8-(1<i>H</i>-Imidazol-1-yl)-7-nitro-4(5<i>H</i>)-imidazo[1,2-<i>a</i>]quinoxalinone and Related Compounds: Synthesis and Structure−Activity Relationships for the AMPA-type Non-NMDA Receptor
作者:Junya Ohmori、Masao Shimizu-Sasamata、Masamichi Okada、Shuichi Sakamoto
DOI:10.1021/jm960664c
日期:1997.6.1
7-(1H-imidazol-1-yl)-8-nitro-4(5H)-[1,2,4]triazolo[4,3-alpha]quinoxalino ne (18) showed no or weak affinity for the receptors. Hence, we deduced that the nitrogen atom of the fused heterocycles at the 3-position of 5a and 14a plays an essential role as hydrogen bond acceptors in binding to AMPA receptors, whereas their amides act as proton donors. From the SAR on 1-alkyl derivatives of 5a and 14a, it was indicated
作为发现EAA受体AMPA亚型新型拮抗剂的计划的一部分,我们设计并合成了一系列由6-(1H)引发的杂环稠合的咪唑基喹喔啉酮5a-c,9、11、14a-e和18 -咪唑-1-基)-7-硝基-2,3(1H,4H)-喹喔啉二酮盐酸盐(1a.HCl,YM90K),方法是用咪唑和三唑环取代酰胺。通过抑制大鼠全脑的[3H] AMPA结合来评估其活性。结果显示出8-(1H-咪唑-1-基)-7-硝基-4(5H)-咪唑并[1,2-α]喹喔啉酮(5a)及其[1,2,4]三唑[4,3-α]类似物14a对AMPA受体具有高亲和力,Ki值分别为0.057和0.19 microM,类似于1a和NBQX(2)的活性(1a,Ki = 0.084 microM; 2,Ki = 0.060 microM)。相反,8-(1H-咪唑-1-基)-7-硝基-4(5H)-咪唑[1,5-α-喹喔啉酮(5b)和7-(1H-咪唑-1-基)-8-硝基-4(5H)-[1