title: An Orthogonally Protected alpha,alpha-bis(aminomethyl)-beta-alanine building block for the construction of glycoconjugates on a solid support.
abstract: Synthetic glycoclusters are extensively used as mimetics of naturally occurring, multivalent carbohydrate ligands in various glycobiological applications. Their preparation, however, is far from trivial, and it still is a limiting factor in the study of carbohydrate binding. We herein report the synthesis of an orthogonally protected building block, N-Alloc-N'-Boc-N' '-Fmoc-alpha,alpha-bis(aminomethyl)-beta-alanine (1), and its use in the preparation of triantennary peptide glycoclusters (21-24) on a solid support. The assembly of the clusters involves removal of the amino protections of the solid-supported branching unit 1 in the order Fmoc, Boc, and Alloc, and subsequent coupling of peracetylated O-(glycopyranosyl)-N-Fmoc-L-serine pentafluorophenyl esters (galactose, glucose, mannose, and ribose) to each amino group exposed.
authors.affiliation: Department of Chemistry, University of Turku, FIN-20014 Turku, Finland. jokrka@utu.fi
authors.forename: Johanna
authors.initials: J
authors.lastname: Katajisto
authors.forename: Tuomas
authors.initials: T
authors.lastname: Karskela
authors.forename: Petri
authors.initials: P
authors.lastname: Heinonen
authors.forename: Harri
authors.initials: H
authors.lastname: Lönnberg
mesh_terms: D002241:Carbohydrates / Q000737:chemistry; D020650:Combinatorial Chemistry Techniques; D006001:Glycoconjugates / Q000138:chemical synthesis*; D006020:Glycopeptides / Q000138:chemical synthesis; D008024:Ligands; D018716:Molecular Mimicry
chemical_list: D002241:Carbohydrates; D006001:Glycoconjugates; D006020:Glycopeptides; D008024:Ligands