Highly Active, Well-Defined (Cyclopentadiene)(N-heterocyclic carbene)palladium Chloride Complexes for Room-Temperature Suzuki-Miyaura and Buchwald-Hartwig Cross-Coupling Reactions of Aryl Chlorides and Deboronation Homocoupling of Arylboronic Acids

摘要

A new class of well-defined N-heterocyclic carbene (NHC)-(cyclopentadiene)palladium chloride complexes such as CpPd(NHC)Cl wasw synthesized from the readily available starting NHC-palladi-um(II) chloride dimers. These air-stable, coordina-tively saturated NHC-Pd complexes bearing the cy-clopentadiene (Cp) unit exhibit high catalytic activity in the room temperature Suzuki-Miyaura and Buch- wald-Hartwig cross-coupling reactions involving un-active aryl chlorides as the substrates. In addition, they are found to be extremely efficient catalysts in the deboronation homocoupling of arylboronic acids at room temperature.