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DOI: 10.1055/s-0029-1216635
Enantioselectivity Switch in Direct Asymmetric Aminoxylation Catalyzed by Binaphthyl-Based Chiral Secondary Amines
Publication History
Publication Date:
14 April 2009 (online)

Abstract
Binaphthyl-based amino acids (S)-1 and an aminosulfonamide (S)-2 were applied for direct asymmetric aminoxylation with nitrosobenzene. In the presence of either (S)-1 or (S)-2, the aminoxylation of aldehydes proceeded smoothly, and subsequent reduction with NaBH4 gave 2-aminoxyl alcohols with good to excellent enantioselectivities. In each case, binaphthyl-based chiral amine catalysts (S)-1 and (S)-2, which have the identical axial chirality, gave opposite enantiomers as the major product. This method represents a rare example of the direct asymmetric aminoxylation by a non-proline type catalyst.
Key words
enamine catalysis - asymmetric aminoxylation - organocatalyst
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References
CCDC-710886 contains the supplementary crystallographic data of (S)-2˙HCl salt for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/data_request/cif.