Ethyl Acetate → tert-butyl (2S,4R)-4-((tert-butyldimethylsilyl)oxy)-2-(hydroxymethyl)pyrrolidine-1-carboxylate

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A solution of (2S,4R)-1-tert-butyl 2-methyl 4-(tert-butyldimethylsilyloxy)pyrrolidine-1,2-dicarboxylate (5.34 g, 14.8 mmol) in THF (20 mL) was cooled to 0° C. and lithium borohydride (0.485 g, 22.2 mmol) in THF (10 mL) was added dropwise. The mixture was stirred for about 16 hours while the ice-salt bath gradually melted. Ethyl acetate (30 mL) was added followed by the addition of ice. The organic portion was separated and quenched by a dropwise addition of 1N aqueous phosphoric acid. The organic portion was separated and washed with water (120 mL), saturated sodium bicarbonate solution (2×120 mL), and brine (100 mL) and dried over magnesium sulfate. The filtrate was concentrated under reduced pressure to yield (2S,4R)-tert-butyl 4-(tert-butyldimethylsilyloxy)-2-(hydroxymethyl)pyrrolidine-1-carboxylate (4.8 g, 14.4 mmol) as a colorless oil. RP-HPLC (Table 1, Method f) Rt 6.25 min; m/z: (M−H)− 390.

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