Microwave-assisted zinc chloride-catalyzed synthesis of substituted pyrroles from homopropargyl azides
摘要:
Ligand-free 5-endo-dig cyclization of 1,4- and 1,2,4-substituted but-3-yn-1-yl (homopropargyl) azides in the presence of zinc chloride (usually 20 mol %) in dichloroethane at elevated temperature provides 2,5-di- and 2,3,5-trisubstituted pyrroles in high to moderate yields (91-41%). Both conventional and microwave protocols furnished comparable results. A structure of 2-(4-fluorophenyl)-5-(4-methyl-phenyl)-1H-pyrrole was confirmed by X-ray crystallography. (C) 2008 Elsevier Ltd. All rights reserved.