Citation:
	            
		            Mahmoud.  Abd, El  Aleem. Ali, Ali.  El-Remaily. Bismuth triflate: A highly efficient catalyst for the synthesis of bio-active coumarin compounds via one-pot multi-componentreaction[J]. Chinese Journal of Catalysis,
							;2015, 36(7): 1124-1130.
						
							doi:
								10.1016/S1872-2067(14)60308-9
						
					
				
					
				
	        
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	                	A series of coumarin-chalcone hybrid compounds and coumarins linked to pyrazoline was synthesized in good yield and short time using a simple and efficient method. This method involved the one-pot reaction of salicylaldehyde, an α-ketoester and an aromatic aldehyde (in the case of the coumarin-chalcone derivatives) in addition to hydrazine hydrate (in the case of the pyrazolyl coumarins) in the presence of a catalytic amount of bismuth triflate [Bi(OTf)3, 5 mol%]. The synthesized compounds showed scavenging activity towards the free radical 2,2-diphenyl-1-picrylhydrazyl. All compounds were characterized using IR, 1H NMR and 13C NMR spectroscopy.
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