m-Chloroperbenzoic acid → Methyl ({[6-(4-oxo-4H-1,3-benzothiazin-2-yl)-2-pyridyl]methyl}sulfinyl)acetate

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Reaction Steps

Methyl ({[6-(4-oxo-4H-1,3-benzothiazin-2-yl)-2-pyridyl]methyl}thio)acetate (0.10 g, 0.28 mmol) was dissolved in chloroform (50 ml), and a solution of 3-chloroperbenzoic acid (ca. 77%, 0.064 g, 0.28 mmol) in chloroform (10 ml) 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 (0.096 g, 92%) as pale yellow crystals.

Provenance & Evidence