Ethyl Acetate → Methyl 2-cyano-4-fluorobenzoate

Temperature

195 °C

A 100-mL single-neck round-bottomed flask equipped with a magnetic stirrer was purged with nitrogen and charged with methyl 2-chloro-4-fluorobenzoate (10.0 g, 53.0 mmol), copper (I) cyanide (5.22 g, 58.3 mmol) and 2-methylpyrrolidinone (30 mL). After heating at 195° C. for 1.5 h, the reaction mixture was cooled to room temperature and poured into water (600 mL). The resulting suspension was filtered, and the filter cake was washed with water (100 mL). To the solid obtained was then added a solution of sodium cyanide (3.00 g, 61.2 mmol) in water (110 mL), and the reaction mixture was stirred at room temperature for 50 min. After this time, ethyl acetate (500 mL) was added, and the layers were separated. The aqueous phase was extracted with ethyl acetate (2×10 mL), and the organic extracts were combined, dried over sodium sulfate, filtered and concentrated under reduced pressure. The resulting residue was purified by flash chromatography to afford 123a in 73% yield (6.99 g) as a white solid: mp 92-93° C.; 1H NMR (500 MHz, CDCl3) δ 8.18 (dd, 1H, J=9.0, 5.5 Hz), 7.50 (dd, 1H, J=8.0, 2.5 Hz), 7.38 (m, 1H), 4.01 (s, 3H).

1. customA 100-mL single-neck round-bottomed flask equipped with a magnetic stirrer
2. customwas purged with nitrogen
3. temperaturethe reaction mixture was cooled to room temperature
4. filtrationThe resulting suspension was filtered
5. washthe filter cake was washed with water (100 mL)
6. customTo the solid obtained
7. customthe layers were separated
8. extractionThe aqueous phase was extracted with ethyl acetate (2×10 mL)
9. dry with materialdried over sodium sulfate
10. filtrationfiltered
11. concentrationconcentrated under reduced pressure
12. customThe resulting residue was purified by flash chromatography

ORD record

ord-94e07aff4ecd47ed859e4095f4f64323

Source dataset

uspto-grants-2016_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09249123B2