51
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Kobayashi Y, Nakatsuji Y, Li S, Tsuzuki S, Takemoto Y. Direct N
-Glycofunctionalization of Amides with Glycosyl Trichloroacetimidate by Thiourea/Halogen Bond Donor Co-Catalysis. Angew Chem Int Ed Engl 2018; 57:3646-3650. [DOI: 10.1002/anie.201712726] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2017] [Revised: 01/16/2018] [Indexed: 12/23/2022]
Affiliation(s)
- Yusuke Kobayashi
- Graduate School of Pharmaceutical Sciences; Kyoto University; Yoshida Sakyo-ku Kyoto 606-8501 Japan
| | - Yuya Nakatsuji
- Graduate School of Pharmaceutical Sciences; Kyoto University; Yoshida Sakyo-ku Kyoto 606-8501 Japan
| | - Shanji Li
- Graduate School of Pharmaceutical Sciences; Kyoto University; Yoshida Sakyo-ku Kyoto 606-8501 Japan
| | - Seiji Tsuzuki
- Research Initiative of Computational Sciences (RICS); Nanosystem Research Institute (NRI); National Institute of Advanced Industrial Science and Technology (AIST); 1-1-1 Umezono Tsukuba Ibaraki 305-8568 Japan
| | - Yoshiji Takemoto
- Graduate School of Pharmaceutical Sciences; Kyoto University; Yoshida Sakyo-ku Kyoto 606-8501 Japan
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52
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Kobayashi Y, Nakatsuji Y, Li S, Tsuzuki S, Takemoto Y. Direct N
-Glycofunctionalization of Amides with Glycosyl Trichloroacetimidate by Thiourea/Halogen Bond Donor Co-Catalysis. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201712726] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Yusuke Kobayashi
- Graduate School of Pharmaceutical Sciences; Kyoto University; Yoshida Sakyo-ku Kyoto 606-8501 Japan
| | - Yuya Nakatsuji
- Graduate School of Pharmaceutical Sciences; Kyoto University; Yoshida Sakyo-ku Kyoto 606-8501 Japan
| | - Shanji Li
- Graduate School of Pharmaceutical Sciences; Kyoto University; Yoshida Sakyo-ku Kyoto 606-8501 Japan
| | - Seiji Tsuzuki
- Research Initiative of Computational Sciences (RICS); Nanosystem Research Institute (NRI); National Institute of Advanced Industrial Science and Technology (AIST); 1-1-1 Umezono Tsukuba Ibaraki 305-8568 Japan
| | - Yoshiji Takemoto
- Graduate School of Pharmaceutical Sciences; Kyoto University; Yoshida Sakyo-ku Kyoto 606-8501 Japan
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53
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Pal R, Das A, Jayaraman N. Radical halogenation-mediated latent–active glycosylations of allyl glycosides. Chem Commun (Camb) 2018; 54:588-590. [DOI: 10.1039/c7cc07332a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Radical halogenation-mediated glycosylation using allyl glycosides as donors and as acceptors emerges to be an efficient and hither-to unknown glycosylation method, adhering to the concept of the latent–active methodology.
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Affiliation(s)
- Rita Pal
- Department of Organic Chemistry
- Indian Institute of Science
- Bangalore 560012
- India
| | - Anupama Das
- Department of Organic Chemistry
- Indian Institute of Science
- Bangalore 560012
- India
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54
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Li W, Yu B. Gold-catalyzed glycosylation in the synthesis of complex carbohydrate-containing natural products. Chem Soc Rev 2018; 47:7954-7984. [DOI: 10.1039/c8cs00209f] [Citation(s) in RCA: 61] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Gold(i)- and gold(iii)-catalyzed glycosylation reactions and their application in the synthesis of natural glycoconjugates are reviewed.
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Affiliation(s)
- Wei Li
- State Key Laboratory of Bioorganic and Natural Products Chemistry
- Center for Excellence in Molecular Synthesis
- Shanghai Institute of Organic Chemistry
- University of Chinese Academy of Sciences
- Chinese Academy of Sciences
| | - Biao Yu
- State Key Laboratory of Bioorganic and Natural Products Chemistry
- Center for Excellence in Molecular Synthesis
- Shanghai Institute of Organic Chemistry
- University of Chinese Academy of Sciences
- Chinese Academy of Sciences
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55
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Huang N, Liao H, Yao H, Xie T, Zhang S, Zou K, Liu XW. Diastereoselective Synthesis of C-Vinyl Glycosides via Gold(I)-Catalyzed Tandem 1,3-Acyloxy Migration/Ferrier Rearrangement. Org Lett 2017; 20:16-19. [DOI: 10.1021/acs.orglett.7b03062] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nianyu Huang
- Hubei
Key Laboratory of Natural Products Research and Development, College
of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang 443002, P. R. China
| | - Hongze Liao
- Division
of Chemistry and Biological Chemistry, School of Physical and Mathematical
Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
| | - Hui Yao
- Division
of Chemistry and Biological Chemistry, School of Physical and Mathematical
Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
| | - Tianpeng Xie
- Hubei
Key Laboratory of Natural Products Research and Development, College
of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang 443002, P. R. China
| | - Shasha Zhang
- Division
of Chemistry and Biological Chemistry, School of Physical and Mathematical
Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
| | - Kun Zou
- Hubei
Key Laboratory of Natural Products Research and Development, College
of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang 443002, P. R. China
| | - Xue-Wei Liu
- Division
of Chemistry and Biological Chemistry, School of Physical and Mathematical
Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
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56
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Shaw M, Kumar Y, Thakur R, Kumar A. Electron-deficient pyridinium salts/thiourea cooperative catalyzed O-glycosylation via activation of O-glycosyl trichloroacetimidate donors. Beilstein J Org Chem 2017; 13:2385-2395. [PMID: 29181119 PMCID: PMC5687052 DOI: 10.3762/bjoc.13.236] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2017] [Accepted: 10/04/2017] [Indexed: 12/05/2022] Open
Abstract
The glycosylation of O-glycosyl trichloroacetimidate donors using a synergistic catalytic system of electron-deficient pyridinium salts/aryl thiourea derivatives at room temperature is demonstrated. The acidity of the adduct formed by the 1,2-addition of alcohol to the electron-deficient pyridinium salt is increased in the presence of an aryl thiourea derivative as an hydrogen-bonding cocatalyst. This transformation occurs under mild reaction conditions with a wide range of O-glycosyl trichloroacetimidate donors and glycosyl acceptors to afford the corresponding O-glycosides in moderate to good yields with predictable selectivity. In addition, the optimized method is also utilized for the regioselective O-glycosylation by using a partially protected acceptor.
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Affiliation(s)
- Mukta Shaw
- Department of Chemistry, Indian Institute of Technology Patna, Bihta 801106, Bihar, India
| | - Yogesh Kumar
- Department of Chemistry, Indian Institute of Technology Patna, Bihta 801106, Bihar, India
| | - Rima Thakur
- Department of Chemistry, National Institute of Technology Patna, Patna 800005, Bihar, India
| | - Amit Kumar
- Department of Chemistry, Indian Institute of Technology Patna, Bihta 801106, Bihar, India
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57
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Takahashi D, Tanaka M, Nishi N, Toshima K. Novel 1,2-cis-stereoselective glycosylations utilizing organoboron reagents and their application to natural products and complex oligosaccharide synthesis. Carbohydr Res 2017; 452:64-77. [PMID: 29080430 DOI: 10.1016/j.carres.2017.10.004] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Revised: 10/05/2017] [Accepted: 10/10/2017] [Indexed: 11/27/2022]
Abstract
In this mini-review article, 1,2-cis-stereoselective glycosylation methods utilizing organoboron reagents and 1,2-anhydroglycosyl donors that were developed in our laboratory, including regio- and 1,2-cis-stereoselective glycosylations using glycosyl-acceptor-derived boronic ester catalysts and 1,2-cis-stereoselective glycosylations using glycosyl-acceptor-derived borinic ester catalysts, are recounted. Representative applications of these methods to the synthesis of biologically active natural products and a complex oligosaccharide are also described.
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Affiliation(s)
- Daisuke Takahashi
- 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
| | - Nobuya Nishi
- 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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58
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Affiliation(s)
| | - Jiatong Guo
- Department of Chemistry, University of Florida, Gainesville, Florida, USA
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59
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Palo-Nieto C, Sau A, Galan MC. Gold(I)-Catalyzed Direct Stereoselective Synthesis of Deoxyglycosides from Glycals. J Am Chem Soc 2017; 139:14041-14044. [PMID: 28934850 PMCID: PMC5951607 DOI: 10.1021/jacs.7b08898] [Citation(s) in RCA: 71] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
![]()
Au(I) in combination
with AgOTf enables the unprecedented direct
and α-stereoselective catalytic synthesis of deoxyglycosides
from glycals. Mechanistic investigations suggest that the reaction
proceeds via Au(I)-catalyzed hydrofunctionalization of the enol ether
glycoside. The room temperature reaction is high yielding and amenable
to a wide range of glycal donors and OH nucleophiles.
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Affiliation(s)
- Carlos Palo-Nieto
- School of Chemistry, University of Bristol , Cantock's Close, Bristol BS8 1TS, United Kingdom
| | - Abhijit Sau
- School of Chemistry, University of Bristol , Cantock's Close, Bristol BS8 1TS, United Kingdom
| | - M Carmen Galan
- School of Chemistry, University of Bristol , Cantock's Close, Bristol BS8 1TS, United Kingdom
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60
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Podvalnyy NM, Malysheva NN, Panova MV, Zinin AI, Chizhov AO, Orlova AV, Kononov LO. Stereoselective sialylation with O-trifluoroacetylated thiosialosides: hydrogen bonding involved? Carbohydr Res 2017; 451:12-28. [PMID: 28934626 DOI: 10.1016/j.carres.2017.09.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2017] [Revised: 09/05/2017] [Accepted: 09/05/2017] [Indexed: 01/05/2023]
Abstract
A series of novel sialyl donors containing O-trifluoroacetyl (TFA) groups at various positions was synthesized. The choice of protecting groups in sialyl donors was based on hypothesis that variations in ability of different acyl groups to act as hydrogen bond acceptors would influence the supramolecular structure of reaction mixture (solution structure), hence the outcome of sialylation. These glycosyl donors were examined in the model glycosylation of the primary hydroxyl group of 1,2:3,4-di-O-isopropylidene-α-D-galactopyranose in comparison with sialyl donors without O-TFA groups. The presence of O-TFA groups in a sialyl donor strongly affected the outcome of sialylation. Several sialyl donors studied showed promising results: yields of disaccharides can be as high as 86% as can be the stereoselectivities (α/β up to 15:1). The results obtained suggest that varying acyl O-protecting groups in sialyl donor may result in dramatic changes in the outcome of sialylation although further studies are required to dissect the influence of intermolecular hydrogen bonding and intramolecular substituent effects related to variations of electron-withdrawing properties of different acyl groups.
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Affiliation(s)
- Nikita M Podvalnyy
- N. D. Zelinsky Institute of Organic Chemistry of the Russian Academy of Sciences, Leninsky prosp., 47, 119991 Moscow, Russian Federation
| | - Nelly N Malysheva
- N. D. Zelinsky Institute of Organic Chemistry of the Russian Academy of Sciences, Leninsky prosp., 47, 119991 Moscow, Russian Federation
| | - Maria V Panova
- N. D. Zelinsky Institute of Organic Chemistry of the Russian Academy of Sciences, Leninsky prosp., 47, 119991 Moscow, Russian Federation
| | - Alexander I Zinin
- N. D. Zelinsky Institute of Organic Chemistry of the Russian Academy of Sciences, Leninsky prosp., 47, 119991 Moscow, Russian Federation
| | - Alexander O Chizhov
- N. D. Zelinsky Institute of Organic Chemistry of the Russian Academy of Sciences, Leninsky prosp., 47, 119991 Moscow, Russian Federation
| | - Anna V Orlova
- N. D. Zelinsky Institute of Organic Chemistry of the Russian Academy of Sciences, Leninsky prosp., 47, 119991 Moscow, Russian Federation
| | - Leonid O Kononov
- N. D. Zelinsky Institute of Organic Chemistry of the Russian Academy of Sciences, Leninsky prosp., 47, 119991 Moscow, Russian Federation.
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61
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Abstract
Great attention has been given to metal-organic frameworks (MOFs)-derived solid bases because of their attractive structure and catalytic performance in various organic reactions. The extraordinary skeleton structure of MOFs provides many possibilities for incorporation of diverse basic functionalities, which is unachievable for conventional solid bases. The past decade has witnessed remarkable advances in this vibrant research area; however, MOFs for heterogeneous basic catalysis have never been reviewed until now. Therefore, a review summarizing MOFs-derived base catalysts is highly expected. In this review, we present an overview of the recent progress in MOFs-derived solid bases covering preparation, characterization, and catalytic applications. In the preparation section, the solid bases are divided into two categories, namely, MOFs with intrinsic basicity and MOFs with modified basicity. The basicity can originate from either metal sites or organic ligands. Different approaches used for generation of basic sites are included, and each approach is described with representative examples. The fundamental principles for the design and fabrication of MOFs with basic functionalities are featured. In the characterization section, experimental techniques and theoretical calculations employed for characterization of basic MOFs are summarized. Some representive experimental techniques, such as temperature-programmed desorption of CO2 (CO2-TPD) and infrared (IR) spectra of different probing molecules, are covered. Following preparation and characterization, the catalytic applications of MOFs-derived solid bases are dealt with. These solid bases have potential to catalyze some well-known "base-catalyzed reactions" like Knoevenagel condensation, aldol condensation, and Michael addition. Meanwhile, in contrast to conventional solid bases, MOFs show some different catalytic properties due to their special structural and surface properties. Remarkably, characteristic features of MOFs-derived solid bases are described by comparing with conventional inorganic counterparts, keeping in mind the current opportunities and challenges in this field.
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Affiliation(s)
- Li Zhu
- State Key Laboratory of Materials-Oriented Chemical Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), College of Chemistry and Chemical Engineering, Nanjing Tech University , Nanjing 210009, China
| | - Xiao-Qin Liu
- State Key Laboratory of Materials-Oriented Chemical Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), College of Chemistry and Chemical Engineering, Nanjing Tech University , Nanjing 210009, China
| | - Hai-Long Jiang
- Department of Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China , Hefei, Anhui 230026, China
| | - Lin-Bing Sun
- State Key Laboratory of Materials-Oriented Chemical Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), College of Chemistry and Chemical Engineering, Nanjing Tech University , Nanjing 210009, China
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62
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Abstract
Pd(MeCN)2Cl2 enables the α-stereoselective catalytic synthesis of 2,3-unsaturated O-glycosides from O(3)-acylated glycals without the requirement for additives to preactivate either donor or nucleophile. Mechanistic studies suggest that, unlike traditional (η3-allyl)palladium-mediated processes, the reaction proceeds via an alkoxy-palladium intermediate that increases the proton acidity and oxygen nucleophilicity of the alcohol. The method is exemplified with the synthesis of a range of glycosides and glycoconjugates of synthetic utility.
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Affiliation(s)
- Abhijit Sau
- School of Chemistry, University of Bristol , Cantock's Close, Bristol, BS8 1TS, United Kingdom
| | - M Carmen Galan
- School of Chemistry, University of Bristol , Cantock's Close, Bristol, BS8 1TS, United Kingdom
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63
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Peng P, Schmidt RR. Acid-Base Catalysis in Glycosidations: A Nature Derived Alternative to the Generally Employed Methodology. Acc Chem Res 2017; 50:1171-1183. [PMID: 28440624 DOI: 10.1021/acs.accounts.6b00518] [Citation(s) in RCA: 83] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Inverting glycosyltransferases enforce in the active site an intramolecular, acid-base catalyzed glycosidation that, due to proximity of the donor anomeric carbon and the acceptor hydroxyl group, follows an SN2-type reaction. Spacers, tethering donor and acceptor via nonreacting functional groups, led in intramolecular glycosidations to excellent yields and, independent of the donor anomeric configuration, to either the α- or the β-anomer. The requirement of a demanding protecting group pattern confines the application of this efficient method. Only the method where the 2-hydroxyl group of a mannopyranosyl donor is tethered via an acetal spacer to the reacting acceptor functional group is used for β-mannopyranoside synthesis. The most elegant method, tethering donor and acceptor covalently to the spacer via the leaving group and the reacting functional group, was so far not as efficient as hoped. This method is very efficient when donor and acceptor are temporarily assembled through a hydrogen-bond facilitating a stretched hexagon-like transition state. This follows from the stereoselective O-glucopyranosyl trichloroacetimidate transformation into O-glucopyranosyl phosphate with dibenzyl phosphoric acid as acceptor that can be regarded as A═B-C-H acceptor type. Generalizing this concept to the use of alcohols as acceptors requires reversible generation of an A-B-C-H adduct where A-H represents the acceptor (RO-H) and B═C a catalyst that has to fulfill several criteria. Among these criteria are low affinity to nitrogen, avoiding glycosyl donor activation in the absence of acceptor, and high affinity to oxygen in order to generate the A-B-C-H adduct with increased proton acidity. Thus, hydrogen-bond mediated self-assembly of donor and acceptor and concomitant donor activation via a transition state is available, which enforces an acid-base catalyzed SN2-type reaction. It could be shown that PhBF2, Ph2BF, and PhSiF3 are such catalysts that fulfill the desired four functions: reversible adduct formation with the acceptor, hydrogen-bond mediated tethering of this adduct with the donor, and acid- and base-catalysis of the glycosidation. Also Lewis acidic metal salts, particularly the dimeric gold(III) chloride, turned out to exhibit excellent B═C type catalyst properties. Worth mentioning in this context is the ability of gold(III) chloride to regioselectively activate diols. As thioureas have high affinity to anions and also to neutral compounds through strong hydrogen bonds, their binding to alcohols and concomitant activation of O-glycosyl trichloroacetimidates was of interest. Yet, even the acidic N,N'-bis[3,5-bis(trifluoromethyl)phenyl]-thiourea was unable to catalyze glycosidations. However, as a cocatalyst to acids, thiourea exerts a strong effect that, based on NMR studies, leads first to a hydrogen-bond mediated catalyst-cocatalyst-acceptor complex. This complex activates the donor in an intramolecular, acid-base catalyzed reaction that is again closely related to the action of inverting glycosyltransferases. Thus, from O-(α-glycosyl) trichloroacetimidates, good yields of the inversion products, that is, the β-glycosides, are obtained. This novel conceptual approach to glycosidation revealed that for retention of configuration in addition a catalytic nucleophile is required that enables formation of the α-glucoside from the α-trichloroacetimidate. Preliminary studies with a catalyst possessing this 5-fold function, that is, adduct formation with the acceptor, hydrogen-bonding between the reactants, acid and base catalysis, and a catalytic nucleophile as part of a chiral framework supporting facial selection, exhibited good chances for final success in this endeavor.
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Affiliation(s)
- Peng Peng
- National Glycoengineering
Research Center, Shandong Provincial Key Laboratory of Carbohydrate
Chemistry and Glycobiology, Shandong University, Wenhua West Road 44#, Jinan, Shandong 250012, China
| | - Richard R. Schmidt
- Department of Chemistry, University of Konstanz, Fach 725, D-78457 Konstanz, Germany
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64
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Sau A, Williams R, Palo‐Nieto C, Franconetti A, Medina S, Galan MC. Palladium-Catalyzed Direct Stereoselective Synthesis of Deoxyglycosides from Glycals. Angew Chem Int Ed Engl 2017; 56:3640-3644. [PMID: 28211228 PMCID: PMC5484376 DOI: 10.1002/anie.201612071] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Revised: 01/26/2017] [Indexed: 02/06/2023]
Abstract
Palladium(II) in combination with a monodentate phosphine ligand enables the unprecedented direct and α-stereoselective catalytic synthesis of deoxyglycosides from glycals. Initial mechanistic studies suggest that in the presence of N-phenyl-2-(di-tert-butylphosphino)pyrrole as the ligand, the reaction proceeds via an alkoxy palladium intermediate that increases the proton acidity and oxygen nucleophilicity of the alcohol. The method is demonstrated with a wide range of glycal donors and acceptors, including substrates bearing alkene functionalities.
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Affiliation(s)
- Abhijit Sau
- School of ChemistryUniversity of BristolCantock's CloseBristolBS8 1TSUK
| | - Ryan Williams
- School of ChemistryUniversity of BristolCantock's CloseBristolBS8 1TSUK
| | - Carlos Palo‐Nieto
- School of ChemistryUniversity of BristolCantock's CloseBristolBS8 1TSUK
| | | | - Sandra Medina
- School of ChemistryUniversity of BristolCantock's CloseBristolBS8 1TSUK
| | - M. Carmen Galan
- School of ChemistryUniversity of BristolCantock's CloseBristolBS8 1TSUK
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65
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Sau A, Williams R, Palo‐Nieto C, Franconetti A, Medina S, Galan MC. Palladium‐Catalyzed Direct Stereoselective Synthesis of Deoxyglycosides from Glycals. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201612071] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Abhijit Sau
- School of Chemistry University of Bristol Cantock's Close Bristol BS8 1TS UK
| | - Ryan Williams
- School of Chemistry University of Bristol Cantock's Close Bristol BS8 1TS UK
| | - Carlos Palo‐Nieto
- School of Chemistry University of Bristol Cantock's Close Bristol BS8 1TS UK
| | - Antonio Franconetti
- School of Chemistry University of Bristol Cantock's Close Bristol BS8 1TS UK
| | - Sandra Medina
- School of Chemistry University of Bristol Cantock's Close Bristol BS8 1TS UK
| | - M. Carmen Galan
- School of Chemistry University of Bristol Cantock's Close Bristol BS8 1TS UK
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66
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Park Y, Harper KC, Kuhl N, Kwan EE, Liu RY, Jacobsen EN. Macrocyclic bis-thioureas catalyze stereospecific glycosylation reactions. Science 2017; 355:162-166. [PMID: 28082586 PMCID: PMC5671764 DOI: 10.1126/science.aal1875] [Citation(s) in RCA: 187] [Impact Index Per Article: 26.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Accepted: 12/06/2016] [Indexed: 01/10/2023]
Abstract
Carbohydrates are involved in nearly all aspects of biochemistry, but their complex chemical structures present long-standing practical challenges to their synthesis. In particular, stereochemical outcomes in glycosylation reactions are highly dependent on the steric and electronic properties of coupling partners; thus, carbohydrate synthesis is not easily predictable. Here we report the discovery of a macrocyclic bis-thiourea derivative that catalyzes stereospecific invertive substitution pathways of glycosyl chlorides. The utility of the catalyst is demonstrated in the synthesis of trans-1,2-, cis-1,2-, and 2-deoxy-β-glycosides. Mechanistic studies are consistent with a cooperative mechanism in which an electrophile and a nucleophile are simultaneously activated to effect a stereospecific substitution reaction.
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Affiliation(s)
- Yongho Park
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA
| | - Kaid C Harper
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA
| | - Nadine Kuhl
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA
| | - Eugene E Kwan
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA
| | - Richard Y Liu
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA
| | - Eric N Jacobsen
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA.
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67
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Abstract
Glycosylation using Tf2NH or Tf2NTMS as the catalysts and a trichloroacetimidate donor gives glycosides with inverted anomeric stereochemistry.
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Affiliation(s)
- K. Kowalska
- Department of Chemistry
- University of Copenhagen
- Universitetsparken 5
- DK-2100 Copenhagen
- Denmark
| | - C. M. Pedersen
- Department of Chemistry
- University of Copenhagen
- Universitetsparken 5
- DK-2100 Copenhagen
- Denmark
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68
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Hashimoto Y, Tanikawa S, Saito R, Sasaki K. β-Stereoselective Mannosylation Using 2,6-Lactones. J Am Chem Soc 2016; 138:14840-14843. [DOI: 10.1021/jacs.6b08874] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Yusuke Hashimoto
- Department of Chemistry, Toho University, 2-2-1 Miyama, Funabashi 274-8510 Japan
| | - Saki Tanikawa
- Department of Chemistry, Toho University, 2-2-1 Miyama, Funabashi 274-8510 Japan
| | - Ryota Saito
- Department of Chemistry, Toho University, 2-2-1 Miyama, Funabashi 274-8510 Japan
| | - Kaname Sasaki
- Department of Chemistry, Toho University, 2-2-1 Miyama, Funabashi 274-8510 Japan
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69
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Sletten ET, Ramadugu SK, Nguyen HM. Utilization of bench-stable and readily available nickel(II) triflate for access to 1,2-cis-2-aminoglycosides. Carbohydr Res 2016; 435:195-207. [PMID: 27816838 DOI: 10.1016/j.carres.2016.10.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2016] [Revised: 10/10/2016] [Accepted: 10/20/2016] [Indexed: 10/20/2022]
Abstract
The utilization of substoichiometric amounts of commercially available nickel(II) triflate as an activator in the reagent-controlled glycosylation reaction for the stereoselective construction of biologically relevant targets containing 1,2-cis-2-amino glycosidic linkages is reported. This straightforward and accessible methodology is mild, operationally simple and safe through catalytic activation by readily available Ni(OTf)2 in comparison to systems employing our previously in-house prepared Ni(4-F-PhCN)4(OTf)2. We anticipate that the bench-stable and inexpensive Ni(OTf)2, coupled with little to no extra laboratory training to set up the glycosylation reaction and no requirement of specialized equipment, should make this methodology be readily adopted by non-carbohydrate specialists. This report further highlights the efficacy of Ni(OTf)2 to prepare several bioactive motifs, such as blood type A-type V and VI antigens, heparin sulfate disaccharide repeating unit, aminooxy glycosides, and α-GalNAc-Serine conjugate, which cannot be achieved in high yield and α-selectivity utilizing in-house prepared Ni(4-F-PhCN)4(OTf)2 catalyst. The newly-developed protocol eliminates the need for the synthesis of Ni(4-F-PhCN)4(OTf)2 and is scalable and reproducible. Furthermore, computational simulations in combination with 1H NMR studies analyzed the effects of various solvents on the intramolecular hydrogen bonding network of tumor-associated mucin Fmoc-protected GalNAc-threonine amino acid antigen derivative, verifying discrepancies found that were previously unreported.
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Affiliation(s)
- Eric T Sletten
- Department of Chemistry, University of Iowa, Iowa City, 52242, USA
| | | | - Hien M Nguyen
- Department of Chemistry, University of Iowa, Iowa City, 52242, USA.
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70
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Li X, Zhu J. Glycosylation via Transition-Metal Catalysis: Challenges and Opportunities. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600484] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Xiaohua Li
- Department of Natural Sciences; University of Michigan-Dearborn; 4901 Evergreen Road 48128 Dearborn Michigan USA
| | - Jianglong Zhu
- Department of Chemistry and Biochemistry and School of Green Chemistry and Engineering; The University of Toledo; 2801 West Bancroft Street 43606 Toledo Ohio USA
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71
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Abstract
The development of glycobiology relies on the sources of particular oligosaccharides in their purest forms. As the isolation of the oligosaccharide structures from natural sources is not a reliable option for providing samples with homogeneity, chemical means become pertinent. The growing demand for diverse oligosaccharide structures has prompted the advancement of chemical strategies to stitch sugar molecules with precise stereo- and regioselectivity through the formation of glycosidic bonds. This Review will focus on the key developments towards chemical O-glycosylations in the current century. Synthesis of novel glycosyl donors and acceptors and their unique activation for successful glycosylation are discussed. This Review concludes with a summary of recent developments and comments on future prospects.
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Affiliation(s)
- Rituparna Das
- Department of Chemical SciencesIndian Institute of Science Education and Research (IISER) KolkataMohanpurNadia741246India
| | - Balaram Mukhopadhyay
- Department of Chemical SciencesIndian Institute of Science Education and Research (IISER) KolkataMohanpurNadia741246India
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72
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D’Angelo KA, Taylor MS. Borinic Acid Catalyzed Stereo- and Regioselective Couplings of Glycosyl Methanesulfonates. J Am Chem Soc 2016; 138:11058-66. [DOI: 10.1021/jacs.6b06943] [Citation(s) in RCA: 91] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Kyan A. D’Angelo
- 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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73
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Abstract
A robust platform for facile defined glycan synthesis does not exist. Yet the need for such technology has never been greater as researchers seek to understand the full scope of carbohydrate function, stretching beyond the classical roles of structure and energy storage to encompass highly nuanced cell signaling events. To comprehensively explore and exploit the full diversity of carbohydrate functions, we must first be able to synthesize them in a controlled manner. Toward this goal, traditional chemical syntheses are inefficient while nature's own synthetic enzymes, the glycosyl transferases, can be challenging to express and expensive to employ on scale. Glycoside hydrolases represent a pool of glycan processing enzymes that can be either used in a transglycosylation mode or, better, engineered to function as "glycosynthases," mutant enzymes capable of assembling glycosides. Glycosynthases grant access to valuable glycans that act as functional and structural probes or indeed as inhibitors and therapeutics in their own right. The remodelling of glycosylation patterns in therapeutic proteins via glycoside hydrolases and their mutants is an exciting frontier in both basic research and industrial scale processes.
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Affiliation(s)
- Phillip M. Danby
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia, Canada
| | - Stephen G. Withers
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia, Canada
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74
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Vibhute AM, Dhaka A, Athiyarath V, Sureshan KM. A versatile glycosylation strategy via Au(iii) catalyzed activation of thioglycoside donors. Chem Sci 2016; 7:4259-4263. [PMID: 30090287 PMCID: PMC6054025 DOI: 10.1039/c6sc00633g] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Accepted: 03/04/2016] [Indexed: 12/15/2022] Open
Abstract
Among various methods of chemical glycosylations, glycosylation by activation of thioglycoside donors using a thiophilic promoter is an important strategy. Many promoters have been developed for the activation of thioglycosides. However, incompatibility with substrates having alkenes and the requirement of a stoichiometric amount of promoters, co-promoters and extreme temperatures are some of the limitations. We have developed an efficient methodology for glycosylation via the activation of thioglycoside donors using a catalytic amount of AuCl3 and without any co-promoter. The reaction is very fast, high-yielding and very facile at room temperature. The versatility of this method is evident from the facile glycosylation with both armed and disarmed donors and sterically demanding substrates (acceptors/donors) at ambient conditions, from the stability of the common protecting groups, and from the compatibility of alkene-containing substrates during the reaction.
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Affiliation(s)
- Amol M Vibhute
- School of Chemistry , Indian Institute of Science Education and Research , Thiruvananthapuram , KERALA-695016 , India . ; http://kms514.wix.com/kmsgroup
| | - Arun Dhaka
- School of Chemistry , Indian Institute of Science Education and Research , Thiruvananthapuram , KERALA-695016 , India . ; http://kms514.wix.com/kmsgroup
| | - Vignesh Athiyarath
- School of Chemistry , Indian Institute of Science Education and Research , Thiruvananthapuram , KERALA-695016 , India . ; http://kms514.wix.com/kmsgroup
| | - Kana M Sureshan
- School of Chemistry , Indian Institute of Science Education and Research , Thiruvananthapuram , KERALA-695016 , India . ; http://kms514.wix.com/kmsgroup
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75
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Peng P, Linseis M, Winter RF, Schmidt RR. Regioselective Acylation of Diols and Triols: The Cyanide Effect. J Am Chem Soc 2016; 138:6002-9. [PMID: 27104625 DOI: 10.1021/jacs.6b02454] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Central topics of carbohydrate chemistry embrace structural modifications of carbohydrates and oligosaccharide synthesis. Both require regioselectively protected building blocks that are mainly available via indirect multistep procedures. Hence, direct protection methods targeting a specific hydroxy group are demanded. Dual hydrogen bonding will eventually differentiate between differently positioned hydroxy groups. As cyanide is capable of various kinds of hydrogen bonding and as it is a quite strong sterically nondemanding base, regioselective O-acylations should be possible at low temperatures even at sterically congested positions, thus permitting formation and also isolation of the kinetic product. Indeed, 1,2-cis-diols, having an equatorial and an axial hydroxy group, benzoyl cyanide or acetyl cyanide as an acylating agent, and DMAP as a catalyst yield at -78 °C the thermodynamically unfavorable axial O-acylation product; acyl migration is not observed under these conditions. This phenomenon was substantiated with 3,4-O-unproteced galacto- and fucopyranosides and 2,3-O-unprotected mannopyranosides. Even for 3,4,6-O-unprotected galactopyranosides as triols, axial 4-O-acylation is appreciably faster than O-acylation of the primary 6-hydroxy group. The importance of hydrogen bonding for this unusual regioselectivity could be confirmed by NMR studies and DFT calculations, which indicate favorable hydrogen bonding of cyanide to the most acidic axial hydroxy group supported by hydrogen bonding of the equatorial hydroxy group to the axial oxygen. Thus, the "cyanide effect" is due to dual hydrogen bonding of the axial hydroxy group which enhances the nucleophilicity of the respective oxygen atom, permitting an even faster reaction for diols than for mono-ols. In contrast, fluoride as a counterion favors dual hydrogen bonding to both hydroxy groups leading to equatorial O-acylation.
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Affiliation(s)
- Peng Peng
- Department of Chemistry, University of Konstanz , D-78457 Konstanz, Germany
| | - Michael Linseis
- Department of Chemistry, University of Konstanz , D-78457 Konstanz, Germany
| | - Rainer F Winter
- Department of Chemistry, University of Konstanz , D-78457 Konstanz, Germany
| | - Richard R Schmidt
- Department of Chemistry, University of Konstanz , D-78457 Konstanz, Germany
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76
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Mukherjee MM, Basu N, Ghosh R. Iron(iii) chloride modulated selective 1,2-trans glycosylation based on glycosyl trichloroacetimidate donors and its application in orthogonal glycosylation. RSC Adv 2016. [DOI: 10.1039/c6ra21859h] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
FeCl3 modulated excellent 1,2-trans selective glycosylations based on trichloroacetimidate glycosyl donors even in the presence of apparently silent C-2 protecting group, along with orthogonal glycosylation reactions are reported.
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Affiliation(s)
| | - Nabamita Basu
- Department of Chemistry
- Jadavpur University
- Kolkata 700032
- India
| | - Rina Ghosh
- Department of Chemistry
- Jadavpur University
- Kolkata 700032
- India
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77
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Qiao Y, Ge W, Jia L, Hou X, Wang Y, Pedersen CM. Glycosylation intermediates studied using low temperature1H- and19F-DOSY NMR: new insight into the activation of trichloroacetimidates. Chem Commun (Camb) 2016; 52:11418-11421. [DOI: 10.1039/c6cc05272j] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Low temperature1H- and19F-DOSY have been used for analyzing reactive intermediates in glycosylation reactions, where a glycosyl trichloroacetimidate donor has been activated using different catalysts.
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Affiliation(s)
- Yan Qiao
- Analytical Instrumentation Center & State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan 030001
- People's Republic of China
| | - Wenzhi Ge
- Analytical Instrumentation Center & State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan 030001
- People's Republic of China
| | - Lingyu Jia
- Shanxi Engineering Research Center of Biorefinery
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan 030001
- People's Republic of China
| | - Xianglin Hou
- Shanxi Engineering Research Center of Biorefinery
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan 030001
- People's Republic of China
| | - Yingxiong Wang
- Shanxi Engineering Research Center of Biorefinery
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan 030001
- People's Republic of China
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