Hydrochloric Acid → 1-Benzyl-5-(5-fluoro-pyridin-3-yl)-8-hydroxy-2-oxo-1,2-dihydro-[1,6]naphthyridine-7-carboxylic acid methyl ester

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Reaction Conditions

Reaction Steps

A mixture of 1-benzyl-5-bromo-8-hydroxy-2-oxo-1,2-dihydro-[1,6]naphthyridine-7-carboxylic acid methyl ester (70 mg, 0.18 mmol), 5-fluoro-pyridine-3-boronic acid (30 mg, 0.22 mmol), Pd(PPh3)4 (21 mg, 0.018 mmol) and Cs2CO3 (117 mg, 0.36 mmol) in DMF (4 mL) was heated at 100° C. for 16 h under nitrogen atmosphere. After cooling to r.t., EtOAc (50 mL) and brine (10 mL) were added. 1 M HCl was added until pH about 4. The aqueous layer was extracted with additional EtOAc, and the organic layers were combined, washed with water, and dried over MgSO4. After evaporating the solvent, the crude product was purified by silica gel chromatography (0-70% EtOAc/hexanes+2% AcOH) to give 45 mg of the title compound. MS: (+) m/z 406.33 (M+1).

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