反应详情

To 2-amino-3,6,7-trichloroquinoxaline (1.54 g, 6.20 mmol) dissolved in tetrahydrofuran (40 ml), 25 wt % sodium methoxide (2.01 g, 9.30 mmol) in methanol was added at room temperature and stirred further at room temperature for 1 hour. The resulting mixture was concentrated under the reduced pressure to remove the solvent. The product was extracted with ethyl acetate and the organic layer was washed with water and dried over MgSO4. After concentration under the reduced pressure, the crude product was purified by SiO2 column chromatography. Extraction of the residue with a n-hexane:ethyl acetate (2:1) mixture and concentration gave 1.21 g of the titled compound (yield, 80%).

1. concentrationThe resulting mixture was concentrated under the reduced pressure
2. customto remove the solvent
3. extractionThe product was extracted with ethyl acetate
4. washthe organic layer was washed with water
5. dry with materialdried over MgSO4
6. concentrationAfter concentration under the reduced pressure
7. customthe crude product was purified by SiO2 column chromatography
8. extractionExtraction of the residue
9. concentrationwith a n-hexane:ethyl acetate (2:1) mixture and concentration