Syntheses of heterocycles via intramolecular cycloaddition of azahexatrienes. Photochemical cyclization of 5-arylazo-6-dimethylaminomethyleneamino-1,3-dimethyluracils.

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Photochemical cyclization of 5-arylazo-6-dimethylaminomethyleneamino-1, 3-dimethyluracils (I), 1, 2, 5-triazahexatriene-type precursors, under aerobic condition resulted in the formation of 6-aryl-1, 3-dimethyl-6, 7-dihydro-6-azalumazine-7-ones. On the other hand, the photolysis of I under anaerobic condition gave 8-arylaminotheophyllines.

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