A new generation of terminal copper nitrenes and their application in aromatic C–H amination reactions
作者:Fabian Thomas、Matthias Oster、Florian Schön、Kai C. Göbgen、Benedikt Amarouch、Dominik Steden、Alexander Hoffmann、Sonja Herres-Pawlis
DOI:10.1039/d1dt00832c
日期:——
dichloromethane. We show that the ligand design has a major influence on the catalytic activity and the thermal stability of the copper nitrene complex. Not only the choice of the third N donor, but also the substituent in the 5-position of the pyrazolyl moiety, have an impact on the stability. Furthermore, the novel copper nitrene complexes were used for catalytic aziridination of styrenes and C–H
Additionally, the steric hindrance is easily defined in the ligands by the substitution of the pyrazole rings. By combination of the versatility in donor function and steric demand, a systematic tuning of the properties of the bis(pyrazolyl)methaneligands is possible. The synthesis and full characterization of 11 bis(pyrazolyl)methaneligands are reported. Two of these were structurally characterized