Potassium bisulfate → tert-butyl N-[(2S)-1-oxo-3-phenylpropan-2-yl]carbamate

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A mechanically stirred suspension of lithium aluminum hydride (6.59 g, 0.165 mol) in ether (1 L) was cooled to -45° C. under nitrogen. A solution of the product from Step A (0.150 mol) in ether (150 mL) was added, maintaining the temperature below -35° C. When the addition was complete, the reaction was warmed to 5° C., then recooled to -45° C. A solution of potassium hydrogen sulfate (36.1 g, 0.265 mol) in water was slowly added, maintaining the temperature below -5° C. After quenching, the reaction was stirred at room temperature for 1 h. The mixture was filtered through Celite, the ether evaporated, and the remainder partitioned between ethyl acetate and 2% potassium hydrogen sulfate. After washing with saturated brine, drying over magnesium sulfate and solvent removal, the title compound was obtained.

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