反应详情

To a suspension of sodium hydride (0.47 g, 60% in oil) in 50 mL of THF was added dropwise a solution of 1 mL of 2,4-difluorophenol in 10 mL of THF. The reaction mixture was stirred for one hour, and 2-chloro-5-methyl-4-nitropyridine-1-oxide (2.0 g) was added slowly. The resulting mixture was stirred at reflux for 8 hours and at room temperature overnight. The solvent was removed and the light yellow solid isolated by extraction with methylene chloride. Purification via chromatography (silica gel, ethyl acetate/hexane, 1:1) gave 1.65 g of 2-(2,4-difluorophenoxy)-5-methyl-4-nitropyridine-1-oxide (55% yield). Mass Spec. M+H=283.

1. stirringThe resulting mixture was stirred
2. customThe solvent was removed
3. customthe light yellow solid isolated by extraction with methylene chloride
4. customPurification via chromatography (silica gel, ethyl acetate/hexane, 1:1)