Substrate scope^a.

^aReaction conditions: 1 (0.6 mmol), 2 (0.2 mmol), (DME)NiBr₂ (6 mol%), L1 (7.2 mol mol%), LutHClO₄ (0.1 M), and lutidine (0.8 mmol) in THF/CH₃CN (4 : 1, 2 mL) at 40 °C. Isolated yield.

^b(DME)NiBr₂ (5 mol%) and L1 (6 mol%) were used as the catalysts.

^cNi(acac)₂ was used instead of (DME)NiBr₂.

^dSolvent: THF/CH₃CN (3 : 1, 2 mL).

^e2 mmol toluene or its derivative was used as the substrate.

^fReaction time: 60 h.