We report below on the new data showing the possibility to prepare by this procedure triazepines fused with a puridine ring. We found that thermolysis of N-imidoyltetrazoles obtained under conditions of the phase-transfer catalysis from 5-aryltetrazoles and N-(m- pyridyl) benzimidoyl chloride gave rise to previously unknown 3H-pyrido [6, 7-b]-1, 3, 4- triazepines.
![2,5-diphenyl-3H-pyrido[6,7-b]-1,3,4-triazepine Structure](https://image.chemsrc.com/caspic/438/657402-30-7.png)
![1-methyl-2,5-diphenylpyrido[3,2-e][1,2,4]triazepine Structure](https://image.chemsrc.com/caspic/276/657402-34-1.png)