Scheme 1. Control experiments on the reaction mechanism. Condition A: 1m or 5 (0.3 mmol), Pd(OPiv)2 (0.036 mmol), L2 (0.12 mmol), Cu(O2CnPr)2 (0.36 mmol), Ag2CO3 (0.6 mmol), CsOPiv (0.36 mmol), MeCN (1.5 mL), heptane (1.5 mL), air (1 atm), 130 °C, 15 h. Condition B: 1m or 5 (0.3 mmol), Pd(MeCN)2Cl2 (0.06 mmol), L2 (0.12 mmol), Cu(OAc)2·H2O (0.09 mmol), Ag2CO3 (0.6 mmol), KOPiv (0.09 mmol), MeCN (2.0 mL), air (1 atm), 130 °C, 1 h.
