Synthesis, Physicochemical Properties, Anticonvulsant Activities, and GABA-ergic and Voltage-sensitive Calcium Channel Receptor Affinities of α-SubstitutedN-Benzylamides of γ-Hydroxybutyric Acid Part 4: Search for New Anticonvulsant Compounds
作者:Barbara Malawska、Katarzyna Kulig、Lucyna Antkiewicz-Michaluk、Richard Porter、Ani Misra、Ian A. Cliffe
DOI:10.1002/(sici)1521-4184(19995)332:5<167::aid-ardp167>3.0.co;2-n
日期:1999.5
In a search for new anticonvulsant compounds, two series of N-benzylamides of alpha-(benzylamino)-gamma-hydroxybutyric acid (series A) and alpha-(2-phenylethylamino)-gamma-hydroxybutyric acid (series B), were investigated in maximal electroshock (MES), subcutaneous metrazole, and rotorod toxicity assays. The most,potent anticonvulsant compounds were alpha-(benzylamino)-gamma-hydroxybutyric acid N-benzylamide (3) and N-(2-chlorobenzyl-amide (4) with median effective (ED50) doses 63.0 mg/kg and , respectively. alpha-(4-Phenylpiperazinyl-gamma-hydroxy-butyric acid N-(4-methylbenzyl)amide (17) and alpha-(benzylpiperaz-inyl-gamma-hydroxy-butyric acid N-(4-methylbenzyl)amide (18) were also tested for their ability to potentiate [H-3] -muscimol binding and Ifo inhibit [S-35]-TBPS binding (as indices of GABA-A receptor potentiation). Amide 17 exhibited activity at the GABA-A complex which may be the mechanism by which the anticonvulsant effect of this compound is mediated. The N-benzylamides of alpha-(benzylamino)-gamma-hydroxybutyric acid (3-9) were also evaluated for their ability to displace [H-3] nitrendipine from voltage-sensitive calcium channel (VSCC) receptors isolated from rat cortex.