Benzyl chloroformate → (S)-benzyl 2-((tert-butyldimethylsilyloxy)methyl)-5-oxopyrrolidine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

To a solution of (S)-5-((tert-butyldimethylsilyloxy)methyl)pyrrolidin-2-one (48.5 g, 0.21 mol) in THF (100 mL) was added t-BuOK (30.8 g, 0.27 mol) at 0° C. The mixture was stirred at 0° C. for 30 min followed by addition of Cbz-Cl (40.4 mL, 0.27 mol) dropwise at 0° C. The resulting mixture was stirred at RT overnight, quenched with saturated NH4Cl, concentrated to a small amount, and diluted with EtOAc. The organic layer was washed with water and brine, dried over Na2SO4, filtered, and concentrated under reduced pressure. The residue was purified on silica gel column using a mixture of EtOAc and hexanes to give (S)-benzyl 2-((tert-butyldimethylsilyloxy)methyl)-5-oxopyrrolidine-1-carboxylate (70 g, 91%). LRMS (M+H−44) m/z 320.2.

Provenance & Evidence