Azetidinic amino acids: stereocontrolled synthesis and pharmacological characterization as ligands for glutamate receptors and transporters
作者:Hans Bräuner-Osborne、Lennart Bunch、Nathalie Chopin、François Couty、Gwilherm Evano、Anders A. Jensen、Mie Kusk、Birgitte Nielsen、Nicolas Rabasso
DOI:10.1039/b509514j
日期:——
azetidinic amino acids, that can be envisioned as C-4 alkyl substituted analogues of trans-2-carboxyazetidine-3-acetic acid (t-CAA) and/or conformationally constrained analogues of (R)- or (S)-glutamic acid (Glu) have been synthesized in a diastereo- and enantiomerically pure form from beta-amino alcohols through a straightforward five step sequence. The key step of this synthesis is an original anionic
一组十个氮杂环丁烷氨基酸,可以设想为反式-2-羧基氮杂环丁烷-3-乙酸(t-CAA)的C-4烷基取代类似物和/或(R)-或(S)的构象约束类似物谷氨酸(Glu)已通过简单的五个步骤从β-氨基醇合成为非对映体和对映体纯形式。该合成的关键步骤是原始的阴离子4-exo-tet闭环,该闭环在分子内迈克尔加成后形成氮杂环丁烷环。事实证明,该反应是可逆的,并导致两种非对映异构体的热力学分布,这些非对映异构体易于分离并分两步转化为氮杂环丁烷氨基酸。在天然离子型Glu受体的结合研究中以及在分别代表I,II和III组mGlu受体的克隆的代谢型受体mGluR1、2和4的功能测定中,表征了氮杂环丁烷35-44。此外,在FLIPR膜电位(FMP)测定中,氮杂环丁烷类似物35、36和40也被表征为谷氨酸转运蛋白亚型EAAT1-3的潜在配体。(2R)-氮杂环丁烷35、37、39、41和43在iGlu,mGlu和EAA