[CH3:1][O-:2].[Na+].[Na].[NH2:5][CH2:6][CH:7]1[CH2:11][CH2:10][N:9]([C:12]2[C:21](F)=[C:20]3[C:15]([C:16](=[O:29])[C:17]([C:26]([OH:28])=[O:27])=[CH:18][N:19]3[CH:23]3[CH2:25][CH2:24]3)=[CH:14][C:13]=2[F:30])[CH2:8]1>CO>[NH2:5][CH2:6][CH:7]1[CH2:11][CH2:10][N:9]([C:12]2[C:21]([O:2][CH3:1])=[C:20]3[C:15]([C:16](=[O:29])[C:17]([C:26]([OH:28])=[O:27])=[CH:18][N:19]3[CH:23]3[CH2:25][CH2:24]3)=[CH:14][C:13]=2[F:30])[CH2:8]1To a solution of sodium methoxide prepare from sodium (0.2 g) and absolute methanol (9 ml) was added 7-(3-aminomethyl-1-pyrrolidinyl)-1-cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid (0.5 g) and the mixture in sealed tube was stirred for 86 hours at 140° to 150° C. and then concentrated. Small amount of water was added to the residue, and the solution was adjusted pH 7 with acetic acid and then concentrated. The resulting residue was purified by silica gel column chromatography eluting with chloroform-methanol-concentrated aqueous ammonia (20:6:1) and recrystallized from methanol to give the title compound (40 mg) as pale yellow prisms, mp 225°-228.5° C. (decompd.).
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