Synthesis of new dipyridotetraazapentalenes

Article abstract of DOI:10.1016/S0040-4039(97)10311-2

The new heteroaromatic compounds, dipyridotetraazapentalenes 3-5, were synthesized in two steps from readily available triazolopyridines 6 and 10. N-Arylation of 6 and 10 followed by subsequent reductive cyclization of the N-(nitropyridyl)-triazolopyridines with triethylphosphite in toluene afforded 3, 4 and 5, respectively, in good yield. Nitration of 3 afforded the new energetic tetranitrotetraazapentalene derivative 15 in 58% yield.