fig2

Figure 2. Scope of reaction. ^aReaction conditions: 1 (0.2 mmol), 2 (4.0 mmol), TBACl (2.0 equiv.) and FeCl₃ (10 mol%) in 2.0 mL of DCM and irradiated under 6 W 385 nm LEDs at room temperature for 13 h under air atmosphere. ^b1 equiv. TFA was added. TBACl: Tetrabutylammonium chloride; DCM: dichloromethane; LEDs: light-emitting diodes; TFA: trifluoroacetic acid.