N-bromobutanimide → 1-Benzyl-8-bromo-5-hydroxy-2-oxo-3-(4-trifluoromethyl-phenyl)-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl ester

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Reaction Steps

A mixture of 1-benzyl-5-hydroxy-2-oxo-3-(4-trifluoromethyl-phenyl)-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl ester (99 mg, 0.22 mmol) and N-bromosuccinimide (43 mg, 0.24 mmol) in CH2Cl2 (0.8 mL) was refluxed for 3 h. Solvent was evaporated in vacuo, and the residue was purified by silica gel chromatography (5-20% EtOAc/hexanes+1% AcOH) to give 76 mg of the title compound as a yellow solid. MS: (−) m/z 531.23, 533.18 (M−1, 79/81Br).

Provenance & Evidence