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

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Reaction Steps

A mixture of 1-benzyl-5-hydroxy-3-methyl-2-oxo-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl ester (0.62 g, 1.9 mmol) and N-bromosuccinimide (0.36 g, 2.01 mmol) was refluxed for 3 h. After the mixture was cooled to r.t., solvent was evaporated in vacuo. The residue was chromatographed (0-30% EtOAc/hexanes+2% AcOH) to give 493 mg of the title compound as a pale yellow solid. MS: (+) m/z 402.98, 404.86 (M+1, 79/81Br)

Provenance & Evidence