2,4-Difluorobenzaldehyde → 4-Fluoro-2-(methylthio)benzaldehyde

Temperature

80 °C

To a solution of 2,4-difluorobenzaldehyde (3.0 g, 21.1 mmol, CAS RN 1550-35-2) in toluene (29 mL) was added sodium thiomethoxide (2.03 g, 28.9 mmol) and the resulting suspension was stirred at 80° C. for 7 hours. Heating was removed and stirring continued at room temperature for another 18 hours. The reaction mixture was treated with diethyl ether (50 mL) and water (15 mL) and the layers were separated. The aqueous layer was extracted twice with ethyl acetate (50 mL each). The organic layers were washed with saturated aqueous sodium hydrogencarbonate solution and with brine, dried over magnesium sulfate, filtered and evaporated. The residue was dissolved in 50 mL n-heptane and 50 mL diethyl ether and the clear solution was evaporated slowly until a turbid solution formed. The originally oily precipitation turned into a white solid which was filtered, washed with n-heptane and dried under high vacuum to give the compound as a colourless solid (1.35 g, 37%). MS (ESI+): m/z=170.0 ([M+H]+).

1. temperatureHeating
2. customwas removed
3. stirringstirring
4. waitcontinued at room temperature for another 18 hours
5. additionThe reaction mixture was treated with diethyl ether (50 mL) and water (15 mL)
6. customthe layers were separated
7. extractionThe aqueous layer was extracted twice with ethyl acetate (50 mL each)
8. washThe organic layers were washed with saturated aqueous sodium hydrogencarbonate solution and with brine
9. dry with materialdried over magnesium sulfate
10. filtrationfiltered
11. customevaporated
12. dissolutionThe residue was dissolved in 50 mL n-heptane
13. custom50 mL diethyl ether and the clear solution was evaporated slowly until a turbid solution
14. customformed
15. customThe originally oily precipitation
16. filtrationwas filtered
17. washwashed with n-heptane
18. customdried under high vacuum

ORD record

ord-e6d736ca674c4e2baa589c7e3e184780

Source dataset

uspto-grants-2014_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08765730B2