Triisopropyl borate → 2,3-Difluoro-4-(5,5,6,6,7,7,8,8,8-nonafluoro-octyloxy)-phenylboronic Acid

To a solution 2,3-difluoro-1-iodo-4-(5,5,6,6,7,7,8,8,8-nonafluoro-octyloxy)-benzene (10A) (1 equi.) in THF (5 mL/mmole), butyllithium (1.3 equi.) was added at −78 C. The reaction mixture was stirred at that temperature for 2 hr,. Then triisopropylborate (1 equi.) was added at that temperature. The reaction mixture was stirred at that temperature for 1 h and at room temperature for 10 h, quenched with water, extracted with ethyl acetate washed with brine, dried over MgSO4, and concentrated in vacuo. Purification by recrystallization from hexane afforded 2,3-difluoro-4-(5,5,6,6,7,7,8,8,8-nonafluoro-octyloxy)-phenylboronic acid (11A), as a white solid (75%).

1. stirringThe reaction mixture was stirred at that temperature for 1 h and at room temperature for 10 h
2. customquenched with water
3. extractionextracted with ethyl acetate
4. washwashed with brine
5. dry with materialdried over MgSO4
6. concentrationconcentrated in vacuo
7. customPurification
8. customby recrystallization from hexane

ORD-Eintrag

ord-10b1b9bf35734e5bb865fa88f20a46f0

Quelldatensatz

uspto-grants-2004_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06703082B1