Synthesis and enantiopharmacology of new AMPA-kainate receptor agonists.

Abstract:

:Regioisomeric 3-carboxyisoxazolinyl prolines [CIP-A (+/-)-6 and CIP-B (+/-)-7] and 3-hydroxyisoxazolinyl prolines [(+/-)-8 and (+/-)-9] were synthesized and assayed for glutamate receptor activity. The tests were carried out in vitro by means of receptor binding techniques, second messenger assays, and the rat cortical wedge preparation. CIP-A showed a good affinity for both 2-amino-3-(3-hydroxy-5-methylisoxazol-4-yl)propionic acid (AMPA) and kainic acid (KAIN) receptors. These results were confirmed in the cortical slice model where CIP-A displayed an EC(50) value very close to that of AMPA. The convulsant properties of all the compounds were evaluated in vivo on DBA/2 mice after icv injection. CIP-A showed a convulsant activity, measured as tonus and clonus seizures, 18-65 times higher than that produced by AMPA. It was also quite active after ip administration, since it induced seizures in mice at doses as low as 3.2 nmol/mouse. On the basis of the above-reported results we prepared and tested the enantiomers of CIP-A and CIP-B, obtained by reacting (S)-3,4-didehydroproline and (R)-3,4-didehydroproline, respectively, with ethoxycarbonylformonitrile oxide. In all the tests the S-form, CIP-AS [(-)-6], emerged as the eutomer evidencing common stereochemical requirements with the reference compounds AMPA and KAIN. Through modeling studies, carried out on CIP-A, AMPA, and KAIN, active conformations for CIP-AS and AMPA at AMPA receptors as well as for CIP-AS and KAIN at KAIN receptors are suggested.

journal_name

J Med Chem

authors

Conti P,De Amici M,De Sarro G,Rizzo M,Stensbøl TB,Bräuner-Osborne H,Madsen U,Toma L,De Micheli C

doi

10.1021/jm991081g

keywords:

subject

Has Abstract

pub_date

1999-10-07 00:00:00

pages

4099-107

issue

20

eissn

0022-2623

issn

1520-4804

pii

jm991081g

journal_volume

42

pub_type

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