1-Bromo-4-fluorobenzene → (5-Bromo-2-fluorophenyl)boronic acid

Temperatur

-78 °C

A cooled (−20° C.) solution of 2,2,6,6-tetramethylpiperidine (28 ml, 165 mmol) in tetrahydrofuran (400 ml) was treated with n-butyllithium (63 ml of a 2.5M solution in hexanes, 157.5 mmol). This mixture was then cooled to −78° C. 1-Bromo-4-fluorobenzene (16.5 ml, 150 mmol) was then added neat and dropwise over 10 min and stirring at −78° C. was continued for 3 h. Triisopropyl borate (40 ml, 172.5 mmol) was then added and stirring at −78° C. continued for 30 min before removing the cooling bath. When the internal temperature of the reaction reached −40° C., 5N hydrochloric acid was added (75 ml) and the mixture was stirred to ambient temperature. After stirring at ambient temp for 1 h the majority of the tetrahydrofuran was removed and the mixture partitioned between ether (500 ml) and 1N hydrochloric acid (500 ml). The organics were then extracted with 2N sodium hydroxide (400 ml) and the organics were discarded. The aqueous was cooled in an ice-water bath and 5N hydrochloric acid (150 ml) was added dropwise over 15 min. The resulting white solid was collected and dried under vacuum to afford 5-bromo-2-fluorobenzeneboronic acid (25 g, 76%).

1. stirringstirring at −78° C.
2. waitcontinued for 30 min
3. custombefore removing the cooling bath
4. customreached −40° C.
5. addition5N hydrochloric acid was added (75 ml)
6. stirringthe mixture was stirred to ambient temperature
7. stirringAfter stirring at ambient temp for 1 h the majority of the tetrahydrofuran
8. customwas removed
9. customthe mixture partitioned between ether (500 ml) and 1N hydrochloric acid (500 ml)
10. extractionThe organics were then extracted with 2N sodium hydroxide (400 ml)
11. temperatureThe aqueous was cooled in an ice-water bath
12. addition5N hydrochloric acid (150 ml) was added dropwise over 15 min
13. customThe resulting white solid was collected
14. customdried under vacuum

ORD-Eintrag

ord-38cc190c1ffa4f93926931c22cd8b549

Quelldatensatz

uspto-grants-2009_02

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07485640B2