title: Syntheses of a series of lacto-N-neotetraose clusters using a carbosilane dendrimer scaffold.
abstract: 4-Pentenyl (2,3,4,6-tetra-O-acetyl-beta-d-galactopyranosyl)-(1-->4)-(3,6-di-O-acetyl-2-deoxy-2-phthalimido-beta-d-glucopyranosyl)-(1-->3)-(2,6-di-O-benzoyl-beta-d-galactopyranosyl)-(1-->4)-2,3,6-tri-O-benzoyl-beta-d-glucopyranoside (4) was synthesized by regioselective glycosylation of 4-pentenyl (2,6,-di-O-benzoyl-beta-d-galactopyranosyl)-(1-->4)-2,3,6-tri-O-benzoyl-beta-d-glucopyranoside and (2,3,4,6-tetra-O-acetyl-beta-d-galactopyranosyl)-(1-->4)-3,6-di-O-acetyl-2-deoxy-2-phthalimido-beta-d-glucopyranosyl chloride. By conversion of the protecting groups followed by thioacetylation, 4 was transformed into the corresponding lacto-N-neotetraose derivative, 5-(acetylthio)pentenyl (2,3,4,6-tetra-O-acetyl-beta-d-galactopyranosyl)-(1-->4)-O-(3,6-di-O-acetyl-2-acetamido-2-deoxy-beta-d-glucopyranosyl)-(1-->3)-(2,4,6-di-O-acetyl-beta-d-galactopyranosyl)-(1-->4)-2,3,6-tri-O-acetyl-beta-d-glucopyranoside (6). The lacto-N-neotetraose derivative 6 was introduced into carbosilane dendrimer cores of three shapes, and three kinds of new carbosilane dendrimers peripherally functionalized by lacto-N-neotetraose were obtained.
authors.affiliation: Department of Functional Materials Science, Faculty of Engineering, Saitama University, 255 Shimo-ohkubo, Sakura-ku, Saitama 338-8570, Japan.
authors.forename: Akihiro
authors.initials: A
authors.lastname: Yamada
authors.forename: Ken
authors.initials: K
authors.lastname: Hatano
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Koyama
authors.forename: Koji
authors.initials: K
authors.lastname: Matsuoka
authors.forename: Yasuaki
authors.initials: Y
authors.lastname: Esumi
authors.forename: Daiyo
authors.initials: D
authors.lastname: Terunuma
mesh_terms: D002236:Carbohydrate Conformation; D050091:Dendrimers / Q000737:chemistry*; D015394:Molecular Structure; D009844:Oligosaccharides / Q000138:chemical synthesis* / Q000737:chemistry* / Q000145:classification; D012821:Silanes / Q000737:chemistry*
chemical_list: D050091:Dendrimers; D009844:Oligosaccharides; D012821:Silanes; C504072:carbosilane; C013084:lacto-N-neotetraose