MODEL STUDIES PERTAINING TO THE HYDRAZINOLYSIS OF GLYCOPEPTIDES AND GLYCOPROTEINS: HYDRAZINOLYSIS OF THE 1-N-ACETYL AND 1-N-(L-β-ASPARTYL) DERIVATIVES OF 2-ACETAMIDO-2-DEOXY-β-D-GLUCOPYRANOSYLAMINE
The products of hydrazinolysis of the 1-N-acetyl and 1-N-(L-β-aspartyl) derivatives of 2-acetamido-2-deoxy-β-D-glucopyranosylamine could not be converted quantitatively into 2-amino-2-deoxy-D-glucose under mild conditions.Proton and (13)C-n.m.r. measurements indicated that the hydrazone of 2-amino-2-deoxy-D-glucose was a major product of the hydrazinolysis of 2-acetamido-1-N-acetyl-2-deoxy-β-D-glucopyranosylamine.Control experiments showed that acetohydrazide is slowly converted into 4-amino-3,5-dimethyl-1,2,4-triazole under the conditions of hydrazinolysis, and hat 2-amino-2-deoxy-D-glucose reacts slowly with acetohydrazide in dilute acetic acid.The implications of these results in relation to the hydrazinolysis of glycopeptides and glycoproteins are discussed.
Saeed, May S.,Williams, J. Michael
p. 83 - 94
(2007/10/02)
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