Palladium Complexes with N,<scp>O‐Bidentate</scp> Ligands Based on <scp><i>N</i>‐Oxide</scp> Units from Cyclic Secondary Amines: Synthesis and Catalytic Application in <scp>Mizoroki‐Heck</scp> Reaction
作者:Xuefeng Jia、Yanyan Wen、Changhui He、Xianqiang Huang
DOI:10.1002/cjoc.202300375
日期:2024.2
ions were presented as counter anions in complex II. But the palladium(II) center of IV was coordinated by nitrogen and oxygen atoms from one ligand (L4) as well as two chlorine atoms, which exhibited the nearly square-planar geometry. The study on catalytic properties of palladium complexes revealed that complex II exhibited high activity superior to the other complexes. The coupling reactions of
钯催化的 Mizoroki-Heck 反应是构建 C sp2 –C sp2键的强大而有效的方法。本文轻松合成了四种基于环状仲胺N-氧化物单元的带有 N,O-二齿配体 ( L 1 - L 4 ) 的钯配合物 ( I — IV ) ,并成功应用于芳基溴与电子的 Mizoroki-Heck 反应-缺乏的烯烃。X射线衍射分析表明II的钯(II)原子具有扭曲的正方形平面几何形状,并且由来自两个配体( L 2 )的氮和氧原子进行四配位。配合物II中存在两个游离氯离子作为抗衡阴离子。但IV的钯(II)中心由一个配体( L 4 )的氮原子和氧原子以及两个氯原子配位,呈现出接近正方形的平面几何形状。对钯配合物催化性能的研究表明,配合物II表现出优于其他配合物的高活性。一系列芳基溴和烯烃衍生物的偶联反应在2-5 mol%钯配合物II存在下进行,以良好至优异的产率得到所需产物。该方法具有官能团相容性好、产率高、