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Murakami T, Hirono R, Sato Y, Furusawa K. Efficient synthesis of ω-mercaptoalkyl 1,2-trans-glycosides from sugar peracetates. Carbohydr Res 2007; 342:1009-20. [PMID: 17362892 DOI: 10.1016/j.carres.2007.02.024] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2007] [Revised: 02/16/2007] [Accepted: 02/20/2007] [Indexed: 11/24/2022]
Abstract
Lewis acid-promoted reactions of peracetylated sugars (glucose, galactose, maltose, lactose) with omega-bromo-1-alkanols (C(8), C(12)) were investigated. ZnCl(2) was found to promote the 1,2-trans-glycosylation of the alcohols in toluene at about 60 degrees C in a stereocontrolled manner with better yields than commonly employed promoters such as SnCl(4). The omega-bromoalkyl acetylated glycosides were readily converted to omega-mercaptoalkyl glycosides, which are useful for the preparation of glycoclusters.
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Affiliation(s)
- Teiichi Murakami
- Institute for Biological Resources and Functions, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, Tsukuba, Ibaraki 305-8565, Japan.
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52
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Dasgupta‡ S, Rajput‡ VK, Roy B, Mukhopadhyay B. Lanthanum Trifluoromethane-sulfonate‐Catalyzed Facile Synthesis of Per‐O‐acetylated Sugars and Their One‐Pot Conversion to S‐Aryl and O‐Alkyl/Aryl Glycosides. J Carbohydr Chem 2007. [DOI: 10.1080/07328300701298170] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Somnath Dasgupta‡
- a Medicinal and Process Chemistry Division , Central Drug Research Institute, Chattar Manzil Palace , Lucknow, 226001, UP, India
| | - Vishal Kumar Rajput‡
- a Medicinal and Process Chemistry Division , Central Drug Research Institute, Chattar Manzil Palace , Lucknow, 226001, UP, India
| | - Bimalendu Roy
- a Medicinal and Process Chemistry Division , Central Drug Research Institute, Chattar Manzil Palace , Lucknow, 226001, UP, India
| | - Balaram Mukhopadhyay
- a Medicinal and Process Chemistry Division , Central Drug Research Institute, Chattar Manzil Palace , Lucknow, 226001, UP, India
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53
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Fahmi NE, Dedkova L, Wang B, Golovine S, Hecht SM. Site-Specific Incorporation of Glycosylated Serine and Tyrosine Derivatives into Proteins. J Am Chem Soc 2007; 129:3586-97. [PMID: 17338522 DOI: 10.1021/ja067466n] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Glycosylation of proteins can have a dramatic effect on their physical, chemical, and biological properties. Analogues of dihydrofolate reductase and firefly luciferase containing glycosylated amino acids at single, predetermined sites have been elaborated. Misacylated suppressor tRNAs activated with glycosylated serine and tyrosine derivatives were used for suppression of the nonsense codons in a cell-free protein biosynthesizing system, thereby permitting the preparation of the desired glycosylated proteins. In this fashion, it was possible to obtain proteins containing both mono- and diglycosylated amino acids, including glycosylated serine and tyrosine moieties. For the modified firefly luciferases, the effect of these substitutions on the wavelength of the light emitted by firefly luciferase was investigated. The maximum wavelength for mutants containing peracetylated glycosylated serine derivatives at position 284 showed a red shift in the emission spectra. For mutants containing glycosylated tyrosines, the red shift was observed only when the carbohydrate moiety was fully deacetylated.
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Affiliation(s)
- Nour Eddine Fahmi
- Department of Chemistry, University of Virginia, Charlottesville, Virginia 22901, USA
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54
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Bernardes GJL, Marston JP, Batsanov AS, Howard JAK, Davis BG. A trisulfide-linked glycoprotein. Chem Commun (Camb) 2007:3145-7. [PMID: 17653369 DOI: 10.1039/b706682a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first member of a novel class of chemoselective reagents, glycosyl methanedithiosulfonates, has been synthesized, identified and employed in the first examples of chemical, site-selective construction of a trisulfide-modified protein with complete conversion.
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Affiliation(s)
- Gonçalo J L Bernardes
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford, UKOX1 3TA
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55
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Janin YL, Zoltobroda G, Huel C, Monneret C. SYNTHESIS OF CHLORAMPHENICOL AND MANDELONITRILE GALACTOSE-CONTAINING PRODRUGS. J Carbohydr Chem 2006. [DOI: 10.1081/car-120013493] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Yves L. Janin
- a UMR 176 , CNRS-Institut Curie , 26 rue d'Ulm, Paris, Cedex 05, 75248, France
| | - Grégory Zoltobroda
- a UMR 176 , CNRS-Institut Curie , 26 rue d'Ulm, Paris, Cedex 05, 75248, France
| | - Christiane Huel
- b U 350 , INSERM-Institut Curie , Bat. 110 Campus Universitaire, Orsay, F-91405, France
| | - Claude Monneret
- a UMR 176 , CNRS-Institut Curie , 26 rue d'Ulm, Paris, Cedex 05, 75248, France
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56
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Bernardes GJL, Gamblin DP, Davis BG. The Direct Formation of Glycosyl Thiols from Reducing Sugars Allows One-Pot Protein Glycoconjugation. Angew Chem Int Ed Engl 2006; 45:4007-11. [PMID: 16673441 DOI: 10.1002/anie.200600685] [Citation(s) in RCA: 106] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Gonçalo J L Bernardes
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA, UK.
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57
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Bernardes GJL, Gamblin DP, Davis BG. The Direct Formation of Glycosyl Thiols from Reducing Sugars Allows One-Pot Protein Glycoconjugation. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200600685] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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58
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Reynolds AJ, Haines AH, Russell DA. Gold glyconanoparticles for mimics and measurement of metal ion-mediated carbohydrate-carbohydrate interactions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:1156-63. [PMID: 16430279 DOI: 10.1021/la052261y] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
To mimic and measure calcium ion-mediated carbohydrate-carbohydrate interactions, four lactose derivatives have been synthesized for assembly on gold nanoparticles. The series of lactose derivatives varied by the length of the thiolated ethylene glycol anchor chain [O(CH2CH2O)(m)CH2CH2SH; where m = 0, 1, 2, and 3] used to self-assemble the carbohydrates to the preformed gold nanoparticles of ca. 16 nm diameter. Upon addition of calcium ions to the lactose-stabilized nanoparticles, rapid carbohydrate-carbohydrate interactions were visualized and subsequently measured using UV-visible spectrometry and transmission electron microscopy (TEM). The nanoparticle aggregates formed via metal-mediated carbohydrate-carbohydrate interactions could be readily redispersed through the addition of EDTA. Multiple reaggregation and redispersion cycles were achieved, confirming that the aggregation process was due to metal ion-mediated carbohydrate interactions rather than calcium chelation by residual citrate ions on the particle surface. The essential involvement of the lactose moiety in Ca2+ complexation was shown by control measurements on related D-glucose-derivatized nanoparticles, where a significantly reduced aggregation response was obtained only at high ion concentrations. Other group 2 metal ions with radii larger than that of calcium, viz., barium and strontium, were also shown to mediate the aggregation of the lactose-stabilized nanoparticles. The induced aggregation of the lactose nanoparticles was determined to be quantitatively dependent upon the calcium ion concentration. Furthermore, the analytical sensitivity of the calcium-induced aggregation and the linear dynamic range were dependent on the length of the ethylene glycol anchor chain. The shortest ethylene glycol chain (m = 0) gave the most sensitive response with the optimum limit of detection (0.8 mM Ca2+), whereas the longest ethylene glycol chain (m = 3) provides a measurement of calcium ion concentration over the largest linear dynamic range (10-35 mM Ca2+). This work has shown that the self-assembled deposition of lactose derivatives on gold nanoparticles provides multivalent carbohydrate surfaces that can be used as mimics for the measurement of biologically relevant carbohydrate-carbohydrate interactions. Additionally, this study has highlighted the importance of the structure and length of the ligand that anchors the carbohydrate sugar to the gold particle surface to facilitate such carbohydrate interactions and for "tuning" the analytical characteristics of bioassays developed using metal nanoparticle technology.
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Affiliation(s)
- Angela J Reynolds
- School of Chemical Sciences and Pharmacy, University of East Anglia, Norwich, Norfolk, NR4 7TJ UK
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59
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60
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Grayson EJ, Ward SJ, Hall AL, Rendle PM, Gamblin DP, Batsanov AS, Davis BG. Glycosyl Disulfides: Novel Glycosylating Reagents with Flexible Aglycon Alteration. J Org Chem 2005; 70:9740-54. [PMID: 16292802 DOI: 10.1021/jo051374j] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] Glycosyl disulfides have been shown for the first time to be effective glycosyl donors. Glucosylation and galactosylation of a panel of representative alcohol acceptors allowed the formation of 28 simple glycosides, disaccharides, and glycoamino acids in yields of up to 90%. As well as providing a novel class of effective glycosyl donors, the ability to easily alter the nature of the aglycon and the ability to differently activate donors that differ only in their aglycon simply through altering conditions lends glycosyl disulfide donors to their use in latent-active reactivity tuning strategies.
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Affiliation(s)
- Elizabeth J Grayson
- Department of Chemistry, University of Durham, South Road, Durham, UK, DH1 3LE
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61
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Chakka N, Johnston BD, Pinto BM. Synthesis and conformational analysis of disaccharide analogues containing disulfide and selenosulfide functionalities in the interglycosidic linkages. CAN J CHEM 2005. [DOI: 10.1139/v05-107] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The synthesis of novel disaccharides containing disulfide (methyl-4-S-(β-D-galactopyranosyl-1'-thio)-4-thio-α-D-glucopyranoside (1)) and selenosulfide (methyl-4-Se-(β-D-galactopyranosyl-1'-thio)-4-seleno-α-D-glucopyranoside (2)) functionalities in the interglycosidic linkages is described. The synthetic strategy relied on the reaction of a β-glycosylthiosulfonate with a carbohydrate thiol or selenol nucleophile. The resulting protected β-dihetero-linked disaccharides were deprotected to give the target compounds. The conformational preferences of these dihetero analogues were inferred from NOESY experiments and line-broadening effects in variable-temperature NMR spectra, and are rationalized in terms of molecular orbital theory. Low-energy conformations of these compounds can populate regions of conformational space not usually occupied by β-linked disaccharides, and offer the possibility for presentation of novel ligand topographies.Key words: disaccharides, disulfides, selenosulfides, interglycosidic linkages, conformations, MO explanation.
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62
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Goddard-Borger ED, Stick RV. The Synthesis of Various 1,6-Disulfide-Bridged D-Hexopyranoses. Aust J Chem 2005. [DOI: 10.1071/ch04277] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
1,6-Disulfide-bridged derivatives have been prepared for d-gluco-, d-manno-, d-allo-, d-galacto-, and d-talo-pyranose, in the main by the nucleophilic attack of a C6 thiolate onto an anomeric thiosulfonate. The d-gluco disulfide, ‘angyalosan’, was successfully oxidized to a single thiosulfinate.
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63
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Mikata Y, Sugai Y, Yano S. Control of Oxygen Atom Chirality and Chelate Ring Conformation by Protected/Free Sugar Hydroxyl Groups in Glucose-Pendant Dipicolylamine−Copper(II) Complexes. Inorg Chem 2004; 43:4778-80. [PMID: 15285641 DOI: 10.1021/ic0496323] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A pair of copper(II) complexes 1 and 2 exhibit an enantiomeric chiral center at the oxygen atom that coordinates to the metal center. The configurations of the oxygen atom chirality and the chelate ring conformation are simply controlled by protected/free hydroxyl groups of the sugar moiety, yielding mirror image CD spectra. In this system, repulsive and attractive forces are used to regulate chirality on the copper-coordinated oxygen atom both in the solid state and in solution.
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Affiliation(s)
- Yuji Mikata
- KYOUSEI Science Center and Division of Material Science, Nara Women's University, Nara 630-8506, Japan.
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64
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Illyés TZ, Molnár-Gábor D, Szilágyi L. Novel approaches to the syntheses of N-substituted S-glycosyl-sulfenamides. Carbohydr Res 2004; 339:1561-4. [PMID: 15178402 DOI: 10.1016/j.carres.2004.03.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2004] [Accepted: 03/23/2004] [Indexed: 11/27/2022]
Abstract
Bis(tetra-O-acetyl-beta-D-glucopyranosyl)disulfide reacts, under silver ion activation, with primary and secondary aliphatic as well as aromatic amines to furnish the title compounds in moderate to good yields. The same derivatives could also be obtained from (tetra-O-acetyl)-beta-D-glucopyranosyl methanethiolsulfonate 1 by nucleophilic substitution with amines. It was shown that the polarization of the S-S-bond in 1 is enhanced by Ag+ so as to allow reaction with sterically hindered amines as well.
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Affiliation(s)
- Tünde-Zita Illyés
- Department of Organic Chemistry, University of Debrecen, H-4010 Debrecen Pf. 20, Hungary
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65
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Yu Y, Ko KS, Zea CJ, Pohl NL. Discovery of the Chemical Function of Glycosidases: Design, Synthesis, and Evaluation of Mass-Differentiated Carbohydrate Libraries. Org Lett 2004; 6:2031-3. [PMID: 15176811 DOI: 10.1021/ol049389b] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text] Discovery of the catalytic chemical function of the many putative glycosidases coded in genomes currently relies on individual testing of possible substrates, usually as their p-nitrophenol conjugate. Herein, we present an alternative chemical proteomics approach using a synthetic mass-differentiated heat-stable substrate library with mass spectrometry readout. Library components do not serve as reaction inhibitors and both primary and secondary enzyme substrates can be delineated.
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Affiliation(s)
- Yang Yu
- Department of Chemistry and the Plant Sciences Institute, Gilman Hall, Iowa State University, Ames, Iowa 50011-3111, USA
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66
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Jacquemard U, Routier S, Tatibouët A, Kluza J, Laine W, Bal C, Bailly C, Mérour JY. Synthesis of diphenylcarbazoles as cytotoxic DNA binding agents. Org Biomol Chem 2004; 2:1476-83. [PMID: 15136803 DOI: 10.1039/b401445f] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the synthesis of a series of novel diphenylcarbazoles designed to interact with DNA. The compounds bearing two or three dimethylaminoalkyloxy side chains were found to bind much more tightly to DNA, preferentially at AT-rich sites, than the corresponding hydroxy compounds. The DNA binding compounds exhibit potent cytotoxic activity toward P388 leukemia cells. The 3,6-diphenylcarbazole thus represent an interesting scaffold to develop antitumor agents interacting with nucleic acids.
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Affiliation(s)
- Ulrich Jacquemard
- Institut de Chimie Organique et Analytique, UMR 6005, Universite d'Orleans, B.P. 6759, 45067 Orleans 2, France
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67
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Watt GM, Boons GJ. A convergent strategy for the preparation of N-glycan core di-, tri-, and pentasaccharide thioaldoses for the site-specific glycosylation of peptides and proteins bearing free cysteines. Carbohydr Res 2004; 339:181-93. [PMID: 14698875 DOI: 10.1016/j.carres.2003.10.029] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Mammalian glycoprotein biosynthesis produces heterogeneous ranges of proteins that possess the same peptide backbone but differ in the nature and site of glycosylation. This feature has frustrated efforts to develop therapeutic glycoproteins as well as the elucidation of biological functions of individual glycoforms. We have developed an attractive approach to well-defined glycoforms of glycoproteins by oxidative coupling of thioaldoses to cysteine-containing peptides and proteins to give disulfide-linked neoglycoconjugates. To this end, the chemical synthesis di-, tri-, and pentasaccharide N-glycan thioaldoses was undertaken. A convergent approach was used for the preparation of the pentasaccharide containing a 'synthetically difficult' beta-mannoside linkage. This linkage was installed by forming initially the corresponding beta-glucoside-containing pentasaccharide, followed by inversion of configuration at C-2. This approach exploited a levulonyl ester at C-2 of a glucosyl donor, which directed the coupling to give the beta-glucoside exclusively and could be removed selectively using hydrazine acetate without affecting other base-labile functionalities. The resulting alcohol was converted into a triflate, which was displaced by tri-n-butylammonium acetate to give a beta-mannosidic linkage. The trisaccharide N-glycan was prepared in a similar manner. Thioaldoses were prepared by displacing the peracetylated alpha-glycosyl chlorides with thioacetate to give the peracetylated beta-thioacetates, which upon saponification gave the desired compounds. The incubation of molar excesses of chitobiose thioaldose with cysteine-containing glutathione and BSA resulted in the site-specific formation of a disulfide-linked neoglycopeptide and neoglycoprotein, respectively.
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Affiliation(s)
- Gregory M Watt
- Complex Carbohydrate Research Center, University of Georgia, 220 Riverbend Road, Athens, GA 30602, USA
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68
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Davis BG, Sala RF, Hodgson DRW, Ullman A, Khumtaveeporn K, Estell DA, Sanford K, Bott RR, Jones JB. Selective protein degradation by ligand-targeted enzymes: towards the creation of catalytic antagonists. Chembiochem 2003; 4:533-7. [PMID: 12794865 DOI: 10.1002/cbic.200300591] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Benjamin G Davis
- Dyson Perrins Laboratory Department of Chemistry, University of Oxford South Parks Road, Oxford, OX1 3QY, UK.
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69
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Guan L, Sahin-Tóth M, Kálai T, Hideg K, Kaback HR. Probing the mechanism of a membrane transport protein with affinity inactivators. J Biol Chem 2003; 278:10641-8. [PMID: 12471022 DOI: 10.1074/jbc.m211355200] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Affinity inactivators are useful for probing catalytic mechanisms. Here we describe the synthesis and properties of methanethiosulfonyl (MTS) galactose or glucose derivatives with respect to a well studied membrane transport protein, the lactose permease of Escherichia coli. The MTS-galactose derivatives behave as affinity inactivators of a functional mutant with Ala(122)-->Cys in a background otherwise devoid of Cys residues. A proton electrochemical gradient (Deltamu(H(+))) markedly increases the rate of reaction between Cys(122) and MTS-galactose derivatives; nonspecific labeling with the corresponding MTS-glucose derivatives is unaffected. When the Ala(122)-->Cys mutation is combined with a mutation (Cys(154)-->Gly) that blocks transport but increases binding affinity, discrimination between the MTS-galactose and -glucose derivatives is abolished, and Deltamu(H(+)) has no effect. The results provide strong confirmation that the non-galactosyl moiety of permease substrates abuts Ala(122) in helix IV. In addition, the findings demonstrate that the MTS-galactose derivatives do not react with the Cys residue at position 122 upon binding per se but at a subsequent step in the overall transport mechanism. Thus, these inactivators behave as unique suicide substrates.
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Affiliation(s)
- Lan Guan
- Howard Hughes Medical Institute, Department of Physiology, UCLA, Los Angeles, California 90095-1662, USA
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70
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Affiliation(s)
- Benjamin G Davis
- Dyson Perrins Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QY, UK.
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71
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Preparation of an N-Linked Glycopeptide Containing 6-ThioGlcNAc. B KOREAN CHEM SOC 2002. [DOI: 10.5012/bkcs.2002.23.1.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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72
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Abstract
Covalent modification methods allow an almost unlimited range of functionality to be introduced into proteins. In concert with genetic techniques, chemical strategies have had significant impact in the field of enzyme design. Major recent developments include introducing catalytic activity into inactive proteins, modifying the selectivity and/or reactivity of existing enzymes and designing novel enzyme-based biosensors. New chemical methods promise to further increase the range of functionality that can be incorporated into proteins. These results suggest that semi-synthetic methods will play a key role in the development of future biocatalysts.
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Affiliation(s)
- C M Tann
- Department of Chemistry, University of Minnesota, Minneapolis, MN 55455, USA
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73
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Elaboration of a novel type of interglycosidic linkage: syntheses of disulfide disaccharides. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(01)00578-0] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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74
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Shin I, Jung HJ, Lee MR. Chemoselective ligation of maleimidosugars to peptides/protein for the preparation of neoglycopeptides/neoglycoprotein. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(00)02286-3] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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