Enantioselective Synthesis of the Excitatory Amino Acid (1<i>S,</i>3<i>R</i>)-1-Aminocyclopentane-1,3-dicarboxylic Acid
作者:Daniel M. Bradley、Renameditswe Mapitse、Nicholas M. Thomson、Christopher J. Hayes
DOI:10.1021/jo025892v
日期:2002.11.1
synthesis of the alpha,alpha-dialkyl-alpha-amino acid (1S,3R)-ACPD has been achieved using an alkylidene carbene 1,5-CH insertion reaction as a key step. The ketone cyclization precursor was synthesized from Garner's aldehyde in high yield via a Wittig homologation and subsequent catalytic hydrogenation. Treatment of the ketone with 1.2 equiv of lithio(trimethylsilyl)diazomethane in THF resulted in
使用亚烷基卡宾1,5-CH插入反应作为关键步骤,实现了α,α-二烷基-α-氨基酸(1S,3R)-ACPD的对映选择性合成。酮环化前体是由加纳的醛经Wittig同源和随后的催化氢化反应高收率合成的。用THF中的1.2当量的硫代(三甲基甲硅烷基)重氮甲烷处理酮,以62-69%的收率以高对映体过量形成相应的含环戊烯的CH-插入产物。随后的官能团操作使氨基酸(1S,3R)-ACPD的合成得以完成。