Synthesis and Structure−Affinity Relationships of New 4-(6-Iodo-<i>H</i>-imidazo[1,2-<i>a</i>]pyridin-2-yl)-<i>N</i>-dimethylbenzeneamine Derivatives as Ligands for Human β-Amyloid Plaques
作者:Lisheng Cai、Jessica Cuevas、Sebastian Temme、Mary M. Herman、Claudio Dagostin、David A. Widdowson、Robert B. Innis、Victor W. Pike
DOI:10.1021/jm0702231
日期:2007.9.1
extensive set of 4-(6-iodo-H-imidazo[1,2-a]pyridin-2-yl)-N-dimethylbenzeneamine (IMPY) derivatives was synthesized and assayed for affinity toward human Abeta plaques. 6-Ethylthio- (12h), 6-cyano- (12e), 6-nitro- (12f), and 6-p-methoxybenzylthio- (15d) analogues were discovered to have high affinity (KI < 10 nM). However, introduction of a hydrophilic thioether group in the 6-position (15a-c, 15e-g) reduced
合成了一组新的4-(6-碘-H-咪唑并[1,2-a]吡啶-2-基)-N-二甲基苯胺(IMPY)衍生物,并测定了对人Abeta斑块的亲和力。发现6-乙基硫基-(12h),6-氰基-(12e),6-硝基-(12f)和6-对甲氧基苄基硫基-(15d)类似物具有高亲和力(KI <10 nM)。然而,在6-位(15a-c,15e-g)中引入亲水性硫醚基降低或消除了亲和力。在仲N-甲基类似物中,相邻环位置的溴取代基(14a)具有高亲和力(KI = 7.4 nM),而甲基取代基则没有(14c)。对6位非亲水性硫醚取代基的耐受性开辟了开发新的敏感正电子发射断层显像放射配体的可能性,以对阿尔茨海默氏病中的人Abeta斑块进行成像,尤其是考虑到硫醚易于通过S-烷基化反应被碳11或氟18标记。在这项研究中揭示的结构活性关系扩展了对人类Abeta斑块中IMPY样配体结合位点的形貌的了解。