Design, synthesis, and greener pasture biological assessment of a novel nucleoside: 1-(α-D-ribofuranosyl)-6,7-difluoro-2-methyl-4-quinazolinone as an inhibitor of COVID-19 and Alzheimer's disease
作者:LAILA M. BREAK、ADIL A. GOBOURI、WAFA S. AL-HARTHI、MOHAMED HAGAR、NADIA S. ALKAFF、MUSA A. SAID
DOI:10.55730/1300-0527.3483
日期:——
Synthesis of a new fluorinated nucleoside of 6,7-difluoro-2-methyl-4-quinazolinone was described. 2-Amino-4,5-difluorobenzoic acid 1 reacts with (CH3CO)2O followed by ammonia to form (1H)-6,7-difluoro-2-methyl-4-quinazolinone 3a. Ribosylation of a silylated 4 with l-O-acety1-2,3-5-tri-O-benzoyl-α-D-ribofuranose 5 forms a protected nucleoside 6 then unprotected from 6 to give a free nucleoside 7. Greener pasture biological docking of the cystine protease of COVID-19 [Mpro, code 7BQY, PDB] by novel nucleoside and fluoroquinazoline compounds is presented. LIGPLOT (2D) representations calculated for the same ligands are shown. A superposition of remdesivir approved medicine, N3 inhibitor, and our ligands docked together into the binding protein of 7BQY is also given for a fair comparison. The binding affinities of remdesivir, N3 inhibitor, the nucleoside 7, and fluoroquinazoline 3a, 3b compounds with 7BQY calculated under the same conditions are -7.7, -7.4, -7.6, -6.1, and -6.1 kcal mol-1, respectively. The high values were due to the existence of many hydrophobic interactions and hydrogen bonds between the ligands and the active amino acid residues of the receptor, indicating a promising candidate as a COVID-19 inhibitor. Pro Tox -II server showed that compound 7 has a similar feature to the approved antiviral drug remdesivir for COVID-19. Additionally, a fascinating molecular modeling investigation showed that our nucleoside demonstrated good binding inhibition of AChE enzyme towards advancing an efficient medication against Alzheimer's disease. Finally, DFT has been conducted to illustrate the MD results in terms of the molecular descriptor-based structural activity relationship calculated from FMOs.
本研究描述了一种新的氟化核苷-6,7-二氟-2-甲基-4-喹唑啉酮的合成。2-氨基-4,5-二氟苯甲酸 1 与 (CH3CO)2O 反应,然后与氨反应,生成 (1H)-6,7-二氟-2-甲基-4-喹唑啉酮 3a。硅烷基化的 4 与 l-O-乙酰基 1-2,3-5-三-O-苯甲酰基-α-D-呋喃核糖 5 发生核糖基化反应,形成受保护的核苷 6,然后从 6 中解除保护,得到游离核苷 7。介绍了新型核苷和氟喹唑啉化合物与 COVID-19 的胱氨酸蛋白酶[Mpro,代码 7BQY,PDB]的绿色牧场生物对接。图中显示了为相同配体计算的 LIGPLOT (2D) 表示。为了进行公平比较,还给出了雷米地韦已获批准的药物、N3 抑制剂和我们的配体与 7BQY 结合蛋白对接后的叠加图。在相同条件下计算得出的雷米替韦、N3 抑制剂、核苷 7 和氟喹唑啉 3a 和 3b 与 7BQY 的结合亲和力分别为-7.7、-7.4、-7.6、-6.1 和 -6.1 kcal mol-1。这些高值是由于配体与受体的活性氨基酸残基之间存在许多疏水相互作用和氢键,这表明 COVID-19 有希望成为一种候选抑制剂。Pro Tox -II 服务器显示,化合物 7 与已获批准的 COVID-19 抗病毒药物雷米替韦具有相似的特征。此外,一项引人入胜的分子建模研究表明,我们的核苷对 AChE 酶具有良好的结合抑制作用,有望成为治疗阿尔茨海默病的有效药物。最后,我们进行了 DFT 计算,以说明从 FMOs 计算出的基于分子描述符的结构活性关系的 MD 结果。