Hydrochloric Acid → 4-Fluoro-2-formylphenylboronic Acid (contains varying amounts of Anhydride)

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To a solution of 2.30 g (9.31 mmol) 2-(2-bromo-5-fluoro-phenyl)-[1,3]dioxolane in 15 ml tetrahydrofuran was added dropwise at −70° C. 6.11 ml (9.77 mmol) of a 1.6 M solution of n-butyllithium in hexane. The reaction mixture was stirred at −74° C. for 1 h. After dropwise addition of 2.65 ml (11.2 mmol) triisopropyl borate at −70° C. the reaction mixture was allowed to warm to 15° C. during a period of 2 h. Water (7 ml) was added, and the mixture was acidified to pH 1 by addition of 37% hydrochloric acid solution. After heating at 60° C. for 1 h, the mixture was cooled to room temperature and extracted with three 50-ml portions of diethyl ether. The combined organic layers were washed with 50 ml brine, dried over sodium sulfate and concentrated. Flash chromatography gave 1.2 g (77%) of the title compound as a light yellow liquid.

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