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Syntheses of deoxy analogues of methyl 3,6-di-O-α-d-mannopyranosyl-α-d-mannopyranoside for studies of the binding site of Concanavalin A

✍ Scribed by Stefan Oscarson; Ulf Tedebark

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
920 KB
Volume
278
Category
Article
ISSN
0008-6215

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✦ Synopsis

All of the monodeoxy analogues of methyl 3,6-di-O-alpha-D-mannopyranosyl-alpha-D-mannopyranoside have been synthesized together with two dideoxy (2,3'- and 4,3'-) analogues. The 2'- and 2"-deoxy functions were introduced by NIS-promoted couplings with 2,3,4-tri-O-acetyl-D-glucal as donor, followed by reduction of the resulting 2'- and 2"-iodo derivatives, whereas the 3'-, 3"-, 4'-, 4"-, 6'-, and 6"-deoxy functions were introduced by using known deoxyglycosyl chlorides as donors in coupling reactions promoted by silver trifluoromethanesulfonate. The 2- and 4-deoxy functions on the central mannose residue were introduced by displacement, using triiodoimidazole and triphenylphosphine, of a hydroxyl group by iodine on suitably protected derivatives followed by reduction of the resulting iodo analogues.

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