反应详情

温度

-78 °C

1.6 M Solution of n-butyllithium in hexanes (3.35 mL, 5.36 mmol) was added dropwise to a solution of N,N-diisopropylamine (0.960 mL, 6.85 mmol) in tetrahydrofuran (10 mL) at −78° C. and the resultant reaction mixture was stirred at −78° C. for 10 min. A solution of 1-bromo-4-fluoro-2-methoxybenzene (1.0 g, 4.9 mmol) in tetrahydrofuran (2 mL) was added to the reaction mixture dropwise at −78° C. and the reaction mixture was stirred at −78° C. for 1 h. N,N-dimethylformamide (0.412 mL, 5.32 mmol) was added to the reaction mixture dropwise at −78° C. and the reaction mixture was stirred at −78° C. for 1 h. Reaction mixture was quenched with saturated ammonium chloride, warmed to 20° C., and diluted with ether and 1M aqueous solution of HCl. Layers were separated and the aqueous layer was and re-extracted with ether. The combined organic layers were washed with brine, dried with magnesium sulfate, filtered, and concentrated in vacuo to give a crude residue. Purification by flash column chromatography (100% hexanes to 30% EtOAc/hexanes) gave the desired product (727 mg, 64%) as a yellow solid. LCMS calculated for C8H7BrFO2 (M+H)+: m/z=233.0, 235.0. found: 233.0, 234.8.

1. customthe resultant reaction mixture
2. stirringthe reaction mixture was stirred at −78° C. for 1 h
3. stirringthe reaction mixture was stirred at −78° C. for 1 h
4. customReaction mixture
5. customwas quenched with saturated ammonium chloride
6. temperaturewarmed to 20° C.
7. additiondiluted with ether and 1M aqueous solution of HCl
8. customLayers were separated
9. extractionre-extracted with ether
10. washThe combined organic layers were washed with brine
11. dry with materialdried with magnesium sulfate
12. filtrationfiltered
13. concentrationconcentrated in vacuo
14. customto give a crude residue
15. customPurification by flash column chromatography (100% hexanes to 30% EtOAc/hexanes)