1
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Pyridoneimine-catalyzed anomeric aqueous oxa-Michael additions of native mono- and disaccharides. Carbohydr Res 2022; 520:108610. [PMID: 35863121 DOI: 10.1016/j.carres.2022.108610] [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: 03/16/2022] [Revised: 06/03/2022] [Accepted: 06/06/2022] [Indexed: 11/23/2022]
Abstract
A pyridoneimine-catalyzed oxa-Michael addition of protecting groups-free, native mono- and disaccharides with Michael acceptors in aq. solution is reported. Several mono- and disaccharides are reacted with acceptors, namely, methylvinyl ketone, acrylonitrile and tert-butyl acrylate in aq. solution, the addition catalyzed by n-pentylpyridone imine. The addition occurs site-selectively at the anomeric lactol and the remaining hydroxy functionalities are un-affected. The resulting keto-glycopyranoside products are explored in aldol, allylation and oxime product formation, occurring at either α-methyl moiety or at the keto-moiety, with appropriate synthons. In another direction, the keto-glycopyranoside is functionalized further with amino acids through reductive amination in aq. methanol solution. Formation of hemiacetal anion occurs in the presence of pyridoneimine in aq. Solution, enabling subsequent addition to occur with acceptors. Facile reductive amination of the resulting keto-glycoside provides an avenue for conjugations with amino acids in the present work.
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2
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Ji P, Zhang Y, Gao F, Bi F, Wang W. Direct, stereoselective thioglycosylation enabled by an organophotoredox radical strategy. Chem Sci 2020; 11:13079-13084. [PMID: 34094490 PMCID: PMC8163235 DOI: 10.1039/d0sc04136j] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Accepted: 10/19/2020] [Indexed: 12/13/2022] Open
Abstract
While strategies involving a 2e- transfer pathway have dictated glycosylation development, the direct glycosylation of readily accessible glycosyl donors as radical precursors is particularly appealing because of high radical anomeric selectivity and atom- and step-economy. However, the development of the radical process has been challenging owing to notorious competing reduction, elimination and/or SN side reactions of commonly used, labile glycosyl donors. Here we introduce an organophotocatalytic strategy through which glycosyl bromides can be efficiently converted into corresponding anomeric radicals by photoredox mediated HAT catalysis without a transition metal or a directing group and achieve highly anomeric selectivity. The power of this platform has been demonstrated by the mild reaction conditions enabling the synthesis of challenging α-1,2-cis-thioglycosides, the tolerance of various functional groups and the broad substrate scope for both common pentoses and hexoses. Furthermore, this general approach is compatible with both sp2 and sp3 sulfur electrophiles and late-stage glycodiversification for a total of 50 substrates probed.
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Affiliation(s)
- Peng Ji
- Departments of Pharmacology and Toxicology and Chemistry and Biochemistry, BIO5 Institute, and University of Arizona Cancer Centre, University of Arizona Tucson AZ 85721 USA
| | - Yueteng Zhang
- Departments of Pharmacology and Toxicology and Chemistry and Biochemistry, BIO5 Institute, and University of Arizona Cancer Centre, University of Arizona Tucson AZ 85721 USA
| | - Feng Gao
- Departments of Pharmacology and Toxicology and Chemistry and Biochemistry, BIO5 Institute, and University of Arizona Cancer Centre, University of Arizona Tucson AZ 85721 USA
| | - Fangchao Bi
- Departments of Pharmacology and Toxicology and Chemistry and Biochemistry, BIO5 Institute, and University of Arizona Cancer Centre, University of Arizona Tucson AZ 85721 USA
| | - Wei Wang
- Departments of Pharmacology and Toxicology and Chemistry and Biochemistry, BIO5 Institute, and University of Arizona Cancer Centre, University of Arizona Tucson AZ 85721 USA
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3
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Meguro Y, Noguchi M, Li G, Shoda SI. Efficient generation of thiolate sugars from glycosyl Bunte salts and its application to S-glycoside synthesis. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.152198] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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4
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Ibrahim N, Alami M, Messaoudi S. Recent Advances in Transition-Metal-Catalyzed Functionalization of 1-Thiosugars. ASIAN J ORG CHEM 2018. [DOI: 10.1002/ajoc.201800449] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Nada Ibrahim
- BioCIS, Univ. Paris-Sud; CNRS; University Paris-Saclay; 92290 Châtenay-Malabry France
| | - Mouad Alami
- BioCIS, Univ. Paris-Sud; CNRS; University Paris-Saclay; 92290 Châtenay-Malabry France
| | - Samir Messaoudi
- BioCIS, Univ. Paris-Sud; CNRS; University Paris-Saclay; 92290 Châtenay-Malabry France
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5
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AL-Shuaeeb RAA, Montoir D, Alami M, Messaoudi S. Synthesis of (1 → 2)-S-Linked Saccharides and S-Linked Glycoconjugates via a Palladium-G3-XantPhos Precatalyst Catalysis. J Org Chem 2017; 82:6720-6728. [DOI: 10.1021/acs.joc.7b00861] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Riyadh Ahmed Atto AL-Shuaeeb
- Laboratoire de Chimie Thérapeutique,
Faculté de Pharmacie, University of Paris-Sud, CNRS, BioCIS-UMR 8076, 5 rue J.-B. Clément, Châtenay-Malabry F-92296, France
| | - David Montoir
- Laboratoire de Chimie Thérapeutique,
Faculté de Pharmacie, University of Paris-Sud, CNRS, BioCIS-UMR 8076, 5 rue J.-B. Clément, Châtenay-Malabry F-92296, France
| | - Mouad Alami
- Laboratoire de Chimie Thérapeutique,
Faculté de Pharmacie, University of Paris-Sud, CNRS, BioCIS-UMR 8076, 5 rue J.-B. Clément, Châtenay-Malabry F-92296, France
| | - Samir Messaoudi
- Laboratoire de Chimie Thérapeutique,
Faculté de Pharmacie, University of Paris-Sud, CNRS, BioCIS-UMR 8076, 5 rue J.-B. Clément, Châtenay-Malabry F-92296, France
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6
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Villadsen K, Martos-Maldonado MC, Jensen KJ, Thygesen MB. Chemoselective Reactions for the Synthesis of Glycoconjugates from Unprotected Carbohydrates. Chembiochem 2017; 18:574-612. [DOI: 10.1002/cbic.201600582] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Indexed: 12/27/2022]
Affiliation(s)
- Klaus Villadsen
- Department of Chemistry; University of Copenhagen; Faculty of Science; Thorvaldsensvej 40 1871 Frederiksberg C Denmark
| | - Manuel C. Martos-Maldonado
- Department of Chemistry; University of Copenhagen; Faculty of Science; Thorvaldsensvej 40 1871 Frederiksberg C Denmark
| | - Knud J. Jensen
- Department of Chemistry; University of Copenhagen; Faculty of Science; Thorvaldsensvej 40 1871 Frederiksberg C Denmark
| | - Mikkel B. Thygesen
- Department of Chemistry; University of Copenhagen; Faculty of Science; Thorvaldsensvej 40 1871 Frederiksberg C Denmark
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7
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Alexander SR, Lim D, Amso Z, Brimble MA, Fairbanks AJ. Protecting group free synthesis of glycosyl thiols from reducing sugars in water; application to the production of N-glycan glycoconjugates. Org Biomol Chem 2017; 15:2152-2156. [DOI: 10.1039/c7ob00112f] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Un-protected 2-acetamido terminated reducing sugars may be converted into the corresponding glycosyl thiols in water, and conjugated to peptides using the thiol–ene click reaction without recourse to any protecting groups.
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Affiliation(s)
- S. R. Alexander
- Department of Chemistry
- University of Canterbury
- Christchurch 8140
- New Zealand
| | - D. Lim
- Department of Chemistry
- University of Canterbury
- Christchurch 8140
- New Zealand
| | - Z. Amso
- School of Chemical Sciences
- The University of Auckland
- Auckland 1142
- New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery
| | - M. A. Brimble
- School of Chemical Sciences
- The University of Auckland
- Auckland 1142
- New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery
| | - A. J. Fairbanks
- Department of Chemistry
- University of Canterbury
- Christchurch 8140
- New Zealand
- Biomolecular Interaction Centre
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8
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Köhling S, Exner MP, Nojoumi S, Schiller J, Budisa N, Rademann J. One-Pot Synthesis of Unprotected Anomeric Glycosyl Thiols in Water for Glycan Ligation Reactions with Highly Functionalized Sugars. Angew Chem Int Ed Engl 2016; 55:15510-15514. [DOI: 10.1002/anie.201607228] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Revised: 09/26/2016] [Indexed: 11/07/2022]
Affiliation(s)
- Sebastian Köhling
- Medicinal Chemistry, Institut für Pharmazie; Freie Universität Berlin; Königin-Luise-Strasse 2+4 14195 Berlin Germany
- Institut für Biophysik; Universität Leipzig; Härtelstrasse 16-18 04107 Leipzig Germany
| | - Matthias P. Exner
- Institut für Chemie; Technische Universität Berlin; Müller-Breslau-Strasse 10 10623 Berlin Germany
| | - Saba Nojoumi
- Institut für Chemie; Technische Universität Berlin; Müller-Breslau-Strasse 10 10623 Berlin Germany
| | - Jürgen Schiller
- Institut für Biophysik; Universität Leipzig; Härtelstrasse 16-18 04107 Leipzig Germany
| | - Nediljko Budisa
- Institut für Chemie; Technische Universität Berlin; Müller-Breslau-Strasse 10 10623 Berlin Germany
| | - Jörg Rademann
- Medicinal Chemistry, Institut für Pharmazie; Freie Universität Berlin; Königin-Luise-Strasse 2+4 14195 Berlin Germany
- Institut für Biophysik; Universität Leipzig; Härtelstrasse 16-18 04107 Leipzig Germany
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9
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Köhling S, Exner MP, Nojoumi S, Schiller J, Budisa N, Rademann J. Eintopfsynthese ungeschützter anomerer Glykosylthiole in Wasser für Glykan-Ligationen mit hochfunktionalisierten Zuckern. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201607228] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Sebastian Köhling
- Medizinische Chemie, Institut für Pharmazie; Freie Universität Berlin; Königin-Luise-Straße 2+4 14195 Berlin Deutschland
- Institut für Biophysik; Universität Leipzig; Härtelstraße 16-18 04107 Leipzig Deutschland
| | - Matthias P. Exner
- Institut für Chemie; Technische Universität Berlin; Müller-Breslau-Straße 10 10623 Berlin Deutschland
| | - Saba Nojoumi
- Institut für Chemie; Technische Universität Berlin; Müller-Breslau-Straße 10 10623 Berlin Deutschland
| | - Jürgen Schiller
- Institut für Biophysik; Universität Leipzig; Härtelstraße 16-18 04107 Leipzig Deutschland
| | - Nediljko Budisa
- Institut für Chemie; Technische Universität Berlin; Müller-Breslau-Straße 10 10623 Berlin Deutschland
| | - Jörg Rademann
- Medizinische Chemie, Institut für Pharmazie; Freie Universität Berlin; Königin-Luise-Straße 2+4 14195 Berlin Deutschland
- Institut für Biophysik; Universität Leipzig; Härtelstraße 16-18 04107 Leipzig Deutschland
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10
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Komor R, Kasprzycka A, Pastuch-Gawołek G, Szeja W. Simple synthesis of glycosylthiols and thioglycosides by rearrangement of O-glycosyl thionocarbamates. Carbohydr Res 2014; 396:37-42. [DOI: 10.1016/j.carres.2014.07.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2014] [Revised: 06/30/2014] [Accepted: 07/01/2014] [Indexed: 11/16/2022]
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11
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Ghosh T, Santra A, Misra AK. Appel-reagent-mediated transformation of glycosyl hemiacetal derivatives into thioglycosides and glycosyl thiols. Beilstein J Org Chem 2013; 9:974-982. [PMID: 23766814 PMCID: PMC3678522 DOI: 10.3762/bjoc.9.112] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2013] [Accepted: 04/29/2013] [Indexed: 11/23/2022] Open
Abstract
A series of glycosyl hemiacetal derivatives have been transformed into thioglycosides and glycosyl thiols in a one-pot two-step reaction sequence mediated by Appel reagent (carbon tetrabromide and triphenylphosphine). 1,2-trans-Thioglycosides and β-glycosyl thiol derivatives were stereoselectively formed by the reaction of the in situ generated glycosyl bromides with thiols and sodium carbonotrithioate. The reaction conditions are reasonably simple and yields were very good.
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Affiliation(s)
- Tamashree Ghosh
- Bose Institute, Division of Molecular Medicine, P-1/12, C.I.T. Scheme VII-M, Kolkata-700054, India, Fax: 91-33-2355 3886
| | - Abhishek Santra
- Bose Institute, Division of Molecular Medicine, P-1/12, C.I.T. Scheme VII-M, Kolkata-700054, India, Fax: 91-33-2355 3886
| | - Anup Kumar Misra
- Bose Institute, Division of Molecular Medicine, P-1/12, C.I.T. Scheme VII-M, Kolkata-700054, India, Fax: 91-33-2355 3886
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12
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Jana M, Misra AK. Stereoselective Synthesis of β-Glycosyl Thiols and Their Synthetic Applications. J Org Chem 2013; 78:2680-6. [DOI: 10.1021/jo302115k] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Manas Jana
- Bose Institute, Division of Molecular Medicine, P-1/12,
C.I.T. Scheme VII M, Kolkata 700054, India
| | - Anup Kumar Misra
- Bose Institute, Division of Molecular Medicine, P-1/12,
C.I.T. Scheme VII M, Kolkata 700054, India
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13
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Gingras M, Chabre YM, Roy M, Roy R. How do multivalent glycodendrimers benefit from sulfur chemistry? Chem Soc Rev 2013; 42:4823-41. [DOI: 10.1039/c3cs60090d] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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14
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15
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Dere RT, Kumar A, Kumar V, Zhu X, Schmidt RR. Synthesis of Glycosylthiols and Reactivity Studies. J Org Chem 2011; 76:7539-45. [DOI: 10.1021/jo200624e] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ravindra T. Dere
- Fachbereich Chemie, Universität Konstanz, Fach 725, D-78457 Konstanz, Germany
| | - Amit Kumar
- Fachbereich Chemie, Universität Konstanz, Fach 725, D-78457 Konstanz, Germany
| | - Vipin Kumar
- Fachbereich Chemie, Universität Konstanz, Fach 725, D-78457 Konstanz, Germany
| | - Xiangming Zhu
- College of Chemistry & Life Sciences, Zhejiang Normal University, Jinhua 321004, Zhejiang, China
| | - Richard R. Schmidt
- Fachbereich Chemie, Universität Konstanz, Fach 725, D-78457 Konstanz, Germany
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16
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A facile preparation of trehalose analogues: 1,1-thiodisaccharides. Carbohydr Res 2009; 344:1039-45. [DOI: 10.1016/j.carres.2009.03.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2008] [Revised: 03/03/2009] [Accepted: 03/17/2009] [Indexed: 02/02/2023]
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17
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El Ashry ESH, Awad LF, Hamid HMA, Atta AI. Synthesis of Interglycosidically S‐Linked 1‐Thio‐Oligosaccharides Under Microwave Irradiation. J Carbohydr Chem 2006. [DOI: 10.1080/07328300500282540] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- El Sayed H. El Ashry
- a Chemistry Department, Faculty of Science , Alexandria University , Alexandria, Egypt
| | - Laila F. Awad
- a Chemistry Department, Faculty of Science , Alexandria University , Alexandria, Egypt
| | - H. M. Abdel Hamid
- a Chemistry Department, Faculty of Science , Alexandria University , Alexandria, Egypt
| | - Atta I. Atta
- a Chemistry Department, Faculty of Science , Alexandria University , Alexandria, Egypt
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18
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Bernardes GJL, Gamblin DP, Davis BG. The Direct Formation of Glycosyl Thiols from Reducing Sugars Allows One-Pot Protein Glycoconjugation. Angew Chem Int Ed Engl 2006; 45:4007-11. [PMID: 16673441 DOI: 10.1002/anie.200600685] [Citation(s) in RCA: 106] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Gonçalo J L Bernardes
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA, UK.
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19
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Bernardes GJL, Gamblin DP, Davis BG. The Direct Formation of Glycosyl Thiols from Reducing Sugars Allows One-Pot Protein Glycoconjugation. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200600685] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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20
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Lundt I, Bock K. Christian Pedersen 1926–2003. Adv Carbohydr Chem Biochem 2006. [DOI: 10.1016/s0065-2318(06)60001-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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21
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Fujihira T, Takido T, Seno M. Synthesis of alkyl and arylthioglycosides and thiodisaccharides via thioiminium salts in a two-phase system. ACTA ACUST UNITED AC 1999. [DOI: 10.1016/s1381-1169(98)00082-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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22
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García Fernández JM, Ortiz Mellet C, Defaye J. Sulfur Atom Participation in Thiooligosaccharide Chemistry: Synthesis of 1‘-Thiotrehalulose and 1‘-epi-Thiotrehalulose and Comparative Reactivity with the O-Linked Disaccharide Analogue, Trehalulose. J Org Chem 1998. [DOI: 10.1021/jo972203k] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- José M. García Fernández
- CNRS and Université Joseph Fourier-Grenoble 1, Département de Pharmacochimie Moléculaire/Glucides, BP 138, F-38243 Meylan, France
| | - Carmen Ortiz Mellet
- CNRS and Université Joseph Fourier-Grenoble 1, Département de Pharmacochimie Moléculaire/Glucides, BP 138, F-38243 Meylan, France
| | - Jacques Defaye
- CNRS and Université Joseph Fourier-Grenoble 1, Département de Pharmacochimie Moléculaire/Glucides, BP 138, F-38243 Meylan, France
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23
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Thiooligosaccharides in glycobiology. GLYCOSCIENCE SYNTHESIS OF SUBSTRATE ANALOGS AND MIMETICS 1997. [DOI: 10.1007/bfb0119254] [Citation(s) in RCA: 131] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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24
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Abstract
Sucrose reacts quantitatively, when dissolved at high concentration in anhydrous hydrogen fluoride, to afford a complex mixture of difructose dianhydrides and their glucosylated derivatives. Oligo- and small poly-saccharides up to dp 14 were detected by FABMS. Oligosaccharides up to dp 4, representing approximately 50% of the total mixture, have been isolated and characterized by mass spectrometry, 13C NMR spectroscopy, and comparison with reference oligosaccharides previously obtained by unambiguous synthesis. alpha-D-Fructofuranose beta-D-fructopyranose 1,2':2,1'-dianhydride is the main spirodioxanyl pseudodisaccharide entity found in the mixture, either free or glucosylated at C-6 and to a lesser extent at C-3, C-4, C-4', C-6, and C-5' C-6. Minor spirodioxanyl pseudodisaccharide components are di-beta-D-fructopyranose 1,2':2,1'-dianhydride, which has also been found glucosylated at C-5, alpha-D-fructopyranose beta-D-fructopyranose 1,2':2,1'-dianhydride, beta-D-fructofuranose beta-D-fructopyranose 1,2':2,3'-dianhydride, and the 6,6'-diglucosylated alpha-D-fructofuranose beta-D-fructofuranose 1,2':2,1'-dianhydride. A 13C NMR examination of the higher mass oligomeric fraction suggests that it may involve 6-O-isomaltooligoglycosyl alpha-D-fructofuranose beta-D-fructopyranose 1,2':2,1'-dianhydrides as the main structural components. The reaction of sucrose in anhydrous HF is believed to proceed through initial selective protonic activation of the tertiary anomeric carbon atom of the fructose moiety, resulting in the quantitative formation of difructose dianhydrides, which subsequently suffer electrophilic substitution by glucopyranosyl oxocarbenium ions generated in a second step by action of the HF.
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Affiliation(s)
- J Defaye
- Département de Recherche Fondamentale, Matière Condensée/SESAM, Centre d'Etudes de Grenoble, France
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25
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Defaye J, Guillot JM, Biely P, Vrsanská M. Positional isomers of thioxylobiose, their synthesis and inducing ability for D-xylan-degrading enzymes in the yeast Cryptococcus albidus. Carbohydr Res 1992; 228:47-64. [PMID: 1516094 DOI: 10.1016/s0008-6215(00)90548-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Isomeric S-linked 2-thioxylobiose 10, 3-thioxylobiose 17, and 4-thioxylobiose 19 were conveniently prepared by SN2 displacement of suitable triflylglycoses with the sodium salt of 2,3,4-tri-O-acetyl-1-thio-beta-D-glucopyranose, either in N,N-dimethylformamide, or in oxolan in the presence of a sodium complexing agent. Allyl 3,5-O-isopropylidene-2-O-trifluoromethanesulfonyl-beta-D-lyxofu ranoside was a convenient electrophilic precursor for 10, which was smoothly obtained after a short sequence of deprotection involving conversion to the 1-propenyl glycoside. 1,2:5,6-Di-O-isopropylidene-3-O-trifluoromethylsulfonyl-alpha-D-++ +allofuranose and 1,2,3-tri-O-benzoyl-4-O-trifluoromethylsulfonyl-beta-L-arabinop yranose were the respective precursors for 17 and 19. 4-Thioxylobiose has a highly stimulatory effect on the synthesis of enzymes of the xylanolytic system in the yeast Cryptococcus albidus when applied to the cells in the presence of the natural disaccharide inducer (1----4)-beta-D-xylobiose.
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Affiliation(s)
- J Defaye
- Département de Recherche Fondamentale, Centre d'Etudes Nucléaires de Grenoble, France
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26
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Bock K, Pedersen C, Defaye J, Gadelle A. Steric and electronic effects in the formation of dihexulose dianhydrides. Reaction of racemic sorbose in anhydrous hydrogen fluoride and a facile synthesis of D-sorbose. Carbohydr Res 1991; 216:141-8. [PMID: 1797377 DOI: 10.1016/0008-6215(92)84157-n] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Treatment of DL-sorbose with anhydrous hydrogen fluoride gave a high yield of alpha-D-sorbopyranose alpha-L-sorbopyranose 1,2':2,1'-dianhydride. Similarly a mixture of D-fructose and D-sorbose gave a good yield of beta-D-fructopyranose alpha-D-sorbopyranose 1,2':2,1'-dianhydride. The formation of these products compared to the more complicated mixtures of compounds obtained by treatment of L-sorbose or D-fructose with hydrogen fluoride, is discussed in terms of conformations, and steric and electronic factors.
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Affiliation(s)
- K Bock
- Department of Organic Chemistry, Technical University of Denmark, Lyngby
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