Reaction of diphenylcyclopropenon, diphenylcyclopropenethione, and triphenylcyclopropene with N-benzoyl-N-methyl-C-phenylglycine in acetic anhydride provides a convenient route to 4-pyridones, pyridine-4-thiones, and 1,4-dihydropyridines, respectively; the anhydro-5-hydroxy-3-methyl-2-phenylthiazolium hydroxide system also reacts readily with diphenylcyclopropenethione.
K. T. Potts and J. Baum, J. Chem. Soc., Chem. Commun., 1973, 833 DOI: 10.1039/C39730000833
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