反应详情

A solution of 4-isopropylpyridine and 1.5 mL of 30% H2O2 in 7 mL of AcOH was heated at 135° C. A total of 15.4 mL of H2O2 was added in 4 portions, and the solution was refluxed for 2 h. Chloroform and water were added, the layers were separated, and the aqueous layer was extracted 3 times with CHCl3. The combined extracts were dried over Na2SO4, filtered, and concentrated. Purification by flash silica gel chromatography (5% MeOH/CHCl3) provided 139 mg of the 4-isopropylpyridine N-oxide as an orange oil.

1. temperaturethe solution was refluxed for 2 h
2. customthe layers were separated
3. extractionthe aqueous layer was extracted 3 times with CHCl3
4. dry with materialThe combined extracts were dried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated
7. customPurification by flash silica gel chromatography (5% MeOH/CHCl3)