反应详情

To a solution of 4-bromo-2-fluoro-1-nitrobenzene (9.4 g, 42.7 mmol) in tetrahydrofuran (100 mL) were added methyl 3-amino-2-methylpropanoate (5 g, 42.7 mmol) and potassium carbonate (11.8 g, 85.4 mmol). The reaction mixture was stirred with refluxing for 3 hours. The mixture was diluted with water (100 mL), extracted with ethyl acetate (100 mL×3). The organic layers were separated, combined, dried over anhydrous sodium sulfate, filtered and concentrated to give a residue, which was purified by column chromatography (silica gel, petroleum ether/ethyl acetate=5:1) to give methyl 3-(5-bromo-2-nitrophenylamino)-2-methylpropanoate as a light yellow solid (8 g, 59%).

1. temperaturewith refluxing for 3 hours
2. extractionextracted with ethyl acetate (100 mL×3)
3. customThe organic layers were separated
4. dry with materialdried over anhydrous sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated
7. customto give a residue, which
8. customwas purified by column chromatography (silica gel, petroleum ether/ethyl acetate=5:1)