[F:1][C:2]1[N:3]=[CH:4][C:5]2[C:10]([CH:11]=1)=[CH:9][C:8]([C:12]([O:14]C)=[O:13])=[CH:7][CH:6]=2.[Li+].[OH-].Cl>C1COCC1.O>[F:1][C:2]1[N:3]=[CH:4][C:5]2[C:10]([CH:11]=1)=[CH:9][C:8]([C:12]([OH:14])=[O:13])=[CH:7][CH:6]=2A slurry of 88 (413 mg, 2.013 mmol) and LiOH (56 mg, 2.34 mmol) in THF (9.8 mL) and water (1.5 mL) was stirred at RT for 1.5 h. An additional 50 mg of LiOH was added (total: 106 mg, 4.43 mmol), and the reaction was stirred for an additional 2 h. The THF was removed on a rotary evaporator. The reaction mixture was suspended in water (10 mL) and treated with 10M HCl in water (0.604 mL, 6.04 mmol). A white cloudy precipitate was collected by vacuum filtration. The precipitate was washed with water (2×2 mL) and dried under house vacuum over night to afford 349 mg (100%) of 3-fluoroisoquinoline-6-carboxylic acid (90) as a white solid, which was used in the next step without further purification.
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