Synthèse des pyrido[2,3-d] el [3,2-d] -s-triazolo[3,4-f] pyrimidines el de (pyrazolyl-1')-4 pyrido[2,3-d] et [3,2-d] pyrimidines

The synthesis of two new heterocycles is described: pyrido-2,3-d]-.s-triazolo 3,4-f] pyrimidine and pyrido3,2-d]-.s-triayzolo-3,4-f] pyrimidine. 4-I'-Pyrazolyl]pyrido2,3-d]pyrimidines and 4-1′-pyrazoly1] pyrido 3,2-d] pyrimidine are obtained by the action of 4-hydrazinopyrido2,3-d]pyrimidine and 4-hydrazinopyrido-3,2-d]pyrimidine with several β-diketones.