Sodium Hydroxide → 5-Amino-1-methyl-6,7-difluoro-1,4-dihydro-8-methoxy-4-oxoquinoline-3-carboxylic acid

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Reaction Steps

A solution of ethyl 5-amino-1-methyl-6,7-difluoro-1,4-dihydro-8-methoxy-4-oxoquinoline-3-carboxylate (203 mg, 0.650 mmol) and 1M aq. NaOH (2 mL) in EtOH (5 mL) was stirred at 50° C. for 1 h. The solvent was removed and the residue was dissolved in water. The solution was acidified to pH 7 with 2M HCl and the resulting precipitate was removed by filtration, washed with water, and dried to yield 5-amino-1-methyl-6,7-difluoro-1,4-dihydro-8-methoxy-4-oxoquinoline-3-carboxylic acid (180 mg, 97%) as a pale yellow solid.

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