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Covalent anchoring of a racemization catalyst to CALB-beads: towards dual immobilization of DKR catalysts
Stockholm University, Faculty of Science, Department of Organic Chemistry.
Stockholm University, Faculty of Science, Department of Organic Chemistry.
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2011 (English)In: Tetrahedron Letters, ISSN 0040-4039, E-ISSN 1359-8562, Vol. 52, no 14, 1601-1604 p.Article in journal (Refereed) Published
Abstract [en]

The preparation of a heterogeneous bifunctional catalytic system, combining the catalytic properties of an organometallic catalyst (racemization) with those of an enzyme (enantioselective acylation) is described. A novel ruthenium phosphonate inhibitor was synthesized and covalently anchored to a lipase immobilized on a solid support (CALB, Novozym® 435). The immobilized bifunctional catalytic system showed activity in both racemization of (S)-1-phenylethanol and selective acylation of 1-phenylethanol.

Place, publisher, year, edition, pages
2011. Vol. 52, no 14, 1601-1604 p.
Keyword [en]
Bifunctional catalytic system, Metalloenzyme, DKR, Lipases, Heterogeneous catalysis
National Category
Organic Chemistry
Identifiers
URN: urn:nbn:se:su:diva-56949DOI: 10.1016/j.tetlet.2011.01.106ISI: 000288730900014OAI: oai:DiVA.org:su-56949DiVA: diva2:414088
Funder
Swedish Research Council
Available from: 2011-05-02 Created: 2011-05-02 Last updated: 2017-12-11Bibliographically approved
In thesis
1. Asymmetric transformation of ß- and γ-functionalized alcohols: Study of combined ruthenium-catalyzed racemization and enzymatic resolution
Open this publication in new window or tab >>Asymmetric transformation of ß- and γ-functionalized alcohols: Study of combined ruthenium-catalyzed racemization and enzymatic resolution
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The major part of this thesis describes the asymmetric synthesis of β- and γ-amino alcohols through the combination of ruthenium catalyzed racemization and enzymatic kinetic resolution.

The dynamic kinetic resolution, DKR, protocol for chlorohydrins was improved by employing Bäckvall’s catalyst, which is a base activated racemization catalyst, in combination with Burkholderia cepacia lipase. These optimized conditions broadened the substrate scope and improved the yields and ee’s of the obtained chlorohydrin acetates. The utility of the method was demonstrated in the synthesis of (S)-salbutamol.

In the second part of the thesis, DKR was utilized in the enantio-determining step of the total synthesis of (R)-duloxetine. Optimized DKR conditions, combining Bäckvall’s catalyst together with Candida antarctica lipase B, afforded a β-cyano acetate in high yield and ee. (R)-Duloxetine was accessible through synthetic alterations of the enantioenriched β-cyano acetate in high overall yield.

A dynamic kinetic asymmetric transformation, DYKAT, protocol to obtain enantio- and diastereomerically pure γ-amino alcohols was developed. In a first step N-Boc-aminoketones were obtained in high enantiomeric purity through a proline-catalyzed Mannich reaction. Subsequent in situ reduction coupled with a highly efficient DYKAT yielded γ-amino acetates in high dr and ee. The γ-amino alcohols were available through simple hydrolysis/deprotection with retained stereochemistry.

In the final part of the thesis a heterogeneous bifunctional catalytic system is reported, which combines the catalytic properties of transition metal-catalyzed racemization with enzymatic acylation. A novel ruthenium-phosphonate complex was synthesized and then covalently anchored to the active site of solid supported Candida antarctica lipase B. The partially inhibited beads proved to be catalytically active both in racemization as well as enzymatic acylation.

Place, publisher, year, edition, pages
Stockholm: Department of Organic Chemistry, Stockholm University, 2011. 91 p.
Keyword
Kinetic resolution, dynamic kinetic resolution, kinetic asymmetric transformation, dynamic kinetic asymmetric transformation, enzyme catalysis, racemization, asymmetric synthesis, chlorohydrin, cyano acetate, amino alcohol, metalloenzyme, bifunctional catalytic system
National Category
Organic Chemistry
Research subject
Organic Chemistry
Identifiers
urn:nbn:se:su:diva-56947 (URN)978-91-7447-307-0 (ISBN)
Public defence
2011-06-10, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 16 B, Stockholm, 14:00 (English)
Opponent
Supervisors
Note
At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: In press. Paper 3: Epub ahead of print.Available from: 2011-05-13 Created: 2011-05-02 Last updated: 2011-06-15Bibliographically approved

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