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Reaction of 2,3,4-trio-O-acetyl-alpha-L-fucopyranosyl bromide (1) with thiourea (2), followed by reductive cleavage of the product, gave 2,3,4-tri-O-acetyl-1-thio-beta-L-fucopyranose (4). Reaction of 4 with p-nitrobenzyl bromide followed by O-deacylation yielded p-nitrobenzyl 1-thio-beta-L-fucopyranoside (6). Similar reaction conditions were used for the synthesis of p-nitrobenzyl 1-thio-beta-D-fucopyranoside (11) and 1-thio-alpha-D-mannopyranoside (16). A facile preparation of O-acylated p-nitrophenyl 1-thioglycopyranosides was achieved by condensing the appropriate glycosyl halide with sodium p-nitrobenzenethioxide in N,N-dimethylformamide.
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