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Efficient 1,3-Oxazolidin-2-one Synthesis through Heterogeneous Pd-II-Catalyzed Intramolecular Hydroamination of Propargylic Carbamates
Stockholm University, Faculty of Science, Department of Organic Chemistry.ORCID iD: 0000-0001-9329-0091
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.ORCID iD: 0000-0001-8462-4176
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Number of Authors: 52019 (English)In: Chemistry - A European Journal, ISSN 0947-6539, E-ISSN 1521-3765, Vol. 25, no 25, p. 6295-6299Article in journal (Refereed) Published
Abstract [en]

Herein, we present an operationally simple protocol for the cycloisomerization of propargylic carbamates in which a heterogeneous catalyst consisting of Pd species immobilized on amino-functionalized siliceous mesocellular foam (Pd-II-AmP-MCF) is used. This Pd nanocatalyst displayed high efficiency at low catalyst loading and reaction temperatures, which allowed for the efficient and mild synthesis of a wide range of 1,3-oxazolidin-2-one derivatives and related compounds. Moreover, it proved possible to re-use the Pd nanocatalyst for several reactions, although a gradual decrease in activity was observed in the subsequent cycles.

Place, publisher, year, edition, pages
2019. Vol. 25, no 25, p. 6295-6299
Keywords [en]
cycloisomerization, heterogeneous catalysis, mesoporous silica, oxazolidinones, palladium
National Category
Organic Chemistry
Research subject
Organic Chemistry
Identifiers
URN: urn:nbn:se:su:diva-171163DOI: 10.1002/chem.201900678ISI: 000471033900007PubMedID: 30888694OAI: oai:DiVA.org:su-171163DiVA, id: diva2:1341255
Available from: 2019-08-08 Created: 2019-08-08 Last updated: 2022-02-26Bibliographically approved
In thesis
1. Palladium Catalysis in Directed C-H Bond Activation and Cycloisomerisation Reactions
Open this publication in new window or tab >>Palladium Catalysis in Directed C-H Bond Activation and Cycloisomerisation Reactions
2020 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The main focus of this thesis concerns the development of Pd(II)-catalysed synthetic methodologies for the preparation of biologically active compounds.

In the first part (paper I-III), unactivated C–H bonds of a cyclobutane derivative are selectively functionalised using a directing group starting from the feedstock compound verbenone (paper I). In the following part the development of an efficient transamidation protocol for the directing group removal is reported (paper II). Both procedures were then used in conjunction, for the synthesis of diverse C-3 arylated benzofuran-2-carboxylamides, in only 3 steps starting from benzofuran-2-carboxylic acid (paper III).

The second part (paper IV-V) aimed to evaluate the catalytic efficiency of the heterogeneous catalyst Pd(II)-AmP-MCF in the intramolecular hydroamination of propargylic carbamates. The catalyst was able to promote the formation of various 1,3-oxazolidin-2-ones in high yields, at room temperature with low palladium loadings (paper IV). This investigation is followed by a mechanistic study of the Pd(II)-AmP-MCF catalyst’s deactivation process during a lactone formation, using X-ray absorption spectroscopy (paper V).

Place, publisher, year, edition, pages
Stockholm: Department of Organic Chemistry, Stockholm University, 2020. p. 58
Keywords
Palladium(II), Catalysis, C-H Functionalisation, Transamidation, XAS
National Category
Organic Chemistry
Research subject
Organic Chemistry
Identifiers
urn:nbn:se:su:diva-180981 (URN)978-91-7911-170-0 (ISBN)978-91-7911-171-7 (ISBN)
Public defence
2020-06-05, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 16 B, Stockholm, 10:00 (English)
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Note

At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 5: Manuscript.

Available from: 2020-05-13 Created: 2020-04-23 Last updated: 2022-02-26Bibliographically approved

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Oschmann, MichaelNagendiran, AnujaBäckvall, Jan-E.Verho, Oscar

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