Discovery and anticonvulsant activity of the potent metabolic inhibitor 4-amino-N-(2,6-dimethylphenyl)-3,5-dimethylbenzamide.

Abstract:

:Compound 2 [4-amino-N-(2,6-dimethylphenyl)benzamide] is an effective anticonvulsant in several animal models. For example, following oral administration to mice, it antagonized maximal electroshock (MES) induced seizures with an ED50 of 1.7 mg/kg. During drug disposition studies with 2, we found that it was rapidly metabolized by N-acetylation. Thirty minutes after oral administration of 1.7 mg/kg of 2 to mice, plasma concentrations of parent drug and the N-acetyl metabolite 5 were 1.09 and 0.41 microgram/mL, respectively. Six hours postadministration the concentrations were 0.23 and 0.22 microgram/mL, respectively. In order to sterically preclude or diminish the rate of metabolic N-acetylation, we synthesized analogues of 2 possessing either one (3) or two (4) methyl groups ortho to the 4-amino substituent. Both compounds antagonized MES-induced seizures after administration to mice; oral ED50 values for 3 and 4 were 3.5 and 5.6 mg/kg, respectively. Compound 3 was rapidly metabolized by N-acetylation. However, 4 provided exceptionally high and long-lived plasma concentrations of parent drug; no N-acetyl metabolite could be detected. While 2 and 3 had no pharmacologically relevant effects on hexobarbital-induced sleeping time in mice, 4 was a potent, dose-dependent potentiator of sleeping time. Oral administration of 375 micrograms/kg led to a 61% increase in sleeping time relative to control values. Thus, 4 represents one of the most potent potentiators of hexobarbital-induced sleeping time described to date.

journal_name

J Med Chem

authors

Robertson DW,Leander JD,Lawson R,Beedle EE,Clark CR,Potts BD,Parli CJ

doi

10.1021/jm00393a010

subject

Has Abstract

pub_date

1987-10-01 00:00:00

pages

1742-6

issue

10

eissn

0022-2623

issn

1520-4804

journal_volume

30

pub_type

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