Hydrochloric Acid → 5-nitro-3-pyridin-2-yl-3,4-dihydro-2H-1,4-benzoxazine-3-carboxylic acid

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Reaction Conditions

Reaction Steps

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.

Provenance & Evidence