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2. Synthesis of mesoionic s-triazines (Mesoionic sixmembered heterocycles, VII)
Stadlbauer W., Kappe Th., Chem. Ber. 109, 3661-3667 (1976)

Abstract: Condensation of N-substituted 2-Aminopyridines (1a-c) with derivatives of azamalonic acid (2 and 7) yields the mesoionic bicyclic compounds 4a-c via the allophanates 3a-c as intermediates. The N,N'-disubstituted amidine 1d reacts in the same way to yield 4d.

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abstract scheme