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Reagents and conditions: (a) 3, Pd2(dba)3, XPhos, Cs2CO3, dioxane/H2O, 90 °C, 16 h; (b) 4, Pd(PPh3)4, K2CO3, dioxane/H2O, 90 °C, 16 h; (c) Pd2(dba)3, XPhos, Cs2CO3, dioxane/H2O, 90 °C, 16 h; (d) aq NaOH, MeOH 75 °C, 1 h, then aq HCl.
