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Room temperature, metal-free synthesis of diaryl ethers with use of diaryliodonium salts
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för organisk kemi.
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för organisk kemi.
2011 (engelsk)Inngår i: Organic Letters, ISSN 1523-7060, E-ISSN 1523-7052, Vol. 13, nr 6, s. 1552-1555Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A fast, high-yielding synthesis of diaryl ethers with use of mild and metal-free conditions has been developed. The scope includes bulky orthosubstituteddiaryl ethers, which are difficult to obtain by metal-catalyzed protocols. Halo-substituents, racemization-prone amino acid derivatives,and heteroaromatics are also tolerated. The methodology is expected to be of high utility in the synthesis of complex molecules and in thepharmaceutical industry.

sted, utgiver, år, opplag, sider
2011. Vol. 13, nr 6, s. 1552-1555
HSV kategori
Forskningsprogram
organisk kemi
Identifikatorer
URN: urn:nbn:se:su:diva-59890DOI: 10.1021/ol200265tISI: 000288148800074OAI: oai:DiVA.org:su-59890DiVA, id: diva2:431776
Forskningsfinansiär
Swedish Research Council, 621-2008-3709
Tilgjengelig fra: 2011-07-25 Laget: 2011-07-25 Sist oppdatert: 2017-12-08bibliografisk kontrollert
Inngår i avhandling
1. Development and Applications of Hypervalent Iodine Compounds: Powerful Arylation and Oxidation Reagents
Åpne denne publikasjonen i ny fane eller vindu >>Development and Applications of Hypervalent Iodine Compounds: Powerful Arylation and Oxidation Reagents
2012 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

The first part of this thesis describes the efficient synthesis of several hypervalent iodine(III) compounds. Electron-rich diaryliodonium salts have been synthesized in a one-pot procedure, employing mCPBA as the oxidant. Both symmetric and unsymmetric diaryliodonium tosylates can be isolated in high yields. An in situ anion exchange also enables the synthesis of previously unobtainable diaryliodonium triflates.

A large-scale protocol for the synthesis of a derivative of Koser’s reagent, that is an isolable intermediate in the diaryliodonium tosylate synthesis, is furthermore described. The large-scale synthesis is performed in neat TFE, which can be recovered and recycled. This is very desirable from an environmental point of view.

One of the few described syntheses of enantiopure diaryliodonium salts is discussed. Three different enantiopure diaryliodonium salts bearing electron-rich substituents are synthesized in moderate to high yields. The synthesis of these three salts shows the challenge in the preparation of electron-rich substituted unsymmetric salts.

The second part of the thesis describes the application of both symmetric and unsymmetric diaryliodonium salts in organic synthesis. A metal-free efficient and fast method for the synthesis of diaryl ethers from diaryliodonium salts has been developed. The substrate scope is wide as both the phenol and the diaryliodonium salt can be varied. Products such as halogenated ethers, ortho-substituted ethers and bulky ethers, that are difficult to obtain with metal-catalyzed procedures, are readily prepared. The mild protocol allows arylation of racemization-prone a-amino acid derivatives without loss of enantiomeric excess.

A chemoselectivity investigation was conducted, in which unsymmetric diaryliodonium salts were employed in the arylation of three different nucleophiles in order to understand the different factors that influence which aryl moiety that is transferred to the nucleophile.

sted, utgiver, år, opplag, sider
Stockholm: Department of Organic Chemistry, Stockholm University, 2012. s. 71
Emneord
hypervalent iodine compounds, diaryliodonium salts, oxidation, Koser's reagent, arylation, phenols, diaryl ethers, chemoselectivity
HSV kategori
Forskningsprogram
organisk kemi
Identifikatorer
urn:nbn:se:su:diva-75810 (URN)978-91-7447-505-0 (ISBN)
Disputas
2012-06-05, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 16 B, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Merknad

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Accepted. Paper 5: Submitted. Paper 6: Manuscript.

Tilgjengelig fra: 2012-05-10 Laget: 2012-04-27 Sist oppdatert: 2013-08-09bibliografisk kontrollert

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