Silica gel supported TaBr_5:new catalyst for the facile and rapid cyclization of 2 -aminochalcones to the corresponding 2-aryl-2,3-dihydroquinolin-4(1H)-ones under solvent-free conditions

摘要

Silica gel supported TaBr_5 (5-10 mol %) is a new solid-support catalyst that can be used under solvent-free conditions for the facile and efficient isomerization of 2'-aminochalcones to the corresponding 2-aryl-2,3-dihydroquinolin-4(1H)-ones.The catalyst is easily prepared,stable and employed under environmentally friendly conditions.