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The N-(2,4-dinitrophenyl) salts of N,N-diethylnicotinamide and ethyl nicotinate undergo [4++ 2] cycloaddition with enol ethers at room temperature, providing the first examples of Bradsher cyclization by monocyclic quaternary aza-aromatics; other derivatives and salts of pyridine are inert under these conditions.
J. R. Falck, S. J. Wittenberger, D. Rajapaksa, C. Mioskowski and B. Boubia, J. Chem. Soc., Perkin Trans. 1, 1990, 413 DOI: 10.1039/P19900000413
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