Acrylamide-Based Pd-Nanoparticle Carriers as Smart Catalysts for the Suzuki–Miyaura Cross-Coupling of Amino Acids

Author:

Sabadasch Viktor1,Dachwitz Steffen2,Hellweg Thomas13,Sewald Norbert2ORCID,Hannappel Yvonne1

Affiliation:

1. Department of Chemistry, Physical and Biophysical Chemistry, Bielefeld University

2. Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University

3. BINAS - Bielefeld Institute for Biophysics and Nanoscience, Bielefeld University

Abstract

AbstractPolyacrylamide-based waterborne microgels were prepared with copolymerized carboxylic acid and tertiary amine moieties. The colloidal gels were loaded with palladium nanoparticles and utilized for the Suzuki–Miyaura cross-coupling of amino acids and peptides. The thermoresponsive properties of the prepared microgels were characterized by means of photon correlation spectroscopy (PCS) at solvent conditions of the catalytic reaction. The localization and morphology of the incorporated nanoparticles were characterized with transmission electron microscopy (TEM). Palladium-catalyzed Suzuki–Miyaura cross-coupling of N α-Boc-4-iodophenylalanine and N α-Boc-7-bromotryptophan with phenylboronic acid was carried out under ambient atmosphere in water at 20, 37, and 60 °C, respectively. The properties of the thermoresponsive microgel showed a strong influence on the reactivity and selectivity towards the respective substrate. For the amine containing microgels, a recyclability for up to four cycles without loss in activity could be realized. Furthermore, the systems showed good catalytic activity regarding Suzuki–Miyaura cross-coupling of halogenated amino acids in selected tri- and tetrapeptides.

Funder

Deutsche Forschungsgemeinschaft

Publisher

Georg Thieme Verlag KG

Subject

Organic Chemistry,Catalysis

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