Synthesis and Structure–Affinity Relationships of Selective High-Affinity 5-HT<sub>4</sub> Receptor Antagonists: Application to the Design of New Potential Single Photon Emission Computed Tomography Tracers
作者:Emmanuelle Dubost、Noé Dumas、Christine Fossey、Rosa Magnelli、Sabrina Butt-Gueulle、Céline Ballandonne、Daniel H. Caignard、Fabienne Dulin、Jana Sopkova de-Oliveira Santos、Philippe Millet、Yves Charnay、Sylvain Rault、Thomas Cailly、Frederic Fabis
DOI:10.1021/jm300943r
日期:2012.11.26
The work described herein aims at finding new potential ligands for the brain imaging of 5-HT4 receptors (5-HT4Rs) using single-photon emission computed tomography (SPECT). Starting from the nonsubstituted phenanthridine compound 4a, exhibiting a Ki value of 51 nM on the 5-HT4R, we explored the structure–affinity in this series. We found that substitution in position 4 of the tricycle with a fluorine
本文描述的工作旨在寻找新的潜在配体,用于使用单光子发射计算机断层扫描 (SPECT)对 5-HT 4受体 (5-HT 4 Rs) 进行脑成像。从未取代的菲啶化合物4a 开始,在 5-HT 4 R上表现出51 nM的K i值,我们探索了该系列中的结构-亲和力。我们发现用氟原子取代三环的 4 位得到了最好的结果。在三环骨架内引入额外的氮原子导致对 5-HT 4 R的亲和力和选择性增加,表明拮抗剂4v的设计,表现出 0.04 nM 的高亲和力。然后合成了几种碘化类似物作为潜在的 SPECT 示踪剂。碘化化合物11d能够取代参考放射性碘化 5-HT 4 R 拮抗剂(1-丁基哌啶-4-基)甲基-8-氨基-7-碘[ 123 I]-2,3-二氢苯并[ b ][1 ,4]dioxine-5-carboxylate [ 123 I] 1 , [ 123 I]SB 207710} 体外和脑内。化合物11d用