N-bromobutanimide → 8-Bromo-1-cyclohexylmethyl-5-hydroxy-2-oxo-3-phenyl-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl ester

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A mixture of 1-cyclohexylmethyl-5-hydroxy-2-oxo-3-phenyl-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl ester (81 mg, 0.21 mmol) and N-bromosuccinimide (40 mg, 0.23 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 (5-15% EtOAc/hexanes+1% AcOH) to give 62 mg of the title compound as a light yellow solid. MS: (−) m/z 469.20, 471.15 (M−1, 7″81Br).

Provenance & Evidence