Hydrochloric Acid → Ethyl 8-methyl-2,3-dihydrobenz-1,4-oxathiin-7-carboxylate

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Reaction Steps

1.0 g (3.4 mmol) of ethyl 3-(2-methylsulfonylthioethoxy)-2-methylbenzoate are dissolved in 5 ml of nitromethane. 0.42 g (3.14 mmol) of aluminum trichloride is added. The mixture is stirred at room temperature for 45 min. Working-up is carried out by addition of 10 ml of 2N hydrochloric acid and subsequent extraction with MTB ether. The combined organic phases are washed with water and sodium carbonate solution, dried over sodium sulfate and the solvent is distilled off.

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