N-Arylimidazole synthesis by cross-cycloaddition of isocyanides using a novel catalytic system
作者:Marc-André Bonin、Denis Giguère、René Roy
DOI:10.1016/j.tet.2007.03.152
日期:2007.6
catalytic synthesis of N-arylimidazoles starting from the corresponding N-arylformamides and N-formylglycine esters is described. Application to different aryl substituted electron-withdrawing and -donating groups provided the analogous heterocycliccompounds in very high yields. The use of copper(I) oxide/proline catalysts allowed the reactions to proceed at room temperature. The first synthesis of N-arylimidazole
The copper-catalyzed reaction between two different isocyanides produces the corresponding heteroaromatization products, imidazoles, in good yields. The reaction proceeds most probably through the activation of the sp3 C-H bond in the isocyanides by a copper catalyst, followed by a [3 + 2] cycloaddition between the cuprioisocyanide intermediates and arylisocyanides.