title: [A uniform approach to the synthesis of carbohydrate conjugates of polyhedral boron compounds as potential agents for boron neutron capture therapy].
abstract: A uniform approach to the synthesis of carbohydrate conjugates with polyhedral boron compounds (PBCs) was developed. Oligosaccharide derivatives with an aglycone moiety amino group can be coupled with PBC carboxyl derivatives using N-methyl-N-(4,6-dimethoxy-1,3,5-triazin-2-yl)morpholinium chloride as a coupling agent. Both N- and O-glycosides differing in the conformational mobility around the glycoside bond were shown to be useful as oligosaccharides with a functional group in the aglycone moiety. This allows the application of this approach to the synthesis of PBC conjugates with a wide range of oligosaccharides. For example, not only oligosaccharides obtained by chemical synthesis but also reducing oligosaccharides isolated from natural sources can be transformed into N-glycosides. The approach was tested by the example of conjugation of the carboxyl derivatives of ortho-carborane and dodecaborate anion with lactose as a model oligosaccharide. Lactose, an easily available disaccharide, is a ligand for lectins expressed on the surface of melanoma cells. The approach suggested is the first example of the synthesis of such conjugates that does not require protective groups for the carbohydrate residue. It is especially important for obtaining dodecaborate-carbohydrate conjugates for which the removal of protective groups is often a non-trivial task.
authors.forename: A V
authors.initials: AV
authors.lastname: Orlova
authors.forename: N N
authors.initials: NN
authors.lastname: Kondakov
authors.forename: A I
authors.initials: AI
authors.lastname: Zinin
authors.forename: B G
authors.initials: BG
authors.lastname: Kimel'
authors.forename: L O
authors.initials: LO
authors.lastname: Kononov
authors.forename: I B
authors.initials: IB
authors.lastname: Sivaev
authors.forename: V I
authors.initials: VI
authors.lastname: Bregadze
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000138:chemical synthesis* / Q000737:chemistry; D001896:Boron Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D016754:Boron Neutron Capture Therapy; D006801:Humans; D007785:Lactose / Q000138:chemical synthesis* / Q000737:chemistry; D008545:Melanoma / Q000532:radiotherapy
chemical_list: D000970:Antineoplastic Agents; D001896:Boron Compounds; C119788:dodecaborate; D007785:Lactose