Ammonium Chloride → 2-Fluoro-6-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)benzoic acid methyl ester

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Reaction Conditions

Reaction Steps

To a 500 mL round-bottomed flask were added 2-fluoro-6-iodo-benzoic acid methyl ester (7.29, 26.0 mmol) and anhydrous THF (150 mL). This mixture was cooled to 0° C. and i-PrMgCl (13.7 mL, 2 M in THF, 27.3 mmol) was added dropwise. After 10 min, 2-isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (5.58 mL, 27.3 mmol) was added. The mixture was allowed to warm to room temperature, and after 30 min NH4Cl(aq) (150 mL, 13 wt % solution) was added. The layers were mixed and then separated, and the aqueous layer was extracted with 100 mL of MTBE. The combined organic layers were dried over Na2SO4, filtered, and concentrated to a final mass of 6.07 g (90% wt %, 75% yield). 1H NMR (400 MHz, CDCl3): 7.47-7.38 (m, 2H), 7.17-7.11 (m, 1H), 3.92 (s, 3H), 1.36 (s, 12H).

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