Reaction of 1,2,4-triazolo[4,3-a] pyridine (1) with dimethyl acethylenedicarboxylate gives the pyrimidone (10), the pyrazole (6), and the 1 : 2-adduct (7); reaction mechanisms, which include a [1,5] CN shift from nitrogen to carbon, are proposed, and two earlier structures for products of this reaction are corrected.
D. G. Heath and C. W. Rees, J. Chem. Soc., Chem. Commun., 1982, 1280 DOI: 10.1039/C39820001280
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