Selective Synthesis of 5‐Substituted
<i>N</i>
‐Aryloxazolidinones by Cycloaddition Reaction of Epoxides with Arylcarbamates Catalyzed by the Ionic Liquid BmimOAc
作者:Elnazeer H. M. Elageed、Bihua Chen、Binshen Wang、Yongya Zhang、Shi Wu、Xiuli Liu、Guohua Gao
DOI:10.1002/ejoc.201600474
日期:2016.7
5-substituted N-aryloxazolidinones in excellent yields. In addition, chiral 5-substituted oxazolidinones were synthesized by this procedure in good-to-excellent yields with enantiomeric excesses in excess of 99.9 % starting from chiral terminal epoxides. A possible reaction mechanism is discussed in accord with the results obtained by 1H NMR spectroscopy and DFT calculations, which indicate the cooperative activation
已开发出一种通过离子液体催化环氧化物与芳基氨基甲酸酯偶联合成 5-取代 N-芳基恶唑烷酮的选择性方法。考察了反应时间、反应物摩尔比、催化剂用量和温度的影响。在最佳反应条件下,与其他离子液体相比,BmimOAc 表现出有效的催化活性,导致以优异的产率形成 5-取代的 N-芳基恶唑烷酮。此外,手性 5-取代的恶唑烷酮是通过该程序以从手性末端环氧化物开始的对映体过量超过 99.9% 的良好收率合成的。根据1H NMR光谱和DFT计算得到的结果讨论了可能的反应机理,