aThe structures of ligands and palladium catalysts are shown in Figure S1. DTI (41.3 mg, 0.1 mmol, 1 equiv.), [Pd] (3 mol%), ligand (12 mol%), base (3.0 equiv.), pivalic acid (1 equiv.), and 0.1 M of THF in 85°C, DMF in 110°C, toluene in 100°C. and o-xylene in 120°C. Isolated yield was obtained from column chromatography.