Fig. 2: Catalytic cycles and reaction parameters evaluation.

a Proposed catalytic cycles. b Investigation of reaction parameters, standard conditions: 1a (0.6 mmol, 3.0 equiv), 2a (0.2 mmol, 1.0 equiv), Fe(OAc)2 (15 mol%), Cu(acac)2 (15 mol%), Et3N (0.5 equiv), TBABF4 (1.2 equiv), DMF (4.0 mL), carbon felt as the anode, RVC as the cathode, undivided cell, I = 2.5 mA, 6 W LEDs (390 nm), N2, 20 °C, 15 h. bYield determined by 1H NMR. cIsolated yield.