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Guan X, Wang H, Zhang W, Xie Z. Asymmetric Total Synthesis of (+)-Hyperbeanol A. Org Lett 2025; 27:8-13. [PMID: 39696798 DOI: 10.1021/acs.orglett.4c02930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2024]
Abstract
A bioinspired alkylation dearomatization reaction was developed to construct the 5/6/6 fused-spiro tricyclic core framework and spiro-quaternary carbon chiral center. The usage of this approach for assembling these natural products of spirocyclic polycyclic polyprenylated acylphloroglucinols with an octahydrospiro-[cyclohexan-1,5'-indene] core is demonstrated by the first asymmetric total synthesis of highly oxidized hyperbeanol A.
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Affiliation(s)
- Xingchao Guan
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Haodong Wang
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Wanqiao Zhang
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Zhixiang Xie
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
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Stappert M, Kohnhäuser D, Seedorf T, Coetzee J, Rox K, Fuchs HLS, Cirnski K, Leitner C, Herrmann J, Kirschning A, Müller R, Brönstrup M. Synthetic studies on the tetrasubstituted D-ring of cystobactamids lead to potent terephthalic acid antibiotics. Commun Chem 2024; 7:252. [PMID: 39501041 PMCID: PMC11538350 DOI: 10.1038/s42004-024-01337-6] [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: 08/08/2024] [Accepted: 10/23/2024] [Indexed: 11/08/2024] Open
Abstract
Novel scaffolds for broad-spectrum antibiotics are rare and in strong demand because of the increase in antimicrobial resistance. The cystobactamids, discovered from myxobacterial sources, have a unique hexapeptidic scaffold with five arylamides and possess potent, resistance-breaking properties. This study investigates the role of the central D-ring pharmacophore in cystobactamids, a para-aminobenzoic acid (PABA) moiety that is additionally substituted by hydroxy and isopropoxy functions. We varied the two oxygenated substituents and replaced both amide connectors with bioisosteres. Synthetic routes were developed that included metal-mediated aromatic functionalization or heterocycle formations, leading to 19 novel analogues. The antibiotic efficacy of all analogues was determined against bacteria from the ESKAPE pathogen panel. While the replacement and the repositioning of hydroxy and isopropoxy substituents was not advantageous, exchanging PABA by terephthalic acid amides led to the highly potent analogue 42 with broad-spectrum activity, insensitivity towards AlbD-mediated degradation and promising pharmacokinetic properties in mice. The study highlights the steep structure-activity relationships in the tetrasubstituted D-ring and a surprisingly favorable reversion of the amide connecting C and D.
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Affiliation(s)
- Moritz Stappert
- Department of Chemical Biology, Helmholtz Centre for Infection Research, Braunschweig, Germany
- Institut für Organische Chemie und Biomolekulares Wirkstoffzentrum (BMWZ), Leibniz Universität Hannover Schneiderberg 1B, Hanover, Germany
| | - Daniel Kohnhäuser
- Department of Chemical Biology, Helmholtz Centre for Infection Research, Braunschweig, Germany
| | - Tim Seedorf
- Institut für Organische Chemie und Biomolekulares Wirkstoffzentrum (BMWZ), Leibniz Universität Hannover Schneiderberg 1B, Hanover, Germany
| | - Janetta Coetzee
- Helmholtz Institute for Pharmaceutical Research Saarland, Universitätscampus E8.1, Saarbrücken, Germany
| | - Katharina Rox
- Department of Chemical Biology, Helmholtz Centre for Infection Research, Braunschweig, Germany
- German Center for Infection Research (DZIF), site Hannover Braunschweig, Braunschweig, Germany
| | - Hazel L S Fuchs
- Department of Chemical Biology, Helmholtz Centre for Infection Research, Braunschweig, Germany
| | - Katarina Cirnski
- Helmholtz Institute for Pharmaceutical Research Saarland, Universitätscampus E8.1, Saarbrücken, Germany
| | - Christian Leitner
- Institut für Organische Chemie und Biomolekulares Wirkstoffzentrum (BMWZ), Leibniz Universität Hannover Schneiderberg 1B, Hanover, Germany
| | - Jennifer Herrmann
- Helmholtz Institute for Pharmaceutical Research Saarland, Universitätscampus E8.1, Saarbrücken, Germany
| | - Andreas Kirschning
- Institut für Organische Chemie und Biomolekulares Wirkstoffzentrum (BMWZ), Leibniz Universität Hannover Schneiderberg 1B, Hanover, Germany
- Uppsala Biomedical Center (BMC), University Uppsala, Uppsala, Sweden
| | - Rolf Müller
- Helmholtz Institute for Pharmaceutical Research Saarland, Universitätscampus E8.1, Saarbrücken, Germany
- German Center for Infection Research (DZIF), site Hannover Braunschweig, Braunschweig, Germany
| | - Mark Brönstrup
- Department of Chemical Biology, Helmholtz Centre for Infection Research, Braunschweig, Germany.
- Institut für Organische Chemie und Biomolekulares Wirkstoffzentrum (BMWZ), Leibniz Universität Hannover Schneiderberg 1B, Hanover, Germany.
- German Center for Infection Research (DZIF), site Hannover Braunschweig, Braunschweig, Germany.
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Zhang Y, Chen L, Jia Y. Total Synthesis of Pallamolides A-E. Angew Chem Int Ed Engl 2024; 63:e202319127. [PMID: 38504637 DOI: 10.1002/anie.202319127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Revised: 03/12/2024] [Accepted: 03/19/2024] [Indexed: 03/21/2024]
Abstract
We have achieved the first total synthesis of pallamolides A-E. Of these compounds, pallamolides B-E possess intriguing tetracyclic skeletons with novel intramolecular transesterifications. Key transformations include highly diastereoselective sequential Michael addition reactions to construct the bicyclo[2.2.2]octane core with the simultaneous generation of two quaternary carbon centers, a one-pot SmI2-mediated intramolecular ketyl-enoate cyclization/ketone reduction to generate the key oxabicyclo[3.3.1]nonane moiety, and an acid-mediated deprotection/oxa-Michael addition/β-hydroxy elimination cascade sequence to assemble the tetracyclic pallamolide skeleton. Kinetic resolution of ketone 14 through Corey-Bakshi-Shibata reduction enabled the asymmetric synthesis of pallamolides A-E.
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Affiliation(s)
- Yu Zhang
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, and Chemical Biology Center, Peking University, 38 Xueyuan Road, Beijing, 100191, P. R. China
| | - Lijun Chen
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, and Chemical Biology Center, Peking University, 38 Xueyuan Road, Beijing, 100191, P. R. China
| | - Yanxing Jia
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, and Chemical Biology Center, Peking University, 38 Xueyuan Road, Beijing, 100191, P. R. China
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Haroon M, Ahmad S, Fawad Zahoor A, Javed S, Nadeem Ahmad M, Gul Khan S, Al-Mutairi AA, Irfan A, Al-Hussain SA, Zaki ME. Grignard Reaction: An ‘Old-Yet-Gold’ synthetic gadget toward the synthesis of natural Products: A review. ARAB J CHEM 2024; 17:105715. [DOI: 10.1016/j.arabjc.2024.105715] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2025] Open
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