[NH2:1][C:2]1[CH:3]=[C:4]([CH:14]=[CH:15][CH:16]=1)[C:5]([CH:7]1[CH2:12][CH2:11][N:10]([CH3:13])[CH2:9][CH2:8]1)=[O:6].[C:17]1([N:23]=[C:24]=[O:25])[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1>C(Cl)Cl.C(O)(=O)C.CO>[C:17]1([NH:23][C:24](=[O:25])[NH:1][C:2]2[CH:3]=[C:4]([CH:14]=[CH:15][CH:16]=2)[C:5]([CH:7]2[CH2:8][CH2:9][N:10]([CH3:13])[CH2:11][CH2:12]2)=[O:6])[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=14-[3-aminobenzoyl]-1-methylpiperidine (25 mg, 0.115 mmol) and phenyl isocyanate (37 μL, 0.344 mmol) in methylene chloride (2 mL) were mixed for 72 h at ambient temperature. The solution was diluted with 10% acetic acid in methanol and poured over a Varian Mega Bond Elut™ strong cation exchange column. The column was rinsed extensively with methanol to remove impurities, then treated with a 2M ammonia in methanol to elute the product from the column. The solvent was evaporated and the residue was stirred with 5N sodium hydroxide solution (1 mL). The solvent was removed under vacuum and the residue was purified by silica gel chromatography (methylene chloride:methanol:ammonium hydroxide, 97.5:2.5:0.25 then 95:5:0.5). The solvent was evaporated to give 28.5 mg (74%) of the title compound.
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