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Reaction conditions: a) boronic acid 15 (1.3 equiv), PdCl2(PPh3)2 (0.1 equiv), dioxane/H2O (3:1), Na2HPO4 (2.0 equiv), TEA (4.0 equiv), 90 °C, 15 h, 55% for 16 and 71% for 18; b) SeO2 , different conditions, 0%; c) SeO2 (2.0 equiv), dioxane, 110 °C, 12 h, 54%.
