反应详情

To a solution of commercially available 8-methylquinoline (5.0 g, 34 mmol) in concentrated H2SO4 (19 mL) at 0° C. was added portionwise KNO3 (4.29 g, 42.4 mmol). After the addition, the reaction was stirred at rt for 17 h, then poured into ice/water and extracted with EtOAc (3×100 mL). The aqueous layer was basified to pH=9 with solid Na2CO3 and extracted with EtOAc (2×100 mL). The combined extracts were washed with brine, dried (Na2SO4), filtered and concentrated under reduced pressure. The residue was chromatographed (silica gel) to yield the title compound (5.98 g, 94%) as a light yellow solid. LC/MS m/z 189 [M+H]+.

1. additionAfter the addition
2. extractionextracted with EtOAc (3×100 mL)
3. extractionextracted with EtOAc (2×100 mL)
4. washThe combined extracts were washed with brine
5. dry with materialdried (Na2SO4)
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure
8. customThe residue was chromatographed (silica gel)