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首页> 外文期刊>Journal of Medicinal Chemistry >A novel class of orally active non-peptide bradykinin B2 receptor antagonists. 4. Discovery of novel frameworks mimicking the active conformation.
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A novel class of orally active non-peptide bradykinin B2 receptor antagonists. 4. Discovery of novel frameworks mimicking the active conformation.

机译：一类新型的口服活性非肽缓激肽B2受体拮抗剂。 4.发现模仿主动构象的新颖框架。

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In recent articles we reported the identification of a series of 8-[[2, 6-dichloro-3-[N-methyl-N-[(E)-(substituted)acryloylglycyl]amino]++ +benzy l]oxy]-2-methylimidazo[1,2-a]pyridines as the first orally active non-peptide bradykinin (BK) B2 receptor antagonists. Optimization of the terminal glycine part and the imidazo[1,2-a]pyridine moiety led to the discovery of a clinical candidate (5, FR173657). With the aim of completion of the structure-activity relationship (SAR) study, we next investigated the roles of the substituents on the central phenyl ring. The results suggested that the 2,6-dichloro or 2, 6-dimethyl groups may play important roles in regulating the conformations of the 1- and 3-substituents and also may interact with hydrophobic pockets of the B2 receptors. Furthermore, according to the results of a molecular modeling study reported in part 1 of this series, we designed and synthesized a series of sterically constrained analogues by replacing the N-methylamide group with cis-amide-like rigid moieties. We discovered several bioisosteres and chemically proved that the N-methylamide moiety adopts the cis-amide form in the active conformation. Extensive chemical modification led to the identification of a novel class of highly potent and orally active non-peptide B2 antagonists represented by a pyrrole derivative (52a, FR193517). Compound 52a inhibited the specific binding of [3H]BK to recombinant human B2 receptors expressed in Chinese hamster ovary (CHO) cells and guinea pig ileum membrane preparations expressing B2 receptors with IC50s of 0.37 and 0.56 nM, respectively. This compound also displayed excellent in vivo functional antagonistic activity against BK-induced bronchoconstriction in guinea pigs at 1 mg/kg by oral administration.
机译：在最近的文章中，我们报道了一系列8-[[2,6-二氯-3- [N-甲基-N-[（E）-（取代）丙烯酰甘氨酰]氨基] ++ +苄基]氧基]的鉴定。 -2-甲基咪唑并[1,2-a]吡啶类作为第一种口服活性非肽缓激肽（BK）B2受体拮抗剂。末端甘氨酸部分和咪唑并[1,2-a]吡啶部分的优化导致了临床候选药物的发现（5，FR173657）。为了完成结构-活性关系（SAR）研究，我们接下来研究了中心苯环上取代基的作用。结果表明2，6-二氯或2，6-二甲基基团可能在调节1-和3-取代基的构象中起重要作用，并且还可能与B2受体的疏水口袋相互作用。此外，根据本系列第1部分中报道的分子建模研究的结果，我们设计和合成了一系列空间受限的类似物，方法是将N-甲基酰胺基团替换为顺式酰胺样刚性部分。我们发现了几种生物等排体，并化学证明了N-甲基酰胺部分在活性构象中采用顺式酰胺形式。广泛的化学修饰导致鉴定了以吡咯衍生物为代表的一类新型的高效和口服活性非肽B2拮抗剂（52a，FR193517）。化合物52a抑制[3H] BK与在中国仓鼠卵巢（CHO）细胞和表达B2受体的豚鼠回肠膜制剂中表达的重组人B2受体的特异性结合，IC50分别为0.37和0.56 nM。通过口服给药，该化合物还对豚鼠中的BK诱导的支气管收缩表现出优异的体内功能拮抗活性。

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