α-Oxoketen S,S-diacetals (1), (4), and (6) react readily with cyanoacetamide in the presence of sodium isopropoxide in boiling propan-2-ol to give substituted and fused 3-cyano-4-methylmercapto-2(1H)-pyridones (2), (5), and (7) respectively.
R. R. Rastogi, H. Ila and H. Junjappa, J. Chem. Soc., Chem. Commun., 1975, 645 DOI: 10.1039/C39750000645
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