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Synthesis 2008(19): 3081-3087
DOI: 10.1055/s-2008-1067271
DOI: 10.1055/s-2008-1067271
PAPER
© Georg Thieme Verlag
Stuttgart ˙ New York
Concise Asymmetric Synthesis of (+)-Febrifugine Utilizing trans-Selective Intramolecular Conjugate Addition
Further Information
Received
13 May 2008
Publication Date:
05 September 2008 (online)
Publication History
Publication Date:
05 September 2008 (online)
Abstract
Intramolecular conjugate addition of γ-substituted (E)-α,β-unsaturated ketones with a Lewis acid (BF3˙OEt2) selectively afforded trans-2,3-disubstituted piperidine derivatives. Chiral substrates were synthesized by Sharpless asymmetric dihydroxylation of the enamine; the antimalarial compound febrifugine was synthesized from the major product of the conjugate addition reaction.
Key words
Lewis acid - intramolecular conjugate addition - febrifugine - asymmetric synthesis
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References
Conjugate addition with TMSOTf (Lewis acid) also selectively afforded the trans adducts.