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Qin C, Li L, Tian G, Ding M, Zhu S, Song W, Hu J, Seeberger PH, Yin J. Chemical Synthesis and Antigenicity Evaluation of Shigella dysenteriae Serotype 10 O-Antigen Tetrasaccharide Containing a ( S)-4,6- O-Pyruvyl Ketal. J Am Chem Soc 2022; 144:21068-21079. [DOI: 10.1021/jacs.2c05953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Chunjun Qin
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Lihu Avenue 1800, Wuxi, Jiangsu 214122, P. R. China
- Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, Potsdam 14476, Germany
| | - Lingxin Li
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Lihu Avenue 1800, Wuxi, Jiangsu 214122, P. R. China
| | - Guangzong Tian
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Lihu Avenue 1800, Wuxi, Jiangsu 214122, P. R. China
- Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, Potsdam 14476, Germany
| | - Meiru Ding
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Lihu Avenue 1800, Wuxi, Jiangsu 214122, P. R. China
| | - Shengyong Zhu
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Lihu Avenue 1800, Wuxi, Jiangsu 214122, P. R. China
| | - Wuqiong Song
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Lihu Avenue 1800, Wuxi, Jiangsu 214122, P. R. China
| | - Jing Hu
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Lihu Avenue 1800, Wuxi, Jiangsu 214122, P. R. China
- Wuxi School of Medicine, Jiangnan University, Lihu Avenue 1800, Wuxi, Jiangsu 214122, P. R. China
| | - Peter H. Seeberger
- Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, Potsdam 14476, Germany
| | - Jian Yin
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Lihu Avenue 1800, Wuxi, Jiangsu 214122, P. R. China
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2
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Boutet J, Blasco P, Guerreiro C, Thouron F, Dartevelle S, Nato F, Cañada FJ, Ardá A, Phalipon A, Jiménez-Barbero J, Mulard LA. Detailed Investigation of the Immunodominant Role of O-Antigen Stoichiometric O-Acetylation as Revealed by Chemical Synthesis, Immunochemistry, Solution Conformation and STD-NMR Spectroscopy for Shigella flexneri 3a. Chemistry 2016; 22:10892-911. [PMID: 27376496 DOI: 10.1002/chem.201600567] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2016] [Indexed: 02/02/2023]
Abstract
Shigella flexneri 3a causes bacillary dysentery. Its O-antigen has the {2)-[α-d-Glcp-(1→3)]-α-l-Rhap-(1→2)-α-l-Rhap-(1→3)-[Ac→2]-α-l-Rhap-(1→3)-[Ac→6]≈40 % -β-d-GlcpNAc-(1→} ([(E)ABAc CAc D]) repeating unit, and the non-O-acetylated equivalent defines S. flexneri X. Propyl hepta-, octa-, and decasaccharides sharing the (E')A'BAc CD(E)A sequence, and their non-O-acetylated analogues were synthesized from a fully protected BAc CD(E)A allyl glycoside. The stepwise introduction of orthogonally protected mono- and disaccharide imidate donors was followed by a two-step deprotection process. Monoclonal antibody binding to twenty-six S. flexneri types 3a and X di- to decasaccharides was studied by an inhibition enzyme-linked immunosorbent assay (ELISA) and STD-NMR spectroscopy. Epitope mapping revealed that the 2C -acetate dominated the recognition by monoclonal IgG and IgM antibodies and that the BAc CD segment was essential for binding. The glucosyl side chain contributed to a lesser extent, albeit increasingly with the chain length. Moreover, tr-NOESY analysis also showed interaction but did not reveal any meaningful conformational change upon antibody binding.
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Affiliation(s)
- Julien Boutet
- Institut Pasteur, Unité de Chimie des Biomolécules, 28 rue du Dr. Roux, 75724, Paris Cedex 15, France.,CNRS UMR 3523, Institut Pasteur, 75015, Paris, France.,Université Paris Descartes, Institut Pasteur, 75015, Paris, France.,Present address for J.B.: Adisseo (France), Present address for P.B., Dept. of Organic Chemistry, Arrhenius Laboratory, Stockholm University, 10691, Stockholm, Sweden
| | - Pilar Blasco
- Chemical and Physical Biology, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain.,Present address for J.B.: Adisseo (France), Present address for P.B., Dept. of Organic Chemistry, Arrhenius Laboratory, Stockholm University, 10691, Stockholm, Sweden
| | - Catherine Guerreiro
- Institut Pasteur, Unité de Chimie des Biomolécules, 28 rue du Dr. Roux, 75724, Paris Cedex 15, France.,CNRS UMR 3523, Institut Pasteur, 75015, Paris, France
| | - Françoise Thouron
- Institut Pasteur, Unité de Pathogénie Microbienne Moléculaire, 28 rue du Dr. Roux, 75015, Paris, France.,INSERM U1202, Institut Pasteur, 75015, Paris, France
| | - Sylvie Dartevelle
- Institut Pasteur, PF5, 28 rue du Dr. Roux, 75015, Paris, France.,CNRS UMR 3528, Institut Pasteur, 75015, Paris, France
| | - Farida Nato
- Institut Pasteur, PF5, 28 rue du Dr. Roux, 75015, Paris, France.,CNRS UMR 3528, Institut Pasteur, 75015, Paris, France
| | - F Javier Cañada
- Chemical and Physical Biology, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain
| | - Ana Ardá
- Chemical and Physical Biology, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain.,Molecular Recognition & Host-Pathogen Interactions Program, CIC bioGUNE, Bizkaia Technological Park, Building 801A, 48160, Derio, Spain
| | - Armelle Phalipon
- Institut Pasteur, Unité de Pathogénie Microbienne Moléculaire, 28 rue du Dr. Roux, 75015, Paris, France.,INSERM U1202, Institut Pasteur, 75015, Paris, France
| | - Jesús Jiménez-Barbero
- Chemical and Physical Biology, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain. .,Molecular Recognition & Host-Pathogen Interactions Program, CIC bioGUNE, Bizkaia Technological Park, Building 801A, 48160, Derio, Spain. .,Ikerbasque, Basque Foundation for Science, Maria Lopez de Haro 3, 48013, Bilbao, Spain.
| | - Laurence A Mulard
- Institut Pasteur, Unité de Chimie des Biomolécules, 28 rue du Dr. Roux, 75724, Paris Cedex 15, France. .,CNRS UMR 3523, Institut Pasteur, 75015, Paris, France.
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3
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Gauthier C, Chassagne P, Theillet FX, Guerreiro C, Thouron F, Nato F, Delepierre M, Sansonetti PJ, Phalipon A, Mulard LA. Non-stoichiometric O-acetylation of Shigella flexneri 2a O-specific polysaccharide: synthesis and antigenicity. Org Biomol Chem 2016; 12:4218-32. [PMID: 24836582 DOI: 10.1039/c3ob42586j] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Synthetic functional mimics of the O-antigen from Shigella flexneri 2a are seen as promising vaccine components against endemic shigellosis. Herein, the influence of the polysaccharide non-stoichiometric di-O-acetylation on antigenicity is addressed for the first time. Three decasaccharides, representing relevant internal mono- and di-O-acetylation profiles of the O-antigen, were synthesized from a pivotal protected decasaccharide designed to tailor late stage site-selective O-acetylation. The latter was obtained via a convergent route involving the imidate glycosylation chemistry. Binding studies to five protective mIgGs showed that none of the acetates adds significantly to broad antibody recognition. Yet, one of the five antibodies had a unique pattern of binding. With IC50 in the micromolar to submicromolar range mIgG F22-4 exemplifies a remarkable tight binding antibody against diversely O-acetylated and non-O-acetylated fragments of a neutral polysaccharide of medical importance.
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Affiliation(s)
- Charles Gauthier
- Institut Pasteur, Chimie des Biomolécules, Dépt de Biologie Structurale et Chimie, 28 rue du Dr Roux, 75724 Paris Cedex 15, France.
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4
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Hargreaves JM, Le Guen Y, Guerreiro C, Descroix K, Mulard LA. Linear synthesis of the branched pentasaccharide repeats of O-antigens from Shigella flexneri 1a and 1b demonstrating the major steric hindrance associated with type-specific glucosylation. Org Biomol Chem 2014; 12:7728-49. [DOI: 10.1039/c4ob01200c] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Shigella flexneri serotypes 1b and 1a are Gram-negative enteroinvasive bacteria causing shigellosis in humans.
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Affiliation(s)
- Jason M. Hargreaves
- Institut Pasteur
- Unité de Chimie des Biomolécules
- 75724 Paris Cedex 15, France
- CNRS UMR3523
- Institut Pasteur
| | - Yann Le Guen
- Institut Pasteur
- Unité de Chimie des Biomolécules
- 75724 Paris Cedex 15, France
- CNRS UMR3523
- Institut Pasteur
| | - Catherine Guerreiro
- Institut Pasteur
- Unité de Chimie des Biomolécules
- 75724 Paris Cedex 15, France
- CNRS UMR3523
- Institut Pasteur
| | - Karine Descroix
- Institut Pasteur
- Unité de Chimie des Biomolécules
- 75724 Paris Cedex 15, France
- CNRS UMR3523
- Institut Pasteur
| | - Laurence A. Mulard
- Institut Pasteur
- Unité de Chimie des Biomolécules
- 75724 Paris Cedex 15, France
- CNRS UMR3523
- Institut Pasteur
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5
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Champion E, André I, Mulard LA, Monsan P, Remaud-Siméon M, Morel S. Synthesis of L-Rhamnose andN-Acetyl-D-Glucosamine Derivatives Entering in the Composition of Bacterial Polysaccharides by Use of Glucansucrases. J Carbohydr Chem 2009. [DOI: 10.1080/07328300902755796] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Elise Champion
- a Université de Toulouse , INSA, UPS, INP, LISBP, 135 Avenue de Rangueil, F-31077, Toulouse, France
- b CNRS , UMR5504, F-31400, Toulouse, France
- c INRA, UMR792 Ingénierie des Systèmes Biologiques et des Procédés , F-31400, Toulouse, France
| | - Isabelle André
- a Université de Toulouse , INSA, UPS, INP, LISBP, 135 Avenue de Rangueil, F-31077, Toulouse, France
- b CNRS , UMR5504, F-31400, Toulouse, France
- c INRA, UMR792 Ingénierie des Systèmes Biologiques et des Procédés , F-31400, Toulouse, France
| | - Laurence A. Mulard
- d Institut Pasteur, Unité de Chimie des Biomolécules , CNRS URA 2128, 28 rue du Dr. Roux, F-75015, Paris, France
| | - Pierre Monsan
- a Université de Toulouse , INSA, UPS, INP, LISBP, 135 Avenue de Rangueil, F-31077, Toulouse, France
- b CNRS , UMR5504, F-31400, Toulouse, France
- c INRA, UMR792 Ingénierie des Systèmes Biologiques et des Procédés , F-31400, Toulouse, France
- e Institut Universitaire de France , 103 Boulevard Saint-Michel, F-75005, Paris, France
| | - Magali Remaud-Siméon
- a Université de Toulouse , INSA, UPS, INP, LISBP, 135 Avenue de Rangueil, F-31077, Toulouse, France
- b CNRS , UMR5504, F-31400, Toulouse, France
- c INRA, UMR792 Ingénierie des Systèmes Biologiques et des Procédés , F-31400, Toulouse, France
| | - Sandrine Morel
- a Université de Toulouse , INSA, UPS, INP, LISBP, 135 Avenue de Rangueil, F-31077, Toulouse, France
- b CNRS , UMR5504, F-31400, Toulouse, France
- c INRA, UMR792 Ingénierie des Systèmes Biologiques et des Procédés , F-31400, Toulouse, France
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Boutet J, Guerreiro C, Mulard LA. Efficient Synthesis of Six Tri- to Hexasaccharide Fragments of Shigella flexneri Serotypes 3a and/or X O-Antigen, Including a Study on Acceptors Containing N-Trichloroacetylglucosamine versus N-Acetylglucosamine. J Org Chem 2009; 74:2651-70. [DOI: 10.1021/jo802127z] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Julien Boutet
- Institut Pasteur, Unité de Chimie des Biomolécules (URA CNRS 2128), 28 rue du Dr Roux, F-75015 Paris, France
| | - Catherine Guerreiro
- Institut Pasteur, Unité de Chimie des Biomolécules (URA CNRS 2128), 28 rue du Dr Roux, F-75015 Paris, France
| | - Laurence A. Mulard
- Institut Pasteur, Unité de Chimie des Biomolécules (URA CNRS 2128), 28 rue du Dr Roux, F-75015 Paris, France
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7
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Boutet J, Mulard LA. Synthesis of Two Tetra- and Four Pentasaccharide Fragments ofShigella flexneriSerotypes 3a and X O-Antigens from a Common Tetrasaccharide Intermediate. European J Org Chem 2008. [DOI: 10.1002/ejoc.200800693] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Boutet J, Guerreiro C, Mulard LA. Synthesis of branched tri- to pentasaccharides representative of fragments of Shigella flexneri serotypes 3a and/or X O-antigens. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.08.080] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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9
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Costachel C, Sansonetti PJ, Mulard LA. Linear Synthesis of the Methyl Glycosides of Tetra- and Pentasaccharide Fragments Specific for the Shigella flexneri Serotype 2a O-Antigen. J Carbohydr Chem 2008. [DOI: 10.1080/07328300008544139] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Corina Costachel
- a Unité de Chimie Organique, BGM, and Unité de Pathogénie Microbienne Moléculaire, BGM, Institut Pasteur , 28 rue du Dr. Roux, 75724 Paris, Cedex 15, France
- b Unité de Chimie Organique, BGM, and Unité de Pathogénie Microbienne Moléculaire, BGM, Institut Pasteur , 28 rue du Dr. Roux, 75724 Paris, Cedex 15, France
- c Unité de Chimie Organique, BGM, and Unité de Pathogénie Microbienne Moléculaire, BGM, Institut Pasteur , 28 rue du Dr. Roux, 75724 Paris, Cedex 15, France
| | - Philippe J. Sansonetti
- a Unité de Chimie Organique, BGM, and Unité de Pathogénie Microbienne Moléculaire, BGM, Institut Pasteur , 28 rue du Dr. Roux, 75724 Paris, Cedex 15, France
- b Unité de Chimie Organique, BGM, and Unité de Pathogénie Microbienne Moléculaire, BGM, Institut Pasteur , 28 rue du Dr. Roux, 75724 Paris, Cedex 15, France
- c Unité de Chimie Organique, BGM, and Unité de Pathogénie Microbienne Moléculaire, BGM, Institut Pasteur , 28 rue du Dr. Roux, 75724 Paris, Cedex 15, France
| | - Laurence A. Mulard
- a Unité de Chimie Organique, BGM, and Unité de Pathogénie Microbienne Moléculaire, BGM, Institut Pasteur , 28 rue du Dr. Roux, 75724 Paris, Cedex 15, France
- b Unité de Chimie Organique, BGM, and Unité de Pathogénie Microbienne Moléculaire, BGM, Institut Pasteur , 28 rue du Dr. Roux, 75724 Paris, Cedex 15, France
- c Unité de Chimie Organique, BGM, and Unité de Pathogénie Microbienne Moléculaire, BGM, Institut Pasteur , 28 rue du Dr. Roux, 75724 Paris, Cedex 15, France
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Lemanski G, Ziegler T. Synthesis of Pentasaccharide Fragments Related to theO-Specific Polysaccharide ofShigella flexneri Serotype 1a. European J Org Chem 2006. [DOI: 10.1002/ejoc.200600078] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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11
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Clément MJ, Imberty A, Phalipon A, Pérez S, Simenel C, Mulard LA, Delepierre M. Conformational studies of the O-specific polysaccharide of Shigella flexneri 5a and of four related synthetic pentasaccharide fragments using NMR and molecular modeling. J Biol Chem 2003; 278:47928-36. [PMID: 12925526 DOI: 10.1074/jbc.m308259200] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
As part of a program for the development of synthetic vaccines against the pathogen Shigella flexneri, we used a combination of NMR and molecular modeling methods to study the conformations of the O-specific polysaccharide (O-SP) of S. flexneri 5a and of four related synthetic pentasaccharide fragments. The NMR study, based on the analysis of 1H and 13C chemical shifts, the evaluation of inter-residue distances, and the measurement of one- and three-bond heteronuclear coupling constants, showed that the conformation of one of the four pentasaccharides is similar to that of the native O-SP in solution. Interestingly, inhibition enzyme-linked immunosorbent assay demonstrated that a protective monoclonal antibody specific for S. flexneri 5a has a greater affinity for this pentasaccharide than for the others. We carried out a complete conformational search on the pentasaccharides using the CICADA algorithm interfaced with MM3 force field. We calculated Boltzmann-averaged inter-residue distances and 3JC,H coupling constants for the different conformational families and compared the results with NMR data for all pentasaccharides. Our experimental data are consistent with only one conformational family. We also used molecular modeling data to build models of the O-SP with the molecular builder program POLYS. The models that are in agreement with NMR data adopt right-handed 3-fold helical structures in which the branched glucosyl residue points outwards.
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Affiliation(s)
- Marie-Jeanne Clément
- Unité de RMN des Biomolécules, URA CNRS 2185, Institut Pasteur, 28 rue du Dr Roux, 75724 Paris, Cedex 15, France
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12
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Mukhopadhyay B, Roy N. Synthesis of the pentasaccharide related to the repeating unit of the antigen from Shigella dysenteriae type 4 in the form of its methyl ester 2-(trimethylsilyl)ethyl glycoside. Carbohydr Res 2003; 338:589-96. [PMID: 12644371 DOI: 10.1016/s0008-6215(02)00499-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Starting from D-mannose, D-glucose and L-fucose, the pentasaccharide derivative methyl 2,3,4-tri-O-benzyl-alpha-L-fucopyranosyl-(1-->3)-2-O-acetyl-4,6-O-benzylidene-alpha-D-mannopyranosyl-(1-->3)-2-O-acetyl-6-O-benzyl-4-O-(2,3,4-tri-O-benzyl-alpha-L-fucopyranosyl)-alpha-D-mannopyranosyl-(1-->4)-[2-(trimethylsilyl)ethyl 2,3-di-O-benzyl-beta-D-glucopyranosid]uronate was synthesized. This compound with two alpha-mannopyranosyl units was transformed, via Walden inversion and subsequent deprotection, into the alpha-D-glucosamine-type target compound, namely methyl alpha-L-fucopyranosyl-(1-->3)-2-acetamido-2-deoxy-alpha-D-glucopyranosyl-(1-->3)-2-acetamido-2-deoxy-4-O-(alpha-L-fucopyranosyl)-alpha-D-glucopyranosyl-(1-->4)-[2-(trimethylsilyl)ethyl beta-D-glucopyranosid]uronate which is related to the repeating unit of the O-antigen from Shigella dysenteriae type 4.
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Affiliation(s)
- Balaram Mukhopadhyay
- Department of Biological Chemistry, Indian Association for the Cultivation of Science, Jadavpur, 700 032, Calcutta, India
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Mulard LA, Clément MJ, Segat-Dioury F, Delepierre M. Synthesis and NMR study of a linear pentasaccharide fragment of the Shigella flexneri 5a O-specific polysaccharide. Tetrahedron 2002. [DOI: 10.1016/s0040-4020(02)00148-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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14
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Zhang M, Du Y, Kong F. Practical synthesis of a tetrasaccharide derivative corresponding to ristomycin A and ristocetin A. Carbohydr Res 2001; 330:319-24. [PMID: 11270810 DOI: 10.1016/s0008-6215(00)00303-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
A practical synthesis of fully benzoylated tetrasaccharide, whose free form is indispensable to the antibiotic ristomycin A for the process of dimerization and binding to the cell wall, was achieved via sequential assembly of the building blocks, allyl 3,4-di-O-benzoyl-alpha-D-glucopyranoside, 2,3,4-tri-O-benzoyl-alpha-L-rhamnopyranosyl trichloroacetimidate, 2-O-acetyl-3,4,6-tri-O-benzoyl-alpha-D-mannopyranosyl trichloroacetimidate, and 2,3,5-tri-O-benzoyl-alpha-D-arabinofuranosyl trichloroacetimidate. A one-pot preparation of allyl 3,4-di-O-benzoyl-2-O-tert-butyldimethylsilyl-6-O-triphenylmethyl-alpha-D-glucopyranoside is described, and regioselective glycosylation is carried out using perbenzoylated sugar trichloroacetimidates as glycosyl donors in the presence of a catalytic amount of trimethylsilyl trifluoromethanesulfonate (TMSOTf).
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Affiliation(s)
- M Zhang
- Research Center for Eco-Environmental Sciences, Academia Sinica, Beijing, People's Republic of China
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15
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Mulard LA, Ughetto-Monfrin J. First Synthesis of A Branched Pentasaccharide Representative of The Repeating Unit of TheShigella FlexneriSerotype 5AO-Antigen. J Carbohydr Chem 2000. [DOI: 10.1080/07328300008544074] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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16
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Mulard LA, Costachel C, Sansonetti PJ. Synthesis of the Methyl Glycosides of a Di- and Two Trisaccharide Fragments Specific for theShigella flexneriSerotype 2aO-Antigen. J Carbohydr Chem 2000. [DOI: 10.1080/07328300008544123] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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17
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Mulard LA, Ughetto-Monfrin J. Linear Synthesis of The Methyl Glycosides of Tri-, Tetra-, and Pentasaccharide Fragments of TheShigella FlexneriSerotype 5AO-Antigen. J Carbohydr Chem 2000. [DOI: 10.1080/07328300008544096] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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