Patent ID: 8273781

Claim:
A process for preparation of 1-alkyl-5-benzoyl-1H-tetrazole derivative comprising: a step 1 of reacting a ketoamide derivative represented by formula (I): (in formula (I), A represents a halogen atom, alkyl group, haloalkyl group, alkoxy group, haloalkoxy group, alkyl sulfonyl group, optionally substituted aryl group, cyano group or nitro group; n represents an integer of 0 to 5 (when n is 2 or more, plural A may be the same or different from each other); Y represents an alkyl group) with a halogenating agent to obtain an imidoyl halide derivative represented by formula (II): (in formula (II), A, n and Y are as defined above; X represents a halogen atom); and a step 2 of reacting the imidoyl halide derivative represented by formula (II) with an azide represented by formula (III): M(N 3 ) M (III) (in formula (III), M represents an alkali metal or alkali earth metal; m represents 1 or 2) to obtain a 1-alkyl-5-benzoyl-1H-tetrazole derivative represented by formula (IV): (in formula (IV), A, n and Y are as defined above).