Ethyl Acetate → trans-Tert-butyl 3-(((benzyloxy)carbonyl)amino)-4-hydroxypyrrolidine-1-carboxylate

Participants

Reaction Steps

To a solution of (3R,4R)-tert-butyl 3-amino-4-hydroxypyrrolidine-1-carboxylate (4.40 g, 21.76 mmol) and Na2CO3 (2.77 g, 26.11 mmol) in dioxane (50 mL) and water (50 mL) was added Cbz-Cl (3.87 mL, 26.11 mmol) at 0° C. The reaction mixture was warmed to ambient temperature and stirred at ambient temperature for 3 hours. Ethyl acetate (50 mL) was added. The organic layer was separated, washed with brine, dried (sodium sulfate), filtered and concentrated under reduced pressure. The residue was purified by flash chromatography on silica gel (5:1 hexane/ethyl acetate) to give (3R,4R)-tert-butyl 3-(benzyloxycarbonylamino)-4-hydroxypyrrolidine-1-carboxylate (4.91 g, 67.1%) as an oil.

Provenance & Evidence