Antistaphylococcal evaluation of indole–naphthalene hybrid analogs
摘要:
Resistance developments against established antibiotics are an emerging problem for antibacterial therapies. Infections with Staphylococcus aureus and methicillin-resistant S. aureus (MRSA) have become more difficult to treat with standard antibiotics that often fail, especially against MRSA. In consequence, novel antibiotics are urgently needed. Antibiotics from natural sources own complicated structures that cause difficulties for a chemical synthetic production. We developed novel small-molecule antibacterials that are easily accessible in a simple one-pot synthesis. The central indolonaphthalene core is substituted with indole residues at various positions. Both the varied indole substitutions and their positions at the molecular scaffold influence the determined antibacterial activity against the evaluated Staphylococcus strains. Best activities have been found for 5-chloro, -cyano, and -hydroxyl indole substitutions. Therefore, first promising lead compounds could be identified that are nontoxic in human HEK and SH-SY5Y cells and exceed the activity of used standard antibiotics, especially against MRSA.
Mechanism-controlled regioselective synthesis of indolyl benzo[b]carbazoles
作者:David StC. Black、Donald C. Craig、Mardi Santoso
DOI:10.1016/s0040-4039(99)01268-x
日期:1999.9
Benzo[b]carbazoles can be synthesised readily and in good yields from the combination of 2,3-unsubstituted indoles and o-phthaldialdehyde in the presence of acid catalysts. Use of phosphoryl chloride in chloroform gives rapid reactions and yields 11-(3-indolyl)benzo[b]carbazoles, whereas the use of p-toluenesulfonic acid in methanol gives slow reactions and yields the isomeric 6-(3-indolyl)benzo[b]carbazoles
在酸催化剂的存在下,由2,3-未取代的吲哚和邻苯二甲醛的组合可以容易地并且以高收率合成苯并[ b ]咔唑。在氯仿中使用磷酰氯可快速反应,生成11-(3-吲哚基)苯并[ b ]咔唑,而在甲醇中使用对甲苯磺酸,则反应缓慢,并生成异构体6-(3-吲哚基)苯并[ b ]咔唑。
DERIVATE VON INDOLEN UND CARBAZOLEN, VERFAHREN ZU IHRER HERSTELLUNG SOWIE DEREN VERWENDUNG ALS MRSA-SENSITIVE ANTIBIOTIKA
申请人:Martin-Luther-Universität Halle-Wittenberg
公开号:EP2968271A1
公开(公告)日:2016-01-20
[DE] DERIVATE VON INDOLEN UND CARBAZOLEN, VERFAHREN ZU IHRER HERSTELLUNG SOWIE DEREN VERWENDUNG ALS MRSA-SENSITIVE ANTIBIOTIKA<br/>[EN] DERIVATIVES OF INDOLES AND CARBAZOLES, METHOD FOR THE PRODUCTION THEREOF AND USE THEREOF AS MRSA-SENSITIVE ANTIBIOTICS<br/>[FR] DÉRIVÉS D'INDOLS ET DE CARBAZOL, PROCÉDÉ POUR LES PRÉPARER ET LEUR UTILISATION COMME ANTIBIOTIQUE ACTIFS SUR LE SARM
申请人:MARTIN LUTHER UNIVERSITÄT HALLE WITTENBERG
公开号:WO2014139512A1
公开(公告)日:2014-09-18
Die erfindungsgemäß entwickelten 1,3-Bis(indol-3-yl)-tetrahydrocyclopenta[b]indole, 1,4-Bis(indol-3-yl)-tetrahydrocarbazole, 6,10-Bis(indol-3-yl)-hexahdrocyclohepta[b]indole, 6,11-Bis(indol-3-yl)-hexahydrocycloocta[b]indole und 11-(lndol-3-yl)-benzo[b]carbazole der allgemeinen Formeln (I) und (II) wirken selektiv hemmend auf das Wachstum von S. aureus und dem Methicillin-resistenten S. aureus (MRSA) im unteren micromolaren Konzentrationsbereich bei einem Screening an weiteren grampositiven und gramnegativen Bakterien und Pilzen. Die Darstellung der Verbindungen aus Dialdehyden und Indolen bei Raumtemperatur in Eisessig stellt ein schonendes Verfahren dar, in dem die neuen Strukturen in teilweise sehr guten Ausbeuten zugänglich sind.
Antistaphylococcal evaluation of indole&ndash;naphthalene hybrid analogs
作者:Kerolos Ashraf、Kaveh Yasrebi、Emmanuel Tola Adeniyi、Tobias Hertlein、Knut Ohlsen、Michael Lalk、Frank Erdmann、Andreas Hilgeroth
DOI:10.2147/dddt.s184965
日期:——
Resistance developments against established antibiotics are an emerging problem for antibacterial therapies. Infections with Staphylococcus aureus and methicillin-resistant S. aureus (MRSA) have become more difficult to treat with standard antibiotics that often fail, especially against MRSA. In consequence, novel antibiotics are urgently needed. Antibiotics from natural sources own complicated structures that cause difficulties for a chemical synthetic production. We developed novel small-molecule antibacterials that are easily accessible in a simple one-pot synthesis. The central indolonaphthalene core is substituted with indole residues at various positions. Both the varied indole substitutions and their positions at the molecular scaffold influence the determined antibacterial activity against the evaluated Staphylococcus strains. Best activities have been found for 5-chloro, -cyano, and -hydroxyl indole substitutions. Therefore, first promising lead compounds could be identified that are nontoxic in human HEK and SH-SY5Y cells and exceed the activity of used standard antibiotics, especially against MRSA.
Novel Effective Small-Molecule Antibacterials against Enterococcus Strains
Enterococcus species cause increasing numbers of infections in hospitals. They contribute to the increasing mortality rates, mostly in patients with comorbidities, who suffer from severe diseases. Enterococcus resistances against most antibiotics have been described, including novel antibiotics. Therefore, there is an ongoing demand for novel types of antibiotics that may overcome bacterial resistances. We discovered a novel class of antibiotics resulting from a simple one-pot reaction of indole and o-phthaldialdehyde. Differently substituted indolyl benzocarbazoles were yielded. Both the indole substitution and the positioning at the molecular scaffold influence the antibacterial activity towards the various strains of Enterococcus species with the highest relevance to nosocomial infections. Structure-activity relationships are discussed, and the first lead compounds were identified as also being effective in the case of a vancomycin resistance.