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Reagents and conditions: (a)448 CuI (40 mol %), 1,10-phenanthroline (80 mol %), K2CO3 (6 equiv), DMSO/H2O (20:1), air, 160 °C; (b) CuI (20 mol %), 1,10-phenanthroline (40 mol %), K2CO3 (3 equiv), DMSO/H2O (20:1), air, 160 °C.
