Efficient One-Pot Cross-Coupling of Two Aryl Halides by Stannylation/Stille Reaction in Water under Microwave Irradiation

A simple and highly efficient one-pot approach has been developed for the Pd(PPh3)(4)-catalyzed cross-coupling of two different aryl or heteroaryl bromides/iodides. This method involves the combined use of microwave irradiation and water as a single solvent to achieve sequential stannylation and Stille cross-coupling reactions, which allows rapid access to a wide variety of biaryls in good to high yields. Furthermore, utilizing this step-economical protocol, 2,5-dibromopyridine was iteratively diarylated and the Boscalid intermediate was also synthesized in a one-pot manner.