1
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Ma W, Schmidt A, Strohmann C, Loh CCJ. Stereoselective Entry into α,α'-C-Oxepane Scaffolds through a Chalcogen Bonding Catalyzed Strain-Release C-Septanosylation Strategy. Angew Chem Int Ed Engl 2024; 63:e202405706. [PMID: 38687567 DOI: 10.1002/anie.202405706] [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: 03/24/2024] [Revised: 04/28/2024] [Accepted: 04/29/2024] [Indexed: 05/02/2024]
Abstract
The utility of unconventional noncovalent interactions (NCIs) such as chalcogen bonding has lately emerged as a robust platform to access synthetically difficult glycosides stereoselectively. Herein, we disclose the versatility of a phosphonochalcogenide (PCH) catalyst to facilitate access into the challenging, but biologically interesting 7-membered ring α,α'-C-disubstituted oxepane core through an α-selective strain-release C-glycosylation. Methodically, this strategy represents a switch from more common but entropically less desired macrocyclizations to a thermodynamically favored ring-expansion approach. In light of the general lack of stereoselective methods to access C-septanosides, a remarkable palette of silyl-based nucleophiles can be reliably employed in our method. This include a broad variety of useful synthons, such as easily available silyl-allyl, silyl-enol ether, silyl-ketene acetal, vinylogous silyl-ketene acetal, silyl-alkyne and silylazide reagents. Mechanistic investigations suggest that a mechanistic shift towards an intramolecular aglycone transposition involving a pentacoordinate silicon intermediate is likely responsible in steering the stereoselectivity.
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Affiliation(s)
- Wenpeng Ma
- Abteilung Chemische Biologie, Max Planck Institut für Molekulare Physiologie, Otto-Hahn-Straße 11, 44227, Dortmund, Germany
- Fakultät für Chemie und Chemische Biologie, Technische Universität Dortmund, Otto-Hahn-Straße 4a, 44227, Dortmund, Germany
| | - Annika Schmidt
- Fakultät für Chemie und Chemische Biologie, Anorganische Chemie, Technische Universität Dortmund, Otto-Hahn-Straße 6, 44227, Dortmund, Germany
| | - Carsten Strohmann
- Fakultät für Chemie und Chemische Biologie, Anorganische Chemie, Technische Universität Dortmund, Otto-Hahn-Straße 6, 44227, Dortmund, Germany
| | - Charles C J Loh
- Abteilung Chemische Biologie, Max Planck Institut für Molekulare Physiologie, Otto-Hahn-Straße 11, 44227, Dortmund, Germany
- Fakultät für Chemie und Chemische Biologie, Technische Universität Dortmund, Otto-Hahn-Straße 4a, 44227, Dortmund, Germany
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2
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Ma W, Kirchhoff JL, Strohmann C, Grabe B, Loh CCJ. Cooperative Bifurcated Chalcogen Bonding and Hydrogen Bonding as Stereocontrolling Elements for Selective Strain-Release Septanosylation. J Am Chem Soc 2023; 145:26611-26622. [PMID: 38032866 PMCID: PMC10722516 DOI: 10.1021/jacs.3c06984] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2023] [Revised: 11/08/2023] [Accepted: 11/08/2023] [Indexed: 12/02/2023]
Abstract
The exploitation of noncovalent interactions (NCIs) is emerging as a vital handle in tackling broad stereoselectivity challenges in synthesis. In particular, there has been significant recent interest in the harnessing of unconventional NCIs to surmount difficult selectivity challenges in glycosylations. Herein, we disclose the exploitation of an unconventional bifurcated chalcogen bonding and hydrogen bonding (HB) network, which paves the way for a robust catalytic strategy into biologically useful seven-membered ring sugars. Through 13C nuclear magnetic resonance (NMR) in situ monitoring, NMR titration experiments, and density functional theory (DFT) modeling, we propose a remarkable contemporaneous activation of multiple functional groups consisting of a bifurcated chalcogen bonding mechanism working hand-in-hand with HB activation. Significantly, the ester moiety installed on the glycosyl donor is critical in the establishment of the postulated ternary complex for stereocontrol. Through the 13C kinetic isotopic effect and kinetic studies, our data corroborated that a dissociative SNi-type mechanism forms the stereocontrolling basis for the excellent α-selectivity.
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Affiliation(s)
- Wenpeng Ma
- Abteilung
Chemische Biologie, Max-Planck-Institut
für Molekulare Physiologie, Otto-Hahn-Straße 11, Dortmund 44227, Germany
- Fakultät
für Chemie und Chemische Biologie, Technische Universität Dortmund, Otto-Hahn-Straße 4a, Dortmund 44227, Germany
| | - Jan-Lukas Kirchhoff
- Fakultät
für Chemie und Chemische Biologie, Anorganische Chemie, Technische Universität Dortmund, Otto-Hahn-Straße 6, Dortmund 44227, Germany
| | - Carsten Strohmann
- Fakultät
für Chemie und Chemische Biologie, Anorganische Chemie, Technische Universität Dortmund, Otto-Hahn-Straße 6, Dortmund 44227, Germany
| | - Bastian Grabe
- Fakultät
für Chemie und Chemische Biologie, Technische Universität Dortmund, Otto-Hahn-Straße 4a, Dortmund 44227, Germany
| | - Charles C. J. Loh
- Abteilung
Chemische Biologie, Max-Planck-Institut
für Molekulare Physiologie, Otto-Hahn-Straße 11, Dortmund 44227, Germany
- Fakultät
für Chemie und Chemische Biologie, Technische Universität Dortmund, Otto-Hahn-Straße 4a, Dortmund 44227, Germany
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3
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Pero B, Peczuh MW. Synthesis of a Diacetonide-Protected, Mannose-Based Oxepine: Configurational Control of Anomeric Acetate Activation. J Org Chem 2022; 87:7474-7479. [PMID: 35576505 PMCID: PMC10116867 DOI: 10.1021/acs.joc.2c00206] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Carbohydrate-based oxepines are seven-membered-ring oxacycles containing an enol ether moiety. These compounds have been used as intermediates in the preparation of septanose carbohydrates by functionalization through their double bond. Reported here is a new synthesis of a carbohydrate based oxepine that uses 2,3;4,6-di-O-acetonide mannose as a key starting material. The oxepine is an important precursor used in the synthesis of septanose glycomimetics of mannopyranosides. The central feature of the synthesis is a two-step sequence that converts a septanose 1,2-di-O-acetate to the septanosyl bromide and onward to the oxepine via a reductive elimination.
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Affiliation(s)
- Bryant Pero
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road, U3060, Storrs, Connecticut 06269, United States
| | - Mark W Peczuh
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road, U3060, Storrs, Connecticut 06269, United States
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4
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Bosko C, Vannam R, Peczuh MW. Synthesis of ring-expanded homologs of 3-amino pyranosides. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.153699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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5
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Lepage RJ, Moore PW, Hewitt RJ, Teesdale-Spittle PH, Krenske EH, Harvey JE. Mechanistic Studies on the Base-Promoted Ring Opening of Glycal-Derived gem-Dibromocyclopropanes. J Org Chem 2021; 87:301-315. [PMID: 34932347 DOI: 10.1021/acs.joc.1c02366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In the presence of a nucleophilic base, ring-fused gem-dibromocyclopropanes derived from d-glycals undergo ring opening to give 2-deoxy-2-(E-bromomethylene)glycosides. Such cleavage of an exocyclic cyclopropane bond contrasts with the more usual silver-promoted ring-expansion reactions in which endocyclic bond cleavage occurs. Experimental and theoretical studies are reported which provide insights into the reaction mechanism and the origin of its kinetic selectivity for E-configured bromoalkene products. Density functional theory computations (M06-2X) predict that the reaction commences with alkoxide-induced HBr elimination from the dibromocyclopropane to form a bromocyclopropene. Ring opening then gives a configurationally stable zwitterionic (oxocarbenium cation/vinyl carbanion) intermediate, which undergoes nucleophilic addition and protonation to give the bromoalkene. There are two competing sources of the proton in the final step: One is the alcohol (co)solvent, and the other is the molecule of alcohol produced during the initial deprotonation step. The roles of the formed alcohol molecule and the bulk (co)solvent are demonstrated by isotope-labeling studies performed with deuterated solvents. The acid-promoted isomerization of the E-bromoalkene product into the corresponding Z-bromoalkene is also described. The mechanistic knowledge gained in this investigation sheds light on the unusual chemistry of this system and facilitates its future application in new settings.
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Affiliation(s)
- Romain J Lepage
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, Queensland 4072, Australia
| | - Peter W Moore
- School of Chemical and Physical Sciences, Centre for Biodiscovery, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand
| | - Russell J Hewitt
- School of Chemical and Physical Sciences, Centre for Biodiscovery, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand
| | - Paul H Teesdale-Spittle
- School of Biological Sciences, Centre for Biodiscovery, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand
| | - Elizabeth H Krenske
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, Queensland 4072, Australia
| | - Joanne E Harvey
- School of Chemical and Physical Sciences, Centre for Biodiscovery, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand
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6
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Griesbach CE, Peczuh MW. Characterization of the low energy conformations and differential reactivities of D-glucose and D-mannose based oxepines. Org Biomol Chem 2021; 19:10635-10646. [PMID: 34850804 DOI: 10.1039/d1ob01900g] [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
Carbohydrate-based oxepines are valuable intermediates for the synthesis of septanose carbohydrates. Here we report the characterization of the preferred conformations of D-glucose and D-mannose based oxepines 1 and 2 using computational chemistry and NMR spectroscopy. Monte Carlo conformational searches on 1 and 2 were performed, followed by DFT optimization and single-point energy calculations on the low energy conformations of each oxepine. Coupling constants were computed for all unique conformations at a B3LYP/6-31G(d,p)u+1s level of theory and weighted based on a Boltzmann distribution. These values were then compared to the experimental values collected using 3JH,H values collected from 1H NMR spectra. Information from the MC/DFT approach was then used in a least squares method that correlated DFT calculated and observed 3JH,H coupling constants. The conformations of 1 and 2 are largely governed by a combination of the rigidifying enol ether element in combination with the reduction of unfavorable interactions. The vinylogous anomeric effect (VAE) emerged as a consequence, rather than a driver of conformations. Oxepine 1 showed greater reactivity in Ferrier rearrangement reactions relative to oxepine 2, in line with its greater %VAE.
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Affiliation(s)
- Caleb E Griesbach
- Department of Chemistry, University of Connecticut, 55 N. Eagleville Road, U3060, Storrs, CT 06269-3060, USA.
| | - Mark W Peczuh
- Department of Chemistry, University of Connecticut, 55 N. Eagleville Road, U3060, Storrs, CT 06269-3060, USA.
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7
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Jayaraman N. Display of Rich Reactivities of Endo- and Exocyclic Unsaturated Sugars that Parallel the Native Sugars. CHEM REC 2021; 21:3049-3062. [PMID: 33960656 DOI: 10.1002/tcr.202100091] [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: 03/22/2021] [Revised: 04/18/2021] [Accepted: 04/19/2021] [Indexed: 11/10/2022]
Abstract
Unsaturated monosaccharides expand the scope of reactivities in a sugar, directly leading to the development of newer methodologies, molecular structures and functional entities. The unsaturation as a reactive moiety can either be within the molecule, namely, endocyclic, or as a pendant moiety around the molecule, namely, exocyclic. One carbon homologations aided by reactions at the unsaturated moiety expand the molecular structures in both endo- and exocyclic sugars and lead to structures that are largely hitherto unknown. Molecular shifts and rearrangements permit interchanging the reactivities from one carbon to the other in unsaturated sugars. Activations of exocyclic unsaturated sugars also find newer possibilities to reactions central to the sugar chemistry, namely, the glycosylations. The personal reflections result from a couple of decades of explorations that traverse through the unsaturated sugars from different vantage points.
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8
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Choutka J, Kratochvíl M, Zýka J, Pohl R, Parkan K. Straightforward synthesis of protected 2-hydroxyglycals by chlorination-dehydrochlorination of carbohydrate hemiacetals. Carbohydr Res 2020; 496:108086. [PMID: 32828008 DOI: 10.1016/j.carres.2020.108086] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 06/18/2020] [Accepted: 06/18/2020] [Indexed: 10/23/2022]
Abstract
A straightforward and scalable method for the synthesis of protected 2-hydroxyglycals is described. The approach is based on the chlorination of carbohydrate-derived hemiacetals, followed by an elimination reaction to establish the glycal moiety. 1,2-dehydrochlorination reactions were studied on a range of glycosyl chlorides to provide suitable reaction conditions for this transformation. Benzyl ether, isopropylidene and benzylidene protecting groups, as well as interglycosidic linkage, were found to be compatible with this protocol. The described method is operationally simple and allows for the quick preparation of 2-hydroxyglycals with other than ester protecting groups, providing a feasible alternative to existing methods.
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Affiliation(s)
- Jan Choutka
- Department of Chemistry of Natural Compounds, University of Chemistry and Technology, Prague, Technická 5, 166 28, Prague, Czech Republic
| | - Michal Kratochvíl
- Department of Chemistry of Natural Compounds, University of Chemistry and Technology, Prague, Technická 5, 166 28, Prague, Czech Republic
| | - Jakub Zýka
- Department of Chemistry of Natural Compounds, University of Chemistry and Technology, Prague, Technická 5, 166 28, Prague, Czech Republic
| | - Radek Pohl
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Gilead Sciences & IOCB Research Centre, Flemingovo Nám. 2, 166 10, Prague, Czech Republic
| | - Kamil Parkan
- Department of Chemistry of Natural Compounds, University of Chemistry and Technology, Prague, Technická 5, 166 28, Prague, Czech Republic.
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9
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10
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Vannam R, Peczuh MW. A practical and scalable synthesis of carbohydrate based oxepines. Org Biomol Chem 2016; 14:3989-96. [PMID: 27056249 DOI: 10.1039/c6ob00262e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient, seven-step synthesis of carbohydrate based oxepines is reported using per-O-acetyl septanoses as key intermediates. The scope of the synthesis was evaluated by varying both the pyranose starting materials and protecting groups incorporated into the oxepine products. The practicality of the method make it amenable to scale up as demonstrated by the gram-scale synthesis of the d-glucose derived oxepine.
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Affiliation(s)
- Raghu Vannam
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road, U-3060, Storrs, CT 06269, USA.
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11
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Vannam R, Peczuh MW. How to Homologate Your Sugar: Synthetic Approaches to Septanosyl Containing Carbohydrates. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600052] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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12
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Thankachan AP, Sindhu KS, Krishnan KK, Anilkumar G. Recent advances in the syntheses, transformations and applications of 1,1-dihalocyclopropanes. Org Biomol Chem 2015; 13:8780-802. [PMID: 26173173 DOI: 10.1039/c5ob01088h] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
gem-Dihalocyclopropanes have wide-spread applications in organic synthesis due to their versatile chemistry. They can serve as substrates for a large range of useful materials such as natural products, alkaloids, cyclopropanes, heterocycles, aromatic ring systems etc. Normally the dihalocyclopropanes are prepared by the addition of dihalocarbene to alkene, but due to the great synthetic efficacy of gem-dihalocyclopropanes a number of methods have been developed for their synthesis. Generally gem-dihalocyclopropanes exist as strained cyclic systems with astonishing kinetic stability. They are capable of undergoing transformations leading to a variety of products which have potential applications in various synthetic organic chemistry fields.
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Affiliation(s)
- Amrutha P Thankachan
- School of Chemical Sciences, Mahatma Gandhi University, PD Hills P. O., Kottayam, Kerala, India 686560.
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Solid state structure of p-bromo phenyl 4,5,7-tri-O-benzyl-β-d-glycero-d-talo-septanoside and an analysis of non-covalent interactions. Carbohydr Res 2015; 410:9-14. [DOI: 10.1016/j.carres.2015.03.020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2015] [Revised: 03/20/2015] [Accepted: 03/21/2015] [Indexed: 11/21/2022]
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14
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σ-Ferrier rearrangement of carbohydrate derived vinylcyclopropanes: a facile approach to oxepane analogs. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.07.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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15
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Abstract
AbstractAddition of a carbene to a glycal is the prominent method for the synthesis of 1,2-cyclopropyl carbohydrates. This incorporation of a cyclopropane into a carbohydrate scaffold enables divergent reactivity, with the two main classes being ring expansion and cleavage to 2-C-branched carbohydrates. A wide variety of products are obtained depending on the functionality attached to the cyclopropane (none or ester or halogens) and the promoter (Lewis acid, Brønsted acid, halophile or base) used in the reaction. This article reviews progress in the synthesis and reactions of 1,2-cyclopropyl carbohydrates since 2000 and discloses efforts by our group in the area.
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16
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Abstract
AbstractConformational analysis of unnatural seven-membered sugars, namely, septanoses and septanosides are discussed herein. The conformational properties of these sugars in the solid state, solution phase and computational methods are presented. The analyses reveal that conformations of septanosides are diverse and largely unpredictable, as compared furanosides and pyranosides.
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Affiliation(s)
- Supriya Dey
- 1Indian Institute of Science, Department of Organic Chemistry, Bangalore –560012, India
| | - N. Jayaraman
- 1Indian Institute of Science, Department of Organic Chemistry, Bangalore –560012, India
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17
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Moore PW, Schuster JK, Hewitt RJ, Stone MRL, Teesdale-Spittle PH, Harvey JE. Divergent synthesis of 2-C-branched pyranosides and oxepines from 1,2-gem-dibromocyclopropyl carbohydrates. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.06.069] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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18
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Dey S, Basuroy K, Jayaraman N. Dense network of OH⋯O and CH⋯O interactions in the solid state structure of n-pentyl-2-chloro-2-deoxy-α-d-manno-sept 3-uloside. Carbohydr Res 2014; 393:37-42. [DOI: 10.1016/j.carres.2014.04.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2014] [Revised: 04/24/2014] [Accepted: 04/29/2014] [Indexed: 12/24/2022]
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19
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Wang C, Ma X, Zhang J, Tang Q, Jiao W, Shao H. Methanesulfonic-Acid-Catalysed Ring Opening and Glycosylation of 1,2-(Acetylcyclopropane)-AnnulatedD-Lyxofuranose. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402037] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Dey S, Jayaraman N. Exclusive ring opening of gem-dihalo-1,2-cyclopropanated oxyglycal to oxepines in AgOAc. Carbohydr Res 2014; 389:66-71. [PMID: 24612864 DOI: 10.1016/j.carres.2014.01.023] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Revised: 01/27/2014] [Accepted: 01/30/2014] [Indexed: 11/29/2022]
Abstract
Treatment of gem-dihalo-1,2-cyclopropanated d-oxyglycal with primary, secondary, and unsaturated alcohols, in the presence of AgOAc, leads to the formation of chloro-oxepines exclusively. Reaction of the resulting 2-chloro-oxepines with excess alcohol in the presence of AgOAc, do not promote further reactions. This result is in contrast to the reactions of d-glucal derived halo-oxepine with alcohols known previously that lead to the formation of furanoses as the major product under similar reaction conditions. Observation of this study consolidates the reactivity differences of gem-dihalo-1,2-cyclopropanated oxyglycals, as compared to gem-dihalo-1,2-cyclopropanated glycals.
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Affiliation(s)
- Supriya Dey
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560012, India
| | - N Jayaraman
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560012, India.
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21
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Bouché L, Reissig HU. Synthesis of Di- and Trivalent Carbohydrate Mimetics with Oxepane Substructure by Employing Copper-Catalyzed [3+2] Cycloadditions of Alkynes with Azidooxepanes. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402191] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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22
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Ma X, Zhang J, Tang Q, Ke J, Zou W, Shao H. Stereospecific [3+2] cycloaddition of 1,2-cyclopropanated sugars and ketones catalyzed by SnCl4: an efficient synthesis of multi-substituted perhydrofuro[2,3-b]furans and perhydrofuro[2,3-b]pyrans. Chem Commun (Camb) 2014; 50:3505-8. [DOI: 10.1039/c3cc48963a] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient stereospecific [3+2] cycloaddition of 1,2-cyclopropanated sugars and ketones catalyzed by SnCl4 is described.
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Affiliation(s)
- Xiaofeng Ma
- Natural Products Research Centre
- Chengdu Institute of Biology
- Chinese Academy of Sciences
- Chengdu, China
| | - Jichao Zhang
- Natural Products Research Centre
- Chengdu Institute of Biology
- Chinese Academy of Sciences
- Chengdu, China
| | - Qin Tang
- Natural Products Research Centre
- Chengdu Institute of Biology
- Chinese Academy of Sciences
- Chengdu, China
| | - Jun Ke
- Natural Products Research Centre
- Chengdu Institute of Biology
- Chinese Academy of Sciences
- Chengdu, China
| | - Wei Zou
- Institute for Biological Sciences
- National Research Council of Canada
- Ontario K1A 0R6, Canada
| | - Huawu Shao
- Natural Products Research Centre
- Chengdu Institute of Biology
- Chinese Academy of Sciences
- Chengdu, China
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23
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Venukumar P, Sudharani C, Sridhar PR. A one-pot septanoside formation and glycosylation of acyclic dithioacetals derived from 1,2-cyclopropanated sugars. Chem Commun (Camb) 2014; 50:2218-21. [DOI: 10.1039/c3cc49116a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A one-pot septanoside formation and glycosylation of acyclic dithioacetals derived from 1,2-cyclopropanated sugars is reported.
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24
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Ma X, Tang Q, Ke J, Yang X, Zhang J, Shao H. InCl3 Catalyzed Highly Diastereoselective [3 + 2] Cycloaddition of 1,2-Cyclopropanated Sugars with Aldehydes: A Straightforward Synthesis of Persubstituted Bis-Tetrahydrofurans and Perhydrofuro[2,3-b]pyrans. Org Lett 2013; 15:5170-3. [DOI: 10.1021/ol402192f] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xiaofeng Ma
- Natural Products Research Centre, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China, and University of Chinese Academy of Sciences, China
| | - Qin Tang
- Natural Products Research Centre, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China, and University of Chinese Academy of Sciences, China
| | - Jun Ke
- Natural Products Research Centre, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China, and University of Chinese Academy of Sciences, China
| | - Xinglong Yang
- Natural Products Research Centre, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China, and University of Chinese Academy of Sciences, China
| | - Jichao Zhang
- Natural Products Research Centre, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China, and University of Chinese Academy of Sciences, China
| | - Huawu Shao
- Natural Products Research Centre, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China, and University of Chinese Academy of Sciences, China
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25
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Ramakrishna B, Sridhar PR. Ring-Contraction vs Ring-Expansion Reactions of Spiro-cyclopropanecarboxylated Sugars. Org Lett 2013; 15:4474-7. [DOI: 10.1021/ol402021e] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Bandi Ramakrishna
- School of Chemistry, University of Hyderabad, Hyderabad-500 046, India
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Sridhar PR, Venukumar P. A Ring Expansion–Glycosylation Strategy toward the Synthesis of Septano-oligosaccharides. Org Lett 2012; 14:5558-61. [DOI: 10.1021/ol302677z] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
| | - Patteti Venukumar
- School of Chemistry, University of Hyderabad, Hyderabad 500046, India
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Saha J, Peczuh MW. Glycosylations with a septanosyl fluoride donor lacking a C2 protecting group. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.08.039] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Kleinke AS, Webb D, Jamison TF. Recent progress in the synthesis of oxepanes and medium ring ethers. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.05.081] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Jackowski O, Chrétien F, Didierjean C, Chapleur Y. Formation of septanoses from hexopyranosides via 5,6-exo-glycals. Carbohydr Res 2012; 356:93-103. [DOI: 10.1016/j.carres.2012.02.026] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2011] [Revised: 02/20/2012] [Accepted: 02/25/2012] [Indexed: 01/07/2023]
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Dey S, Jayaraman N. Branching out at C-2 of septanosides. Synthesis of 2-deoxy-2-C-alkyl/aryl septanosides from a bromo-oxepine. Beilstein J Org Chem 2012; 8:522-7. [PMID: 22509224 PMCID: PMC3326632 DOI: 10.3762/bjoc.8.59] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2012] [Accepted: 03/14/2012] [Indexed: 11/30/2022] Open
Abstract
This paper deals with the synthesis of 2-deoxy-2-C-alkyl/aryl septanosides. A range of such septanoside derivatives was synthesized by using a common bromo-oxepine intermediate, involving C-C bond forming organometallic reactions. Unsaturated, seven-membered septanoside vinyl bromides or bromo-oxepines, obtained through a ring expansion methodology of the cyclopropane derivatives of oxyglycals, displayed a good reactivity towards several acceptor moieties in C-C bond forming Heck, Suzuki and Sonogashira coupling reactions, thus affording 2-deoxy-2-C-alkyl/aryl septanosides. Whereas Heck and Sonogashira coupling reactions afforded 2-deoxy-2-C-alkenyl and -alkynyl derivatives, respectively, the Suzuki reaction afforded 2-deoxy-2-C-aryl septanosides. Deprotection and reduction of the 2-deoxy-2-alkenyl derivative afforded the corresponding 2-deoxy-2-C-alkyl septanoside free of protecting groups. The present study illustrates the reactivity of bromo-oxepine in the synthesis of hitherto unknown septanosides, branching out at C-2, through C-C bond formation with alkyl and aryl substituents.
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Affiliation(s)
- Supriya Dey
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560 012, India
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Abstract
Seven-atom ring sugars, called septanoses, are increasingly the focus of scientific inquiries because of their potential biological activities. This article details the synthesis, conformational analysis, and protein-binding properties of septanose carbohydrates. A distinction is drawn between septanoses that are substituted in the 6-position of the ring and those that are not. When a C-6 substituent is absent, the structure is essentially that of an aldohexose in its septanose, rather than furanose or pyranose, ring form; they may play as-of-yet unexplored roles in glycobiology. Septanoses having a hydroxymethyl group at C-6, on the other hand, are ring-expanded analogues of pyranoses. Syntheses have moved beyond the preparation of seven-membered ring monosaccharides to the development of septanosyl donors. These donors have been used in the synthesis of novel di- and trisaccharides that contain septanoses as well as a variety of glycoconjugates. Low-energy conformations adopted by septanoses have been organized based on ring substitution and stereochemistry. Instances where septanoses have been demonstrated to bind to natural proteins are presented and analyzed. The major conclusion drawn in the chapter is that advances in the synthesis of septanose carbohydrates now enable a detailed investigation of their activity in a number of biological contexts.
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Daskhan GC, Jayaraman N. Synthesis of 2-Deoxy-2-C-alkyl Glycal and Glycopyranosides from 2-Hydroxy Glycal Ester. J Org Chem 2012; 77:2185-91. [DOI: 10.1021/jo202240f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Gour Chand Daskhan
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560 012, India
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Saha J, Peczuh MW. Expanding the Scope of Aminosugars: Synthesis of 2‐Amino Septanosyl Glycoconjugates Using Septanosyl Fluoride Donors. Chemistry 2011; 17:7357-65. [DOI: 10.1002/chem.201003721] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2010] [Revised: 03/21/2011] [Indexed: 01/25/2023]
Affiliation(s)
- Jaideep Saha
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road, U‐3060, Storrs, CT 06269 (USA), Fax: (+1) 860‐486‐2981
| | - Mark W. Peczuh
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road, U‐3060, Storrs, CT 06269 (USA), Fax: (+1) 860‐486‐2981
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Banning JE, Prosser AR, Alnasleh BK, Smarker J, Rubina M, Rubin M. Diastereoselectivity Control in Formal Nucleophilic Substitution of Bromocyclopropanes with Oxygen- and Sulfur-Based Nucleophiles. J Org Chem 2011; 76:3968-86. [DOI: 10.1021/jo200368a] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Joseph E. Banning
- Department of Chemistry, The University of Kansas, 1251 Wesoce Hall Drive, Lawrence, Kansas 66045-75832, United States
| | - Anthony R. Prosser
- Department of Chemistry, The University of Kansas, 1251 Wesoce Hall Drive, Lawrence, Kansas 66045-75832, United States
| | - Bassam K. Alnasleh
- Department of Chemistry, The University of Kansas, 1251 Wesoce Hall Drive, Lawrence, Kansas 66045-75832, United States
| | - Jason Smarker
- Department of Chemistry, The University of Kansas, 1251 Wesoce Hall Drive, Lawrence, Kansas 66045-75832, United States
| | - Marina Rubina
- Department of Chemistry, The University of Kansas, 1251 Wesoce Hall Drive, Lawrence, Kansas 66045-75832, United States
| | - Michael Rubin
- Department of Chemistry, The University of Kansas, 1251 Wesoce Hall Drive, Lawrence, Kansas 66045-75832, United States
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35
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Tian Q, Dong L, Ma X, Xu L, Hu C, Zou W, Shao H. Stereoselective Synthesis of 2-C-Branched (Acetylmethyl) Oligosaccharides and Glycoconjugates: Lewis Acid-Catalyzed Glycosylation from 1,2-Cyclopropaneacetylated Sugars. J Org Chem 2011; 76:1045-53. [DOI: 10.1021/jo1016579] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Qiang Tian
- Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China
| | - Liang Dong
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Xiaofeng Ma
- Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China
| | - Liyan Xu
- Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China
| | - Changwei Hu
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Wei Zou
- Institute for Biological Sciences, National Research Council of Canada, 100 Sussex Drive, Ottawa, Ontario K1A 0R6, Canada, and Graduate School of Chinese Academy of Sciences, China
| | - Huawu Shao
- Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China
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Hewitt RJ, Harvey JE. Synthesis of C-furanosides from ad-glucal-derived cyclopropane through a ring-expansion/ring-contraction sequence. Chem Commun (Camb) 2011; 47:421-3. [DOI: 10.1039/c0cc02244f] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Hewitt RJ, Harvey JE. Synthesis of Oxepines and 2-Branched Pyranosides from a d-Glucal-Derived gem-Dibromo-1,2-cyclopropanated Sugar. J Org Chem 2010; 75:955-8. [DOI: 10.1021/jo902306a] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Russell J. Hewitt
- School of Chemical and Physical Sciences, Victoria University of Wellington, P.O. Box 600, Wellington, New Zealand
| | - Joanne E. Harvey
- School of Chemical and Physical Sciences, Victoria University of Wellington, P.O. Box 600, Wellington, New Zealand
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Gómez AM, Lobo F, Pérez de las Vacas D, Valverde S, López JC. Formation and reactivity of new Nicholas–Ferrier pyranosidic cations: novel access to oxepanes via a 1,6-hydride shift/cyclization sequence. Chem Commun (Camb) 2010; 46:6159-61. [DOI: 10.1039/c0cc00586j] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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