申请人:Hara Tamio
公开号:US20110275817A1
公开(公告)日:2011-11-10
A method for producing a hydroxypyrazine derivative represented by formula (I) (wherein R
1
represents a halogen atom), the method including reacting a pyrazine derivative represented by formula (III) (wherein R
2
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 R
21
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 R
2
during chlorination), the method including reacting the hydroxypyrazine derivative (I) with a chlorinating agent. According to the present invention, a dichloropyrazine derivative can be produced efficiently at low cost, and a hydroxypyrazine derivative that functions as a production intermediate for the dichloropyrazine derivative can be produced efficiently at low cost.
生产一种由式(I)表示的羟基吡嗪衍生物的方法(其中R1表示卤素原子),该方法包括将由式(III)表示的吡嗪衍生物(其中R2表示腈基,未取代或取代的N-卡波基基团,酯基或羧基,M表示能够形成盐的阳离子,n表示与M的价相对应的数字)与卤化剂反应。此外,本发明还涉及一种生产由式(II)表示的二氯吡嗪衍生物的方法(其中R21表示腈基,未取代或取代的N-卡波基基团,酯基,羧基或在氯化反应期间由R2的官能团改变而形成的基团),该方法包括将羟基吡嗪衍生物(I)与氯化剂反应。根据本发明,可以以低成本高效地生产二氯吡嗪衍生物,并且可以以低成本高效地生产作为二氯吡嗪衍生物生产中间体的羟基吡嗪衍生物。