Amphiphilic Indole Derivatives as Antimycobacterial Agents: Structure–Activity Relationships and Membrane Targeting Properties
作者:Tianming Yang、Wilfried Moreira、Samuel Agyei Nyantakyi、Huan Chen、Dinah binte Aziz、Mei-Lin Go、Thomas Dick
DOI:10.1021/acs.jmedchem.6b01530
日期:2017.4.13
Antibacterials that disrupt cell membrane function have the potential to eradicate "persister" organisms and delay the emergence of resistance. Here we report the antimycobacterial activities of 4-fluoro and 6-methoxyindoles bearing a cationic amphiphilic motif represented by a lipophilic n-octyl side chain at position 1 and a positively charged azepanyl or 1,4-dioxa-8-azaspiro[4.5]decane moiety at position 3. These analogues exhibited balanced profiles of potency (Mycobacterium bovis BCG, M tuberculosis H37Rv), selective activity, solubility, and metabolic stability. Bacteriological mechanism of action investigations on a representative analogue revealed cell membrane permeabilization and depolarization in M bovis BCG. These membrane-related changes preceded cell death indicating that the loss in membrane integrity was not an epiphenomenon. Bactericidal activity was observed against both growing and nongrowing mycobacterial cultures. The analogue also upregulated cell envelope stress inducible promoters piniBAC and pclgR, implicating the involvement of envelope-related targets in its mode of action.
Stable Bromiranium Ion Salts as Reagents for Biomimetic Indole Terpenoid Cyclizations
作者:Jonathan Bock、Constantin G. Daniliuc、Ulrich Hennecke
DOI:10.1021/acs.orglett.9b00259
日期:2019.3.15
Indole terpene alkaloids are a diverse group of natural products and show significant biological activities. To enable their biomimetic synthesis, electrophilic bromocyclization of polyenyl indole derivatives could be achieved using sterically demanding bromiranium ion salts with the weakly coordinating counterion BArF– as reagent. Starting from polyenyl indole derivatives, the corresponding bromocyclization
Design, synthesis, biological evaluation and molecular modelling studies of conophylline inspired novel indolyl oxoacetamides as potent pancreatic lipase inhibitors
作者:Sridhar S. N. C.、Saksham Palawat、Atish T. Paul
DOI:10.1039/d0nj02622k
日期:——
Twenty-one indolyl oxoacetamides were designed and synthesized inspired by conophylline. Analogues 12c and 12b with N-geranyl substitution on indole exhibited potent pancreatic lipase inhibition.