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Reagents and conditions: (a)395 BBr3, NaBPh4, toluene, reflux, 18 h; (b) NBS, DCM/CHCl3/MeCN, 0 °C, 2 h; (c) B2pin2, KOAc, Pd(dppf)Cl2, 1,4-dioxane, 90 °C, 18 h; (d) Pd(PPh3)4, K2CO3, toluene/EtOH/H2O, reflux, 18 h; (e) degassed aq. H2SO4 (2 M), THF, 50 °C, 5 days.
