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Reagents and conditions: (a) 3, Pd2(dba)3, XPhos, Cs2CO3, dioxane, H2O, 120 °C, 16 h; 17via (b) 4, Pd2(dba)3, XPhos, Cs2CO3, dioxane, H2O, 120 °C, 16 h; 18via (c) PdCl2(dppf)·CH2Cl2, Cs2CO3, dioxane, H2O, 80 °C, 16 h; (d) PhB(OH)2, Pd(PPh3)4, Cs2CO3, dioxane, H2O, 120 °C, 30 min, μW; (e) aq LiOH, dioxane, 100 °C, 16 h then aq HCl.
