Hydrogen Peroxide → (1R,2S)-2-(3-pyridyl)tetrahydro-2H-thiopyran 1-oxide

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Reaction Steps

A solution of (S)-2-(3-pyridyl)tetrahydro-2H-thiopyran (1.5 g) in dichloromethane (15 ml) is treated with ethanol (15 ml), followed by copper acetylacetonate (0.22 g). The green-blue solution is treated with a solution of hydrogen peroxide (2 ml; 27.5%) in ethanol (2 ml). After 2 hours the solution is treated with a further quantity of solution of hydrogen peroxide (1 ml; 27.5%) in ethanol (1 ml), followed by a similar further quantity each hour for seven hours. Thus, a total of 10 ml of 27.5% hydrogen peroxide is used. After a further period of four hours, the mixture is treated with dichloromethane (10 ml) and extracted with water (4×25 ml). The combined aqueous extract is treated with sodium ethylenediaminetetraacetate (0.5 g), followed by sufficient solid sodium chloride to form a saturated solution. This is then extracted with dichloromethane (4×50 ml), and the combined organic extract is dried over magnesium sulphate and evaporated, to give (1R,2S)-2-(3-pyridyl)tetrahydro-2H-thiopyran 1-oxide (1.1 g), in the form of a yellow solid.

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