作者:Philip T. Cherian、Martin N. Cheramie、Ravi K.R. Marreddy、Dinesh M. Fernando、Julian G. Hurdle、Richard E. Lee
DOI:10.1016/j.bmcl.2018.07.018
日期:2018.10
their utility. As such, we explored the extent to which the tetramic acid motif, frequently found in naturally occurring antibiotics, can be used to generate novel β-lactam antibiotics with improved antibacterial activity. We synthesized new ampicillin – tetramic acid, cephalosporin – tetramic acid, and cephamycin – tetramic acid analogs and evaluated their activities against problematic Gram-positive
β-内酰胺是最重要的一类抗生素,其耐药性的出现威胁到它们的实用性。因此,我们探索了在自然存在的抗生素中经常发现的四酸基序可用于产生具有增强抗菌活性的新型β-内酰胺类抗生素的程度。我们合成了新的氨苄青霉素–氨基乙酸,头孢菌素–氨基乙酸和头霉素–氨基乙酸类似物,并评估了它们对有问题的革兰氏阳性和革兰氏阴性病原体的活性。在类似物中,7-氨基头孢菌酸类似物3397和7-氨基-3-乙烯基头孢菌酸3436显示出对金黄色葡萄球菌的有效活性。NRS 70(MRSA)的MIC分别为6.25μg/ mL和3.13μg/ mL。这些新的类似物比头孢克洛和头孢氨苄的效力强16倍以上。此外,Δ 2头霉素-特特拉姆酸类似物3474含有在特特拉姆酸核的5位上的基本胍取代基显示有效的活性针对的若干临床菌株肺炎克雷伯和大肠杆菌。