Table 2. Cu-Catalyzed Coupling and Cyclization of 1 with 2 Leading to 3^a.

^aReaction conditions: 1 (0.3 mmol), 2 (0.6 mmol) CuI (0.03 mmol), l-proline (0.09 mmol), Cs₂CO₃ (0.9 mmol), and DMF (3 mL). Condition A: 110 °C, 24 h. Condition B: 130 °C, 1 h, under microwave irradiation (100 W of initial power).