“…After exploring the reaction parameters such as solvents, copper sources, bases, and the corresponding proportions (Table S2, SI) we established the optimized reaction conditions as consisting of 5 mol% of PSAP (30 mg, size > 100 mesh) and 5 mol% of CuI, aryl bromides (100 mol%), amines (150 mol%) and K 3 PO 4 (200 mol%) in diethylene glycol (DEG) at 70 °C (Table S2, SI, entry 31). As expected, this heterogeneous catalyst system was almost the same as our previously reported homogeneous counterpart 19 except for the need for higher reaction temperature.…”