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Neue Phosphor-Pyridin-Liganden für die Iridium-katalysierte enantioselektive Hydrierung

Kaiser, Stefan. Neue Phosphor-Pyridin-Liganden für die Iridium-katalysierte enantioselektive Hydrierung. 2005, Doctoral Thesis, University of Basel, Faculty of Science.

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Official URL: http://edoc.unibas.ch/diss/DissB_7267

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Abstract

We herein report the synthesis and application of novel P,N-ligands derived form pyridine.
The modularity of the new ligands is reflected in their synthesis. Both ring size and
substitution pattern of the pyridine moiety are easily varied. The electronic properties of the
ligands are tunable in the phosphorus introduction step, by using either an aryl- or an
alkylphosphine (Figure 1).
In using this new ligand type in catalytic hydrogenation for a range of unfunctionalized
olefins, we observed excellent conversions and enantioselectivities. The results are
comparable, and in some cases even better, than those induced by chiral phosphinooxazolines
(Figure 2).
The scope of this catalyst type was extended to include the reduction of substituted furans and
benzofurans. For the first time, tetrahydrofuran- and dihydrobenzofuran-derivatives were
synthesized by an enantioselective hydrogenation reaction with selectivities of over 90% ee
(Figure 3).
Advisors:Pfaltz, Andreas
Committee Members:Woggon, Wolf-Dietrich
Faculties and Departments:05 Faculty of Science > Departement Chemie > Chemie > Synthetische organische Chemie (Pfaltz)
UniBasel Contributors:Pfaltz, Andreas and Woggon, Wolf-Dietrich
Item Type:Thesis
Thesis Subtype:Doctoral Thesis
Thesis no:7267
Thesis status:Complete
Bibsysno:Link to catalogue
Number of Pages:254
Language:German
Identification Number:
Last Modified:05 Apr 2018 17:32
Deposited On:13 Feb 2009 15:15

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