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Metal-catalyzed asymmetric oxidations.
1Institut für Organische Chemie der RWTH Aachen, Professor-Pirlet-Str.1, D-52056 Aachen, Germany. Carsten.Bolm@oc.RWTH-Aachen.de
Medicinal Research Reviews
|September 30, 1999
Summary
New metal catalysts enable highly enantioselective oxidations of ketones and sulfides. These reactions yield optically active lactones and sulfoxides, which are further transformed into novel beta-amino acid analogues for peptide research.
Area of Science:
- Organic Chemistry
- Asymmetric Catalysis
- Medicinal Chemistry
Background:
- Enantioselective synthesis is crucial for pharmaceuticals.
- Metal-catalyzed oxidations offer efficient routes to chiral molecules.
- Sulfoxides and their derivatives are valuable synthetic intermediates.
Purpose of the Study:
- To present recent advances in enantioselective metal-catalyzed oxidations.
- To detail asymmetric Baeyer-Villiger reactions and sulfide oxidations.
- To explore the synthesis of beta-amino acid analogues from sulfoximines.
Main Methods:
- Development of new metal/ligand combinations for catalysis.
- Asymmetric Baeyer-Villiger oxidation of cyclic ketones.
- Stereospecific imination of sulfoxides to sulfoximines.
- Modification of sulfoximines into pseudo-amino acids.
Main Results:
- High enantioselectivities achieved in both ketone and sulfide oxidations (ee > 90% for some substrates).
- Optically active lactones and enantiomerically enriched sulfoxides synthesized.
- Enantiopure sulfoximines obtained via stereospecific imination.
- Novel beta-amino acid analogues and pseudopeptides synthesized.
Conclusions:
- Novel metal catalysts significantly advance enantioselective oxidation reactions.
- Sulfoximine derivatives provide a versatile platform for creating peptide analogues.
- These findings open new avenues in asymmetric synthesis and drug discovery.