New syntheses of alloxazine 5-oxides and fervenulin 4-osides by the nitrative cyclization.

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The treatment of 6-anilinouracils with potassium nitrate in acetic acid in the presence of sulfuric acid led to the exclusive formation of the corresponding alloxazine 5-oxides. Similarly, the treatment of 6-benzylidenehydrazino-1, 3-dimethyluracils with the same reagents gave the corresponding fervenulin 4-oxides.

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