反应详情

3-Amino-naphthalene-2-carboxylic acid (compound A′) (1.2 g) was dissolved in anhydrous methylene chloride (12 ml). 1-(3-Dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (2.5 g), 1-hydroxybenzotriazole monohydrate (1.5 g), and triethylamine (1 ml) were added to the solution at room temperature, and the mixture was then stirred at that temperature for 12 hr. After the completion of the reaction, distilled water was added thereto at room temperature, and the mixture was subjected to separatory extraction with chloroform. The organic layer was washed with saturated brine, was dried over sodium sulfate, and was then concentrated under the reduced pressure. The residue was purified by column chromatography using a hexane-acetone system to give 3-amino-naphthalene-2-carboxylic acid methyl ester as a useful intermediate (compound A) (530 mg, yield 41%).

1. customAfter the completion of the reaction
2. distillationdistilled water
3. additionwas added
4. extractionat room temperature, and the mixture was subjected to separatory extraction with chloroform
5. washThe organic layer was washed with saturated brine
6. dry with materialwas dried over sodium sulfate
7. concentrationwas then concentrated under the reduced pressure
8. customThe residue was purified by column chromatography