Synthesis of nitro pyrido- and dipyrido[1,4]oxazines
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3-Nitro-10H-pyrido[3,2-b][1,4]benzoxazines and first representative of a new heterocyclic system, 10H-dipyrido[2,3-e:3,2-b][1,4]oxazine, were obtained by reaction of 2-chloro-3,5-dinitropyridine with various o-aminophenols followed by intramolecular substitution of the nitro group.

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