Enhancing the anti-biofilm activity of 5-aryl-2-aminoimidazoles through nature inspired dimerisation
摘要:
The increased tolerance of biofilms against disinfectants and antibiotics has stimulated research into new methods of biofilm prevention and eradication. In our previous work, we have identified the 5-aryl-2-aminoimidazole core as a scaffold that demonstrates preventive activity against biofilm formation of a broad range of bacterial and fungal species. Inspired by the dimeric nature of natural 2-aminoimidazoles of the oroidin family, we investigated the potential of dimers of our decorated 5-aryl-2-aminoimidazoles as biofilm inhibitors. A synthetic approach towards 2-aminoimidazole dimers linked by an alkyl chain was developed and a total of 48 dimers were synthesized. The linkers were introduced at two different positions, the N1-position or the N2-position, and the linker length and the substitution of the 5-phenyl ring (H, F, Cl, Br) were varied. Although, no clear correlation between linker length and biofilm inhibition was observed, a strong increase in anti-biofilm activity for almost all N1, N1'-linked dimers was obtained, compared to the respective monomers against Salmonella Typhimurium, Escherichia coli and Staphylococcus aureus. The N2, N2'-linked dimers, having a H-or F-substitution, were also found to show a strong increase in anti-biofilm activity compared to the respective monomers against these three bacterial species and against Pseudomonas aeruginosa. In addition, the obtained growth measurements suggest a broad concentration range with specific biofilm inhibition and no effect on the planktonic growth against Salmonella Typhimurium and Pseudomonas aeruginosa. (C) 2018 Published by Elsevier Ltd.
Ag(i) complexes with alkylidene-bis(2-aminopyrimidines) as building units for discrete metallomacrocyclic frames. A structural and solution study
摘要:
烯叉双(2-氨基嘧啶)(pyr2Cx, x = 2–5)是有用的配体,能与Ag(I)生成离散的金属环。分离得到了[(pyr2C2)Ag(NO3)]2和[(H-pyr2C4)Ag(NO3)2]2的晶体结构,其中每个大环部分都通过弱相互作用与其周围环境相互作用,形成三维离散结构。另一方面,溶液研究显示,Ag(pyr2Cx)+配合物的形成平衡常数高于已知文献中单嘧啶Ag(I)配合物的值,尽管这种差异可以通过考虑Ag(I)-pyr2Cx配合物的固态结构来解释。
A Combined Experimental and Theoretical Study of Anion–π Interactions in Bis(pyrimidine) Salts
作者:Angel Garcia-Raso、Francisca M. Albertí、Juan J. Fiol、Andrés Tasada、Miquel Barceló-Oliver、Elies Molins、Daniel Escudero、Antonio Frontera、David Quiñonero、Pere M. Deyà
DOI:10.1002/ejoc.200700809
日期:2007.12
dinium) tetrafluoroborate salt that exhibits anion–πinteractions that are responsible for the crystal packing. The anion forms a sandwich complex with two pyrimidine rings. When the anion is nitrate, the crystal packing is governed by anion–πinteractions and hydrogen bonds, and the sandwich complex is not formed. Finally, a theoretical study of the anion–πinteractions in charged pyrimidine rings