Hydrochloric Acid → Ethyl 2-(oxan-4-yl)propanoate

Temperature

-78 °C

Diisopropylamine (2.8 g) was dissolved in tetrahydrofuran (20 ml). A solution of n-butyllithium in hexane (2.64 N, 11 ml) was added dropwise under nitrogen atmosphere under ice-cooling, and the mixture was stirred at the same temperature for 15 minutes. The reaction solution was cooled to −78° C. A solution of ethyl 2-(tetrahydro-2H-pyran-4-yl)acetate (4.0 g) in tetrahydrofuran (15 ml) was added dropwise and the mixture was stirred at the same temperature for 15 minutes. Methyl iodide (2.2 ml) was subsequently added dropwise. The mixture was stirred at the same temperature for 10 minutes, and then warmed to room temperature and stirred for 3 hours. A 1 N aqueous hydrochloric acid solution was added under ice-cooling, followed by extraction with ethyl acetate. The organic layer was washed with a saturated aqueous sodium bicarbonate solution and brine and then dried over anhydrous sodium sulfate, and the solvent was evaporated. The residue was purified by silica gel column chromatography (developed with ethyl acetate-hexane) to give the title compound (4.0 g) as a colorless oil.

1. temperaturecooling
2. stirringthe mixture was stirred at the same temperature for 15 minutes
3. stirringThe mixture was stirred at the same temperature for 10 minutes
4. temperaturewarmed to room temperature
5. stirringstirred for 3 hours
6. temperaturecooling
7. extractionfollowed by extraction with ethyl acetate
8. washThe organic layer was washed with a saturated aqueous sodium bicarbonate solution and brine
9. dry with materialdried over anhydrous sodium sulfate
10. customthe solvent was evaporated
11. customThe residue was purified by silica gel column chromatography (developed with ethyl acetate-hexane)

ORD record

ord-e5a8a10a8ec94788bc29a29807d35696

Source dataset

uspto-grants-2013_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08436012B2