Synthesis of New 2,6-Prolylxylidide Analogues of Tocainide as Stereoselective Blockers of Voltage-Gated Na<sup>+</sup> Channels with Increased Potency and Improved Use-Dependent Activity
作者:Carlo Franchini、Filomena Corbo、Giovanni Lentini、Gemma Bruno、Antonio Scilimati、Vincenzo Tortorella、Diana Conte Camerino、Annamaria De Luca
DOI:10.1021/jm000931l
日期:2000.10.1
of tocainide chiral analogues were designed, synthesized, and evaluated in vitro, in pure enantiomeric form, as use-dependent blockers of skeletal muscle sodium channels to better understand the structural requirements responsible for the antimyotonic activity. The voltage clamp recordings showed a remarkable increase of both potency and use-dependent behavior with the analogue N-(2, 6-dimethylphe
以纯对映体形式设计,合成和评估了一系列Tocainide手性类似物,作为骨骼肌钠通道的使用依赖型阻断剂,以更好地了解负责抗肌强直活性的结构要求。电压钳记录显示,与类似物N-(2,6-二甲基苯基)-2-吡咯烷甲酰胺(1a)相比,效价和使用依赖行为均显着增加。实际上,(R)-1a在生产滋补剂方面比(R)-托卡尼特强5倍,即在应用该化合物后在静息状态下钠电流峰值降低,但其强效21倍。在高频率刺激(相位阻滞)的情况下。此外,与托卡尼特相反,该化合物也是立体选择性的,(S)-1a的效力比(R)-1a低2-3倍。在1a中引入甲基,取代与氨基氮原子[N-(2,6-二甲基苯基)-1-甲基-2-吡咯烷甲酰胺(2a)]或氢键氮原子[N- (2,6-二甲基苯基)-N-甲基-2-吡咯烷甲酰胺(3a)]出乎意料地导致立体选择性的反转,(S)-对映异构体的效力比(R)-一种强3倍。药的比较表明,(S)-2a和(S)-