European Journal of Chemistry 2015, 6(3), 254-260 | doi: | Get rights and content

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Quinazolinones linked amino acids derivatives as a new class of promising antimicrobial, antioxidant and anti-inflammatory agents

Kadalipura Puttaswamy Rakesh (1) , Suhas Ramesh (2) , Honnayakanahalli Marichennegowda Manu Kumar (3) , Shivamallu Chandan (4) , Dase Channe Gowda (5,*)

(1) Department of Studies in Chemistry, University of Mysore, Manasagangotri, Mysore, 570006, Karnataka, India
(2) Department of Studies in Chemistry, University of Mysore, Manasagangotri, Mysore, 570006, Karnataka, India
(3) Department of Studies in Chemistry, University of Mysore, Manasagangotri, Mysore, 570006, Karnataka, India
(4) Department of Studies in Chemistry, University of Mysore, Manasagangotri, Mysore, 570006, Karnataka, India
(5) Department of Studies in Chemistry, University of Mysore, Manasagangotri, Mysore, 570006, Karnataka, India
(*) Corresponding Author

Received: 22 Dec 2014 | Revised: 02 Mar 2015 | Accepted: 28 Mar 2015 | Published: 30 Sep 2015 | Issue Date: September 2015


Two series of amino acids conjugated quinazolinones (1a-h and 2a-h) were synthesized by acid-amine coupling and the structures of all the compounds were confirmed through spectroscopic techniques such as IR, NMR and HRMS. The synthesized compounds were evaluated for their antimicrobial, antioxidant and anti-inflammatory activities. Biological evaluation study revealed that, the compounds 1f, 2f, 2g and 1g showed good antioxidant activity with 50% of the inhibition concentration (IC50) values 35, 20, 30 and 40 µg/mL, respectively, much better than the standard BHT (IC50 = 45 µg/mL). The compounds 1g, 2e and 2g found to have promising anti-inflammatory activity and almost all the synthesized compounds exhibited good antimicrobial activities (antibacterial and antifungal) against all the selected pathogenic bacteria and fungi. Conjugates containing Trp, Tyr and Pro have shown better activity than the rest of the analogues in the series. The structure-activity relationship was established for these compounds.


Amino acids; Conjugation; Quinazolinones; Antioxidant activity; Antimicrobial activity; Anti-inflammatory activity

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DOI: 10.5155/eurjchem.6.3.254-260.1233

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Center with Potential for Excellence in a Particular Area (CPEPA), UGC, New Delhi



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How to cite

Rakesh, K.; Ramesh, S.; Kumar, H.; Chandan, S.; Gowda, D. Eur. J. Chem. 2015, 6(3), 254-260. doi:10.5155/eurjchem.6.3.254-260.1233
Rakesh, K.; Ramesh, S.; Kumar, H.; Chandan, S.; Gowda, D. Quinazolinones linked amino acids derivatives as a new class of promising antimicrobial, antioxidant and anti-inflammatory agents. Eur. J. Chem. 2015, 6(3), 254-260. doi:10.5155/eurjchem.6.3.254-260.1233
Rakesh, K., Ramesh, S., Kumar, H., Chandan, S., & Gowda, D. (2015). Quinazolinones linked amino acids derivatives as a new class of promising antimicrobial, antioxidant and anti-inflammatory agents. European Journal of Chemistry, 6(3), 254-260. doi:10.5155/eurjchem.6.3.254-260.1233
Rakesh, Kadalipura, Suhas Ramesh, Honnayakanahalli Marichennegowda Manu Kumar, Shivamallu Chandan, & Dase Channe Gowda. "Quinazolinones linked amino acids derivatives as a new class of promising antimicrobial, antioxidant and anti-inflammatory agents." European Journal of Chemistry [Online], 6.3 (2015): 254-260. Web. 9 Feb. 2023
Rakesh, Kadalipura, Ramesh, Suhas, Kumar, Honnayakanahalli, Chandan, Shivamallu, AND Gowda, Dase. "Quinazolinones linked amino acids derivatives as a new class of promising antimicrobial, antioxidant and anti-inflammatory agents" European Journal of Chemistry [Online], Volume 6 Number 3 (30 September 2015)

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