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催化学报  2015 

Bismuthtriflate:Ahighlyefficientcatalystforthesynthesisofbio-activecoumarincompoundsviaone-potmulti-componentreaction

DOI: 10.1016/S1872-2067(14)60308-9, PP. 1124-1130

Keywords: Coumarin,Chalcone,Pyrazoline,One-potmulti-componentreaction,Salicylaldehyde,α-Ketoester,Bismuthtriflate[Bi(OTf)3]

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Abstract:

?Aseriesofcoumarin-chalconehybridcompoundsandcoumarinslinkedtopyrazolinewassynthesizedingoodyieldandshorttimeusingasimpleandefficientmethod.Thismethodinvolvedtheone-potreactionofsalicylaldehyde,anα-ketoesterandanaromaticaldehyde(inthecaseofthecoumarin-chalconederivatives)inadditiontohydrazinehydrate(inthecaseofthepyrazolylcoumarins)inthepresenceofacatalyticamountofbismuthtriflate[Bi(OTf)3,5mol%].Thesynthesizedcompoundsshowedscavengingactivitytowardsthefreeradical2,2-diphenyl-1-picrylhydrazyl.AllcompoundswerecharacterizedusingIR,1HNMRand13CNMRspectroscopy.

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