[C:1](=O)([O-])[O-].[K+].[K+].CI.[Cl:9][C:10]1[CH:19]=[C:18]([C:20]([OH:22])=[O:21])[C:17]2[C:12](=[CH:13][CH:14]=[CH:15][CH:16]=2)[N:11]=1.[Cl-].[Na+]>CN(C=O)C>[CH3:1][O:21][C:20]([C:18]1[C:17]2[C:12](=[CH:13][CH:14]=[CH:15][CH:16]=2)[N:11]=[C:10]([Cl:9])[CH:19]=1)=[O:22]Potassium carbonate (5.55 g, 40.2 mmol) and methyl iodide (1.88 mL, 30.2 mmol) were added to a DMF (25 mL) solution of commercially available 2-chloro-4-quinolinecarboxylic acid (4.17 g, 20.1 mmol), and the mixture was stirred overnight at room temperature in an argon atmosphere. The reaction solution was added to a saturated aqueous solution of sodium chloride, and the deposited crystal was collected by filtration, washed with water, and dried to obtain the title compound (3.53 g, 15.9 mmol) as a pale yellow solid.
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