A highly efficient catalytic system for microwave-assisted Suzuki-Miyaura reactions as well as room temperature homocoupling reactions of arylboronic acids in aqueous media

摘要

An in situ generated catalytic system derived from PdCl2 and (C6H5)3CNH2 shows good-to-excellent activity (upto 92% isolated yield) in the microwave-assisted Suzuki-Miyaura cross-coupling reactions of aryl halides with arylboronic acids in aqueous media. Both electron-donating and electron-withdrawing aryl bromides can be efficiently coupled with arylboronic acids. Chloroarenes can also be coupled, but much lower yields are obtained. Interestingly, the same catalytic system is also found to be effective for homocoupling reactions of arylboronic acids in water. Moderate-to-excellent yields of symmetrical biphenyl compounds can be achieved at room temperature.