Synthesis and evaluation of imidazo[1,5-a][1,4]benzodiazepine esters with high affinities and selectivities at "diazepam-insensitive" benzodiazepine receptors
作者:Zi Qiang Gu、Garry Wong、Celia Dominguez、Brian R. de Costa、Kenner C. Rice、Phil Skolnick
DOI:10.1021/jm00060a007
日期:1993.4
A series of imidazo[1,5-a][1,4]benzodiazepine esters have been synthesized with varying ester side chains and 8-position substituents. The affinities of these compounds were evaluated at both "diazepam-insensitive" (DI) and diazepam-sensitive (DS) subtypes of the benzodiazepine receptor (BZR). A profound steric effect of the 3-position ester side chain moiety was observed on ligand affinity at DI.
已经合成了具有不同酯侧链和8位取代基的一系列咪唑并[1,5-a] [1,4]苯并二氮杂酸酯。在苯二氮卓受体(BZR)的“对地西ze不敏感”(DI)和对地西epa敏感(DS)的亚型下评估了这些化合物的亲和力。观察到3-位酯侧链部分对DI处的配体亲和力具有深远的空间效应。相反,酯的大小对DS上的配体亲和力影响较小。在一系列的8-氯酯中,叔丁基酯化合物8对DI表现出最高的亲和力(Ki = 1.7 nM)。此外,在所检查的一系列叔丁酯中,在8位上的卤素导致配体亲和力和DI选择性的提高。8-硝基衍生物23和8-异硫氰酸根同源物25对DI和DS均具有高亲和力,但几乎没有亚型选择性(DI分别为10.8和2.7 nM,DS分别为14和3.7 nM)。8-叠氮基叔丁酯29显示出比相应的乙酯,原型DI配体1(Ro 15-4513)明显更高的亲和力(Ki = 0.43 nM)和选择性(DI / DS比为0.2)