反应详情

温度

0 °C

2-Bromo-5-nitroaniline (10 g) was dissolved in 500 mL of CH2Cl2, DIEA (6.6 g) was added to the mixture, followed by DMAP (100 mg). The mixture was cooled to 0° C. in ice bath. Acetyl chloride (4 g in 50 mL CH2Cl2) was added dropwise to the reaction mixture. After the mixture was stirred at RT over 3 h, extracted once with saturated NaHCO3 solution and once with brine, the resulting organic layer was dried over MgSO4, filtered and concentrated in vacuo. The crude material was purified by flash chromatography on silica gel with 1:1 EtOAc:Hexane to 100% EtOAc to afford N-(2-bromo-5-nitrophenyl)acetamide as a white solid. MS: 258 (M−1). Calc'd. for C8H2BrN2O2—259.06.

1. extractionextracted once with saturated NaHCO3 solution and once with brine
2. dry with materialthe resulting organic layer was dried over MgSO4
3. filtrationfiltered
4. concentrationconcentrated in vacuo
5. customThe crude material was purified by flash chromatography on silica gel with 1:1 EtOAc