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

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Reaction Conditions

Reaction Steps

A mixture of 1-benzyl-3-bromo-5-hydroxy-2-oxo-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl ester (70 mg, 0.18 mmol), 3-(tributylstannyl)pyridine (0.086 mL, 0.27 mmol), and PdCl2(PPh3)2 (25 mg, 0.036 mmol) in DMF (5 mL) was heated at 120° C. under nitrogen atmosphere for 2 h. After the mixture was cooled to r.t., brine (10 mL) and EtOAc (50 mL) were added. 1 M HCl was added with stirring until pH was about 3-4. 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 in vacuo, the crude product was purified twice by silica gel chromatography (0-5% MeOH/CH2Cl2, then 20-100% EtOAc/hexanes+2% AcOH) to give 35 mg of the title compound as an off-white solid. MS: (+) m/z 388.26 (M+1).

Provenance & Evidence