Design, Synthesis and Preliminary Antimicrobial Evaluation of N-Alkyl Chain Tethered C-5 Functionalized Bis-Isatins.

Abstract:

:A series of N-alkyl tethered C-5 functionalized bis-isatins were synthesized and evaluated for antimicrobial activity against pathogenic microorganisms. The preliminary evaluation studies revealed the compound 4t, with an optimal combination of bromo-substituent at the C-5 position of isatin ring along with propyl chain linker being most active among the synthesized series exhibiting an IC50 value of 3.72 μM against Trichomonas vaginalis while 4j exhibited an IC50 value of 14.8 μM against Naegleria fowleri, more effective than the standard drug Miltefosine. The compound 3f with an octyl spacer length was the most potent among the series against Giardia lamblia with an IC50 of 18.4 μM while 3d exhibited an IC50 of 23 μM against Entamoeba histolytica. This library was also screened against the fungal pathogen Aspergillus parasiticus. A number of the compounds demonstrated potency against this fungus, illustrating a possible broad-spectrum activity. Furthermore, an evaluation of these synthesized compounds against a panel of normal flora bacteria revealed them to be non-cytotoxic, demonstrating the selectivity of these compounds. This observation, in combination with previous studies that isatin is non-toxic to humans, presents a new possible scaffold for drug discovery against these important protozoal pathogens of humans and animals.

journal_name

Medchemcomm

journal_title

MedChemComm

authors

Singh A,Nisha,Bains T,Hahn HJ,Liu N,Tam C,Cheng LW,Kim J,Debnath A,Land KM,Kumar V

doi

10.1039/C7MD00434F

subject

Has Abstract

pub_date

2017-01-01 00:00:00

pages

1982-1992

issue

10

eissn

2040-2503

issn

2040-2511

journal_volume

8

pub_type

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