反应详情

温度

100 °C

5-Nitro-3-pyridin-2-yl-3,4-dihydro-2H-1,4-benzoxazine-3-carbonitrile (80 mg, 0.3 mmol) was dissolved in concentrated hydrochloric acid (3 mL, 100 mmol) and heated to 100° C. for 2 h. The reaction was allowed to cool to room temperature, diluted with water, and the pH was adjusted to pH 7 with sodium bicarbonate. The neutralized solution was then extracted with ethyl acetate. The combined organic layers were washed with brine, dried over magnesium sulfate, and concentrated to give crude 5-nitro-3-pyridin-2-yl-3,4-dihydro-2H-1,4-benzoxazine-3-carboxylic acid as a solid (0.025 g. 30%). LCMS calculated for C14H12N3O5 (M+H)+: m/z=302.1. found: 301.9.

1. temperatureto cool to room temperature
2. extractionThe neutralized solution was then extracted with ethyl acetate
3. washThe combined organic layers were washed with brine
4. dry with materialdried over magnesium sulfate
5. concentrationconcentrated