申请人:Shell Internationale Research Maatschappij B.V.
公开号:US05189197A1
公开(公告)日:1993-02-23
The invention provides a process for the preparation of N-benzoylcarbamates of general formula ##STR1## wherein R.sup.1 represents a hydrogen atom, a halogen atom, a C.sub.1-4 alkyl group, a C.sub.1-4 alkoxy group or a trifluoromethyl group, R.sup.2 represents a halogen atom, a C.sub.1-4 alkyl group, a C.sub.1-4 alkoxy group or a trifluoromethyl group, R.sup.3 represents a hydrogen atom, a halogen atom, a methyl group or a trifluoromethyl group, and R represents a C.sub.1-8 alkyl group optionally substituted by one or more halogen atoms or a phenyl group optionally substituted by one or more substituents selected from halogen atoms and methyl groups, characterized by reacting an alkali metal salt of a benzamide of general formula ##STR2## wherein R.sup.1, R.sup.2 and R.sup.3 are as defined above, with a carbonate of formula RO--CO--OR (III) wherein R is as defined above, in the presence of an inert solvent, and neutralizing the resulting alkali metal salt of the compound of formula I; and (intermediate) alkali metal salts of the compounds of formula I.
该发明提供了一种制备一般式N-苯甲酰基氨基甲酸酯的过程,其中R.sup.1代表氢原子、卤原子、C.sub.1-4烷基、C.sub.1-4烷氧基或三氟甲基,R.sup.2代表卤原子、C.sub.1-4烷基、C.sub.1-4烷氧基或三氟甲基,R.sup.3代表氢原子、卤原子、甲基或三氟甲基,R代表C.sub.1-8烷基,该烷基可选择性地被一个或多个卤原子取代,或者是一个苯基,该苯基可选择性地被一个或多个卤原子和甲基取代,其特征在于将一般式N-苯甲酰基氨基甲酸酯的苯甲酰胺的碱金属盐与一种碳酸酯在惰性溶剂存在下反应,并将生成的一般式I化合物的碱金属盐中和;以及(中间体)化合物I的碱金属盐。