Triethylamine → HCID 13968592, compound

Participants

Reaction Conditions

Reaction Steps

N-tert-butyloxycarbonyl glycine 1a (5 g, 28.56 mmol) and L-prolinamide (3.25 g, 28.50 mmol) were dissolved in 75 mL of N,N-dimethylformamide and the mixture was cooled to 0° C. Then 1-hydroxybenzotriazole (11.8 g, 87.3 mmol), N-ethyl-N′-(dimethylaminopropyl)-carbodiimide (11.3 g, 59 mmol) and triethylamine (12.1 mL, 87.3 mmol) were added with stirring. The reaction mixture was warmed up to room temperature and stirred overnight. The reaction was monitored by thin layer chromatography (TLC) until the disappearance of the starting materials. N,N-dimethylformamide was evaporated below 50° C. The resulting mixture was extracted with ethyl acetate (200 mL×3). The combined organic extracts were washed with 50 mL of saturated brine, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The residue was recrystallized from ethyl acetate to obtain the title compound (S)-[2-(2-carbamoyl-pyrrolidin-1-yl)-2-oxo-ethyl]-carbamic acid tert-butyl ester 1b (7.42 g, yield 95.8%) as a white powder.

Provenance & Evidence