申请人:Guillaume Maurice Andre Michel Joseph
公开号:US20070213556A1
公开(公告)日:2007-09-13
The present invention relates to a novel process for the production of [2-(4-fluoro-benzyl)-phenyl]-acetic acid, a compound obtainable from phthalic anhydride. The process comprises the subsequent steps a) through e): a) reacting phthalic anhydride with fluorobenzene or a derivative thereof in appropriate reaction conditions; b) over reducing the product obtained in step a) at the ketone moiety; c) reducing the product obtained in step b) with sodium dihydro-bis(2-methoxyethoxy)aluminate (Red-Al) to the corresponding alcohol; d) chlorinating the alcohol obtained in step c); e) inserting CO into the product obtained in step d) through an appropriate Pd-containing catalytic system. In an alternative embodiment, the step e) is replaced by the steps f1) and f2): f1) reacting the product obtained in step d) with sodium cyanide; f2) hydrolysing the product obtained in step f1). The present invention provides a process for the production of [2-(4-fluoro-benzyl)-phenyl]-acetic acid which is suitable for industrial scale reactors (e.g. which is cleaner and more efficient). Also, [2-(4-fluoro-benzyl)-phenyl]-acetic acid is obtained as a crystalline material with a purity >95%.
本发明涉及一种从邻氟苯甲醛中可获得的[2-(4-氟苯基)-苯乙酸]的新型生产工艺。该工艺包括以下步骤a)至e):a)在适当的反应条件下将邻苯二甲酸酐与氟苯或其衍生物反应;b)在酮基上过量还原步骤a)中得到的产物;c)用双甲氧基乙氧基铝酸钠(Red-Al)还原步骤b)中得到的产物为相应的醇;d)氯化步骤c)中得到的醇;e)通过适当的含Pd催化体系将CO插入步骤d)中得到的产物。在另一实施例中,步骤e)被步骤f1)和f2)所替代:f1)将步骤d)中得到的产物与氰化钠反应;f2)水解步骤f1)中得到的产物。本发明提供了一种适用于工业规模反应器(例如更清洁和更高效)的[2-(4-氟苯基)-苯乙酸]生产工艺。此外,[2-(4-氟苯基)-苯乙酸]以纯度>95%的结晶物质形式获得。