Acylguanidines as Bioisosteres of Guanidines: <i>N</i><sup>G</sup>-Acylated Imidazolylpropylguanidines, a New Class of Histamine H<sub>2</sub> Receptor Agonists
作者:Prasanta Ghorai、Anja Kraus、Max Keller、Carsten Götte、Patrick Igel、Erich Schneider、David Schnell、Günther Bernhardt、Stefan Dove、Manfred Zabel、Sigurd Elz、Roland Seifert、Armin Buschauer
DOI:10.1021/jm800841w
日期:2008.11.27
demonstrated by HPLC-MS, the acylguanidines (bioisosteres of the alkylguanidines) were absorbed from the gut of mice and detected in brain. In GTPase assays using recombinant receptors, acylguanidines were more potent at the guinea pig than at the human H2R. At the hH1R and hH3R, the compounds were weak to moderate antagonists or partial agonists. Moreover, potent partial hH4R agonists were identified. Receptor
N1-芳基(杂芳基)烷基-N2- [3-(1H-咪唑-4-基)丙基]胍是有效的组胺H2受体(H2R)激动剂,但由于缺乏口服生物利用度和CNS渗透性而削弱了它们的适用性。为了改善药代动力学,我们在胍基部分附近引入了羰基而不是亚甲基,从而将新型H2R激动剂的碱性降低了4-5个数量级。一些具有一个苯环的酰基胍比其二芳基类似物甚至更有效。如通过HPLC-MS证明的,酰基胍(烷基胍的生物等排体)从小鼠的肠中吸收并在脑中检测到。在使用重组受体的GTPase检测中,豚鼠的酰基胍比人的H2R更有力。在hH1R和hH3R处,这些化合物对中度拮抗剂或部分激动剂均弱。而且,确定了有效的部分hH4R激动剂。受体亚型的选择性取决于咪唑基丙基胍基团(特权结构),为包括强效H4R激动剂在内的独特药理学手段开辟了道路。