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
氟代苯或其衍
生物反应;
b) 还原步骤a)中得到的产物中的酮基团;
c) 用二甲氧基乙氧基
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。
在另一种实施方式中,步骤e)被步骤f1)和f2)替代:
f1) 用
氰化钠处理步骤d)中得到的产物;
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的[2-(4-
氟苯基)-
苯乙酸]生产工艺(例如更清洁和更高效)。此外,[2-(4-
氟苯基)-
苯乙酸]以纯度>95%的结晶物质形式获得。