Palladium_Catalysts_for_Suzuki_Coupling_Reactions |
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李景阳 |
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李景阳 |
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简体中文 |
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2007-10-5 22:35:34 |
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Palladium_Catalysts_for_Suzuki_Coupling_ReactionsHighlyActivePalladiumCatalystsforSuzukiCouplingReactions + + § JohnP.Wolfe, RobertA.Singer, BryantH.Yang, andStephenL.Buchwald* ContributionfromtheDepartmentofChemistry,MassachusettsInstituteofTechnology, Cambridge,Massachusetts02139 ReceiedJune22,1999 Abstract: Mixturesofpalladiumacetateand o-(di-tert-butylphosphino)biphenyl(4) catalyze the room- temperatureSuzukicouplingofarylbromidesandarylchlorideswith0.51.0mol%Pd.Useof o-(dicyclohexylphosphino)biphenyl(2) allows Suzuki couplings to be carried out at low catalyst loadings (0.0000010.02mol%Pd).Theprocesstoleratesabroadrangeoffunctionalgroupsandsubstratecombinations includingtheuseofstericallyhinderedsubstrates.Thisisthemostactivecatalystsystemintermsofreaction temperature,turnovernumber,andsterictolerancewhichhasbeenreportedtodate. |
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