Sodium hydride → 1414837-14-1

Participants

Reaction Conditions

Reaction Steps

Racemic tert-butyl (3R,4S) and (3S,4R)-4-phenylpyrrolidin-3-ylcarbamate (260 mg, 0.991 mmol) was taken up in DMF (5 ml) and cooled to 0° C. NaH (59.5 mg, 1.487 mmol) was added slowly. The reaction was allowed to stir for 10 minutes at 0° C. before adding 2,2,2-trifluoroethyl trifluoromethanesulfonate (345 mg, 1.487 mmol). The reaction continued to stir at 0° C. for 1 hour and was then allowed to reach room temperature and continue stirring for 16 hours. LC/MS in showed full conversion to desired product. Saturated NH4Cl was added slowly. EtOAc and water were added. Our products were extracted into EtOAc (3×). The combined organic layers were then washed with brine, dried over MgSO4, and concentrated in vacuo. Purification by MPLC SNAP 25 g 0-25% EtOAc/hexanes gave racemic tert-butyl (3R,4S) and (3S,4R)-4-phenyl-1-(2,2,2-trifluoroethyl)pyrrolidin-3-yl)carbamate (258 mg, 0.749 mmol, 76% yield). MS ESI calc'd. For C17H24F3N2O2 [M+1]+ 345, found 345.

Provenance & Evidence