Ethanol → Benzoic acid, 2,6-difluoro-, ethyl ester

Temperature

0 °C

2,6-Difluorobenzoyl chloride was diluted with CH2Cl2 (5 ml) and cooled to 0° C. A mixture of EtOH (1.2 ml, 20 mmol) and pyridine (1.6 ml, 20 mmol) was added, dropwise, over 5 minutes to the reaction mixture. The ice bath was removed after 5 minutes and the reaction mixture stirred at 25° C. for 45 min. The solvent and volatiles were evaporated under reduced pressure and the residue was partitioned between 1N HCl and EtOAc (10 ml each). The aqueous phase was separated and extracted with 2×7 ml EtOAc. The combined organic extracts was washed with NaHCO3 (10 ml), brine (7 ml), dried over MgSO4 and concentrated to give 1.562 g ethyl 2,6-difluorobenzoate as an almost colorless oil. (84% yield from steps B and C).

1. additionwas added
2. customThe ice bath was removed after 5 minutes
3. customThe solvent and volatiles were evaporated under reduced pressure
4. customthe residue was partitioned between 1N HCl and EtOAc (10 ml each)
5. customThe aqueous phase was separated
6. extractionextracted with 2×7 ml EtOAc
7. washThe combined organic extracts was washed with NaHCO3 (10 ml), brine (7 ml)
8. dry with materialdried over MgSO4
9. concentrationconcentrated

ORD record

ord-3d6ce06931e845109b8cc4b68bd5942c

Source dataset

uspto-grants-2001_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06265428B1