Pyridine → 2-(3,4-Bisdifluoromethoxyphenyl)acetonitrile

Temperature

45 °C

A solution of 3,4-bisdifluoromethoxybenzyl alcohol (26.4 g, 110 mmol) and pyridine (9.79 mL, 120 mmol) in chloroform (200 mL) under an argon atmosphere was treated with thionyl chloride (9.62 mL, 130 mmol) and the mixture was heated at reflux for 1 h. The solvent was removed, ether was added and the precipitate was removed by filtration. The filtrate was concentrated to a purple oil. To a solution of this 3,4-Bisdifluoromethoxybenzyl chloride in dimethylflormamide (200 mL) under an argon atmosphere was added sodium cyanide (11.86 g, 240 mmol). The resulting mixture was stirred and gently heated at 45° C. for 3 h, was cooled and was concentrated. The mixture was partitioned between ether and 5% aqueous sodium carbonate and was extracted five times with ether. The organic extract was washed once with brine, was dried (sodium carbonate) and the solvent was removed in vacuo to provide an oil (27 g).

1. temperaturethe mixture was heated
2. temperatureat reflux for 1 h
3. customThe solvent was removed
4. additionether was added
5. customthe precipitate was removed by filtration
6. concentrationThe filtrate was concentrated to a purple oil
7. temperaturewas cooled
8. concentrationwas concentrated
9. customThe mixture was partitioned between ether and 5% aqueous sodium carbonate
10. extractionwas extracted five times with ether
11. extractionThe organic extract
12. washwas washed once with brine
13. dry with materialwas dried (sodium carbonate)
14. customthe solvent was removed in vacuo

ORD record

ord-ee09c7b60f554471b93c3c1c35cfd332

Source dataset

uspto-grants-1995_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05449686