Picolinamides as Effective Ligands for Copper-Catalysed Aryl Ether Formation: Structure-Activity Relationships, Substrate Scope and Mechanistic Investigations
作者:Carlo Sambiagio、Rachel H. Munday、Stephen P. Marsden、A. John Blacker、Patrick C. McGowan
DOI:10.1002/chem.201404275
日期:2014.12.22
picolinic acid amide derivatives as an effective family of bidentate ligands for copper‐catalysed aryl ether synthesis is reported. A fluorine‐substituted ligand gave good results in the synthesis of a wide range of aryl ethers. Even bulky phenols, known to be very challenging substrates, were shown to react with aryl iodides with excellent yields using these ligands. At the end of the reaction, the first
据报道,将吡啶甲酸酰胺衍生物用作铜催化的芳基醚合成的有效二齿配体家族。氟取代的配体在多种芳基醚的合成中均获得了良好的结果。使用这些配体,即使是众所周知的非常具有挑战性的底物,即使是笨重的酚也可以与芳基碘化物反应,收率极高。在反应结束时,分离出了报废的铜物种的第一个实例,并将其鉴定为Cu II与几种测试的阴离子配体的配合物。据报道,初步的机械研究表明,配体上的取代基可能在决定金属中心的氧化还原特性以及因此决定其在偶联过程中的效力方面起着至关重要的作用。了解这些影响对于开发用于铜基化学的新型高效且可调节的配体至关重要。