反应详情

温度

30 °C

To a solution of methyl 4-cyclobutylbenzoate (compound 168.1, 3.80 g, 20.0 mmol, 1.00 equiv) in acetic anhydride (12 mL) 0° C. was added dropwise fuming HNO3 (5 mL, 97%). The resulting mixture was stirred at 30° C. in an oil bath. After 2 h, 30 mL of water was carefully added and the mixture was extracted with 2×30 mL of ethyl acetate. The combined organic layers were washed with aqueous saturated NaHCO3 (note: gas evolution), dried over anhydrous sodium sulfate, and concentrated under reduced pressure. The residue was purified using silica gel column chromatography with ethyl acetate/petroleum ether (1:25) as eluent to furnish 3.00 g (64%) of the title compound as a light yellow oil.

1. extractionthe mixture was extracted with 2×30 mL of ethyl acetate
2. washThe combined organic layers were washed with aqueous saturated NaHCO3 (note: gas evolution)
3. dry with materialdried over anhydrous sodium sulfate
4. concentrationconcentrated under reduced pressure
5. customThe residue was purified