Fig. 6. Synthesis of benzo[b]phosphole oxides by radical cyclization of 3.
Reaction conditions: 3 or 4 (0.10 mmol, 1.0 equiv), 8-hydroxyquinoline (0.02 mmol, 20 mol%), Cs2CO3 (0.2 mmol, 2.0 equiv), DMF (2.0 mL), 110 °C, 12 h. Isolated yield.
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