Dichloromethane → 1-Benzenesulfonyl-5-(3,4-dimethoxy-phenyl)-3-iodo-1H-pyrrolo[2,3-b]pyridine

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Reaction Steps

Into a Round bottom flask was added 5-(3,4-Dimethoxy-phenyl)-3-iodo-1H-pyrrolo[2,3-b]pyridine, 133, (0.403 g, 0.00106 mol) and Tetra-N-butylammonium bromide (0.0342 g, 0.000106 mol), in 5.000 M of Sodium hydroxide in Water (2.73 mL). Benzenesulfonyl chloride (0.225 g, 0.00127 mol) in Methylene chloride (0.747 mL, 0.0116 mol) was added dropwise. After 2 h, 30 mL of Methylene chloride and 30 mL of water were added. The organic layer was separated and washed with 1M sodium bicarbonate (aq.) (30 ml×2) followed by water (30 ml) and brine (30 mL). The organic layer was collected and dried over anhydrous sodium sulfate, then concentrated under reduced pressure. The residue was purified by chromatography (Silica gel, ethyl acetate/hexanes) to give 295 mg of the desired product as a white solid. MS(ESI) [M+H+]+=521.04

Provenance & Evidence