Synthesis of 2-Keto-imidazoles Utilizing <i>N</i>-Arylamino-Substituted N-Heterocyclic Carbenes
作者:Tryfon Zarganes-Tzitzikas、Constantinos G. Neochoritis、Julia Stephanidou-Stephanatou、Constantinos A. Tsoleridis
DOI:10.1021/jo102244x
日期:2011.3.4
A new method for the synthesis of 2-aroyl-, 2-heteroaroyl-, and 2-cinnamoyl-substituted imidazoles in very good yields has been developed. The reaction employs novel nitrogen heterocyclic carbenes (NHCs), namely, N-arylamino-substituted NHCs, formed in situ from the corresponding imidazolium salts, and subsequent reaction with aromatic, heteroaromatic, and cinnamic aldehydes without utilizing transition metals or expensive specialized catalysts.