Sulfuric Acid → Methyl 2-(3,4-dichlorophenyl)-2-(3-oxobutylthio)acetate

Participants

Reaction Conditions

Reaction Steps

To a methanol (2 mL) solution of methyl 2-thioacetyl-2-(3,4-dichlorophenyl)acetate (0.50 g, 1.7 mmol), concentrated sulfuric acid (0.050 mL, 0.55 equivalent amount) was added, followed by stirring at 60° C. for 3 hours. After the reaction solution was cooled to room temperature, it was dropwise added to an ethyl acetate (2 mL) solution of methyl vinyl ketone (0.17 mL, 1.2 equivalent amounts) and triethylamine (0.36 mL, 1.5 equivalent amount) at room temperature. The reaction solution was mixed with ethyl acetate (1 mL), followed by liquid separation with a mixed liquid of water-saturated salt solution (1:1, (v/v)), and further, the organic layer was washed with a saturated ammonium chloride aqueous solution and a saturated salt solution and dried over anhydrous magnesium sulfate. The drying agent was removed by filtration, and the solvent was distilled off to give the desired product as a colorless oil (0.42 g, yield: 76%).

Provenance & Evidence