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Theoretical study of asymmetric transfer hydrogenation of ketones catalyzed by amino acid derived rhodium complexes
Stockholm University, Faculty of Science, Department of Organic Chemistry.
Stockholm University, Faculty of Science, Department of Organic Chemistry.
Stockholm University, Faculty of Science, Department of Organic Chemistry.
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2012 (English)In: ChemCatChem, ISSN 1867-3880, E-ISSN 1867-3899, Vol. 4, no 8, 1095-1104 p.Article in journal (Refereed) Published
Abstract [en]

Density functional theory calculations are employed to study the asymmetric transfer hydrogenation of ketones catalyzed by rhodiumarene complexes containing hydroxamic acid-functionalized amino acid ligands. Firstly, the ligandmetal binding is investigated and it is shown that both the N,N and O,O binding modes Are viable. For each of these, the full free energy profile for the transfer hydrogenation is calculated according to the outer-sphere reaction mechanism. Three factors are demonstrated to influence the stereoselectivity of the process, namely the energy difference between the metalligand binding modes, the energy difference between the intermediate hydrogenated catalyst, and the existence of a stabilizing CHp interaction between the Cp* ligand of the catalyst and the phenyl moiety of the substrate. Theoretical reproduction of the selectivity of a slightly modified ligand that is shown experimentally to yield the opposite enantioselectivity corroborates these results. Finally, a technical observation made is that inclusion of dispersion interactions (using the B3LYP-D2 correction or the M06 functional) proved to be very important for reproducing the enantioselectivity.

Place, publisher, year, edition, pages
2012. Vol. 4, no 8, 1095-1104 p.
Keyword [en]
asymmetric catalysis, density functional calculations, rhodium, hydrogenation, transition states
National Category
Organic Chemistry
Identifiers
URN: urn:nbn:se:su:diva-81733DOI: 10.1002/cctc.201200045ISI: 000306907700011OAI: oai:DiVA.org:su-81733DiVA: diva2:563597
Funder
Swedish Research Council
Note

AuthorCount:5;

Available from: 2012-10-30 Created: 2012-10-30 Last updated: 2017-12-07Bibliographically approved

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