Conformational requirements for histamine H2-receptor inhibitors: a structure-activity study of phenylene analogs related to cimetidine and tiotidine
作者:Jacob M. Hoffman、Adolph M. Pietruszkiewicz、Charles N. Habecker、Brian T. Phillips、William A. Bolhofer、Edward J. Cragoe、Mary Lou Torchiana、William C. Lumma、John J. Baldwin
DOI:10.1021/jm00356a005
日期:1983.2
the guinea pig atrium and inhibition of histamine stimulated secretion of gastric acid in the dog. In both series, biological activity is markedly dependent on the m-phenylene regioisomers. Histamine H2-receptor activity is retained in both series; however, in the tiotidine series, gastric antisecretory activity is significantly improved. Regardless of the end group, N-cyanoguanidine 1,1-diamino-2-nitroethene
作为研究的一部分,合成了两个与西咪替丁和替替丁有关的化合物,以评估构象参数在与组胺H2受体结合中的重要性。柔性的甲硫基乙基连接链被构象限制的亚苯基单元代替。评价了这些化合物对豚鼠心房中双马布里刺激的变时反应的拮抗作用以及对狗中组胺刺激的胃酸分泌的抑制作用。在这两个系列中,生物活性明显取决于间亚苯基区域异构体。组胺H2-受体的活性在两个系列中均保持不变;然而,在噻替丁系列中,胃的抗分泌活性显着提高。不论端基如何,N-氰基胍1,1-二氨基-2-硝基乙烯或3,4-二氨基-1,2,5-噻二唑1-氧化物 每个3 3-(2-胍基-4-噻唑基)苯基类似物是约。静脉内效力分别是替替丁和西咪替丁的8倍和90倍。还评估了亚苯基单元对生物活性的电子影响。结论是,在组胺H 2受体的结合事件中,间苯撑连接元件施加的几何约束比电子因子更重要。