title: Stereoselective synthesis of 1,1'-linked alpha-l-lyxopyranosyl beta-d-glucopyranoside, the proposed biosynthetic precursor of the FG ring system of avilamycins.
abstract: The non-reducing disaccharide beta-d-Glcp-(1<-->1)-alpha-L-Lyxp1 had been proposed to be an early intermediate during the biosynthesis of avilamycin A [Boll, R.; Hofmann, C.; Heitmann, B.; Hauser, G.; Glaser, S.; Koslowski, T.; Friedrich, T.; Bechthold, A. J. Biol. Chem.2006, 281, 14756-14763]. This work describes a comparison of two strategies for the synthesis of 1 and its 2-amino-2-deoxy analog with either the glucose or the lyxose moiety acting as the glycosyl donor. The best results in terms of stereoselectivity and yield were obtained with 2,3,4-tri-O-acetyl-alpha-L-lyxopyranosyl trichloroacetimidate 13. Reaction of 13 with 2,3,4,6-tetra-O-acetyl-D-glucopyranose gave the disaccharide as mixture of 1beta,1'alpha and 1beta,1'beta isomers in a ratio of 10:1 and a yield of 50%. Reaction of 13 and 3,4,6-tri-O-acetyl-2-azido-2-deoxy-D-glucopyranose yielded the desired 1beta,1'alpha disaccharide as a single isomer in 72% yield. Interestingly, the formation of alpha-glucosides was not observed in any case, regardless of the use of glucose as glycosyl donor or acceptor.
authors.affiliation: Fachbereich Chemie, Universität Konstanz, Konstanz, Germany.
authors.forename: Magnus S
authors.initials: MS
authors.lastname: Schmidt
authors.forename: Valentin
authors.initials: V
authors.lastname: Wittmann
mesh_terms: D004187:Disaccharides / Q000138:chemical synthesis*; D006031:Glycosylation; D009844:Oligosaccharides / Q000096:biosynthesis*; D013237:Stereoisomerism
chemical_list: D004187:Disaccharides; D009844:Oligosaccharides; C531221:glucopyranosyl-1-1-lyxopyrranoside; C006653:avilamycin