Hydrochloric Acid → 1-Benzyl-5-hydroxy-8-(1-methyl-1H-pyrazol-4-yl)-2-oxo-3-phenyl-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl ester

Participants

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 (100 mg, 0.22 mmol), 1-methyl-4-tributylstannanyl-1H-pyrazole (0.105 mL, 0.32 mmol) and PdCl2(PPh3)2 (30 mg, 0.043 mmol) in 5 mL of DMF was heated at 120° C. for 2 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 brine, and dried over MgSO4. After evaporating the solvent in vacuo, the crude product was chromatographed (5-100% EtOAc/hexanes+1% AcOH) to give 52 mg of the title compound. MS: (+) m/z 467.37 (M+1).

Provenance & Evidence