A variety of 5-cyano-4-methylthio-6-oxo-1,6-dihydropyridine-3-carboxylates have been efficiently synthesized in a one-pot reaction from N-alkyl and N-aryl derivatives of 2-cyano-3,3-bis(methylthio)acrylamides and selected β-keto esters. The reaction proceeds via potassium hydrogen carbonate mediated conjugate addition of a β-keto ester to 2-cyano-3,3-bis(methylthio)acrylamide followed by loss of methyl
一锅反应中,由2-cyano-3的N-烷基和N-芳基衍
生物有效合成了多种5-
氰基-4-甲
硫基-6-氧代-1,6-
二氢吡啶-3-
羧酸酯, 3-双(甲
硫基)
丙烯酰胺和某些β-
酮酯。反应通过
碳酸氢钾介导的β-
酮酯向2-
氰基-3,3-双(甲
硫基)
丙烯酰胺的共轭加成而进行,接着是
甲硫醇的损失,接着酰胺基与酰基羰基的分子内缩合。通过分离2-乙酰基-4-
氰基-5-
氨基-3-(甲
硫基)-5-氧opent-3-烯酸酯中间体并将其独立环化为所需的6-oxo-1,已经建立了反应机理。 ,6-
二氢吡啶。