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Tsemeugne J, Bah YA, Dzoyem JP, Ndefongang JN, Famuyide IM, McGaw LJ, Nangmo PK, Ouahouo BMW, Mkounga P, Edwards G, Simon PFW, Tsopmo A, Sopbué EF, Nkengfack AE. Synthesis and anticancer activity evaluation of some new 1,2,3,5-tetrazine derivatives attached to benzothiazole moiety. ARKIVOC 2022. [DOI: 10.24820/ark.5550190.p011.866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Tsemeugne J, Nangmo PK, Mkounga P, Tamokou JDD, Kengne IC, Edwards G, Sopbué EF, Nkengfack AE. Synthesis, characteristic fragmentation patterns, and antibacterial activity of new azo compounds from the coupling reaction of diazobenzothiazole ions and acetaminophen. HETEROCYCL COMMUN 2021. [DOI: 10.1515/hc-2020-0127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Abstract
In this study, a series of azobenzothiazole dyes 4 were synthesized via diazotization of substituted benzothiazole derivatives followed by azo coupling with acetaminophen. The chemical structures of all synthesized compounds were confirmed using analytical data and spectroscopic techniques, including UV-visible, IR, mass spectra, and 1H- and 13C-NMR. The in situ formed diazobenzothiazole ions regiospecifically react with acetaminophen derivatives in the Hollemann-guided electrophilic aromatic substitution mechanism. The regio-orientations were established, on the one hand, by a rigorous interpretation of 1H-NMR spectra and, on the other hand, by the characteristic fragmentation patterns observed on the electrospray mass spectra. In the cases of 4a and 4b, multisubstitutions occurred. The antimicrobial activity of compound 4, along with all the starting materials, was investigated on Pseudomonas aeruginosa PA01, Staphylococcus aureus 18, Escherichia coli 64R, and S. aureus ATCC 25923. The results showed that this skeletal framework exhibited marked potency as antibacterial agents. The most active antibacterial agent against both targeted organisms was compound 4a′.
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Affiliation(s)
- Joseph Tsemeugne
- Laboratory of Natural Products and Applied Organic Synthesis (LANAPOS), Department of Organic Chemistry, University of Yaounde I , P.O. Box 812 , Yaounde , Republic of Cameroon
| | - Pamela Kemda Nangmo
- Laboratory of Natural Products and Applied Organic Synthesis (LANAPOS), Department of Organic Chemistry, University of Yaounde I , P.O. Box 812 , Yaounde , Republic of Cameroon
- Institute of Medical Research and Medicinal Plants Studies (IMPM), Ministry of Scientific Research and Innovation , P.O. Box 13033 , Yaounde , Republic of Cameroon
| | - Pierre Mkounga
- Laboratory of Natural Products and Applied Organic Synthesis (LANAPOS), Department of Organic Chemistry, University of Yaounde I , P.O. Box 812 , Yaounde , Republic of Cameroon
| | - Jean De Dieu Tamokou
- Laboratory of Microbiology and Antimicrobial Substances, Department of Biochemistry, Faculty of Science, University of Dschang , P.O. Box 067 , Dschang , Republic of Cameroon
| | - Iréne Chinda Kengne
- Laboratory of Microbiology and Antimicrobial Substances, Department of Biochemistry, Faculty of Science, University of Dschang , P.O. Box 067 , Dschang , Republic of Cameroon
| | - Giles Edwards
- Department of Physics and Astronomy, The University of Manchester , Oxford Road, Manchester, M13 9PL , Oxford , United Kingdom
| | - Emmanuel Fondjo Sopbué
- Laboratory of Applied Synthetic Organic Chemistry, Department of Chemistry, Faculty of Science, University of Dschang , P.O. Box 67 , Dschang , Republic of Cameroon
| | - Augustin Ephrem Nkengfack
- Laboratory of Natural Products and Applied Organic Synthesis (LANAPOS), Department of Organic Chemistry, University of Yaounde I , P.O. Box 812 , Yaounde , Republic of Cameroon
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Tsemeugne J, Shinyuy LM, Djeukoua SKD, Sopbue EF, Ngemenya MN. Evaluation of macrofilaricidal and microfilaricidal activities against Onchocerca ochengi and cytotoxicity of some synthesized azo compounds containing thiophene backbone. Parasitol Res 2021; 120:2087-2094. [PMID: 33864105 DOI: 10.1007/s00436-021-07162-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Accepted: 04/11/2021] [Indexed: 10/21/2022]
Abstract
Control and treatment of onchocerciasis, a devastating tropical filarial disease caused by Onchocerca volvulus, rely solely on the community directed treatment with ivermectin. However, ivermectin is only microfilaricidal with evidence of resistance of the parasite among other limitations, which necessitate the search for new efficacious and safe filaricides. Ten synthetic thienylazoryl dyes were screened in vitro against adult and microfilariae worm stages of Onchocerca ochengi based on worm motility and MTT formazan assay. Cytotoxicity of active compounds was assessed on monkey kidney epithelial cells (LLC-MK2) using the MTT formazan assay. Seven (7) compounds showed both macrofilaricidal activity against adult male worms and microfilaricidal activity among which three 4a, 4c and 4e recorded the highest activity (IC50 = 4.2 to 8.8μM) against adult male worms, comparable to some standard anthelmintics. Five compounds showed rapid activity against microfilariae with 100% inhibition after 24-h incubation. The active compounds were nontoxic on monkey kidney cells (CC50> 4μg/mL), but their selectivity index values were relatively low (≤ 3). The thienylazoaryls with both macrofilaricidal and microfilaricidal activities may yield molecules which could be used for eradication of onchocerciasis following further medicinal chemistry modification of their structures to enhance their selectivity.
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Affiliation(s)
- Joseph Tsemeugne
- Department of Organic Chemistry, University of Yaounde I, P.O. Box 812, Yaounde, Cameroon
| | - Lahngong M Shinyuy
- Department of Biochemistry and Molecular Biology, University of Buea, P.O. Box 63, Buea, South West Region, Cameroon
| | - Sorel K D Djeukoua
- Laboratory of Applied Synthetic Organic Chemistry, Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Emmanuel F Sopbue
- Laboratory of Applied Synthetic Organic Chemistry, Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Moses N Ngemenya
- Department of Biochemistry and Molecular Biology, University of Buea, P.O. Box 63, Buea, South West Region, Cameroon. .,Department of Medical Laboratory Sciences, Faculty of Health Sciences, University of Buea, P.O. Box 63, Buea, South West Region, Cameroon.
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Djeukoua KSD, Fondjo ES, Tamokou JDD, Tsemeugne J, Simon PFW, Tsopmo A, Tchieno FMM, Ekom SE, Pecheu CN, Tonle IK, Kuiateb JR. Synthesis, characterization, antimicrobial activities and electrochemical behavior of new phenolic azo dyes from two thienocoumarin amines. ARKIVOC 2020. [DOI: 10.24820/ark.5550190.p010.994] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Tsemeugne J, Sopbué Fondjo E, Tamokou JDD, Tonle I, Kengne IC, Ngongang AD, Lacmata ST, Rohand T, Kuiate JR, Sondengam BL. Electrochemical behavior and in-vitro antimicrobial screening of some thienylazoaryls dyes. Chem Cent J 2017; 11:119. [PMID: 29159480 PMCID: PMC5696270 DOI: 10.1186/s13065-017-0345-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Accepted: 11/10/2017] [Indexed: 11/17/2022] Open
Abstract
Background A series of recently reported phenolic azo dyes 7a–e were prepared by coupling the thienyl diazonium sulfate of 3-Amino-4H-benzo[f]thieno[3,4-c](2H)chromen-4-one with selected diversely substituted phenolic and naphtholic derivatives. These compounds were evaluated for their antibacterial and antifungal activities. Furthermore their voltammetric behavior was compared at a glassy carbon electrode. Results The voltammetric behavior of the five recently reported azo dyes has been compared at a glassy carbon electrode. It is shown that the azo dyes 7a–e with a hydroxyl group in the ortho position with respect to the azo bridge give rise to well defined, irreversible peaks for the oxidation and reduction process within a pH range of 2–7. The mechanisms of electrochemical oxidation of compound 7a–c and 7e are proposed. For the hydroxyl-substituted dyes, re-oxidation peaks were obtained in the subsequent scan. The antimicrobial activities of the reported compounds 7a–e along with the entire precursors 1–4 and 6a–e were performed against selected bacterial and fungal species and their activities compared to those of nystatin, griseofulvin and ciprofloxacin used as reference drugs. Conclusions The present study showed significant antimicrobial activity of compounds 6d, 7a and 7c,e against the tested microorganisms; this result confirms the antimicrobial potency of azo compounds and some of their precursors.
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Affiliation(s)
- Joseph Tsemeugne
- Laboratory of Applied Synthetic Organic Chemistry, Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Republic of Cameroon.,Department of Organic Chemistry, University of Yaounde I, P.O. Box 812, Yaounde, Republic of Cameroon
| | - Emmanuel Sopbué Fondjo
- Laboratory of Applied Synthetic Organic Chemistry, Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Republic of Cameroon.
| | - Jean-de-Dieu Tamokou
- Laboratory of Microbiology and Antimicrobial Substances, Department of Biochemistry, Faculty of Science, University of Dschang, PO Box 067, Dschang, Republic of Cameroon
| | - Ignas Tonle
- Laboratory of Applied Synthetic Organic Chemistry, Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Republic of Cameroon
| | - Irene Chinda Kengne
- Laboratory of Microbiology and Antimicrobial Substances, Department of Biochemistry, Faculty of Science, University of Dschang, PO Box 067, Dschang, Republic of Cameroon
| | - Arnaud Djintchui Ngongang
- Laboratory of Applied Synthetic Organic Chemistry, Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Republic of Cameroon
| | - Stephen Tamekou Lacmata
- Laboratory of Microbiology and Antimicrobial Substances, Department of Biochemistry, Faculty of Science, University of Dschang, PO Box 067, Dschang, Republic of Cameroon
| | - Taoufik Rohand
- Laboratory of Analytical and Molecular Chemistry, Faculty Polydisciplinaire of Safi, University Cadi Ayyad Marrakech, Route Sidi Bouzid BP 4162, Safi, 46000, Morocco
| | - Jules Roger Kuiate
- Laboratory of Microbiology and Antimicrobial Substances, Department of Biochemistry, Faculty of Science, University of Dschang, PO Box 067, Dschang, Republic of Cameroon
| | - Beibam Luc Sondengam
- Department of Organic Chemistry, University of Yaounde I, P.O. Box 812, Yaounde, Republic of Cameroon
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Tamokou JDD, Tsemeugne J, Fondjo ES, Sarkar P, Kuiate JR, Djintchui AN, Sondengam BL, Bag PK. Antibacterial and Cytotoxic Activities and SAR of Some Azo Compounds Containing Thiophene Backbone. ACTA ACUST UNITED AC 2016. [DOI: 10.5567/pharmacologia.2016.182.192] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Fondjo ES, Tsemeugne J, De Dieu Tamokou J, Djintchui AN, Kuiate JR, Sondengam BL. Synthesis and antimicrobial activities of some novel thiophene containing azo compounds. HETEROCYCL COMMUN 2013. [DOI: 10.1515/hc-2013-0096] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Fondjo ES, Tsemeugne J, Sondengam BL, Oppenlaender T, Wabo HK, Tane P, Connolly JD, Dehaen W, Rohand T, Kikuchi H, Oshima Y. Coupling of two diazotized 3-aminothieno[3,4-c]coumarins with aromatic amines. J Heterocycl Chem 2011. [DOI: 10.1002/jhet.757] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Fogue PS, Lunga PK, Fondjo ES, De Dieu Tamokou J, Thaddée B, Tsemeugne J, Tchapi AT, Kuiate JR. Substituted 2-aminothiophenes: antifungal activities and effect on Microsporum gypseum protein profile. Mycoses 2011; 55:310-7. [DOI: 10.1111/j.1439-0507.2011.02089.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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