Lactate-Based Ionic Liquid Catalyzed Reductive Amination/Cyclization of Keto Acids under Mild Conditions: A Metal-Free Route To Synthesize Lactams
作者:Cailing Wu、Hongye Zhang、Bo Yu、Yu Chen、Zhengang Ke、Shien Guo、Zhimin Liu
DOI:10.1021/acscatal.7b02231
日期:2017.11.3
lactate, [BMIm][Lac]) catalyzed reductive amination/cyclization of keto acids using triethoxysilane as a reducing agent, which provides a metal-free route to synthesis of lactams under mild conditions, even at room temperature. [BMIm][Lac] combined with (EtO)3SiH afforded a series of five- and six-membered lactams in good to excellent yields at 80 °C within 1 h, showing comparable performance to the best
特定任务的离子液体(ILs)在催化中显示出有希望的应用。本文中,我们介绍了使用三乙氧基硅烷作为还原剂的基于乳酸的IL(例如,乳酸1-丁基-3-甲基咪唑鎓乳酸[BMIm] [Lac])催化酮酸的还原胺化/环化反应,提供了无金属的合成途径适量的内酰胺即使在室温下也是如此。[BMIm] [Lac]与(EtO)3 SiH结合,可在80°C下于1小时内以优异的产率获得一系列五元和六元内酰胺,其性能可与迄今为止报道的最佳金属基催化剂相媲美。机理研究表明,ILs(例如[BMIm] [Lac])用作多功能催化剂,可以活化氢硅烷并同时催化胺与LA的环化反应。