Table 3. Selected Results for a Simple Practical Synthesis of a Variety of Benzoxazole Derivatives Using Azide–Isocyanide Coupling Catalyzed by a Phenothiazine-Derived Mesoionic Singlet Carbene Palladium (4) Complex^a,b.

^aReaction conditions: azide (0.369 mmol), isocyanide (0.443 mmol), complex 4 (0.003 mmol, 1 mol %), and K₂CO₃ (1.10 mmol) in 5.0 mL of toluene at 50 °C for 12 h.

^bIsolated yields (%).