Table 2. Substrate Scope with Respect to the Indoles^a.

^aReaction conditions: 1a (0.4 mmol), 2 (0.4 mmol), B(C₆F₅)₃ (5 mol %), H₂O (2 mL), 60 °C, 2 h, under an air atmosphere. The isolated yield was based on 1a.