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.
[EN] IMPROVED PROCESS FOR THE PREPARATION OF A COMPOUND USEFUL AS ANTI-VIRAL COMPOUND<br/>[FR] PROCÉDÉ AMÉLIORÉ POUR LA PRÉPARATION D'UN COMPOSÉ UTILE EN TANT QUE COMPOSÉ ANTIVIRAL
申请人:OCIMUM LABS PRIVATE LTD
公开号:WO2022029585A1
公开(公告)日:2022-02-10
The present invention relates to an improved process for the preparation of a compound useful in the preparation of anti-viral compound. The present invention specifically relates to an improved process for the preparation of compound having the Formula (I) or its salts. The present invention also relates to an improved process for the preparation of Favipiravir having the Formula (II) or its salts.