007-12-26
The invention provides a process for production of 2,3,4-trifluoro-5-(iodo or bromo)benzoic acid, the process comprising a halogenation step in which direct iodination or bromination of 2,3,4-trifluorobenzoic acid is performed with an iodinating agent or brominating agent in a reaction solvent in the presence of an oxidizing agent. According to the invention, there is provided a process for convenient production of 2,3,4-trifluoro-5-(iodo or bromo)benzoic acid in high yield and high purity in a highly regioselective manner.
本发明提供了一种生产2,3,4-三氟-5-(碘或溴)苯甲酸的工艺,该工艺包括一个卤化步骤,在该步骤中,2,3,4-三氟苯甲酸在氧化剂存在下,在反应溶剂中用碘化剂或溴化剂直接碘化或溴化。根据本发明,提供了一种以高区域选择性方式高产率、高纯度生产 2,3,4-三氟-5-(碘或溴)苯甲酸的简便工艺。