Sodium Hydroxide → {[1-(naphthalen-1-yl)-1H-tetrazol-5-yl]sulfanyl}acetic acid

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A mixture of ethyl 2-(1-(naphthalen-1-yl)-1H-tetrazol-5-ylthio)acetate (269 mg, 0.86 mmol), aqueous sodium hydroxide solution (10%, 5 mL) and methanol (10 mL) was stirred at reflux for 2 hours. The reaction was then cooled to room temperature and the methanol removed. Water was added, neutralized with aqueous HCl solution (1N) and extracted with ethyl acetate. The organic layer was dried over sodium sulfate and concentrated. Purification by preparative thin layer chromatography (95% dichloromethane/5% methanol) afforded compound 2-(1-(naphthalen-1-yl)-1H-tetrazol-5-ylthio)acetic acid as a solid.

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