Fluorinated analogs of Leu-enkephalin were synthesized by the solution method and the solid-phase method. The synthetic peptides were examined for opioid activities on mouse vas deferens and guinea pig ileum. Among the synthetic peptides, [D-Ala2, Leu(F3)(2R, 4S)5]enkephalin and [D-Ala2, Leu(F3)(2S, 4R)5]enkephalin exhibited potent opioid activity, and [Leu(F3)(2S, 4R)5]enkephalin exhibited high δ-receptor selectivity.
氟化的Leu-内
啡肽类似物通过溶液法和固相法合成。合成的肽在小鼠输精管和豚鼠回肠中进行了阿片活性测试。在合成的肽中,[D-Ala2, Leu(F3)(2R, 4S)5]内
啡肽和[D-Ala2, Leu(F3)(2S, 4R)5]内
啡肽表现出强效的阿片活性,而[Leu(F3)(2S, 4R)5]内
啡肽则表现出较高的δ-受体选择性。