反应详情

A stirred mixture of diethyl 4-hydroxy-6-nitroquinoline-2,3-dicarboxylate (4.4 g, 13 mM), powdered iron (6.6 g, 118 mM) and glacial acetic acid (18.5 g, 307 mM) in ethanol (80 mL) was refluxed for 20 hr under a nitrogen atmosphere. The reaction mixture was cooled and filtered and the filtrate was concentrated. The dark residue was chromatographed (eluant: methylene chloride/methanol; 98/2) over silical gel to provide (3.01 g, 75.3%) the title compound as light orange crystals, mp 219°-221° C.; MS(CI): 305 (M+H).

1. temperaturewas refluxed for 20 hr under a nitrogen atmosphere
2. temperatureThe reaction mixture was cooled
3. filtrationfiltered
4. concentrationthe filtrate was concentrated
5. customThe dark residue was chromatographed (eluant: methylene chloride/methanol; 98/2) over silical gel