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Highly Enantioselective Iridium Catalyzed Hydrogenation of α, β-Unsaturated Esters
Uppsala University, Sweden.
Uppsala University, Sweden.ORCID-id: 0000-0002-6053-8828
Uppsala University, Sweden; University Of KwaZulu-Natal, South Africa.ORCID-id: 0000-0002-1383-8246
2012 (engelsk)Inngår i: Chemistry - A European Journal, ISSN 0947-6539, E-ISSN 1521-3765, Vol. 18, nr 34, s. 10609-10616Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

α,β-Unsaturated esters have been employed as substrates in iridium-catalyzed asymmetric hydrogenation. Full conversions and good to excellent enantioselectivities (up to 99 % ee) were obtained for a broad range of substrates with both aromatic- and aliphatic substituents on the prochiral carbon. The hydrogenated products are highly useful as building blocks in the synthesis of a variety of natural products and pharmaceuticals.

sted, utgiver, år, opplag, sider
2012. Vol. 18, nr 34, s. 10609-10616
Emneord [en]
asymmetric catalysis, chirality, hydrogenation, iridium, α, β-unsaturated esters
HSV kategori
Forskningsprogram
organisk kemi
Identifikatorer
URN: urn:nbn:se:su:diva-119677DOI: 10.1002/chem.201200907OAI: oai:DiVA.org:su-119677DiVA, id: diva2:847681
Tilgjengelig fra: 2015-08-21 Laget: 2015-08-21 Sist oppdatert: 2019-12-04bibliografisk kontrollert
Inngår i avhandling
1. Hydrogenation, Transfer Hydrogenation and Hydrogen Transfer Reactions Catalyzed by Iridium Complexes
Åpne denne publikasjonen i ny fane eller vindu >>Hydrogenation, Transfer Hydrogenation and Hydrogen Transfer Reactions Catalyzed by Iridium Complexes
2015 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
Stockholm: Department of Organic Chemistry, Stockholm University, 2015. s. 69
Emneord
Iridium catalyst, carbene, N, P - ligand, asymmetric hydrogenation, transfer hydrogenation, hydrogen transfer reaction, alkylation, olefin, ketone, amide
HSV kategori
Forskningsprogram
organisk kemi
Identifikatorer
urn:nbn:se:su:diva-119701 (URN)978-91-7649-255-0 (ISBN)
Disputas
2015-09-30, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 16 B, Stockholm, 10:15 (engelsk)
Opponent
Veileder
Merknad

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 5: Submitted.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

 

Tilgjengelig fra: 2015-09-08 Laget: 2015-08-21 Sist oppdatert: 2015-09-08bibliografisk kontrollert

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