C(S([C:6]1[N:15]=[C:14]2[C:9]([C:10](=[O:24])[C:11]([C:19]([O:21]CC)=[O:20])=[CH:12][N:13]2[CH2:16][CH2:17][F:18])=[CH:8][C:7]=1[F:25])(=O)=O)C.[CH3:26][N:27]([CH3:33])[CH:28]1[CH2:32][CH2:31][NH:30][CH2:29]1>>[CH3:26][N:27]([CH3:33])[CH:28]1[CH2:32][CH2:31][N:30]([C:6]2[N:15]=[C:14]3[C:9]([C:10](=[O:24])[C:11]([C:19]([OH:21])=[O:20])=[CH:12][N:13]3[CH2:16][CH2:17][F:18])=[CH:8][C:7]=2[F:25])[CH2:29]1The same reaction as in Example 4 was carried out using ethyl 7-ethylsulfonyl-6-fluoro-1-(2-fluoroethyl)-1,4-dihydro-4-oxo-1,8-naphthyridine-3-carboxylate and 3-dimethylaminopyrrolidine as starting materials. There was obtained the compound 5, m.p. 247°-249° C.
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