Synthesis of 2,3,5,6-Tetrasubstituted Pyridines from Enamines Derived from N,N-Dimethylformamide Dimethyl Acetal
作者:Fathi A. Abu-Shanab、Alan D. Redhouse、J. Robin Thompson、Basil J. Wakefield
DOI:10.1055/s-1995-3954
日期:1995.5
Reactions of 1,3-dicarbonyl compounds with N,N-dimethylformamide dimethyl acetal, followed by cyanothioacetamide or cyanoacetamide and sodium hydride, then acidification, give 5,6-disubstituted 3-cyanopyridine-2(1H)-thiones or 5,6-disubstituted 3-cyanopyridin-2(1H)-ones 4. Analogous reactions with the malono-nitrile dimer give 5,6-disubstituted 3-cyano-2-(dicyanomethylene)-1,2-dihydropyridines 9.
1,3-二羰基化合物与N,N-二甲基甲酰胺二甲基缩醛反应,再与氰基硫代乙酰胺或氰基乙酰胺与氢化钠反应,然后酸化,得到5,6-二取代的3-氰基吡啶-2(1H)-硫酮或5,6-二取代的 3-氰基吡啶-2(1H)-酮 4. 与丙二腈二聚体进行类似反应,得到 5,6-二取代的 3-氰基-2-(二氰基亚甲基)-1,2-二氢吡啶 9。