1
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Yamada Y, Yoshinaga R, Matsui Y, Nagatomo M, Fujino H, Inoue M. Et 3Al/Light-Promoted Radical-Polar Crossover Reactions of α-Alkoxyacyl Tellurides. J Org Chem 2024; 89:11701-11706. [PMID: 39110480 DOI: 10.1021/acs.joc.4c01445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/17/2024]
Abstract
Here, we report new radical-polar crossover reactions of α-alkoxy carbon radicals for constructing highly oxygenated molecules with contiguous stereocenters. The method employs a 370 nm UV light-emitting diode (LED) for the photoexcitation of α-alkoxyacyl telluride, and Et3Al as the radical initiator and terminator. First, Et3Al and UV LED promoted radical coupling between the α-alkoxyacyl telluride and cyclopentenone via C-Te bond homolysis, CO expulsion, and C-C bond formation. Second, Et3Al converted the radical species to the corresponding aluminum enolate. Third, the second C-C bond formation occurred via a polar mechanism: intermolecularly with aldehydes/ketones and intramolecularly with epoxide, producing aldol and SN2 adducts, respectively. The present coupling reactions increase the molecular complexity in a single step by stereoselective formation of the two hindered C-C bonds. The devised method is expected to be useful for the expeditious assembly of densely oxygenated natural products.
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Affiliation(s)
- Yutaro Yamada
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Risa Yoshinaga
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Yuki Matsui
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Masanori Nagatomo
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Haruka Fujino
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Masayuki Inoue
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
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2
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Ghosh T, Nokami T. Recent development of stereoselective C-glycosylation via generation of glycosyl radical. Carbohydr Res 2022; 522:108677. [DOI: 10.1016/j.carres.2022.108677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Revised: 08/31/2022] [Accepted: 09/07/2022] [Indexed: 11/27/2022]
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3
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Montes AS, León EI, Martin A, Pérez-Martín I, Suárez E. Free‐Radical Epimerization of D‐ into L‐C‐(glycosyl)methanol Compounds Using 1,5‐Hydrogen Atom Transfer Reaction. European J Org Chem 2022. [DOI: 10.1002/ejoc.202101391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Adrián S. Montes
- IPNA: Instituto de Productos Naturales y Agrobiologia Síntesis de Productos Naturales Avda. Astrofisico Francisco Sanchez 3 38206 La Laguna SPAIN
| | - Elisa I León
- IPNA: Instituto de Productos Naturales y Agrobiologia Síntesis de Productos Naturales Avda. Astrofisico Francisco Sanchez 3 38206 La Laguna SPAIN
| | - Angeles Martin
- Instituto de Productos Naturales Y Agrobiolog�a, CSIC Sintesis de Productos Naturales Avda. Astrofisico Fco. Sanchez 3 38205 La Laguna SPAIN
| | - Inés Pérez-Martín
- IPNA: Instituto de Productos Naturales y Agrobiologia Síntesis de Productos Naturales Avda. Astrofisico Francisco Sanchez 3 38206 La Laguna SPAIN
| | - Ernesto Suárez
- IPNA: Instituto de Productos Naturales y Agrobiologia Síntesis de Productos Naturales Avda. Astrofisico Francisco Sanchez 3 38206 La Laguna SPAIN
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4
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Turner JA, Adrianov T, Zakaria MA, Taylor MS. Effects of Configuration and Substitution on C-H Bond Dissociation Enthalpies in Carbohydrate Derivatives: A Systematic Computational Study. J Org Chem 2021; 87:1421-1433. [PMID: 34964632 DOI: 10.1021/acs.joc.1c02725] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Density functional theory was used to calculate C-H bond dissociation enthalpies (BDEs) at each position of a diverse collection of pyranosides and furanosides differing in relative configuration and substitution patterns. A detailed analysis of the resulting data set (186 BDEs, calculated at the M06-2X/def2-TZVP level of theory) highlights the ways in which stereoelectronic effects, conformational properties, and noncovalent interactions can influence the strengths of C-H bonds in carbohydrates. The results point toward opportunities to alter the radical reactivity of carbohydrate derivatives by variation of their stereochemical configuration or the positions and types of protective groups.
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Affiliation(s)
- Julia A Turner
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6 Canada
| | - Timur Adrianov
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6 Canada
| | - Mia Ahed Zakaria
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6 Canada
| | - Mark S Taylor
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6 Canada
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5
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Kuwana D, Komori Y, Nagatomo M, Inoue M. Photoinduced Decarboxylative Radical Coupling Reaction of Multiply Oxygenated Structures by Catalysis of Pt-Doped TiO 2. J Org Chem 2021; 87:730-736. [PMID: 34936365 DOI: 10.1021/acs.joc.1c02736] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new reaction system was devised for decarboxylative radical coupling reactions by heterogeneous semiconductor photoredox catalysis. When an α-alkoxy carboxylic acid and Pt-doped TiO2 in EtOAc were irradiated with a violet light-emitting diode at room temperature, the photogenerated electron hole of TiO2 oxidatively induced the ejection of CO2 via the formation of a carboxyl radical to produce the corresponding α-alkoxy radical. C(sp3)-C(sp3) bond formation between the radicals led to dimers with reductive conversion of protons to H2 by the photogenerated electron. Alternatively, in the presence of an electron-deficient olefin, an intermolecular radical addition reaction occurred, resulting in the formation of a 1,4-adduct via single-electron reduction and subsequent protonation. These operationally simple and mild transformations are amenable to the one-step assembly of densely oxygenated linear and branched carbon chains.
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Affiliation(s)
- Daiki Kuwana
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Yuma Komori
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Masanori Nagatomo
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Masayuki Inoue
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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6
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Fujino H, Nagatomo M, Inoue M. Total Syntheses of Hikosamine and Hikizimycin. J Org Chem 2021; 86:16220-16230. [PMID: 34569228 DOI: 10.1021/acs.joc.1c01773] [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
Hikizimycin (1) is a potent anthelmintic and antibacterial natural product. The core 4-amino-4-deoxyundecose sugar (hikosamine) of 1 consists of an 11-carbon linear chain substituted with one amino group and 10 hydroxy groups. The C1 and C6O positions of the 10 contiguous stereocenters are further appended by a cytosine base and a 3-amino-3-deoxyglucose sugar (kanosamine), respectively. Since the structural determination in the early 1970s, synthetic chemists have been attracted by this exceedingly complex structure and have investigated the full chemical construction of 1. These synthetic efforts culminated in four syntheses of the protected hikosamines and two total syntheses of 1. In this Perspective, we summarize the strategies and tactics utilized in these syntheses to showcase the evolution of modern natural product synthesis.
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Affiliation(s)
- Haruka Fujino
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Masanori Nagatomo
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Masayuki Inoue
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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7
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Homolya L, Juhász L, Somsák L. Halogen addition to some 1-C-substituted pyranoid glycals. Carbohydr Res 2021; 504:108292. [PMID: 33940310 DOI: 10.1016/j.carres.2021.108292] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Revised: 03/11/2021] [Accepted: 03/12/2021] [Indexed: 11/21/2022]
Abstract
Addition of bromine and chlorine to O-peracylated 1-CN-, COOMe- and CONH2-substituted glycals was studied under ionic and radical conditions. The main or exclusive products were the corresponding 2,3-trans-diaxial (3-bromo-3-deoxy-α-d-heptopyranosylbromide)onic acid derivatives. Bromination of the O-peracetylated d-lyxo-hept-2-enopyranosononitrile and all chlorinations proved selective towards the 2-axial-3-equatorial (3-halogeno-3-deoxy-α-d-heptopyranosylhalide)onic acid derivatives. Silver triflate promoted glycosylation of methanol was successful with each 2,3-trans-diaxial (3-bromo-3-deoxy-α-d-heptopyranosylbromide)onic acid derivative, however, several attempted nucleophilic substitution and elimination reactions gave the parent glycal only.
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Affiliation(s)
- Levente Homolya
- Department of Organic Chemistry, University of Debrecen, POB 400, H-4002, Debrecen, Hungary
| | - László Juhász
- Department of Organic Chemistry, University of Debrecen, POB 400, H-4002, Debrecen, Hungary
| | - László Somsák
- Department of Organic Chemistry, University of Debrecen, POB 400, H-4002, Debrecen, Hungary.
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8
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Nagatomo M, Inoue M. Convergent Assembly of Highly Oxygenated Natural Products Enabled by Intermolecular Radical Reactions. Acc Chem Res 2021; 54:595-604. [PMID: 33406830 DOI: 10.1021/acs.accounts.0c00792] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Natural products with a high ratio of sp3-hybridized atoms and oxygen-substituted stereogenic centers represent privileged structures for the development of pharmaceuticals and chemical probes. The multiple oxygen functionalities of these natural products endow their potent and selective biological activities, although they significantly heighten the challenge of their chemical assemblies. We focused on developing efficient strategies for the total syntheses of this biologically and chemically important class of molecules. A convergent strategy is more advantageous than a linear strategy for designing a shorter synthetic route because a convergent strategy enables direct coupling of functionalized fragments whereas a linear strategy involves stepwise construction of a molecule from its terminus. Radical reactions are preferred over polar reactions for the coupling of heavily functionalized and sp3-rich fragments, as they allow for C(sp3)-C(sp3) coupling without damaging diverse polar functional groups. With these considerations in mind, we designed radical-based convergent strategies for assembling highly oxygenated natural products. Here we summarize the concise total syntheses of asimicin (1, antibiotic activity), 1-hydroxytaxinine (2, cytotoxicity), polyoxins (3, antifungal activity), and hikizimycin (4, anthelmintic activity) as representative examples. Retrosynthetic disconnection at the central part of these molecules produces highly substituted α-alkoxy radicals as synthons. In the synthetic direction, the α-alkoxy radicals were generated from the corresponding α-alkoxyacyl tellurides in a unified fashion, and then utilized for four distinct coupling reactions. Formation of the Et radical from Et3B and O2 homolytically cleaves the C-Te bond of α-alkoxyacyl telluride, and the facile expulsion of carbon monoxide from the acyl radical leads to the α-alkoxy radical. Dimerization of the stabilized α-alkoxy radical resulted in the core structure of 1 with 10 contiguous stereocenters. The coupling adduct was derivatized to 1 through the attachment of two different carbon chains (17 steps as the longest linear sequence). Alternatively, intermolecular addition reactions of the α-alkoxy radicals to electron-deficient C═C, C═N, and C═O bonds, followed by Et3B-mediated radical termination, led to the core structures of 2, 3, and 4, respectively. Intermolecular coupling between the α-alkoxy radical and the cyclohexenone derivative and intramolecular pinacol coupling gave rise to the 6/8/6-fused ring system of 2, which was transformed to 2 (26 steps). The two amino acid moieties of 3 were prepared by combining the α-alkoxy radical and the oxime and were then condensed to complete the synthesis of 3 (11 steps). Furthermore, a combination of α-alkoxyacyl telluride and Et3B/O2 realized a novel addition reaction of α-alkoxy radicals to aldehydes. This method was incorporated in the construction of the core 4-amino-5-deoxyundecose with 10 contiguous stereocenters, which was fabricated with two appendage structures to deliver 4. The four total syntheses described here demonstrate the versatility and robustness of intermolecular radical reactions. These syntheses will also provide new insights for retrosynthetic analyses in the field of organic chemistry and streamline synthetic routes to various bioactive natural products with multiple oxygen functionalities.
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Affiliation(s)
- Masanori Nagatomo
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Masayuki Inoue
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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9
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Chen P, Wang P, Long Q, Ding H, Cheng G, Li T, Li M. Synthesis of Reverse Glycosyl Fluorides and Rare Glycosyl Fluorides Enabled by Radical Decarboxylative Fluorination of Uronic Acids. Org Lett 2020; 22:9325-9330. [PMID: 33226829 DOI: 10.1021/acs.orglett.0c03514] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
An efficient protocol for synthesizing reverse glycosyl fluorides is described, relying on silver-promoted decarboxylative fluorination of structurally diverse pentofuran- and hexopyranuronic acids under the mild reaction conditions. The potential applications of the reaction are further demonstrated by converting readily available d-uronic acid derivatives into uncommon d-/l-glycosyl fluorides through a C1-to-C5 switch strategy. The reaction mechanism is corroborated by 5-exo-trig radical cyclization of allyl α-d-C-glucopyranuronic acid triggered by decarboxylative fluorination.
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Affiliation(s)
- Pengwei Chen
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China.,Hainan Key Laboratory for Research and Development of Natural Products from Li Folk Medicine, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China
| | - Peng Wang
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Qing Long
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Han Ding
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Guoqiang Cheng
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Tiantian Li
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Ming Li
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China.,Laboratory for Marine Drugs and Bioproducts, Pilot National Laboratory for Marine Science and Technology, Qingdao 266237, China.,Shandong Provincial Key Laboratory of Glycoscience and Glycotechnology, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
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10
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Nagatomo M, Zhang K, Fujino H, Inoue M. Et 3 B/Et 2 AlCl/O 2 -Mediated Radical Coupling Reaction between α-Alkoxyacyl Tellurides and 2-Hydroxybenzaldehyde Derivatives. Chem Asian J 2020; 15:3820-3824. [PMID: 33006274 DOI: 10.1002/asia.202001090] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Revised: 10/01/2020] [Indexed: 12/19/2022]
Abstract
A newly devised radical-based strategy enabled coupling between multiply oxygenated α-alkoxyacyl tellurides and 2-hydroxybenzaldehyde derivatives. A reagent combination of Et3 B, Et2 AlCl, and O2 promoted the formation of the α-alkoxy carbon radical from the α-alkoxyacyl telluride and the addition of the radical to the carbonyl group of 2-hydroxybenzaldehyde. The reaction chemo- and stereoselectively forged the hindered C-C bond between two oxygen-functionalized carbons at ambient temperature. The method was applied to the preparation of 12 coupling adducts with three to six contiguous stereocenters and to the concise synthesis of an antitumor compound, LLY-283.
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Affiliation(s)
- Masanori Nagatomo
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Keshu Zhang
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Haruka Fujino
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Masayuki Inoue
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
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11
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Fukuda T, Nagatomo M, Inoue M. Total Synthesis of Diospyrodin and Its Three Diastereomers. Org Lett 2020; 22:6468-6472. [PMID: 32806173 DOI: 10.1021/acs.orglett.0c02280] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Antibacterial diospyrodin (1) was synthesized in 13 steps. Et3B and O2 promoted the formation of an α-alkoxy carbon radical from l-ribose-derived α-alkoxyacyl telluride 5, which reacted with d-glucose-derived aldehyde 4. The radical addition realized the convergent assembly of the contiguously hydroxylated carbon-chain of 3-α and greatly contributed to streamlining the synthetic route. Compound 3-α was transformed not only to 1 but also to its three diastereomers by functional group manipulations.
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Affiliation(s)
- Takumi Fukuda
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Masanori Nagatomo
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Masayuki Inoue
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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12
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Fujino H, Fukuda T, Nagatomo M, Inoue M. Convergent Total Synthesis of Hikizimycin Enabled by Intermolecular Radical Addition to Aldehyde. J Am Chem Soc 2020; 142:13227-13234. [PMID: 32628018 DOI: 10.1021/jacs.0c06354] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Hikizimycin (1), which exhibits powerful anthelmintic activity, has the most densely functionalized structure among nucleoside antibiotics. A central 4-amino-4-deoxyundecose of 1 possesses 10 contiguous stereocenters on a C1-C11 linear chain and is decorated with a cytosine base at C1 and a 3-amino-3-deoxyglucose at C6-OH. These distinctive structural features of 1 make it an extremely challenging target for de novo construction. Herein, we report a convergent total synthesis of 1 from four known components: 3-azide-3-deoxyglucose derivative 4, bis-TMS-cytosine 5, d-mannose 9, and d-galactose derivative 10. We first designed and devised a novel radical coupling reaction between multiply hydroxylated aldehydes and α-alkoxyacyl tellurides. The generality and efficiency of this process was demonstrated by the coupling of 7c and 8, which were readily accessible from two hexoses, 9 and 10, respectively. Et3B and O2 rapidly induced decarbonylative radical formation from α-alkoxyacyl telluride 8, and intermolecular addition of the generated α-alkoxy radical to aldehyde 7c yielded 4-amino-4-deoxyundecose 6-α with installation of the desired C5,6-stereocenters. Subsequent attachments of the cytosine with 5 and of the 3-azide-3-deoxyglucose with 4 were realized through selective activation of the C1-acetal and selective deprotection of the C6-hydroxy group. Finally, the 3 amino and 10 hydroxy groups were liberated in a single step to deliver the target 1. Thus, the combination of the newly developed radical-coupling and protective-group strategies minimized the functional group manipulations and thereby enabled the synthesis of 1 from 10 in only 17 steps. The present total synthesis demonstrates the versatility of intermolecular radical addition to aldehyde for the first time and offers a new strategic design for multistep target-oriented syntheses of various nucleoside antibiotics and other bioactive natural products.
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Affiliation(s)
- Haruka Fujino
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Takumi Fukuda
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Masanori Nagatomo
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Masayuki Inoue
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
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13
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Abstract
Radical reactions have found many applications in carbohydrate chemistry, especially in the construction of carbon–carbon bonds. The formation of carbon–heteroatom bonds has been less intensively studied. This mini-review will summarize the efforts to add heteroatom radicals to unsaturated carbohydrates like endo-glycals. Starting from early examples, developed more than 50 years ago, the importance of such reactions for carbohydrate chemistry and recent applications will be discussed. After a short introduction, the mini-review is divided in sub-chapters according to the heteroatoms halogen, nitrogen, phosphorus, and sulfur. The mechanisms of radical generation by chemical or photochemical processes and the subsequent reactions of the radicals at the 1-position will be discussed. This mini-review cannot cover all aspects of heteroatom-centered radicals in carbohydrate chemistry, but should provide an overview of the various strategies and future perspectives.
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14
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Zhou X, Ding H, Chen P, Liu L, Sun Q, Wang X, Wang P, Lv Z, Li M. Radical Dehydroxymethylative Fluorination of Carbohydrates and Divergent Transformations of the Resulting Reverse Glycosyl Fluorides. Angew Chem Int Ed Engl 2020; 59:4138-4144. [PMID: 31850616 DOI: 10.1002/anie.201914557] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Indexed: 12/22/2022]
Abstract
A mild and convenient method for the synthesis of reverse glycosyl fluorides (RGFs) has been developed that is based on the silver-promoted radical dehydroxymethylative fluorination of carbohydrates. A salient feature of the reaction is that furanoid and pyranoid carbohydrates furnish structurally diverse RGFs bearing a wide variety of functional groups in good to excellent yields. Intramolecular hydrogen atom transfer experiments revealed that the reaction involves an underexploited radical fluorination that proceeds via β-fragmentation of sugar-derived primary alkoxyl radicals. Structurally divergent RGFs were obtained by catalytic C-F bond activation, and our method thus offers a concise and efficient strategy for the synthesis of reverse glycosides by late-stage diversification of RGFs. The potential of this method is showcased by the preparation and diversification of sotagliflozin, leading to the discovery of a promising SGLT2 inhibitor candidate.
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Affiliation(s)
- Xin Zhou
- School of Medicine and Pharmacy, Key Laboratory of Marine Medicine, Chinese Ministry of Education, Ocean University of China, 5 Yushan Road, Qingdao, 266003, P. R. China
| | - Han Ding
- School of Medicine and Pharmacy, Key Laboratory of Marine Medicine, Chinese Ministry of Education, Ocean University of China, 5 Yushan Road, Qingdao, 266003, P. R. China
| | - Pengwei Chen
- School of Medicine and Pharmacy, Key Laboratory of Marine Medicine, Chinese Ministry of Education, Ocean University of China, 5 Yushan Road, Qingdao, 266003, P. R. China.,Hainan Key Laboratory for Research and Development of Natural Products from Li Folk Medicine, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou, 571101, P. R. China
| | - Li Liu
- School of Medicine and Pharmacy, Key Laboratory of Marine Medicine, Chinese Ministry of Education, Ocean University of China, 5 Yushan Road, Qingdao, 266003, P. R. China
| | - Qikai Sun
- School of Medicine and Pharmacy, Key Laboratory of Marine Medicine, Chinese Ministry of Education, Ocean University of China, 5 Yushan Road, Qingdao, 266003, P. R. China
| | - Xianyang Wang
- School of Medicine and Pharmacy, Key Laboratory of Marine Medicine, Chinese Ministry of Education, Ocean University of China, 5 Yushan Road, Qingdao, 266003, P. R. China
| | - Peng Wang
- School of Medicine and Pharmacy, Key Laboratory of Marine Medicine, Chinese Ministry of Education, Ocean University of China, 5 Yushan Road, Qingdao, 266003, P. R. China
| | - Zhihua Lv
- School of Medicine and Pharmacy, Key Laboratory of Marine Medicine, Chinese Ministry of Education, Ocean University of China, 5 Yushan Road, Qingdao, 266003, P. R. China.,Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237, P. R. China
| | - Ming Li
- School of Medicine and Pharmacy, Key Laboratory of Marine Medicine, Chinese Ministry of Education, Ocean University of China, 5 Yushan Road, Qingdao, 266003, P. R. China.,Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237, P. R. China
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15
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Zhou X, Ding H, Chen P, Liu L, Sun Q, Wang X, Wang P, Lv Z, Li M. Radical Dehydroxymethylative Fluorination of Carbohydrates and Divergent Transformations of the Resulting Reverse Glycosyl Fluorides. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201914557] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Xin Zhou
- School of Medicine and Pharmacy Key Laboratory of Marine Medicine Chinese Ministry of Education Ocean University of China 5 Yushan Road Qingdao 266003 P. R. China
| | - Han Ding
- School of Medicine and Pharmacy Key Laboratory of Marine Medicine Chinese Ministry of Education Ocean University of China 5 Yushan Road Qingdao 266003 P. R. China
| | - Pengwei Chen
- School of Medicine and Pharmacy Key Laboratory of Marine Medicine Chinese Ministry of Education Ocean University of China 5 Yushan Road Qingdao 266003 P. R. China
- Hainan Key Laboratory for Research and Development of Natural Products from Li Folk Medicine Institute of Tropical Bioscience and Biotechnology Chinese Academy of Tropical Agricultural Sciences Haikou 571101 P. R. China
| | - Li Liu
- School of Medicine and Pharmacy Key Laboratory of Marine Medicine Chinese Ministry of Education Ocean University of China 5 Yushan Road Qingdao 266003 P. R. China
| | - Qikai Sun
- School of Medicine and Pharmacy Key Laboratory of Marine Medicine Chinese Ministry of Education Ocean University of China 5 Yushan Road Qingdao 266003 P. R. China
| | - Xianyang Wang
- School of Medicine and Pharmacy Key Laboratory of Marine Medicine Chinese Ministry of Education Ocean University of China 5 Yushan Road Qingdao 266003 P. R. China
| | - Peng Wang
- School of Medicine and Pharmacy Key Laboratory of Marine Medicine Chinese Ministry of Education Ocean University of China 5 Yushan Road Qingdao 266003 P. R. China
| | - Zhihua Lv
- School of Medicine and Pharmacy Key Laboratory of Marine Medicine Chinese Ministry of Education Ocean University of China 5 Yushan Road Qingdao 266003 P. R. China
- Laboratory for Marine Drugs and Bioproducts Qingdao National Laboratory for Marine Science and Technology Qingdao 266237 P. R. China
| | - Ming Li
- School of Medicine and Pharmacy Key Laboratory of Marine Medicine Chinese Ministry of Education Ocean University of China 5 Yushan Road Qingdao 266003 P. R. China
- Laboratory for Marine Drugs and Bioproducts Qingdao National Laboratory for Marine Science and Technology Qingdao 266237 P. R. China
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16
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Kuwana D, Nagatomo M, Inoue M. Total Synthesis of 5-epi-Eudesm-4(15)-ene-1β,6β-diol via Decarbonylative Radical Coupling Reaction. Org Lett 2019; 21:7619-7623. [DOI: 10.1021/acs.orglett.9b02895] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Daiki Kuwana
- Graduate School of Pharmaceutical Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Masanori Nagatomo
- Graduate School of Pharmaceutical Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Masayuki Inoue
- Graduate School of Pharmaceutical Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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17
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Kuwana D, Ovadia B, Kamimura D, Nagatomo M, Inoue M. Installation of O‐Heterocycles to N‐Heteroarenes via an Et
3
B/O
2
‐Mediated Radical Reaction of α‐Alkoxy and α‐Alkoxyacyl Tellurides. ASIAN J ORG CHEM 2019. [DOI: 10.1002/ajoc.201900170] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Daiki Kuwana
- Graduate School of Pharmaceutical SciencesThe University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
| | - Benjamin Ovadia
- Graduate School of Pharmaceutical SciencesThe University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
| | - Daigo Kamimura
- Graduate School of Pharmaceutical SciencesThe University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
| | - Masanori Nagatomo
- Graduate School of Pharmaceutical SciencesThe University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
| | - Masayuki Inoue
- Graduate School of Pharmaceutical SciencesThe University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
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18
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József J, Juhász L, Somsák L. Thio-click reaction of 2-deoxy-exo-glycals towards new glycomimetics: stereoselective synthesis of C-2-deoxy-d-glycopyranosyl compounds. NEW J CHEM 2019. [DOI: 10.1039/c8nj06138f] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Photoinitiated addition of thiols to 2-deoxy-exo-glycals obtained from endo-glycals of d-arabino, d-lyxo, d-erythro and d-threo configurations resulted in highly regio- and stereoselective formation of glycosylmethyl sulfide type glycomimetics.
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Affiliation(s)
- János József
- University of Debrecen
- Department of Organic Chemistry
- Hungary
| | - László Juhász
- University of Debrecen
- Department of Organic Chemistry
- Hungary
| | - László Somsák
- University of Debrecen
- Department of Organic Chemistry
- Hungary
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19
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Kawamata T, Yamaguchi A, Nagatomo M, Inoue M. Convergent Total Synthesis of Asimicin via Decarbonylative Radical Dimerization. Chemistry 2018; 24:18907-18912. [DOI: 10.1002/chem.201805317] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Indexed: 12/20/2022]
Affiliation(s)
- Takahiro Kawamata
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; 7-3-1 Hongo Bunkyo-ku Tokyo 113-003 Japan
| | - Akinori Yamaguchi
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; 7-3-1 Hongo Bunkyo-ku Tokyo 113-003 Japan
| | - Masanori Nagatomo
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; 7-3-1 Hongo Bunkyo-ku Tokyo 113-003 Japan
| | - Masayuki Inoue
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; 7-3-1 Hongo Bunkyo-ku Tokyo 113-003 Japan
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20
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Affiliation(s)
- You Yang
- Shanghai
Key Laboratory of New Drug Design, School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Biao Yu
- State
Key Laboratory of Bio-organic and Natural Products Chemistry, Shanghai
Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
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21
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Fujino H, Nagatomo M, Paudel A, Panthee S, Hamamoto H, Sekimizu K, Inoue M. Unified Total Synthesis of Polyoxins J, L, and Fluorinated Analogues on the Basis of Decarbonylative Radical Coupling Reactions. Angew Chem Int Ed Engl 2017; 56:11865-11869. [PMID: 28727238 DOI: 10.1002/anie.201706671] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Indexed: 01/22/2023]
Abstract
Polyoxins J (1 a) and L (1 b) are important nucleoside antibiotics. The complex and densely functionalized dipeptide structures of 1 a and 1 b contain thymine and uracil nucleobases, respectively. Herein we report the unified total synthesis of 1 a, 1 b, and their artificial analogues 1 c and 1 d with trifluorothymine and fluorouracil structures. Decarbonylative radical coupling between α-alkoxyacyl tellurides and a chiral glyoxylic oxime ether led to chemo- and stereoselective construction of the ribonucleoside α-amino acid structures of 1 a-d without damaging the preinstalled nucleobases. The high applicability of the radical-based methodology was further demonstrated by preparation of the trihydroxynorvaline moiety of 1 a-d. The two amino acid fragments were connected and elaborated into 1 a-d (longest linear sequence: 11 steps). Compounds 1 a and 1 b assembled in this way exhibited potent activity against true fungi, while only 1 d was active against Gram-positive bacteria.
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Affiliation(s)
- Haruka Fujino
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Masanori Nagatomo
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Atmika Paudel
- Teikyo University, Institute of Medical Mycology, 359 Otsuka, Hachioji, Tokyo, 192-0395, Japan
| | - Suresh Panthee
- Teikyo University, Institute of Medical Mycology, 359 Otsuka, Hachioji, Tokyo, 192-0395, Japan
| | - Hiroshi Hamamoto
- Teikyo University, Institute of Medical Mycology, 359 Otsuka, Hachioji, Tokyo, 192-0395, Japan
| | - Kazuhisa Sekimizu
- Teikyo University, Institute of Medical Mycology, 359 Otsuka, Hachioji, Tokyo, 192-0395, Japan
| | - Masayuki Inoue
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
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22
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Fujino H, Nagatomo M, Paudel A, Panthee S, Hamamoto H, Sekimizu K, Inoue M. Unified Total Synthesis of Polyoxins J, L, and Fluorinated Analogues on the Basis of Decarbonylative Radical Coupling Reactions. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201706671] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Haruka Fujino
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; Hongo, Bunkyo-ku Tokyo 113-0033 Japan
| | - Masanori Nagatomo
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; Hongo, Bunkyo-ku Tokyo 113-0033 Japan
| | - Atmika Paudel
- Teikyo University; Institute of Medical Mycology; 359 Otsuka, Hachioji Tokyo 192-0395 Japan
| | - Suresh Panthee
- Teikyo University; Institute of Medical Mycology; 359 Otsuka, Hachioji Tokyo 192-0395 Japan
| | - Hiroshi Hamamoto
- Teikyo University; Institute of Medical Mycology; 359 Otsuka, Hachioji Tokyo 192-0395 Japan
| | - Kazuhisa Sekimizu
- Teikyo University; Institute of Medical Mycology; 359 Otsuka, Hachioji Tokyo 192-0395 Japan
| | - Masayuki Inoue
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; Hongo, Bunkyo-ku Tokyo 113-0033 Japan
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23
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Lázár L, Juhász L, Batta G, Borbás A, Somsák L. Unprecedented β-manno type thiodisaccharides with a C-glycosylic function by photoinitiated hydrothiolation of 1-C-substituted glycals. NEW J CHEM 2017. [DOI: 10.1039/c6nj03751h] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Unique thiodisaccharides of β-manno type featuring C-glycosylic structure with an anomeric functional group for further elaboration were obtained by radical-mediated hydrothiolation of 1-C-acceptor-substituted glycals.
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Affiliation(s)
- László Lázár
- Department of Organic Chemistry
- University of Debrecen
- Hungary
| | - László Juhász
- Department of Organic Chemistry
- University of Debrecen
- Hungary
| | - Gyula Batta
- Department of Organic Chemistry
- University of Debrecen
- Hungary
| | - Anikó Borbás
- Department of Pharmaceutical Chemistry
- University of Debrecen
- Hungary
| | - László Somsák
- Department of Organic Chemistry
- University of Debrecen
- Hungary
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24
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Masuda K, Nagatomo M, Inoue M. Direct assembly of multiply oxygenated carbon chains by decarbonylative radical–radical coupling reactions. Nat Chem 2016; 9:207-212. [DOI: 10.1038/nchem.2639] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Accepted: 09/08/2016] [Indexed: 11/09/2022]
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25
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Matsumura S, Matsui Y, Nagatomo M, Inoue M. Stereoselective construction of anti - and syn -1,2-diol structures via decarbonylative radical coupling of α-alkoxyacyl tellurides. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.06.056] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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26
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27
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Nagatomo M, Kamimura D, Matsui Y, Masuda K, Inoue M. Et 3B-mediated two- and three-component coupling reactions via radical decarbonylation of α-alkoxyacyl tellurides: single-step construction of densely oxygenated carboskeletons. Chem Sci 2015; 6:2765-2769. [PMID: 29403632 PMCID: PMC5763990 DOI: 10.1039/c5sc00457h] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2015] [Accepted: 03/05/2015] [Indexed: 11/21/2022] Open
Abstract
The single-step construction of various densely oxygenated carboskeletons was achieved by radical-based two- and three-component coupling reactions of sugar derivatives, without the need for light or heat. Et3B/O2-mediated decarbonylation readily converted α-alkoxyacyl tellurides to α-alkoxy carbon radicals, which intermolecularly added to glyoxylic oxime ether or enones to provide the two-component adducts. Furthermore, the three-component adducts were produced by an intermolecular aldol reaction between the aldehyde and the boron enolates generated by capture of the two-component radical intermediates by Et3B. This powerful coupling method serves as a novel strategy for the convergent synthesis of polyol natural products.
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Affiliation(s)
- Masanori Nagatomo
- Graduate School of Pharmaceutical Sciences , The University of Tokyo , Hongo, Bunkyo-ku , Tokyo 113-0033 , Japan .
| | - Daigo Kamimura
- Graduate School of Pharmaceutical Sciences , The University of Tokyo , Hongo, Bunkyo-ku , Tokyo 113-0033 , Japan .
| | - Yuki Matsui
- Graduate School of Pharmaceutical Sciences , The University of Tokyo , Hongo, Bunkyo-ku , Tokyo 113-0033 , Japan .
| | - Keisuke Masuda
- Graduate School of Pharmaceutical Sciences , The University of Tokyo , Hongo, Bunkyo-ku , Tokyo 113-0033 , Japan .
| | - Masayuki Inoue
- Graduate School of Pharmaceutical Sciences , The University of Tokyo , Hongo, Bunkyo-ku , Tokyo 113-0033 , Japan .
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28
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Kancharla PK, Kato T, Crich D. Probing the influence of protecting groups on the anomeric equilibrium in sialic acid glycosides with the persistent radical effect. J Am Chem Soc 2014; 136:5472-80. [PMID: 24606062 PMCID: PMC4004215 DOI: 10.1021/ja501276r] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2014] [Indexed: 12/11/2022]
Abstract
A method for the investigation of the influence of protecting groups on the anomeric equilibrium in the sialic acid glycosides has been developed on the basis of the equilibration of O-sialyl hydroxylamines by reversible homolytic scission of the glycosidic bond following the dictates of the Fischer-Ingold persistent radical effect. It is found that a trans-fused 4O,5N-oxazolidinone group stabilizes the equatorial glycoside, i.e., reduces the anomeric effect, when compared to the 4O,5N-diacetyl protected systems. This effect is discussed in terms of the powerful electron-withdrawing nature of the oxazolidinone system, which in turn is a function of its strong dipole moment in the mean plane of the pyranose ring system. The new equilibration method displays a small solvent effect and is most pronounced in less polar media consistent with the anomeric effect in general. The unusual (for anomeric radicals) poor kinetic selectivity of anomeric sialyl radicals is discussed in terms of the planar π-type structure of these radicals and of competing 1,3-diaxial interactions in the diastereomeric transition states for trapping on the α- and β-faces of the radical.
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Affiliation(s)
- Pavan K Kancharla
- Department of Chemistry, Wayne State University , 5101 Cass Avenue, Detroit, Michigan 48202, United States
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29
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Highly diastereoselective 1,2-dichlorination of glycals using NCS/PPh3: study of substituent and solvent effects. Tetrahedron 2014. [DOI: 10.1016/j.tet.2013.12.088] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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30
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Alvarez-Dorta D, León EI, Kennedy AR, Martín A, Pérez-Martín I, Riesco-Fagundo C, Suárez E. Photochemistry of α-Diketones in Carbohydrates: Anomalous Norrish Type II Photoelimination and Norrish-Yang Photocyclization Promoted by the Internal Carbonyl Group. Chemistry 2014; 20:2663-71. [DOI: 10.1002/chem.201303843] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2013] [Indexed: 11/08/2022]
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31
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Bruyère I, Tóth Z, Benyahia H, Xue JL, Praly JP. NaBH3CN and other systems as substitutes of tin and silicon hydrides in the light or heat-initiated reduction of halosugars: a tunable access to either 2-deoxy sugars or 1,5-anhydro-itols. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.09.032] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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32
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Lázár L, Csávás M, Hadházi Á, Herczeg M, Tóth M, László Somsák, Barna T, Herczegh P, Borbás A. Systematic study on free radical hydrothiolation of unsaturated monosaccharide derivatives with exo- and endocyclic double bonds. Org Biomol Chem 2013; 11:5339-50. [DOI: 10.1039/c3ob40547h] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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33
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Guyenne S, León EI, Martín A, Pérez-Martín I, Suárez E. Intramolecular 1,8-Hydrogen Atom Transfer Reactions in Disaccharide Systems Containing Furanose Units. J Org Chem 2012; 77:7371-91. [DOI: 10.1021/jo301153u] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Sabrina Guyenne
- Instituto de Productos Naturales y Agrobiología del CSIC, Carretera de La Esperanza 3, 38206 La Laguna,
Tenerife, Spain
| | - Elisa I. León
- Instituto de Productos Naturales y Agrobiología del CSIC, Carretera de La Esperanza 3, 38206 La Laguna,
Tenerife, Spain
| | - Angeles Martín
- Instituto de Productos Naturales y Agrobiología del CSIC, Carretera de La Esperanza 3, 38206 La Laguna,
Tenerife, Spain
| | - Inés Pérez-Martín
- Instituto de Productos Naturales y Agrobiología del CSIC, Carretera de La Esperanza 3, 38206 La Laguna,
Tenerife, Spain
| | - Ernesto Suárez
- Instituto de Productos Naturales y Agrobiología del CSIC, Carretera de La Esperanza 3, 38206 La Laguna,
Tenerife, Spain
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34
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Jackowski O, Chrétien F, Didierjean C, Chapleur Y. Formation of septanoses from hexopyranosides via 5,6-exo-glycals. Carbohydr Res 2012; 356:93-103. [DOI: 10.1016/j.carres.2012.02.026] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2011] [Revised: 02/20/2012] [Accepted: 02/25/2012] [Indexed: 01/07/2023]
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35
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León EI, Martín Á, Pérez-Martín I, Quintanal LM, Suárez E. C-C Bond Formation by Sequential Intramolecular Hydrogen Atom Transfer/Intermolecular Radical Allylation Reaction in Carbohydrate Systems. European J Org Chem 2012. [DOI: 10.1002/ejoc.201200300] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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36
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Damljanović I, Stevanović D, Vukićević M, Vukićević RD. Electrochemical bromochlorination of peracetylated glycals. Carbohydr Res 2011; 346:2683-7. [DOI: 10.1016/j.carres.2011.09.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2011] [Revised: 09/12/2011] [Accepted: 09/19/2011] [Indexed: 11/26/2022]
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37
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Abla M, Durand G, Pucci B. Propyl-Ended Hemifluorinated Surfactants: Synthesis and Self-Assembling Properties. J Org Chem 2011; 76:2084-93. [DOI: 10.1021/jo102245c] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Maher Abla
- Université d′Avignon et des Pays de Vaucluse, Faculté des Sciences, Equipe Chimie Bioorganique et Systèmes Amphiphiles, 33 rue Louis Pasteur, F-84000 Avignon, France
| | - Grégory Durand
- Université d′Avignon et des Pays de Vaucluse, Faculté des Sciences, Equipe Chimie Bioorganique et Systèmes Amphiphiles, 33 rue Louis Pasteur, F-84000 Avignon, France
- Institut des Biomolécules Max Mousseron, UMR 5247, CNRS-Universités Montpellier I & II, 15 avenue Charles Flahault, F-34093 Montpellier Cedex 05, France
| | - Bernard Pucci
- Université d′Avignon et des Pays de Vaucluse, Faculté des Sciences, Equipe Chimie Bioorganique et Systèmes Amphiphiles, 33 rue Louis Pasteur, F-84000 Avignon, France
- Institut des Biomolécules Max Mousseron, UMR 5247, CNRS-Universités Montpellier I & II, 15 avenue Charles Flahault, F-34093 Montpellier Cedex 05, France
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38
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Choumane M, Banchet A, Probst N, Gérard S, Plé K, Haudrechy A. The synthesis of d-C-mannopyranosides. CR CHIM 2011. [DOI: 10.1016/j.crci.2010.05.015] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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39
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Manabe S, Aihara Y, Ito Y. Radical C-glycosylation reaction of pyranosides with the 2,3-trans carbamate group. Chem Commun (Camb) 2011; 47:9720-2. [DOI: 10.1039/c1cc13172a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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40
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León EI, Martín A, Peréz-Martín I, Quintanal LM, Suárez E. Hydrogen Atom Transfer Experiments Provide Chemical Evidence for the Conformational Differences between C- and O-Disaccharides. European J Org Chem 2010. [DOI: 10.1002/ejoc.201000470] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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41
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Doboszewski B. D-Arabinose-based synthesis of homo-C-d4T and homo-C-thymidine. NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2010; 28:875-901. [PMID: 20183559 DOI: 10.1080/15257770903306518] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
2,3,5-Tri-O-benzyl-D-arabinofuranosyl halides (chloride, bromide) were reacted with AllMgBr, MeMgBr, and VinMgBr to furnish anomeric mixtures of the C-glycosyl products. The factors that influenced the beta/alpha ratio are discussed. The alpha,beta-C-vinyl derivative was transformed into 1-deoxy-1-C-hydroxymethyl-beta- and -alpha-D-arabinofuranoses (2,5-anhydro-D-glucitol and -mannitol, respectively), separable after isopropylidenation step. 2,5-Anhydro-1,3-O-isopropylidene-D-glucitol was converted into 2,5-anhydro-6-O-triphenylmethyl-D-erythro-hex-3,4-enitol and 2,5-anhydro-4,6-di-O-benzoyl-3-deoxy-D-ribo-hexitol, which were coupled with N-3-benzoylthymine under the Mitsunobu conditions to furnish two analogs of nucleosides with a -CH(2)- insert between sugar moieties and thymine.
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Affiliation(s)
- Bogdan Doboszewski
- Departmento de Química, Universidade Federal Rural de Pernambuco, Recife, Pernambuco, Brazil.
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42
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Synthesis of anomeric sulfonamides and their behaviour under radical-mediated bromination conditions. Carbohydr Res 2009; 344:269-77. [DOI: 10.1016/j.carres.2008.11.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2008] [Revised: 11/05/2008] [Accepted: 11/05/2008] [Indexed: 11/19/2022]
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43
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Linker T, Schanzenbach D, Elamparuthi E, Sommermann T, Fudickar W, Gyóllai V, Somsák L, Demuth W, Schmittel M. Remarkable Oxidation Stability of Glycals: Excellent Substrates for Cerium(IV)-Mediated Radical Reactions. J Am Chem Soc 2008; 130:16003-10. [DOI: 10.1021/ja8052706] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Torsten Linker
- Department of Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, D-14476 Potsdam, Germany, Department of Organic Chemistry, University of Debrecen, P.O. Box 20, H-4010 Debrecen, Hungary, and Department of Chemistry, University of Siegen, Adolf Reichwein Strasse 2, D-57068 Siegen, Germany
| | - Dirk Schanzenbach
- Department of Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, D-14476 Potsdam, Germany, Department of Organic Chemistry, University of Debrecen, P.O. Box 20, H-4010 Debrecen, Hungary, and Department of Chemistry, University of Siegen, Adolf Reichwein Strasse 2, D-57068 Siegen, Germany
| | - Elangovan Elamparuthi
- Department of Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, D-14476 Potsdam, Germany, Department of Organic Chemistry, University of Debrecen, P.O. Box 20, H-4010 Debrecen, Hungary, and Department of Chemistry, University of Siegen, Adolf Reichwein Strasse 2, D-57068 Siegen, Germany
| | - Thomas Sommermann
- Department of Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, D-14476 Potsdam, Germany, Department of Organic Chemistry, University of Debrecen, P.O. Box 20, H-4010 Debrecen, Hungary, and Department of Chemistry, University of Siegen, Adolf Reichwein Strasse 2, D-57068 Siegen, Germany
| | - Werner Fudickar
- Department of Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, D-14476 Potsdam, Germany, Department of Organic Chemistry, University of Debrecen, P.O. Box 20, H-4010 Debrecen, Hungary, and Department of Chemistry, University of Siegen, Adolf Reichwein Strasse 2, D-57068 Siegen, Germany
| | - Viktor Gyóllai
- Department of Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, D-14476 Potsdam, Germany, Department of Organic Chemistry, University of Debrecen, P.O. Box 20, H-4010 Debrecen, Hungary, and Department of Chemistry, University of Siegen, Adolf Reichwein Strasse 2, D-57068 Siegen, Germany
| | - László Somsák
- Department of Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, D-14476 Potsdam, Germany, Department of Organic Chemistry, University of Debrecen, P.O. Box 20, H-4010 Debrecen, Hungary, and Department of Chemistry, University of Siegen, Adolf Reichwein Strasse 2, D-57068 Siegen, Germany
| | - Wolfgang Demuth
- Department of Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, D-14476 Potsdam, Germany, Department of Organic Chemistry, University of Debrecen, P.O. Box 20, H-4010 Debrecen, Hungary, and Department of Chemistry, University of Siegen, Adolf Reichwein Strasse 2, D-57068 Siegen, Germany
| | - Michael Schmittel
- Department of Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, D-14476 Potsdam, Germany, Department of Organic Chemistry, University of Debrecen, P.O. Box 20, H-4010 Debrecen, Hungary, and Department of Chemistry, University of Siegen, Adolf Reichwein Strasse 2, D-57068 Siegen, Germany
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Martín Á, Pérez-Martín I, Quintanal LM, Suárez E. Intramolecular 1,8-Hydrogen Atom Transfer. Stereoselectivity of the Hexopyranos-5′-yl Radical Reactions in Hexp-(1→4)-Hexp Disaccharide Systems. J Org Chem 2008; 73:7710-20. [DOI: 10.1021/jo801499d] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ángeles Martín
- Instituto de Productos Naturales y Agrobiología del C.S.I.C., Carretera de La Esperanza 3, 38206 La Laguna, Tenerife, Spain
| | - Inés Pérez-Martín
- Instituto de Productos Naturales y Agrobiología del C.S.I.C., Carretera de La Esperanza 3, 38206 La Laguna, Tenerife, Spain
| | - Luís M. Quintanal
- Instituto de Productos Naturales y Agrobiología del C.S.I.C., Carretera de La Esperanza 3, 38206 La Laguna, Tenerife, Spain
| | - Ernesto Suárez
- Instituto de Productos Naturales y Agrobiología del C.S.I.C., Carretera de La Esperanza 3, 38206 La Laguna, Tenerife, Spain
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Čolović M, Vukićević M, Šegan D, Manojlović D, Sojic N, Somsák L, Vukićević R. Electrochemical Bromination of Peracetylated Glycals. Adv Synth Catal 2008. [DOI: 10.1002/adsc.200700310] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Chromium(II)-complex mediated formation of C-glycosides from glycosyl halides under aqueous biphasic conditions. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.08.019] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Yan L, Liu F, Yang J, Liu H. Synthesis of Novel Caged Intramolecular Ketals of β‐C‐Glycopyranosidic Ketones. J Carbohydr Chem 2007. [DOI: 10.1080/07328300701609111] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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He L, Zhi Zhang Y, Tanoh M, Chen GR, Praly JP, Chrysina ED, Tiraidis C, Kosmopoulou M, Leonidas DD, Oikonomakos NG. In the Search of Glycogen Phosphorylase Inhibitors: Synthesis of C-D-Glycopyranosylbenzo(hydro)quinones – Inhibition of and Binding to Glycogen Phosphorylase in the Crystal. European J Org Chem 2007. [DOI: 10.1002/ejoc.200600548] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Micskei K, Juhász Z, Ratković ZR, Somsák L. Reactivity of per-O-acetylated 1-thioglycosides and glycosyl sulfones towards chromium(II) complexes in aqueous medium. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2006.06.075] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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