PROBLEM TO BE SOLVED: To provide a manufacturing method of a novel pest control agent having a 2-acyl iminopyridine structure.SOLUTION: There is provided a manufacturing method of a compound represented by the formula (I), including a process of manufacturing a compound represented by the formula (B) by acylating 2-position amino group of a compound represented by the formula (A) with using an acylation agent in presence of a base and a process of further alkylating 1-position nitrogen atom of a compound represented by the formula (B). [Ar is a phenyl group or 5- to 6-membered hetero ring, Ris a Calkyl group, Y is H, a halogen atom, a hydroxyl group, a Calkyl group substituted/unsubstituted with a halogen atom, a Calkyloxy group substituted/unsubstituted with a halogen atom, a cyano group, a formyl group, a nitro group.]SELECTED DRAWING: None【課題】２－アシルイミノピリジン構造を有する新規有害生物防除剤の製造方法の提供。【解決手段】式（Ａ）で表される化合物の２位アミノ基を、塩基の存在下、アシル化剤を用いてアシル化することによって、式（Ｂ）で表される化合物を製造する工程、および式（Ｂ）で表される化合物の１位窒素原子をさらにアルキル化する工程を含む、式（Ｉ）で表される化合物の製造方法。[Ａｒはフェニル基又は５～６員のヘテロ環；Ｒ１はＣ１－６のアルキル基；ＹはＨ、ハロゲン原子、水酸基、ハロゲン原子で置換／非置換のＣ１－６アルキル基、ハロゲン原子で置換／非置換のＣ１－６アルキルオキシ基、シアノ基、ホルミル基、ニトロ基]【選択図】なし
