title: Muramic acid derivatives as glycosyl donors for the synthesis of muramyl-containing glycosphingolipids and fatty acids.
abstract: 2-Azido-2-deoxy-4,6-O-isopropylidene-3-O-[(1R)-(methoxycarbonyl)ethyl]- alpha-D-glucopyranosyl trichloroacetimidate (3 alpha) has been used as the glycosyl donor in the synthesis of glycosphingolipids 14 and 27. Reaction of 3 alpha with (2S, 3R, 4E)-2-azido-3-benzoyloxy-4-octadecen-1-ol (6) gave (2S, 3R, 4E)-2-azido-1-(2-azido-2-deoxy-4,6-O-isopropylidene-3-O-[(1R)-1-(m ethoxycarbonyl)ethyl]-beta-D-glucopyranosyloxyl)-3-benzoyloxy-4- octadecene (7), which was converted into (2S, 3R, 4E)-1-(2-deoxy-2-hexadecanoylamino-3-O-[(2R)-propanoyl-(L-alanyl-D -isoglutamine benzyl ester)-2-yl]-beta-D-glucopyranosyloxy)-2-hexadecanoylamino-4-oc tadecen-ol (14). Reaction of 3 alpha with tert-butyldimethylsilyl 2-azido-3,6-di-O-benzyl-2-deoxy-beta-D-glucopyranoside (15) gave tert-butyldimethylsilyl 2-azido-4-O-(2-azido-2-deoxy-4,6-O-isopropylidene-3-O-[(1R)-1-(methox ycarbonyl)ethyl]-beta-D-glucopyranosyl)-3,6-di-O-benzyl-2-deoxy-be ta- D-gluc opyranoside (16 beta), which was converted into 1,3,6-tri-O-acetyl-2-deoxy-4-O-(4,6-di-O-acetyl-2-deoxy-2-hexadecanoy lam ino-3-O-[2R)-propanoyl-(L-alanyl-D-isoglutamine methyl ester)-2-yl]-beta-D-glucopyranosyl)-2-hexadecanoylamino-D-glucopyranose (27).
authors.affiliation: Fakultät für Chemie, Universität Konstanz, F.R.G.
authors.forename: A
authors.initials: A
authors.lastname: Toepfer
authors.forename: R R
authors.initials: RR
authors.lastname: Schmidt
mesh_terms: D002240:Carbohydrate Sequence; D055598:Chemical Phenomena; D002621:Chemistry; D005227:Fatty Acids / Q000138:chemical synthesis*; D006028:Glycosphingolipids / Q000138:chemical synthesis*; D006031:Glycosylation; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D015394:Molecular Structure; D009112:Muramic Acids / Q000138:chemical synthesis*
chemical_list: D005227:Fatty Acids; D006028:Glycosphingolipids; D009112:Muramic Acids