Triisopropyl borate → 2-(Trifluoromethoxy)phenylboronic Acid (contains varying amounts of Anhydride)

n-Butyllithium (5.9 ml, 9.5 mmol) was added to a solution of 1-bromo-2-(trifluoromethoxy)benzene (2 g, 8.2 mmol) in tetrahydrofuran (28 ml) at −78° C. and stirred for 45 minutes. Triisopropyl borate (2.58 ml, 11.1 mmol) was added dropwise to the reaction mixture and the solution was slowly brought to room temperature over 16 hours. The reaction mixture was quenched with water, made basic with 2N NaOH and extracted with ethyl acetate. The aqueous solution was acidified with 2N HCl, stirred for 1 hour at room temperature and extracted into ethyl acetate. The organic layer was washed with water, brine solution and dried over sodium sulfate. It was filtered and concentrated to give the product (1.10 g, 65%) as a white solid.

1. waitthe solution was slowly brought to room temperature over 16 hours
2. customThe reaction mixture was quenched with water
3. extractionextracted with ethyl acetate
4. stirringstirred for 1 hour at room temperature
5. extractionextracted into ethyl acetate
6. washThe organic layer was washed with water, brine solution
7. dry with materialdried over sodium sulfate
8. filtrationIt was filtered
9. concentrationconcentrated

ORD-Eintrag

ord-41a0f08520bb40a6aeb54dd67026c9ca

Quelldatensatz

uspto-grants-2009_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07589116B2