N-heterocyclic carbene sulfonamide palladium complexes and their catalytic activities in Suzuki-Miyaura coupling reaction

Novel N-heterocyclic carbene sulfonamide ligands derived from binaphthyl-2,2'-diamine (BINAM) and their tridentate NHC-Pd(II) complexes as well as their corresponding NHC-Pd(II) complexes bearing weakly coordinating acetate counterions have been successfully synthesized in good yields. These NHC-palladium(II) complexes have been characterized by X-ray crystal structure diffraction. Moreover, we found that these NHC-Pd(II) complexes bearing weakly coordinating acetate counterions are quite effective in Suzuki-Miyaura coupling reaction to give the corresponding products in good to excellent yields in most cases at room temperature in 2-propanol in the presence of sodium tert-butoxide.