Process of producing iminothiazoline derivatives

摘要

There is disclosed a process for producing an iminothiazoline derivative of the general formula: <IMAGE> (I) wherein R1 is halogen, halo(lower)alkyl, halo(lower)alkoxy or halo(lower)alkylthio; R2 is hydrogen or halogen; and R4 is hydrogen or lower alkyl. This compound (I) can be obtained by cyclization of a thiourea derivative of the general formula: <IMAGE> (II) wherein R1, R2 and R4 are each the same as defined above, and R3 is hydrogen or (lower)alkylcarbonyl optionally substituted with at least one substituent selected from the group consisting of halogen, lower alkyl and lower alkoxy.