Structure−Activity Relationships of Methoctramine-Related Polyamines as Muscular Nicotinic Receptor Noncompetitive Antagonists. 3. Effect of Inserting the Tetraamine Backbone into a Macrocyclic Structure
作者:Maria L. Bolognesi、M. Gabriele Bixel、Gabriella Marucci、Manuela Bartolini、Michael Krauss、Piero Angeli、Alessandra Antonello、Michela Rosini、Vincenzo Tumiatti、Ferdinand Hucho、Carlo Melchiorre
DOI:10.1021/jm020835f
日期:2002.7.1
prototypes, were potent noncompetitive antagonists at both frog and Torpedo nAChRs, suggesting that polyamines do not need to be linear or in extended conformation to optimally interact with the nicotinic channel; rather, they may bind in a U-shaped conformation. Relative to muscarinic activity, macrocyclic compounds 10, 13, 14, and 20, in contrast with the profile displayed by 2, were almost devoid of
本文扩展了对聚亚甲基四胺结构-活性关系的另一个方面的研究,即,将四胺主链插入大环结构的作用。为此,通过将原型甲基辛特拉明2的两个末端氮原子连接至芳基部分来设计化合物8-12。或者,首先将2修饰以获得化合物6和7,然后通过将两个末端伯胺官能团连接到聚苯基间隔基上将其环化,得到13-20。所有化合物均在肌肉型nAChRs上进行了测试,并且大多数化合物也在AChE上测试。此外,所选的化合物也在外围M(2)和M(3)mAChRs上进行了测试。所有这些环状衍生物都像原型一样,在青蛙和鱼雷nAChRs上都是有效的非竞争性拮抗剂,提示多胺不需要为线性或延伸构象即可与烟碱通道最佳相互作用;相反,它们可能以U形构象结合。相对于毒蕈碱活性,大环化合物10、13、14和20与2显示的特征相反,几乎没有亲和力。推导出芳基间隔基不利于多胺与mAChR的相互作用。最后,在这项研究中研究的所有二胺二酰胺在抑制AChE活