Hydrochloric Acid → 1-Benzyl-8-hydroxy-5-methyl-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-8-hydroxy-5-iodo-2-oxo-1,2-dihydro-[1,6]naphthyridine-7-carboxylic acid methyl ester (86 mg, 0.197 mmol), tetramethyltin (0.14 mL, 0.99 mmol) and PdCl2(PPh3)2 (28 mg, 0.039 mmol) in DMF (4 mL) was heated at 120° C. for 2 h under N2 atmosphere. After cooling to r.t., EtOAc (50 mL) and brine (10 mL) were added. 1 M HCl was added until pH about 2-3. The aqueous layer was extracted with additional EtOAc, and the organic layers were combined, dried over MgSO4, and concentrated. The crude product was purified by silica gel chromatography (0-3% MeOH/CH2Cl2) to give 18 mg of the title compound as a white solid. MS: (+) m/z 325.28 (M+1).

Provenance & Evidence