Superacidic Activation ofα,β-Unsaturated Amides and Their Electrophilic Reactions
作者:Konstantin Yu. Koltunov、Stéphane Walspurger、Jean Sommer
DOI:10.1002/ejoc.200400313
日期:2004.10
The electrophilic reactivity of α,β-unsaturated amides towards weak nucleophiles such as arenes and cyclohexane, initiated either with triflic acid (CF3SO3H) or with excess AlCl3, has been studied. The amides generally condense readily with aromatics in the presence of AlCl3 to give 3-arylpropionamides and related compounds in excellent yields, while some amides also undergo selective ionic hydrogenation
已经研究了用三氟甲磺酸 (CF3SO3H) 或过量 AlCl3 引发的 α,β-不饱和酰胺对弱亲核试剂如芳烃和环己烷的亲电反应性。在 AlCl3 存在下,酰胺通常很容易与芳烃缩合,以极好的收率得到 3-芳基丙酰胺和相关化合物,而一些酰胺也可以与环己烷进行选择性离子氢化,得到饱和酰胺。这些反应的拟议机制涉及双阳离子中间体(超亲电试剂)。报告了对双阳离子物质的直接观察(通过低温 NMR)。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)