(3SR,4aRS,6SR,8aRS)-6-(1H-tetrazol-5-yl)decahydroisoquinoline-3-carboxylic acid, a novel, competitive, systemically active NMDA and AMPA receptor antagonist.
We report the synthesis and characterization of 6 (LY246492), which is a competitive N-methyl-D-aspartate (NMDA) and 2-amino-3-(3-hydroxy-5-methylisoxazol-4-yl)propanoic acid (AMPA) receptor antagonist. Tetrazole-substituted amino acid 6 was prepared in four steps from the recently described aldehyde 7. The optical isomers (-)-6 and (+)-6 were obtained from the same sequence of reactions using the corresponding isomers of 7. The compound displaces both NMDA and AMPA receptor binding and antagonizes depolarizations in cortical slices evoked by both NMDA and AMPA. In mice and pigeons, the compound showed antagonism of responses mediated through NMDA and AMPA receptors. Using the resolved optical isomers of 6, both NMDA and AMPA antagonist activities were found to reside in a single isomer, (-)-6.
Ornstein
P L
PL
Lilly Research Laboratories, A Division of Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana 46285, USA.
Arnold
M B
MB
Allen
N K
NK
Leander
J D
JD
Tizzano
J P
JP
Lodge
D
D
Schoepp
D D
DD
D000818:Animals; D001667:Binding, Competitive; D010856:Columbidae; D018691:Excitatory Amino Acid Antagonists / Q000138:chemical synthesis* / Q000494:pharmacology; D007546:Isoquinolines / Q000138:chemical synthesis* / Q000494:pharmacology; D051379:Mice; D015394:Molecular Structure; D018091:Receptors, AMPA / Q000037:antagonists & inhibitors*; D018092:Kainic Acid Receptors / Q000187:drug effects; D016194:Receptors, N-Methyl-D-Aspartate / Q000037:antagonists & inhibitors*; D013777:Tetrazoles / Q000138:chemical synthesis* / Q000494:pharmacology
D018691:Excitatory Amino Acid Antagonists; D007546:Isoquinolines; D018091:Receptors, AMPA; D018092:Kainic Acid Receptors; D016194:Receptors, N-Methyl-D-Aspartate; D013777:Tetrazoles; C097234:LY 246492