m-Chloroperbenzoic acid → 2-[6-(Methylsulfinyl)-2-pyrazinyl]-4H-1,3-benzothiazine-4-one

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Reaction Steps

2-[6-(Methylthio)-2-pyrazinyl]-4H-1,3-benzothiazine-4-one (0.14 g, 0.50 mmol) was dissolved in chloroform (50 ml), and a solution of 3-chloroperbenzoic acid (ca. 77%, 0.11 g, 0.50 mmol) was added dropwise thereto. The mixture was stirred at room temperature for 1 hr. The solvent was evaporated, and the residue was recrystallized from ethanol to give the titled compound (0.12 g, 79%) as pale yellow crystals.

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