2,3-Dihydro-2-oxo-1<i>H</i>-benzimidazole-1-carboxamides with Selective Affinity for the 5-HT<sub>4</sub> Receptor: Synthesis and Structure−Affinity and Structure−Activity Relationships of a New Series of Partial Agonist and Antagonist Derivatives
作者:Inés Tapia、Luisa Alonso-Cires、Pedro Luis López-Tudanca、Ramón Mosquera、Luis Labeaga、Ana Innerárity、Aurelio Orjales
DOI:10.1021/jm981098j
日期:1999.7.1
reversal of the pharmacological activity due only to a small structural difference might confirm the existence of two binding sites on the 5-HT(4) receptor. In the alkylene spacer, a two-methylene chain is favorable to optimize the affinity and the antagonist or the partial agonist activity. In the ethyl and cyclopropyl series, 5-HT(4) antagonist activity seems to be unrelated to the size of the 4-substituent
合成了一系列带有哌嗪部分的2,3-二氢-2-氧代-1H-苯并咪唑-1-羧酰胺衍生物。他们的体外5-HT(4),5-HT(3)和D(2)受体亲和力通过放射性配体结合测定法进行了评估。对于选定的化合物,通过使用大鼠食管肌膜粘膜(TMM)的预收缩(卡巴胆碱)制剂对5-HT(4)受体进行功能研究。研究了苯并咪唑环的3-取代基,哌嗪部分的4-取代基和亚烷基间隔基的影响。在苯并咪唑环的3位上具有乙基或环丙基取代基的化合物显示出对5-HT(4)受体的中等至高亲和力(K(i)= 6.7-75.4 nM),对5-HT(3)的选择性)和D(2)受体和中等拮抗活性(pK(b)= 6.19-7.73)。在3-苯并咪唑位置具有异丙基取代基的化合物显示出中等和选择性的5-HT(4)亲和力(K(i)> / = 38.9 nM)和部分激动剂活性(5a,ia = 0.94)参考化合物BIMU 8(ia = 0.70)。仅由