Intramolecular 1,6-Addition to 2-Pyridones. Mechanism and Synthetic Scope.
作者:Timothy Gallagher、Ian Derrick、Patrick M. Durkin、Claire A. Haseler、Christoph Hirschhäuser、Pietro Magrone
DOI:10.1021/jo100514a
日期:2010.6.4
2-pyridone moiety, a reaction that has found application in the synthesis of the lupin alkaloids, have been probed. This nucleophilic addition process has been shown to be reversible and favored in the case of (less stabilized) amide and lactam enolates, which readily form five- and six-membered bi-/tricyclic products. Alternative enolates (ketone, ester, thiolactam) and a variety of different acceptors (isoquinolinone
探究了在2-吡啶酮部分中烯醇化物的分子内1,6-加成的范围和局限性,该反应已发现在羽扇豆生物碱的合成中得到应用。已经证明这种亲核加成过程是可逆的,并且在(稳定性较差的)酰胺和内酰胺烯酸酯(易于形成五元和六元双/三环产物)的情况下受到青睐。已评估了备选的烯醇化物(酮,酯,硫代内酰胺)和各种不同的受体(异喹啉酮,嘧啶酮,吡嗪酮,吡啶并吡嗪酮),并使用包括原位红外在内的多种技术鉴定和表征了一系列竞争性副反应。