反应详情

To a stirred suspension of dimethyl 7-chloro-4-hydroxyquinoline-2,3-dicarboxylate (0.500 g, 1.69 mM) in ethanol (17mL) was added 4-methoxyphenyl hydrazine hydrochloride (2.07 g, 11.83 mM). Triethylamine (1.88 mL, 13.52 mM) was added, and the mixture was heated to reflux for 40 hours. The resulting suspension was filtered hot, and the collected solids were washed with ethanol to give the 4-methoxyphenyl hydrazine salt of the title compound (0.700 g) as a light tan solid. This material was heated to reflux in glacial acetic acid (20 mL) for 2 hours to give a brown suspension. The suspension was cooled to room temperature. The solids were collected and washed with glacial aceticacid, methanol and ether to give the title compound (0.331 g, 53%) as a tanpowder, mp 365° C. (decomp.); MS(CI): 370 (M+H). Analysis for C18H12ClN3O4 : Calculated: C, 58.50; H, 3.27; N, 11.36; Found: C, 58.29; H, 3.41; N, 11.14; NMR: 13.79 (br s, 1H, exchangeable), 8.22 (br d, J=8.70 Hz, 2H, 1H exchangeable), 7.88 (d, J=1.79 Hz, 1H), 7.57 (dd, J=1.79, 8.70 Hz, 1H), 6.78 (s, 4H), 3.67 (s, 3H).

1. temperaturethe mixture was heated
2. temperatureto reflux for 40 hours
3. filtrationThe resulting suspension was filtered hot
4. washthe collected solids were washed with ethanol