Sodium hydride → 2-(4-fluoro-2-methylphenyl)-4-(tetrahydro-2H-pyran-2-yloxy)butanenitrile

Temperature

0 °C

(4-Fluoro-2-methylphenyl)acetonitrile (6.0 g, 40 mmol), dissolved in THF (25 mL), was added to a suspension of NaH (2.1 g, 60% in mineral oil, 52 mmol) in THF (25 mL) under a stream of nitrogen. The mixture was then heated to reflux, which initiated the reaction. The reaction proceeded without external heating for 1 h whereupon the visual generation of gas ceased. The mixture was cooled and then 2-(2-bromoethoxy)tetrahydro-2H-pyran (10.9 g, 52 mmol), dissolved in THF (25 mL), was added. The mixture was stirred at 0° C. for 30 min and then at room temperature overnight. The mixture was poured over an aqueous solution of NH4Cl, which was extracted twice with ether. The combined organic solutions were dried over Na2SO4 and then the solvent was evaporated. The product was purified by chromatography on silica gel using CH2Cl2 and there was obtained 8.1 g (72%) of 2-(4-fluoro-2-methylphenyl)-4-(tetrahydro-2H-pyran-2-yloxy)butanenitrile as an oil. 1H NMR (300 MHz, CDCl3): 1.4-2.2 (m, 8H), 2.4 (s, 3H), 3.4-3.6 (m, 2H), 3.8-4.0 (m, 2H), 4.2 (m, 1H), 4.6 (m, 1H), 6.8-7.0 (m, 2H), 7.4 (m, 1H).

1. temperatureThe mixture was then heated
2. temperatureto reflux
3. customthe reaction
4. temperaturewithout external heating for 1 h whereupon the visual generation of gas
5. temperatureThe mixture was cooled
6. additionwas added
7. customat room temperature
8. customovernight
9. extractionwas extracted twice with ether
10. dry with materialThe combined organic solutions were dried over Na2SO4
11. customthe solvent was evaporated
12. customThe product was purified by chromatography on silica gel

ORD record

ord-1f888bad2f97491e8b37e5b255375d9c

Source dataset

uspto-grants-2008_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07402581B2