Substrate scope with variation of quinoxalin-2(1H)-one and arylboronic acids.^a,b.

^aReaction conditions: a mixture of 1 (0.5 mmol), 4 (0.75 mmol), K₂S₂O₈ (1.5 mmol) and K₂CO₃ (0.5 mmol) in H₂O was stirred at 80 °C for 2–6 hours.

^bIsolated yield.