Synthesis 2008(19): 3081-3087  
DOI: 10.1055/s-2008-1067271
PAPER
© Georg Thieme Verlag Stuttgart ˙ New York

Concise Asymmetric Synthesis of (+)-Febrifugine Utilizing trans-Selective Intramolecular Conjugate Addition

Satoshi Sukemotoa, Miyo Oshigea, Masahiro Satoa, Ken-ichiro Mimuraa, Hiromi Nishiokaa, Hitoshi Abeb, Takashi Harayamac, Yasuo Takeuchi*a
a Faculty of Pharmaceutical Sciences, Okayama University, Tsushima-naka 1-1-1, Okayama 700-8530, Japan
Fax: +81(86)2517964; e-Mail: take@pharm.okayama-u.ac.jp;
b Faculty of Engineering, Toyama University, Gofuku 3190, Toyama 930-8555, Japan
c Faculty of Pharmaceutical Sciences at Kagawa Campus, Tokushima Bunri University, Shido, Sanuki 769-2193, Japan
Further Information

Publication History

Received 13 May 2008
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.

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Conjugate addition with TMSOTf (Lewis acid) also selectively afforded the trans adducts.