Propylene → Methyl 2-chloro-(5-methyl-4,5-dihydroisoxazol-3-yl)-4-methylsulfonylbenzoate

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Reaction Steps

At room temperature, propene was introduced into a solution of 15.0 g (52 mmol) of methyl 2-chloro-3-hydroxyiminomethyl-4-methylsulfonylbenzoate and 200 ml of dichloromethane for 30 minutes. After the addition of 1.6 g of sodium acetate, 42.8 ml of sodium hypochlorite solution were added dropwise, with the simultaneous introduction of propene. At room temperature, propene was subsequently introduced into the mixture for a further 15 minutes. The mixture was heated for 3 hours under reflux and then stirred for 12 hours at room temperature, propene was introduced once more under reflux for 5 hours and the mixture was stirred at room temperature for another 12 hours. The phases were separated and the organic phase was washed with water, dried and concentrated. 15.5 g (89% of theory) of methyl 2-chloro-(5-methyl-4,5-dihydroisoxazol-3-yl)-4-methylsulfonylbenzoate were obtained.

Provenance & Evidence