反应详情

Hydroxy-acetic acid methyl ester (0.96 g, 10.7 mmol) was dissolved in 2 ml of anhydrous tetrahydrofuran under nitrogen atmosphere, and sodium hydride (0.42 g, 10.7 mmol) was added thereto at room temperature. After stirring for 30 minutes, 2-chloro-5-fluoro-3-nitro-pyridine (1.57 g, 8.89 mmol) dissolved in 15 ml of anhydrous tetrahydrofuran was added dropwise at room temperature, and the reaction mixture was stirred at room temperature for 18 hours. After completion of the reaction by adding water, the mixture was extracted with dichloromethane, and the combined organic layer was washed with water and saturated saline solution, dried over anhydrous sodium sulfate (Na2SO4), filtered and evaporated under reduced pressure. The residue was purified by column chromatography on silica eluting with a solvent of n-hexane:ethyl acetate=9:1. The fractions containing the product were collected and evaporated to obtain (5-fluoro-3-nitro-pyridin-2-yloxy)-acetic acid methyl ester as yellow liquid (1.35 g, 66%).

1. customat room temperature
2. additionwas added dropwise at room temperature
3. stirringthe reaction mixture was stirred at room temperature for 18 hours
4. customAfter completion of the reaction
5. extractionthe mixture was extracted with dichloromethane
6. washthe combined organic layer was washed with water and saturated saline solution
7. dry with materialdried over anhydrous sodium sulfate (Na2SO4)
8. filtrationfiltered
9. customevaporated under reduced pressure
10. customThe residue was purified by column chromatography on silica eluting with a solvent of n-hexane
11. additionThe fractions containing the product
12. customwere collected
13. customevaporated