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N-Trifluoromethylation of Nitrosoarenes with Sodium Triflinate
Stockholm University, Faculty of Science, Department of Organic Chemistry.ORCID iD: 0000-0001-6517-8879
Stockholm University, Faculty of Science, Department of Organic Chemistry.ORCID iD: 0000-0002-7826-9953
Stockholm University, Faculty of Science, Department of Organic Chemistry.ORCID iD: 0000-0002-7826-9953
2017 (English)In: Organic Letters, ISSN 1523-7060, E-ISSN 1523-7052, Vol. 19, no 9, p. 2374-2377Article in journal (Refereed) Published
Abstract [en]

A highly efficient N-trifluoromethylation of nitro-soarenes is reported. The inexpensive and convenient Langlois reagent (sodium triflinate) is employed as a Ch(3)-radical source in combination with a copper catalyst and an oxidant. N-Trifluoromethylated hychoxylamines are obtained in high yields within 1 h at room temperature. The addition of hydroquinone was found to be instrumental to prevent the formation of side products. The method is high-yielding is scalable, and displays a high functional group tolerance.

Place, publisher, year, edition, pages
2017. Vol. 19, no 9, p. 2374-2377
National Category
Organic Chemistry
Research subject
Organic Chemistry
Identifiers
URN: urn:nbn:se:su:diva-144846DOI: 10.1021/acs.orglett.7b00908ISI: 000401044500045PubMedID: 28402669OAI: oai:DiVA.org:su-144846DiVA, id: diva2:1119402
Funder
Swedish Research CouncilAvailable from: 2017-07-04 Created: 2017-07-04 Last updated: 2018-05-08Bibliographically approved
In thesis
1. Transformations of Nitrosoarenes and Alkynyl Enones: Selective Synthesis of Nitrogen-Containing Compounds
Open this publication in new window or tab >>Transformations of Nitrosoarenes and Alkynyl Enones: Selective Synthesis of Nitrogen-Containing Compounds
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The nitrogen atom plays a unique role in organic chemistry. It is abundantly found in organic materials and is responsible for the activity of many biologically relevant compounds. In this thesis, nitrosoarenes and keto- and pyridyl-substituted enynes are used as convenient starting materials for the selective synthesis of nitrogen-containing compounds.

Nitrosoarenes are versatile compounds that can undergo a broad range of reactions. The nature of the nitroso group is significantly different from that of related nitrogen-based functional groups and this can be used as an advantage in the development of new methodology. In the first part of this thesis, the para-selective halogenation of nitrosoarenes with copper(II) halides as halogenating reagents is explored. The one-pot transformation of the products to the corresponding nitroarenes and anilines is demonstrated. The use of nitrosoarenes for radical N-perfluoroalkylation is presented in the next chapters. N-Perfluoroalkylation is a relatively new field and only a limited number of reagents and substrates have been employed so far. In this thesis, the stable and convenient Langlois reagent was used to achieve selective N-trifluoromethylation of nitrosoarenes to obtain the corresponding hydroxylamines. Longer perfluoroalkyl chains were investigated as well, but the less stable products were defluorinated to form hydroxamic acid derivatives. These products could be reduced to yield perfluoroalkyl amides.

Keto- and pyridyl-substituted enynes are starting materials designed to undergo cyclization reactions in the presence of a metal catalyst and a nucleophile. This offers the possibility to obtain a variety of more complex molecular structures in a single step. In the second half of the thesis, the reaction between these starting materials and enamines is explored. A range of cyclopenta[c]furans were synthesized in good yields and with high diastereoselectivities from alkynyl enones and enamines with InBr3 as the catalyst. The enamines were formed in situ in a multicomponent reaction. Pyridyl-substituted enynes are the pyridine analogues of alkynyl enones and were found to form polycyclic indolizines in the reaction with cyclic enamines with AgOTf as a catalyst. Good yields and high to excellent diastereoselectivities were obtained. When the reaction was performed with in situ-generated enamines, different indolizine derivatives were obtained.

Place, publisher, year, edition, pages
Stockholm: Department of Organic Chemistry, Stockholm University, 2018. p. 72
Keywords
alkynyl enones, catalysis, copper, halogenation, heterocycles, nitrosoarenes, perfluoroalkylation, trifluoromethylation
National Category
Organic Chemistry
Research subject
Organic Chemistry
Identifiers
urn:nbn:se:su:diva-155542 (URN)978-91-7797-091-0 (ISBN)978-91-7797-092-7 (ISBN)
Public defence
2018-06-15, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 16 B, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3: Manuscript. Paper 5: Manuscript.

Available from: 2018-05-23 Created: 2018-04-25 Last updated: 2018-05-23Bibliographically approved

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