Open-air N-arylation of N–H heterocycles with arylboronic acids catalyzed by copper(II) Schiff base complexes
作者:S. M. Islam、Ram Chandra Dey、Anupam Singha Roy、Sumantra Paul、Sanchita Mondal
DOI:10.1007/s11243-014-9881-2
日期:2014.11
Two copper Schiff base complexes, in both homogeneous and heterogeneous forms, were prepared and characterized by using elemental analysis, FTIR, UV–Vis spectroscopy and scanning electron microscopy. The catalytic performances of these complexes were studied in the N-arylation of N–H heterocycles with arylboronic acids in methanol without any added base at 40 °C under open air. The effects of various parameters such as solvent and temperature on the reaction system were studied. The reaction is applicable to a wide variety of N–H heterocycles and arylboronic acids. The heterogeneous catalyst was recovered by simple filtration, and reusability experiments showed that this catalyst can be used five times without much loss in the catalytic activity.
两种铜席夫碱配合物,无论是均相还是非均相形式,均通过元素分析、FTIR、UV–Vis光谱和扫描电子显微镜进行了制备和表征。这些配合物在40 °C、无任何添加碱、常压下于甲醇中对N-H杂环与苯硼酸的N-芳基化反应中的催化性能得到了研究。探讨了溶剂和温度等各种参数对反应体系的影响。该反应适用于多种N-H杂环和苯硼酸。非均相催化剂通过简单过滤回收,重复使用性实验表明,该催化剂可连续使用五次而催化活性无明显降低。