A simple route for the synthesis of imidazole derivatives via copper-catalyzed [3 + 2] cycloaddition reaction is described. This strategy has achieved high regioselectivity and used oxygen as an oxidant without the addition of expensive catalysts to provide moderate to good yields.
An efficient and facile approach to synthesize imidazoles from amidines and arylketone via oxidative coupling of sp(3) C-H bond and N-H bond is reported. This strategy exhibits high performance in terms of regioselectivity with moderate to high yields by using easily available materials, and provides an alternative method to synthesize multi-substituted imidazole skeletons. (C) 2014 Elsevier Ltd. All rights reserved.
Iron(III)-Catalyzed Synthesis of 1,2,4-Trisubstituted Imidazoles through the Reactions of Amidines and Aldehydes in Air
AbstractA novel and efficient iron(III)‐catalyzed synthesis of 1,2,4‐trisubstituted imidazoles through the reactions of amidines and aldehydes in air has been developed. Five hydrogen dissociations involving CH and NH bond activation are realized under mild conditions in this approach. The procedure is sustainable, simple and environmentally friendly.magnified image
Iron(III)-catalyzed synthesis of multi-substituted imidazoles via [3+2] cycloaddition reaction of nitroolefins and N-aryl benzamidines
作者:Xiang Liu、Dong Wang、Baohua Chen
DOI:10.1016/j.tet.2013.08.077
日期:2013.11
A novel and efficient iron(III)-catalyzedsynthesis of multi-substituted imidazoles via [3+2] cycloaddition of nitroolefins and N-aryl benzamidines under the air atmosphere had been developed. This methodology is convenient, atom-economical, general, and eco-friendly in good yields and prefect regioselectivities.