Surface immobilized Cu-1,10-phenanthroline complexes with α-aminophosphonate groups in the 5-position as heterogenous catalysts for efficient atom-transfer radical cyclizations

Sarah E Maier; Osman Bunjaku; Elif Kaya; Michael Dyballa; Wolfgang Frey; Deven P Estes

doi:10.1039/d3dt01467c

Surface immobilized Cu-1,10-phenanthroline complexes with α-aminophosphonate groups in the 5-position as heterogenous catalysts for efficient atom-transfer radical cyclizations

Dalton Trans. 2023 Jun 20;52(24):8442-8448. doi: 10.1039/d3dt01467c.

Authors

Sarah E Maier¹, Osman Bunjaku¹, Elif Kaya¹, Michael Dyballa¹, Wolfgang Frey², Deven P Estes¹

Affiliations

¹ Institute of Technical Chemistry, Pfaffenwaldring 55, 70569, Stuttgart, Germany. deven.estes@itc.uni-stuttgart.de.
² Institute of Organic Chemistry, Pfaffenwaldring 55, 70569, Stuttgart, Germany.

PMID: 37272264
DOI: 10.1039/d3dt01467c

Abstract

Many Cu catalyzed ATRC reactions suffer from low catalyst activity and stability. We have synthesized five 1,10-phenanthroline ligands substituted in the 5-position with α-aminophosphonate groups, through which the corresponding Cu complexes can be immobilized on Al₂O₃. These catalysts show similar activity and higher selectivity than the homogenous catalysts while being recyclable.