Sodium Thiosulfate → 5-[2-(methylsulfonyl)phenyl]-1H-pyrrole-3-carbaldehyde

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Reaction Steps

To a solution of 5-[2-(methylthio)phenyl]-1H-pyrrole-3-carbaldehyde (100 mg) in ethyl acetate (5 mL) was added 3-chloroperbenzoic acid (318 mg) under ice-cooling. After stirring at room temperature for 3 hr, a saturated sodium thiosulfate aqueous solution was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, dried over anhydrous sodium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (eluent:hexane-ethyl acetate=1:1→1:3) to give the title compound as pale-yellow crystals (yield 88.9 mg, 78%).

Provenance & Evidence