Inhibition of dipeptidyl peptidase IV (DPP-4) is an exciting new approach for the treatment of diabetes. To date there has been no DPP-4 chemotype possessing a carboxy group that has progressed into clinical trials. Originating from the discovery of the structurally novel quinoline derivative 1, we designed novel pyridine derivatives containing a carboxy group. In our design, the carboxy group interacted with the targeted amino acid residues around the catalytic region and thereby increased the inhibitory activity. After further optimization, we identified a hydrate of [5-(aminomethyl)-6-(2,2-dimethylpropyl)-2-ethyl-4-(4-methylphenyl)pyridin-3-yl]acetic acid (30c) as a potent and selective DPP-4 inhibitor. The desired interactions with the critical active-site residues, such as a salt-bridge interaction with Arg125, were confirmed by X-ray cocrystal structure analysis. In addition, compound 30c showed a desired preclinical safety profile, and it was encoded as TAK-100.

中文翻译：

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发现3-吡啶基乙酸衍生物（TAK-100）作为有力，选择性和口服活性的二肽基肽酶IV（DPP-4）抑制剂

抑制二肽基肽酶IV（DPP-4）是治疗糖尿病的令人兴奋的新方法。迄今为止，尚无具有羧基的DPP-4化学型已进入临床试验。从发现结构新颖的喹啉衍生物1出发，我们设计了含有羧基的新型吡啶衍生物。在我们的设计中，羧基与催化区域周围的目标氨基酸残基相互作用，从而增加了抑制活性。经过进一步优化后，我们确定了[5-（氨基甲基）-6-（2,2-二甲基丙基）-2-乙基-4-（4-甲基苯基）吡啶-3-基]乙酸的水合物（30c）作为有效且选择性的DPP-4抑制剂。通过X射线共晶结构分析确认了与关键活性位点残基的所需相互作用，例如与Arg125的盐桥相互作用。此外，化合物30c表现出所需的临床前安全性，编码为TAK-100。