Methyl iodide → HCID 57758723, compound

Temperature

-10 °C

To a solution of (3S,4S)-3-ethoxycarbonyl-4-fluoromethyl-1-[(1R)-1-phenylethyl]-2-pyrrolidone (8.30 g, 28.3 mmol) and iodomethane (2.47 mL, 39.6 mmol) in tetrahydrofuran (170 mL), potassium bistrimethylsilyl amide (67.9 mL, 34.0 mmol, 0.5M solution in toluene) was added at −78° C., and the mixture was stirred at the same temperature for 10 minutes. While stirring, the temperature was gradually increased to −10° C. in 30 minutes. Saturated aqueous solution of ammonium chloride (200 mL) was added to the reaction mixture, and the mixture was extracted with ethyl acetate (200 mL×2), and the organic layer was washed with saturated aqueous solution of sodium chloride (150 mL) and dried with anhydrous sodium sulfate. After filtration, the filtrate was concentrated under reduced pressure, and the residue was purified by silica gel column chromatography (elusion by hexane:ethyl acetate, 7:1→1:1) to obtain 7.91 g (91%) of the title compound as a pale yellow oily substance.

1. stirringWhile stirring
2. extractionthe mixture was extracted with ethyl acetate (200 mL×2)
3. washthe organic layer was washed with saturated aqueous solution of sodium chloride (150 mL)
4. dry with materialdried with anhydrous sodium sulfate
5. filtrationAfter filtration
6. concentrationthe filtrate was concentrated under reduced pressure
7. customthe residue was purified by silica gel column chromatography (elusion by hexane:ethyl acetate, 7:1→1:1)

ORD record

ord-a9d5ea2e71a34ee58282072f37ca5219

Source dataset

uspto-grants-2013_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08476429B2