Journal
ORGANIC & BIOMOLECULAR CHEMISTRY
Volume 14, Issue 6, Pages 2041-2051Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ob02138c
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Funding
- Research Foundation-Flanders (FWO-Vlaanderen) [12N5915N]
- FWO (Flanders) [G005514N]
- NAFOSTED (Vietnam) [FWO.104.2013.12]
- IWT
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Tuberculosis has remained a challenge for medicinal chemists worldwide. In the framework of a collaborative program to identify and evaluate novel antitubercular candidate compounds, the biological properties of benzo[g]isoquinoline-5,10-diones have been found to be very promising. In this paper we have further expanded the library by incorporation of an amidinium moiety into the benzo[g] isoquinoline-5,10-dione scaffold. The presence of this functional group also increased the solubility of the quinones in polar solvents. To this purpose N-2-arylbenzo[g]isoquinoline-5,10-dione-3-iminium bromides were synthesized in a straightforward way by means of a reaction of anilines with 2-(bromomethyl)-3-(cyanomethyl)-1,4-dimethoxynaphthalene. Following the biological evaluation, N-2-(4-chlorophenyl)-5,10-dioxobenzo[g]isoquinoline-3(2H)-iminium bromide (MIC = 1.16 mu M, CC50 = 28.51 mu M, SI = 24.58) was selected as the most promising representative. Apart from the nano-molar anti-mycobacterial activity, the compound was able to target intracellular residing Mycobacterium tuberculosis and the susceptibility of a multi-drug-resistant strain towards the compound was confirmed.
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