Phenacylamin derivatives, production thereof and pest controllers containing the derivatives

A process for producing a phenacylamine derivative of the formula (I) or a salt thereof:

• 17
• wherein A is alkyl, cycloalkyl, phenyl which may be substituted by Y, pyridyl which may be substituted by Y, or pyrazolyl which may be substituted by Y, R1 and R2 are each alkyl, or R1 and R2 may together form a 3- to 6-membered saturated carbocycle, R3 is hydrogen, alkyl, alkoxyalkyl, alkylthioalkyl or COR4, R4 is alkyl or alkoxy, X is halogen, alkyl, haloalkyl, alkenyl, haloalkenyl, alkynyl, haloalkynyl, alkoxy, haloalkoxy, alkenyloxy, haloalkenyloxy, alkynyloxy, haloalkynyloxy, alkylthio, haloalkylthio, alkenylthio, haloalkenylthio, alkynylthio, haloalkynylthio, alkylsulfinyl, haloalkylsulfinyl, alkylsulfonyl, haloalkylsulfonyl, dialkylaminosulfonyl, nitro, cyano, phenyl which may be substituted by Y, phenoxy which may be substituted by Y, benzyloxy which may be substituted by Y, or pyridyloxy which may be substituted by Y, Y is halogen, alkyl, haloalkyl, alkoxy, haloalkoxy, alkylthio, haloalkylthio, alkylsulfinyl, haloalkylsulfinyl, alkylsulfonyl, haloalkylsulfonyl, dialkylaminosulfonyl, nitro or cyano, n is an integer of from 0 to 5, and when n is 2 or more, a plurality of X may be the same or different, provided that a case where A is unsubstituted phenyl, R1 and R2 are each methyl or together form a 6-membered saturated carbocycle, R3 is hydrogen, and n is 0, is excluded, which comprises (A) reacting a compound of the formula (II):
• 18
• wherein R1, R2, X and n are as defined above, with a compound of the formula (III):
• A-COZ (III)
• wherein A is as defined above, and Z is hydroxyl, alkoxy or halogen, or (B) reacting a compound of the formula (1-1):
• 19
• wherein A, R1, R2, X and n are as defined above, with a compound of the formula (IV):
• R3′—W (IV)
• wherein R3′ is alkyl, alkoxyalkyl, alkylthioalkyl or COR4, R4 is as defined above, and W is halogen.