Hydrogelation and spontaneous fiber formation of 8-aza-7-deazaadenine nucleoside `click' conjugates

Autor(en): Seela, Frank
Pujari, Suresh S.
Schaefer, Andreas H.
Stichwörter: `Click' conjugates; AZIDE; Chemistry; Chemistry, Organic; GELATION ABILITY; GELATORS; GUANOSINE; HELIX FORMATION; Hydrogelation; Modified nucleosides; ORGANOGELS; Pyrazolo[3,4-d]pyrimidines; WATER GELATION
Erscheinungsdatum: 2011
Herausgeber: PERGAMON-ELSEVIER SCIENCE LTD
Journal: TETRAHEDRON
Volumen: 67
Ausgabe: 38
Startseite: 7418
Seitenende: 7425
Zusammenfassung: 
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. (C) 2011 Elsevier Ltd. All rights reserved.
ISSN: 00404020
DOI: 10.1016/j.tet.2011.07.015

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