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

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Reaction Conditions

Reaction Steps

A mixture of 1-benzyl-8-bromo-5-hydroxy-2-oxo-3-phenyl-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl ester (70 mg, 0.15 mmol), 2-methyl-5-tributylstannanyl-pyridine (86 mg, 0.23 mmol) and PdCl2(PPh3)2 (21 mg, 0.030 mmol) in 4 mL of DMF was heated at 120° C. for 3 h under nitrogen atmosphere. After the mixture was cooled to r.t., EtOAc and brine 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 combined organic layer was washed with water and dried over MgSO4. After evaporating the solvent in vacuo, the crude product was chromatographed (10-90% EtOAc/hexanes+1% AcOH) to give 40 mg of the title compound as a white solid. MS: (+) m/z 478.45 (M+1).

Provenance & Evidence