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Design and synthesis of 9 H ‐fluorenone based 1,2,3‐triazole analogues as Mycobacterium tuberculosis InhA inhibitors
Author(s) -
Suresh Amaroju,
Srinivasarao Singireddi,
Agnieszka Napiórkowska,
Ewa AugustynowiczKopeć,
Alvala Mallika,
Lherbet Christian,
Chandra Sekhar Kondapalli Venkata Gowri
Publication year - 2018
Publication title -
chemical biology and drug design
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.59
H-Index - 77
eISSN - 1747-0285
pISSN - 1747-0277
DOI - 10.1111/cbdd.13127
Subject(s) - inha , stereochemistry , chemistry , mycobacterium tuberculosis , minimum inhibitory concentration , triazole , in vitro , biochemistry , tuberculosis , organic chemistry , medicine , pathology
We prepared fifty various 9 H ‐fluorenone based 1,2,3‐triazole analogues varied with NH , –S–, and – SO 2 – groups using click chemistry. The target compounds were characterized by routine analytical techniques, 1 H, 13 CNMR , mass, elemental, single‐crystal XRD ( 8a ) and screened for in vitro antitubercular activity against Mycobacterium tuberculosis ( MTB ) H37Rv strain and two “wild” strains Spec. 210 and Spec. 192 and MIC 50 was determined. Further, the compounds were evaluated for MTB InhA inhibition study as well. The final analogues exhibited minimum inhibitory concentration ( MIC ) ranging from 52.35 to >295 μ m . Among the – NH – analogues, one compound 5p ( MIC 58.34 μ m ), among –S– containing analogues four compounds 8e ( MIC 66.94 μ m ), 8f ( MIC 74.20 μ m ), 8g ( MIC 57.55 μ m ), and 8q ( MIC 56.11 μ m ), among – SO 2 – containing compounds one compound 10p ( MIC 52.35 μ m ) showed less than MTB MIC 74.20 μ m : Compound 4‐(((9 H ‐fluoren‐9‐yl)sulfonyl)methyl)‐1‐(3,4,5‐trimethoxyphenyl)‐1 H ‐1,2,3‐triazole ( 10p ) was found to be the most active compound with 73% InhA inhibition at 50 μ m ; it inhibited MTB with MIC 52.35 μ m . Further, 10f and 10p were docked to crystal structure of InhA to know binding interaction pattern. Most active compounds were found to be non‐cytotoxic against HEK 293 cell lines at 50 μ m .