Synthesis of Intermediate N-Chloroformyl-N-[4-(trifluoromethoxy)phenyl]Methyl Carbamate of Indoxacarb

[Objective]The paper was to study a synthetic method suitable for industrial production of intermediate N-Chloroformyl-N-[4-(trifluoromethoxy)phenyl]methyl carbamate of indoxacarb.[Method]Using 4-trifluoromethoxy aniline as the starting material,[4-(trifluoromethoxy)phenyl]carbamate was synthesized by homogeneous formylation method without acid-binding agent.Subsequently,it was reacted with sodium methoxide/potassium methoxide by reactive distillation to obtain[4-(trifluoromethoxy)phenyl]carbamate ammonium sodium/potassium,then directly reacted with triphosgene to obtain crude products of N-carbonochloridoyl-N-[4-(trifluoromethoxy)phenyl]carbamate;finally,competing product was obtained by recrystallization.[Result]The intermediate N-chloroformyl-N-[4-(trifluoromethoxy)phenyl]carbamate was synthesized by the method.The content of products was higher than 98%.The yield of product reached above 96%(calculated by 4-trifluoromethoxy aniline).[Conclusion]The method used for the synthesis of intermediate N-chloroformyl-N-[4-(trifluoromethoxy)phenyl]methyl carbamate was simple,with less three wastes,higher safety and lower cost.

4-三氟甲氧基苯基-氨基甲酸甲酯的催化合成

常压下,从4-三氟甲氧基苯胺出发,以碳酸二甲酯(DMC)为甲氧羰基化试剂,在不添加其他任何辅助试剂条件下催化合成4-三氟甲氧基苯基氨基甲酸甲酯(TFMPC)。系统研究了负载型和非负载型催化剂、反应温度、反应时间对合成的影响,发现ZrClO2/SiO2在后处理和催化剂再生方面均比Zn(OAc)2/SiO2效果要好,同时在最佳工艺条件下可以得到较好的反应转化率和产品收率。