Method for producing dichloropyrazine derivative

A method for producing a hydroxypyrazine derivative represented by formula (I) (wherein R1 represents a halogen atom), the method including reacting a pyrazine derivative represented by formula (III) (wherein R2 represents a nitrile group, an N-unsubstituted or N-substituted carbamoyl group, an ester group or a carboxyl group, M represents a cation capable of forming a salt, and n represents a number corresponding with the valence of M) with a halogenating agent. Also, a method for producing a dichloropyrazine derivative represented by formula (II) (wherein R21 represents a nitrile group, an N-unsubstituted or N-substituted carbamoyl group, an ester group, a carboxyl group, or a group formed as a result of a change in the functional group of R2 during chlorination), the method including reacting the hydroxypyrazine derivative (I) with a chlorinating agent.