European Journal of Chemistry 2010, 1(2), 115-123 | doi: | Get rights and content

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Antimicrobial investigations on synthetic p-tolylazo derivatives of thienopyrimidinone based on an ortho funtionalized thiophene nucleus

Hatem M. Gaber (1,*) , Mark C. Bagley (2) , Sherif M. Sherif (3)

(1) National Organization for Drug Control and Research (NODCAR), Cairo, Egypt
(2) School of Chemistry, Main Building, Cardiff University, Park Place, Cardiff, CF10 3AT, U.K
(3) Department of Chemistry, Faculty of Science, Cairo University, Giza 12613, Egypt
(*) Corresponding Author

Received: 11 Apr 2010 | Accepted: 12 Apr 2010 | Published: 15 Jun 2010 | Issue Date: June 2010


New derivatives of thieno[2,3-d]pyrimidin-4-one, 4a-c, and 6 were respectively synthezised based on thiophene derivative, 2c,ortho-disposed amino and ester groups. Carbohydrazide, bearing 7, was obtained by hydrazinolysis of 3-ethoxycabonylmethyl derivative, 4c. Compounds 4b and 7 were used to build up two series of novel 3-substituted-methylthieno[2,3-d]pyrimidin-4-ones, 7-11, and their corresponding 3-substituted-amino analogues 12, 15a,b, 18, which were of significant interest for biological study. The new thieno[2,3-d]pyrimidin-4-one derivatives, with various groups in position 3, were screened for their preliminary antimicrobial activity against a representative panel of Gram-positive and Gram-negative bacteria as well as fungi strains. The compounds tested displayed different levels of antibacterial and antifungal effects, with the assays carried out on six pathogenic bacteria and six pathogenic fungi. Of these compounds, the 3-unsubstituted-thieno[2,3-d]pyrimidin-4(3H)-one, 4a, showed the lowest effect on pathogenic bacteria, while the corresponding 3-substituted analogues produced inhibitory effects against bacteria similar or superior to the reference drug Tetracycline. For those derivatives of thieno[2,3-d]pyrimidin-4-one in which the 3-position contains a methylene moiety, it has been observed that the antibacterial effect was in general found to be significantly higher than the corresponding analogues with a substituted-amino moiety in position 3. Despite promising in vitro antibacterial activity of the new thienopyrimidin-4-ones, only compounds 7, 10 and 11, among the compounds tested, exhibited some kind of antifungal activity. The detailed synthesis and biological screening data were reported.



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European Journal of Chemistry


Thienopyrimidinone; Aminoformylation; Acetylation; Hydrazinolysis; Antimicrobial activity

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DOI: 10.5155/eurjchem.1.2.115-123.56

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Funding information

Cardiff University, the Engineering and Physical Sciences Research Council (EPSRC) and the Biotechnology and Biological Sciences Research Council (BBSRC), in collaboration with the University of Wales College of Medicine, UK



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How to cite

Gaber, H.; Bagley, M.; Sherif, S. Eur. J. Chem. 2010, 1(2), 115-123. doi:10.5155/eurjchem.1.2.115-123.56
Gaber, H.; Bagley, M.; Sherif, S. Antimicrobial investigations on synthetic p-tolylazo derivatives of thienopyrimidinone based on an ortho funtionalized thiophene nucleus. Eur. J. Chem. 2010, 1(2), 115-123. doi:10.5155/eurjchem.1.2.115-123.56
Gaber, H., Bagley, M., & Sherif, S. (2010). Antimicrobial investigations on synthetic p-tolylazo derivatives of thienopyrimidinone based on an ortho funtionalized thiophene nucleus. European Journal of Chemistry, 1(2), 115-123. doi:10.5155/eurjchem.1.2.115-123.56
Gaber, Hatem, Mark C. Bagley, & Sherif M. Sherif. "Antimicrobial investigations on synthetic p-tolylazo derivatives of thienopyrimidinone based on an ortho funtionalized thiophene nucleus." European Journal of Chemistry [Online], 1.2 (2010): 115-123. Web. 23 Sep. 2023
Gaber, Hatem, Bagley, Mark, AND Sherif, Sherif. "Antimicrobial investigations on synthetic p-tolylazo derivatives of thienopyrimidinone based on an ortho funtionalized thiophene nucleus" European Journal of Chemistry [Online], Volume 1 Number 2 (15 June 2010)

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