Ruthenium N‐Heterocyclic Carbene Complexes for Chemoselective Reduction of Imines and Reductive Amination of Aldehydes and Ketones
作者:Lakshay Kathuria、Ashoka G. Samuelson
DOI:10.1002/ejic.202000069
日期:2020.6.30
Chemoselective reduction of imines to secondary amines is catalyzed efficiently by tethered and untethered, half‐sandwich ruthenium N‐heterocyclic carbene (NHC) complexes at room temperature. The untethered Ru‐NHC complexes are more efficient as catalysts for the reduction of aldimines and ketimines than the tethered complexes. Using the best untethered complex as a catalyst, electronic and steric
在室温下,通过束缚和不束缚的半三明治钌N-杂环卡宾(NHC)络合物可有效催化亚胺化学选择性还原为仲胺。未束缚的Ru-NHC络合物比束缚的络合物作为减少醛亚胺和酮亚胺的催化剂更有效。使用最好的无束缚配合物作为催化剂,使用一系列亚胺探讨了对反应的电子和空间要求。通过以多种方式进行分子间和分子内竞争反应,测试了催化剂对亚胺还原的化学选择性。该催化剂在厌氧条件下具有很高的TON和TOF。