N−H Imine as a Powerful Directing Group for Cobalt‐Catalyzed Olefin Hydroarylation
作者:Wengang Xu、Naohiko Yoshikai
DOI:10.1002/anie.201605877
日期:2016.10.4
N‐alkyl and N‐aryl imineshave been frequently used as directing groups in rhodium‐ and cobalt‐catalyzed hydroarylation reactions of olefins and alkynes. However, the scope of such hydroarylation reactions has been limited by the difficulty of preparation of sterically hindered imines by condensation, and also by the steric bulkiness of the iminegroup itself. Reported herein is that an N−H imine serves
We have developed an efficient and general synthesis of ynimines based on an oxidative cross-coupling between imines and alkynylcopper reagents. Upon simple addition of 1,2-dimethylimidazole in the presence of oxygen, these bench-stable, crystalline, and readily available polymeric compounds were found to be especially suitable reagents for the introduction of an alkynyl group into a wide range of ketimines at room temperature and under especially mild conditions.