Preparation of (+)-chlorofluoroiodomethane, determination of its enantiomeric excess and of its absolute configuration
摘要:
Chlorofluoroiodoacetic acid (FCIICCO2H) has been synthesized in four Steps from chlorotrifluoroethylene. Enantio-enriched (+)-chlorofluoroiodomethane 1 [(+)-CHFCII] with 63.3% ee was obtained by stereoselective decarboxylation in triethyleneglycol at 110degreesC and 110 mmHg of the diastereomeric salt {(+)-FCIICCO2H, (-)-strychnine} having 67% de. The enantiomeric excess of (+)-CHFCII was determined by gas chromatography on a chiral modified cyclodextrin stationary phase. The (S)-(+)-/(R)(-)-configurations were assigned by quantum mechanical calculations of the specific rotation Using density functional theory. (C) 2004 Published by Elsevier Ltd.
Preparation of (+)-chlorofluoroiodomethane, determination of its enantiomeric excess and of its absolute configuration
摘要:
Chlorofluoroiodoacetic acid (FCIICCO2H) has been synthesized in four Steps from chlorotrifluoroethylene. Enantio-enriched (+)-chlorofluoroiodomethane 1 [(+)-CHFCII] with 63.3% ee was obtained by stereoselective decarboxylation in triethyleneglycol at 110degreesC and 110 mmHg of the diastereomeric salt {(+)-FCIICCO2H, (-)-strychnine} having 67% de. The enantiomeric excess of (+)-CHFCII was determined by gas chromatography on a chiral modified cyclodextrin stationary phase. The (S)-(+)-/(R)(-)-configurations were assigned by quantum mechanical calculations of the specific rotation Using density functional theory. (C) 2004 Published by Elsevier Ltd.