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Gormand P, Pichette A, Legault J, Alsarraf J. Synthesis and Cytotoxicity of Monomethylated Betulinic Acid 3- O-α-l-Rhamnopyranosides. ACS OMEGA 2023; 8:36118-36125. [PMID: 37810724 PMCID: PMC10552092 DOI: 10.1021/acsomega.3c04301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Accepted: 08/11/2023] [Indexed: 10/10/2023]
Abstract
Three original derivatives of the cytotoxic betulinic acid 3-O-α-l-rhamnopyranoside featuring a monomethylated rhamnoside residue were synthesized. An improved catalytic procedure was involved to functionalize the O-3 position of the monosaccharide in a site-selective fashion. The cytotoxicity of the novel compounds was evaluated in vitro to highlight the moderate impact of carbohydrate monomethylation on the biological activity of betulinic acid 3-O-α-l-rhamnopyranoside.
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Affiliation(s)
- Paul Gormand
- Centre de recherche sur la
boréalie (CREB), Laboratoire d’analyse et de séparation
des essences végétales (LASEVE), Université du Québec à Chicoutimi, 555 boulevard de l’Université, Chicoutimi G7H 2B1, QC, Canada
| | - André Pichette
- Centre de recherche sur la
boréalie (CREB), Laboratoire d’analyse et de séparation
des essences végétales (LASEVE), Université du Québec à Chicoutimi, 555 boulevard de l’Université, Chicoutimi G7H 2B1, QC, Canada
| | - Jean Legault
- Centre de recherche sur la
boréalie (CREB), Laboratoire d’analyse et de séparation
des essences végétales (LASEVE), Université du Québec à Chicoutimi, 555 boulevard de l’Université, Chicoutimi G7H 2B1, QC, Canada
| | - Jérôme Alsarraf
- Centre de recherche sur la
boréalie (CREB), Laboratoire d’analyse et de séparation
des essences végétales (LASEVE), Université du Québec à Chicoutimi, 555 boulevard de l’Université, Chicoutimi G7H 2B1, QC, Canada
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Kim S, Oiler J, Xing Y, O'Doherty GA. De novo asymmetric Achmatowicz approach to oligosaccharide natural products. Chem Commun (Camb) 2022; 58:12913-12926. [PMID: 36321854 PMCID: PMC9710213 DOI: 10.1039/d2cc05280f] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/30/2023]
Abstract
The development and application of the asymmetric synthesis of oligosaccharides from achiral starting materials is reviewed. This de novo asymmetric approach centers around the use of asymmetric catalysis for the synthesis of optically pure furan alcohols in conjunction with Achmatowicz oxidative rearrangement for the synthesis of various pyranones. In addition, the use of a diastereoselective palladium-catalyzed glycosylation and subsequent diastereoselective post-glycosylation transformation was used for the synthesis of oligosaccharides. The application of this approach to oligosaccharide synthesis is discussed.
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Affiliation(s)
- Sugyeom Kim
- Department of Chemistry and Chemical Biology, Northeastern University, Boston, MA, 02115, USA.
| | - Jeremy Oiler
- Department of Chemistry, William Paterson University, Wayne, NJ, 07470, USA
| | - Yalan Xing
- Department of Chemistry, Hofstra University, Hempstead, NY, 11549, USA.
| | - George A O'Doherty
- Department of Chemistry and Chemical Biology, Northeastern University, Boston, MA, 02115, USA.
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3
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Petitpoisson L, Pichette A, Alsarraf J. Towards better syntheses of partially methylated carbohydrates? Org Chem Front 2022. [DOI: 10.1039/d2qo00893a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We give an overview of the reported synthetic strategies towards partially methylated glycosides and discuss how better protocols could stem from catalytic site-selective transformations of carbohydrates and cleaner methylation reagents.
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Affiliation(s)
- Lucas Petitpoisson
- Centre de recherche sur la boréalie (CREB), Laboratoire d'analyse et de séparation des essences végétales (LASEVE), Université du Québec à Chicoutimi, 555 boulevard de l'Université, Chicoutimi G7H 2B1, Québec, Canada
| | - André Pichette
- Centre de recherche sur la boréalie (CREB), Laboratoire d'analyse et de séparation des essences végétales (LASEVE), Université du Québec à Chicoutimi, 555 boulevard de l'Université, Chicoutimi G7H 2B1, Québec, Canada
| | - Jérôme Alsarraf
- Centre de recherche sur la boréalie (CREB), Laboratoire d'analyse et de séparation des essences végétales (LASEVE), Université du Québec à Chicoutimi, 555 boulevard de l'Université, Chicoutimi G7H 2B1, Québec, Canada
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4
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Catalytic, Regioselective Sulfonylation of Carbohydrates with Dibutyltin Oxide under Solvent-Free Conditions. Catalysts 2021. [DOI: 10.3390/catal11020202] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
A simple approach was developed for the solvent-free regioselective functionalization of carbohydrate polyols with 4-toluesulfonyl (tosyl) group, allowing the easy and quick activation of a saccharide site with a tosylate leaving group. The method is based on the use of catalytic dibutyltin oxide and tetrabuylammonium bromide (TBAB), and a moderate excess of N,N-diisopropylethyl amine (DIPEA) and tosyl chloride (TsCl), leading to the selective functionalization at 75 °C of a secondary equatorial hydroxy function flanked by an axial one in a pyranoside. The procedure is endowed with several advantages, such as the use of cheap reagents, experimental simplicity, and the need for reduced reaction times in comparison with other known approaches.
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Facile synthesis of per(6-O-tert-butyldimethylsilyl)-α-, β-, and γ-cyclodextrin as protected intermediates for the functionalization of the secondary face of the macrocycles. Nat Protoc 2021; 16:965-987. [PMID: 33452503 DOI: 10.1038/s41596-020-00443-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2020] [Accepted: 09/28/2020] [Indexed: 01/29/2023]
Abstract
Per(6-O-tert-butyldimethylsilyl)-α-, β- and γ-cyclodextrin derivatives are well-known as synthetic intermediates that enable the selective mono-, partial, or perfunctionalization of the secondary face of the macrocycles. Although silylation of the primary rim is readily achieved by treatment with tert-butyldimethylsilyl chloride in the presence of pyridine (either alone or mixed with a co-solvent), the reaction typically results in a mixture containing both under- and oversilylated byproducts that are difficult to remove. To address this challenge in preparing a pure product in high yield, we describe an approach that centers on the addition of a controlled excess of silylating agent to avoid the presence of undersilylated species, followed by the removal of oversilylated species by column chromatography elution with carefully designed solvent mixtures. This methodology works well for 6-, 7-, and 8-member rings (α-, β-, and γ-cyclodextrins, respectively) and has enabled us to repeatedly prepare up to ⁓35 g of ≥98% pure product (as determined by HPLC) in 3 d. We also provide procedures for lower-scale reactions, as well as an example of how the β-cyclodextrin derivative can be used for functionalization of the secondary face of the molecule.
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Lv J, Zhu JJ, Liu Y, Dong H. Regioselective Sulfonylation/Acylation of Carbohydrates Catalyzed by FeCl 3 Combined with Benzoyltrifluoroacetone and Its Mechanism Study. J Org Chem 2020; 85:3307-3319. [PMID: 31984732 DOI: 10.1021/acs.joc.9b03128] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A catalytic amount of FeCl3 combined with benzoyl trifluoroacetone (Hbtfa) (FeCl3/Hbtfa = 1/2) was used to catalyze sulfonylation/acylation of diols and polyols using diisopropylethylamine (DIPEA) or potassium carbonate (K2CO3) as a base. The catalytic system exhibited high catalytic activity, leading to excellent isolated yields of sulfonylation/acylation products with high regioselectivities. Mechanism studies indicated that FeCl3 initially formed [Fe(btfa)3] (btfa = benzoyl trifluoroacetonate) with twice the amount of Hbtfa under basic conditions in the solvent acetonitrile at room temperature. Then, Fe(btfa)3 and two hydroxyl groups of the substrates formed a five- or six-membered ring intermediate in the presence of the base. The subsequent reaction between the cyclic intermediate and a sulfonylation reagent led to the selective sulfonylation of the substrate. All key intermediates were captured in the high-resolution mass spectrometry assay, therefore demonstrating this mechanism for the first time.
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Affiliation(s)
- Jian Lv
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, School of Chemistry & Chemical Engineering, Huazhong University of Science & Technology, Luoyu Road 1037, Wuhan 430074, PR China
| | - Jia-Jia Zhu
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, School of Chemistry & Chemical Engineering, Huazhong University of Science & Technology, Luoyu Road 1037, Wuhan 430074, PR China
| | - Yu Liu
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, School of Chemistry & Chemical Engineering, Huazhong University of Science & Technology, Luoyu Road 1037, Wuhan 430074, PR China
| | - Hai Dong
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, School of Chemistry & Chemical Engineering, Huazhong University of Science & Technology, Luoyu Road 1037, Wuhan 430074, PR China.,Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica, Huazhong University of Science & Technology, Luoyu Road 1037, Wuhan 430074, PR China
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Dimakos V, Taylor MS. Site-Selective Functionalization of Hydroxyl Groups in Carbohydrate Derivatives. Chem Rev 2018; 118:11457-11517. [DOI: 10.1021/acs.chemrev.8b00442] [Citation(s) in RCA: 148] [Impact Index Per Article: 24.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Victoria Dimakos
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON M5S 3H6, Canada
| | - Mark S. Taylor
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON M5S 3H6, Canada
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9
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Lu S, Boyd RJ, Grindley TB. Role of Fluoride in Accelerating the Reactions of Dialkylstannylene Acetals. J Org Chem 2015; 80:2989-3002. [DOI: 10.1021/jo502560q] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Simiao Lu
- Department of Chemistry, Dalhousie University, 6274 Coburg Road, P.O. Box 15000, Halifax, Nova Scotia, Canada B3H 4R2
| | - Russell J. Boyd
- Department of Chemistry, Dalhousie University, 6274 Coburg Road, P.O. Box 15000, Halifax, Nova Scotia, Canada B3H 4R2
| | - T. Bruce Grindley
- Department of Chemistry, Dalhousie University, 6274 Coburg Road, P.O. Box 15000, Halifax, Nova Scotia, Canada B3H 4R2
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Sanapala SR, Kulkarni SS. Chemical synthesis of asparagine-linked archaeal N-glycan from Methanothermus fervidus. Chemistry 2014; 20:3578-83. [PMID: 24616211 DOI: 10.1002/chem.201304950] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Revised: 02/02/2014] [Indexed: 12/12/2022]
Abstract
Several N-linked glycoproteins have been identified in archaea and there is growing evidence that the N-glycan is involved in survival and functioning of archaea in extreme conditions. Chemical synthesis of the archaeal N-glycans represents a crucial step towards understanding the putative function of protein glycosylation in archaea. Herein the first total synthesis of the archaeal L-asparagine linked hexasaccharide from Methanothermus fervidus is reported using a highly convergent [3+3] glycosylation approach in high overall yields. The synthesis relies on efficient preparation of regioselectively protected thioglycoside building blocks for orthogonal glycosylations and late stage N-aspartylation.
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Affiliation(s)
- Someswara Rao Sanapala
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, 400076 (India)
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Huang X, Vocadlo DJ. Reports from the award symposia hosted by the American Chemical Society, Division of Carbohydrate Chemistry at the 245th American Chemical Society National Meeting. ACS Chem Biol 2013; 8:1361-5. [PMID: 24491206 DOI: 10.1021/cb400398f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We would like to congratulate all of the award winners for the well deserved honor. The award symposia provided a snapshot of some of the state-of-the-art research at the interface between chemistry and biology in the glycoscience field. The presentations serve as prime examples of the increasing integration of chemical and biological research in the area of glycoscience and how tools of chemistry can be applied to answer interesting, important, and fundamental biological questions. We look forward to many more years of exciting developments in the chemistry and chemical biology of glycoscience and anticipate improved tools and approaches will drive major advances while also spurring interests in the wider field.
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Affiliation(s)
- Xuefei Huang
- Department of Chemistry, Michigan State University, 578 S. Shaw Lane, East Lansing, Michigan 48864, United States
| | - David J. Vocadlo
- Departments of Chemistry, Molecular Biology, and Biochemistry, Simon Fraser University, 8888 University Dr., Burnaby, BC, V5A 1S6, Canada
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12
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Xia L, Lowary TL. Amphiphilic cytosolic glycans from mycobacteria: occurrence, lipid-binding properties, biosynthesis, and synthesis. Biopolymers 2013; 99:697-712. [PMID: 23703393 DOI: 10.1002/bip.22290] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2013] [Revised: 05/13/2013] [Accepted: 05/14/2013] [Indexed: 11/10/2022]
Abstract
Polymethylated polysaccharides (PMPSs), glycans composed of 10-20 carbohydrate residues the majority of which carry a single methyl group, are produced by some mycobacterial species. O-Methylation thus occurs on 20-30% of all the hydroxyl groups within the molecule, rendering them amphiphilic. A property of PMPSs is their ability to form high-affinity complexes with fatty acids and their derivatives, suggesting a role in mycobacterial fatty acid biosynthesis. However, direct evidence for their in vivo function is still lacking. Over the past several decades the lipid-binding properties, biosynthesis, and chemical synthesis of PMPSs have been explored and this review will provide an overview of progress made in these areas.
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Affiliation(s)
- Li Xia
- Alberta Glycomics Centre and Department of Chemistry, University of Alberta, Gunning-Lemieux Chemistry Centre, Edmonton, AB T6G 2G2, Canada
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