title: A convergent approach to biocompatible polyglycerol "click" dendrons for the synthesis of modular core-shell architectures and their transport behavior.
abstract: Dendrimers are an important class of polymeric materials for a broad range of applications in which monodispersity and multivalency are of interest. Here we report on a highly efficient synthetic route towards bifunctional polyglycerol dendrons on a multigram scale. Commercially available triglycerol (1), which is highly biocompatible, was used as starting material. By applying Williamson ether synthesis followed by an ozonolysis/reduction procedure, glycerol-based dendrons up to the fourth generation were prepared. The obtained products have a reactive core, which was further functionalized to the corresponding monoazido derivatives. By applying copper(I)-catalyzed 1,3-dipolar cycloaddition, so-called "click" coupling, a library of core-shell architectures was prepared. After removal of the 1,2-diol protecting groups, water-soluble core-shell architectures 24-27 of different generations were obtained in high yields. In the structure-transport relationship with Nile red we observe a clear dependence on core size and generation of the polyglycerol dendrons.
authors.affiliation: Institut für Chemie und Biochemie, Freie Universität Berlin, Takustrasse 3, 14195 Berlin, Germany.
authors.forename: Monika
authors.initials: M
authors.lastname: Wyszogrodzka
authors.forename: Rainer
authors.initials: R
authors.lastname: Haag
mesh_terms: D001672:Biocompatible Materials / Q000138:chemical synthesis* / Q000737:chemistry; D003432:Cross-Linking Reagents / Q000138:chemical synthesis; D050091:Dendrimers / Q000138:chemical synthesis* / Q000737:chemistry; D004986:Ether / Q000737:chemistry; D005456:Fluorescent Dyes / Q000737:chemistry; D005990:Glycerol / Q000737:chemistry*; D010078:Oxazines / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D012995:Solubility; D014867:Water / Q000737:chemistry
chemical_list: D001672:Biocompatible Materials; D003432:Cross-Linking Reagents; D050091:Dendrimers; D005456:Fluorescent Dyes; D010078:Oxazines; D011108:Polymers; D014867:Water; D004986:Ether; C043941:polyglycerol; C044808:nile red; D005990:Glycerol