反应详情

温度

60 °C

A solution of 25 g of 4-methyl-3-phenoxypyridine, [J.Med.Chem., 18, 1 (1975)] in 90 ml of glacial acetic acid is treated with 30 ml of 40% peracetic acid in acetic acid and the mixture is stirred and heated at 60° C. for 12 hours. Two further 10 ml portions of 40% peracetic acid are added and the mixture heated 4 hours at 60° C. 100 ml of isopropanol is added and the mixture is heated at 90° C. for 4 hours. The mixture is stripped at reduced pressure and dissolved in 500 ml of dichloromethane. The organic layer is washed with an excess of 25% sodium hydroxide solution, dried over anhydrous magnesium sulfate, filtered, concentrated, and distilled to yield 4-methyl-3-phenoxypyridine-1-oxide. B.P. 150°-152° C./0.3 mm

1. temperaturethe mixture heated 4 hours at 60° C
2. temperaturethe mixture is heated at 90° C. for 4 hours
3. washThe organic layer is washed with an excess of 25% sodium hydroxide solution
4. dry with materialdried over anhydrous magnesium sulfate
5. filtrationfiltered
6. concentrationconcentrated
7. distillationdistilled