5-Aminovaleric acid → 5-{[1-(5-Fluoro-pyridin-3-yl)-4-hydroxy-7-phenoxy-isoquinoline-3-carbonyl]-amino}-pentanoic acid

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Reaction Steps

A mixture of 1-(5-fluoro-pyridin-3-yl)-4-hydroxy-7-phenoxy-isoquinoline-3-carboxylic acid methyl ester (50 mg, 0.13 mmol), 5-aminovaleric acid (751 mg, 6.41 mmol) and NaOMe (10 mL, 5.13 mmol, 0.5 M in MeOH) was refluxed for 16 h. After cooling the mixture to r.t., the solvent was evaporated. The residue was partitioned between water and EtOAc. 1 M HCl was added with vigorous stirring until pH was ˜2. The organic layer was dried over MgSO4 and concentrated. The crude product was purified by column chromatography (5-50% EtOAc/hexanes+2% AcOH) to give 33 mg of the title compound as an off-white solid. MS: (+) m/z 476.12 (M+1).

Provenance & Evidence