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Publikováno v:
Journal of Heterocyclic Chemistry. 27:157-162
The regioselective synthesis of pyrido[2,3-b]- and [3,4-b]pyrazine derivatives II by the Hinsberg reaction is reported starting from 2,3 and 3,4-diaminopyridine and excess of pyruvic acid or ethyl pyruvate as reactants. Good yields (higher than 90%)