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Fluoride-promoted esterification (FPE) chemistry: A robust route to Bis-MPA dendrons and their postfunctionalization
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology.ORCID iD: 0000-0002-9200-8004
2016 (English)In: Molecules, ISSN 1420-3049, E-ISSN 1420-3049, Vol. 21, no 3, 366Article in journal (Refereed) PublishedText
Abstract [en]

Bifunctional dendrons based on 2,2-bis(methylol)propionic acid (bis-MPA) are highly desirable scaffolds for biomedical applications. This is due to their flawless nature and large and exact number of functional groups as well as being biodegradable and biocompatible. Herein, we describe a facile divergent growth approach to their synthesis from monobenzylated tetraethylene glycol and post functionalization utilizing fluoride-promoted esterification (FPE) chemistry protocols. The scaffolds, presenting selectively deprotectable hydroxyls in the periphery and at the focal point, were isolated on a multigram scale with excellent purity up to the fourth generation dendron with a molecular weight of 2346 Da in seven reactions with a total yield of 50%. The third generation dendron was used as a model compound to demonstrate its functionalizability. Selective deprotection of the dendron's focal point was achieved with an outstanding yield of 94%, and biotin as well as azido functionalities were introduced to its focal point and periphery, respectively, through FPE chemistry. Bulky disperse red dyes were clicked through CuAAC to the dendron's azido groups, giving a biotinylated dendron with multivalent dyes with a molecular weight of 6252 Da in a total yield of 37% in five reactions with an average yield of 82% starting from the third generation focally and peripherally protected dendron. FPE chemistry proved to be a superb improvement over previous protocols towards bis-MPA dendrons as high purity and yields were obtained with less toxic solvents and greatly improved monomer utilization.

Place, publisher, year, edition, pages
MDPI AG , 2016. Vol. 21, no 3, 366
Keyword [en]
Biotin, Bis-MPA, Carbonyl diimidazole, CuAAC click chemistry, Dendritic polymers, Dendron, FPE chemistry, Polyesters
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-187297DOI: 10.3390/molecules21030366ISI: 000373802200117ScopusID: 2-s2.0-84963650366OAI: oai:DiVA.org:kth-187297DiVA: diva2:929637
Note

QC 20160519

Available from: 2016-05-19 Created: 2016-05-19 Last updated: 2016-06-08Bibliographically approved

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Stenström, PatrikAndrén, Oliver C. J.Malkoch, Michael
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