Synthesis of the constrained glutamate analogues (2S,1′R,2′R)- and (2S,1′S,2′S)-2-(2′-carboxycyclobutyl)glycines L-CBG-II and L-CBG-I by enzymatic transamination
摘要:
Optically pure trans-cyclobutane analogues of glutamic acid are prepared by highly selective enzymatic transamination of a single racemic trans-cyclobutane alpha-ketoglutaric acid derivative 5, which is synthesized in five steps from maleic anhydride. (2S,1'R,2'R)- and (2S,I'S,2'S)-2-(2'-carboxycyclobutyl)glycines L-CBG-II and L-CBG-I are obtained using aspartate aminotransferase (AAT) and branched chain aminotransferase (BCAT), respectively. (c) 2005 Elsevier Ltd. All rights reserved.
Stereoselective Chemoenzymatic Synthesis of the Four Stereoisomers of <scp>l</scp>-2-(2-Carboxycyclobutyl)glycine and Pharmacological Characterization at Human Excitatory Amino Acid Transporter Subtypes 1, 2, and 3
作者:Sophie Faure、Anders A. Jensen、Vincent Maurat、Xin Gu、Emmanuelle Sagot、David J. Aitken、Jean Bolte、Thierry Gefflaut、Lennart Bunch
DOI:10.1021/jm060822s
日期:2006.11.1
the corresponding cis and trans-2-oxalylcyclobutanecarboxylic acids 5 and 6 using the enzymes aspartate aminotransferase (AAT) and branched chain aminotransferase (BCAT) from Escherichia coli. The four stereoisomeric compounds were evaluated as potential ligands for the human excitatoryaminoacidtransporters, subtypes1, 2, and 3 (EAAT1, EAAT2, and EAAT3) in the FLIPR membrane potential assay. While
Photocycloaddition of α,β-unsaturated-γ-lactam with ethylene. Synthesis of conformationally restricted glutamate analogs, l-2-(2-carboxycyclobutyl)glycines
Both (2S,1′S,2′S)- and (2S,1′S,2′R)-isomers of 2-(2-carboxycyclobutyl)glycine (CBG-I, 1b) and (CBG-III, 2b) are synthesized in a stereoselective manner via a [2+2] photocycloaddition of α,β-unsaturated-γ-lactam 3 with ethylene in acetone. The extended type of isomer 1b showed a weak activity on group II metabotropic glutamate receptors (mGluR2) of rat brain.