Studies on Selectin Binding Inhibitors: Synthesis of Sialyl-Lewis X and Sialyl-Lewis A Epitope Analogs Containing 2-Acetamido Derivative ofN-Methyl-1-Deoxynojirimycin1

Abstract
Synthesis of sialyl-Lewis x (15) and sialyl-Lewis a (17) epitope analogs containing the 2-acetamido derivative of N-methyl-1-deoxynojirimycin has been achieved. A suitably protected 2-acetamido- 1-deoxynojirimycin derivative 5, prepared from 1-deoxynojirimycin via the epoxide intermediate 3, was successively coupled with methyl- 1-thioglycosides of L-fucose (6) and β-sialyl-(2→3)-D-galactose (9). The resulting tetrasaccharides (10 and 13) were each converted, by reductive N-methylation and deprotection, into the desired epitope analogs.

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