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Rütter D, van Gastel M, Leutzsch M, Nöthling N, SantaLucia D, Neese F, Fürstner A. Molybdenum(VI) Nitrido Complexes with Tripodal Silanolate Ligands. Structure and Electronic Character of an Unsymmetrical Dimolybdenum μ-Nitrido Complex Formed by Incomplete Nitrogen Atom Transfer. Inorg Chem 2024; 63:8376-8389. [PMID: 38663089 PMCID: PMC11080062 DOI: 10.1021/acs.inorgchem.4c00762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2024] [Revised: 04/05/2024] [Accepted: 04/11/2024] [Indexed: 05/07/2024]
Abstract
In contrast to a tungsten nitrido complex endowed with a tripodal silanolate ligand framework, which was reported in the literature to be a dimeric species with a metallacyclic core, the corresponding molybdenum nitrides 3 are monomeric entities comprising a regular terminal nitride unit, as proven by single-crystal X-ray diffraction (SC-XRD). Their electronic character is largely determined by the constraints imposed on the metal center by the podand ligand architecture. 95Mo nuclear magnetic resonance (NMR) and, to a lesser extent, 14N NMR spectroscopy allow these effects to be studied, which become particularly apparent upon comparison with the spectral data of related molybdenum nitrides comprising unrestrained silanolate, alkoxide, or amide ligands. Attempted nitrogen atom transfer from these novel terminal nitrides to [(tBuArN)3Mo] (Ar = 3,5-dimethylphenyl) as the potential acceptor stopped at the stage of unsymmetric dimolybdenum μ-nitrido complex 13a as the first intermediate along the reaction pathway. SC-XRD, NMR, electron paramagnetic resonance, and ultraviolet-visible spectroscopy as well as magnetometry in combination with density functional theory allowed a clear picture of the geometric and electronic structure of this mixed-valent species to be drawn. 13a is formally best described as an adduct of the type [(Mo[O])+III-(μN)-III-(Mo[N])+VI], S = 1/2 complex with (Mo[O])+III in the low-spin configuration, whereas related complexes such as [(AdS)3Mo-(μN)-Mo(NtBuAr)3] (19; Ad = 1-adamantyl) have previously been regarded in the literature as mixed-valent Mo+IV/Mo+V species. The spin population at the two Mo centers is uneven and notably larger at the more reduced Mo[O] atom, whereas the only spin present at the (μN) bridge is derived from spin polarization.
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Affiliation(s)
- Daniel Rütter
- Max-Planck-Institut
für Kohlenforschung, 45470 Mülheim/Ruhr, Germany
| | | | - Markus Leutzsch
- Max-Planck-Institut
für Kohlenforschung, 45470 Mülheim/Ruhr, Germany
| | - Nils Nöthling
- Max-Planck-Institut
für Kohlenforschung, 45470 Mülheim/Ruhr, Germany
| | - Daniel SantaLucia
- Max-Planck-Institut
für Chemische Energiekonversion, 45470 Mülheim/Ruhr, Germany
| | - Frank Neese
- Max-Planck-Institut
für Kohlenforschung, 45470 Mülheim/Ruhr, Germany
| | - Alois Fürstner
- Max-Planck-Institut
für Kohlenforschung, 45470 Mülheim/Ruhr, Germany
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2
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Zachmann R, Yahata K, Holzheimer M, Jarret M, Wirtz C, Fürstner A. Total Syntheses of Nominal and Actual Prorocentin. J Am Chem Soc 2023; 145:2584-2595. [PMID: 36652728 PMCID: PMC9896551 DOI: 10.1021/jacs.2c12529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The dinoflagellate-derived polyether prorocentin is a co-metabolite of the archetypical serine/threonine phosphatase inhibitor okadaic acid. Whereas a structural relationship cannot be missed and a biosynthetic link was proposed, it is currently unknown whether there is any parallel in the bioactivity profile of these natural products. However, it was insinuated in the past that the structure assigned to prorocentin might need to be revised. Indeed, re-examination of the published spectra cast doubts as to the constitution of the fused/spirotricyclic BCD-ring system in the core. To clarify this issue, a flexible synthesis blueprint was devised that allowed us to obtain the originally proposed structure as well as the most plausible amended structure. The key to success was late-stage gold-catalyzed spirocyclization reactions that furnished the isomeric central segments with excellent selectivity. The lexicon of catalytic transformations used to make the required cyclization precursors comprised a titanium-mediated ester methylenation/metathesis cascade, a rare example of a gold-catalyzed allylic substitution, and chain extensions via organocatalytic asymmetric aldehyde propargylation. A wing sector to be attached to the isomeric cores was obtained by Krische allylation, followed by a superbly selective cobalt-catalyzed oxidative cyclization of the resulting di-unsaturated alcohol with the formation of a 2,5-trans-disubstituted tetrahydrofuran; the remaining terminal alkene was elaborated into an appropriate handle for fragment coupling by platinum-catalyzed asymmetric diboration/oxidation. The assembly of the different building blocks to the envisaged isomeric target compounds proved that the structure of prorocentin needs to be revised as disclosed herein.
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3
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Liu K, Sun Y, Cao M, Wang J, Lu JR, Xu H. Rational design, properties, and applications of biosurfactants: a short review of recent advances. Curr Opin Colloid Interface Sci 2020. [DOI: 10.1016/j.cocis.2019.12.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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4
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Delbeke EIP, Everaert J, Lozach O, Le Gall T, Berchel M, Montier T, Jaffrès PA, Rigole P, Coenye T, Brennich M, Baccile N, Roelants SLKW, Soetaert W, Van Bogaert INA, Van Geem KM, Stevens CV. Lipid-Based Quaternary Ammonium Sophorolipid Amphiphiles with Antimicrobial and Transfection Activities. CHEMSUSCHEM 2019; 12:3642-3653. [PMID: 31081279 DOI: 10.1002/cssc.201900721] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Revised: 05/09/2019] [Indexed: 06/09/2023]
Abstract
Twelve new quaternary ammonium sophorolipids with long alkyl chains on the nitrogen atom were synthesized starting from oleic and petroselinic acid-based sophorolipids. These novel derivatives were evaluated for their antimicrobial activity against selected Gram-negative and Gram-positive bacteria and their transfection efficacies on three different eukaryotic cell lines in vitro as good activities were demonstrated for previously synthesized derivatives. Self-assembly properties were also evaluated. All compounds proved to possess antimicrobial and transfection properties, and trends could be observed based on the length of the nitrogen substituent and the total length of the sophorolipid tail. Moreover, all long-chain quaternary ammonium sophorolipids form micelles, which proved to be a prerequisite to induce antimicrobial activity and transfection capacity. These results are promising for future healthcare applications of long-chained quaternary ammonium sophorolipids.
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Affiliation(s)
- Elisabeth I P Delbeke
- SynBioC, Department of Green Chemistry and Technology, Ghent University, Coupure Links 653, 9000, Ghent, Belgium
- LCT, Department of Materials, Textiles and Chemical Engineering, Ghent University, Technologiepark 125, 9052, Ghent, Belgium
| | - Jonas Everaert
- SynBioC, Department of Green Chemistry and Technology, Ghent University, Coupure Links 653, 9000, Ghent, Belgium
- InBio, Department of Biotechnology, Ghent University, Coupure Links 653, 9000, Ghent, Belgium
| | - Olivier Lozach
- CEMCA, CNRS UMR 6521, IBSAM, Université de Brest, 6 avenue le Gorgeu, 29238, Brest, France
| | - Tony Le Gall
- IBiSA SynNanoVect Platform, IBSAM, Faculté de médicine Morvan, Université de Brest, Avenue Camille Desmoulins, 46 rue Félix Le Dantec, CS 51819, 29219, Brest Cedex 2, France
- INSERM UMR 1078, IBSAM, Faculté de médecine Morvan, Université de Brest, Avenue Camille Desmoulins, 46 rue Félix Le Dantec, CS 51819, 29219, Brest Cedex 2, France
| | - Mathieu Berchel
- CEMCA, CNRS UMR 6521, IBSAM, Université de Brest, 6 avenue le Gorgeu, 29238, Brest, France
- IBiSA SynNanoVect Platform, IBSAM, Faculté de médicine Morvan, Université de Brest, Avenue Camille Desmoulins, 46 rue Félix Le Dantec, CS 51819, 29219, Brest Cedex 2, France
| | - Tristan Montier
- IBiSA SynNanoVect Platform, IBSAM, Faculté de médicine Morvan, Université de Brest, Avenue Camille Desmoulins, 46 rue Félix Le Dantec, CS 51819, 29219, Brest Cedex 2, France
- INSERM UMR 1078, IBSAM, Faculté de médecine Morvan, Université de Brest, Avenue Camille Desmoulins, 46 rue Félix Le Dantec, CS 51819, 29219, Brest Cedex 2, France
- CHRU de Brest, Service de Génétique Moléculaire et d'Histocompatibilité, 5 avenue Maréchal Foch, 29609, Brest Cedex, France
- DUMG, Faculté de Médecine et des Sciences de la Santé, 22 avenue Camille Desmoulins, 29328, Brest, France
| | - Paul-Alain Jaffrès
- CEMCA, CNRS UMR 6521, IBSAM, Université de Brest, 6 avenue le Gorgeu, 29238, Brest, France
- IBiSA SynNanoVect Platform, IBSAM, Faculté de médicine Morvan, Université de Brest, Avenue Camille Desmoulins, 46 rue Félix Le Dantec, CS 51819, 29219, Brest Cedex 2, France
| | - Petra Rigole
- Laboratory of Pharmaceutical Biotechnology, Ghent University, Ottergemsesteenweg 460, 9000, Ghent, Belgium
| | - Tom Coenye
- Laboratory of Pharmaceutical Biotechnology, Ghent University, Ottergemsesteenweg 460, 9000, Ghent, Belgium
| | - Martha Brennich
- Synchrotron Crystallography Group, European Molecular Biology Laboratory, 71 Avenue des Martyrs, 38042, Grenoble, France
- Institut Laue-Langevin, Grenoble, Beamline D16, Cedex 9, 38042, Grenoble, France
| | - Niki Baccile
- UPMC Univ Paris 06, CNRS, Collège de France, Laboratoire de Chimie de la Matière Condensée de Paris, Sorbonne Université, UMR 7574, 75005, Paris, France
| | - Sophie L K W Roelants
- InBio, Department of Biotechnology, Ghent University, Coupure Links 653, 9000, Ghent, Belgium
- Bio Base Europe Pilot Plant (BBEU), Rodenhuizenkaai 1, 9042, Ghent (Desteldonk), Belgium
| | - Wim Soetaert
- InBio, Department of Biotechnology, Ghent University, Coupure Links 653, 9000, Ghent, Belgium
- Bio Base Europe Pilot Plant (BBEU), Rodenhuizenkaai 1, 9042, Ghent (Desteldonk), Belgium
| | - Inge N A Van Bogaert
- Centre for Synthetic Biology, Department of Biotechnology, Ghent University, Coupure Links 653, 9000, Ghent, Belgium
| | - Kevin M Van Geem
- LCT, Department of Materials, Textiles and Chemical Engineering, Ghent University, Technologiepark 125, 9052, Ghent, Belgium
| | - Christian V Stevens
- SynBioC, Department of Green Chemistry and Technology, Ghent University, Coupure Links 653, 9000, Ghent, Belgium
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5
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Ehrhorn H, Tamm M. Well-Defined Alkyne Metathesis Catalysts: Developments and Recent Applications. Chemistry 2018; 25:3190-3208. [PMID: 30346054 DOI: 10.1002/chem.201804511] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Indexed: 12/31/2022]
Abstract
Although alkyne metathesis has been known for 50 years, rapid progress in this field has mostly occurred during the last two decades. In this article, the development of several highly efficient and thoroughly studied alkyne metathesis catalysts is reviewed, which includes novel well-defined, in situ formed and heterogeneous systems. Various alkyne metathesis methodologies, including alkyne cross-metathesis (ACM), ring-closing alkyne metathesis (RCAM), cyclooligomerization, acyclic diyne metathesis polymerization (ADIMET), and ring-opening alkyne metathesis polymerization (ROAMP), are presented, and their application in natural product synthesis, materials science as well as supramolecular and polymer chemistry is discussed. Recent progress in the metathesis of diynes is also summarized, which gave rise to new methods such as ring-closing diyne metathesis (RCDM) and diyne cross-metathesis (DYCM).
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Affiliation(s)
- Henrike Ehrhorn
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106, Braunschweig, Germany
| | - Matthias Tamm
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106, Braunschweig, Germany
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6
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Machara A, Křivánek J, Dolejšová K, Havlíčková J, Bednárová L, Hanus R, Majer P, Kyjaková P. Identification and Enantiodivergent Synthesis of (5 Z,9 S)-Tetradec-5-en-9-olide, a Queen-Specific Volatile of the Termite Silvestritermes minutus. JOURNAL OF NATURAL PRODUCTS 2018; 81:2266-2274. [PMID: 30299957 DOI: 10.1021/acs.jnatprod.8b00632] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The queens of social insects differ from sterile colony members in many aspects of their physiology. Besides adaptations linked with their specialization for reproduction and extended lifespan, the queens also invest in the maintenance of their reproductive dominance by producing exocrine chemicals signaling their presence to the nestmates. The knowledge of the chemistry of queen-specific cues in termites is scarce. In addition to the contact recognition based on cuticular hydrocarbons, long-range signals mediated by volatiles are expected to participate in queen signaling, especially in populous colonies of higher termites (Termitidae). In queens of the higher termite Silvestritermes minutus (Syntermitinae), we have detected a previously undescribed volatile. It is present in important quantities on the body surface and in the headspace, ovaries, and body cavity. MS and GC-FTIR data analyses led us to propose the structure of the compound to be a macrolide 10-pentyl-3,4,5,8,9,10-hexahydro-2 H-oxecin-2-one. We performed enantiodivergent syntheses of two possible enantiomers starting from enantiopure ( S)-glycidyl tosylate. The synthetic sequence involved macrolide-closing metathesis quenched with a ruthenium scavenging agent. The absolute and relative configuration of the compound was assigned to be (5 Z,9 S)-tetradec-5-en-9-olide. Identification and preparation of the compound allow for investigation of its biological significance.
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Affiliation(s)
- Aleš Machara
- Institute of Organic Chemistry and Biochemistry of the CAS , Flemingovo n. 542/2 , 166 10 , Prague 6 , Czech Republic
| | - Jan Křivánek
- Institute of Organic Chemistry and Biochemistry of the CAS , Flemingovo n. 542/2 , 166 10 , Prague 6 , Czech Republic
| | - Klára Dolejšová
- Institute of Organic Chemistry and Biochemistry of the CAS , Flemingovo n. 542/2 , 166 10 , Prague 6 , Czech Republic
| | - Jana Havlíčková
- Institute of Organic Chemistry and Biochemistry of the CAS , Flemingovo n. 542/2 , 166 10 , Prague 6 , Czech Republic
| | - Lucie Bednárová
- Institute of Organic Chemistry and Biochemistry of the CAS , Flemingovo n. 542/2 , 166 10 , Prague 6 , Czech Republic
| | - Robert Hanus
- Institute of Organic Chemistry and Biochemistry of the CAS , Flemingovo n. 542/2 , 166 10 , Prague 6 , Czech Republic
| | - Pavel Majer
- Institute of Organic Chemistry and Biochemistry of the CAS , Flemingovo n. 542/2 , 166 10 , Prague 6 , Czech Republic
| | - Pavlína Kyjaková
- Institute of Organic Chemistry and Biochemistry of the CAS , Flemingovo n. 542/2 , 166 10 , Prague 6 , Czech Republic
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7
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Roudias M, Vallée F, Martel J, Paquin JF. Use of XtalFluor-E as an Alternative to POCl 3 in the Vilsmeier-Haack Formylation of C-2-Glycals. J Org Chem 2018; 83:8731-8738. [PMID: 29989816 DOI: 10.1021/acs.joc.8b01006] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
We report the use of XtalFluor-E ([Et2NSF2]BF4) as an alternative to POCl3 in the Vilsmeier-Haack formylation reaction of C-2-glycals. Employing a XtalFluor-E/DMF combination allowed the desired C-2-formyl glycals to be isolated in 11-90% yield. This method was extended to the synthesis of a C-2 -formylated disaccharide glycal.
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Affiliation(s)
- Majdouline Roudias
- CCVC, PROTEO, Département de chimie , Université Laval , 1045 avenue de la Médecine , Québec , QC , Canada G1V 0A6
| | - Frédéric Vallée
- OmegaChem Inc. , 480 rue Perreault , Lévis , QC , Canada G6W 7V6
| | - Julien Martel
- OmegaChem Inc. , 480 rue Perreault , Lévis , QC , Canada G6W 7V6
| | - Jean-François Paquin
- CCVC, PROTEO, Département de chimie , Université Laval , 1045 avenue de la Médecine , Québec , QC , Canada G1V 0A6
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8
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Mo X, Letort A, Roşca DA, Higashida K, Fürstner A. Site-Selectivetrans-Hydrostannation of 1,3- and 1,n-Diynes: Application to the Total Synthesis of Typhonosides E and F, and a Fluorinated Cerebroside Analogue. Chemistry 2018; 24:9667-9674. [DOI: 10.1002/chem.201801344] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Indexed: 12/16/2022]
Affiliation(s)
- Xiaobin Mo
- Max-Planck-Institut für Kohlenforschung; 45470 Mülheim/Ruhr Germany
| | - Aurélien Letort
- Max-Planck-Institut für Kohlenforschung; 45470 Mülheim/Ruhr Germany
| | | | - Kosuke Higashida
- Max-Planck-Institut für Kohlenforschung; 45470 Mülheim/Ruhr Germany
| | - Alois Fürstner
- Max-Planck-Institut für Kohlenforschung; 45470 Mülheim/Ruhr Germany
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9
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Hauser PM, Hunger M, Buchmeiser MR. Silica-Supported Molybdenum Alkylidyne N-Heterocyclic Carbene Catalysts: Relevance of Site Isolation to Catalytic Performance. ChemCatChem 2018. [DOI: 10.1002/cctc.201701654] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Philipp M. Hauser
- Institute of Polymer Chemistry; University of Stuttgart; Pfaffenwaldring 55 D-70569 Stuttgart Germany
| | - Michael Hunger
- Institute of Chemical Technology; University of Stuttgart; Pfaffenwaldring 55 D-70569 Stuttgart Germany
| | - Michael R. Buchmeiser
- Institute of Polymer Chemistry; University of Stuttgart; Pfaffenwaldring 55 D-70569 Stuttgart Germany
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10
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Fürstner A. Gold-Katalyse für die Heterocyclenchemie: eine repräsentative Fallstudie zu Naturstoffen der Pyron-Reihe. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201707260] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Alois Fürstner
- Max-Planck-Institut für Kohlenforschung; 45470 Mülheim/Ruhr Deutschland
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11
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Fürstner A. Gold Catalysis for Heterocyclic Chemistry: A Representative Case Study on Pyrone Natural Products. Angew Chem Int Ed Engl 2017; 57:4215-4233. [PMID: 28862364 DOI: 10.1002/anie.201707260] [Citation(s) in RCA: 113] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Indexed: 11/06/2022]
Abstract
2-Pyrones and 4-pyrones are common structural motifs in bioactive natural products. However, traditional methods for their synthesis, which try to emulate the biosynthetic pathway of cyclization of a 1,3,5-tricarbonyl precursor, are often harsh and, therefore, not particularly suitable for applications to polyfunctionalized and/or sensitive target compounds. π-Acid catalysis, in contrast, has proved to be better for a systematic exploration of the pyrone estate. To this end, alkynes are used as stable ketone surrogates, which can be activated under exceedingly mild conditions due to the pronounced carbophilicity of [LAu]+ fragments (L=two electron donor ligand); attack of a tethered ester carbonyl group onto the transient alkyne-gold complex then forges the pyrone ring in a fully regiocontrolled manner.
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Affiliation(s)
- Alois Fürstner
- Max-Planck-Institut für Kohlenforschung, 45470, Mülheim/Ruhr, Germany
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12
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Jana S, Mondal S, Kulkarni SS. Chemical Synthesis of Biosurfactant Succinoyl Trehalose Lipids. Org Lett 2017; 19:1784-1787. [DOI: 10.1021/acs.orglett.7b00550] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Santanu Jana
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India
| | - Sumana Mondal
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India
| | - Suvarn S. Kulkarni
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India
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13
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Synthesis of an allergy inducing tetrasaccharide “4P-X”. Carbohydr Res 2017; 439:44-49. [DOI: 10.1016/j.carres.2016.11.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Revised: 11/23/2016] [Accepted: 11/23/2016] [Indexed: 12/26/2022]
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14
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Yashunsky DV, Tsvetkov YE, Nifantiev NE. Synthesis of 3-aminopropyl glycosides of branched β-(1→3)-glucooligosaccharides. Russ Chem Bull 2016. [DOI: 10.1007/s11172-015-1249-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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15
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Si D, Peczuh MW. Synthesis and structure of a carbohydrate-fused [15]-macrodilactone. Carbohydr Res 2016; 434:113-120. [PMID: 27639337 DOI: 10.1016/j.carres.2016.08.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Revised: 08/24/2016] [Accepted: 08/26/2016] [Indexed: 10/21/2022]
Abstract
The design, synthesis and structural characterization of a new α-d-glucose fused [15]-macrodilactone is reported. The macrolide was synthesized by a route involving sequential acylations of glucose at the C4' and C6' hydroxyl groups followed by an intramolecular Stille reaction previously established for other [15]-macrodilactones. Analysis of the X-ray crystallographic structure of the macrolide revealed a unique conformation of this macrocycle that differs from earlier models for [13]- and [15]-macrodilactones. Organizing the three planar units and the pyranose moiety into a macrocyclic ring resulted in a cup-shaped structure with planar chirality. Further, the gt conformation of the exocyclic hydroxymethyl group in the glucose unit was found to be crucial for controlling the planar chirality and, hence, governing the molecular shape and overall topology of the compound.
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Affiliation(s)
- Debjani Si
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road, U3060, Storrs, CT 06269, USA
| | - Mark W Peczuh
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road, U3060, Storrs, CT 06269, USA.
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16
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Sun L, Wu X, Xiong DC, Ye XS. Stereoselective Koenigs-Knorr Glycosylation Catalyzed by Urea. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201600142] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Lifeng Sun
- State Key Laboratory of Natural and Biomimetic Drugs; School of Pharmaceutical Sciences; Peking University; Xue Yuan Road No. 38 Beijing 100191 China
| | - Xiaowei Wu
- State Key Laboratory of Natural and Biomimetic Drugs; School of Pharmaceutical Sciences; Peking University; Xue Yuan Road No. 38 Beijing 100191 China
| | - De-Cai Xiong
- State Key Laboratory of Natural and Biomimetic Drugs; School of Pharmaceutical Sciences; Peking University; Xue Yuan Road No. 38 Beijing 100191 China
| | - Xin-Shan Ye
- State Key Laboratory of Natural and Biomimetic Drugs; School of Pharmaceutical Sciences; Peking University; Xue Yuan Road No. 38 Beijing 100191 China
- National Engineering Research Center for Carbohydrate Synthesis; Jiangxi Normal University; Nanchang 330022 Jiangxi China
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17
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Sun L, Wu X, Xiong DC, Ye XS. Stereoselective Koenigs-Knorr Glycosylation Catalyzed by Urea. Angew Chem Int Ed Engl 2016; 55:8041-4. [PMID: 27244701 DOI: 10.1002/anie.201600142] [Citation(s) in RCA: 84] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2016] [Revised: 04/08/2016] [Indexed: 11/05/2022]
Abstract
A stereoselective Koenigs-Knorr glycosylation reaction under the catalysis of urea is described. This method is characterized by urea-mediated hydrogen-bond activation and subsequent glycosylation with glycosyl chlorides or bromides. Excellent yields and high anomeric selectivity can be achieved in most cases. Moreover, the low α-stereoselectivity of glycosylations observed when using perbenzylated glucosyl donors can be greatly improved by the addition of tri-(2,4,6-trimethoxyphenyl)phosphine (TTMPP).
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Affiliation(s)
- Lifeng Sun
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Xue Yuan Road No. 38, Beijing, 100191, China
| | - Xiaowei Wu
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Xue Yuan Road No. 38, Beijing, 100191, China
| | - De-Cai Xiong
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Xue Yuan Road No. 38, Beijing, 100191, China
| | - Xin-Shan Ye
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Xue Yuan Road No. 38, Beijing, 100191, China. .,National Engineering Research Center for Carbohydrate Synthesis, Jiangxi Normal University, Nanchang, 330022, Jiangxi, China.
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Schaubach S, Gebauer K, Ungeheuer F, Hoffmeister L, Ilg MK, Wirtz C, Fürstner A. A Two-Component Alkyne Metathesis Catalyst System with an Improved Substrate Scope and Functional Group Tolerance: Development and Applications to Natural Product Synthesis. Chemistry 2016; 22:8494-507. [DOI: 10.1002/chem.201601163] [Citation(s) in RCA: 76] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Indexed: 01/02/2023]
Affiliation(s)
| | - Konrad Gebauer
- Max-Planck-Institut für Kohlenforschung; 45470 Mülheim/Ruhr Germany
| | - Felix Ungeheuer
- Max-Planck-Institut für Kohlenforschung; 45470 Mülheim/Ruhr Germany
| | | | - Marina K. Ilg
- Max-Planck-Institut für Kohlenforschung; 45470 Mülheim/Ruhr Germany
| | - Conny Wirtz
- Max-Planck-Institut für Kohlenforschung; 45470 Mülheim/Ruhr Germany
| | - Alois Fürstner
- Max-Planck-Institut für Kohlenforschung; 45470 Mülheim/Ruhr Germany
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19
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Frihed TG, Fürstner A. Progress in the trans-Reduction and trans-Hydrometalation of Internal Alkynes. Applications to Natural Product Synthesis. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2016. [DOI: 10.1246/bcsj.20150317] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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20
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Nakagawa A, Tanaka M, Hanamura S, Takahashi D, Toshima K. Regioselective and 1,2-cis-α-Stereoselective Glycosylation Utilizing Glycosyl-Acceptor-Derived Boronic Ester Catalyst. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/anie.201504182] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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21
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Nakagawa A, Tanaka M, Hanamura S, Takahashi D, Toshima K. Regioselective and 1,2-cis-α-Stereoselective Glycosylation Utilizing Glycosyl-Acceptor-Derived Boronic Ester Catalyst. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201504182] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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22
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Varvaresou A, Iakovou K. Biosurfactants in cosmetics and biopharmaceuticals. Lett Appl Microbiol 2015; 61:214-23. [PMID: 25970073 DOI: 10.1111/lam.12440] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Revised: 04/23/2015] [Accepted: 04/25/2015] [Indexed: 11/28/2022]
Abstract
Biosurfactants are surface-active biomolecules that are produced by various micro-organisms. They show unique properties i.e. lower toxicity, higher biodegradability and environmental compatibility compared to their chemical counterparts. Glycolipids and lipopeptides have prompted application in biotechnology and cosmetics due to their multi-functional profile i.e. detergency, emulsifying, foaming and skin hydrating properties. Additionally, some of them can be served as antimicrobials. In this study the current status of research and development on rhamnolipids, sophorolipids, mannosyloerythritol lipids, trehalipids, xylolipids and lipopeptides particularly their commercial application in cosmetics and biopharmaceuticals, is described.
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Affiliation(s)
- A Varvaresou
- Laboratory of Cosmetology, Department of Aesthetics and Cosmetology, Technological Educational Institution of Athens, Athens, Greece
| | - K Iakovou
- Department of Drugs, Ministry of Health, Athens, Greece
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23
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Valot G, Mailhol D, Regens CS, O'Malley DP, Godineau E, Takikawa H, Philipps P, Fürstner A. Concise Total Syntheses of Amphidinolides C and F. Chemistry 2014; 21:2398-408. [DOI: 10.1002/chem.201405790] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Indexed: 01/23/2023]
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24
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Desmond RT, Magpusao AN, Lorenc C, Alverson JB, Priestley N, Peczuh MW. De novo macrolide-glycolipid macrolactone hybrids: Synthesis, structure and antibiotic activity of carbohydrate-fused macrocycles. Beilstein J Org Chem 2014; 10:2215-21. [PMID: 25246980 PMCID: PMC4168945 DOI: 10.3762/bjoc.10.229] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Accepted: 08/29/2014] [Indexed: 01/17/2023] Open
Abstract
Natural product-like macrocycles were designed as potential antibacterial compounds. The macrocycles featured a D-glucose unit fused into a 12- or 13-member macrolactone. The rings are connected via the C6' and anomeric (C1') positions of the monosaccharide. The new macrocycles/macrolides were characterized by X-ray crystallography. Their structures showed that, in addition to the ester and alkene units, the dihedral angle about the glycosidic linkage (exo-anomeric effect) influenced the overall shape of the molecules. Glycosylation of an available hydroxy group on the macrocycle gave a hybrid macrolide with features common to erythromycin and sophorlipid macrolactone. Weak antibiotic activity (MICs <100 μg/mL) was observed for several of the compounds.
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Affiliation(s)
- Richard T Desmond
- Department of Chemistry, University of Connecticut, 55 N. Eagleville Road, U3060, Storrs, CT 06269, USA, +1-860-486-1605 FAX: +1-860-486-2981
| | - Anniefer N Magpusao
- Department of Chemistry, University of Connecticut, 55 N. Eagleville Road, U3060, Storrs, CT 06269, USA, +1-860-486-1605 FAX: +1-860-486-2981
| | - Chris Lorenc
- Department of Chemistry, University of Connecticut, 55 N. Eagleville Road, U3060, Storrs, CT 06269, USA, +1-860-486-1605 FAX: +1-860-486-2981
| | - Jeremy B Alverson
- Department of Chemistry and Biochemistry, University of Montana, Missoula, MT 59812, USA
| | - Nigel Priestley
- Department of Chemistry and Biochemistry, University of Montana, Missoula, MT 59812, USA
| | - Mark W Peczuh
- Department of Chemistry, University of Connecticut, 55 N. Eagleville Road, U3060, Storrs, CT 06269, USA, +1-860-486-1605 FAX: +1-860-486-2981
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25
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Geng Y, Faidallah HM, Albar HA, Mhkalid IA, Schmidt RR. Organocatalysis for the Acid-FreeO-Arylidenation of Carbohydrates. European J Org Chem 2013. [DOI: 10.1002/ejoc.201301116] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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26
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Hsieh HW, Schombs MW, Witschi MA, Gervay-Hague J. Regioselective silyl/acetate exchange of disaccharides yields advanced glycosyl donor and acceptor precursors. J Org Chem 2013; 78:9677-88. [PMID: 23980653 DOI: 10.1021/jo4013805] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Glycoconjugates are composed of carbohydrate building blocks linked together in a multitude of ways giving rise to diverse biological functions. Carbohydrates are especially difficult to synthetically manipulate because of the similar reactivity of their numerous and largely equivalent hydroxyl groups. Hence, methodologies for both the efficient protection and selective modification of carbohydrate alcohols are considered important synthetic tools in organic chemistry. When per-O-TMS protected mono- or disaccharides in a mixture of pyridine and acetic anhydride are treated with acetic acid, regioselective exchange of silicon for acetate protecting groups occurs. Acid concentration, thermal conditions, and microwave assistance mediate the silyl/acetate exchange reaction. Regiocontrol is achieved by limiting the equivalents of acetic acid, and microwave irradiation hastens the process. We coined the term Regioselective Silyl Exchange Technology (ReSET) to describe this process, which essentially sets the protecting groups anew. To demonstrate the scope of the reaction, the conditions were applied to lactose, melibiose, cellobiose, and trehalose. ReSET provided rapid access to a wide range of orthogonally protected disaccharides that would otherwise require multiple synthetic steps to acquire. The resulting bifunctional molecules are poised to serve as modular building blocks for more complex glycoconjugates.
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Affiliation(s)
- Hsiao-Wu Hsieh
- Department of Chemistry, University of California at Davis , One Shields Avenue, Davis, California 95616, United States
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27
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Kondoh A, Arlt A, Gabor B, Fürstner A. Total synthesis of nominal gobienine A. Chemistry 2013; 19:7731-8. [PMID: 23589394 DOI: 10.1002/chem.201300827] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2013] [Indexed: 11/10/2022]
Abstract
The lichen-derived glycoconjugate gobienine A is structurally more complex than most glycolipids isolated from higher plants by virtue of the all-cis substituted γ-lactone substructure embedded into its macrocyclic frame. A concise entry into this very epimerization-prone and hence challenging structural motif is presented, which relies on an enantioselective cyanohydrin formation, an intramolecular Blaise reaction, a palladium-catalyzed alkoxycarbonylation, and a diastereoselective hydrogenation of the tetrasubstituted alkene in the resulting butenolide. This strategy, in combination with ring-closing olefin metathesis for the formation of the macrocyclic perimeter, allowed the proposed structure of gobienine A (1) to be formed in high overall yield. The recorded spectral data show that the structure originally attributed to gobienine A is incorrect and that it is not the epimerization-prone ester site on the butanolide ring that is the locus of misassignment; rather, the discrepancy must be more profound.
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Affiliation(s)
- Azusa Kondoh
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr, Germany
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28
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29
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30
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Heppekausen J, Stade R, Kondoh A, Seidel G, Goddard R, Fürstner A. Optimized Synthesis, Structural Investigations, Ligand Tuning and Synthetic Evaluation of Silyloxy-Based Alkyne Metathesis Catalysts. Chemistry 2012; 18:10281-99. [DOI: 10.1002/chem.201200621] [Citation(s) in RCA: 170] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2012] [Indexed: 01/17/2023]
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31
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Hoffmann N, Pietruszka J, Söffing C. From Sophorose Lipids to Natural Product Synthesis. Adv Synth Catal 2012. [DOI: 10.1002/adsc.201101005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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32
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Lehr K, Mariz R, Leseurre L, Gabor B, Fürstner A. Total Synthesis of Tulearin C. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201106117] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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33
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Lehr K, Mariz R, Leseurre L, Gabor B, Fürstner A. Total Synthesis of Tulearin C. Angew Chem Int Ed Engl 2011; 50:11373-7. [DOI: 10.1002/anie.201106117] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2011] [Indexed: 01/17/2023]
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34
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Second-Generation Total Synthesis of Spirastrellolide F Methyl Ester: The Alkyne Route. Angew Chem Int Ed Engl 2011; 50:8739-44. [DOI: 10.1002/anie.201103270] [Citation(s) in RCA: 114] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2011] [Indexed: 12/17/2022]
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35
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Benson S, Collin MP, Arlt A, Gabor B, Goddard R, Fürstner A. Second-Generation Total Synthesis of Spirastrellolide F Methyl Ester: The Alkyne Route. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201103270] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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36
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Reddy YS, John Pal AP, Gupta P, Ansari AA, Vankar YD. Ceric Ammonium Nitrate-Catalyzed Azidation of 1,2-Anhydro Sugars: Application in the Synthesis of Structurally Diverse Sugar-Derived Morpholine 1,2,3-Triazoles and 1,4-Oxazin-2-ones. J Org Chem 2011; 76:5972-84. [DOI: 10.1021/jo200260w] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Y. Suman Reddy
- Department of Chemistry, Indian Institute of Technology, Kanpur −208 016, India
| | - A. P. John Pal
- Department of Chemistry, Indian Institute of Technology, Kanpur −208 016, India
| | - Preeti Gupta
- Department of Chemistry, Indian Institute of Technology, Kanpur −208 016, India
| | - Alafia A. Ansari
- Department of Chemistry, Indian Institute of Technology, Kanpur −208 016, India
| | - Yashwant D. Vankar
- Department of Chemistry, Indian Institute of Technology, Kanpur −208 016, India
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37
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Wiedner ES, Gallagher KJ, Johnson MJA, Kampf JW. Synthesis of molybdenum nitrido complexes for triple-bond metathesis of alkynes and nitriles. Inorg Chem 2011; 50:5936-45. [PMID: 21630685 DOI: 10.1021/ic1024247] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Complexes of the type N≡Mo(OR)(3) (R = tertiary alkyl, tertiary silyl, bulky aryl) have been synthesized in the search for molybdenum-based nitrile-alkyne cross-metathesis (NACM) catalysts. Protonolysis of known N≡Mo(NMe(2))(3) led to the formation of N≡Mo(O-2,6-(i)Pr(2)C(6)H(3))(3)(NHMe(2)) (12), N≡Mo(OSiPh(3))(3)(NHMe(2)) (5-NHMe(2)), and N≡Mo(OCPh(2)Me)(3)(NHMe(2)) (17-NHMe(2)). The X-ray structure of 12 revealed an NHMe(2) ligand bound cis to the nitrido ligand, while 5-NHMe(2) possessed an NHMe(2) bound trans to the nitride ligand. Consequently, 17-NHMe(2) readily lost its amine ligand to form N≡Mo(OCPh(2)Me)(3) (17), while 12 and 5-NHMe(2) retained their amine ligands in solution. Starting from bulkier tris-anilide complexes, N≡Mo(N[R]Ar)(3) (R = isopropyl, tert-butyl; Ar = 3,5-dimethylphenyl) allowed for the formation of base-free complexes N≡Mo(OSiPh(3))(3) (5) and N≡Mo(OSiPh(2)(t)Bu)(3) (16). Achievement of a NACM cycle requires the nitride complex to react with alkynes to form alkylidyne complexes; therefore the alkyne cross-metathesis (ACM) activity of the complexes was tested. Complex 5 was found to be an efficient catalyst for the ACM of 1-phenyl-1-butyne at room temperature. Complexes 12 and 5-NHMe(2) were also active for ACM at 75 °C, while 17-NHMe(2) and 16 did not show ACM activity. Only 5 proved to be active for the NACM of anisonitrile, which is a reactive substrate in NACM catalyzed by tungsten. NACM with 5 required a reaction temperature of 180 °C in order to initiate the requisite alkylidyne-to-nitride conversion, with slightly more than two turnovers achieved prior to catalyst deactivation. Known molybdenum nitrido complexes were screened for NACM activity under similar conditions, and only N≡Mo(OSiPh(3))(3)(py) (5-py) displayed any trace of NACM activity.
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Affiliation(s)
- Eric S Wiedner
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109-1055, USA
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38
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Affiliation(s)
- Joëlle Prunet
- WestCHEM, Department of Chemistry, University of Glasgow, Joseph Black Building, University Avenue, Glasgow G12 8QQ, UK, Fax: +44‐141‐330‐4888
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39
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López JC, Plumet J. Metathesis Reactions of Carbohydrates: Recent Highlights in Alkyne Metathesis. European J Org Chem 2011. [DOI: 10.1002/ejoc.201001518] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- J. Cristóbal López
- Instituto de Química Orgánica General, CSIC, Juan de la Cierva 3, 28006 Madrid, Spain
| | - Joaquín Plumet
- Universidad Complutense, Facultad de Química, Departamento de Química Orgánica, Ciudad Universitaria s/n, 28040 Madrid, Spain, Fax: +34‐91‐394‐4103
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40
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An efficient one-pot synthesis of β-enamino ketones from endo glucal via hypervalent iodine. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.09.019] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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41
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Heppekausen J, Stade R, Goddard R, Fürstner A. Practical New Silyloxy-Based Alkyne Metathesis Catalysts with Optimized Activity and Selectivity Profiles. J Am Chem Soc 2010; 132:11045-57. [DOI: 10.1021/ja104800w] [Citation(s) in RCA: 258] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
| | - Robert Stade
- Max-Planck-Institut für Kohlenforschung, D-45470 Mülheim/Ruhr, Germany
| | - Richard Goddard
- Max-Planck-Institut für Kohlenforschung, D-45470 Mülheim/Ruhr, Germany
| | - Alois Fürstner
- Max-Planck-Institut für Kohlenforschung, D-45470 Mülheim/Ruhr, Germany
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42
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Affiliation(s)
| | - Paul V. Murphy
- School of Chemistry, National University of Ireland, Galway, Ireland, Fax: +353‐91‐525700
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43
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Nagano T, Pospísil J, Chollet G, Schulthoff S, Hickmann V, Moulin E, Herrmann J, Müller R, Fürstner A. Total synthesis and biological evaluation of the cytotoxic resin glycosides ipomoeassin A-F and analogues. Chemistry 2010; 15:9697-706. [PMID: 19697385 DOI: 10.1002/chem.200901449] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
A multitasking C-silylation strategy using the readily available compound 26 as a surrogate for cinnamic acid represents the key design element of a total synthesis of all known members of the ipomoeassin family of resin glyosides. This protecting group maneuver allows the unsaturated acids decorating the glucose subunit of the targets to be attached at an early phase of the synthesis, prevents their participation in the ruthenium-catalyzed ring-closing metathesis (RCM) used to form the macrocyclic ring, and protects them against reduction during the hydrogenation of the resulting cycloalkene over Wilkinson's catalyst. As the C-silyl group can be concomitantly removed with the O-TBS substituent using tris(dimethylamino)sulfonium difluorotrimethylsilicate (TASF) in acetonitrile, no separate protecting group manipulations were necessary in the final stages, thus contributing to a favorable overall "economy of steps". In addition to the naturally occurring ipomoeassins, a small set of synthetic analogues has also been prepared by "diverted total synthesis". The cytotoxicity of these compounds was assayed with two different cancer cell lines. The recorded data confirm previous findings that the acylation- and oxygenation pattern of these amphiphilic glycoconjugates is highly correlated with their biological activity profile. Ipomoeassin F turned out to be the most promising member of the series, showing IC(50) values in the low nanomolar range.
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Affiliation(s)
- Takashi Nagano
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr, Germany
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44
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Bindl M, Jean L, Herrmann J, Müller R, Fürstner A. Preparation, Modification, and Evaluation of Cruentaren A and Analogues. Chemistry 2009; 15:12310-9. [DOI: 10.1002/chem.200901817] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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45
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Fürstner A, Flügge S, Larionov O, Takahashi Y, Kubota T, Kobayashi J. Total synthesis and biological evaluation of amphidinolide V and analogues. Chemistry 2009; 15:4011-29. [PMID: 19241434 DOI: 10.1002/chem.200802068] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The awesome power of metathesis is illustrated by a concise synthesis of the extremely scarce marine natural product amphidinolide V, which hinges on a sequence of ring-closing alkyne metathesis followed by intermolecular enyne metathesis with ethylene (see scheme). As a complete set of conceivable stereoisomers was prepared, the constitution and absolute configuration of this macrolide could be established and first insights into structure-activity relationships governing its cytotoxicity were obtained.A sequence of ring-closing alkyne metathesis followed by an intermolecular enyne metathesis of the resulting cycloalkyne with ethene was used to forge the macrocyclic skeleton and to set the vicinal exo-methylene branches characteristic for the cytotoxic marine natural product amphidinolide V (1). Comparison of the synthetic material with an authentic sample of this extremely scarce metabolite isolated from a dinoflagellate of the Amphidinium sp. eliminated any doubts about its structure and allowed the absolute configuration of amphidinolide V to be determined as 8R,9S,10S,13R. Moreover, the flexibility inherent to the underlying synthesis blueprint also opened access to a comprehensive set of diastereomers of 1 as well as to synthetic analogues differing from the natural lead in the lipophilic chains appended to the macrocyclic core. This set of designed analogues gave first insights into structure-activity relationships, which revealed that the stereostructure of the macrolactone is a highly critical parameter, whereas the examined alterations of the side chain did not diminish the cytotoxicity of the compounds to any notable extent.
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Affiliation(s)
- Alois Fürstner
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr, Germany
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46
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Mathew T, Billaud C, Billich A, Cavallari M, Nussbaumer P, De Libero G, Vasella A. Synthesis of 7-Aza- and 7-Thiasphingosines, and Evaluation of Their Interaction with Sphingosine Kinases and with T-Cells. Chem Biodivers 2009; 6:725-38. [DOI: 10.1002/cbdv.200900039] [Citation(s) in RCA: 2] [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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47
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Doyle D, Murphy PV. Synthesis of novel glycophanes derived from glucuronic acid by ring closing alkene and alkyne metathesis. Carbohydr Res 2008; 343:2535-44. [DOI: 10.1016/j.carres.2008.06.007] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2008] [Revised: 05/30/2008] [Accepted: 06/07/2008] [Indexed: 11/17/2022]
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48
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Bobula T, Hudlický J, Novák P, Gyepes R, Císařová I, Štěpnička P, Kotora M. Mo-Catalyzed Cross-Metathesis Reaction of Propynylferrocene. Eur J Inorg Chem 2008. [DOI: 10.1002/ejic.200800128] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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49
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Bhattacharyya S, Sangita, Zaleski JM. Unique Metal-Diyne, -Enyne, and -Enediyne Complexes: Part of the Remarkably Diverse World of Metal-Alkyne Chemistry. PROGRESS IN INORGANIC CHEMISTRY 2008. [DOI: 10.1002/9780470144428.ch6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
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50
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Fürstner A, Bindl M, Jean L. Concise Total Synthesis of Cruentaren A. Angew Chem Int Ed Engl 2007; 46:9275-8. [DOI: 10.1002/anie.200703839] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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