反应详情

A mixture of 1-benzyl-8-cyano-5-hydroxy-2-oxo-3-phenyl-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl ester (30 mg, 0.073 mmol), D-phenylalanine (241 mg, 1.46 mmol), and NaOMe (59 mg, 1.09 mmol) in 2-methoxyethanol (10 mL) was refluxed for 3 h. After the mixture was cooled to r.t., solvent was evaporated in vacuo. The residue was partitioned between EtOAc and water. 1 M HCl was added with vigorous stirring until pH was about 2. The organic layer was dried over MgSO4 and concentrated. The residue was chromatographed (5-40% EtOAc/hexanes+2% AcOH) to give 40 mg of the title compound. MS: (+) m/z 545.06 (M+1).

1. temperaturewas refluxed for 3 h
2. customsolvent was evaporated in vacuo
3. customThe residue was partitioned between EtOAc and water
4. addition1 M HCl was added
5. dry with materialThe organic layer was dried over MgSO4
6. concentrationconcentrated
7. customThe residue was chromatographed (5-40% EtOAc/hexanes+2% AcOH)