Abstract

The quinazoline-2,4-diones scaffold is found in bioactive compounds, commercial drugs and exhibit important biological activities. However, their antidiabetic activity is rarely explored. For this purpose, an easy one-pot three-components and straightforward synthesis of 3-substituted quinazoline-2,4-diones was designed, in both, the catalyst- and solvent-free conditions under microwave irradiation. Additionally, the synthesized compounds were screened for in vitro α-amylase and α-glucosidase inhibitory activity, as well as antioxidants and cytotoxicity. The quinazoline-2,4-diones were isolated, with yields in the range of 30-65%. The compounds 3d, 3e, 3g and 3h displayed moderate activity against α-amylase and/or α-glucosidase enzymes compared with the acarbose drug. The molecular docking study revealed that all active compounds displayed a different type of intermolecular interaction in the pocked site of these enzymes. Interestingly, in the Artemia salina assay, the compound 3d exhibited a higher cytotoxic effect than 5-fluorouracil. All these results support the pharmacological potential of quinazoline-2,4-diones since all evaluated compounds behave as moderate inhibitors of the enzymes α-amylase and/or α-glucosidase.

Graphic abstract

An easy one-pot three-components and straightforward synthesis of 3-substituted quinazoline-2,4-diones was designed, in both, the catalyst- and solvent-free conditions under microwave irradiation. Moreover, the in vitro α-amylase and α-glucosidase inhibitory activity, as well as antioxidants and cytotoxicity are reported.

中文翻译：

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3-取代的喹唑啉-2,4（1 H，3 H）-二酮的合成，生物学评价和分子对接

摘要

喹唑啉-2,4-二酮骨架存在于生物活性化合物，商业药物中，并具有重要的生物活性。然而，它们的抗糖尿病活性很少被探索。为了这个目的，设计了一种简单的一锅三组分和3-取代的喹唑啉-2,4-二酮的直接合成方法，该方法在无催化剂和无溶剂条件下均在微波辐射下进行。另外，筛选合成的化合物的体外α-淀粉酶和α-葡萄糖苷酶抑制活性，以及​​抗氧化剂和细胞毒性。分离出喹唑啉-2，4-二酮，产率为30-65％。化合物3d，3e，3g和3h与阿卡波糖药物相比，对α-淀粉酶和/或α-葡萄糖苷酶的活性中等。分子对接研究表明，所有活性化合物在这些酶的缩合位点均表现出不同类型的分子间相互作用。有趣的是，在卤虫盐析试验中，化合物3d的细胞毒性作用比5-氟尿嘧啶高。所有这些结果支持了喹唑啉-2,4-二酮的药理潜力，因为所有评估的化合物均表现为酶α-淀粉酶和/或α-葡萄糖苷酶的中度抑制剂。

图形摘要

在微波和无溶剂条件下，设计了一种简单的一锅三组分法和3-取代的喹唑啉-2,4-二酮的简单合成方法。此外，还报道了体外α-淀粉酶和α-葡萄糖苷酶的抑制活性，以及​​抗氧化剂和细胞毒性。