Fig. 3
From: External oxidant-free electrooxidative [3 + 2] annulation between phenol and indole derivatives
Synthesis of benzofuro[2,3-b]indolines from 2-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, 1a (0.20 mmol), 2a (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
