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Synthesis of Elaborate Benzofuran-2-Carboxamide Derivatives through a Combination of 8-Aminoquinoline Directed C–H Arylation and Transamidation Chemistry
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.
2020 (English)In: Molecules, ISSN 1431-5157, E-ISSN 1420-3049, Vol. 25, no 2, article id 361Article in journal (Refereed) Published
Abstract [en]

Herein, we present a short and highly modular synthetic route that involves 8-aminoquinoline directed C–H arylation and transamidation chemistry, and which enables access to a wide range of elaborate benzofuran-2-carboxamides. For the directed C–H arylation reactions, Pd catalysis was used to install a wide range of aryl and heteroaryl substituents at the C3 position of the benzofuran scaffold in high efficiency. Directing group cleavage and further diversification of the C3-arylated benzofuran products were then achieved in a single synthetic operation through the utilization of a one-pot, two-step transamidation procedure, which proceeded via the intermediate N-acyl-Boc-carbamates. Given the high efficiency and modularity of this synthetic strategy, it constitutes a very attractive method for generating structurally diverse collections of benzofuran derivatives for small molecule screening campaigns.

Place, publisher, year, edition, pages
2020. Vol. 25, no 2, article id 361
Keywords [en]
palladium, C–H functionalization, 8-aminoquinoline, benzofuran, transamidation
National Category
Organic Chemistry
Research subject
Organic Chemistry
Identifiers
URN: urn:nbn:se:su:diva-180978DOI: 10.3390/molecules25020361ISI: 000515381800123OAI: oai:DiVA.org:su-180978DiVA, id: diva2:1425813
Available from: 2020-04-22 Created: 2020-04-22 Last updated: 2023-08-28Bibliographically 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)
Opponent
Supervisors
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, MichaelPourghasemi-Lati, MonirehVerho, Oscar

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