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HYDROXYPYRAZINES AND THEIR DERIVATIVES

Oxidation of nuclear and extranuclear hydroxypyrazines (and derivatives) to their Af-oxides has been achieved with hydrogen peroxide in acetic acid, and with m-chloroperoxybenzoic acid in 1,2-dichIoroethane. 3-Hydroxy-2,5-diisobutyl-pyrazine was oxidized with 30% hydrogen peroxide in acetic acid at 70 to 3-hydroxy-2,5-diisobutylpyrazine 1-oxide (101), 3-hydroxy-2-(Af-methyl-A -phenyl-carbamoyl)pyrazine 1-oxide (90) was also prepared from the conesponding pyrazine [its A -4-methyl derivative was prepared similarly and also by methylation of (90) (1055)], and 3-hydroxy-2-(A -methyl-AAp-tolylcarbamoyl)pyrazine 1-oxide (1055) was synthesized analogously. [Pg.187]

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2- -3-hydroxypyrazine

Hydroxypyrazines

Their Derivatives

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