反应详情

温度

60 °C

A solution of methyl 4-bromo-3-hydroxy-2-nitrobenzoate (5.41 g, 19.6 mmol) and potassium carbonate (5.42 g, 39.2 mmol) in N,N-dimethylformamide (30 mL, 387 mmol) was treated with benzyl bromide (3.26 mL, 27.4 mmol) and stirred at 60° C. for 1 h. The reaction mixture was diluted with water (250 mL) and extracted with ethyl acetate (2×150 mL). The combined organic extracts were washed with brine, dried over sodium sulfate, filtered, and concentrated to give a crude tan oil. Purification by flash column chromatography (100% hexanes to 50% EtOAc/hexanes) gave the desired product (6.99 g, 97%) as a yellow solid. LCMS calculated for C15H16BrN2O5 (M+NH4)+: m/z=383.0, 385.0. found: 383.0, 385.0.

1. extractionextracted with ethyl acetate (2×150 mL)
2. washThe combined organic extracts were washed with brine
3. dry with materialdried over sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated
6. customto give a crude tan oil
7. customPurification by flash column chromatography (100% hexanes to 50% EtOAc/hexanes)