Abstract
Condensation of isobutyraldehyde with CH acids, such as acetoacetanilide, dimedone, acetoacetamide, ethyl benzoylacetate, resorcinol, cyanoacetic acid, malononitrile, 3-methyl-1-ethyl-2-pyrazolin-5-one, benzoylacetone, and cyanoacetamide, in the presence of amines gave isopropyl-substituted 4H-pyrans, 1,4-dihydropyrano[2,3-c]pyrazole, 4H-benzo[b]pyranes, 1,4-dihydropyridines, and 1,1-dicyano-2-(1-cyano-1-ethoxycarbonyl)methyl-4-isopropyl-3,3-dimethylcyclobutane. The structure of the latter product was studied by X-ray diffraction analysis.
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Translated from Zhurnal Obshchei Khimii, Vol. 75, No. 6, 2005, pp. 1007–1016.
Original Russian Text Copyright © 2005 by Dyachenko, Chernega.
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Dyachenko, V.D., Chernega, A.N. Isobutyraldehyde in the Synthesis of Isopropyl-substituted 4H-Pyrans, 1,4-Dihydropyrano[2,3-c]pyrazole, 1,4-Dihydropyridines, and Cyclobutane. Russ J Gen Chem 75, 952–960 (2005). https://doi.org/10.1007/s11176-005-0351-6
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DOI: https://doi.org/10.1007/s11176-005-0351-6