Summary.
The conjugate addition of malononitrile to α,β-unsaturated ketones catalyzed by piperidine yielded 2-amino-4-aryl-6-methyl-5-(phenylthio)-4H-pyran-3-carbonitriles. The reaction of α,β-unsaturated ketones with cyanoacetamide led to 2-pyridone derivatives. The reaction of malononitrile and ethyl cyanoacetate with an enaminone occurred under elimination of dimethylamine to yield 2-pyridone.
Zusammenfassung.
Die konjugierte Addition von Malonitril an α,β-ungesättigte Ketone, die durch Piperidin katalysiert wird, ergibt 2-Amino-4-aryl-6-methyl-5-(phenylthio)-4H-pyran-3-carbonitrile. Die Reaktion α,β-ungesättigter Ketone mit Cyanacetamid führt zu Pyridonderivaten. Die Umsetzung von Malonitril und Ethylcyanoacetat mit einem Enaminon erfolgt unter Eliminierung von Dimethylamin und liefert 2-Pyridonderivate.
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Received June 29, 1998. Accepted (revised) August 24, 1998
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Bogdanowicz-Szwed, K., Budzowski, A. Synthesis of Phenylthio Substituted 4H-Pyrans and 2-Pyridinones by Conjugate Addition-Cyclization of CH-Acids to α,β-Unsaturated Ketones. Monatshefte fuer Chemie 130, 545–554 (1999). https://doi.org/10.1007/PL00010233
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DOI: https://doi.org/10.1007/PL00010233