[CH3:1][N:2]([CH3:24])[S:3]([CH2:6][CH2:7][N:8]1[C:17]2[C:12](=[N:13][CH:14]=[CH:15][CH:16]=2)[C:11]([OH:18])=[C:10]([C:19]([O:21]C)=O)[C:9]1=[O:23])(=[O:5])=[O:4].[F:25][C:26]1[CH:33]=[CH:32][C:29]([CH2:30][NH2:31])=[CH:28][CH:27]=1>CCO>[CH3:24][N:2]([CH3:1])[S:3]([CH2:6][CH2:7][N:8]1[C:17]2[C:12](=[N:13][CH:14]=[CH:15][CH:16]=2)[C:11]([OH:18])=[C:10]([C:19]([NH:31][CH2:30][C:29]2[CH:32]=[CH:33][C:26]([F:25])=[CH:27][CH:28]=2)=[O:21])[C:9]1=[O:23])(=[O:5])=[O:4]Methyl 1-{2-[(dimethylamino)sulfonyl]ethyl}-4-hydroxy-2-oxo-1,2-dihydro-1,5-naphthyridine-3-carboxylate (0.3 g, 0.84 mmol) was suspended in 8 mL of absolute EtOH and treated with 4-fluorobenzyl amine (0.29 mL, 2.53 mmol). The mixture was brought to reflux for 2.5 hours, cooled, and the solids collected and washed with a little cold EtOH to give the product as a white solid.
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