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.
We have successfully developed the I2-catalysed synthesis of substituted imidazole derivatives from amidines and ketones in good to excellent yields and 100% regioselectivity.
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.