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Substrate scope study by using various aryl formates a,b. a The reactions were performed at 80 °C for 12 h under nitrogen atmosphere by using 1a (0.5 mmol), 2b–r (1.0 mmol), Pd(OAc)2 (5 mol%), XantPhos (5 mol%), and Et3N (1.0 mmol) in anhydrous DMF (2 mL). b Isolated yield.
