Synthesis of the Four Stereoisomers of 1-Amino-2-(hydroxymethyl)cyclobutanecarboxylic Acid and Their Biological Evaluation as Ligands for the Glycine Binding Site of the NMDA Receptor
作者:Claus-Jürgen Koch、G. Höfner、Kurt Polborn、Klaus Theodor Wanner
DOI:10.1002/ejoc.200200673
日期:2003.6
A synthesis of all four stereoisomers [(1S,2S)-, (1R,2R)-, (1S,2R)-, (1R,2S)-] of 1-amino-2-(hydroxymethyl)cyclobutanecarboxyclic acid is presented. The synthesis is based on the chiral glycine equivalent 1, employed in both enantiomeric forms. The key step involves the cyclization of the silyl-protected iodohydrins 5a−d to the corresponding spiro derivatives 6a−d with the aid of the phosphazenic base
介绍了 1-氨基-2-(羟甲基)环丁烷羧酸的所有四种立体异构体 [(1S,2S)-, (1R,2R)-, (1S,2R)-, (1R,2S)-] 的合成。该合成基于手性甘氨酸等价物 1,以两种对映体形式使用。关键步骤涉及在磷腈碱 tBu-P4 的帮助下将甲硅烷基保护的碘醇 5a-d 环化为相应的螺衍生物 6a-d。发现最终化合物作为 NMDA 受体甘氨酸结合位点的配体显示出中等效力。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)