Sodium Hydroxide → 6-[(2,3-Dichlorophenyl)methyl]-1-(2-hydroxyethyl)-4-oxo-quinoline-3-carboxylic acid

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Reaction Steps

Ethyl 1-(2-acetoxyethyl)-6-(2,3-dichlorobenzyl)-1,4-dihydro-4-oxo-3-quinolinecarboxylate obtained in Step 4 (6.0 g, 13.0 mmol) was suspended in ethanol (480 ml) and 4N aqueous sodium hydroxide solution (84 ml, 21 mmol) was added. The mixture was heated under reflux for 30 min. After allowing the mixture to cool, the reaction solution was partly concentrated under reduced pressure. Hydrochloric acid was added and the precipitate was collected by filtration, washed with water and ethanol and vacuum-dried to give an object product (4.5 g, yield 85%) as a white solid.

Provenance & Evidence