A series of amine-alkyl derivatives of 5-arylidenehydantoin 3-21 was evaluated for their ability to improve antibiotic effectiveness in two strains of Gram-negative Enterobacter aerogenes: the reference strain (ATCC-13048) and the chloramphenicol-resistant derivative over-producing the AcrAB-TolC efflux pump (CM-64). Three antibiotics, chloramphenicol, nalidixic acid and sparfloxacin were used as markers of efflux pump activity. New compounds (5-16) were obtained within 3-4 step synthesis using Knoevenagel condensation, Mitsunobu reaction and microwave aided N-alkylation. Molecular modeling based structure-activity relationship (SAR) studies were performed. The most active compounds: (Z)-5-(4-(diethylamino)benzylidene)-3-(2-hydroxy-3-(4-(2-hydroxyethyl)piperazin-1-yl)propyl)imidazolidine-2,4-dione (14) and (Z)-5-(2,4-dimethoxybenzylidene)-3-(2-hydroxy-3-(isopropylamino)propyl)imidazolidine-2,4-dione (15) induced fourfold decrease of minimal inhibition concentration (MIC) of all tested antibiotics in the strain CM-64 overexpressing the AcrAB-TolC pump.

译文

:在5种革兰氏阴性产气肠杆菌菌株中,评估了一系列5芳基乙内酰脲3-21的胺-烷基衍生物提高抗生素有效性的能力:参考菌株(ATCC-13048)和耐氯霉素的衍生物生产AcrAB-TolC外排泵(CM-64)。三种抗生素氯霉素,萘啶酸和司帕沙星被用作外排泵活动的标志物。使用Knoevenagel缩合,Mitsunobu反应和微波辅助的N-烷基化,可在3-4步合成过程中获得新化合物(5-16)。进行了基于分子建模的结构-活性关系(SAR)研究。最具活性的化合物:(Z)-5-(4-(二乙基氨基)亚苄基)-3-(2-羟基-3-(4-(2-羟基乙基)哌嗪-1-基)丙基)咪唑烷-2,4 -二酮(14)和(Z)-5-(2,4-二甲氧基亚苄基)-3-(2-羟基-3-(异丙基氨基)丙基)咪唑烷-2,4-二酮(15)引起最小抑制作用降低四倍AcrAB-TolC泵过表达的CM-64菌株中所有测试抗生素的浓度(MIC)。

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