Hydrochloric Acid → 4-(3-Chloro-4-{[(cyclopropylamino)carbonyl]amino)phenoxy)-7-(2-methoxyethoxy)-6-quinolinecarboxylic acid

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Reaction Steps

Methyl 4-(3-chloro-4-{[(cyclopropylamino)carbonyl]amino}phenoxy)-7-(2-methoxyethoxy)-6-quinolinecarboxylate (2.26 g), 2N aqueous sodium hydroxide (20 ml), methanol (20 ml) and tetrahydrofuran (20 ml) were stirred together at room temperature for 1 hour. After adding 5N aqueous hydrochloric acid and distilling off 10 ml of the organic solvent, the precipitated solid was filtered out. The solid was washed with a methanol and water mixed solvent to obtain 2.0 g of the target substance as a faint red powder.

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