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Maliori A, Athanasiadou T, Psomiadou V, Bagkavou GG, Stathakis CI. Syntheses of ent-Aquilanol A and ent-Aquilanol B via Retro-Cycloisomerization of (-)-Caryophyllene Oxide. Access to Medium-Sized Oxygenated Carbocyclic Scaffolds. Org Lett 2022; 24:6242-6246. [PMID: 35997277 DOI: 10.1021/acs.orglett.2c02216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The first syntheses of the enantiomers of naturally occurring aquilanols A and B, two unprecedented 7/10 bicyclic sesquiterpenoids, are presented. Key features are a retro-cycloisomerization event on (-)-caryophyllene oxide to formulate the 11-membered carbocycle and an intramolecular epoxide opening to construct the bicyclic skeleton. The latter provides evidence of the plausible biosynthesis of natural compounds, rendering our syntheses biomimetic. Selective access to other medium-sized carbocyclic oxygenated compounds was achieved, enhancing the structural diversity of the final products.
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Affiliation(s)
- Anastasia Maliori
- Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 541 24, Greece
| | - Theodora Athanasiadou
- Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 541 24, Greece
| | - Venetia Psomiadou
- Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 541 24, Greece
| | - Georgia G Bagkavou
- Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 541 24, Greece
| | - Christos I Stathakis
- Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 541 24, Greece
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Blond A, Turcaud S, Lecourt T, Micouin L. Diastereoselective Ring Homologation of Bicyclic Hydrazines: Access to cis-1,3-Diaminocyclohexitols. ACS OMEGA 2018; 3:15302-15307. [PMID: 31458191 PMCID: PMC6643457 DOI: 10.1021/acsomega.8b02910] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Accepted: 11/01/2018] [Indexed: 06/10/2023]
Abstract
A sequence of oxidative cleavage/double nitroaldol condensation followed by a few simple synthetic transformations can lead to polyhydroxylated di- and triaminocyclohexanes from a readily available bicyclic hydrazine. This new synthetic route provides a simple and general access to densely substituted privileged scaffolds or fragments with a perfect control of their relative configuration.
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Affiliation(s)
- Aurélie Blond
- Laboratoire
de Chimie et de Biochimie Pharmacologiques et Toxicologiques, Faculté
des Sciences Fondamentales et Biomédicales, UMR 8601, CNRS-Paris Descartes University, 45 rue des Saints Pères, Paris 75006, France
| | - Serge Turcaud
- Laboratoire
de Chimie et de Biochimie Pharmacologiques et Toxicologiques, Faculté
des Sciences Fondamentales et Biomédicales, UMR 8601, CNRS-Paris Descartes University, 45 rue des Saints Pères, Paris 75006, France
| | - Thomas Lecourt
- Normandie
Université, INSA Rouen, UNIROUEN, CNRS, COBRA
UMR 6014, Rouen 76000, France
| | - Laurent Micouin
- Laboratoire
de Chimie et de Biochimie Pharmacologiques et Toxicologiques, Faculté
des Sciences Fondamentales et Biomédicales, UMR 8601, CNRS-Paris Descartes University, 45 rue des Saints Pères, Paris 75006, France
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Grunenberg J, Licari G. Effective in silico prediction of new oxazolidinone antibiotics: force field simulations of the antibiotic-ribosome complex supervised by experiment and electronic structure methods. Beilstein J Org Chem 2016; 12:415-28. [PMID: 27340438 PMCID: PMC4902031 DOI: 10.3762/bjoc.12.45] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Accepted: 02/16/2016] [Indexed: 12/16/2022] Open
Abstract
We propose several new and promising antibacterial agents for the treatment of serious Gram-positive infections. Our predictions rely on force field simulations, supervised by first principle calculations and available experimental data. Different force fields were tested in order to reproduce linezolid's conformational space in terms of a) the isolated and b) the ribosomal bound state. In a first step, an all-atom model of the bacterial ribosome consisting of nearly 1600 atoms was constructed and evaluated. The conformational space of 30 different ribosomal/oxazolidinone complexes was scanned by stochastic methods, followed by an evaluation of their enthalpic penalties or rewards and the mechanical strengths of the relevant hydrogen bonds (relaxed force constants; compliance constants). The protocol was able to reproduce the experimentally known enantioselectivity favoring the S-enantiomer. In a second step, the experimentally known MIC values of eight linezolid analogues were used in order to crosscheck the robustness of our model. In a final step, this benchmarking led to the prediction of several new and promising lead compounds. Synthesis and biological evaluation of the new compounds are on the way.
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Affiliation(s)
- Jörg Grunenberg
- Institut für Organische Chemie, Hagenring30, TU-Braunschweig, 38106 Braunschweig, Germany
| | - Giuseppe Licari
- Institut für Organische Chemie, Hagenring30, TU-Braunschweig, 38106 Braunschweig, Germany; Physical Chemistry Department, Sciences II, University of Geneva , 30, Quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland
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Mavridis I, Kythreoti G, Koltsida K, Vourloumis D. Rigid spiroethers targeting the decoding center of the bacterial ribosome. Bioorg Med Chem 2014; 22:1329-41. [PMID: 24457095 DOI: 10.1016/j.bmc.2013.12.068] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2013] [Revised: 12/30/2013] [Accepted: 12/30/2013] [Indexed: 01/21/2023]
Abstract
Continuing our efforts towards understanding the principles governing ribosomal recognition and function, we have synthesized and evaluated a series of diversely functionalized 5,6-, 6,6- and 7,6-spiroethers. These compounds successfully mimic natural aminoglycosides regarding their binding to the decoding center of the bacterial ribosome. Their potential to inhibit prokaryotic protein production in vitro along with their antibacterial potencies have also been examined.
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Affiliation(s)
- Ioannis Mavridis
- Chemical Biology Laboratories, National Center for Scientific Research 'Demokritos', Agia Paraskevi Attikis, GR-15310, Greece
| | - Georgia Kythreoti
- Chemical Biology Laboratories, National Center for Scientific Research 'Demokritos', Agia Paraskevi Attikis, GR-15310, Greece
| | - Konstantina Koltsida
- Chemical Biology Laboratories, National Center for Scientific Research 'Demokritos', Agia Paraskevi Attikis, GR-15310, Greece
| | - Dionisios Vourloumis
- Chemical Biology Laboratories, National Center for Scientific Research 'Demokritos', Agia Paraskevi Attikis, GR-15310, Greece.
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Synthesis of triazole-functionalized 2-DOS analogues and their evaluation as A-site binders. Bioorg Med Chem Lett 2014; 24:1122-6. [DOI: 10.1016/j.bmcl.2013.12.125] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Revised: 12/30/2013] [Accepted: 12/31/2013] [Indexed: 11/19/2022]
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Herndon JW. The chemistry of the carbon-transition metal double and triple bond: Annual survey covering the year 2011. Coord Chem Rev 2013. [DOI: 10.1016/j.ccr.2013.05.011] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Griffen JA, White JC, Kociok-Köhn G, Lloyd MD, Wells A, Arnot TC, Lewis SE. New aminocyclitols with quaternary stereocentres via acylnitroso cycloaddition with an ipso,ortho arene dihydrodiol. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.04.033] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Sancibrao P, Gori D, Kouklovsky C, Vincent G. Synthesis of oxaspirannic building blocks by regioselective nitroso-Diels-Alder reactions. Chemistry 2013; 19:5557-60. [PMID: 23508771 DOI: 10.1002/chem.201300195] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2013] [Indexed: 11/11/2022]
Abstract
Spirocyclic structures: Nitroso-Diels-Alder reactions of 1,3-disubstituted cyclohexadienes were found to be regiodivergent, depending on the nitroso derivative used. Cycloaddition with Wightman's chloronitroso derivative was totally regio- and stereoselective. This methodology was applied to the synthesis of heterospiranic frameworks after N-O bond cleavage and cyclization (see scheme; Boc=tert-butoxycarbonyl, Tf=trifluoromethanesulfonyl).
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Affiliation(s)
- Pierre Sancibrao
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université de Paris-Sud, Orsay, France
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McBurney RT, Eisenschmidt A, Slawin AMZ, Walton JC. Rapid and selective spiro-cyclisations of O-centred radicals onto aromatic acceptors. Chem Sci 2013. [DOI: 10.1039/c3sc50500f] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Gironés D, Hanckmann M, Rutjes FPJT, van Delft FL. 2′-Modified Neamine Analogues from Thiomannosides through Glycosidation-Stereoinversion. European J Org Chem 2012. [DOI: 10.1002/ejoc.201200084] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Fair RJ, Hensler ME, Thienphrapa W, Dam QN, Nizet V, Tor Y. Selectively guanidinylated aminoglycosides as antibiotics. ChemMedChem 2012; 7:1237-44. [PMID: 22639134 PMCID: PMC3383777 DOI: 10.1002/cmdc.201200150] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2012] [Indexed: 11/07/2022]
Abstract
The emergence of virulent, drug-resistant bacterial strains coupled with a minimal output of new pharmaceutical agents to combat them makes this a critical time for antibacterial research. Aminoglycosides are a well-studied, highly potent class of naturally occurring antibiotics with scaffolds amenable to modification, and therefore, they provide an excellent starting point for the development of semisynthetic, next-generation compounds. To explore the potential of this approach, we synthesized a small library of aminoglycoside derivatives selectively and minimally modified at one or two positions with a guanidine group replacing the corresponding amine or hydroxy functionality. Most guanidino-aminoglycosides showed increased affinity for the ribosomal decoding rRNA site, the cognate biological target of the natural products, when compared with their parent antibiotics, as measured by an in vitro fluorescence resonance energy transfer (FRET) A-site binding assay. Additionally, certain analogues showed improved minimum inhibitory concentration (MIC) values against resistant bacterial strains, including methicillin-resistant Staphylococcus aureus (MRSA). An amikacin derivative holds particular promise with activity greater than or equal to the parent antibiotic in the majority of bacterial strains tested.
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Affiliation(s)
- Richard J. Fair
- Department of Chemistry & Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093 (USA)
| | - Mary E. Hensler
- Department of Pediatrics, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093 (USA)
| | - Wdee Thienphrapa
- Department of Pediatrics, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093 (USA)
| | - Quang N. Dam
- Department of Pediatrics, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093 (USA)
| | - Victor Nizet
- Department of Pediatrics, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093 (USA)
| | - Yitzhak Tor
- Department of Chemistry & Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093 (USA)
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Katsoulis IA, Kythreoti G, Papakyriakou A, Koltsida K, Anastasopoulou P, Stathakis CI, Mavridis I, Cottin T, Saridakis E, Vourloumis D. Synthesis of 5,6-Spiroethers and Evaluation of their Affinities for the Bacterial A Site. Chembiochem 2011; 12:1188-92. [DOI: 10.1002/cbic.201100076] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2011] [Indexed: 11/06/2022]
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Kythreoti G, Vourloumis D. A Homo sapiens cytoplasmic ribosomal decoding A-site affinity screen evaluating aminoglycoside and analogue binding. Anal Biochem 2011; 412:102-7. [PMID: 21238425 DOI: 10.1016/j.ab.2011.01.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2010] [Accepted: 01/11/2011] [Indexed: 01/05/2023]
Abstract
The potential of aminoglycoside antibiotics to induce premature stop codon read-through in eukaryotic systems has been reported recently, inspiring the evaluation of structural alterations within the Homo sapiens cytoplasmic decoding center on ligand binding. Here we report the employment of an affinity screen capable of monitoring conformational changes of adenines 1492 and 1493 in solution. Thus, changes induced by the presence of a ligand can be directly translated to binding affinities for the eukaryotic decoding center. Binding data for the eukaryotic ribosomal decoding center can be easily obtained by this method and are in excellent agreement with previously reported values measured by alternative techniques. Furthermore, a good correlation is obtained between the experimental binding affinities and the biological activity of the compounds examined. In addition, illustrating the generality of the assay, unnatural rigid aminoglycoside analogues of potential therapeutic significance were evaluated.
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Affiliation(s)
- Georgia Kythreoti
- Institute of Physical Chemistry, Laboratory of Chemical Biology of Natural Products and Designed Molecules, NCSR Demokritos, 15310 Athens, Greece
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