反应详情

温度

-78 °C

N-(2-Bromo-6-fluorophenyl)pivalamide (25.5 mmol, 7.0 g) was dissolved in tetrahydrofuran (200 mL). Mixture was cooled to −78° C. 2M Butyllithium in cyclohexane (62.0 mmol, 31.0 mL) was added to the mixture drop-wise. Reaction mixture was held at −78° C. for 30 minutes. A solution of N,N-dimethylformamide (129 mmol, 10.0 mL) in tetrahydrofuran (30 mL) was added to the reaction mixture drop-wise. Reaction was held at −78° C. for 30 minutes. Reaction was quenched with aqueous ammonium chloride then the mixture was allowed to warm to room temperature. Mixture was extracted 2× ethyl acetate. Combined organic layers were dried (magnesium sulfate), filtered and concentrated. Silica gel chromatography afforded the desired product as white solid in 80% yield. 1H NMR (300 MHz, CDCl3): δ=9.93 (d, J=1.83, 1H), 9.14 (bs, 1H), 7.56-7.50 (m, 1H), 7.42-7.25 (m, 2H), 1.34 (s, 9H). MS m/e (M+H)+=224.2.

1. customReaction mixture
2. customReaction
3. waitwas held at −78° C. for 30 minutes
4. customReaction
5. customwas quenched with aqueous ammonium chloride
6. temperatureto warm to room temperature
7. extractionMixture was extracted 2× ethyl acetate
8. dry with materialCombined organic layers were dried (magnesium sulfate)
9. filtrationfiltered
10. concentrationconcentrated