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Synthesis of 4" manipulated Lewis X trisaccharide analogues.

ABSTRACT: Three analogues of the Le(x) trisaccharide antigen (?-D-Galp(1?4)[?-L-Fucp(1?3)]-D-GlcNAcp) in which the galactosyl residue is modified at O-4 as a methyloxy, deoxychloro or deoxyfluoro, were synthesized. We first report the preparation of the modified 4-OMe, 4-Cl and 4-F trichloroacetimidate galactosyl donors and then report their use in the glycosylation of an N-acetylglucosamine glycosyl acceptor. Thus, we observed that the reactivity of these donors towards the BF(3)·OEt(2)-promoted glycosylation at O-4 of the N-acetylglucosamine glycosyl acceptors followed the ranking 4-F > 4-OAc ? 4-OMe > 4-Cl. The resulting disaccharides were deprotected at O-3 of the glucosamine residue and fucosylated, giving access to the desired protected Le(x) analogues. One-step global deprotection (Na/NH(3)) of the protected 4"-methoxy analogue, and two-step deprotections (removal of a p-methoxybenzyl with DDQ, then Zemplén deacylation) of the 4"-deoxychloro and 4"-deoxyfluoro protected Le(x) analogues gave the desired compounds in good yields.

SUBMITTER: Moore CJ

PROVIDER: S-EPMC3458731 | biostudies-literature | 2012

REPOSITORIES: biostudies-literature

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Synthesis of 4" manipulated Lewis X trisaccharide analogues.

Moore Christopher J CJ Auzanneau France-Isabelle FI

Beilstein journal of organic chemistry 20120723

Three analogues of the Le(x) trisaccharide antigen (β-D-Galp(1→4)[α-L-Fucp(1→3)]-D-GlcNAcp) in which the galactosyl residue is modified at O-4 as a methyloxy, deoxychloro or deoxyfluoro, were synthesized. We first report the preparation of the modified 4-OMe, 4-Cl and 4-F trichloroacetimidate galactosyl donors and then report their use in the glycosylation of an N-acetylglucosamine glycosyl acceptor. Thus, we observed that the reactivity of these donors towards the BF(3)·OEt(2)-promoted glycosyl ...[more]

PMID: 23019441

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