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Pincer Complex-Catalyzed Coupling Reactions via Palladium (IV) Intermediates
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för organisk kemi.
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för organisk kemi.
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för organisk kemi.
2009 (engelsk)Inngår i: Journal of the American Chemical Society, ISSN 0002-7863, E-ISSN 1520-5126, Vol. 11, nr 13, s. 2852-2854Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Palladium pincer complexes directly catalyze the redox coupling reactions of functionalized alkenes and iodonium salts. The catalytic process, which is suitable for mild catalytic functionalization of allylic acetates and electron-rich alkenes, probably occurs through Pd(IV) intermediates. Due to the strong metal−ligand interactions, the oxidation of phosphine and amine ligands of the pincer complexes can be avoided in the presented reactions.

sted, utgiver, år, opplag, sider
2009. Vol. 11, nr 13, s. 2852-2854
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-25756DOI: 10.1021/ol9010739OAI: oai:DiVA.org:su-25756DiVA, id: diva2:200432
Merknad
Part of urn:nbn:se:su:diva-8524Tilgjengelig fra: 2009-02-26 Laget: 2009-02-17 Sist oppdatert: 2017-12-13bibliografisk kontrollert
Inngår i avhandling
1. Novel Pincer Complex-Catalyzed Transformations: Including Asymmetric Catalysis
Åpne denne publikasjonen i ny fane eller vindu >>Novel Pincer Complex-Catalyzed Transformations: Including Asymmetric Catalysis
2009 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

This thesis is focused on the development of new pincer complex-catalyzed transformations. Optimization of the catalytic properties (fine-tuning) was directed to increase the catalytic activity as well as the chemo-, stereo- and enantioselectivity of the complexes. This was achieved by varying the heteroatoms in the terdentate pincer ligand, by changing the electronic properties of the coordinated aryl moiety and by implementing chiral functionalities in the pincer complexes.

In the cross-coupling reaction of vinyl epoxides and aziridines with organoboronic acids the chemoselectivity of the reaction could be increased by employment of pincer complexes instead of commonly used Pd(0) catalysts. Furthermore, the introduction of a methoxy substituent in the aromatic subunit of the complex considerably increased the activity of the pincer complex catalyst.

Fine-tuning of the enantioselectivity in electrophilic allylation reactions was achieved by using a wide variety of new BINOL- and biphenanthrol-based pincer complexes. The highest enantioselectivity (85% ee) was obtained by applying biphenanthrol-based pincer complexes.

Stereoselective pincer complex-catalyzed condensation of sulfonylimines with isocyanoacetate could be achieved under mild reaction conditions. By application of chiral PCP catalysts, 2-imidazolines could be obtained with up to 86% ee.

A new pincer complex-catalyzed C-H bond functionalization based reaction between organonitriles and sulfonylimines affords homoallylic amines and beta-aminonitriles in high yields. The asymmetric version of this process affords beta-aminonitriles with up to 71% ee.

In the last chapter, a pincer complex-catalyzed redox coupling reaction is described. In this highly regio- and stereoselective process the integrity of the pincer catalysts is fully retained. This catalytic reaction proceeds with a high level of functional group tolerance, as allylic acetate and aryl halide functionalities are retained.

sted, utgiver, år, opplag, sider
Stockholm: Institutionen för organisk kemi, 2009. s. 136
Emneord
pincer, palladium, catalysis, chiral, asymmetric, palladium IV, allylation, aldol, aminoacid, C-H functionalization, cross-coupling, homoallylic, heck reaction, tridentate ligand
HSV kategori
Forskningsprogram
organisk kemi
Identifikatorer
urn:nbn:se:su:diva-8524 (URN)978-91-7155-825-1 (ISBN)
Disputas
2009-03-20, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 12 A, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2009-02-26 Laget: 2009-02-17 Sist oppdatert: 2009-05-25bibliografisk kontrollert

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