Scheme 4: Investigation scope of the substrate.

Reaction conditions: substrate 1 (0.2 mmol), 2 (0.4 mmol, 2.0 equiv), Pd(OAc)₂ (10 mol%), P(m-MeO-C₆H₄)₃ (20 mol%), NBE (0.2 mmol, 1.0 equiv), K₂CO₃ (0.8 mmol, 4.0 equiv), PivOH (0.1 mmol, 0.5 equiv), toluene (2.0 mL), 120 °C, Ar. Isolated yields.