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Reagents and conditions: (a)564 toluene, reflux, 8 h; (b) AIBN (2.2 equiv), Bu3SnH (0.5 equiv), toluene, 80 °C, 7 h; (c) AIBN (1.1 equiv), Bu3SnH (0.5 equiv), toluene, 80 °C, 4 h.
