Palladium-catalyzed direct Hiyama arylation of quinoxalin-2(1H)-ones with aryl siloxanes in water

An efficient method for palladium-catalyzed direct Hiyama coupling of various quinoxalin-2(1H)-ones with aryl siloxanes has been developed. The protocol provides a convenient access to a variety of useful C3-arylated 1-methylquinoxalin-2(1H)-one derivatives in reasonable yields by using low cost water as a solvent and oxygen as an oxidant. (C) 2020 Published by Elsevier Ltd.