Design and Synthesis of a Palladium(II) Complex of a C<sub>NHC</sub>NN Pincer-Type <i>N</i>-Heterocyclic Carbene Ligand: Application towards the Oxidative Amidation of Aldehydes with 2-Aminopyridines
作者:Prakash N. Swami、Neha Meena、Hemant Joshi、Krishnan Rangan、Anil Kumar
DOI:10.1021/acs.organomet.3c00232
日期:2023.9.11
of a [CNHCNN]-pincer-type palladium(II) complex bearing a N-heterocyclic carbene (NHC)-derived pincer CNN ligand. The ligand and palladium pincer complex were characterized with the help of 1H, 13C1H} NMR, Fourier transform infrared (FTIR) spectroscopy, high-resolution mass spectrometry (HRMS), ultraviolet–visible (UV–vis) spectroscopy, and X-ray photoelectron spectroscopy (XPS) techniques. The coordination
该报告描述了[C NHC NN]-钳型钯(II)络合物的合成,该络合物带有N-杂环卡宾(NHC)衍生的钳式CNN配体。借助1 H, 13 C 1对配体和钯钳配合物进行了表征H} NMR、傅里叶变换红外 (FTIR) 光谱、高分辨率质谱 (HRMS)、紫外-可见 (UV-vis) 光谱和 X 射线光电子能谱 (XPS) 技术。使用单晶 X 射线衍射研究证实了配体与钯的配位模式。该复合体在钯中心周围具有扭曲的方形平面几何形状。Pd(II) 钳配合物用作醛与 2-氨基吡啶氧化酰胺化的催化剂。值得注意的是,在温和的反应条件下,仅需要 1.0 mol% 的催化剂负载量即可激活多种底物。该方案对多种官能团表现出优异的耐受性,酰胺化产物的产率从良好到非常高(高达 88%)。