A series of novel pyrimidinedione derivatives were designed and evaluated for in vitro dipeptidyl peptidase-4 (DPP-4) inhibitory activity and in vivo anti-hyperglycemic efficacy. Among them, the representative compounds 11, 15 and 16 showed excellent inhibitory activity of DPP-4 with IC₅₀ values of 64.47 nM, 188.7 nM and 65.36 nM, respectively. Further studies revealed that compound 11 was potent in vivo hypoglycemic effect. The structure–activity relationships of these pyrimidinedione derivatives had been discussed, which would be useful for developing novel DPP-4 inhibitors as treating type 2 diabetes.

中文翻译：

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DPP-4抑制剂新型嘧啶二酮衍生物的设计，合成及生物学评价

设计并评估了一系列新型嘧啶二酮衍生物的体外二肽基肽酶-4（DPP-4）抑制活性和体内抗高血糖功效。其中，代表性的化合物11，15和16显示DPP-4的优异的抑制活性与IC _50个分别64.47 NM的值，188.7纳米和65.36纳米。进一步的研究表明，化合物11在体内具有有效的降血糖作用。已经讨论了这些嘧啶二酮衍生物的结构-活性关系，这将有助于开发新型DPP-4抑制剂来治疗2型糖尿病。