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

Temperature

-74 °C

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.

1. temperatureto warm to 15° C. during a period of 2 h
2. temperatureAfter heating at 60° C. for 1 h
3. temperaturethe mixture was cooled to room temperature
4. extractionextracted with three 50-ml portions of diethyl ether
5. washThe combined organic layers were washed with 50 ml brine
6. dry with materialdried over sodium sulfate
7. concentrationconcentrated

ORD record

ord-c3613534dda64468916a2f21d2e80217

Source dataset

uspto-grants-2011_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07939533B2