Hydrochloric Acid → 1-Benzyl-5-hydroxy-8-methyl-2-oxo-1,2,3,4-tetrahydro-[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-1,2,3,4-tetrahydro-[1,7]naphthyridine-6-carboxylic acid methyl ester (145 mg, 0.37 mmol), tetramethyltin (0.3 mL, 1.85 mmol), and PdCl2(PPh3)2 (52 mg, 0.074 mmol) in DMF (5 mL) was heated at 120° C. under nitrogen atmosphere for 2 h. After the mixture was cooled to r.t., EtOAc (50 mL) and brine (10 mL) were added. 1M HCl was added until pH about 3. The aqueous layer was extracted with additional EtOAc, and the organic layers were combined and washed with water and dried over MgSO4. After the solvent was evaporated in vacuo, the crude product was chromatographed (0-60% EtOAc/hexanes+2% AcOH) to give 96 mg of the title compound. MS: (+) m/z 327.11 (M+1).

Provenance & Evidence