Triethylamine → (S)-4-benzyl-3-[(3R,4S)-1-benzyl-4-(3,4-difluoro-phenyl)-pyrrolidine-3-carbonyl]-oxazolidin-2-one

To a solution of (3RS,4SR)-1-benzyl-4-(3,4-difluoro-phenyl)-pyrrolidine-3-carboxylic acid (25 g, 78.8 mmol) in THF (350 mL) at -20° C. were added triethylamine (27.45 mL, 197 mmol) and pivaloyl chloride (24.2 mL, 197 mmol) subsequently. Stirring was continued for two hours at the same temperature, and to this mixture were added (S)-4-Benzyl-oxazolidin-2-one (14.7 g, 82.7 mmol) and lithium chloride (3.67 g, 86.7 mmol). The reaction mixture was gradually warmed to room temperature and stirred overnight. The reaction mixture was diluted with ethyl acetate and washed with water two times and saturated sodiumbicarbonate. The separated organic phase was dried on Na2SO4 and concentrated under vacuo. The two diastereoisomeres were separated by column chromatography (SiO2, EtOAc/H, 15:85) to yield (S)-4-benzyl-3-[(3R,4S)-1-benzyl-4-(3,4-difluoro-phenyl)-pyrrolidine-3-carbonyl]-oxazolidin-2-one 18 g (48%) as awhite solid. MS m/e: 477.1 (M+H+).

1. stirringstirred overnight
2. washwashed with water two times and saturated sodiumbicarbonate
3. customThe separated organic phase was dried on Na2SO4
4. concentrationconcentrated under vacuo
5. customThe two diastereoisomeres were separated by column chromatography (SiO2, EtOAc/H, 15:85)

ORDレコード

ord-f818292fbe1e41d8a156ba3a6ed4ed08

出典データセット

uspto-grants-2011_09

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US08012998B2