An efficient protocol to annulate the 5,6-fused 2-pyridone ring system, exploiting a tandem condensation of propiolamide and cyclic β-keto methyl esters in water, followed by acid- or base-promoted intramolecular ring closure and decarboxylation, has been developed.
利用
丙炔酰胺和环δ-酮甲酯在
水中的串联缩合,然后在酸或碱的促进下进行分子内闭环和脱羧反应,开发出了一种环化 5,6-融合 2-
吡啶酮环系统的高效方案。