Microwave-promoted N-arylation of imidazole and amino acids in the presence of Cu2O and CuO in poly(ethylene glycol)
作者:A. A. Yakushev、A. D. Averin、E. Colacino、F. Lamaty、I. P. Beletskaya
DOI:10.1007/s11172-016-1442-8
日期:2016.5
Copper(I)-catalyzed N-arylation of imidazole with iodobenzene, its derivatives, and bromobenzene in poly(ethylene glycol) under microwave irradiation was studied. The influence of the following factors on the yield of arylation product was investigated: the nature of the source of copper and ligand, type of poly(ethylene glycol) (PEG) used, and substituents in iodoarene. An optimal catalytic system was selected:
研究了铜 (I) 催化咪唑与碘苯、其衍生物和溴苯在微波辐射下在聚乙二醇中的 N-芳基化。研究了以下因素对芳基化产物产率的影响:铜源和配体的性质、所用聚乙二醇 (PEG) 的类型以及碘芳烃中的取代基。选择了最佳催化体系:CuO/l-Hys/Cs2CO3/PEG-400,证明了含铜催化剂循环利用的可能性。研究了使用 Cu2O/Cs2CO3/PEG-400 催化和微波辐射对八种天然氨基酸进行 N-芳基化,发现了反应结果对温度、过程持续时间和起始试剂比例的依赖性。在亮氨酸、缬氨酸、