反应详情

3.0 g (9.58 mmol) of ethyl 1-[(3-methylisoxazol-5-yl)methyl]-2-oxo-1,2-dihydroquinoxaline-3-carboxylate and 0.46 g (11.5 mmol) of lithium hydroxide monohydrate were dissolved in a solvent mixture of ethanol (30 mL) and water (30 mL), and the solution was stirred for 2 hours at room temperature. The reaction solution was concentrated to a half the original volume, and water was added to the residue. The mixture was acidified using 10% hydrochloric acid, and then extracted with ethyl acetate. The organic layer was washed with water, dried over anhydrous sodium sulfate, and concentrated, to obtain 2.3 g (yield: 84%) of 1-[(3-methylisoxazol-5-yl)methyl]-2-oxo-1,2-dihydroquinoxaline-3-carboxylic acid as a white powder.

1. concentrationThe reaction solution was concentrated to a half the original volume, and water
2. additionwas added to the residue
3. extractionextracted with ethyl acetate
4. washThe organic layer was washed with water
5. dry with materialdried over anhydrous sodium sulfate
6. concentrationconcentrated