Diisopropylethylamine → (S)-tert-butyl 1-(1-(3-chloro-5-(trifluoromethyl)pyridin-2-yl)piperidin-4-yl)-2-oxopyrrolidin-3-ylcarbamate

Participants

Reaction Steps

To a solution of (S)-tert-butyl 2-oxo-1-(piperidin-4-yl)pyrrolidin-3-ylcarbamate (4.0 g, 14 mmol) in DMF (50 mL) was added N-ethyl-N-isopropylpropan-2-amine (5.5 g, 42 mmol) and 2,3-dichloro-5-(trifluoromethyl)pyridine (9.1 g, 42 mmol) and the reaction was stirred overnight at ambient temperature. The reaction was diluted with EtOAc (about 200 mL) and the organic layer was washed with water (100 mL), and brine (50 mL), dried over MgSO4, and concentrated under vacuum. The crude material was purified on silica using a gradient of DCM to 5% EtOAc/DCM as eluent to give (S)-tert-butyl 1-(1-(3-chloro-5-(trifluoromethyl)pyridin-2-yl)piperidin-4-yl)-2-oxopyrrolidin-3-ylcarbamate (4.0 g, 61%).

Provenance & Evidence