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Siry SA, Timoshenko VM, Rusanov EB, Schermolovich YG. Synthesis and oxidative transformations of 2-functionalized 2-trifluoromethyltetrahydrothiophenes. J Fluor Chem 2022. [DOI: 10.1016/j.jfluchem.2022.109999] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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2
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Liu H, Li X. A Stereoselective Ring-Closing Glycosylation via Nonglycosylating Pathway. J Org Chem 2014; 79:5834-41. [DOI: 10.1021/jo5006763] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Han Liu
- Department
of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, PR China
| | - Xuechen Li
- Department
of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, PR China
- State
Key Laboratory of Synthetic Chemistry, University of Hong Kong, Hong Kong, PR China
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3
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Shi Z, Sun L, Li C. Solvent Polarity-Controlled Selective Synthesis of Methyl Pyranoside and Furanoside. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2014; 62:3287-3292. [PMID: 24646173 DOI: 10.1021/jf500144b] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A selective synthesis of methyl d-glucopyranoside or furanoside has been developed using 2,4,6-trichloro-1,3,5-triazine (TCT)-activated DMSO and d-glucose in methanol. At higher concentrations of DMSO, only pyranoside was formed and at lower concentrations of DMSO, only furanoside was formed. This method was also successfully applied to other sugars. In terms of reaction rates, selectivities, and yields, this method is better than most of the currently used methods.
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Affiliation(s)
- Zhizhong Shi
- Department of Chemistry, School of Science, Tianjin University , Tianjin 300072, People's Republic of China
| | - Lili Sun
- Department of Chemistry, School of Science, Tianjin University , Tianjin 300072, People's Republic of China
| | - Chunbao Li
- Department of Chemistry, School of Science, Tianjin University , Tianjin 300072, People's Republic of China
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4
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Baldoni L, Marino C. Synthetic tools for the characterization of galactofuranosyl transferases: glycosylations via acylated glycosyl iodides. Carbohydr Res 2013; 374:75-81. [PMID: 23643834 DOI: 10.1016/j.carres.2013.03.032] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2012] [Revised: 03/26/2013] [Accepted: 03/28/2013] [Indexed: 02/04/2023]
Abstract
With the aim of developing synthetic tools for the characterization of galactofuranosyltransferases, the synthesis of 9-decenyl glycosides of D-Manp, D-Galf, and β-D-Galf-(1→3)-D-Manp was targeted. The interest in the alkenyl aglycone arises via potential conjugation reactions, once the terminal double bond has been conveniently functionalized. The glycosylation of β-D-Galf-(1→3)-D-Manp was attempted by two different approaches: the trichloroacetimidate method and the glycosylation via the glycosyl iodide. The conditions for the latter were established on the basis of glycosylation assays of per-O-acetylmannose. On the other hand, the study of glycosylation reactions via per-O-benzoylated galactofuranosyl iodide confirms the versatility of glycosyl iodides as donors.
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Affiliation(s)
- Luciana Baldoni
- CIHIDECAR-CONICET, Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires 1428, Argentina
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5
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Zhu SY, Yang JS. Synthesis of tetra- and hexasaccharide fragments corresponding to the O-antigenic polysaccharide of Klebsiella pneumoniae. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.03.074] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Abstract
Seven-atom ring sugars, called septanoses, are increasingly the focus of scientific inquiries because of their potential biological activities. This article details the synthesis, conformational analysis, and protein-binding properties of septanose carbohydrates. A distinction is drawn between septanoses that are substituted in the 6-position of the ring and those that are not. When a C-6 substituent is absent, the structure is essentially that of an aldohexose in its septanose, rather than furanose or pyranose, ring form; they may play as-of-yet unexplored roles in glycobiology. Septanoses having a hydroxymethyl group at C-6, on the other hand, are ring-expanded analogues of pyranoses. Syntheses have moved beyond the preparation of seven-membered ring monosaccharides to the development of septanosyl donors. These donors have been used in the synthesis of novel di- and trisaccharides that contain septanoses as well as a variety of glycoconjugates. Low-energy conformations adopted by septanoses have been organized based on ring substitution and stereochemistry. Instances where septanoses have been demonstrated to bind to natural proteins are presented and analyzed. The major conclusion drawn in the chapter is that advances in the synthesis of septanose carbohydrates now enable a detailed investigation of their activity in a number of biological contexts.
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7
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Santra S, Jonas E, Bourgault JP, El-Baba T, Andreana PR. Kinetic Products Under Thermal Conditions: Rapid Entry into α/β-D-Galactofuranosides Using Microwave Irradiation and Selective Lewis Acids. J Carbohydr Chem 2011. [DOI: 10.1080/07328303.2011.585259] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Soumava Santra
- a Department of Chemistry , Wayne State University , Detroit, Michigan, 48202, USA
| | - Emily Jonas
- a Department of Chemistry , Wayne State University , Detroit, Michigan, 48202, USA
| | - Jean-Paul Bourgault
- a Department of Chemistry , Wayne State University , Detroit, Michigan, 48202, USA
| | - Tarick El-Baba
- a Department of Chemistry , Wayne State University , Detroit, Michigan, 48202, USA
| | - Peter R. Andreana
- a Department of Chemistry , Wayne State University , Detroit, Michigan, 48202, USA
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8
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Bromodimethylsulfonium bromide (BDMS) mediated dithioacetalization of carbohydrates under solvent-free conditions. Carbohydr Res 2010; 345:2139-45. [DOI: 10.1016/j.carres.2010.07.044] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2010] [Revised: 07/26/2010] [Accepted: 07/29/2010] [Indexed: 11/23/2022]
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9
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Bordoni A, de Lederkremer RM, Marino C. Synthesis of 5-deoxy-β-d-galactofuranosides as tools for the characterization of β-d-galactofuranosidases. Bioorg Med Chem 2010; 18:5339-45. [DOI: 10.1016/j.bmc.2010.05.038] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2010] [Revised: 05/13/2010] [Accepted: 05/14/2010] [Indexed: 10/19/2022]
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10
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Richards MR, Lowary TL. Chemistry and biology of galactofuranose-containing polysaccharides. Chembiochem 2009; 10:1920-38. [PMID: 19591187 DOI: 10.1002/cbic.200900208] [Citation(s) in RCA: 170] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The thermodynamically less stable form of galactose-galactofuranose (Galf)-is essential for the viability of several pathogenic species of bacteria and protozoa but absent in this form in mammals, so the biochemical pathways by which Galf-containing glycans are assembled and catabolysed are attractive sites for drug action. This potential has led to increasing interest in the synthesis of molecules containing Galf residues, their subsequent use in studies directed towards understanding the enzymes that process these residues and the identification of potential inhibitors of these pathways. Major achievements of the past several years have included an in-depth understanding of the mechanism of UDP-galactopyranose mutase (UGM), the enzyme that produces UDP-Galf, which is the donor species for galactofuranosyltransferases. A number of methods for the synthesis of galactofuranosides have also been developed, and practitioners in the field now have many options for the initiation of a synthesis of glycoconjugates containing either alpha- or beta-Galf residues. UDP-Galf has also been prepared by a number of approaches, and it appears that a chemoenzymatic approach is currently the most viable method for producing multi-milligram amounts of this important intermediate. Recent advances both in the understanding of the mechanism of UGM and in the synthesis of galactofuranose and its derivatives are highlighted in this review.
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Affiliation(s)
- Michele R Richards
- Alberta Ingenuity Centre for Carbohydrate Science and Department of Chemistry, University of Alberta, Gunning-Lemieux Chemistry Centre, Edmonton, AB T6G 2G2 (Canada)
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11
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Baldoni L, Marino C. Facile Synthesis of per-O-tert-Butyldimethylsilyl-β-d-galactofuranose and Efficient Glycosylation via the Galactofuranosyl Iodide. J Org Chem 2009; 74:1994-2003. [DOI: 10.1021/jo8025274] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Luciana Baldoni
- CIHIDECAR-CONICET, Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II, Ciudad Universitaria, 1428 Buenos Aires, Argentina
| | - Carla Marino
- CIHIDECAR-CONICET, Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II, Ciudad Universitaria, 1428 Buenos Aires, Argentina
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12
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Cirillo L, Bedini E, Parrilli M. Acetolysis of 6-Deoxysugar Disaccharide Building Blocks:exoversusendoActivation. European J Org Chem 2008. [DOI: 10.1002/ejoc.200800696] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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13
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Completo GC, Lowary TL. Synthesis of Galactofuranose-Containing Acceptor Substrates for Mycobacterial Galactofuranosyltransferases. J Org Chem 2008; 73:4513-25. [DOI: 10.1021/jo800457j] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Gladys C. Completo
- Alberta Ingenuity Centre for Carbohydrate Science and Department of Chemistry, The University of Alberta, Gunning-Lemieux Chemistry Centre, Edmonton, Alberta, T6G 2G2 Canada
| | - Todd L. Lowary
- Alberta Ingenuity Centre for Carbohydrate Science and Department of Chemistry, The University of Alberta, Gunning-Lemieux Chemistry Centre, Edmonton, Alberta, T6G 2G2 Canada
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14
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Vojtech M, Petrušová M, Pribulová B, Petruš L. Direct conversion of 1-deoxy-1-nitroalditols to methyl glycofuranosides. Tetrahedron Lett 2008. [DOI: 10.1016/j.tetlet.2008.03.044] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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15
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16
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Euzen R, Ferrières V, Plusquellec D. Synthesis of galactofuranose-containing disaccharides using thioimidoyl-type donors. Carbohydr Res 2006; 341:2759-68. [PMID: 17056021 DOI: 10.1016/j.carres.2006.10.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2006] [Revised: 09/28/2006] [Accepted: 10/02/2006] [Indexed: 10/24/2022]
Abstract
Four galactofuranose-containing disaccharides have been prepared utilising various thioimidates [Galf-SC(NR)XR'] and suitably protected acceptors as key precursors. We observed that the efficiency of the coupling reactions was particularly dependent on the aglycon present on the furanosyl donor when copper(II) ions were used as the promoter, and that activation could be correlated with the nature of the third heteroatom, X.
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Affiliation(s)
- Ronan Euzen
- Ecole Nationale Supérieure de Chimie de Rennes, UMR CNRS 6226, Avenue du Général Leclerc, F-35700 Rennes, France
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17
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Bai Y, Lowary TL. 2,3-Anhydrosugars in Glycoside Bond Synthesis. Application to α-d-Galactofuranosides. J Org Chem 2006; 71:9658-71. [PMID: 17168583 DOI: 10.1021/jo061713o] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report here the use of 2,3-anhydro-D-gulofuranosyl thioglycosides and glycosyl sulfoxides in the synthesis of alpha-D-galactofuranosidic bonds, which are present in a range of bacterial and fungal glycoconjugates. This two-step method involves a stereoselective glycosylation in which a 2,3-anhydro-alpha-D-gulofuranoside is obtained either as the sole or as the major product, followed by a regioselective opening of the epoxide ring using lithium benzylate in the presence of (-)-sparteine. In exploring the scope of the method, donors protected at O5 and O6 with an isopropylidene acetal, benzyl ethers, or benzoate esters were studied. Overall, the glycosyl sulfoxides provided the products in slightly higher yields and selectivity, with the best results being obtained with benzylated and benzoylated substrates. In the epoxide ring-opening reactions, the acetal- and ether-protected donors afforded poor to modest regioselectivity, whereas the benzoylated products gave good yields of the desired alpha-D-galactofuranosides. The benzoyl-protected species are, therefore, the donors of choice for these reactions. The utility of the approach was demonstrated through the synthesis of three alpha-D-galactofuranosyl-containing oligosaccharides.
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Affiliation(s)
- Yu Bai
- Alberta Ingenuity Centre for Carbohydrate Science and Department of Chemistry, The University of Alberta, Gunning-Lemieux Chemistry Centre, Edmonton, Alberta T6G 2G2, Canada
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18
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Madhusudan SK, Misra AK. Facile exchange of glycosyl S,S-acetals to their O,O-acetals and preparation of glycofuranosides from acyclic glycosyl S,S-acetals under metal-free reaction conditions in the presence of 1,3-dibromo-5,5-dimethylhydantoin. Carbohydr Res 2005; 340:497-502. [PMID: 15680606 DOI: 10.1016/j.carres.2004.12.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2004] [Accepted: 12/04/2004] [Indexed: 11/19/2022]
Abstract
Exchange of acyclic glycosyl dithioacetals to their O,O-acetals has been achieved by a generalized reaction protocol mediated by 1,3-dibromo-5,5-dimethylhydantoin under mild, metal-free and neutral conditions. This methodology has been extended to the synthesis of alkyl glycofuranosides.
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Affiliation(s)
- Soni Kamlesh Madhusudan
- Medicinal Chemistry Division, Central Drug Research Institute, Chattar Manzil Palace, Lucknow 226 001, UP, India
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19
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Madhusudanan KP, Kumar B, Tiwari P, Madhusudan SK, Misra AK. Effect of metal cationization on the tandem mass spectra of glycosyl dithioacetals. JOURNAL OF MASS SPECTROMETRY : JMS 2005; 40:25-35. [PMID: 15584006 DOI: 10.1002/jms.767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The effect of metal cationization on the tandem mass spectra of glycosyl dithioacetals of glucose, mannose, galactose, rhamnose, arabinose and xylose was studied by electrospray ionization mass spectrometry under ammonium and metal (Li, Na, Ag and Cu) ion cationization conditions. The ammonium-cationized glycosyl dithioacetals fragment by loss of ammonia followed by either two molecules of EtSH or one molecule of EtSH and one molecule of H2O. Lithium cationization leads to additional eliminations such as EtSEt and EtSSEt and C-C cleavages. Elimination of EtSH is not observed under sodium cationization. Silver cationization, on the other hand, leads to additional fragmentations involving the elimination of silver as AgOH and AgSEt. Copper cationization results in adducts where copper has undergone a change of oxidation state from II to I. Li+, Ag+ and Cu+ cationization seem to favour cyclization resulting in elimination of EtSH. However, the mechanisms seem to be differently affected by different metal ions. Li+ and Ag+ cationization appear to be non-specific and favour cyclization involving C2-, C4- and C5-hydroxyl hydrogens, whereas Cu+ cationization seems to favour cyclization involving C4-hydroxyl hydrogen.
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Affiliation(s)
- K P Madhusudanan
- Sophisticated Analytical Instrument Facility, Central Drug Research Institute, Lucknow-226 001, India.
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20
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Madhusudanan KP, Kumar B, Tiwari P, Madhusudan SK, Misra AK. Tandem mass spectra of transition-metal ion adducts of glycosyl dithioacetals; distinction among stereoisomers. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2005; 19:470-476. [PMID: 15655791 DOI: 10.1002/rcm.1811] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Electrospray ionization mass spectra of some glycosyl dithioacetals recorded in the presence of transition-metal chlorides, XCl2 (where X = Co, Mn and Zn), give abundant adduct ions such as [M+XCl]+ and [2M-H+X]+ and minor ions such as [M-H+X]+ and [2M+XCl]+. The tandem mass spectra of these adducts show characteristic elimination of neutral molecules such as H2O, HCl, EtSH, CH2O, C2H4O2/C2H4O. [M+XCl]+ ions fragment readily and the fragmentation appears to be stereochemically controlled as the relative abundances of the fragments are different for three stereoisomers. The added metal is lost as neutral molecules in the form of XCl(OH) and XCl(SEt). This is a predominant pathway in the ZnCl+ adducts. [2M+XCl]+ ions fragment preferentially by elimination of HCl, indicating strong metal interactions in the resulting dimeric [2M-H+X]+ ion. As there are several electron-rich centers in the molecule, the dimeric complex [2M-H+X]+ can have several structures and the observed fragmentations may reflect the sum of those of all these structures. The dimeric complexes fragment by elimination of neutral molecules leaving the dimeric interactions intact. The extent of fragmentation varies for the stereoisomers, leading to stereochemical differentiation.
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Affiliation(s)
- K P Madhusudanan
- Sophisticated Analytical Instrument Facility, Central Drug Research Institute, Lucknow-226 001, India.
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22
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Gurjar MK, Talukdar A. Synthesis of terminal disaccharide unit of Klebsiella pneumoniae ssp. R20. Tetrahedron 2004. [DOI: 10.1016/j.tet.2004.02.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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23
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A new synthesis of key intermediates for the assembly of polycyclic ethers: Yb(OTf)3-promoted formation of O,S-acetals from α-fluorosulfides and alcohols. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.01.077] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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24
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Kobayashi S, Alizadeh BH, Sasaki SY, Oguri H, Hirama M. Synthesis of the Fully Functionalized ABCDE Ring Moiety of Ciguatoxin. Org Lett 2004; 6:751-4. [PMID: 14986966 DOI: 10.1021/ol0364475] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A fully functionalized ABCDE ring moiety of ciguatoxin (CTX), the major causative agent of ciguatera poisoning, was synthesized for the first time. The present strategy involves the efficient installation of the C5-dihydroxybutenyl substituent and construction of the tetrahydrooxepin E ring using a novel alpha-chlorosulfide synthon. [structure: see text]
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Affiliation(s)
- Shoji Kobayashi
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
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25
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Gandolfi-Donadío L, Gallo-Rodriguez C, de Lederkremer RM. Syntheses of beta-d-Galf-(1-->6)-beta-d-Galf-(1-->5)-d-Galf and beta-d-Galf-(1-->5)-beta-d-Galf-(1-->6)-d-Galf, trisaccharide units in the galactan of Mycobacterium tuberculosis. J Org Chem 2003; 68:6928-34. [PMID: 12946132 DOI: 10.1021/jo034365o] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The galactofuran is a crucial constituent of the cell wall of mycobacteria. An efficient synthesis of the two trisaccharide units of the galactan is described. The strategy relies on the use of substituted d-galactono-1,4-lactones as precursors for the internal and the reducing galactofuranoses. Dec-9-enyl beta-d-Galf-(1-->6)-beta-d-Galf-(1-->5)-beta-d-Galf (2) and dec-9-enyl beta-d-Galf-(1-->5)-beta-d-Galf-(1-->6)-beta-d-Galf (9) so far reported as convenient substrates for the galactofuranosyl transferase, and possibly useful for immunological studies, were obtained by the trichloroacetimidate method of glycosylation.
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Affiliation(s)
- Lucía Gandolfi-Donadío
- CIHIDECAR, Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, 1428 Buenos Aires, Argentina
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26
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Inoue M, Wang J, Wang GX, Ogasawara Y, Hirama M. Divergent synthesis of the tetracyclic ethers of 6-X-7-6 ring systems. Tetrahedron 2003. [DOI: 10.1016/s0040-4020(03)00913-x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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27
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Rani S, Agarwal A, Vankar YD. LaCl3·7H2O/NaI/benzyl alcohol: a novel reagent system for regioselective hydration of glycals: application in the synthesis of 1,6-dideoxynojirimycin. Tetrahedron Lett 2003. [DOI: 10.1016/s0040-4039(03)01175-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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28
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Inoue M, Wang GX, Wang J, Hirama M. Novel assembly of cyclic ethers by coupling alpha-chlorosulfides and alcohols. Org Lett 2002; 4:3439-42. [PMID: 12323038 DOI: 10.1021/ol026529d] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A novel protocol for assembling polycyclic ethers was developed and successfully applied to the synthesis of the EFGH ring system of ciguatoxin CTX3C. A key transformation involves construction of an O,S-acetal through coupling of alpha-chlorosulfide and a secondary alcohol under mild conditions. The method is highly applicable to use with sensitive substrates and will enable the synthesis of various natural and artificial polycyclic ethers. [reaction: see text]
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Affiliation(s)
- Masayuki Inoue
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
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29
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30
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Guindon Y, Gagnon M, Thumin I, Chapdelaine D, Jung G, Guérin B. Synthesis of N-glycosides. An alternative approach based on diastereoselective base coupling and S(N)2 cyclization. Org Lett 2002; 4:241-4. [PMID: 11796060 DOI: 10.1021/ol016991i] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text] Acyclic diastereoselection is achieved for the formation of thioaminyl acetals. The highly intramolecular stereocontrolled S(N)2 displacement of the thioaminyls allows for the formation of cyclic nucleoside derivatives. This versatile approach may provide easy access to a large variety of N-glycosides.
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Affiliation(s)
- Yvan Guindon
- Institut de recherches cliniques de Montréal (IRCM), Bio-organic Chemistry Laboratory, 110 avenue des Pins Ouest, Montréal, Québec, Canada H2W 1R7.
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31
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Gurjar MK, Reddy LK, Hotha S. Synthesis of oligosaccharides of motifs D and E of arabinogalactan present in Mycobacterium tuberculosis. J Org Chem 2001; 66:4657-60. [PMID: 11421788 DOI: 10.1021/jo010180a] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Syntheses of the ethyl glycosides of 5-O-(beta-D-galactofuranosyl)-beta-D-galactofuranose and 5-O-(alpha-D-arabinofuranosyl)-6-O-(beta-D-galactofuranosyl)-beta-D-galactofuranose present in motifs D and E of Mycobacterium tuberculosis arabinogalactan, respectively, have been presented. The pentenyl-mediated O-glycosylation reaction was utilized to obtain the disaccharide of motif D. The first coupling reaction to prepare the inner disaccharide portion of motif E was accomplished by trichloroacetamidate method while the installation of the terminal sugar by pentenyl glycosylation approach was successful.
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Affiliation(s)
- M K Gurjar
- National Chemical Laboratory, Pune 411 008, India.
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Gurjar MK, Reddy LK, Hotha S. Synthesis of ethyl 5-O-(alpha-D-arabinofuranosyl)-6-O-(beta-D-galactofuranosyl)-beta-D- galactofuranoside present in motif E of the Mycobacterium tuberculosis cell wall. Org Lett 2001; 3:321-3. [PMID: 11428004 DOI: 10.1021/ol0002976] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[figure: see text] The stereocontrolled synthesis of the trisaccharide ethyl 5-O-(alpha-D-arabinofuranosyl)-6-O-(beta-D-galactofuranosyl)- beta-D-galactofuranoside present in motif E of the Mycobacterium tuberculosis cell wall is described.
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Affiliation(s)
- M K Gurjar
- National Chemical Laboratory, Pune 411 008, India.
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Randell KD, Johnston BD, Brown PN, Pinto BM. Synthesis of galactofuranosyl-containing oligosaccharides corresponding to the glycosylinositolphospholipid of Trypanosoma cruzi. Carbohydr Res 2000; 325:253-64. [PMID: 10839119 DOI: 10.1016/s0008-6215(00)00007-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
The oligosaccharide beta-D-Galf-(1-->3)-alpha-D-Manp-(1-->2)-[beta-D-Galf- (1-->3)]-alpha-D-Manp-(1-->2)-alpha-D-Manp corresponds to the terminal end of the glycosylinositolphospholipid oligosaccharide of the protozoan Trypanosoma cruzi, the causative agent of Chagas' disease. Syntheses of methyl or ethylthio glycosides of the terminal disaccharide, trisaccharide, tetrasaccharide, and pentasaccharide corresponding to this structure are described. These syntheses employ the selective activation of a phenyl 1-selenogalactofuranoside or a phenyl 1-selenomannopyranoside donor over ethyl 1-thioglycoside acceptors with NIS-TfOH.
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Affiliation(s)
- K D Randell
- Department of Chemistry and Biochemistry, Simon Fraser University, Burnaby, B.C., Canada
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Gelin M, Ferrières V, Plusquellec D. A General and Diastereoselective Synthesis of 1,2-cis-Hexofuranosides from 1,2-trans-Thiofuranosyl Donors. European J Org Chem 2000. [DOI: 10.1002/(sici)1099-0690(200004)2000:8<1423::aid-ejoc1423>3.0.co;2-9] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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35
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Takahashi T, Tsukamoto H, Yamada H. Syntheses of GM4 and GM3 Intermediates via Alkylation and Subsequent Intramolecular Glycosidation of 2-Alkoxy-2-phenylthioacetate. Org Lett 1999. [DOI: 10.1021/ol990245k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Takashi Takahashi
- Department of Chemical Engineering, Tokyo Institute of Technology, Meguro, Tokyo 152-8552, Japan
| | - Hirokazu Tsukamoto
- Department of Chemical Engineering, Tokyo Institute of Technology, Meguro, Tokyo 152-8552, Japan
| | - Haruo Yamada
- Department of Chemical Engineering, Tokyo Institute of Technology, Meguro, Tokyo 152-8552, Japan
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36
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Pathak AK, Besra GS, Crick D, Maddry JA, Morehouse CB, Suling WJ, Reynolds RC. Studies on beta-D-Gal(f)-(1-->4)-alpha-L-Rha(p) octyl analogues as substrates for mycobacterial galactosyl transferase activity. Bioorg Med Chem 1999; 7:2407-13. [PMID: 10632050 DOI: 10.1016/s0968-0896(99)00199-6] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The biochemically unique structures of sugar residues in the outer cell wall of Mycobacterium tuberculosis (MTB) make the pathways for their biosynthesis and utilization attractive targets for the development of new and selective anti-tubercular agents. A cell-free assay system for galactosyltransferase activity using UDP[14C]Gal as the glycosyl donor, as well as an in vitro colorimetric broth micro-dilution assay system, were used to determine the activities of three beta-D-gal(f)(1-->4)-alpha-L-rham(p) octyl disaccharides as substrates and antimycobacterial agents respectively. The cell-free enzymatic studies using compounds 8 and 10 suggested that these disaccharides bind to and are effective substrates for a putative mycobacterial galactosyltransferase. The modified acceptor 8 was found to be a slower but prolonged binder as compared to the less substituted analogue 10 as evidenced by their Km and Vmax values. Moderate antimycobacterial activity was observed with compounds 8 and 9 against MTB H37Ra and three clinical isolates of Mycobacterium avium complex (MAC).
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Affiliation(s)
- A K Pathak
- Department of Organic Chemistry, Southern Research Institute, Birmingham, AL 35255, USA
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37
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D'Souza FW, Cheshev PE, Ayers JD, Lowary TL. Conversion of Pyranose Glycals to Furanose Derivatives: A New Route to Oligofuranosides. J Org Chem 1998. [DOI: 10.1021/jo9815406] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Francis W. D'Souza
- Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210
| | - Pavel E. Cheshev
- Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210
| | - Joseph D. Ayers
- Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210
| | - Todd L. Lowary
- Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210
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38
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Marino C, Chiocconi A, Varela O, de Lederkremer RM. The glycosyl-aldonolactone approach for the synthesis of beta-D-Galf-(1-->3)-D-Manp and 3-deoxy-beta-D-xylo-hexofuranosyl-(1-->3)-D-Manp. Carbohydr Res 1998; 311:183-9. [PMID: 9825521 DOI: 10.1016/s0008-6215(98)00214-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
A convenient synthesis of free beta-D-Galf-(1-->3)-D-Manp (8a) is reported. The disaccharide is present as external unit in the lipopeptidophosphoglycan (LPPG) of Trypanosoma cruzi and internally in the lipophosphoglycan (LPG) of Leishmania. Condensation of 2,5,6-tri-O-benzoyl-D-mannono-1,4-lactone (1) with 1,2,3,5,6-penta-O-benzoyl-D-galactofuranose, promoted by SnCl4, led to the beta-glycosyl-lactone, a key intermediate for disaccharide 8a, readily obtained by successive reduction of the lactone with diisoamylborane and debenzoylation. As in the LPG of Leishmania the HO-3 group of the galactofuranose is glycosylated by alpha-D-Galp, we also synthesized 3-deoxy-beta-D-xylo-hexofuranosyl-(1-->3)-D-Manp (8b) and p-nitrophenyl 3-deoxy-beta-D-xylo-hexofuranoside for studying the influence of HO-3 in the interaction with specific glycosidases. The disaccharide 8a, and its corresponding alditol, were good substrates for the beta-D-galactofuranosidase from Penicillium fellutanum, whereas the 3-deoxyglycosides were not hydrolyzed by the enzyme.
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Affiliation(s)
- C Marino
- CIHIDECAR, Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina
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39
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Choudhury AK, Roy N. Synthesis of some galactofuranosyl disaccharides using a galactofuranosyl trichloroacetimidate as donor. Carbohydr Res 1998. [DOI: 10.1016/s0008-6215(98)00062-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Johnston BD, Pinto BM. Use of a phenyl 1-selenogalactofuranoside as a glycosyl donor for the synthesis of galactofuranosyl-containing disaccharides. Carbohydr Res 1997; 305:289-92. [PMID: 9581281 DOI: 10.1016/s0008-6215(97)10016-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The use of acetylated phenyl 1-seleno-beta-D-galactofuranoside as a glycosyl donor for the synthesis of protected D-Galf-beta-(1-->3)-alpha-D-Manp as its methyl or ethylthio glycoside has been demonstrated. Activation of the selenoglycoside over a thioglycoside acceptor by NIS/TfOH is extremely selective and gives the ethylthio disaccharide in 91% yield. The parent disaccharide is found as a terminal and branched unit in the lipopeptidophosphoglycan oligosaccharides of the protozoan Trypanosoma cruzi, the causative agent of Chagas' disease.
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Affiliation(s)
- B D Johnston
- Department of Chemistry, Simon Fraser University, Burnaby, B.C., Canada
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