Alcohol Amination Catalyzed by Copper Powder as a Self‐Supported Catalyst
作者:Yajuan Wu、Yongji Huang、Xingchao Dai、Feng Shi
DOI:10.1002/cssc.201801877
日期:2019.7.5
Catalytic alcohol amination is a sustainable reaction for N‐alkyl amine synthesis. Homogeneous and supported copper catalysts have long been studied for this reaction and have given some impressive results. In this study, copper powder is found to behave as an active catalyst for alcohol amination, giving better catalyticperformance than metal‐oxide‐supported nanocopper catalysts. Catalyst characterization
Treatment of N-arylisonicotinamides with trifluoromethanesulfonic anhydride triggers intramolecular nucleophilic attack of the aryl ring on the 4-position of the pyridinium intermediate. The products are spirocyclic dihydropyridines which can be converted to valuable spirocyclic piperidines related to biologically active molecules such as MK-677.
Synthesis of Benzidine Derivatives via FeCl<sub>3</sub>·6H<sub>2</sub>O-Promoted Oxidative Coupling of Anilines
Under open-flask conditions in the presence of commercially available FeCl3·6H2O, N,N-disubstituted anilines can be converted into diversely functionalized benzidines with yields of up to 99%. Oxidative coupling was extended to N-monosubstituted anilines, and the method was applied to the efficient preparation of 6,6′-biquinoline. Mechanistic investigations have also been performed to explain the observed