m-Chloroperbenzoic acid → 2-(6-Isoamylsulfinyl-2-pyridyl)-4H-1,3-benzothiazine-4-one

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Reaction Steps

2-[6-(Isoamylthio)-2-pyridyl]-4H-1,3-benzothiazine-4-one (0.15 g, 0.44 mmol) was dissolved in chloroform (50 ml), and a solution of 3-chloroperbenzoic acid (ca. 77%, 0.10 g, 0.46 mmol) in chloroform (10 ml) was added dropwise thereto. The reaction mixture was stirred at room temperature for 1 hr. The solvent was evaporated, and the residue was recrystallized from hexane-ethyl acetate to give the titled compound (0.15 g, 96%) as pale yellow amorphous.

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