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Scarpelli R, Bence R, Cano NCH, Procopio A, Wunderlin D, Nardi M. A Review on the Use of Deep Eutectic Solvents in Protection Reactions. Molecules 2024; 29:818. [PMID: 38398570 PMCID: PMC10893478 DOI: 10.3390/molecules29040818] [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: 11/28/2023] [Revised: 02/04/2024] [Accepted: 02/06/2024] [Indexed: 02/25/2024] Open
Abstract
Given the recent research on the application of eco-sustainable methods in organic chemistry, we have focused our attention on the derivatization processes for fundamental functional groups in organic chemistry, such as amino, hydroxyl and carbonyl groups. Protection reactions are needed to temporarily block a certain reactive site on a molecule. The use of green solvents in this context has made an excellent contribution to the development of eco-sustainable methods. In recent years, deep eutectic solvents (DESs) have had great success as a new class of green solvents used in various chemical applications, such as extraction or synthetic processes. These solvents are biodegradable and nontoxic. In this framework, a list of relevant works found in the literature is described, considering DESs to be a good alternative to classic toxic solvents in the protection reactions of important functional groups.
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Affiliation(s)
- Rosa Scarpelli
- Dipartimento di Scienze della Salute, Università Magna Græcia, Viale Europa, Germaneto, 88100 Catanzaro, Italy; (A.P.); (M.N.)
| | - Renata Bence
- ICYTAC, CONICET and Departamento Química Orgánica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, Bv. Juan Filloy s/n, Córdoba 5000, Argentina; (R.B.); (D.W.)
| | - Natividad Carolina Herrera Cano
- ICYTAC, CONICET and Departamento Química Orgánica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, Bv. Juan Filloy s/n, Córdoba 5000, Argentina; (R.B.); (D.W.)
| | - Antonio Procopio
- Dipartimento di Scienze della Salute, Università Magna Græcia, Viale Europa, Germaneto, 88100 Catanzaro, Italy; (A.P.); (M.N.)
| | - Daniel Wunderlin
- ICYTAC, CONICET and Departamento Química Orgánica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, Bv. Juan Filloy s/n, Córdoba 5000, Argentina; (R.B.); (D.W.)
| | - Monica Nardi
- Dipartimento di Scienze della Salute, Università Magna Græcia, Viale Europa, Germaneto, 88100 Catanzaro, Italy; (A.P.); (M.N.)
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2
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Arnodo D, De Nardo E, Ghinato S, Baldino S, Blangetti M, Prandi C. A Mild, Efficient and Sustainable Tetrahydropyranylation of Alcohols Promoted by Acidic Natural Deep Eutectic Solvents. CHEMSUSCHEM 2023; 16:e202202066. [PMID: 36459165 DOI: 10.1002/cssc.202202066] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2022] [Revised: 12/01/2022] [Indexed: 06/17/2023]
Abstract
A straightforward protocol to promote the tetrahydropyranylation of alcohols, using for the first time bioinspired acidic natural deep eutectic solvents (NADESs) as non-innocent reaction media under mild reaction conditions, was reported. This approach enables the preparation of several tetrahydropyranyl (THP) ethers starting from primary, secondary and tertiary alcohols in short reaction times and with high levels of chemoselectivity, working under air and without the need of additional catalyst. The sustainability of the methodology was further highlighted by its scalability and the easy recyclability of the NADES, allowing multigram preparations of THP ethers without any loss of the catalytic activity of the reaction media up to ten recycling steps. Telescoped, one-pot tetrahydropyranylation/nucleophilic acyl substitution transformations using the same eutectic mixture were also demonstrated.
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Affiliation(s)
- Davide Arnodo
- Dipartimento di Chimica, Università degli Studi di Torino, Via Pietro Giuria 7, I-10125, Torino, Italy
| | - Eugenio De Nardo
- Dipartimento di Chimica, Università degli Studi di Torino, Via Pietro Giuria 7, I-10125, Torino, Italy
| | - Simone Ghinato
- Dipartimento di Chimica, Università degli Studi di Torino, Via Pietro Giuria 7, I-10125, Torino, Italy
| | - Salvatore Baldino
- Dipartimento di Chimica, Università degli Studi di Torino, Via Pietro Giuria 7, I-10125, Torino, Italy
| | - Marco Blangetti
- Dipartimento di Chimica, Università degli Studi di Torino, Via Pietro Giuria 7, I-10125, Torino, Italy
| | - Cristina Prandi
- Dipartimento di Chimica, Università degli Studi di Torino, Via Pietro Giuria 7, I-10125, Torino, Italy
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3
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Khanam A, Kumar Mandal P. Influence of Remote Picolinyl and Picoloyl Stereodirecting Groups for the Stereoselective Glycosylation. ASIAN J ORG CHEM 2020. [DOI: 10.1002/ajoc.202000558] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Ariza Khanam
- Medicinal and Process Chemistry Division CSIR-Central Drug Research Institute Sector 10, Jankipuram extn., Sitapur Road Lucknow 226 031 India
| | - Pintu Kumar Mandal
- Medicinal and Process Chemistry Division CSIR-Central Drug Research Institute Sector 10, Jankipuram extn., Sitapur Road Lucknow 226 031 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India
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4
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Villameriel JM, Pedersen CM. Conformational Lock of Glycosyl Donors Using Cyclic Carbamates. European J Org Chem 2020. [DOI: 10.1002/ejoc.202001130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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5
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Janssens J, Risseeuw MDP, Van der Eycken J, Van Calenbergh S. Regioselective Ring Opening of 1,3-Dioxane-Type Acetals in Carbohydrates. European J Org Chem 2018. [DOI: 10.1002/ejoc.201801245] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Jonas Janssens
- Laboratory for Medicinal Chemistry; Department of Pharmaceutics (FFW); Ghent University; Ottergemsesteenweg 460 9000 Ghent Belgium
- Laboratory for Organic and Bioorganic Synthesis; Department of Organic and Macromolecular Chemistry; Ghent University; Krijgslaan 281 (S4) 9000 Ghent Belgium
| | - Martijn D. P. Risseeuw
- Laboratory for Medicinal Chemistry; Department of Pharmaceutics (FFW); Ghent University; Ottergemsesteenweg 460 9000 Ghent Belgium
| | - Johan Van der Eycken
- Laboratory for Organic and Bioorganic Synthesis; Department of Organic and Macromolecular Chemistry; Ghent University; Krijgslaan 281 (S4) 9000 Ghent Belgium
| | - Serge Van Calenbergh
- Laboratory for Medicinal Chemistry; Department of Pharmaceutics (FFW); Ghent University; Ottergemsesteenweg 460 9000 Ghent Belgium
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6
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Imamura A. Di-<i>tert</i>-butylsilylene (DTBS)-Directed Stereoselective Glycosylations. TRENDS GLYCOSCI GLYC 2018. [DOI: 10.4052/tigg.1811.2j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- Akihiro Imamura
- Department of Applied Bio-organic Chemistry, Faculty of Applied Biological Sciences, Gifu University
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7
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8
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Yagami N, Tamai H, Udagawa T, Ueki A, Konishi M, Imamura A, Ishida H, Kiso M, Ando H. A 1,2-trans
-Selective Glycosyl Donor Bearing Cyclic Protection at the C-2 and C-3 Hydroxy Groups. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700671] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Nahoko Yagami
- Department of Applied Bioorganic Chemistry; Faculty of Applied Biological Sciences; Gifu University; 1-1 Yanagido 501-1193 Gifu-shi, Gifu Japan
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS); Kyoto University; Yoshida Ushinomiya-cho 606-8501 Sakyo-ku, Kyoto Japan
| | - Hideki Tamai
- Department of Applied Bioorganic Chemistry; Faculty of Applied Biological Sciences; Gifu University; 1-1 Yanagido 501-1193 Gifu-shi, Gifu Japan
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS); Kyoto University; Yoshida Ushinomiya-cho 606-8501 Sakyo-ku, Kyoto Japan
| | - Taro Udagawa
- Department of Chemistry and Biomolecular Science; Faculty of Engineering; Gifu University; 1-1 Yanagido 501-1193 Gifu-shi, Gifu Japan
| | - Akiharu Ueki
- Department of Applied Bioorganic Chemistry; Faculty of Applied Biological Sciences; Gifu University; 1-1 Yanagido 501-1193 Gifu-shi, Gifu Japan
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS); Kyoto University; Yoshida Ushinomiya-cho 606-8501 Sakyo-ku, Kyoto Japan
| | - Miku Konishi
- Department of Applied Bioorganic Chemistry; Faculty of Applied Biological Sciences; Gifu University; 1-1 Yanagido 501-1193 Gifu-shi, Gifu Japan
- Center for Highly Advanced Integration of Nano and Life Sciences (G-CHAIN); Gifu University; 1-1 Yanagido 501-1193 Gifu-shi, Gifu Japan
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS); Kyoto University; Yoshida Ushinomiya-cho 606-8501 Sakyo-ku, Kyoto Japan
| | - Akihiro Imamura
- Department of Applied Bioorganic Chemistry; Faculty of Applied Biological Sciences; Gifu University; 1-1 Yanagido 501-1193 Gifu-shi, Gifu Japan
| | - Hideharu Ishida
- Department of Applied Bioorganic Chemistry; Faculty of Applied Biological Sciences; Gifu University; 1-1 Yanagido 501-1193 Gifu-shi, Gifu Japan
- Center for Highly Advanced Integration of Nano and Life Sciences (G-CHAIN); Gifu University; 1-1 Yanagido 501-1193 Gifu-shi, Gifu Japan
| | - Makoto Kiso
- Department of Applied Bioorganic Chemistry; Faculty of Applied Biological Sciences; Gifu University; 1-1 Yanagido 501-1193 Gifu-shi, Gifu Japan
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS); Kyoto University; Yoshida Ushinomiya-cho 606-8501 Sakyo-ku, Kyoto Japan
| | - Hiromune Ando
- Department of Applied Bioorganic Chemistry; Faculty of Applied Biological Sciences; Gifu University; 1-1 Yanagido 501-1193 Gifu-shi, Gifu Japan
- Center for Highly Advanced Integration of Nano and Life Sciences (G-CHAIN); Gifu University; 1-1 Yanagido 501-1193 Gifu-shi, Gifu Japan
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS); Kyoto University; Yoshida Ushinomiya-cho 606-8501 Sakyo-ku, Kyoto Japan
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9
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Li F, Wang X, Li H, Wang S, Xue W, Wang Y. The Induction Period and Novel Active Species in Zn(OAc)2 Catalyzed Synthesis of Aromatic Carbamates. Catal Letters 2017. [DOI: 10.1007/s10562-017-2055-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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10
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Imamura A, Matsuzawa N, Sakai S, Udagawa T, Nakashima S, Ando H, Ishida H, Kiso M. The Origin of High Stereoselectivity in Di-tert-butylsilylene-Directed α-Galactosylation. J Org Chem 2016; 81:9086-9104. [DOI: 10.1021/acs.joc.6b01685] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Akihiro Imamura
- Department
of Applied Bio-organic Chemistry, Faculty of Applied Biological Sciences, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
| | - Naomi Matsuzawa
- Department
of Applied Bio-organic Chemistry, Faculty of Applied Biological Sciences, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
| | - Shizuo Sakai
- Department
of Applied Bio-organic Chemistry, Faculty of Applied Biological Sciences, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
| | - Taro Udagawa
- Department
of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
| | - Shinya Nakashima
- Department
of Applied Bio-organic Chemistry, Faculty of Applied Biological Sciences, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
| | - Hiromune Ando
- Department
of Applied Bio-organic Chemistry, Faculty of Applied Biological Sciences, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
- Institute
for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Yoshida
Ushinomiya-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Hideharu Ishida
- Department
of Applied Bio-organic Chemistry, Faculty of Applied Biological Sciences, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
| | - Makoto Kiso
- Department
of Applied Bio-organic Chemistry, Faculty of Applied Biological Sciences, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
- Institute
for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Yoshida
Ushinomiya-cho, Sakyo-ku, Kyoto 606-8501, Japan
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11
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Dharuman S, Crich D. Determination of the Influence of Side-Chain Conformation on Glycosylation Selectivity using Conformationally Restricted Donors. Chemistry 2016; 22:4535-42. [PMID: 26880055 PMCID: PMC4792696 DOI: 10.1002/chem.201505019] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2015] [Indexed: 01/28/2023]
Abstract
The synthesis of a series of conformationally locked mannopyranosyl thioglycosides in which the C6-O6 bond adopts either the gauche,gauche, gauche,trans, or trans,gauche conformation is described, and their influence on glycosylation stereoselectivity investigated. Two 4,6-O-benzylidene-protected mannosyl thioglycosides carrying axial or equatorial methyl groups at the 6-position were also synthesized and the selectivity of their glycosylation reactions studied to enable a distinction to be made between steric and stereoelectronic effects. The presence of an axial methoxy group at C6 in the bicyclic donor results in a decreased preference for formation of the β-mannoside, whereas an axial methyl group has little effect on selectivity. The result is rationalized in terms of through-space stabilization of a transient intermediate oxocarbenium ion by the axial methoxy group resulting in a higher degree of SN 1-like character in the glycosylation reaction. Comparisons are made with literature examples and exceptions are discussed in terms of pervading steric effects layered on top of the basic stereoelectronic effect.
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Affiliation(s)
- Suresh Dharuman
- Department of Chemistry, Wayne State University, Detroit, MI, 48202, USA
| | - David Crich
- Department of Chemistry, Wayne State University, Detroit, MI, 48202, USA.
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12
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Herczeg M, Demeter F, Mező E, Pap M, Borbás A. Simultaneous Application of Arylmethylene Acetal and Butane Diacetal Groups for Protection of Hexopyranosides: Synthesis and Chemoselective Ring-Opening Reactions. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500732] [Citation(s) in RCA: 8] [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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13
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Bhaumik A, Pal TK, Pathak T. 1,1-Dioxothiomorpholines with asymmetric environments: protecting group directed diastereoselectivity of glyco divinyl sulfone cyclization. RSC Adv 2015. [DOI: 10.1039/c5ra03276h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Formation of 1,1-dioxothiomorpholines from divinyl sulfone-modified pyranosides dramatically varied when benzylidene protection is replaced by benzyl protecting groups.
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Affiliation(s)
- Atanu Bhaumik
- Department of Chemistry
- Indian Institute of Technology Kharagpur
- Kharagpur 721302
- India
| | - Tarun Kumar Pal
- Department of Chemistry
- Indian Institute of Technology Kharagpur
- Kharagpur 721302
- India
| | - Tanmaya Pathak
- Department of Chemistry
- Indian Institute of Technology Kharagpur
- Kharagpur 721302
- India
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14
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Balmond EI, Benito-Alifonso D, Coe DM, Alder RW, McGarrigle EM, Galan MC. A 3,4-trans-fused cyclic protecting group facilitates α-selective catalytic synthesis of 2-deoxyglycosides. Angew Chem Int Ed Engl 2014; 53:8190-4. [PMID: 24953049 PMCID: PMC4499252 DOI: 10.1002/anie.201403543] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Indexed: 11/09/2022]
Abstract
A practical approach has been developed to convert glucals and rhamnals into disaccharides or glycoconjugates with high α-selectivity and yields (77-97%) using a trans-fused cyclic 3,4-O-disiloxane protecting group and TsOH⋅H2O (1 mol%) as a catalyst. Control of the anomeric selectivity arises from conformational locking of the intermediate oxacarbenium cation. Glucals outperform rhamnals because the C6 side-chain conformation augments the selectivity.
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Affiliation(s)
- Edward I Balmond
- School of Chemistry, University of Bristol, Cantock's CloseBristol BS8 1TS (UK)
| | | | - Diane M Coe
- GlaxoSmithKline Medicines Research CentreGunnels Wood Road, Stevenage SG1 2NY (UK)
| | - Roger W Alder
- School of Chemistry, University of Bristol, Cantock's CloseBristol BS8 1TS (UK)
| | - Eoghan M McGarrigle
- Centre for Synthesis and Chemical Biology, UCD School of Chemistry & Chemical Biology, University College DublinBelfield, Dublin 4 (Ireland)
| | - M Carmen Galan
- School of Chemistry, University of Bristol, Cantock's CloseBristol BS8 1TS (UK)
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15
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Balmond EI, Benito-Alifonso D, Coe DM, Alder RW, McGarrigle EM, Galan MC. A 3,4-trans-Fused Cyclic Protecting Group Facilitates α-Selective Catalytic Synthesis of 2-Deoxyglycosides. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201403543] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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16
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Komarova BS, Orekhova MV, Tsvetkov YE, Nifantiev NE. Is an acyl group at O-3 in glucosyl donors able to control α-stereoselectivity of glycosylation? The role of conformational mobility and the protecting group at O-6. Carbohydr Res 2013; 384:70-86. [PMID: 24368161 DOI: 10.1016/j.carres.2013.11.016] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2013] [Revised: 11/21/2013] [Accepted: 11/23/2013] [Indexed: 11/28/2022]
Abstract
The stereodirecting effect of a 3-O-acetyl protecting group, which is potentially capable of the remote anchimeric participation, and other protecting groups in 2-O-benzyl glucosyl donors with flexible and rigid conformations has been investigated. To this aim, an array of N-phenyltrifluoroacetimidoyl and sulfoxide donors bearing either 3-O-acetyl or 3-O-benzyl groups in combination with 4,6-di-O-benzyl, 6-O-acyl-4-O-benzyl, or 4,6-O-benzylidene protecting groups was prepared. The conformationally flexible 3-O-acetylated glucosyl donor protected at other positions with O-benzyl groups demonstrated very low or no α-stereoselectivity upon glycosylation of primary or secondary acceptors. On the contrary, 3,6-di-O-acylated glucosyl donors proved to be highly α-stereoselective as well as the donor having a single potentially participating acetyl group at O-6. The 3,6-di-O-acylated donor was shown to be the best α-glucosylating block for the primary acceptor, whereas the best α-selectivity of glycosylation of the secondary acceptor was achieved with the 6-O-acylated donor. Glycosylation of the secondary acceptor with the conformationally constrained 3-O-acetyl-4,6-O-benzylidene-protected donor displayed under standard conditions (-35°C) even lower α-selectivity as compared to the 3-O-benzyl analogue. However, increasing the reaction temperature essentially raised the α-stereoselectivities of glycosylation with both 3-O-acetyl and 3-O-benzyl donors and made them almost equal. The stereodirecting effects of protecting groups observed for N-phenyltrifluoroacetimidoyl donors were also generally proven for sulfoxide donors.
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Affiliation(s)
- Bozhena S Komarova
- Laboratory of Glycoconjugate Chemistry, N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, 119991 Moscow, Russia
| | - Maria V Orekhova
- Laboratory of Glycoconjugate Chemistry, N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, 119991 Moscow, Russia
| | - Yury E Tsvetkov
- Laboratory of Glycoconjugate Chemistry, N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, 119991 Moscow, Russia
| | - Nikolay E Nifantiev
- Laboratory of Glycoconjugate Chemistry, N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, 119991 Moscow, Russia.
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Adak AK, Yu CC, Liang CF, Lin CC. Synthesis of sialic acid-containing saccharides. Curr Opin Chem Biol 2013; 17:1030-8. [PMID: 24182749 DOI: 10.1016/j.cbpa.2013.10.013] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2013] [Revised: 10/07/2013] [Accepted: 10/08/2013] [Indexed: 11/25/2022]
Abstract
Sialic acids are a diverse family of negatively charged monosaccharides with a shared nine-carbon carboxylated backbone, and they often serve as the terminal positions of cell surface glycoproteins and glycolipids. Sialic acids play essential roles in mediating or modulating numerous pathological, biological, and immunological recognition events. Advances in synthesis have provided chemically well-defined and structurally homogeneous sialic acid-containing carbohydrates that are crucial for studying glycobiology. This review highlights recent innovations in the chemical and chemoenzymatic synthesis of difficult α-sialosides, with a particular focus on methods developed for α-selective sialylation in the synthesis of O-linked and S-linked oligosialic acids.
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Affiliation(s)
- Avijit K Adak
- Department of Chemistry, National Tsing Hua University, Hsinchu 300, Taiwan
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18
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Moumé-Pymbock M, Furukawa T, Mondal S, Crich D. Probing the influence of a 4,6-O-acetal on the reactivity of galactopyranosyl donors: verification of the disarming influence of the trans-gauche conformation of C5-C6 bonds. J Am Chem Soc 2013; 135:14249-55. [PMID: 23984633 PMCID: PMC3814037 DOI: 10.1021/ja405588x] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The effect of a 4,6-O-alkylidene acetal on the rate of acid-catalyzed hydrolysis of methyl galactopyranosides and of spontaneous hydrolysis of 2,4-dinitrophenyl galactopyranosides has been studied through the synthesis and hydrolysis of analogs in which O6 is replaced by a methoxymethylene unit in which the methoxy group adopts either an equatorial or an axial position according to the configuration. Consistent with earlier studies under both acid-catalyzed and spontaneous hydrolysis conditions, the alkylidene acetal, or its 7-carba analog, retards hydrolysis with respect to comparable systems lacking the cyclic protecting group. The configuration at C6 in the 7-carba analogs does not influence the rate of acid-catalyzed hydrolysis but has a minor influence on the rate of spontaneous hydrolysis of the 2,4-dinitrophenyl galactosides, confirming earlier studies on the role played by the hydroxymethyl group conformation on glycoside reactivity. The benzylidene acetal is found to stabilize the α-anomer of galactopyranose derivatives relative to monocyclic analogs. Reasons for the α-selectivity of 4,6-O-benzylidene-protected galactopyranosyl donors bearing neighboring group-active protecting groups at O2 are discussed.
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Affiliation(s)
- Myriame Moumé-Pymbock
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, MI 48202
| | - Takayuki Furukawa
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, MI 48202
| | - Sujit Mondal
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, MI 48202
| | - David Crich
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, MI 48202
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19
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Lin HJ, Adak AK, Reddy LVR, Wu SH, Lin CC. Total Synthesis of an Immunomodulatory Phosphoglycolipid from Thermophilic Bacteria. Chemistry 2013; 19:7989-98. [DOI: 10.1002/chem.201204550] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Revised: 03/18/2013] [Indexed: 01/08/2023]
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20
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Kancharla PK, Navuluri C, Crich D. Dissecting the influence of oxazolidinones and cyclic carbonates in sialic acid chemistry. Angew Chem Int Ed Engl 2012; 51:11105-9. [PMID: 22976809 PMCID: PMC3489474 DOI: 10.1002/anie.201204400] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2012] [Revised: 08/02/2012] [Indexed: 11/11/2022]
Abstract
At a moment's notice: Thermal equilibration of 1 and mass spectral analysis of sialyl phosphates suggest that the 4O,5N-oxazolidinone and the 4,5-O-carbonate systems influence the anomeric effect and the mechanisms of sialidation by virtue of their dipole moment in the mean plane of the pyranose ring. The electron-withdrawing effect destabilizes 2 and promotes associative glycosylation mechanisms. TEMPO = 2,2,6,6-tetramethylpiperidine N-oxide.
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Affiliation(s)
- Pavan K Kancharla
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, MI 48202, USA
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Kancharla PK, Navuluri C, Crich D. Dissecting the Influence of Oxazolidinones and Cyclic Carbonates in Sialic Acid Chemistry. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201204400] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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22
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Sharma I, Bohé L, Crich D. Influence of protecting groups on the anomeric equilibrium; case of the 4,6-O-benzylidene acetal in the mannopyranose series. Carbohydr Res 2012; 357:126-31. [PMID: 22739244 PMCID: PMC3396728 DOI: 10.1016/j.carres.2012.05.025] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2012] [Revised: 05/25/2012] [Accepted: 05/28/2012] [Indexed: 11/29/2022]
Abstract
It is reported that the replacement of the 4- and 6-O-benzyl ethers in 2,3,4,6-tetra-O-benzyl-α,β-mannopyranose by a 4,6-O-benzylidene acetal results in an increased population of the β-anomer at equilibrium in CDCl(3) solution. The phenomenon is considered to arise from the lower steric bulk of the benzylidene acetal that, through diminished buttressing interactions, reduces steric interactions normally present in the β-anomer.
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Affiliation(s)
- Indrajeet Sharma
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, MI 48202, USA
| | - Luis Bohé
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, 1 Avenue de la Terrasse, 91190 Gif-sur-Yvette, France
| | - David Crich
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, MI 48202, USA
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, 1 Avenue de la Terrasse, 91190 Gif-sur-Yvette, France
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23
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Enugala R, Carvalho LCR, Dias Pires MJ, Marques MMB. Stereoselective Glycosylation of Glucosamine: The Role of the
N
‐Protecting Group. Chem Asian J 2012; 7:2482-501. [DOI: 10.1002/asia.201200338] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2012] [Indexed: 12/17/2022]
Affiliation(s)
- Ramu Enugala
- Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Campus de Caparica 2829‐516 Caparica (Portugal), Fax: (+351) 21‐294‐8550
| | - Luísa C. R. Carvalho
- Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Campus de Caparica 2829‐516 Caparica (Portugal), Fax: (+351) 21‐294‐8550
| | - Marina J. Dias Pires
- Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Campus de Caparica 2829‐516 Caparica (Portugal), Fax: (+351) 21‐294‐8550
| | - M. Manuel B. Marques
- Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Campus de Caparica 2829‐516 Caparica (Portugal), Fax: (+351) 21‐294‐8550
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24
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Fascione MA, Kilner CA, Leach AG, Turnbull WB. Do glycosyl sulfonium ions engage in neighbouring-group participation? A study of oxathiane glycosyl donors and the basis for their stereoselectivity. Chemistry 2011; 18:321-33. [PMID: 22140005 DOI: 10.1002/chem.201101889] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2011] [Indexed: 11/08/2022]
Abstract
Neighbouring-group participation has long been used to control the synthesis of 1,2-trans-glycosides. More recently there has been a growing interest in the development of similar strategies for the synthesis of 1,2-cis-glycosides, in particular the use of auxiliary groups that generate sulfonium ion intermediates. However, there has been some debate over the role of sulfonium ion intermediates in these reactions: do sulfonium ions actually engage in neighbouring-group participation, or are they a resting state of the system prior to reaction through an oxacarbenium ion intermediate? Herein, we describe the reactivities and stereoselectivities of a family of bicyclic thioglycosides in which an oxathiane ring is fused to the sugar to form a trans-decalin-like structure. A methyl sulfonium ion derived from one such glycosyl donor is so stable that it can be crystallised from ethanol, yet it reacts with complete stereoselectivity at high temperature. The importance of a ketal group in the oxathiane ring for maintaining this high stereoselectivity is investigated using a combination of experiment and ab initio calculations. The data are discussed in terms of S(N)1 and S(N)2 type mechanisms. Trends in stereoselectivity across a series of compounds are more consistent with selective addition to oxacarbenium ions rather than a shift between S(N)1 and S(N)2 mechanisms.
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25
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Hsu CH, Hung SC, Wu CY, Wong CH. Toward automated oligosaccharide synthesis. Angew Chem Int Ed Engl 2011; 50:11872-923. [PMID: 22127846 DOI: 10.1002/anie.201100125] [Citation(s) in RCA: 205] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2011] [Indexed: 12/16/2022]
Abstract
Carbohydrates have been shown to play important roles in biological processes. The pace of development in carbohydrate research is, however, relatively slow due to the problems associated with the complexity of carbohydrate structures and the lack of general synthetic methods and tools available for the study of this class of biomolecules. Recent advances in synthesis have demonstrated that many of these problems can be circumvented. In this Review, we describe the methods developed to tackle the problems of carbohydrate-mediated biological processes, with particular focus on the issue related to the development of the automated synthesis of oligosaccharides. Further applications of carbohydrate microarrays and vaccines to human diseases are also highlighted.
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Affiliation(s)
- Che-Hsiung Hsu
- The Genomics Research Center, Academia Sinica, Taipei, Taiwan
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26
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Hsu CH, Hung SC, Wu CY, Wong CH. Auf dem Weg zur automatisierten Oligosaccharid- Synthese. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201100125] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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27
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Crich D. Methodology development and physical organic chemistry: a powerful combination for the advancement of glycochemistry. J Org Chem 2011; 76:9193-209. [PMID: 21919522 PMCID: PMC3215858 DOI: 10.1021/jo2017026] [Citation(s) in RCA: 98] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
This Perspective outlines work in the Crich group on the diastereoselective synthesis of the so-called difficult classes of glycosidic bond: the 2-deoxy-β-glycopyranosides, the β-mannopyranosides, the α-sialosides, the α-glucopyranosides, and the β-arabinofuranosides with an emphasis on the critical interplay between mechanism and methodology development.
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Affiliation(s)
- David Crich
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, USA.
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28
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Grayson EJ, Bernardes GJL, Chalker JM, Boutureira O, Koeppe JR, Davis BG. A Coordinated Synthesis and Conjugation Strategy for the Preparation of Homogeneous Glycoconjugate Vaccine Candidates. Angew Chem Int Ed Engl 2011; 50:4127-32. [DOI: 10.1002/anie.201006327] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2010] [Revised: 01/05/2011] [Indexed: 12/26/2022]
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29
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Grayson EJ, Bernardes GJL, Chalker JM, Boutureira O, Koeppe JR, Davis BG. A Coordinated Synthesis and Conjugation Strategy for the Preparation of Homogeneous Glycoconjugate Vaccine Candidates. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201006327] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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30
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Codée JD, Ali A, Overkleeft HS, van der Marel GA. Novel protecting groups in carbohydrate chemistry. CR CHIM 2011. [DOI: 10.1016/j.crci.2010.05.010] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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31
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Crich D, Sharma I. Influence of the O3 protecting group on stereoselectivity in the preparation of C-mannopyranosides with 4,6-O-benzylidene protected donors. J Org Chem 2010; 75:8383-91. [PMID: 21070063 DOI: 10.1021/jo101453y] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
α-C-Glucopyranosides and mannopyranosides are obtained in 65-85% yields from 4,6-O-benzylidene-protected glucosyl and mannosyl thioglycosides bearing ester functionality at the 3-O-position by a coupling reaction with C-nucleophiles on activation with diphenyl sulfoxide, 2,4,6-tri-tert-butylpyrimidine, and trifluoromethanesulfonic anhydride.
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Affiliation(s)
- David Crich
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, Avenue de la Terrasse, 91198 Gif-sur-Yvette, France.
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32
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Guo J, Ye XS. Protecting groups in carbohydrate chemistry: influence on stereoselectivity of glycosylations. Molecules 2010; 15:7235-65. [PMID: 20966873 PMCID: PMC6259426 DOI: 10.3390/molecules15107235] [Citation(s) in RCA: 120] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2010] [Accepted: 10/15/2010] [Indexed: 11/16/2022] Open
Abstract
Saccharides are polyhydroxy compounds, and their synthesis requires complex protecting group manipulations. Protecting groups are usually used to temporarily mask a functional group which may interfere with a certain reaction, but protecting groups in carbohydrate chemistry do more than protecting groups usually do. Particularly, protecting groups can participate in reactions directly or indirectly, thus affecting the stereochemical outcomes, which is important for synthesis of oligosaccharides. Herein we present an overview of recent advances in protecting groups influencing stereoselectivity in glycosylation reactions, including participating protecting groups, and conformation-constraining protecting groups in general.
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Affiliation(s)
| | - Xin-Shan Ye
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +86 10-82801570; Fax: +86-10-62014949
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33
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Li Z. Computational study of the influence of cyclic protecting groups in stereoselectivity of glycosylation reactions. Carbohydr Res 2010; 345:1952-7. [DOI: 10.1016/j.carres.2010.06.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2010] [Revised: 06/07/2010] [Accepted: 06/14/2010] [Indexed: 11/30/2022]
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34
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Crich D, Navuluri C. Stereoselective synthesis of alpha-keto-deoxy-D-glycero-D-galacto-nonulosonic acid glycosides by means of the 4,5-O-carbonate protecting group. Angew Chem Int Ed Engl 2010; 49:3049-52. [PMID: 20333634 DOI: 10.1002/anie.200907178] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- David Crich
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, MI 48202, USA.
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35
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Boutureira O, Rodríguez MA, Díaz Y, Matheu MI, Castillón S. Studies on the Zn(II)-mediated electrophilic selenocyclization and elimination of 3,4-O-isopropylidene-protected hydroxyalkenyl sulfides: synthesis of a 2-phenylselenenyl glycal. Carbohydr Res 2010; 345:1041-5. [PMID: 20381018 DOI: 10.1016/j.carres.2010.03.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2010] [Revised: 02/17/2010] [Accepted: 03/01/2010] [Indexed: 11/16/2022]
Abstract
Herein, we describe a mild and efficient Zn(II)-mediated electrophilic selenocyclization reaction of readily available and stable 3,4-O-isopropylidene-protected hydroxyalkenyl sulfides to 2-deoxy-2-phenylselenenyl-1-thio-glycosides. This material was transformed into a 2-phenylselenenyl glycal in a controlled manner using an activation-elimination sequence.
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Affiliation(s)
- Omar Boutureira
- Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili, C/Marcel.lí Domingo s/n, 43007 Tarragona, Spain.
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36
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Joined use of oxazolidinone and desymmetric amino protection: a new strategy for protection of glucosamine. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.02.021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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37
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Crich D, Navuluri C. Stereoselective Synthesis of α-Keto-deoxy-D-glycero-D-galacto-nonulosonic Acid Glycosides by Means of the 4,5-O-Carbonate Protecting Group. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.200907178] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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38
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Castilla J, Marín I, Matheu MI, Díaz Y, Castillón S. Short and General Procedure for Synthesizing Cis-1,2-Fused 1,3-Oxathiolan-, 1,3-Oxaselenolan-, and 1,3-Oxazolidin-2-imine Carbohydrate Derivatives. J Org Chem 2009; 75:514-7. [DOI: 10.1021/jo9023649] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Javier Castilla
- Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili, C/ Marcel•lí Domingo s/n, 43007 Tarragona, Spain
| | - Irene Marín
- Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili, C/ Marcel•lí Domingo s/n, 43007 Tarragona, Spain
| | - M. Isabel Matheu
- Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili, C/ Marcel•lí Domingo s/n, 43007 Tarragona, Spain
| | - Yolanda Díaz
- Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili, C/ Marcel•lí Domingo s/n, 43007 Tarragona, Spain
| | - Sergio Castillón
- Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili, C/ Marcel•lí Domingo s/n, 43007 Tarragona, Spain
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39
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López JC, Ventura J, Uriel C, Gómez AM, Fraser-Reid B. Reaction of 1,2-Orthoesters with HF−Pyridine: A Method for the Preparation of Partly Unprotected Glycosyl Fluorides and Their Use in Saccharide Synthesis. Org Lett 2009; 11:4128-31. [DOI: 10.1021/ol901630d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- J. Cristóbal López
- Instituto de Química Orgánica General (CSIC), Juan de la Cierva 3, 28006 Madrid, Spain, and Natural Products and Glycotechnology Research Institute Inc. (NPG), 595F Weathersfield Road, Pittsboro, North Carolina 27312
| | - Juan Ventura
- Instituto de Química Orgánica General (CSIC), Juan de la Cierva 3, 28006 Madrid, Spain, and Natural Products and Glycotechnology Research Institute Inc. (NPG), 595F Weathersfield Road, Pittsboro, North Carolina 27312
| | - Clara Uriel
- Instituto de Química Orgánica General (CSIC), Juan de la Cierva 3, 28006 Madrid, Spain, and Natural Products and Glycotechnology Research Institute Inc. (NPG), 595F Weathersfield Road, Pittsboro, North Carolina 27312
| | - Ana M. Gómez
- Instituto de Química Orgánica General (CSIC), Juan de la Cierva 3, 28006 Madrid, Spain, and Natural Products and Glycotechnology Research Institute Inc. (NPG), 595F Weathersfield Road, Pittsboro, North Carolina 27312
| | - Bert Fraser-Reid
- Instituto de Química Orgánica General (CSIC), Juan de la Cierva 3, 28006 Madrid, Spain, and Natural Products and Glycotechnology Research Institute Inc. (NPG), 595F Weathersfield Road, Pittsboro, North Carolina 27312
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40
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Codée JD, de Jong AR, Dinkelaar J, Overkleeft HS, van der Marel GA. Stereoselectivity of glycosylations of conformationally restricted mannuronate esters. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.02.067] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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41
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42
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43
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Fascione MA, Adshead SJ, Stalford SA, Kilner CA, Leach AG, Turnbull WB. Stereoselective glycosylation using oxathiane glycosyl donors. Chem Commun (Camb) 2009:5841-3. [DOI: 10.1039/b913308a] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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44
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López Ó, Zafra E, Maya I, Fuentes J, Diánez MJ, Estrada MD, Pérez-Garrido S, Fernández-Bolaños JG. cis-Fused bicyclic sugar thiocarbamates. Reactivity towards amines. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.09.093] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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45
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Crich D, Sharma I. Is donor-acceptor hydrogen bonding necessary for 4,6-O-benzylidene-directed beta-mannopyranosylation? Stereoselective synthesis of beta-C-mannopyranosides and alpha-C-glucopyranosides. Org Lett 2008; 10:4731-4. [PMID: 18826233 PMCID: PMC2726931 DOI: 10.1021/ol8017038] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
2,3-Di-O-benzyl-4,6-O-benzylidene-thiohexopyranosides, on activation with 1-benzenesulfinyl piperidine and triflic anhydride, react with allyl silanes and stannanes, and with silyl enolethers to give C-glycosides. In the mannose series the beta-isomers are formed selectively whereas the glucose series provides the alpha-anomers. This selectivity pattern parallels that of O-glycoside formation and eliminates the need to consider donor-acceptor hydrogen bonding in the formation of the O-glycosides.
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Affiliation(s)
- David Crich
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, USA.
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46
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López JC, Bernal-Albert P, Uriel C, Gómez AM. Ready Transformation of Partially Unprotected Thioglycosides into Glycosyl Fluorides Mediated by NIS/HF-Pyridine or Et3N·3HF. European J Org Chem 2008. [DOI: 10.1002/ejoc.200800754] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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47
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McGarvey GJ, LeClair CA, Schmidtmann BA. Studies on the stereoselective synthesis of C-allyl glycosides. Org Lett 2008; 10:4727-30. [PMID: 18826234 DOI: 10.1021/ol801710s] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An investigation was carried out to explore the use of sulfoxide donors as common precursors to stereoisomeric C-glycoconjugates of glycoprotein and glycolipid tumor antigens. A study focusing on the effects of reaction conditions and substrate structure on the stereoselectivity of allylation was carried out. Although conditions were realized to selectively afford alpha-allylation products in good to excellent yields, the search for conditions favoring beta-selectivity proved less successful.
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Affiliation(s)
- Glenn J McGarvey
- Department of Chemistry, University of Virginia, Charlottesville, Virginia 22901, USA.
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48
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Olsson JDM, Eriksson L, Lahmann M, Oscarson S. Investigations of glycosylation reactions with 2-N-acetyl-2N,3O-oxazolidinone-protected glucosamine donors. J Org Chem 2008; 73:7181-8. [PMID: 18712923 DOI: 10.1021/jo800971s] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
NIS/AgOTf-promoted glycosylations with ethyl 2,3-N,O-carbonyl-2-deoxy-1-thio-beta-D-glucopyranoside donors can be performed with either alpha- or beta-selectivity by tuning the reaction conditions. Small amounts of AgOTf (0.1 equiv) and short reaction times give beta-selectivity, whereas 0.4 equiv of AgOTf and prolonged reaction times afford alpha-linked products. NMR-monitored glycosylation and anomerization experiments show initial formation of exclusively the beta-linkage, which anomerizes, through an intramolecular mechanism involving an endocyclic C-O bond cleavage, to the alpha-linkage.
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Affiliation(s)
- Johan D M Olsson
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm, Sweden
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49
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Crich D, Wu B. Imposing the trans/gauche conformation on a sialic acid donor with a 5-N,7-O-oxazinanone group: effect on glycosylation stereoselectivity. Tetrahedron 2008; 64:2042-2047. [PMID: 19247426 PMCID: PMC2494599 DOI: 10.1016/j.tet.2007.12.026] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
A 5-N,7-O-oxazinanone derivative of a thiosialic acid ester has been synthesized and investigated for the effect of conformational restriction on glycosylation. The cyclic group is found to be powerfully disarming, but to have no beneficial effect on reaction stereoselectivity.
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Affiliation(s)
- David Crich
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, MI 48202, USA
| | - Baolin Wu
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, MI 48202, USA
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50
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Nokami T, Shibuya A, Yoshida JI. Electrochemical Conversion of Thioglycosides to Glycosyl Triflates. TRENDS GLYCOSCI GLYC 2008. [DOI: 10.4052/tigg.20.175] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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