Novel biaryloxazolidinone derivatives containing a rhodanine or thiohydantoin moiety were designed, synthesized and evaluated for their antibacterial activity. The key compounds 7 and 9 were synthesized by the knoevenagel condensation of intermediate aldehyde 5 with rhodanine derivatives 6a-6b. The preliminary study showed that compounds 7, 9 and 10e exhibited potent antibacterial activity with MIC values of 0.125 µg/mL against S. aureus, MRSA, MSSA, LREF and VRE pathogens, using linezolid and radezolid as the positive controls. The most promising compound 10e exhibited potent antibacterial activity against tested clinical isolates of MRSA, MSSA, VRE and LREF with MIC values in the range of 0.125-0.5 µg/mL, and the potency of 10e against clinical isolates of LREF was 64-fold higher than that of linezolid. Moreover, compound 10e was non-cytotoxic with an IC50 value of 91.04 μM against HepG2 cell. Together, compound 10e might serve as a novel antibacterial agent for further investigation.

中文翻译：

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设计和合成含有罗丹宁或硫代乙内酰脲部分作为对革兰氏阳性细菌的新型抗菌剂的联芳恶唑烷酮衍生物。

设计，合成并评估了含有若丹宁或硫代乙内酰脲部分的新型联芳恶唑烷酮衍生物。关键化合物7和9是通过中间体醛5与若丹宁衍生物6a-6b的knoevenagel缩合反应合成的。初步研究表明，使用利奈唑胺和雷地唑烷作为阳性对照，化合物7、9和10e表现出对金黄色葡萄球菌，MRSA，MSSA，LREF和VRE病原体的有效抗菌活性，MIC值为0.125 µg / mL。最有前途的化合物10e对MRSA，MSSA，VRE和LREF的临床分离株表现出有效的抗菌活性，MIC值在0.125-0.5 µg / mL范围内，而10e对LREF的临床分离株的效力则高64倍比利奈唑胺。而且，化合物10e对HepG2细胞无细胞毒性，IC50值为91.04μM。化合物10e一起可作为新型抗菌剂用于进一步研究。