Microwave-promoted direct amidation of unactivated esters catalyzed by heteropolyanion-based ionic liquids under solvent-free conditions
作者:Renzhong Fu、Yang Yang、Yunsheng Ma、Fei Yang、Jingjing Li、Wen Chai、Quan Wang、Rongxin Yuan
DOI:10.1016/j.tetlet.2015.05.118
日期:2015.7
A simple and efficient procedure for the synthesis of amides directly from unactivated esters and amines catalyzed by heteropolyanion-based ionic liquids under microwave-promoted and solvent-free conditions has been reported. The practical protocol was found to be compatible with different structurally diverse substrates. Moderate to excellent yields, solvent-free media, and operational simplicity are the main highlights. Furthermore, the heteropolyanion-based ionic liquids were easily reusable for this amidation. (C) 2015 Elsevier Ltd. All rights reserved.