Dimethyl Sulfoxide → tert-Butyl (2S)-4-oxo-2-phenylpyrrolidine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

To a flame dried flask equipped with stir bar was added 150 mL anhydrous dichloromethane which was cooled to −78° C. Oxalyl chloride (3.8 mL, 44 mmol) and DMSO (4.8 mL, 61 mmol) were added sequentially and the reaction stirred for 10 min. tert-butyl(2S,4S)-4-hydroxy-2-phenylpyrrolidine-1-carboxylate (5-2, 2.28 g, 8.73 mmol) in 10 mL anhydrous dichloromethane was added dropwise and stirred 1 hour at −78° C. Triethylamine (12 mL, 87 mmol) was added and the reaction was warmed to 0° C. over 1 hour. Upon completion, the reaction was washed with 5% NaHCO3, brine and dried over MgSO4. The organic layer was concentrated to provide crude tert-butyl(2S)-4-oxo-2-phenylpyrrolidine-1-carboxylate (5-3).

Provenance & Evidence