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Palladium(II)-Catalyzed Decarboxylative Heck Arylations of Acyclic Electron-Rich Olefins with Internal Selectivity
Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Farmaceutiska fakulteten, Institutionen för läkemedelskemi, Avdelningen för organisk farmaceutisk kemi.
Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Farmaceutiska fakulteten, Institutionen för läkemedelskemi, Avdelningen för organisk farmaceutisk kemi. (Nanoteknologi och funktionella material)
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - BMC, Analytisk kemi.
Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Farmaceutiska fakulteten, Institutionen för läkemedelskemi, Avdelningen för organisk farmaceutisk kemi.
2014 (Engelska)Ingår i: Advanced Synthesis and Catalysis, ISSN 1615-4150, E-ISSN 1615-4169, Vol. 356, nr 4, s. 870-878Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Despite the recent emergence of decarboxylative CC bond forming reactions, methodologies providing internally arylated electron-rich olefins are still lacking. We herein report on palladium(II)-catalyzed decarboxylative Heck arylations of linear electron-rich olefins with excellent selectivity for the internal position. The method allows a variety of electron-rich linear olefins to undergo arylation with ortho-functionalized aromatic carboxylic acids, including heterocycles. The reaction mechanism has been explored with ESI-MS studies to confirm previous findings, and to reveal the formation of a highly stable palladium complex as a result of the Heck product reacting with the catalyst.

Ort, förlag, år, upplaga, sidor
2014. Vol. 356, nr 4, s. 870-878
Nationell ämneskategori
Nanoteknik
Forskningsämne
Teknisk fysik med inriktning mot nanoteknologi och funktionella material
Identifikatorer
URN: urn:nbn:se:uu:diva-234902DOI: 10.1002/adsc.201301004ISI: 000332929000028OAI: oai:DiVA.org:uu-234902DiVA, id: diva2:758255
Forskningsfinansiär
VetenskapsrådetKnut och Alice Wallenbergs StiftelseTillgänglig från: 2014-10-25 Skapad: 2014-10-25 Senast uppdaterad: 2017-12-05Bibliografiskt granskad
Ingår i avhandling
1. Palladium(II)-Catalyzed Heck Reactions: Domino Reactions, Decarboxylations, Mechanistic Studies & Continuous Flow Applications
Öppna denna publikation i ny flik eller fönster >>Palladium(II)-Catalyzed Heck Reactions: Domino Reactions, Decarboxylations, Mechanistic Studies & Continuous Flow Applications
2015 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

This thesis describes research efforts dedicated to the development of palladium(II)-catalyzed oxidative Heck and Heck/Suzuki domino reactions, and the applications of a new microwave heating technology, purpose-built for continuous flow in organic synthesis.

Paper I describes the development of a ligand-modulated approach for attaching aryl groups to a chelating vinyl ether. By switching the ligand being used, selectivity for the arylation could be shifted to obtain three different outcomes: internal α- or terminal β-arylation, as well as a serendipitously discovered domino α,β-diarylation process. The latter was proposed to be an effect of para-benzoquinone, effectively acting as a stabilizing π-acidic ligand with the ability to suppress β-hydride elimination.

Paper II explores the performance of a new microwave heating technology in combination with continuous flow. The novel nonresonant microwave applicator allowed rapid heating of common laboratory solvents and reaction mixtures above their boiling points with stable and reproducible temperature profiles. The technology was successfully applied to small-scale method development and subsequent scale-out of palladium-catalyzed reactions, heterocycle synthesis and classical organic transformations such as the Fischer indole synthesis.

Paper III focuses on developing regioselective oxidative decarboxylative Heck reactions with electron-rich olefins. Successful internal α-arylations were achieved using various olefins and ortho-substituted aromatic acids. The mechanism was also studied by ESI-MS analysis. Key cationic organopalladium intermediates were identified, as well as an unexpected palladium(II)-complex which was isolated and characterized. Its experimentally deduced structure was in accordance with the lowest energy minimum found by DFT calculations. Preliminary findings suggested that the complex acts as a catalyst trap.

Paper IV studies the mechanism of the reaction in Paper III by means of DFT calculations. Reductive elimination was identified as the rate-determining step when using a linear enamide as the olefin, due to its propensity to form low energy chelates. Its chelating properties also played a key role in the stability of the isolated palladium(II)-complex. The complex, which can act as a catalyst trap, was characterized by X-ray crystallography.

Ort, förlag, år, upplaga, sidor
Uppsala: Acta Universitatis Upsaliensis, 2015. s. 78
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Pharmacy, ISSN 1651-6192 ; 194
Nyckelord
palladium(II), dft, reaction mechanisms, esi-ms, heck, decarboxylation, microwave, continuous flow
Nationell ämneskategori
Organisk kemi
Identifikatorer
urn:nbn:se:uu:diva-242259 (URN)978-91-554-9149-9 (ISBN)
Disputation
2015-03-13, B41, Uppsala Biomedical Centre (BMC), Husargatan 3, Uppsala, 09:15 (Engelska)
Opponent
Handledare
Tillgänglig från: 2015-02-19 Skapad: 2015-01-22 Senast uppdaterad: 2015-03-11

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