A process for producing isatoic anhydrides of the formula (II):
which comprises reacting an anthranilic acid of formula (I):
or a salt thereof with phosgene
using a mixed solvent of water and an organic solvent miscible with water and inert to the reaction;
conducting the reaction in the presence of an alkylpyridinium salt in an aqueous solvent; or
using a mixed solvent of water and a specific amount of an organic solvent substantially immiscible with water and inert to the reaction.
一种生产式(II)异
靛红酸酐的工艺:
其中包括将式(I)的
蚁酸
或其盐与
光气反应
使用
水和与
水混溶且对反应惰性的有机溶剂混合溶剂;
在有烷基
吡啶鎓盐存在的情况下,在
水性溶剂中进行反应;或
使用
水和一定量的有机溶剂组成的混合溶剂,有机溶剂基本上不与
水混溶且对反应惰性。