反应详情

A solution of methyl iodide (633 uL, 10.2 mmol, 2.2 equiv), potassium carbonate (895 mg, 6.5 mmol, 1.4 equiv), and ethyl 4-(6-bromopyridin-3-yl)-2-(methylsulfonyl)butanoate (1620 mg, 4.6 mmol, 1.0 equiv) in DMF (15 mL) was allowed to stir at room temperature overnight. The reaction was diluted with 0.5 M hydrochloric acid (220 mL) and was extracted with ethyl acetate (3×80 mL). The combined organic layers were washed with water (170 mL) and sodium thiosulfate (170 mL, 10% aq. solution), dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure. The crude material was purified by flash chromatography on silica gel (7:3 heptane/ethyl acetate) to provide the title compound as a white solid (1107 mg, 66%). MS (LCMS) m/z 364.1 (M+1). 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 1.33 (t, J=7.22 Hz, 3H) 1.69 (s, 3H) 2.12-2.23 (m, 1H) 2.39-2.59 (m, 2H) 2.69-2.79 (m, 1H) 3.02 (s, 3H) 4.27 (qd, J=7.16, 2.73 Hz, 2H) 7.35-7.43 (m, 2H) 8.20 (d, J=1.95 Hz, 1H).

1. extractionwas extracted with ethyl acetate (3×80 mL)
2. washThe combined organic layers were washed with water (170 mL) and sodium thiosulfate (170 mL, 10% aq. solution)
3. dry with materialdried over anhydrous sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated under reduced pressure
6. customThe crude material was purified by flash chromatography on silica gel (7:3 heptane/ethyl acetate)