反应详情

温度

-30 °C

4-Bromo-3-methyl-benzoic acid methyl ester (6 g, 26.19 mmol) was dissolved into anhydrous tetrahydrofuran (THF) (200 mL) and then cooled to −30° C. while stirring under nitrogen. N,O-dimethylhydroxylamine hydrochloride (3.81 g, 39.29 mmol) was then added to the solution in one portion. Isopropyl magnesium chloride (39 mL, 2M soln. in THF, 78.6 mmol) was slowly added to the cooled suspension over 1 h. After complete consumption of starting material, then 30% solution of ammonium chloride was added with stirring. The reaction was diluted with diethyl ether and extracted. The organic layer was collected and washed with cold water (2×) and brine. The solution was then dried over anhydrous sodium sulfate, filtered, and concentrated. The 4-Bromo-N-methoxy-3,N-dimethyl-benzamide (5.94 g, 23.05 mmol) was obtained in purified form after flash column chromatography.

1. customAfter complete consumption of starting material
2. addition30% solution of ammonium chloride was added
3. stirringwith stirring
4. additionThe reaction was diluted with diethyl ether
5. extractionextracted
6. customThe organic layer was collected
7. washwashed with cold water (2×) and brine
8. dry with materialThe solution was then dried over anhydrous sodium sulfate
9. filtrationfiltered
10. concentrationconcentrated