Design, scope and mechanism of highly active and selective chiral NHC–iridium catalysts for the intramolecular hydroamination of a variety of unactivated aminoalkenes
Chiral, cationic NHC–iridium complexes are introduced as catalysts for the intramolecular hydroamination reaction of unactivated aminoalkenes. The catalysts show high activity in the construction of a range of 5- and 6-membered N-heterocycles, which are accessed in excellent optical purity, with various functional groups being tolerated with this system. A major deactivation pathway is presented and
引入手性阳离子 NHC-铱配合物作为未活化氨基烯烃分子内氢胺化反应的催化剂。该催化剂在构建一系列 5 元和 6 元 N 杂环时表现出高活性,这些杂环具有优异的光学纯度,并且该系统可以耐受各种官能团。通过使用替代反应条件呈现和消除主要的失活途径。对反应机理进行了详细的实验和计算研究,为催化系统的作用模式提供了有价值的见解,并指出了对该催化平台的未来修改。
Tartramide Ligands for Copper‐Catalyzed N‐Arylation at Room Temperature
作者:Xuerui Ma、Robert P. Davies
DOI:10.1002/adsc.202200174
日期:2022.6.21
the reaction rate in terms of impact of ligand structure, reactant/catalyst dependence and catalyst (in)stability. These kinetic insights have been used in a quality-by-design approach for further optimization of the reaction protocol. The reaction scope was extended to 22 examples, showing broad applicability for a wide range of substituted aryl iodides with both primary and secondaryamines.