Modular CeCl3·7H2O-catalyzed multi-component synthesis of 1,2,3,4-tetrasubstituted pyrroles under microwave irradiation and their further trichloroisocyanuric acid-mediated conversion into 5-sulfenylpyrrole derivatives
作者:Claudio C. Silveira、Samuel R. Mendes、Guilherme M. Martins、Sheila C. Schlösser、Teodoro S. Kaufman
DOI:10.1016/j.tet.2013.08.035
日期:2013.10
A modular, multicomponent synthesis of 1,2,3,4-tetrasubstituted pyrroles promoted by the inexpensive CeCl3 center dot 7H(2)O, is reported. The reaction was carried out under microwave irradiation, affording good yields of products in short time. Scope and limitations were explored and a plausible reaction mechanism is discussed. The resulting heterocycles were smoothly and efficiently converted into their corresponding 5-arylsulfenyl derivatives by reaction with diaryl disulfides and trichloroisocyanuric acid in EtOAc. (C) 2013 Elsevier Ltd. All rights reserved.