反应详情

温度

0 °C

A solution of anhydrous tetrahydrofuran (50 mL) and diisopropylamine (11 mL) was cooled to 0° C. and had 1.6 M n-butyl lithium/hexanes (47 mL) added drop wise under nitrogen balloon. The mixture was stirred for 10 minutes at 0° C. and was then cooled to −78° C. with an acetone dry ice bath. A mixture of 4-bromo-2-fluoro-1-methoxybenzene (7.9 mL, 61 mmol) in anhydrous tetrahydrofuran (50 mL) was added drop wise, under nitrogen balloon, to the reaction. The mixture was then allowed to stir for 30 minutes at −78° C. N,N-dimethylformamide (7.5 mL) was added drop wise at −78° C. under a nitrogen balloon. The reaction was stirred for 1 hour at room temperature under a nitrogen balloon. Half of the solvent from the solution was removed under reduced pressure and the solution was extracted using ethyl acetate, water (300 mL), and 1 M HCl (65 mL). The organic layer was washed with brine, dried over anhydrous sodium sulfate, and filtered. The solvent was removed under reduced pressure. The residue was crystallized by washing with hexanes. The solid was collected via filtration and dried under reduced pressure to give 6-bromo-2-fluoro-3-methoxybenzaldehyde (8.21 g, 58% yield).

1. additionadded drop wise under nitrogen balloon
2. temperaturewas then cooled to −78° C. with an acetone dry ice bath
3. additionwas added drop wise
4. customunder nitrogen balloon, to the reaction
5. stirringto stir for 30 minutes at −78° C
6. stirringThe reaction was stirred for 1 hour at room temperature under a nitrogen balloon
7. customHalf of the solvent from the solution was removed under reduced pressure
8. extractionthe solution was extracted
9. washThe organic layer was washed with brine
10. dry with materialdried over anhydrous sodium sulfate
11. filtrationfiltered
12. customThe solvent was removed under reduced pressure
13. customThe residue was crystallized
14. washby washing with hexanes
15. filtrationThe solid was collected via filtration
16. customdried under reduced pressure