Abstract:
:A series of 3-substituted [1,2,4]triazino[4,3-c]benzimidazoles V were prepared and tested at the central benzodiazepine receptor (BzR). These compounds were designed as rigid analogues of the previously described N-benzylindolylglyoxylylamide derivatives IV. The title compounds V showed an affinity which depended directly on the presence of the N(10)-H group and an aromatic ring at position 3. Some of them elicited a 2- or 3-fold higher affinity with respect to that of the indolylglyoxylylamide derivatives IV (R = H). The GABA ratio and [(35)S]-tert-butylcyclophosphorothionate binding data revealed an efficacy profile of partial inverse agonists/antagonists for compounds 1c,e,f,j,k, and of a partial agonist for 2c. This last compound proved to be effective in antagonizing pentylenetetrazole-induced seizures in mice. Attempts were made to interpret the structure-affinity relationships of compounds V in the light of possible tautomeric equilibria involving the ligands.
journal_name
J Med Chemjournal_title
Journal of medicinal chemistryauthors
Primofiore G,Da Settimo F,Taliani S,Marini AM,La Motta C,Novellino E,Greco G,Gesi M,Trincavelli L,Martini Cdoi
10.1021/jm991131hkeywords:
subject
Has Abstractpub_date
2000-01-13 00:00:00pages
96-102issue
1eissn
0022-2623issn
1520-4804pii
jm991131hjournal_volume
43pub_type
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