Isovaleric Aldehyde in the Synthesis of 4-Isobutyl-Substituted Pyridine-2(1H)-thiones, 4H-Pyrans, and 1,3-Cyclohexadiene
作者:V. D. Dyachenko
DOI:10.1007/s11176-005-0247-5
日期:2005.3
Cyclocondensation of isovaleric aldehyde with various CH acids [benzoylacetonitrile, malononitrile, cyanothioacetamide, 4-hydroxycoumarin, resorcinol, 3-phenylpyrazol-5(1H)-one, 3-morpholinocrotonanilide] in the presence of amines yields isobutyl-substituted 4H-pyrans, 1,3-cyclohexadiene, and pyridine-2(1H)-thiones. The latter compounds were used in the synthesis of substituted 2-pyridino thioethers and thieno[2,3-b]pyridine.
异戊醛与各种 CH 酸[
苯甲酰乙腈、
丙二腈、
硫代
氰乙酰胺、
4-羟基
香豆素、
间苯二酚、
3-苯基吡唑-5(1H)-酮、3-吗啉基
巴豆酰
苯胺]在胺的存在下发生环缩合反应,产生异丁基取代的
4H-吡喃、
1,3-环己二烯和
吡啶-2(1H)-
硫酮。在胺的存在下,产生异丁基取代的 4H-pyrans 、
1,3-环己二烯和
吡啶-2(1H)-
硫酮。后一种化合物被用于合成取代的 2-
吡啶硫醚和
噻吩并[2,3-b]吡啶。