Hydrogelation and spontaneous fiber formation of 8-aza-7-deazaadenine nucleoside ‘click’ conjugates |
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Authors: | Frank Seela,Suresh S. Pujari,Andreas H. Schä fer |
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Affiliation: | a Laboratory of Bioorganic Chemistry and Chemical Biology, Center for Nanotechnology, Heisenbergstraße 11, 48149 Münster, Germany b Laboratorium für Organische und Bioorganische Chemie, Institut für Chemie, Universität Osnabrück, Barbarastraße 7, 49069 Osnabrück, Germany c nanoAnalytics GmbH, Center for Nanotechnology, Heisenbergstraße 11, 48149 Münster, Germany |
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Abstract: | Nucleoside hydrogels based on benzyl azide ‘click’ conjugates of 8-aza-7-deaza-2′-deoxyadenosine bearing 7-ethynyl, 7-octa-(1,7-diynyl), and 7-tri-prop-2-ynyl-amine side chains were synthesized (1, 3, 4). The cycloaddition adduct with the shortest linker (1) yields the most powerful hydrogelator forming stable gels at a concentration of 0.3 wt % of 1 in water. One molecule of 1 catches 7500 water molecules. Cycloaddition of the 8-aza-7-deaza-7-azido-2′-deoxyadenosine (9) and 3-phenyl-1-propyne (10) leads to the isomeric conjugate 2, with a C-N connectivity between the nucleobase and triazole moiety. This gel is less stable than that of the adduct 1. Both gels show a similar stability over a wide pH range (4.0-10.0). Xerogels of 1 and 2 studied by scanning electron microscopy (SEM) reveal that both click adducts (1 and 2) form long fibers spontaneously. |
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Keywords: | Modified nucleosides Hydrogelation &lsquo Click&rsquo conjugates Pyrazolo[3,4-d]pyrimidines |
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