Triisopropyl borate → (4-Methoxy-2-methylphenyl)boronic acid

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A solution of 4-bromo-3-methylanisole (7, 92 g, 0.457 mol) in anhydrous THF (400 ml) was treated dropwise with a solution of n-butyl lithium (2.5 M solution in hexane, 201 mL, 0.503 mol, 1.1 equiv) in hexane at −60-−65° C. under N2. The resulting reaction mixture was stired at −60-−65° C. for an additional 30 min before being treated dropwise with B(OiPr)3 (94.56 g, 116 mL, 0.503 mol, 1.1 equiv) at −60-−65° C. The reaction mixture was stirred at −60-−65° C. for an additional 1 h. The reaction was then quenched with saturated NH4Cl aqueous solution (400 mL) at −60-−65° C., and the resulting mixture was gradually warmed to 0° C. for 1 h and subsequently to room temperature. The two layers were separated, and the aqueous layer was extracted with EtOAc/THF (1:1, 200 mL). The combined organic extracts were then washed with H2O (200 mL), and saturated NaCl aqueous solution (200 mL), dried over MgSO4, and concentrated in vacuo. The residual white solids were then suspended in heptane (400 mL), and the resulting suspension was stirred at room temperature for 30 min. The solids were collected by filtration and washed with heptane (2×100 mL), dried in vacuo at 40-45° C. for overnight. The crude product (8, 57.9 g, 75.86 g theoretical, 76.3%) was obtained as a white powder.

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