Hydrogen Peroxide → 4-Chloro-5-(methylsulfonyl)-1-(triisopropylsilyl)-1H-pyrrolo[2,3-b]pyridine

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Reaction Conditions

Reaction Steps

s-Butyllithium-hexane/cyclohexane solution (1.06 M, 0.700 mL, 0.742 mmol) was gradually added dropwise to 4-chloro-1-(triisopropylsilyl)-1H-pyrrolo[2,3-b]pyridine (100 mg, 0.324 mmol) obtained in Reference Synthetic Exampleb 6 in tetrahydrofuran (1 mL) cooled to −78° C., and the reaction mixture was stirred at −78° C. for 30 minutes and stirred with dimethyl disulfide (30 μL, 0.33 mmol) at −78° C. for 30 minutes. After addition of 1 M aqueous sodium hydroxide, the reaction mixture was extracted with ethyl acetate, and the organic layer was dried over anhydrous sodium sulfate and concentrated under reduced pressure. The resulting residue was dissolved in ethanol (2 mL) and stirred with ammonium molybdate tetrahydrate (40 mg, 0.032 mmol) and aqueous hydrogen peroxide (30 wt %, 132 μL, 1.29 mmol) at room temperature for 5 hours. After addition of water, the reaction mixture was extracted with ethyl acetate, and the organic layer was dried over anhydrous sodium sulfate and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (hexane/ethyl acetate=20/1→5/1 (v/v)) to give the title compound as a pale yellow oil (61.4 mg, yield 49%).

Provenance & Evidence