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Volumn , Issue 5, 1998, Pages 479-482

A facile access to aryl α-sialosides: The combination of a volatile amine base and acetonitrile in glycosidation of sialosyl chlorides

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EID: 0041665430     PISSN: 09365214     EISSN: None     Source Type: Journal    
DOI: 10.1055/s-1998-1717     Document Type: Article
Times cited : (18)

References (75)
  • 14
    • 0026445723 scopus 로고
    • Lasky, L. A. Science 1992, 258, 964-969.
    • (1992) Science , vol.258 , pp. 964-969
    • Lasky, L.A.1
  • 24
    • 27544478687 scopus 로고
    • Harlan, J., Liu, D., Ed. W. H. Freeman and company: New York, chapter 2
    • Lasky, L. A. Adhesion: its role in inflammatory disease; Harlan, J., Liu, D., Ed. W. H. Freeman and company: New York, 1992, chapter 2.
    • (1992) Adhesion: Its Role in Inflammatory Disease
    • Lasky, L.A.1
  • 60
    • 27544444908 scopus 로고    scopus 로고
    • note
    • 1,2-Dichloroethane and dichloromethane as a solvent made the reaction very slow. Moreover, in the case of tetrahydrofuran and 1,4-dioxane as a solvent, the reaction hardly proceeded.
  • 62
    • 27544445345 scopus 로고    scopus 로고
    • note
    • 21 (3a, 100 mg, 0.17 mmol) was added to a solution of 4-methylumbelliferone (4-methyl-2-oxo-2H-1-benzopyran-7-ol) (302 mg, 1.71 mmol) and diisopropyl-ethylamine (245 μl, 1.41 mmol) in acetonitrile (4 ml) at room temperature for 3 h. A reaction mixture was concentrated in vacuo and diluted with toluene for three times.
  • 68
    • 27544512614 scopus 로고    scopus 로고
    • note
    • 26
  • 69
    • 27544475117 scopus 로고    scopus 로고
    • note
    • D -37.3 (c, 1.10 chloroform)] in acetic acid (4 mL) was added acetyl chloride (0.4 mL) and dry HCl gas was bubbled (15-20 min) at 4 °C. The reaction flask was stoppered, and the mixture was stirred at room temperature for 3 h. In most cases, the disappearance of the starting material was confirmed within 3 h by TLC analysis. If the starting material was still observed at this stage, HCl gas was further bubbled for 2-3 min and the reaction was further continued. The workup procedure was as followed. The mixture was concentrated in vacuo. The residue was concentrated with toluene for several times to remove acetic acid. The residue was chromatographed on silica gel and the desired fractions were concentrated in vacua. The glycosyl chloride was obtained as a solid (89 mg, 93 %). This was employed in the next step without further purification. The glycosyl chloride related to KDN could be prepared in same manner. Although, starting from an anomeric mixture of peracetates, the substitution with chloride proceeds, the authors recommends the use of pure β-anomer of peracetate as the starting material. As the reaction of α-anomer is slow, the prolonged reaction until the complete disappearance of the both anomers of starting peracetates brought about the further substitution at 9-position as well as the decomposition (substitution with hydroxy group at 2-position) of desired product.


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