Thiophene bioisosteres of GluN2B selective NMDA receptor antagonists: Synthesis and pharmacological evaluation of [7]annuleno[b]thiophen-6-amines
作者:Sören Baumeister、Dirk Schepmann、Bernhard Wünsch
DOI:10.1016/j.bmc.2019.115245
日期:2020.1
Br-atom or a hydroxymethyl moiety in 2-position were less tolerated by the GluN2B receptor. Very similar relationships between the structure and GluN2B affinity and structure and σ affinity, in particular σ2 affinity, were detected. A slight preference for the ifenprodil binding site of GluN2B receptors over σ1 and σ2 receptors was found for methylamines 11c (≈2-fold) and 11d (≈1.5-2-fold) as well as for
制备了强效的GluN2B受体阴性变构调节剂的噻吩生物同工异构体,并进行了药理学评估。在第一步反应中,通过噻吩-3-羧酸(8)的羧化反应,大大改善了4,5,7,8-四氢[7]环核[b]噻吩-6-(10)的五步合成。还原胺化和烷基化产生了三个同源系列的仲和叔苯基烷基胺5、11和12。金属化,与1-甲酰基哌啶反应并随后还原得到了羟甲基衍生物15和16,它们被设计为苯酚的生物等排体。通过用NBS溴化酮10并随后进行还原性胺化反应,获得了2-溴衍生物18。使用带有3-苯基丙基氨基或4-苯基丁基氨基部分的[7]环戊[b]噻吩实现了高GluN2B亲和力(例如5c:Ki = 5.9 nM;11d:Ki = 9.0nM)。叔乙胺12显示出比叔甲胺11或仲胺5低的GluN2B亲和力(例如5c:Ki = 5.9 nM; 11c:Ki = 6.0; 12c:Ki = 51 nM)。GluN2B受体对2位的Br原子