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.
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