The first synthesis of furazano [3,4 -b][1,6 ]naphthyridines

Reaction of 6-acetyl-7-aminofurazano[3,4-b]pyridines with DMFDMA afforded N,N-dimethylformamidines that were cyclized to the novel furazan-fused [1,6]naphthyridine system by treatment with sodium methylate in good yield. The tricyclic system is characterized by X-ray crystallography.

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