[CH:1]1([N:4]2[C:13]3[C:8](=[CH:9][C:10]([F:17])=[C:11](F)[C:12]=3[O:14][CH3:15])[C:7](=[O:18])[C:6]([C:19]([OH:21])=[O:20])=[CH:5]2)[CH2:3][CH2:2]1.C([NH:29][CH2:30][CH2:31][NH2:32])(OC(C)(C)C)=O.FC(F)(F)C(O)=O>CN(C)C(=O)C.CO>[NH2:29][CH2:30][CH2:31][NH:32][C:11]1[C:12]([O:14][CH3:15])=[C:13]2[C:8]([C:7](=[O:18])[C:6]([C:19]([OH:21])=[O:20])=[CH:5][N:4]2[CH:1]2[CH2:3][CH2:2]2)=[CH:9][C:10]=1[F:17]To a solution of 1-cyclopropyl-1,4-dihydro-4-oxo-6,7-difluoro-8-methoxy-3-quinoline carboxylic acid (1.0 g) in N,N-dimethylacetamide (10 ml), N-BOC-ethylenediamine (0.82 mg) was added. The mixture was heated at 120° C. for 12 h. Trifluoracetic acid (20 ml) was added and the reaction mixture was stirred at r.t. for 24 h. The solvent was evaporated under reduced pressure. The crude product was dissolved in water (5 ml) and pH adjusted with 20% NaOH to 7. The precipitate obtained was dispersed in MeOH and filtered to give the title compound (1.01 g).
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