2-((3,5-Dinitrobenzyl)thio)quinazolinones: Potent Antimycobacterial Agents Activated by Deazaflavin (F420)-Dependent Nitroreductase (Ddn),Journal of Medicinal Chemistry

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2-((3,5-Dinitrobenzyl)thio)quinazolinones: Potent Antimycobacterial Agents Activated by Deazaflavin (F420)-Dependent Nitroreductase (Ddn)
Journal of Medicinal Chemistry ( IF 6.8 ) Pub Date : 2020-12-21 , DOI: 10.1021/acs.jmedchem.0c01374
Yanlin Jian ₁ , He Eun Forbes ₂ , Fabian Hulpia ₁ , Martijn D P Risseeuw ₁ , Guy Caljon ₃ , Hélène Munier-Lehmann ₄ , Helena I M Boshoff ₂ , Serge Van Calenbergh ₁

Affiliation

Swapping the substituents in positions 2 and 4 of the previously synthesized but yet undisclosed 5-cyano-4-(methylthio)-2-arylpyrimidin-6-ones 4, ring closure, and further optimization led to the identification of the potent antitubercular 2-thio-substituted quinazolinone 26. Structure–activity relationship (SAR) studies indicated a crucial role for both meta-nitro substituents for antitubercular activity, while the introduction of polar substituents on the quinazolinone core allowed reduction of bovine serum albumin (BSA) binding (63c, 63d). While most of the tested quinazolinones exhibited no cytotoxicity against MRC-5, the most potent compound 26 was found to be mutagenic via the Ames test. This analogue exhibited moderate inhibitory potency against Mycobacterium tuberculosis thymidylate kinase, the target of the 3-cyanopyridones that lies at the basis of the current analogues, indicating that the whole-cell antimycobacterial activity of the present S-substituted thioquinazolinones is likely due to modulation of alternative or additional targets. Diminished antimycobacterial activity was observed against mutants affected in cofactor F₄₂₀ biosynthesis (fbiC), cofactor reduction (fgd), or deazaflavin-dependent nitroreductase activity (rv3547), indicating that reductive activation of the 3,5-dinitrobenzyl analogues is key to antimycobacterial activity.

中文翻译：

2-((3,5-二硝基苯甲基)硫代)喹唑啉酮：由脱氮黄素 (F420) 依赖性硝基还原酶 (Ddn) 激活的有效抗分枝杆菌药物

交换先前合成但尚未公开的 5-cyano-4-(methylthio)-2-arylpyrimidin-6-ones 4 的 2 和4位取代基、闭环和进一步优化导致鉴定出有效的抗结核药物 2-硫代喹唑啉酮26。结构-活性关系（SAR）研究表明，两个间硝基取代基在抗结核活性中发挥着至关重要的作用，而在喹唑啉酮核心上引入极性取代基可以减少牛血清白蛋白（BSA）的结合（ 63c，63d）。虽然大多数测试的喹唑啉酮类化合物没有表现出针对 MRC-5 的细胞毒性，但通过 Ames 测试发现最有效的化合物26具有诱变性。该类似物对结核分枝杆菌胸苷酸激酶（3-氰基吡啶酮的靶标，位于当前类似物的基础上）表现出中等的抑制效力，表明本发明的S-取代的硫代喹唑啉酮的全细胞抗分枝杆菌活性可能是由于调节替代或额外目标。观察到受辅因子 F ₄₂₀生物合成 ( fbiC )、辅因子还原 ( fgd ) 或去氮黄素依赖性硝基还原酶活性 ( rv3547 ) 影响的突变体的抗分枝杆菌活性降低，表明 3,5-二硝基苄基类似物的还原激活是抗分枝杆菌活性的关键。

更新日期：2021-01-14

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