Hydrochloric Acid → 1-Benzyl-5-hydroxy-3-(1-methyl-1H-pyrazol-4-yl)-2-oxo-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 (80 mg, 0.21 mmol), 1-methyl-4-tributylstannanyl-1H-pyrazole (0.1 mL, 0.31 mmol), and PdCl2(PPh3)2 (29 mg, 0.041 mmol) in DMF (5 mL) was heated at 120° C. under nitrogen atmosphere for 2 h. After the mixture was cooled to r.t., water and EtOAc were added. 1 M HCl was added until pH was 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 (50% EtOAc/CH2Cl2, then 100% EtOAc+1% AcOH) to give 44 mg of the title compound. MS: (+) m/z 391.29 (M+1).

Provenance & Evidence