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

Article abstract of DOI:10.1016/0008-6215(95)00268-5

All of the monodeoxy analogues of methyl 3,6-di-O-α-D-mannopyranosyl-α-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.