NOVEL PROCESS FOR THE PRODUCTION OF [2-(4-FLUORO-BENZYL)-PHENYL]-ACETIC ACID
    2.
    发明申请
    NOVEL PROCESS FOR THE PRODUCTION OF [2-(4-FLUORO-BENZYL)-PHENYL]-ACETIC ACID 有权
    用于生产[2-(4-氟 - 苯基) - 苯基] - 酸的新工艺

    公开(公告)号:US20070213556A1

    公开(公告)日:2007-09-13

    申请号:US11574300

    申请日:2005-08-26

    IPC分类号: C07C57/34 C07C55/28

    摘要: 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%.

    摘要翻译: 本发明涉及生产由邻苯二甲酸酐获得的化合物的[2-(4-氟 - 苄基) - 苯基] - 乙酸的新方法。 该方法包括随后的步骤a)至e):a)在合适的反应条件下使邻苯二甲酸酐与氟苯或其衍生物反应; b)在酮部分上还原在步骤a)中获得的产物; c)将步骤b)中得到的产物用二氢 - 双(2-甲氧基乙氧基)铝酸钠(Red-Al)还原成相应的醇; d)氯化步骤c)中得到的醇; e)通过合适的含Pd催化体系将CO插入到步骤d)中获得的产物中。 在替代实施方案中,步骤e)被步骤f1)和f2)代替:f1)使步骤d)中获得的产物与氰化钠反应; f2)水解步骤f1)中获得的产物。 本发明提供了适用于工业规模的反应器(例如更清洁和更有效)的[2-(4-氟 - 苄基) - 苯基] - 乙酸的生产方法。 此外,得到纯度> 95%的结晶物质的2-(4-氟 - 苄基) - 苯基] - 乙酸。