Process for the preparation of substituted acyl ureas

摘要

The invention relates to a process for the preparation of acyl ureas of formula (I) <IMAGE> (I) wherein R1 and R2 are the same of different and each is halogen atom, preferably fluorine or chlorine atom, and R3 is a substituted aryl group. The compounds of the invention can be prepared by reacting an urea of formula (II): R3NHCONH2 (II) wherein R3 is as defined above, with an acid chloride of formula (III): <IMAGE> (III) wherein R1 and R2 are as defined above, in an inert organic solvent at a temperature of from 20 DEG C. to 100 DEG C.