反应详情

To a cooled (0° C.) solution of 4-(4-chloro-phenyl)-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester (7.10 g, approx. 24.1 mmol) in methylene chloride (150 mL) was added a solution of 3-chloroperbenzoic acid (75%, 8.34 g, 36.2 mmol) in methylene chloride (120 mL) over 40 min. The mixture was warmed to rt and allowed to stir over night (16 h). The solution was washed twice with a half-saturated aqueous solution of sodium bisfulfite to destroy excess oxidant. The mixture was then twice washed with half-saturated aqueous potassium carbonate, and brine. The extracts were dried over magnesium sulfate, filtered and concentrated to afford a crude oil which was purified by silica gel chromatography (100% hexanes-80% hexanes/20% ethyl acetate gradient) to afford pure 6-(4-Chloro-phenyl)-7-oxa-3-aza-bicyclo[4.1.0]heptane-3-carboxylic acid tert-butyl ester (5.34 g, 71%) as a clear, colorless oil which solidified on standing.

1. washThe solution was washed twice with a half-saturated aqueous solution of sodium bisfulfite
2. customto destroy excess oxidant
3. washThe mixture was then twice washed with half-saturated aqueous potassium carbonate, and brine
4. dry with materialThe extracts were dried over magnesium sulfate
5. filtrationfiltered
6. concentrationconcentrated
7. customto afford a crude oil which
8. customwas purified by silica gel chromatography (100% hexanes-80% hexanes/20% ethyl acetate gradient)