1,2,3-Triazolo(1,5)Azines et Autres Hétérocycles Azotés Dérivés D'Azine-carboxaldéhydes

α-(N)-azine-carboxaldehydes are convenient precursors of 1,2,3-triazolo (1,5) azines. Through oxidative cyclization of the corresponding hydrazones we have prepared the new 1,2,3-triazolo (1,5-b)pyridazine and 1,2,3-triazolo (1,5-a)pyrazine. Unlike the other azaindolizines these compounds are degraded by electrophiles. Attempts to prepare imidazo(1,5-c) pyrimidine or derivatives have been carried out either from 4-aminomethylpyrimidine or from ethyl 2-(4-pyrimidinyl)propionate.