Water → (S)-3-((R)-2-Ethylsulfanyl-1-hydroxyethyl)pyrrolidine-1-carboxylic Acid t-Butyl Ester

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Ethanethiol (312 μL, 4.2 mmol) was dissolved in THF (1.0 mL), and the mixture was cooled to 0° C. NaH (50.6 mg, 2.1 mmol) was slowly added in four portions and the mixture was stirred at room temperature for 10 minutes. (S)—(R)-3-Oxiranylpyrrolidine-1-carboxylic acid t-butyl ester (300 mg, 1.4 mmol) was dissolved in THF (0.4 mL) and added to the mixture. The resulting solution was placed in a microwave reactor for 30 minutes at 100° C., then cooled to room temperature. Hexanes (3×10 mL) was added, followed by water (10 mL). The organic layer was collected, dried over Na2SO4, filtered, and concentrated. The crude product was purified by column chromatography (0-100% EtOAc in hexanes) to yield the title compound as a clear oil (315 mg).

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