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- 15 methoxyethoxy) aluminate (Red-Al) to the corresponding alcohol ; d) chlorinat ing 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) hydro lysing 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%.
本发明涉及一种新型工艺,用于生产[2-(4-
氟苄基)-苯基]-
乙酸,这是一种可以从
邻苯二甲酸酐中获得的化合物。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) 还原步骤a)中得到的产物的酮基团;c) 将步骤b)中得到的产物用双(2-15 甲氧基乙氧基)
铝酸钠(Red-Al)还原为相应的醇;d)
氯化步骤c)中得到的醇;e) 通过适当的含Pd催化系统将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)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。本发明提供了一种用于生产[2-(4-
氟苄基)-苯基]-
乙酸的工艺,适用于工业规模反应器(例如更清洁和更高效),且[2-(4-
氟苄基)-苯基]-
乙酸以纯度>95%的结晶物质形式获得。