Journal of Chemical Sciences

, 130:119 | Cite as

Synthesis and biological evaluation of novel benzothiophene derivatives

  • Muheb A S Algso
  • Arif KivrakEmail author
  • Metin Konus
  • Can Yilmaz
  • Aslihan Kurt-Kizildoğan
Regular Article


Benzothiophene derivatives were synthesized regioselectively using coupling reactions and electrophilic cyclization reactions. Antimicrobial properties of isolated compounds were tested against indicator microorganisms such as C. albicans ATCC 10231,  B. subtilis ATCC 6633, E. coli ATCC 25922 and S. aureus ATCC 25923. 3-(4-aminobenzoethynyl)-2-(thiophen-2-yl) benzo[b]thiophene (12E), 3-ethynyl-2-(thiophen-2-yl) benzo[b]thiophene (12L) and 3-(2-aminobenzoethynyl)-2-(thiophen-2-yl) benzo[b]thiophene (12J) displayed high antibacterial activity against S. aureus. Further, 3-iodo-2-(thiophen-2-yl) benzo[b]thiophene (10) and 3-(trimethylsilylethynyl)-2-(thiophen-2-yl) benzo[b] thiophene (12K) were found to have potentials to be used as antifungal agents against current fungal diseases. Novel 3-(1H-indole-2-yl)-2-(thiophen-2-yl) benzo[b] thiophene (16) and 3-(4-aminobenzoethynyl)-2-(thiophen-2-yl) benzo[b] thiophene (12E) also showed quite high antioxidant capacities with TEAC values of 2.5 and 1.1, respectively; which surpassed the antioxidant capacity of an universally accepted reference of trolox.

Graphical Abstract

Benzothiophene derivatives were synthesized regioselectively using coupling reactions and electrophilic cyclization reactions. Antimicrobial properties of the compounds were tested against four indicator microorganisms, and a few displayed high antibacterial activity against S. aureus. 3-(1H-indole-2-yl)-2-(thiophen-2-yl)benzo[b]thiophene (16) and 3-(4-aminobenzoethynyl)-2-(thiophen-2-yl)benzo[b]thiophene (12E) showed high antioxidant capacities which are better than the reference of trolox.


Benzothiophenes heteroaromatic compounds biological properties antioxidant capacity anti-microbial agents 



The authors thank to The Scientific and Technological Research Council of Turkey (Project No: 115Z020) for financial supporting of silica gels, column chromatographic solvents, all other reactants and reagents. Authors, also, thank Van Yüzüncü Yil University (Project No: FBA-2017-6007) for financial supporting of glassware and salts and University of Duhok for a scholarship to Muheb A. S. Algso.

Supplementary material

12039_2018_1523_MOESM1_ESM.pdf (7.6 mb)
Supplementary material 1 (pdf 7735 KB)


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Copyright information

© Indian Academy of Sciences 2018

Authors and Affiliations

  • Muheb A S Algso
    • 1
  • Arif Kivrak
    • 1
    Email author
  • Metin Konus
    • 2
  • Can Yilmaz
    • 2
  • Aslihan Kurt-Kizildoğan
    • 3
  1. 1.Department of ChemistryVan Yüzüncü Yil UniversityVanTurkey
  2. 2.Department of Molecular Biology and GeneticsVan Yüzüncü Yil UniversityVanTurkey
  3. 3.Department of Agricultural Biotechnology, Faculty of AgricultureOndokuz Mayıs UniversitySamsunTurkey

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