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Reaction conditions: 1n (0.50 mmol, 2.5 equiv), 2 (0.20 mmol, 1.0 equiv), 3a (0.40 mmol, 2.0 equiv), DMF (0.40 mL), 10 W blue LED, Ar, rt, 24 h; pinacol (0.80 mmol, 4.0 equiv), NEt3 (0.70 mL), 1 h, isolated yields.
1 mL of DMF was used.
