反应详情

To a cold (0° C.) solution of 6-chloro-2-picoline (25.8 mL 236 mmol) and methyl 3-methyl-2-furoate (33.08 g, 236 mmol) in tetrahydrofuran (300 mL) was added lithium bis(trimethylsilyl)amide (472 mL, 1.0 M in tetrahydrofuran, 472 mmol) dropwise via a pressure equalizing funnel over 1 hour. Upon complete addition, the cold bath was removed and the resultant solution was stirred at room temperature for 15 hours. The solution was concentrated. Methanol was added to quench the reaction resulting in a yellow solid precipitating. The precipitate was collected by filteration and washed with a small amount of cold methanol. 2-(6-Chloro-2-pyridinyl)-1-(3-methyl-2-furyl)ethanone (52.2 g, 94%) was obtained as a yellow solid. 1H NMR (CDCl3): δ 7.61 (t, 1H), 7.43 (s, 1H), 7.23 (m, 2H), 6.40 (s, 1H), 4.36 (s, 2H), 2.37 (s, 3H). MS m/z 236 (M+1).

1. customover 1 hour
2. additionUpon complete addition
3. customthe cold bath was removed
4. concentrationThe solution was concentrated
5. additionMethanol was added
6. customto quench the reaction
7. customresulting in a yellow solid
8. customprecipitating
9. customThe precipitate was collected by filteration
10. washwashed with a small amount of cold methanol