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Comparative Study
Journal Article
Imidazole anticonvulsants: structure-activity relationships of [(biphenylyloxy)alkyl]imidazoles.
Journal of Medicinal Chemistry 1987 May
The [(biphenylyloxy)alkyl]imidazoles were found to be potent anticonvulsants. The most potent compound of the series, 1-[2- ([1,1'-biphenyl]-2-yloxy)ethyl]-1H-imidazole (4), had an ED50 of 15.5 mg/kg against maximal-electroshock-induced seizures in mice after oral administration; the horizontal screen ED50 was 320 mg/kg, revealing that the compound has a protective index of 21. Homologues bearing three- and four-carbon tethers between the imidazole and biphenylyloxy moieties were also active, but their potency was attenuated relative to 4. Congeners with the imidazolylalkoxy moiety at the meta or para positions of biphenyl were also less active. All these compounds were potent potentiators of hexobarbital-induced sleeping time in mice, presumably via the well-known imidazole-mediated inhibition of cytochrome P-450. The structural features governing the anticonvulsant and sleeping-time activities appear to be distinct, but a complete dissociation of these two effects has not been achieved. Thus, the potential of these compounds as clinically useful antiepileptic drugs would appear to be limited.
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