申请人:Hoechst Aktiengesellschaft
公开号:US05543550A1
公开(公告)日:1996-08-06
The present invention relates to a process for the preparation of 5-fluoroanthranilic alkyl esters and/or 5-fluoroanthranilic acid, which comprises dissolving a 3-fluorobenzoic alkyl ester in sulfuric acid and reacting the solution with a nitrating acid at from -10.degree. to 30.degree. C., then adding water, separating off the nitrated reaction product and reacting it with hydrogen at from 50.degree. to 120.degree. C. under elevated pressure in the presence of a catalyst comprising a metal of the platinum group and sulfur, and, if desired, removing 5-fluoroanthranilic alkyl esters by distillation and hydrolyzing them to give 5-fluoroanthranilic acid.
本发明涉及一种制备5-氟基蒽酰基烷基酯和/或5-氟基蒽酰基酸的方法,包括将3-氟苯甲酸烷基酯溶解在硫酸中,并在-10℃至30℃的范围内将所述溶液与硝化酸反应,然后加入水,分离出硝化反应产物,并在铂族金属和硫的催化剂存在下,在50℃至120℃的升压条件下与氢反应,如有需要,通过蒸馏去除5-氟基蒽酰基烷基酯,并将其水解为5-氟基蒽酰基酸。