Abstract
Three new palladium catalysts, prepared via reactions of PdCl2 with readily obtained and inexpensive dicationic imidazolium salts, have been developed for the Suzuki reaction. The pre-catalyst was formed in situ using the imidazolium ligand, base and Pd metal precursor in 1,4-dioxane. This palladium catalyst provides a convenient and general method for the synthesis of biaryls from aryl bromides, activated aryl chlorides and arylboronic acids containing electron-withdrawing substituents and electron-donating groups (19 examples) in aqueous DMF under aerobic conditions (all 26 examples). Three new palladium catalysts made from PdCl2 and readily obtained inexpensive dicationic imidazolium salts have been developed for the Suzuki reaction. This palladium catalyst provides a convenient and general method to prepare biaryls from aryl bromides, activated aryl chlorides and arylboronic acids containing electron-withdrawing substituents and electron-donating groups (19 examples, all 26 examples) in aqueous DMF under air.
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