Synthesis and Biological Evaluation of a New Reversely Linked Type of Dual Histamine H2 and Gastrin Receptor Antagonist.
作者:Yasuyuki KAWANISHI、Shoichi ISHIHARA、Kimio TAKAHASHI、Tadahiko TSUSHIMA、Sanji HAGISHITA、Michio ISHIKAWA、Yasunobu ISHIHARA
DOI:10.1248/cpb.45.116
日期:——
In an attempt to improve the low oral absorbability of previously reported dual histamine H2 and gastrin receptor antagonists, compounds of a different type were synthesized and evaluated for biological activity. These new compounds bear a histamine H2 receptor antagonist (H2A) pharmacophore moiety attached to a gastrin receptor antagonist (GA) pharmacophore moiety in a reversed manner, namely the head-to-head manner, different from the previously reported head-to-tail manner. These new hybrid compounds were classified into three types : type I, the regular amide type bearing a roxatidine moiety; type II, the reversed amide type bearing a roxatidine moiety; and type III, hybrid compounds bearing a famotidine moiety directly connected to a GA moiety without a spacer. Among them, only (R)-1-[3-(N'-4-[2-(N-aminosulfonylamidino)ethylthiomethyl]thiazol-2-yl}guanidinomethyl)phenyl]-3-(1-methyl-2-oxo-5-phenyl-2, 3-dihydro-1H-1, 4-benzodiazepin-3-yl)urea (42), belonging to type III, showed a weak but distinct histamine H2 receptor-antagonistic activity as well as a modest gastrin receptor-antagonistic activity. Of most importance was the finding that this compound showed a weak but clearly improved in vivo oral antigastric acid secretory activity as a result of the structural changes, including the decreased molecular weight.
为了提高先前报道的双重组胺H2和胃泌素受体拮抗剂的低口服吸收性,合成并评估了一类不同类型的化合物的生物活性。这些新的化合物以一种反转的方式,即头对头的方式,连接一个组胺H2受体拮抗剂(H2A)药效团部分和一个胃泌素受体拮抗剂(GA)药效团部分,这与先前报道的头对尾方式不同。这些新的杂化化合物分为三种类型:I型,常规酰胺型具有roxatidine部分;II型,反转酰胺型具有roxatidine部分;III型,直接连接famotidine部分和GA部分,不含间隔基的杂化化合物。其中,只有(R)-1-[3-(N'-4-[2-(N-氨基磺酰基氨基)乙硫甲基]噻唑-2-基}胍甲基)苯基]-3-(1-甲基-2-氧-5-苯基-2,3-二氢-1H-1,4-苯并二氮杂卓-3-基)脲(42),属于III型,显示出微弱的但明显的组胺H2受体拮抗活性以及适度的胃泌素受体拮抗活性。最重要的是,发现这种化合物由于结构变化,包括分子量的降低,显示出了微弱但明显改善的体内口服抗胃酸分泌活性。