Discovery of novel pyridazinylthioacetamides as potent HIV-1 NNRTIs using a structure-based bioisosterism approach
作者:Yu’ning Song、Peng Zhan、Dongwei Kang、Xiao Li、Ye Tian、Zhenyu Li、Xuwang Chen、Wenmin Chen、Christophe Pannecouque、Erik De Clercq、Xinyong Liu
DOI:10.1039/c3md00028a
日期:——
In continuation of our endeavors to develop new, potent, selective, and less toxic anti-HIV agents, we describe our structure-based bioisosterism design, synthetic strategy, and structure–activity relationship (SAR) studies that led to the identification of pyridazinylthioacetamides, a novel class of NNRTIs, isosteres of arylazolylthioacetanilide derivatives. Nearly all of the tested compounds inhibited HIV-1 strain IIIB replication in the lower micromolar concentration range (EC50: 0.046–5.46 μM). Notably, the most promising compound 8k exhibited extremely potent inhibitory activity against HIV-1 replication with an EC50 value of 0.046 μM, CC50 of 99.9 μM and the viral selectivity index amounted to 2149. These values were much better than those of NVP (EC50 = 0.09 μM) and DDC (EC50 = 1.04 μM). Compound 8k also exhibited moderate inhibition of enzymatic activity with an IC50 value of 4.06 μM, which was of the same order of magnitude as that of NVP (2.74 μM). Docking calculations were also performed to investigate the binding mode of compound 8k into the non-nucleoside binding site of HIV-1 RT and to rationalize some SARs.
为了继续开发新型、强效、选择性和低毒的抗艾滋病毒药物,我们介绍了基于结构的生物异构设计、合成策略和结构-活性关系(SAR)研究,通过这些研究,我们发现了哒嗪基硫代乙酰胺类化合物,这是一类新型的 NNRTIs,是芳唑基硫代乙酰苯胺衍生物的异构体。几乎所有测试化合物都能在较低的微摩尔浓度范围内抑制 HIV-1 株 IIIB 的复制(EC50:0.046-5.46 μM)。值得注意的是,最有前途的化合物 8k 对 HIV-1 复制具有极强的抑制活性,其 EC50 值为 0.046 μM,CC50 为 99.9 μM,病毒选择性指数为 2149。这些数值远远优于 NVP(EC50 = 0.09 μM)和 DDC(EC50 = 1.04 μM)。化合物 8k 对酶活性也表现出中等程度的抑制作用,其 IC50 值为 4.06 μM,与 NVP(2.74 μM)处于同一数量级。为了研究化合物 8k 与 HIV-1 RT 非核苷结合位点的结合模式,并使一些 SARs 更加合理,还进行了对接计算。