反应详情

(4-Cyano-3-fluoro-phenyl)-acetic acid methyl ester (3.06 g, 15.84 mmol) was dissolved in anhydrous tetrahydrofuran (60 mL) and cooled in a dry ice-acetone bath. Lithium bis(trimethylsilyl)amide (1.0 M in tetrahydrofuran, 17.42 mL) was added under a nitrogen atmosphere. The solution was stirred for 1 h, at which point methyliodide (4.91 mL) was added dropwise. The reaction was allowed to warm to ambient temperature while stirring. Upon reaction completion satd. aq. ammonium chloride (100 mL) was added and the bulk of the tetrahydrofuran evaporated under a nitrogen stream. The aqueous layer was then extracted with ethyl acetate (3×300 mL). The combined organics were dried over magnesium sulfate, filtered, and concentrated in vacuo. The crude was purified by silica gel chromatography with ethyl acetate:hexanes (3:17) to give the title compound (1.73 g).

1. temperaturecooled in a dry ice-acetone bath
2. additionwas added dropwise
3. customUpon reaction completion
4. customthe bulk of the tetrahydrofuran evaporated under a nitrogen stream
5. extractionThe aqueous layer was then extracted with ethyl acetate (3×300 mL)
6. dry with materialThe combined organics were dried over magnesium sulfate
7. filtrationfiltered
8. concentrationconcentrated in vacuo
9. customThe crude was purified by silica gel chromatography with ethyl acetate:hexanes (3:17)