Syntheses of deoxy analogues of methyl 3,6-di-O-alpha-D-mannopyranosyl-alpha-D-mannopyranoside for studies of the binding site of concanavalin A

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...

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Bibliographic Details
Published in:Carbohydrate research 1995-12, Vol.278 (2), p.271-287
Main Authors: Oscarson, S, Tedebark, U
Format: Article
Language:English
Subjects:
Binding Sites
Carbohydrate Conformation
Carbohydrate Sequence
Concanavalin A - chemistry
Deoxy Sugars - chemical synthesis
Deoxy Sugars - chemistry
Disaccharides - chemical synthesis
Disaccharides - chemistry
Magnetic Resonance Spectroscopy
Mass Spectrometry
Molecular Sequence Data
Molecular Structure
Trisaccharides - chemical synthesis
Trisaccharides - chemistry
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Summary: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.
ISSN:0008-6215
DOI:10.1016/0008-6215(95)00268-5