5-HT<sub>3</sub> Antagonists Derived from Aminopyridazine-type Muscarinic M1 Agonists
作者:Yveline Rival、Rémy Hoffmann、Bruno Didier、Volodymyr Rybaltchenko、Jean-Jacques Bourguignon、Camille G. Wermuth
DOI:10.1021/jm9705418
日期:1998.1.1
of the muscarinic M1 pharmacophore: (i) a protonable basic or quaternary nitrogen acting as a cationic head; (ii) an electronegative dipole usually part of a planar mesomeric ester, amide, or amidine function which can be replaced by an ether (muscarine) or a dioxolane (AF 30); (iii) an intercharge distance of 5 +/- 0.5 A between the cationic head and the electronegative atom of the dipole; (iv) an elevation
对毒蕈碱M1激动剂进行的构象分析确定了毒蕈碱M1药效团的四个结构特征:(i)质子化的碱性或季氮充当阳离子头;(ii)带负电的偶极子,通常是平面美索美酯,酰胺或am官能团的一部分,可以用醚(毒蕈碱)或二氧戊环(AF 30)代替;(iii)阳离子头与偶极子的负电性原子之间的充电距离为5 +/- 0.5 A;(iv)在包含负电偶极子的平面上,阳离子头的高度升高0.5 +/- 0.03A。在重新研究已公开的5-HT3拮抗剂结构的构象行为期间,对5-HT3药效团观察到了相似的特征。但是,许多5-HT3拮抗剂具有毒蕈碱M1激动剂中不存在的其他芳香族平面。这些观察结果使我们能够预测将毒蕈碱型M1激动剂变为5-HT3拮抗剂的化学修饰。实际上已合成了四种预测的氨基哒嗪并进行了测试。与5-HT3受体结合([3H] BRL 43694)的观察到的IC50值为10至425 nM,而对毒蕈碱受体制剂([3H]哌仑西平)的亲和力超过10