AbstractThe combination of antibacterial and antiviral agents is becoming a very important aspect of dealing with resistant bacterial and viral infections. The N‐phenylthiazole scaffold was found to possess significant anti‐MRSA, antifungal, and anti‐COVID‐19 activities as previously published; hence, a slight refinement was proposed to attach various alkyne lipophilic tails to this promising scaffold, to investigate their effects on the antimicrobial activity of the newly synthesized compounds and to provide a valuable structure–activity relationship. Phenylthiazole 4 m exhibited the most potent anti‐MRSA activity with 8 μg/mL MIC value. Compounds 4 k and 4 m demonstrated potent activity against Clostridium difficile with MIC values of 2 μg/mL and moderate activity against Candida albicans with MIC value of 4 μg/mL. When analyzed for their anti‐COVID‐19 inhibitory effect, compound 4 b emerged with IC50=1269 nM and the highest selectivity of 138.86 and this was supported by its binding score of −5.21 kcal mol−1 when docked against SARS‐CoV‐2 M pro. Two H‐bonds were formed, one with His164 and the other with Met49 stabilizing phenylthiazole derivative 4 b, inside the binding pocket. Additionally, it created two arene‐H bonds with Asn142 and Glu166, through the phenylthiazole scaffold and one arene‐H bond with Leu141 via the phenyl ring of the lipophilic tail.
摘要抗菌剂和抗病毒剂的结合正成为应对耐药性细菌和病毒感染的一个非常重要的方面。之前发表的研究发现,N-苯基噻唑支架具有显著的抗MRSA、抗真菌和抗COVID-19活性;因此,研究人员建议对这一前景广阔的支架进行细微改进,在其上附加各种亲脂性炔尾,研究它们对新合成化合物抗菌活性的影响,并提供有价值的结构-活性关系。苯噻唑 4 m 的 MIC 值为 8 μg/mL,具有最强的抗 MRSA 活性。化合物 4 k 和 4 m 对艰难梭菌具有强效活性,MIC 值为 2 μg/mL,对白色念珠菌具有中等活性,MIC 值为 4 μg/mL。在分析化合物 4 b 的抗 COVID-19 抑制作用时,发现其 IC50=1269 nM,选择性最高,为 138.86,与 SARS-CoV-2 M pro 对接时的结合得分为 -5.21 kcal mol-1。在结合口袋内形成了两个 H 键,一个是与 His164,另一个是与 Met49,从而稳定了苯基噻唑衍生物 4 b。此外,它还通过苯基噻唑支架与 Asn142 和 Glu166 形成了两个炔-H 键,并通过亲脂尾部的苯基环与 Leu141 形成了一个炔-H 键。