反应详情

7.3 g (102 mmol) of 2-methoxy-1-propene, 28 ml of sodium hypochlorite solution (12.5% strength) and a spatula-tip of sodium acetate were added successively to 10.0 g (34 mmol) of methyl 2-chloro-3-(hydroxyiminomethyl)-4-methylsulfonylbenzoate in 200 ml of methylene chloride. The mixture was stirred at room temperature for 12 hours, the solvent was removed and the residue was taken up in ethyl acetate, washed with water, dried and concentrated. The residue was chromatographed over silica gel (eluent: cyclohexane:ethyl acetate=3:2). This gave 5.8 g (47% of theory) of methyl 2-chloro-3-(5-methoxy-5-methyl-4,5-dihydroisoxazol-3-yl)-4-methylsulfonylbenzoate.

1. customthe solvent was removed
2. washwashed with water
3. customdried
4. concentrationconcentrated
5. customThe residue was chromatographed over silica gel (eluent: cyclohexane:ethyl acetate=3:2)