Water → (S)-2-(4-fluorophenyl)-3-(2-methylpyrrolidin-1-yl)-6-(2H-tetrazol-5-yl)quinoxaline

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To a solution of (S)-2-(4-fluorophenyl)-3-(2-methylpyrrolidin-1-yl)quinoxaline-6-carbonitrile (100 mg, 0.30 mmol) in DMSO (10 mL) was added dibromozinc (33.8 mg, 0.15 mmol), water (10 mL), azidosodium (48.8 mg, 0.75 mmol) and water (5 mL). The resulting solution was stirred for 1 days at 125° C. and then quenched by the addition of water (100 mL), extracted with dichloromethane (3×30 mL). The organic layers were combined and dried over anhydrous sodium sulfate and concentrated in vacuo to give a residue, which was purified via silica gel column chromatography (2% dichloromethane in methanol) to afford (S)-2-(4-fluorophenyl)-3-(2-methylpyrrolidin-1-yl)-6-(2H-tetrazol-5-yl)quinoxaline as a yellow solid (70.9 mg, 63%).

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