Pyridinyl-triazole ligand systems for highly efficient CuI-catalyzed azide-alkyne cycloaddition
作者:Lei Zheng、Ye Wang、Xianggao Meng、Yunfeng Chen
DOI:10.1016/j.catcom.2020.106165
日期:2021.1
N1/N2-substituted 2-(NH-1,2,3-triazol-4-yl)pyridines) were found to be superior ligands for CuI-catalyzed azide-alkyne cycloaddition (CuAAC) reactions. Low catalyst loadings, short reaction times, facile catalyst recyclability, ambient temperature, and open-flask conditions made this catalytic system very practical. The iodide anions could form iodine bridges to construct stable dinuclear Cu(I) complexes with these
吡啶基-三唑配体系统(包括N 2 -2-吡啶基1,2,3-三唑和N 1 / N 2取代的2-(NH(1,2,3-三唑-4-基)吡啶被发现是CuI催化的叠氮化物-炔烃环加成(CuAAC)反应的优良配体。催化剂负载量低,反应时间短,催化剂易于回收利用,环境温度和开瓶条件使该催化系统非常实用。碘化物阴离子可形成碘桥,与这些配体一起构建稳定的双核Cu(I)配合物,这是实现高催化活性的关键。虽然CuBr和CuCl不适合该配体系统,因为Br和Cl原子的尺寸不合适,无法形成相应的双核Cu(I)配合物。