New Syntheses of Alloxazine 5-Oxides and Fervenulin 4-Oxides by the Nitrative Cyclization

Abstract

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.