Temperature-controlled bidirectional enantioselectivity in a dynamic catalyst for asymmetric hydrogenation
Asymmetric catalysis using enantiomerically pure catalysts is one of the most widely used methods for the preparation of enantiomerically pure compounds. The separate synthesis of both enantiomerically pure compounds requires tedious and time-consuming preparation of both enantiomerically pure catal...
Gespeichert in:
| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
February 23, 2015
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| In: |
Angewandte Chemie. International edition
Year: 2015, Jahrgang: 54, Heft: 12, Pages: 3580-3586 |
| ISSN: | 1521-3773 |
| DOI: | 10.1002/anie.201412098 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1002/anie.201412098 Verlag, lizenzpflichtig, Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1002/anie.201412098 
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| Verfasserangaben: | Golo Storch and Oliver Trapp |
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| 520 | |a Asymmetric catalysis using enantiomerically pure catalysts is one of the most widely used methods for the preparation of enantiomerically pure compounds. The separate synthesis of both enantiomerically pure compounds requires tedious and time-consuming preparation of both enantiomerically pure catalysts or chiral separation of the racemic products. Here, we report a stereochemically flexible diastereomeric rhodium(I) catalyst for asymmetric hydrogenations of prochiral (Z)-α-acetamidocinnamates and α-substituted acrylates, which changes its enantioselectivity depending on the temperature to produce each enantiomerically pure compound in high yield with constant high enantioselectivity over time. The same axially chiral rhodium(I) catalyst produces (R)-phenylalanine derivatives in enantiomeric ratios of up to 87:13 (R/S) at low temperature and up to 3:97 (R/S) of the corresponding S enantiomers after re-equilibration of the same catalyst at elevated temperature. | ||
| 650 | 4 | |a asymmetric amplification | |
| 650 | 4 | |a asymmetric synthesis | |
| 650 | 4 | |a hydrogenation | |
| 650 | 4 | |a ligand design | |
| 650 | 4 | |a tropos biaryls | |
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