Synthesis and Structure−Activity Relationships of Potent and Orally Active 5-HT<sub>4</sub> Receptor Antagonists: Indazole and Benzimidazolone Derivatives
作者:John M. Schaus、Dennis C. Thompson、William E. Bloomquist、Alice D. Susemichel、David O. Calligaro、Marlene L. Cohen
DOI:10.1021/jm970857f
日期:1998.5.1
aminoalkylene chain led to potent 5-HT4 receptor antagonists. In particular, those systems in which the basic amine was substituted with groups capable of forming hydrogen bonds showed increased 5-HT4 receptor antagonist activity. While some of these compounds displayed high affinity for other neurotransmitter receptors (in particular, 5-HT3, alpha1, and 5-HT2A receptors), as the conformational flexibility
合成了一系列的吲哚-3-羧酰胺,吲唑-3-羧酰胺和苯并咪唑啉酮-3-羧酰胺,并评估了对大鼠食道中5-HT4受体的拮抗剂亲和力。与相应的吲哚类似物相比,吲唑和苯并咪唑酮系列中的3-内环戊胺衍生物具有更大的5-HT4受体亲和力。通过在芳香杂环的N-1烷基化进一步提高了5-HT4受体拮抗剂的亲和力。在一系列的1-异丙基吲唑-3-羧酰胺中,用单环哌啶环系统或无环氨基亚烷基链取代双环托烷环系统导致了有效的5-HT4受体拮抗剂。特别地,其中碱性胺被能够形成氢键的基团取代的那些系统显示出增加的5-HT 4受体拮抗剂活性。尽管这些化合物中的一些对其他神经递质受体(特别是5-HT3,α1和5-HT2A受体)表现出高亲和力,但随着胺部分构象柔韧性的提高,对5-HT4受体的选择性也提高了。从这一系列化合物中,我们确定了LY353433(1-(1-甲基乙基)-N- [2- [4-[(三环[3.3.1.1(3,7)]癸-1-基羰基)氨基]