Synthesis of nitro pyrido- and dipyrido[1,4]oxazines

摘要

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-chloro3,5-dinitropyridine with various o-aminophenols followed by intramolecular substitution of the nitro group.