Optically Active Mexiletine Analogues as Stereoselective Blockers of Voltage-Gated Na<sup>+</sup> Channels
作者:Carlo Franchini、Alessia Carocci、Alessia Catalano、Maria M. Cavalluzzi、Filomena Corbo、Giovanni Lentini、Antonio Scilimati、Paolo Tortorella、Diana Conte Camerino、Annamaria De Luca
DOI:10.1021/jm030865y
日期:2003.11.1
Optically active mexiletine analogues were synthesized and evaluated in vitro as use-dependent blockers of skeletal muscle sodium channels. The mexiletine analogues were obtained by replacing either the methyl group on the stereogenic center of mexiletine [1-(2,6-dimethylphenoxy)propan-2-amine] with a phenyl group or modifying the phenoxy moiety (by removal of one or both of the methyl groups, or introducing
合成了旋光美西律类似物,并在体外评估为骨骼肌钠通道的使用依赖性阻断剂。美西律类似物是通过用苯基取代美西律[1-(2,6-二甲基苯氧基)丙-2-胺]的立体构型中心上的甲基或修饰苯氧基部分(通过除去一个或两个)来获得的甲基,或引入氯原子),或两者兼而有之。电压钳记录表明,无论芳氧基部分的取代方式如何,所有在立体中心(3a-f)上带有苯基的化合物在滋补和相阻方面均比美西律更具活性。该观察结果与美西律的观察结果相反,在美西律中,从芳氧基部分除去两个甲基均导致效力显着降低。最有效的同类物,(R)-2-(2-甲基苯氧基)-1-苯基乙胺[[R] -3b],在产生补品阻滞(即还原)方面的效力比(R)-美西律高27倍化合物在静止状态下钠电流峰值的变化。(R)-3b保持了与使用有关的行为,在高频率刺激(阶段性阻滞)下的效用提高了23倍。尽管用美西律观察到了什么,但立体选择性在相阻条件下保持不变。立体选择性指数通常较低,范围为1-4,但除了2