An efficient synthesis of 2-amino-4H-chromene derivatives is achieved via one pot three component coupling reaction of aromatic aldehyde, active methylene compound and activated phenol in presence of silica gel supported polyamine heterogeneous catalyst. The catalyst is easily prepared, highly stable, simple to handle and recycled for several times without significant loss of activity. (C) 2013 Elsevier B.V. All rights reserved.
K2CO3/cyanuric acid catalyzed synthesis of 2-amino-4H-chromene derivatives in water
Abstract Three-component processes for the synthesis of 2-amino-4H-chromenes catalyzed by potassium carbonate/cyanuric acid in water as a safe solvent were developed. These reactions were performed at room temperature through one-pot reactions. The benefits of this research are short reaction time, excellent yield, clean reaction media, simple work-up and easy purification. Graphical Abstract