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Molecules 2008, 13(4), 958-976; doi:10.3390/molecules13040958

Synthesis and Biological Activity of Peptide Derivatives of Iodoquinazolinones/Nitroimidazoles

* ,  and
Department of Pharmaceutical Chemistry, Rajiv Academy for Pharmacy, Mathura-281001 (UP), India
* Author to whom correspondence should be addressed.
Received: 3 April 2008 / Revised: 18 April 2008 / Accepted: 19 April 2008 / Published: 24 April 2008
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Two substituted quinazolinyl/imidazolyl-salicylic acids 5, 6 were synthesized bythe reaction of 6-iodo-2-methylbenzoxazin-4-one/5-nitroimidazole with 5-aminosalicylicacid (5-ASA). Coupling of compounds 5 and 6 with different amino acid esterhydrochlorides, dipeptide and tripeptide methyl esters yielded novelquinazolino/imidazolopeptide derivatives 5a-f and 6a-g. The chemical structures of allnewly synthesized compounds were confirmed by means of FT-IR, 1H- and 13C-NMR, MSand elemental analysis. Selected peptide ester derivatives were further hydrolyzed by usinglithium hydroxide (LiOH) to afford the corresponding acid derivatives 5ba-da and 6ea-ga.All peptide derivatives were assayed for antimicrobial and anthelmintic activities againsteight pathogenic microbes and three earthworm species. Among the tested compounds, 5e,5d, 6e and their hydrolyzed analogs 5da and 6ea exhibited higher antimicrobial activityagainst Pseudomonas aeruginosa, Klebsiella pneumoniae and Candida albicans, and 5a,6g and 6ga displayed better antifungal activity against the dermatophytes Trichophytonmentagrophytes and Microsporum audouinii. Moreover, 6f and its hydrolyzed derivative6fa showed good anthelmintic activity against Megascoplex konkanensis, Pontoscotexcorethruses and Eudrilus eugeniea at dose of 2 mg mL–1.
Keywords: Quinazolinone; imidazole; 5-aminosalicylic acid; peptides; antimicrobial activity; anthelmintic activity. Quinazolinone; imidazole; 5-aminosalicylic acid; peptides; antimicrobial activity; anthelmintic activity.
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Dahiya, R.; Kumar, A.; Yadav, R. Synthesis and Biological Activity of Peptide Derivatives of Iodoquinazolinones/Nitroimidazoles. Molecules 2008, 13, 958-976.

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