[OH:1][C:2]1[C:11]2[C:6](=[CH:7][CH:8]=[C:9]([N+:12]([O-])=O)[CH:10]=2)[N:5]=[C:4]([C:15]([O:17][CH2:18][CH3:19])=[O:16])[C:3]=1[C:20]([O:22][CH2:23][CH3:24])=[O:21].C(O)(=O)C>C(O)C.[Fe]>[NH2:12][C:9]1[CH:10]=[C:11]2[C:6](=[CH:7][CH:8]=1)[N:5]=[C:4]([C:15]([O:17][CH2:18][CH3:19])=[O:16])[C:3]([C:20]([O:22][CH2:23][CH3:24])=[O:21])=[C:2]2[OH:1]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).
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