Concise Asymmetric Synthesis of (+)-Febrifugine Utilizing<i>trans-</i>Selective Intramolecular Conjugate Addition
作者:Yasuo Takeuchi、Satoshi Sukemoto、Miyo Oshige、Masahiro Sato、Ken-ichiro Mimura、Hiromi Nishioka、Hitoshi Abe、Takashi Harayama
DOI:10.1055/s-2008-1067271
日期:2008.10
Intramolecular conjugate addition of γ-substituted (E)-α,β-unsaturated ketones with a Lewis acid (BF 3 ·OEt 2 ) 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.
γ-取代(E)-α,β-不饱和酮与路易斯酸(BF 3 ·OEt 2 ) 的分子内共轭加成选择性地得到反式-2,3-二取代哌啶衍生物。通过烯胺的Sharpless不对称二羟基化合成手性底物;以共轭加成反应的主要产物为原料合成了抗疟化合物febrifugine。