A ready one-pot preparation for 7-oxa(or thia)-3,4,6-triazabenz[d,e]anthracene and 7-oxa-3,4,6,9-tetrazabenz[d,e]anthracene derivatives

Article abstract of DOI:10.1016/0040-4020(96)00570-4

Derivatives of 7-oxa-3,4,6-triazabenz[d,e]anthracene, 7-oxa-3,4,6,9-tetrazabenz[d,e]anthracene and 7-thia-3,4,6-triazabenz[d,e]anthracene are obtained from the appropriate substituted o-aminonitrile pyridine derivatives and N,N-dimethyldichloromethyleniminium chloride (phosgeniminium chloride).