Methyl iodide → HCID 57758720, compound

To a solution of ethyl(3R,4R)-4-fluoromethyl-3-methyl-2-oxo-1-[(1R)-1-phenylethyl]pyrrolidine-3-carboxylate (33.4 g, 114 mmol) and iodomethane (9.94 mL, 159 mmol) in tetrahydrofuran (670 mL), potassium bistrimethylsilyl amide (274 mL, 137 mmol, 0.5M solution in toluene) was added at −78° C., and the mixture was stirred at the same temperature for 10 minutes. The temperature was gradually increased in 30 minutes with stirring to −10° C., and saturated aqueous solution of ammonium chloride (700 mL) was added to the reaction mixture. The mixture was extracted with ethyl acetate (700 mL×2), and the organic layer was washed with saturated aqueous solution of sodium chloride (500 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 29.1 g (83%) of the title compound as a pale yellow oily substance.

1. temperatureThe temperature was gradually increased in 30 minutes
2. stirringwith stirring to −10° C.
3. extractionThe mixture was extracted with ethyl acetate (700 mL×2)
4. washthe organic layer was washed with saturated aqueous solution of sodium chloride (500 mL)
5. dry with materialdried with anhydrous sodium sulfate
6. filtrationAfter filtration
7. concentrationthe filtrate was concentrated under reduced pressure
8. customthe residue was purified by silica gel column chromatography (elusion by hexane:ethyl acetate, 7:1→1:1)

ORD record

ord-0f76348675f147148409824eb8bbe07c

Source dataset

uspto-grants-2009_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07563805B2