N-Substituents are transferred from pyridinium cations to malonate, cyanoacetate, and acetoacetate carbanions: for alkyl substituents the pentacyclic derivatives (4) attain the required activity.
A. R. Katritzky and S. S. Thind, J. Chem. Soc., Perkin Trans. 1, 1981, 661 DOI: 10.1039/P19810000661
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