Oxygen-atom insertion of NHC–copper complex: The source of oxygen from N,N-dimethylformamide
摘要:
An unprecedented protocol for oxygen-atom insertion reaction of NHC-copper complexes has been developed by employing N,N-dimethylformamide as the oxygen source, which allows the preparation of imidazolinones from carbene complexes and decodes one of the mysterious transformations of NHC-metal complexes as well. (C) 2013 Elsevier B.V. All rights reserved.
Synthesis of Imidazolidinone, Imidazolone, and Benzimidazolone Derivatives through Oxidation Using Copper and Air
作者:Dazhi Li、Thierry Ollevier
DOI:10.1021/acs.orglett.9b00973
日期:2019.5.17
synthetic method of urea derivativesusing copper and air was developed. These mild conditions provided moderate to very good yields for 15 examples (53–93%), while low yields were obtained with sterically hindered substrates (3 examples). The reaction was found to go through an in situ generated copper–N-heterocyclic carbene, which was then oxidized into cyclic urea derivatives possessing alkyl, benzyl
Mechanism studies of oxidation and hydrolysis of Cu(I)–NHC and Ag–NHC in solution under air
作者:Dazhi Li、Thierry Ollevier
DOI:10.1016/j.jorganchem.2019.121025
日期:2020.1
The decomposition of copper(I)–NHC and silver-NHC complexes in solution under air was studied. The Cu(I)–NHCs were oxidized into urea derivatives and hydrolysed into imidazoliums or benzimidazoliums. The decomposition of Ag–NHC with a saturated backbone led to ring-opening product, while the Ag–NHC with an unsaturated backbone led to imidazolium and Ag-bisNHC complex. The effects of steric property