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1.2- trans Glycosyl azides

Synthesis of, 2-trans Glycosyl Azides from Glycosyl Halides... [Pg.104]

Tetra-O -acetyl-B-D-gluco- and -galacto-pyranosylamines (1) have been obtained from the corresponding glycosyl azides (2) by Staudinger reaction followed by hydrolysis of the intermediate phosphinimines (3) alternative reactions of intermediates (3) with carbon dioxide yielded the 1,2-trans-carbamates ( )... [Pg.101]

Addition of iodine azide to the D-glucal derivatives (39) gave mostly 2-deoxy-2-iodo-glycosyl azides (40) derived from trans-diaxial addition to the double bond. D-galactal and D-xylal derivatives... [Pg.79]

Uronic acid azides constitute important precursors for A -glycosyl amino acids and their various peptide derivatives, and may be formed by a comparable pathway. Thus, the treatment of acetyl-protected uronic acid esters with tri-methylsilyl azide and SnCU gives the desired acetylated 1,2-trans methyl (o-glycopyranosyl azide)uronates in crystalline form. " Whereas the yields for the gluco 61 and galacto derivatives 62 are satisfactory, the manno analog 63 was obtained in only 11 % yield. Even with an excess of trimethylsilyl azide, the results could not be improved. ... [Pg.114]

See other pages where 1.2- trans Glycosyl azides is mentioned: [Pg.107]    [Pg.115]    [Pg.121]    [Pg.122]    [Pg.127]    [Pg.107]    [Pg.115]    [Pg.121]    [Pg.122]    [Pg.127]    [Pg.153]    [Pg.332]    [Pg.105]    [Pg.126]    [Pg.126]    [Pg.152]    [Pg.143]    [Pg.220]    [Pg.470]    [Pg.26]    [Pg.142]    [Pg.340]    [Pg.37]    [Pg.44]    [Pg.85]    [Pg.596]    [Pg.177]    [Pg.583]    [Pg.177]    [Pg.113]    [Pg.115]    [Pg.133]    [Pg.145]    [Pg.29]    [Pg.144]    [Pg.316]    [Pg.316]    [Pg.474]    [Pg.141]   


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Glycosyl azides

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