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Kunanopparat A, Dinh TTH, Ponpakdee P, Padungros P, Kaewduangduen W, Ariya-anandech K, Tummamunkong P, Samaeng A, Sae-ear P, Leelahavanichkul A, Hirankarn N, Ritprajak P. Complement receptor 3-dependent engagement by Candida glabrata β-glucan modulates dendritic cells to induce regulatory T-cell expansion. Open Biol 2024; 14:230315. [PMID: 38806144 PMCID: PMC11293457 DOI: 10.1098/rsob.230315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 03/05/2024] [Accepted: 04/15/2024] [Indexed: 05/30/2024] Open
Abstract
Candida glabrata is an important pathogen causing invasive infection associated with a high mortality rate. One mechanism that causes the failure of Candida eradication is an increase in regulatory T cells (Treg), which play a major role in immune suppression and promoting Candida pathogenicity. To date, how C. glabrata induces a Treg response remains unclear. Dendritic cells (DCs) recognition of fungi provides the fundamental signal determining the fate of the T-cell response. This study investigated the interplay between C. glabrata and DCs and its effect on Treg induction. We found that C. glabrata β-glucan was a major component that interacted with DCs and consequently mediated the Treg response. Blocking the binding of C. glabrata β-glucan to dectin-1 and complement receptor 3 (CR3) showed that CR3 activation in DCs was crucial for the induction of Treg. Furthermore, a ligand-receptor binding assay showed the preferential binding of C. glabrata β-glucan to CR3. Our data suggest that C. glabrata β-glucan potentially mediates the Treg response, probably through CR3-dependent activation in DCs. This study contributes new insights into immune modulation by C. glabrata that may lead to a better design of novel immunotherapeutic strategies for invasive C. glabrata infection.
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Affiliation(s)
- Areerat Kunanopparat
- Department of Microbiology, Faculty of Dentistry, Center of Excellence in Integrative Immuno-Microbial Biochemistry and Bioresponsive Nanomaterials, Chulalongkorn University, Bangkok, Thailand
- Center of Excellence in Immunology and Immune-Mediated Diseases, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
| | - Truc Thi Huong Dinh
- Department of Microbiology, Faculty of Dentistry, Center of Excellence in Integrative Immuno-Microbial Biochemistry and Bioresponsive Nanomaterials, Chulalongkorn University, Bangkok, Thailand
- Medical Microbiology Interdisciplinary Program, Graduate School, Chulalongkorn University, Bangkok, Thailand
- Department of Pathophysiology and Immunology, Faculty of Medicine, Can Tho University of Medicine and Pharmacy, Vietnam
| | - Pranpariya Ponpakdee
- Department of Chemistry, Faculty of Science, Green Chemistry for Fine Chemical Production and Environmental Remediation Research Unit, Chulalongkorn University, Bangkok, Thailand
| | - Panuwat Padungros
- Department of Chemistry, Faculty of Science, Green Chemistry for Fine Chemical Production and Environmental Remediation Research Unit, Chulalongkorn University, Bangkok, Thailand
| | - Warerat Kaewduangduen
- Department of Microbiology, Faculty of Dentistry, Center of Excellence in Integrative Immuno-Microbial Biochemistry and Bioresponsive Nanomaterials, Chulalongkorn University, Bangkok, Thailand
| | - Kasirapat Ariya-anandech
- Department of Microbiology, Faculty of Dentistry, Center of Excellence in Integrative Immuno-Microbial Biochemistry and Bioresponsive Nanomaterials, Chulalongkorn University, Bangkok, Thailand
| | - Phawida Tummamunkong
- Department of Microbiology, Faculty of Dentistry, Center of Excellence in Integrative Immuno-Microbial Biochemistry and Bioresponsive Nanomaterials, Chulalongkorn University, Bangkok, Thailand
| | - Amanee Samaeng
- Department of Microbiology, Faculty of Dentistry, Center of Excellence in Integrative Immuno-Microbial Biochemistry and Bioresponsive Nanomaterials, Chulalongkorn University, Bangkok, Thailand
| | - Pannagorn Sae-ear
- Faculty of Dentistry, Oral Biology Research Center, Chulalongkorn University, Bangkok, Thailand
| | - Asada Leelahavanichkul
- Department of Microbiology, Faculty of Medicine, Center of Excellence in Translational Research in Inflammation and Immunology (CETRII), Chulalongkorn University, Bangkok, Thailand
| | - Nattiya Hirankarn
- Center of Excellence in Immunology and Immune-Mediated Diseases, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
| | - Patcharee Ritprajak
- Department of Microbiology, Faculty of Dentistry, Center of Excellence in Integrative Immuno-Microbial Biochemistry and Bioresponsive Nanomaterials, Chulalongkorn University, Bangkok, Thailand
- Department of Microbiology, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
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Buntasana S, Padungros P. Glycosylation of n-pentenyl glycosides using bromodiethylsulfonium salt as an activator: interception of the glycosyl intermediate by chloride ion transfer. Org Biomol Chem 2023; 22:126-143. [PMID: 38051124 DOI: 10.1039/d3ob01618h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2023]
Abstract
Utilization of n-pentenyl glycosides (NPGs) in modern carbohydrate synthesis may be hindered by their sluggish activation, which results from reversible halogenation and cyclization processes. Bromodiethylsulfonium bromopentachloroantimonate (BDSB) has been previously shown to be a powerful brominating agent for the cation-π polyene cyclization of less reactive and electron-poor polyenes. This study demonstrates the activation of NPGs using BDSB as a powerful brominating agent. BDSB effectively activates the terminal olefins of NPGs and the reaction proceeds through 5-exo-tet cyclization, offering a rapid and mild approach for glycosylation with a wide range of glycosyl donors, including n-pentenyl mannoside, n-pentenyl galactoside, and n-pentenyl glucoside. The success of this approach derives from the chloride ion transfer from the nonnucleophilic SbCl5Br anion to the glycosyl intermediate, which disrupts the equilibrium and produces a glycosyl chloride intermediate that is smoothly converted to 22 coupling products, with yields ranging from moderate to excellent (49-100%). The β-selective glycosylation is accomplished when employing NPGs equipped with a neighboring participating group. The practicality of the BDSB-activated glycosylation is demonstrated by a gram-scale synthesis. This study showcases BDSB as a potent activator for NPG glycosylation through the interception of a glycosyl intermediate that diminishes the equilibration during halogenation and 5-exo-tet cyclization.
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Affiliation(s)
- Supanat Buntasana
- Green Chemistry for Fine Chemical Production and Environmental Remediation Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok 10330, Thailand.
| | - Panuwat Padungros
- Green Chemistry for Fine Chemical Production and Environmental Remediation Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok 10330, Thailand.
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Escopy S, Demchenko AV. Transition-Metal-Mediated Glycosylation with Thioglycosides. Chemistry 2021; 28:e202103747. [PMID: 34935219 DOI: 10.1002/chem.202103747] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2021] [Indexed: 11/09/2022]
Abstract
Thioglycosides are among the most common glycosyl donors that find broad application in the synthesis of glycans and glycoconjugates. However, the requirement for toxic and/or large access of activators needed for common glycosylations with thioglycosides remains a notable drawback. Due to the increased awareness of the chemical waste impact on the environment, synthetic studies have been driven by the goal of finding non-toxic reagents. The main focus of this review is to highlight recent methods for thioglycoside activation that rely on transition metal catalysis.
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Affiliation(s)
- Samira Escopy
- University of Missouri - St. Louis, Chemistry, UNITED STATES
| | - Alexei V Demchenko
- Saint Louis University, Chemistry, 3501 Laclede Ave, 63103, St. Louis, UNITED STATES
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4
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Buntasana S, Seankongsuk P, Vilaivan T, Padungros P. Household Ozone Disinfector as An Alternative Ozone Generator for Ozonolysis of Alkenes. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Supanat Buntasana
- Green Chemistry for Fine Chemical Productions STAR Department of Chemistry Faculty of Science Chulalongkorn University Phayathai Road, Pathumwan Bangkok 10330 Thailand
| | - Pattarakiat Seankongsuk
- Organic Synthesis Research Unit Department of Chemistry Faculty of Science Chulalongkorn University Phayathai Road, Pathumwan Bangkok 10330 Thailand
| | - Tirayut Vilaivan
- Organic Synthesis Research Unit Department of Chemistry Faculty of Science Chulalongkorn University Phayathai Road, Pathumwan Bangkok 10330 Thailand
| | - Panuwat Padungros
- Green Chemistry for Fine Chemical Productions STAR Department of Chemistry Faculty of Science Chulalongkorn University Phayathai Road, Pathumwan Bangkok 10330 Thailand
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5
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Ratthachag T, Buntasana S, Vilaivan T, Padungros P. Surfactant-mediated thioglycosylation of 1-hydroxy sugars in water. Org Biomol Chem 2021; 19:822-836. [PMID: 33403378 DOI: 10.1039/d0ob02246b] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Thioglycosides are an important class of sugars, since they can be used as non-ionic biosurfactants, biomimetic glycosides, and building blocks for carbohydrate synthesis. Previously, Brønsted- or Lewis-acid-catalyzed dehydrative glycosylations between a 1-hydroxy sugar and a thiol have been reported to yield open-chain dithioacetal sugars as the major products instead of the desired thioglycosides. These dithioacetal sugars are by-products derived from the endocyclic bond cleavage of the thioglycosides. Herein, we report dehydrative glycosylation in water mediated by a Brønsted acid-surfactant combined catalyst (BASC). Glycosylations between 1-hydroxy furanosyl/pyranosyl sugars and primary, secondary, and tertiary aliphatic/aromatic thiols in the presence of dodecyl benzenesulfonic acid (DBSA) provided the thioglycoside products in moderate to good yields. Microwave irradiation led to improvements in the yields and a shortening of the reaction time. Remarkably, open-chain dithioacetal sugars were not detected in the DBSA-mediated glycosylations in water. This method is a simple, convenient, and rapid approach to produce a library of thioglycosides without the requirement of anhydrous conditions. Moreover, this work also provides an excellent example of complementary reactivity profiles of glycosylation in organic solvents and water.
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Affiliation(s)
- Trichada Ratthachag
- Organic Synthesis Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok 10330, Thailand
| | - Supanat Buntasana
- Green Chemistry for Fine Chemical Productions STAR, Department of Chemistry, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok 10330, Thailand.
| | - Tirayut Vilaivan
- Organic Synthesis Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok 10330, Thailand
| | - Panuwat Padungros
- Green Chemistry for Fine Chemical Productions STAR, Department of Chemistry, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok 10330, Thailand.
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6
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Dinh TTH, Tummamunkong P, Padungros P, Ponpakdee P, Boonprakong L, Saisorn W, Leelahavanichkul A, Kueanjinda P, Ritprajak P. Interaction Between Dendritic Cells and Candida krusei β-Glucan Partially Depends on Dectin-1 and It Promotes High IL-10 Production by T Cells. Front Cell Infect Microbiol 2021; 10:566661. [PMID: 33552998 PMCID: PMC7862133 DOI: 10.3389/fcimb.2020.566661] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Accepted: 11/27/2020] [Indexed: 12/12/2022] Open
Abstract
Host-Candida interaction has been broadly studied during Candida albicans infection, with a progressive shift in focus toward non-albicans Candida species. C. krusei is an emerging multidrug resistant pathogen causing rising morbidity and mortality worldwide. Therefore, understanding the interplay between the host immune system and C. krusei is critically important. Candia cell wall β-glucans play significant roles in the induction of host protective immune responses. However, it remains unclear how C. krusei β-glucan impacts dendritic cell (DC) responses. In this study, we investigated DC maturation and function in response to β-glucans isolated from the cell walls of C. albicans, C. tropicalis, and C. krusei. These three distinct Candida β-glucans had differential effects on expression of the DC marker, CD11c, and on DC maturation. Furthermore, bone-marrow derived DCs (BMDCs) showed enhanced cytokine responses characterized by substantial interleukin (IL)-10 production following C. krusei β-glucan stimulation. BMDCs stimulated with C. krusei β-glucan augmented IL-10 production by T cells in tandem with increased IL-10 production by BMDCs. Inhibition of dectin-1 ligation demonstrated that the interactions between dectin-1 on DCs and cell wall β-glucans varied depending on the Candida species. The effects of C. krusei β-glucan were partially dependent on dectin-1, and this dependence, in part, led to distinct DC responses. Our study provides new insights into immune regulation by C. krusei cell wall components. These data may be of use in the development of new clinical approaches for treatment of patients with C. krusei infection.
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Affiliation(s)
- Truc Thi Huong Dinh
- Medical Microbiology Interdisciplinary Program, Graduate School, Chulalongkorn University, Bangkok, Thailand
- Research Unit in Integrative Immuno-Microbial Biochemistry and Bioresponsive Nanomaterials, Department of Microbiology, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Phawida Tummamunkong
- Research Unit in Integrative Immuno-Microbial Biochemistry and Bioresponsive Nanomaterials, Department of Microbiology, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Panuwat Padungros
- Green Chemistry for Fine Chemical Productions STAR, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
| | - Pranpariya Ponpakdee
- Green Chemistry for Fine Chemical Productions STAR, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
| | - Lawan Boonprakong
- Oral Biology Research Center, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Wilasinee Saisorn
- Translational Research in Inflammation and Immunology Research Unit (TRIRU), Department of Microbiology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
| | - Asada Leelahavanichkul
- Translational Research in Inflammation and Immunology Research Unit (TRIRU), Department of Microbiology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
| | - Patipark Kueanjinda
- Department of Microbiology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
| | - Patcharee Ritprajak
- Research Unit in Integrative Immuno-Microbial Biochemistry and Bioresponsive Nanomaterials, Department of Microbiology, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
- Department of Microbiology, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
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7
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Tomita S, Tanaka M, Inoue M, Inaba K, Takahashi D, Toshima K. Diboron-Catalyzed Regio- and 1,2- cis-α-Stereoselective Glycosylation of trans-1,2-Diols. J Org Chem 2020; 85:16254-16262. [PMID: 33052679 DOI: 10.1021/acs.joc.0c02093] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Regio- and 1,2-cis-α-stereoselective glycosylations were investigated using 1,2-anhydroglucose donors and trans-1,2-diol sugar acceptors in the presence of a diboron catalyst. The reactions proceeded smoothly to provide the corresponding 1,2-cis-α-glycosides with consistently very high stereoselectivity and were regioselectivity controlled by the protecting groups of the acceptor. The present glycosylation method was applied successfully to the efficient synthesis of α-1,3-glucan pentasaccharide.
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Affiliation(s)
- Shunpei Tomita
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Masamichi Tanaka
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Michitaka Inoue
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Kazuki Inaba
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Daisuke Takahashi
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Kazunobu Toshima
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
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8
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Dutta S, Saha A. Aryldithiocarbamates as thiol alternatives in Cu-catalyzed C(aryl)-S coupling reactions using aryldiazonium tetrafluoroborate salts. Org Biomol Chem 2019; 17:9360-9366. [PMID: 31620766 DOI: 10.1039/c9ob01976f] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
An efficient method for the synthesis of unsymmetrical diaryl sulfides has been developed by the C-S cross coupling of aryldithiocarbamates and aryldiazonium salts in the presence of CuI-2,2'-bipyridine and Zn. Aryldithiocarbamate compounds have been used here as thiol substitutes. The protocol shows wide substrate scope and good yields of the products.
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Affiliation(s)
- Soumya Dutta
- Department of Chemistry, Jadavpur University, Kolkata 700032, India.
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9
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Stereoselective oxidative glycosylation of anomeric nucleophiles with alcohols and carboxylic acids. Nat Commun 2018; 9:3650. [PMID: 30194299 PMCID: PMC6128909 DOI: 10.1038/s41467-018-06016-4] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Accepted: 08/03/2018] [Indexed: 11/10/2022] Open
Abstract
Oligosaccharides, one of the most abundant biopolymers, are involved in numerous biological processes. Although many efforts have been put in preparative carbohydrate chemistry, achieving optimal anomeric and regioselectivities remains challenging. Herein we describe an oxidative glycosylation method between anomeric stannanes and oxygen nucleophiles resulting in the formation of a C−O bond with consistently high anomeric control for glycosyl donors bearing a free C2-hydroxyl group. These reactions are promoted by hypervalent iodine reagents with catalytic or stoichiometric amounts of Cu or Zn salts. The generality of this transformation is demonstrated in 42 examples. Mechanistic studies indicate that the oxidative glycosylation is initiated by the hydroxyl-guided delivery of the hypervalent iodine and tosylate into the anomeric position, and results in excellent 1,2-trans selectivity. The unique mechanistic paradigm, high selectivities, and mild reaction conditions make this method suitable for the synthesis of oligosaccharides and for integration with other methodologies such as automated synthesis. Glycosylation of partially protected sugars is usually limited by suboptimal regio- and stereo-selectivities. Here, the authors show a general oxidative glycosylation between anomeric stannanes with a nonprotected hydroxyl group and oxygen nucleophiles, additionally providing mechanistic insights into the origin of selectivity.
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10
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Li G, Noguchi M, Kashiwagura H, Tanaka Y, Serizawa K, Shoda SI. Protection-free synthesis of glycosyl dithiocarbamates in aqueous media by using 2-chloroimidazolinium reagent. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.06.106] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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11
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Abstract
Oxidation-sensitive N,N-diaryl dithiocarbamates (DTCs) are synthesized in good yields by the generation of metal amide salts from N-benzoyl precursors, followed by addition of CS2. para-Substituted diphenylamines are prepared by electrophilic aromatic substitution of diphenylbenzamide and saponification. Deacylation of electron-rich species such as bis(p-dimethylaminophenyl)benzamide is challenging because of the oxidative sensitivity of the anionic intermediate but could be achieved in good yield by using n-BuLi to generate a hemiaminal adduct, prior to acidification. The N,N-diaryl DTCs are stable as alkali salts and can be used to produce densely packed monolayers on gold surfaces.
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Affiliation(s)
- Panuwat Padungros
- Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
| | - Alexander Wei
- Department of Chemistry, Purdue University, West Lafayette, Indiana, USA
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12
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Padungros P, Fan RH, Casselman MD, Cheng G, Khatri HR, Wei A. Synthesis and reactivity of 4'-deoxypentenosyl disaccharides. J Org Chem 2014; 79:4878-91. [PMID: 24797640 PMCID: PMC4059249 DOI: 10.1021/jo500449h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Indexed: 11/29/2022]
Abstract
4-Deoxypentenosides (4-DPs) are versatile synthons for rare or higher-order pyranosides, and they provide an entry for structural diversification at the C5 position. Previous studies have shown that 4-DPs undergo stereocontrolled DMDO oxidation; subsequent epoxide ring-openings with various nucleophiles can proceed with both anti or syn selectivity. Here, we report the synthesis of α- and β-linked 4'-deoxypentenosyl (4'-DP) disaccharides, and we investigate their post-glycosylational C5' additions using the DMDO oxidation/ring-opening sequence. The α-linked 4'-DP disaccharides were synthesized by coupling thiophenyl 4-DP donors with glycosyl acceptors using BSP/Tf2O activation, whereas β-linked 4'-DP disaccharides were generated by the decarboxylative elimination of glucuronyl disaccharides under microwave conditions. Both α- and β-linked 4'-DP disaccharides could be epoxidized with high stereoselectivity using DMDO. In some cases, the α-epoxypentenosides could be successfully converted into terminal l-iduronic acids via the syn addition of 2-furylzinc bromide. These studies support a novel approach to oligosaccharide synthesis, in which the stereochemical configuration of the terminal 4'-DP unit is established at a post-glycosylative stage.
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Affiliation(s)
| | | | - Matthew D. Casselman
- Department of Chemistry, Purdue
University, 560 Oval
Drive, West Lafayette, Indiana 47907-2084, United States
| | - Gang Cheng
- Department of Chemistry, Purdue
University, 560 Oval
Drive, West Lafayette, Indiana 47907-2084, United States
| | - Hari R. Khatri
- Department of Chemistry, Purdue
University, 560 Oval
Drive, West Lafayette, Indiana 47907-2084, United States
| | - Alexander Wei
- Department of Chemistry, Purdue
University, 560 Oval
Drive, West Lafayette, Indiana 47907-2084, United States
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13
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Padungros P, Alberch L, Wei A. Glycosyl dithiocarbamates: β-selective couplings without auxiliary groups. J Org Chem 2014; 79:2611-24. [PMID: 24548247 PMCID: PMC3985838 DOI: 10.1021/jo500032k] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2014] [Indexed: 01/04/2023]
Abstract
In this article, we evaluate glycosyl dithiocarbamates (DTCs) with unprotected C2 hydroxyls as donors in β-linked oligosaccharide synthesis. We report a mild, one-pot conversion of glycals into β-glycosyl DTCs via DMDO oxidation with subsequent ring opening by DTC salts, which can be generated in situ from secondary amines and CS2. Glycosyl DTCs are readily activated with Cu(I) or Cu(II) triflate at low temperatures and are amenable to reiterative synthesis strategies, as demonstrated by the efficient construction of a tri-β-1,6-linked tetrasaccharide. Glycosyl DTC couplings are highly β-selective despite the absence of a preexisting C2 auxiliary group. We provide evidence that the directing effect is mediated by the C2 hydroxyl itself via the putative formation of a cis-fused bicyclic intermediate.
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Affiliation(s)
| | - Laura Alberch
- Department
of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United
States
| | - Alexander Wei
- Department
of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United
States
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14
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Megia-Fernandez A, de la Torre-Gonzalez D, Parada-Aliste J, Lopez-Jaramillo FJ, Hernandez-Mateo F, Santoyo-Gonzalez F. Masked Thiol Sugars: Chemical Behavior and Synthetic Applications ofS-Glycopyranosyl-N-monoalkyl Dithiocarbamates. Chem Asian J 2013; 9:620-31. [DOI: 10.1002/asia.201301270] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Indexed: 01/14/2023]
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