反应详情

A mixture of 1-benzyl-5-hydroxy-2-oxo-3-phenyl-8-pyridin-3-yl-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl ester (80 mg, 0.17 mmol), 2 M NaOH (3 mL), MeOH (3 mL) and THF (3 mL) was stirred at r.t. for 16 h, then concentrated to approximately one-third of its original volume. 1 M HCl was added until pH was about 3-4, and the resulting suspension was extracted with EtOAc. The organic layer was dried over MgSO4 and concentrated to give 68 mg of 1-benzyl-5-hydroxy-2-oxo-3-phenyl-8-pyridin-3-yl-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid as a yellow solid, which was immediately used in the next step without purification.

1. concentrationconcentrated to approximately one-third of its original volume
2. addition1 M HCl was added until pH was about 3-4
3. extractionthe resulting suspension was extracted with EtOAc
4. dry with materialThe organic layer was dried over MgSO4
5. concentrationconcentrated