Isobutyraldehyde in the Synthesis of Isopropyl-substituted 4H-Pyrans, 1,4-Dihydropyrano[2,3-c]pyrazole, 1,4-Dihydropyridines, and Cyclobutane
作者:V. D. Dyachenko、A. N. Chernega
DOI:10.1007/s11176-005-0351-6
日期:2005.6
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.
异丁醛与 CH 酸(如乙酰乙酰苯胺、二甲基酮、乙酰乙酰胺、苯甲酰乙酸乙酯、间苯二酚、氰乙酸、丙二腈、3-甲基-1-乙基-2-吡唑啉-5-酮、苯甲酰丙酮和氰乙酰胺)缩合、在胺的存在下,产生了异丙基取代的 4H-吡喃、1,4-二氢吡喃并[2,3-c]吡唑、4H-苯并[b]吡喃、1,4-二氢吡啶和 1,1-二氰基-2-(1-氰基-1-乙氧羰基)甲基-4-异丙基-3,3-二甲基环丁烷。通过 X 射线衍射分析研究了后一种产品的结构。