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Magnibou LM, Wouamba SCN, Yaya AJG, Mbougnia JF, Njateng GSS, Fotso GW, Henoumont C, Laurent S, Emmanuel T. Chemical profiling by UHPLC-Q-TOF-HRESI-MS/MS and antibacterial properties of Entada abyssinica (Fabaceae) constituents. Nat Prod Res 2023:1-11. [PMID: 37977828 DOI: 10.1080/14786419.2023.2280171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Accepted: 10/30/2023] [Indexed: 11/19/2023]
Abstract
A rapid untargeted UHPLC-Q-TOF-ESI-MS/MS-Based metabolomic profiling of the medicinal plant Entada abyssinica was performed. A total of 18 metabolites were detected, of which 10 could not be identified. Based on this result, an extensive chemical investigation of the CH2Cl2-MeOH (1:1) extract of this plant was carried out, leading to the isolation of a new ceramide, named entadamide (1), together with nine known compounds: monomethyl kolavate (2), 24-hydroxytormentic acid (3) chondrillasterol (4), 3-O-β-D glucopyranosylstigmasterol (5), 3-O-β-D glucopyranosylsitosterol (6), quercetin 3'-methylether (7), 2,3-dihydroxypropyl icosanoate (8), 2,3-dihydroxy-propyl 23-hydroxytricosanoate (9) and 2,3-dihydroxy-propyl 24-hydroxytetracosanoate (10). Their structures were elucidated by the analyses of their spectroscopic and spectrometric data (1D and 2D NMR, and HRESI-MS) in comparison with those reported in the literature. Furthermore, the crude extract and some isolated compounds were tested against non-ciprofloxacin resistant strains viz, Pseudomonas aeruginosa (ATCC 27853), Escherichia coli (ATCC 25922), Samonella thyphi (ATCC 19430) and Samonella enterica (NR4294). The tested samples demonstrated significant activity against all the tested bacteria (MIC values: 3.12-12.5 μg/mL).
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Affiliation(s)
- Larissa M Magnibou
- Department of Chemistry, Faculty of Science, University of Ngaoundéré, Ngaoundéré, Cameroon
| | - Steven C N Wouamba
- Laboratoire BONHEURS-EA 751, CY Cergy-Paris Université, Gennevilliers, France
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé 1, Yaoundé, Cameroon
| | - Abel J G Yaya
- Department of Chemistry, Faculty of Science, University of Ngaoundéré, Ngaoundéré, Cameroon
| | | | - Guy S S Njateng
- Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Ghislain W Fotso
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé 1, Yaoundé, Cameroon
| | - Celine Henoumont
- Department of General, Organic and Biomedical Chemistry, University of Mons, Mons, Belgium
| | - Sophie Laurent
- Department of General, Organic and Biomedical Chemistry, University of Mons, Mons, Belgium
| | - Talla Emmanuel
- Department of Chemistry, Faculty of Science, University of Ngaoundéré, Ngaoundéré, Cameroon
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Kratena N, Weil M, Gärtner P. A biomimetic approach for the concise total synthesis of greenwaylactams A-C. Org Biomol Chem 2023; 21:6317-6319. [PMID: 37496493 PMCID: PMC10410498 DOI: 10.1039/d3ob01001e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Accepted: 07/24/2023] [Indexed: 07/28/2023]
Abstract
A concise, racemic total synthesis of three sesquiterpenoid alkaloids (greenwaylactams A-C) exhibiting an unprecedented 8-membered benzolactam is disclosed. Key transformations of this work include the ring expansion through cleavage of an indole via Witkop oxidation, as well as an HFIP mediated cationic cyclisation to build up the pentacyclic carbon skeleton.
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Affiliation(s)
- Nicolas Kratena
- Institute for Applied Synthetic Chemistry, TU Wien, Getreidemarkt 9/163, 1060 Vienna, Austria.
| | - Matthias Weil
- Institute of Chemical Technologies and Analytics, TU Wien, Getreidemarkt 9/164, 1060 Vienna, Austria
| | - Peter Gärtner
- Institute for Applied Synthetic Chemistry, TU Wien, Getreidemarkt 9/163, 1060 Vienna, Austria.
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Hill RA, Sutherland A. Hot off the press. Nat Prod Rep 2021. [DOI: 10.1039/d1np90013g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A personal selection of 32 recent papers is presented covering various aspects of current developments in bioorganic chemistry and novel natural products such as eurysoloid A from Eurysolen gracilis.
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Affiliation(s)
- Robert A. Hill
- School of Chemistry, Glasgow University, Glasgow, G12 8QQ, UK
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