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Pflégr V, Stolaříková J, Pál A, Korduláková J, Krátký M. Novel pyrimidine-1,3,4-oxadiazole hybrids and their precursors as potential antimycobacterial agents. Future Med Chem 2023; 15:1049-1067. [PMID: 37555280 DOI: 10.4155/fmc-2023-0096] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/10/2023] Open
Abstract
Background: Molecular hybridization and isostery are proven approaches in medicinal chemistry, and as such we used them to design novel compounds that we investigated as potential antimycobacterials to combat drug-resistant strains. Methods & results: Prepared N-alkyl-2-(pyrimidine-5-carbonyl)hydrazine-1-carboxamides were cyclized to N-alkyl-5-(pyrimidin-5-yl)-1,3,4-oxadiazol-2-amines along with their analogues. A total of 48 compounds were tested against Mycobacterium tuberculosis H37Rv, Mycobacterium avium and Mycobacterium kansasii, with oxadiazoles and C8-C12 alkyls being the most effective from a concentration of 2 μM. Multidrug-resistant strains were inhibited at same concentrations as the susceptible strain. For the most potent N-dodecyl-5-(pyrimidin-5-yl)-1,3,4-oxadiazol-2-amine, the mechanism of action related to cell wall biosynthesis was investigated. Conclusion: Pyrimidine-1,3,4-oxadiazole hybrids are unique antimycobacterial agents inhibiting mainly M. tuberculosis strains without cross-resistance to current drugs and are thus promising drug candidates.
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Affiliation(s)
- Václav Pflégr
- Department of Organic & Bioorganic Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Akademika Heyrovského 1203, 500 05, Hradec Králové, Czech Republic
| | - Jiřina Stolaříková
- Laboratory for Mycobacterial Diagnostics & Tuberculosis, Regional Institute of Public Health in Ostrava, Partyzánské náměstí 7, Ostrava, Czech Republic
| | - Adrián Pál
- Department of Biochemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina CH-1, Ilkovičova 6, 842 15, Bratislava, Slovakia
| | - Jana Korduláková
- Department of Biochemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina CH-1, Ilkovičova 6, 842 15, Bratislava, Slovakia
| | - Martin Krátký
- Department of Organic & Bioorganic Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Akademika Heyrovského 1203, 500 05, Hradec Králové, Czech Republic
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Shi HB, Zhai ZW, Min LJ, Han L, Sun NB, Cantrell CL, Bajsa-Hirschel J, Duke SO, Liu XH. Synthesis and pesticidal activity of new 1,3,4-oxadiazole thioether compounds containing a trifluoromethylpyrazoyl moiety. RESEARCH ON CHEMICAL INTERMEDIATES 2022. [PMCID: PMC9486790 DOI: 10.1007/s11164-022-04839-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
In order to find new lead compounds with high pesticidal activity, a series of 1,3,4-oxadiazole thioether compounds (5 series) were designed by using penthiopyrad as a synthon. They were synthesized easily via five steps by using ethyl 4,4,4-trifluoro-3-oxobutanoate and triethyl orthoformate as starting materials. The synthesized compounds were characterized by 1H NMR, 13C NMR and HRMS. The compound 2-(benzylthio)-5-(1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl)-1,3,4-oxadiazole (5a) was further determined by X-ray single-crystal diffraction. It crystallized in the monoclinic system, space group P21/c, Z = 4. All the 1,3,4-oxadiazole thioether derivatives were screened for fungicidal activity against ten fungi and herbicidal activity against two weeds. The bioassay results indicated that some of the synthesized 1,3,4-oxadiazole compounds exhibited good fungicidal activity (> 50% inhibition) against the plant pathogens Sclerotinia sclerotiorum and Rhizoctonia solani at 50 μg/mL. Some of them exhibited certain herbicidal activity, and compounds 2-((3-chlorobenzyl)thio)-5-(1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl)-1,3,4-oxadiazole (5e) and 2-((4-bromobenzyl)thio)-5-(1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl)-1,3,4-oxadiazole (5 g) had bleach effect. Molecular docking is to find the best fit orientation of the 2-((4-bromobenzyl)thio)-5-(1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl)-1,3,4-oxadiazole (5 g) molecule with the SDH protein (PDB: 2FBW). The docking results indicate that the compound 5 g and the lead compound penthiopyrad have similar binding interactions with SDH and carbonyl is a key group for these compounds.
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Affiliation(s)
- Hai-Bo Shi
- Chemical Engineering College, Ningbo Polytechnic, Ningbo, 315800 China
| | - Zhi-Wen Zhai
- College of Life Science, Huzhou University, Huzhou, 313000 China
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310014 China
| | - Li-Jing Min
- College of Life Science, Huzhou University, Huzhou, 313000 China
| | - Liang Han
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310014 China
| | - Na-Bo Sun
- College of Biology and Environmental Engineering, Zhejiang Shuren University, Hangzhou, 310015 Zhejiang China
| | - Charles L. Cantrell
- Natural Products Utilization Research Unit, USDA ARS, University, MS 38677 USA
| | | | - Stephen O. Duke
- National Center for Natural Product Research, School of Pharmacy, University of Mississippi, P.O. Box 1848, University, MS 38677 USA
| | - Xing-Hai Liu
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310014 China
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