Mannosylation with 2,3,4,6-tetra-O-benzoyl-_-D-[1-13C]mannopyranosyl bromide as a glycosyl donor has been used for the synthesis of 3,6-branched mannotri- and -pentaoside bearing labelled terminal mannopyranose units. Methyl 2,4-di-O-benzoyl-_-Dmannopyranoside was used as the glycosyl acceptor for the synthesis of the trisaccharide and also converted into a disaccharide precursor for the pentasaccharide.
Synthesis of mono- and ditrityl ethers of mannobiosides and mannotriosides as precursors for higher mannooligosaccharides is described. Advantage is taken of selective glycosylation of primary-secondary ditrityl ethers and selective removal of O-acetyl protective groups in the presence of O-benzoyl protective groups.
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