<i>p</i>-Toluenesulfonic Acid Promoted Annulation of 2-Alkynylanilines with Activated Ketones: Efficient Synthesis of 4-Alkyl-2,3-Disubstituted Quinolines
作者:Changlan Peng、Yong Wang、Lanying Liu、Honggen Wang、Jiaji Zhao、Qiang Zhu
DOI:10.1002/ejoc.200901257
日期:2010.2
Reactions between readily available 2-alkynylanilines and activated ketones such as β-keto esters promoted by p-toluenesulfonic acid afford 4-alkyl-2,3-disubstituted quinolines in good to excellent yields. The generality of substituents at the other end of the triple bond of 2-alkynylanilines makes the method a valuable approach to diversified 4-alkylquin-olines, which are difficult to obtain by classical
容易获得的 2-炔基苯胺和活化酮(如由对甲苯磺酸促进的 β-酮酯)之间的反应以良好至极好的收率提供 4-烷基-2,3-二取代喹啉。2-炔基苯胺三键另一端取代基的普遍性使该方法成为一种有价值的方法,可以通过经典方法如弗里德兰德反应难以获得多样化的4-烷基喹啉。喹啉二聚体可以使用 C-4 处的烷基或芳基接头有效地制备。