1, 4-Cycloaddition of 4-Phenyl-l, 2, 4-Triazoline-3,5-Dione to 2-Vinylpyridines

The addition of 4-phenyl-1, 2, 4-triazoline-3, 5-dione (I) to the pseudodienic system of 2-vinylpyridines leads to a new heterocyclic system — triazolol, 2-]-5-azacinnoline. A second molecule of I undergoes further reaction of the substitutive addition type.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 702–705, May, 1976.