Trifluoroacetic acid → 1-Benzyl-5-hydroxy-2-oxo-3-phenyl-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid [2-(2,2,2-trifluoro-acetylamino)-ethyl]amide

Participants

Reaction Steps

{2-[(1-Benzyl-5-hydroxy-2-oxo-3-phenyl-1,2-dihydro-[1,7]naphthyridine-6-carbonyl)-amino]ethyl}-carbamic acid tert-butyl ester (25 mg, 0.049 mmol) was dissolved in CH2Cl2 (2 mL). Trifluoroacetic acid (1 mL) was added, and the mixture was stirred for 2 h. Solvent and excess TFA was removed by evaporation, and to the residue were added THF (3 mL), triethylamine (0.034 mL, 0.24 mmol), and ethyl trifluoroacetate (2 mL). The resulting mixture was refluxed overnight, then concentrated to dryness. The residue was dissolved in EtOAc and washed with 0.1 M HCl. The organic layer was dried over MgSO4 and concentrated, and the crude product was purified by silica gel chromatography (0-5% MeOH/CH2Cl2) to give 12.7 mg of the title compound as a light yellow solid. MS: (+) m/z 511.33 (M+1).

Provenance & Evidence