反应详情

To a solution of Ph2O (500 g) heated to 250° C. was added 108.7 g (392 mmol) of 5-[(3-Methoxyphenyl-amino)methylene]-2,2-dimethyl-[1,3]dioxane-4,6-dione in portions over a 30 min period. The mixture was heated an additional 15 min, cooled to rt, diluted with hexanes (800 mL) and the resulting slurry stirred overnite. The hexanes was decanted off, the solid residue dissolved in 600 mL of MeOH at reflux, cooled to rt and the resulting solid filtered and washed with minimal CH2Cl2. The analogous recrystallization procedure was followed to afford a total of 20.73 g (30%) of 7-methoxyquinolin-4-ol as a light brown solid. 1H NMR (methanol-d4) δ 3.87 (s, 3H), 6.23 d, J=7.3 Hz, 1H), 6.68 (d, J=2.4 Hz, 1H), 6.96 (dd, J=9.0, 2.4 Hz, 1H), 8.11 (d, J=9 Hz, 1H); LC-MS (retention time: 0.77, method D), MS m/z 176 (M++1).

1. temperatureThe mixture was heated an additional 15 min
2. customThe hexanes was decanted off
3. dissolutionthe solid residue dissolved in 600 mL of MeOH
4. temperatureat reflux
5. temperaturecooled to rt
6. filtrationthe resulting solid filtered
7. washwashed with minimal CH2Cl2
8. customThe analogous recrystallization procedure