Hydrochloric Acid → HCID 13371325, compound

4-Fluorocinnamic acid (10 g) was dissolved in tetrahydrofuran (120 mL), triethylamine (10.12 mL) and ethyl chloroformate (6.92 mL) were added dropwise under ice-cooling, and the mixture was stirred for 1 hr. An aqueous solution (60 mL) of sodium tetrahydroborate (6.87 g) was added dropwise to the reaction solution, and the mixture was stirred at room temperature overnight. Aqueous hydrochloric acid solution (1 mol/L, 200 mL) was added, and the mixture was extracted with ethyl acetate. The organic layer was washed successively with saturated aqueous sodium hydrogen carbonate solution and water, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure, and the residue was purified by silica gel chromatography (elution solvent; hexane:ethyl acetate=5:1 to 1:1) to give the title compound (9.36 g) as a white solid.

1. temperaturecooling
2. stirringthe mixture was stirred at room temperature overnight
3. extractionthe mixture was extracted with ethyl acetate
4. washThe organic layer was washed successively with saturated aqueous sodium hydrogen carbonate solution and water
5. dry with materialdried over anhydrous sodium sulfate
6. customThe solvent was evaporated under reduced pressure
7. customthe residue was purified by silica gel chromatography (elution solvent; hexane:ethyl acetate=5:1 to 1:1)

ORD record

ord-0c161cb233f24d19973eca6752ceddf7

Source dataset

uspto-grants-2011_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08026370B2