A study of nitrogen- and oxygen-containing heterocycles. 42. Pyrimido[4,5-b]- and pyrido[2,3-b]-1,4-benzoxazepines

The reaction of o-haloamino derivatives of pyrimidine and pyridine with o-hydroxy-benzaldehyde and its derivatives leads to the formation of tricyclic 1,4-oxazepine systems. Syntheses are reported for derivatives of pyrimido4,5-b]- and pyrido2, 3-b]-1,4-benzoxazepines as well as of their 5,6-dihydro derivatives. The properties and structures of these compounds were studied.For Communication 41, see 1].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 122–125, January, 1985.