作者:Damien Boeglin、Annie Heitz、Jean Martinez、Jean-Alain Fehrentz
DOI:10.1002/ejoc.200300148
日期:2003.8
A straightforward synthesis of 2,6-disubstituted piperidines bearing α-amino acid side-chains was developed. Synthesis was based on a Horner−Wadsworth−Emmons condensation of a β-ketophosphonate derived from an α-amino acid residue with a β-homologated aldehyde of an N-protected amino acid residue. The generated α-β unsaturated ketones were then reduced, deprotected, and cyclized in a hydrogenation/hydrogenolysis
开发了带有 α-氨基酸侧链的 2,6-二取代哌啶的直接合成。合成基于衍生自α-氨基酸残基的β-酮膦酸酯与N-保护氨基酸残基的β-同源醛的Horner-Wadsworth-Emmons缩合。然后将生成的 α-β 不饱和酮还原、脱保护并在氢化/氢解一锅法中环化以产生哌啶部分。在获得的分子中引入新的构象限制允许通过 NMR 实验完全分配立体中心。这项分配使我们能够在环化过程中提出一条机械途径,解释环外碳中心构型的丢失。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)