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C-C Coupling of Ketones with Methanol Catalyzed by a N-Heterocyclic Carbene-Phosphine Iridium Complex
Stockholm University, Faculty of Science, Department of Organic Chemistry.ORCID iD: 0000-0002-6053-8828
Stockholm University, Faculty of Science, Department of Organic Chemistry.
Stockholm University, Faculty of Science, Department of Organic Chemistry.
2015 (English)In: Chemistry - A European Journal, ISSN 0947-6539, E-ISSN 1521-3765, Vol. 21, 3576-3579 p.Article in journal (Refereed) Published
Abstract [en]

An N-heterocyclic carbene–phosphine iridium complex system was found to be a very efficient catalyst for the methylation of ketone via a hydrogen transfer reaction. Mild conditions together with low catalyst loading (1 mol %) were used for a tandem process which involves the dehydrogenation of methanol, CC bond formation with a ketone, and hydrogenation of the new generated double bond by iridium hydride to give the alkylated product. Using this iridium catalyst system, a number of branched ketones were synthesized with good to excellent conversions and yields.

Place, publisher, year, edition, pages
2015. Vol. 21, 3576-3579 p.
Keyword [en]
C[BOND]C coupling reactions, hydrogen transfer, iridium, ketones, methylation
National Category
Organic Chemistry
Research subject
Organic Chemistry
Identifiers
URN: urn:nbn:se:su:diva-119679DOI: 10.1002/chem.201405990ISI: 000350116200013OAI: oai:DiVA.org:su-119679DiVA: diva2:847683
Funder
Swedish Research CouncilStiftelsen Olle Engkvist ByggmästareKnut and Alice Wallenberg Foundation
Available from: 2015-08-21 Created: 2015-08-21 Last updated: 2017-12-04Bibliographically approved
In thesis
1. Hydrogenation, Transfer Hydrogenation and Hydrogen Transfer Reactions Catalyzed by Iridium Complexes
Open this publication in new window or tab >>Hydrogenation, Transfer Hydrogenation and Hydrogen Transfer Reactions Catalyzed by Iridium Complexes
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The work described in this thesis is focused on the development of new bidentate iridium complexes and their applications in the asymmetric reduction of olefins, ketones and imines. Three new types of iridium complexes were synthesized, which included pyridine derived chiral N,P-iridium complexes, achiral NHC complexes and chiral NHC-phosphine complexes. A study of their catalytic applications demonstrated a high efficiency of the N,P-iridium complexes for asymmetric hydrogenation of olefins, with good enantioselectivity. The carbene complexes were found to be very efficient hydrogen transfer mediators capable of abstracting hydrogen from alcohols and subsequently transfer it to other unsaturated bonds. This hydrogen transferring property of the carbene complexes was used in the development of C–C and C–N bond formation reactions via the hydrogen borrowing process. The complexes displayed high catalytic reactivity using 0.5–1.0 mol% of the catalyst and mild reaction conditions. Finally chiral carbene complexes were found to be activated by hydrogen gas. Their corresponding iridium hydride species were able to reduce ketones and imines with high efficiency and enantioselectivity without any additives, base or acid.

Place, publisher, year, edition, pages
Stockholm: Department of Organic Chemistry, Stockholm University, 2015. 69 p.
Keyword
Iridium catalyst, carbene, N, P - ligand, asymmetric hydrogenation, transfer hydrogenation, hydrogen transfer reaction, alkylation, olefin, ketone, amide
National Category
Organic Chemistry
Research subject
Organic Chemistry
Identifiers
urn:nbn:se:su:diva-119701 (URN)978-91-7649-255-0 (ISBN)
Public defence
2015-09-30, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 16 B, Stockholm, 10:15 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 5: Submitted. Paper 6: Manuscript.

 

Available from: 2015-09-08 Created: 2015-08-21 Last updated: 2015-09-08Bibliographically approved

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