Novel bisindolyl-cycloalkane indoles resulted from the reaction of aliphaticdialdehydes and indole. As bisindolyl-natural alkaloid compounds have recently been reported as inhibitors of the methicillin-resistant Staphylococcus aureus (MRSA)-pyruvate kinase (PK), we tested our novel compounds as MRSA PK inhibitors and now report first inhibiting activities. We discuss structure-activity relationships
discover such novel structures have been dimerization or hybridization of known antibacterial agents. We found novel antibacterial agents by dimerization of indols and hybridization with carbazoles. They were obtained in a simple one-pot reaction as bisindole tetrahydrocarbazoles. Further oxidation led to bisindole carbazoles with varied substitutions of both the indole and the carbazole scaffold. Both the
对抗生素的持续耐药性发展也会影响最后的抗生素,这需要新的抗菌化合物。发现这种新结构的策略是已知抗菌剂的二聚化或杂交。我们通过吲哚的二聚化和与咔唑的杂交发现了新型抗菌剂。它们是在简单的一锅反应中以双吲哚四氢咔唑的形式获得的。进一步氧化导致双吲哚咔唑具有不同的吲哚和咔唑支架取代。四氢咔唑和咔唑均已在各种金黄色葡萄球菌中进行了评估菌株,包括 MRSA 菌株。由 MIC 值确定的那些 5-氰基取代衍生物显示出最佳活性。四氢咔唑部分超过咔唑化合物的活性,因此超过所用标准抗生素的活性。因此,可以确定有前景的先导化合物以进行进一步研究。
Discovery of bisindolyl-substituted cycloalkane-anellated indoles as novel class of antibacterial agents against S. aureus and MRSA
Antibiotic resistance is an ongoing problem in the treatment of bacterial diseases. Among the various antibacterial infections Staphylococcus aureus infections remain critical due to the increasing resistances, especially against the methicillin-resistant S. aureus (MRSA). We discovered novel antibacterial compounds with activities against both S. aureus and MRSA types. Structure-activity relationships (SAR) are discussed and show that the activity depends on the ring size of the anellated cycloalkane. Moreover, first substituent effects have been investigated for both the cycloalkane and the indole residues. (C) 2015 Elsevier Ltd. All rights reserved.
Novel Tetraindoles and Unexpected Cycloalkane Indoles from the Reaction of Indoles and Aliphatic Dialdehydes
作者:Mardia Telep El-Sayed、Kazem Ahmed Mahmoud、Frank W. Heinemann、Andreas Hilgeroth
DOI:10.1002/jhet.2542
日期:2017.1
The reaction of indoles with dialdehydes was studied for the first time. Mild reaction conditions using glacial acetic acid led to two novel kinds of reaction products: one designated as alkyl chain‐connected tetraindoles and the other one as bis(indolyl)‐substituted cycloalkaneindoles. The suggested reaction pathways are discussed. The indole substituents of the cycloalkaneindoles were either trans