The anticonvulsant activities of N-benzyl 3-methoxypropionamides
摘要:
We recently reported that the ED(50) value for (R,S)-2,3-dimethoxypropionamide (1) in the maximal electroshock (MES)induced seizure test in mice was 30 mg/kg (Choi, D.; Stables, J.P., Kohn, H. Bioorg. Med. Chem. 1996, 4, 2105). This value is comparable to that observed for phenobarbital (ED(50) = 22 mg/kg). Compound 1 is structurally similar to a class of MES-selective anticonvulsant agents, termed functionalized amino acids (2), that were developed in our laboratory. The distinguishing feature of 2 is the differential activities observed for enantiomers. In this study, we asked whether comparable differences in activities were observed in the MES-induced seizure test for (R)- and (S)-1. We developed stereospecific syntheses for these enantiomers and showed that both compounds exhibit nearly equal anticonvulsant activity in mice (ip) (MES ED(50) = 79-111 mg/kg). The surprisingly high ED(50) values for (R)- and (S)-1 required our redetermining the ED(50) value for (R,S)-1. We revised this value to 79 mg/kg. A limited structure-activity relationship study for 1 was conducted. Special attention was given to the C(2) methoxy unit in 1. We found that replacement of this moiety led to only modest differences in the MES activities upon ip administration to mice. Significantly we observed an enhancement in the anticonvulsant activity for (R,S)-N-benzyl 2-hydroxy-3-methoxypropionamide ((R,S)-6) upon oral administration to rats ((R,S)-6: mice tip) ED(50) > 100, < 300 mg/kg; rat (oral) ED(50) = 62 mg/kg), The activities of 3-methoxypropionamides, functionalized amino acids, and related compounds are discussed. (C) 1999 Elsevier Science Ltd. All rights reserved.
Several polyols, which are easily available from sugars through biochemical conversion or hydrogenolytic cleavage, are directly converted into carboxylicacids and amides. This efficient dehydrogenativecoupling process, catalyzed by a rhodium(I) diolefin amido complex, is an attractive approach for the production of organic fine chemicals from renewable resources. This method tolerates the presence
Metal‐Catalyst‐Free One‐Pot Aqueous Synthesis of <i>trans</i>‐1,2‐Diols from Electron‐Deficient <i>α</i>,<i>β</i>‐Unsaturated Amides via Epoxidation Using Oxone as a Dual Role Reagent
First general one-pot direct trans-dihydroxylation of electron-deficient α,β-unsaturatedamides was developed. Trans-1,2-diols were produced, rather than cyclizing nitrogen-containing heterocycles by using inorganic oxone as a dual-role reagent in water. This reaction allowed operational simplicity, switchable selectivity, broad substrate scope, no metal pollution and organic waste generation.
The anticonvulsant activities of functionalized N-benzyl 2-acetamidoacetamides. The importance of the 2-acetamido substituent
作者:Daeock Choi、James P Stables、Harold Kohn
DOI:10.1016/s0968-0896(96)00225-8
日期:1996.12
Recent studies have demonstrated that substituted N-benzyl 2-acetamidoacetamides provide significant protection against maximal electroshock (MES)-induced seizures in mice and rats. In this study, we investigated whether the 2-acetamido moiety was necessary for anticonvulsant activity. Ten derivatives of the known anticonvulsant, N-benzyl 2-acetamido-2-phenyl acetamide were prepared in which the 2-acetamido group was replaced by hydrogen, methyl, oxygen, and halogen substituents. Evaluation of these compounds in the MES-induced seizure test demonstrated that both the hydroxy and the methoxy compounds provided full protection against MES-induced seizures in mice given ip at 100 mg/kg. Moreover, evaluation of the individual stereoisomers for the hydroxy compound showed that the principal activity resided in the (R)-isomer. These findings demonstrated that the 2-acetamido substituent is important but not obligatory for the prevention of MES-induced seizures. Further supporting evidence was provided by comparing the pharmacological activities of N-benzyl 2,3-dimethoxypropionamide with N-benzyl 2-acetamido-3-methoxypropionamide. The ED(50) value for the former in the MES test was 30 mg/kg (ip), which compared favorably with phenobarbital (ED(50) = 22 mg/kg), but the ED(50) value for N-benzyl 2-acetamido-3-methoxypropionamide was 8.3 mg/kg. Copyright (C) 1996 Elsevier Science Ltd
US5880158A
申请人:——
公开号:US5880158A
公开(公告)日:1999-03-09
[EN] PROPIONAMIDE DERIVATIVES AND THEIR USE AS ANTICONVULSANTS<br/>[FR] DERIVES DE PROPIONAMIDE ET LEUR UTILISATION COMME ANTICONVULSIFS
申请人:RESEARCH CORPORATION TECHNOLOGIES, INC.
公开号:WO1998013336A1
公开(公告)日:1998-04-02
(EN) The present invention is directed to a compound useful as an anticonvulsant. The compound has formula (I); X2R1 when X2=S, HX2R1 when X2=S.(FR) La présente invention concerne un composé utilisé en tant qu'anticonvulsif. Le composé est de formule (I), X2R1 lorsque X2=S, HX2R1 lorsque X2=S.