Fig. 2
From: External oxidant-free electrooxidative [3 + 2] annulation between phenol and indole derivatives
Synthesis of benzofuro[3,2-b]indolines from 3-substituted N-acetylindoles. Reaction conditions: graphite rod anode (ϕ 6 mm), platinum plate cathode (15 mm × 15 mm × 0.3 mm), constant current = 10 mA (J ≈ 16.7 mA/cm2), 1 (0.20 mmol), 2 (0.30 mmol), nBu4NBF4 (0.20 mmol), HFIP/CH2Cl2 (6.0 ml/4.0 ml), room temperature, N2, 1.8 h (3.4 F). Isolated yields are shown
