FIELD: heterocyclic compounds. SUBSTANCE: suitable 2-carboxypyrazine is oxidized by aqueous hydrogen peroxide. The process takes place in the presence of alkali metal tungstic acid salt at ratio 1: 1.2-2.3: 0.025 by mixing at 70-80 C and pH 1.5-2. EFFECT: increases yield of desired product, simplifies the process.
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