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Hénault J, Quellier P, Mock-Joubert M, Le Narvor C, Alix A, Bonnaffé D. Regioselective Reductive Opening of Benzylidene Acetals with Dichlorophenylborane/Triethylsilane: Previously Unreported Side Reactions and How to Prevent Them. J Org Chem 2022; 87:963-973. [PMID: 35015527 DOI: 10.1021/acs.joc.1c02141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Arylidene acetals are widely used protecting groups, because of not only the high regioselectivity of their introduction but also the possibility of performing further regioselective reductive opening in the presence of a hydride donor and an acid catalyst. In this context, the Et3SiH/PhBCl2 system presents several advantages: silanes are efficient, environmentally benign, and user-friendly hydride donors, while PhBCl2 opens the way to unique regioselectivity with regard to all other Brønsted or Lewis acids used with silanes. This system has been extensively used by several groups, and we have demonstrated its high regioselectivity in the reductive opening of 4,6- and 2,4-O-p-methoxybenzylidene moieties in protected disaccharides. Surprisingly, its use on 4,6-O-benzylidene-containing substrates 1 and 2 led to unreproducible yields due to the unexpected formation of several side products. Their characterizations allowed us to identify different pitfalls potentially affecting the outcome of reductive opening of arylidenes with the Et3SiH/PhBCl2 reagent system: alkene hydroboration, azide reduction, and/or Lewis acid-promoted cleavage of the arylidene. With this knowledge, we optimized reproducible and high-yielding reaction conditions that secure and extend the scope of the Et3SiH/PhBCl2 system as a reagent for the regioselective opening of arylidenes in complex and multifunctional molecules.
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Affiliation(s)
- Jérôme Hénault
- Université Paris-Saclay, CNRS, Institut de chimie moléculaire et des matériaux d'Orsay, 91405 Orsay, France
| | - Pauline Quellier
- Université Paris-Saclay, CNRS, Institut de chimie moléculaire et des matériaux d'Orsay, 91405 Orsay, France
| | - Maxime Mock-Joubert
- Université Paris-Saclay, CNRS, Institut de chimie moléculaire et des matériaux d'Orsay, 91405 Orsay, France
| | - Christine Le Narvor
- Université Paris-Saclay, CNRS, Institut de chimie moléculaire et des matériaux d'Orsay, 91405 Orsay, France
| | - Aurélien Alix
- Université Paris-Saclay, CNRS, Institut de chimie moléculaire et des matériaux d'Orsay, 91405 Orsay, France
| | - David Bonnaffé
- Université Paris-Saclay, CNRS, Institut de chimie moléculaire et des matériaux d'Orsay, 91405 Orsay, France
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Thul M, Wu Y, Lin Y, Du S, Wu H, Ho W, Luo S. Ionic Liquid Catalyzed Per-O-Acetylation and Benzylidene Ring-Opening Reaction. Catalysts 2020; 10:642. [DOI: 10.3390/catal10060642] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Tunable aryl imidazolium ionic liquids acting as Brønsted acid ionic liquids were found to be efficient catalysts for per-O-acetylation and reductive ring opening of benzylidene acetals. This method requires a truly catalytic amount of the least expensive available ionic liquids that are water-stable and reusable and also stable at room temperature. The reactions were obtained in one hour with good to excellent yields. These reactions can form C−O and C−H bonds with a high atom economy. Furthermore, the ionic liquid is an anomeric selective catalyst in per-O-acetylation and reductive ring opening of benzylidene acetals of sugar moieties.
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Samoilov V, Ni D, Goncharova A, Zarezin D, Kniazeva M, Ladesov A, Kosyakov D, Bermeshev M, Maximov A. Bio-Based Solvents and Gasoline Components From Renewable 2,3-Butanediol and 1,2-Propanediol: Synthesis and Characterization. Molecules 2020; 25:E1723. [PMID: 32283657 DOI: 10.3390/molecules25071723] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Revised: 03/26/2020] [Accepted: 04/01/2020] [Indexed: 11/17/2022] Open
Abstract
In this study approaches for chemical conversions of the renewable compounds 1,2-propanediol (1,2-PD) and 2,3-butanediol (2,3-BD) that yield the corresponding cyclic ketals and glycol ethers have been investigated experimentally. The characterization of the obtained products as potential green solvents and gasoline components is discussed. Cyclic ketals have been obtained by the direct reaction of the diols with lower aliphatic ketones (1,2-PD + acetone → 2,2,4-trimethyl-1,3-dioxolane (TMD) and 2,3-BD + butanone-2 → 2-ethyl-2,4,5-trimethyl-1,3-dioxolane (ETMD)), for which the ΔH0r, ΔS0r and ΔG0r values have been estimated experimentally. The monoethers of diols could be obtained through either hydrogenolysis of the pure ketals or from the ketone and the diol via reductive alkylation. In the both reactions, the cyclic ketals (TMD and ETMD) have been hydrogenated in nearly quantitative yields to the corresponding isopropoxypropanols (IPP) and 3-sec-butoxy-2-butanol (SBB) under mild conditions (T = 120-140 °C, p(H2) = 40 bar) with high selectivity (>93%). Four products (TMD, ETMD, IPP and SBB) have been characterized as far as their physical properties are concerned (density, melting/boiling points, viscosity, calorific value, evaporation rate, Antoine equation coefficients), as well as their solvent ones (Kamlet-Taft solvatochromic parameters, miscibility, and polymer solubilization). In the investigation of gasoline blending properties, TMD, ETMD, IPP and SBB have shown remarkable antiknock performance with blending antiknock indices of 95.2, 92.7, 99.2 and 99.7 points, respectively.
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Xu Y, Mu J, Xu Z, Zhong H, Chen Z, Ni Q, Liang XJ, Guo S. Modular Acid-Activatable Acetone-Based Ketal-Linked Nanomedicine by Dexamethasone Prodrugs for Enhanced Anti-Rheumatoid Arthritis with Low Side Effects. Nano Lett 2020; 20:2558-2568. [PMID: 32167768 DOI: 10.1021/acs.nanolett.9b05340] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Given the physically encapsulated payloads with drug burst release and/or low drug loading, it is critical to initiate an innovative prodrug strategy to optimize the design of modular nanomedicines. Here, we designed modular pH-sensitive acetone-based ketal-linked prodrugs of dexamethasone (AKP-dexs) and formulated them as nanoparticles. We comprehensively studied the relationships between AKP-dex structure and properties, and we selected two types of AKP-dex-loaded nanoparticles for in vivo studies on the basis of their size, drug loading, and colloidal stability. In a collagen-induced arthritis rat model, these AKP-dex-loaded nanoparticles showed higher accumulation in inflamed joints and better therapeutic efficacy than free dexamethasone phosphate with less-severe side effects. AKP-dex-loaded nanoparticles may be useful for treating other inflammatory diseases and thus have great translational potential. Our findings represent an important step toward the development of practical applications for acetone-based ketal-linked prodrugs and are useful in the design of modular nanomedicines.
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Affiliation(s)
- Yang Xu
- Key Laboratory of Functional Polymer Materials of Ministry of Education, State Key Laboratory of Medicinal Chemical Biology and Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, P. R. China
| | - Jingqing Mu
- Key Laboratory of Functional Polymer Materials of Ministry of Education, State Key Laboratory of Medicinal Chemical Biology and Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, P. R. China
| | - Zunkai Xu
- Key Laboratory of Functional Polymer Materials of Ministry of Education, State Key Laboratory of Medicinal Chemical Biology and Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, P. R. China
| | - Haiping Zhong
- Key Laboratory of Functional Polymer Materials of Ministry of Education, State Key Laboratory of Medicinal Chemical Biology and Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, P. R. China
| | - Ziqi Chen
- Key Laboratory of Functional Polymer Materials of Ministry of Education, State Key Laboratory of Medicinal Chemical Biology and Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, P. R. China
| | - Qiankun Ni
- Laboratory of Controllable Nanopharmaceuticals, CAS Center for Excellence in Nanoscience, CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology, No. 11 First North Road, Zhongguancun, Beijing 100190, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Xing-Jie Liang
- Laboratory of Controllable Nanopharmaceuticals, CAS Center for Excellence in Nanoscience, CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology, No. 11 First North Road, Zhongguancun, Beijing 100190, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Shutao Guo
- Key Laboratory of Functional Polymer Materials of Ministry of Education, State Key Laboratory of Medicinal Chemical Biology and Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, P. R. China
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Wang T, Demchenko AV. Synthesis of carbohydrate building blocks via regioselective uniform protection/deprotection strategies. Org Biomol Chem 2019; 17:4934-4950. [PMID: 31044205 DOI: 10.1039/c9ob00573k] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Discussed herein is the synthesis of partially protected carbohydrates by manipulating only one type of a protecting group for a given substrate. The first focus of this review is the uniform protection of an unprotected starting material in a way that only one (or two) hydroxyl group remains unprotected. The second focus involves regioselective partial deprotection of uniformly protected compounds in a way that only one (or two) hydroxyl group becomes liberated.
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Affiliation(s)
- Tinghua Wang
- Department of Chemistry and Biochemistry, University of Missouri - St Louis, One University Boulevard, St Louis, Missouri 63121, USA.
| | - Alexei V Demchenko
- Department of Chemistry and Biochemistry, University of Missouri - St Louis, One University Boulevard, St Louis, Missouri 63121, USA.
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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] [What about the content of this article? (0)] [Affiliation(s)] [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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Samoilov VO, Onishchenko MO, Ramazanov DN, Maximov AL. Glycerol Isopropyl Ethers: Direct Synthesis from Alcohols and Synthesis by the Reduction of Solketal. ChemCatChem 2017. [DOI: 10.1002/cctc.201700108] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Vadim O. Samoilov
- Petroleum Chemistry and Organic Catalysis Laboratory; Faculty of Chemistry of Moscow State University; Leninskiye Gory 1 Moscow Russia
| | - Maria O. Onishchenko
- Petroleum Chemistry and Organic Catalysis Laboratory; Faculty of Chemistry of Moscow State University; Leninskiye Gory 1 Moscow Russia
| | - Dzhamalutdin N. Ramazanov
- Petroleum Chemistry and Organic Catalysis Laboratory; Faculty of Chemistry of Moscow State University; Leninskiye Gory 1 Moscow Russia
| | - Anton L. Maximov
- Petroleum Chemistry and Organic Catalysis Laboratory; Faculty of Chemistry of Moscow State University; Leninskiye Gory 1 Moscow Russia
- Hydrocarbons Chemistry Laboratory; A. V. Topchiev Institute of Petrochemical Synthesis RAS; Leninsky prospect 29 Moscow Russia
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Gozlan C, Lafon R, Duguet N, Redl A, Lemaire M. Catalytic reductive cleavage of methyl α-d-glucoside acetals to ethers using hydrogen as a clean reductant. RSC Adv 2014. [DOI: 10.1039/c4ra09350j] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Manabe S, Ito Y. Hafnium(IV) tetratriflate in selective reductive carbohydrate benzylidene acetal opening reaction and direct silylation reaction. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.10.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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10
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Zhang YJ, Dayoub W, Chen GR, Lemaire M. TMDS as a Dual-Purpose Reductant in the Regioselective Ring Cleavage of Hexopyranosyl Acetals to Ethers. European J Org Chem 2012. [DOI: 10.1002/ejoc.201101682] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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11
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Ohlin M, Johnsson R, Ellervik U. Regioselective reductive openings of 4,6-benzylidene acetals: synthetic and mechanistic aspects. Carbohydr Res 2011; 346:1358-70. [DOI: 10.1016/j.carres.2011.03.032] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2011] [Accepted: 03/22/2011] [Indexed: 11/24/2022]
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12
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Daragics K, Szabó P, Fügedi P. Some observations on the reductive ring opening of 4,6-O-benzylidene acetals of hexopyranosides with the borane trimethylamine–aluminium chloride reagent. Carbohydr Res 2011; 346:1633-7. [DOI: 10.1016/j.carres.2011.04.046] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2011] [Revised: 04/22/2011] [Accepted: 04/27/2011] [Indexed: 11/28/2022]
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13
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Rujirawanich J, Kongkathip B, Kongkathip N. Regioselective ring opening of exo- and endo-3,4-benzylidene acetals of arabinopyranoside derivatives with Lewis acids and reducing agents. Carbohydr Res 2011; 346:927-32. [DOI: 10.1016/j.carres.2011.01.031] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2010] [Revised: 01/24/2011] [Accepted: 01/27/2011] [Indexed: 11/21/2022]
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Ek M, Garegg PJ, Hultberg H, Oscarson S. Reductive Ring Openings of Carbohydrate Benzylidene Acetals Using Borane-Trimethylamine and Aluminium Chloride. Regioselectivity and Solvent Dependance. J Carbohydr Chem 2010. [DOI: 10.1080/07328308308057876] [Citation(s) in RCA: 143] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Rao KV, Patil PR, Atmakuri S, Kartha KR. Iodine–sodium cyanoborohydride-mediated reductive ring opening of 4,6-O-benzylidene acetals of hexopyranosides. Carbohydr Res 2010; 345:2709-13. [DOI: 10.1016/j.carres.2010.10.013] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2010] [Revised: 10/04/2010] [Accepted: 10/10/2010] [Indexed: 11/16/2022]
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Contreras RR, Kamerling JP, Vliegenthart JFG. 1H- and 13C-NMR spectroscopy of synthetic monosulfated methyl α-D-mannopyranosides. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/recl.19911100305] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Kloosterman M, Slaghek T, Hermans JPG, van Boom JH. Oxidative and reductive ring opening of endo-3,4-O-(4-methoxybenzylidene) acetals of 1, 6-anhydro-β-D-galactopyranoses. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/recl.19841031201] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Daragics K, Fügedi P. Regio- and chemoselective reductive cleavage of 4,6-O-benzylidene-type acetals of hexopyranosides using BH3·THF–TMSOTf. Tetrahedron Lett 2009; 50:2914-6. [DOI: 10.1016/j.tetlet.2009.03.194] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Tanaka N, Ogawa I, Yoshigase S, Nokami J. Regioselective ring opening of benzylidene acetal protecting group(s) of hexopyranoside derivatives by DIBAL-H. Carbohydr Res 2008; 343:2675-9. [DOI: 10.1016/j.carres.2008.07.017] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2008] [Revised: 07/25/2008] [Accepted: 07/28/2008] [Indexed: 11/24/2022]
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Johnsson R, Olsson D, Ellervik U. Reductive Openings of Acetals: Explanation of Regioselectivity in Borane Reductions by Mechanistic Studies. J Org Chem 2008; 73:5226-32. [DOI: 10.1021/jo800396g] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Richard Johnsson
- Organic Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
| | - Dan Olsson
- Organic Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
| | - Ulf Ellervik
- Organic Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
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Wang Y, Cheon HS, Kishi Y. Unique Reactivity of the Mukaiyama Glycosidation Catalyst (SnCl3ClO4) Toward β-Mannopyranosides. Chem Asian J 2008; 3:319-26. [DOI: 10.1002/asia.200700297] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Wessel HP, Plessis I, Cassel S, Arnold W. Unexpected Products in the Lialh4/Alcl3-Reduction of 3-O-Substituted and N-Benzyloxycarbonyl-Protected 4,6-O-[2-Methoxybenzylidene]-α-D-Glucosamine Derivatives. J Carbohydr Chem 2006. [DOI: 10.1080/07328309708006541] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Hans Peter Wessel
- a Pharma Division , Preclinical Research F. Hoffmann-La Roche Ltd , CH-4070, Basel, Switzerland
| | - Isabelle Plessis
- a Pharma Division , Preclinical Research F. Hoffmann-La Roche Ltd , CH-4070, Basel, Switzerland
| | - Stéphanie Cassel
- a Pharma Division , Preclinical Research F. Hoffmann-La Roche Ltd , CH-4070, Basel, Switzerland
| | - Wolf Arnold
- a Pharma Division , Preclinical Research F. Hoffmann-La Roche Ltd , CH-4070, Basel, Switzerland
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Affiliation(s)
- John A. Soderquist
- University of Puerto Rico, Department of Chemistry, Rio Piedras, Puerto Rico 00931-3346
| | - Iveliz Kock
- University of Puerto Rico, Department of Chemistry, Rio Piedras, Puerto Rico 00931-3346
| | - Maria E. Estrella
- University of Puerto Rico, Department of Chemistry, Rio Piedras, Puerto Rico 00931-3346
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Pabba J, Rempel B, Withers S, Vasella A. Synthesis of Glycaro-1,5-lactams and Tetrahydrotetrazolopyridine-5-carboxylates: Inhibitors ofβ-D-Glucuronidase andα-L-Iduronidase. Helv Chim Acta 2006. [DOI: 10.1002/hlca.200690066] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Borbás A, Szabó ZB, Szilágyi L, Bényei A, Lipták A. Stereoselective (2-naphthyl)methylation of sugar hydroxyls by the hydrogenolysis of diastereoisomeric dioxolane-type (2-naphthyl)methylene acetals. Carbohydr Res 2002; 337:1941-51. [PMID: 12433460 DOI: 10.1016/s0008-6215(02)00180-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The cis axial/equatorial OH groups of methyl alpha-L- and ethyl 1-thio-alpha-L-rhamnopyranoside, 1,6-anhydro-beta-D-mannopyranose, and 1,6-anhydro-beta-D-galactopyranose were reacted with 2-naphthaldehyde dimethyl acetal to diastereomeric dioxolane-type 2,3-O-(2-naphthyl)methylene or 3,4-O-(2-naphthyl)methylene acetals. The glycosides yielded the exo- and endo-isomers in nearly 1:1 ratio, 1,6-anhydro-beta-D-mannopyranose gave predominantly the endo-, and 1,6-anhydro-beta-D-galactopyranose exclusively endo-isomer. The acetals and some of their fully protected derivatives bearing benzyl or tert-butyldimethylsilyl groups were hydrogenolised with AlH(3) (3LiAlH(4)-AlCl(3)) or with Me(3)N.BH(3)-AlCl(3) reagents. The endo-isomers were cleaved by both reagents to give axial NAP ethers, the exo-isomers of pyranosides furnished equatorial NAP ethers. However, the exo-isomers of pyranoses gave irregular axial ethers with a > 30-fold enhancement of the reaction rates with respect to the endo-isomer.
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Affiliation(s)
- Anikó Borbás
- Research Group for Carbohydrates of the Hungarian Academy of Sciences, Debrecen, PO Box 55, H-4010, Hungary
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Desmet T, Nerinckx W, Stals I, Callewaert N, Contreras R, Claeyssens M. Novel tools for the study of class I alpha-mannosidases: a chromogenic substrate and a substrate-analog inhibitor. Anal Biochem 2002; 307:361-7. [PMID: 12202255 DOI: 10.1016/s0003-2697(02)00039-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The use of chromogenic substrates for evaluation of class I alpha-mannosidase is described. 2('),4(')-Dinitrophenyl-alpha-D-mannopyranoside allows rapid and sensitive assays of enzymatic activities, e.g., of heterologously expressed alpha-1,2-mannosidase from Trichoderma reesei. Interaction constants of several ligands with alpha-mannosidases from class I and II could also be determined. Furthermore, novel types of inhibitors derived from D-lyxose are presented. Methyl-alpha-D-lyxopyranosyl-(1(')-->2)-alpha-D-mannopyranoside is a potent inhibitor of the alpha-1,2-mannosidase from T. reesei (K(i)=600 microM) and since it probably spans subsites -1/+1, this disaccharide could be valuable in crystallographic studies of class I alpha-mannosidases.
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Affiliation(s)
- T Desmet
- Laboratory for Biochemistry, Department of Biochemistry, Physiology, and Microbiology, Ghent University, K.L. Ledeganckstraat 35, B-9000 Ghent, Belgium
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Borbás A, Szabó ZB, Szilágyi L, Bényei A, Lipták A. Dioxane-type (2-naphthyl)methylene acetals of glycosides and their hydrogenolytic transformation into 6-O- and 4-O-(2-naphthyl)methyl (NAP) ethers. Tetrahedron 2002; 58:5723-32. [DOI: 10.1016/s0040-4020(02)00515-x] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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32
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Abstract
The chemical synthesis of alpha-L-Fucp-(1 --> 3)-beta-D-GalpNAc-(1 --> 4)-beta-D-GlcpNAc-(1 --> 3)-alpha-D-GalpO(CH2)5NH2, beta-D-GalpNAc-(1 --> 4)-[alpha-L-Fucp-(1 --> 3)-]beta-D-GlcpNAc-(1 --> 3)-alpha-D-GalpO(CH2)5NH2, and alpha-L-Fucp-(1 --> 3)-beta-D-GalpNAc-(1 --> 4)-[alpha-L-Fucp-(1 --> 3)-]beta-D-GlcpNAc-(1 --> 3)-alpha-D-GalpO(CH2)5NH2 is described. These structures represent fucosylated oligosaccharide fragments of the glycocalyx glycan of the cercarial stage of the parasite Schistosoma mansoni, and in protein-conjugated form they are potential diagnostics in the search for antibodies raised against the glycan in the serum of infected humans.
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Affiliation(s)
- Károly Agoston
- Institute of Biochemistry, Faculty of Sciences, University of Debrecen, Hungary
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33
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Abstract
The reaction of DIBALH with bis(heteroannulated)-pyranosides containing the perhydrofuro[2,3-b]pyran moiety is described. The hydride attack at the anomeric carbon (C-9a) resulted in the exclusive tetrahydrofuran ring opening. The selectivity of this reaction has been evaluated as other benzylidene acetals built on these substrates remain practically or partially unaltered in these conditions depending on the steric volume of the O-protecting group located at C-4 (TBDMS vs. Me). This protocol can be considered as a new entry for the synthesis of chiral and highly functionalized cyclopentanes.
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Affiliation(s)
- J Marco-Contelles
- Laboratorio de Radicales Libres, Instituto de Quimica Organica General, CSIC, C/Juan de la Cierva 3, ES-28006 Madrid, Spain.
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34
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Hirooka M, Mori Y, Sasaki A, Koto S, Shinoda Y, Morinaga A. Synthesis ofβ-D-Ribofuranosyl-(1→3)-α-L-rhamnopyranosyl-(1→3)-L-rhamnopyranose by in situ Activating Glycosylation Using 1-OH Sugar Derivative and Me3SiBr–CoBr2–Bu4NBr–Molecular Sieves 4A System. BCSJ 2001. [DOI: 10.1246/bcsj.74.1679] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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35
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37
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Ohtake H, Ichiba N, Ikegami S. A highly stereoselective construction of beta-glycosyl linkages by reductive cleavage of cyclic sugar ortho esters. J Org Chem 2000; 65:8171-9. [PMID: 11101370 DOI: 10.1021/jo0005870] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The preparation of beta-glycosides by the reductive cleavage of spiro sugar ortho esters is described in this report. This procedure is based on a concept completely different from those of other methods for glycosylation. Twelve sugar ortho esters that commonly possess perhydrospiro[2H-pyran-2,2'-pyrano[3,2-d][1,3]dioxin] ring systems in their molecules were reduced by LiAlH(4)/AlCl(3) or NaCNBH(3)/AlCl(3). Among these ortho esters, those (9a-12a) prepared from the D-sugar lactones (1-4) and 2, 3-di-O-benzyl-alpha-D-glucopyranoside (7) or those (19a, 20a) prepared from the L-sugar lactones (5, 6) and 2, 3-di-O-benzyl-alpha-D-galactopyranoside (8) were selectively converted into beta-(1 --> 4)-glycosides (9b-12b or 19b, 20b) in excellent yields by the treatment of LiAlH(4)/AlCl(3). In contrast, the ortho esters (13a-16a or 17a, 18a) that were prepared from combinations of the D-sugar lactones and 8 or those of the L-sugar lactones and 7 were efficiently reduced with NaBH(3)CN/AlCl(3) to afford beta-(1 --> 6)-glycosides (13b-16b or 17b, 18b) selectively. It was remarkable that the resulting disaccharides were obtained with extremely high beta-selectivity even in the cases with mannosyl or rhamnosyl glycosides. Moreover, these products would be useful units for the construction of branched saccharides, because the newly formed hydroxy groups could be again glycosylated without further deprotection procedures. The high regio- and stereoselectivity was totally explained by considering the structures and the conformations of these ortho ester molecules and the stereoelectoronic effects of their spiro ring systems. In addition, the preparation of the sugar ortho esters with glucosamine derivatives and the reactivity of these ortho esters are described in this report. N-Phthaloyl glucosamine derivatives (21, 22) were efficiently reacted with the benzyl-protected gluconolactone (1) in the presence of TMSOMe and TMSOTf to afford ortho esters (23a-c). After the conversion of the phthalimido functionality to the dibenzyl amino group, glucosylideneglucosamine (25) was reduced with LiAlH(4)/AlCl(3) to afford beta-(1 --> 4)-glycoside (26) selectively.
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Affiliation(s)
- H Ohtake
- School of Pharmaceutical Sciences, Teikyo University, Sagamiko, Kanagawa 199-0195, Japan
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38
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Lipták A, Borbás A, Jánossy L, Szilágyi L. Preparation of (2-naphthyl)methylene acetals of glycosides and their hydrogenolytic transformation into 2-naphthylmethyl (NAP) ethers. Tetrahedron Lett 2000; 41:4949-53. [DOI: 10.1016/s0040-4039(00)00735-8] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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39
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Koto S, Kusunoki A, Hirooka M. In situ Activating Glycosylation of 6-Deoxysugars: Synthesis ofO-α-D-Fucosyl-(1→4)-O-α-D-fucosyl-(1→4)-O-α-D-quinovosyl-(1→4)-D-quinovose. BCSJ 2000. [DOI: 10.1246/bcsj.73.967] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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40
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41
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Hirooka M, Koto S. Dehydrative Glycosylation by Diethylaminosulfur Trifluoride (DAST)–Tin(II) Trifluoromethanesulfonate–Tetrabutylammonium Perchlorate–Triethylamine System. BCSJ 1998. [DOI: 10.1246/bcsj.71.2893] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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42
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43
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Iimori T, Ohtake H, Ikegami S. A highly stereoselective β-(1→4)-glycosidic bond formation by reductive cleavage of cyclic orthoesters. Tetrahedron Lett 1997; 38:3415-8. [DOI: 10.1016/s0040-4039(97)00634-5] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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45
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Kosmol R, Hennig L, Welzel P, Findesien M, Müller D, Markus A, van Heijenoort J. A Moenomycin-type Structural Analogue of Lipid II some possible mechanisms of the mode of action of transglycosylase inhibitors can be discarded. ACTA ACUST UNITED AC 1997. [DOI: 10.1002/prac.19973390162] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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46
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Abstract
The title compound methyl O-(2,6-di-O-benzyl-3-O-methyl-alpha-D-mannopyranosyl)-[(1-->4) -O-(2,6-di-O-benzyl-3-O-methyl-alpha-D-mannopyranosyl)]4-(1-->4) -2,6-di-O-benzyl-3-O-methyl-alpha-D-mannopyranoside (2) was synthesized in a blockwise manner, employing trichloroacetimidate (11) and (20) as glycosyl donors. The strategy relies on the single-step preparation of the 3-O-methyl ethers (4) and (12) as starting materials. Since all intermediates contain one or more OCH3 groups, they are easily identified by NMR spectroscopy using the methyl proton signals. Compound 2 corresponds to the reducing terminal hexasaccharide of mycobacterial 3-O-methyl-mannose polysaccharide (MNP). MMP has the unusual property of stimulating the fatty acid synthetase multienzyme complex. Compound 2 can serve as a suitable glycosyl acceptor for the synthesis of extended fragments of MMP.
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Affiliation(s)
- W Liao
- Research Center for Eco-Environmental Sciences, Academia Sinica, Beijing, PR China
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Heuer M, Hohgardt K, Heinemann F, Kühne H, Dietrich W, Grzelak D, Müller D, Welzel P, Markus A, Heijenoort YV, Heijenoort JV. Structural analogues of the antibiotic moenomycin a with a D-glucose-derived unit F. Tetrahedron 1994. [DOI: 10.1016/s0040-4020(01)85066-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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49
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50
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Hajkó J, Borbás A, Lipták A, Kajtár-Peredy M. Preparation of dioxolane-type fluoren-9-ylidene acetals of carbohydrates and their hydrogenolysis with AlClH 2 to give axial fluoren-9-yl ethers. Carbohydr Res 1992. [DOI: 10.1016/0008-6215(92)84177-t] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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