Hydrogen Peroxide → 3-Fluoro-2-(trifluoromethyl)phenol

A solution of 3-fluoro-2-(trifluoromethyl)bromobenzene (1 g, 4.1 mmol) in tetrahydrofuran (25 mL) was added dropwise to nbutyl lithium (2.5M in hexanes, 3.2 mL, 8 mmol), at −78° C., and the mixture was stirred at this temperature for 30 minutes. Trimethyl borate (1.84 mL, 16.4 mmol) was added and the reaction mixture was stirred at −78° C. for a further 30 minutes and at room temperature for 18 hours. 2M sodium hydroxide solution (4 mL) and 35% hydrogen peroxide solution (2 mL) were then added and the mixture was heated under reflux for 3 hours. The reaction mixture was cooled to room temperature and diluted with diethyl ether (100 mL). The aqueous layer was separated and the organic solution was washed with 2M sodium hydroxide solution. The combined basic washings were acidified with 2M hydrochloric acid, extracted with diethyl ether (2×50 mL) and the organic solution was concentrated in vacuo to afford the title compound as a yellow oil in 40% yield, 300 mg. 1H NMR (400 MHz, CD3OD) δ: 6.64 (m, 1H), 6.75 (d, 1H), 7.36 (q, 1H)

1. stirringthe reaction mixture was stirred at −78° C. for a further 30 minutes and at room temperature for 18 hours
2. temperaturethe mixture was heated
3. temperatureunder reflux for 3 hours
4. customThe aqueous layer was separated
5. washthe organic solution was washed with 2M sodium hydroxide solution
6. extractionextracted with diethyl ether (2×50 mL)
7. concentrationthe organic solution was concentrated in vacuo

ORD-Eintrag

ord-8303374ce4f94dacbacce728b95bd680

Quelldatensatz

uspto-grants-2015_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09023872B2