Carbon Dioxide → 6-Bromo-2,3,4-trifluorobenzoic acid

Temperature

-78 °C

To a solution of i-Pr2NH (3.65 mL, 25.8 mmol) in THF (50 mL) was added n-BuLi (10.3 mL, 25.8 mmol, 2.50 M solution in hexanes) at 0° C. After stirring for 15 minutes, the reaction mixture was cooled to −78° C. A solution of 5-bromo-1,2,3-trifluorobenzene (5.00 g, 23.7 mmol) in THF (5 mL) was added. The resulting mixture was stirred for 2 hours at −78° C., poured into an excess of freshly crushed dry ice, and stirred for 30 minutes To this mixture was added 10% aqueous HCl to adjust its pH to 1. The resulting mixture was extracted with ether (3×). The combined organic layers were washed with 5% aqueous NaOH (2×). The combined basic aqueous layers were acidified to pH 1 with concentrated HCl, and extracted with ether (2×). The combined organic layers were washed with water, dried over MgSO4, filtered, and concentrated in vacuo to give the desired product (5.06 g, 84%) that was used directly without further purification.

1. stirringThe resulting mixture was stirred for 2 hours at −78° C.
2. stirringstirred for 30 minutes To this mixture
3. extractionThe resulting mixture was extracted with ether (3×)
4. washThe combined organic layers were washed with 5% aqueous NaOH (2×)
5. extractionextracted with ether (2×)
6. washThe combined organic layers were washed with water
7. dry with materialdried over MgSO4
8. filtrationfiltered
9. concentrationconcentrated in vacuo

ORD record

ord-0fb60fc6d2624aeab3033aa613c1aab6

Source dataset

uspto-grants-2009_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07485643B2