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Novel Applications of Benziodoxole Reagents in the Synthesis of Organofluorine Compounds
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för organisk kemi.
2017 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

This thesis concerns method development of new synthetic routes by applying electrophilic hypervalent iodine reagents, such as trifluoromethyl-benziodoxole (Togni reagent) and fluoro-benziodoxole. The first project involved the addition of an oxygen moiety and trifluoromethyl group across double and triple bonds (both groups derived from the hypervalent iodine reagent). We observed that electron donating substituents on the aromatic ring of the substrate accelerated the oxytrifluoromethylation reaction. This transformation was further expanded to halo-trifluoromethylation reaction of a vinyl silane substrate. We also developed a copper mediated cyanotrifluoromethylation reaction, which was accelerated by PCy3 additive. This transformation allowed for the creation of two new C-C bonds in a single addition reaction. The direct C-H trifluoromethylation reaction of quinones was achived using the Togni-reagent in the presence of B2pin2 additive. The intriguing additive effects of both B2pin2 and PCy3 inspired us to examine the mechanism of these transformations.

Fluoro-benziodoxole is the fluoroiodane analogue of the trifluoromethylating Togni reagent. We developed a AgBF4 mediated geminal difluorination of styrenes using this fluoroiodine reagent. In this process one fluorine atom came from the fluoroiodane, while the other fluorine was derived from the tetrafluoroborate ion. A similar approach was applied for the 1,3-oxyfluorination and difluorination of cyclopropanes. Similarly, this fluorinative ring opening of unactivated cyclopropanes involved the introduction of an electrophilic fluorine atom from the fluoroiodane reagent and a nucleophilic one from the tetrafluoroborate ion. This reaction was extended to synthesis of 1,3-oxyfluorinated products. When alkenes reacted with the fluoro-benziodoxole reagent in the presence of palladium catalyst the iodofluorination reaction occurred.  Both the iodine and fluorine atoms were derived from the fluoroiodane reagent. The iodofluorination reaction with disubstituted and cyclic alkenes proceeded with high regio- and stereoselectivity.

Ort, förlag, år, upplaga, sidor
Stockholm: Department of Organic Chemistry, Stockholm University , 2017. , s. 61
Nyckelord [en]
trifluoromethylation, hypervalent iodine, Togni reagent, difluorination, iodofluorination
Nationell ämneskategori
Organisk kemi
Forskningsämne
organisk kemi
Identifikatorer
URN: urn:nbn:se:su:diva-136207ISBN: 978-91-7649-618-3 (tryckt)ISBN: 978-91-7649-619-0 (tryckt)OAI: oai:DiVA.org:su-136207DiVA, id: diva2:1051237
Disputation
2017-02-10, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 16 B, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2017-01-18 Skapad: 2016-12-01 Senast uppdaterad: 2016-12-08Bibliografiskt granskad
Delarbeten
1. Electrophilic Trifluoromethylation by Copper-Catalyzed Addition of CF3-Transfer Reagents to Alkenes and Alkynes
Öppna denna publikation i ny flik eller fönster >>Electrophilic Trifluoromethylation by Copper-Catalyzed Addition of CF3-Transfer Reagents to Alkenes and Alkynes
2012 (Engelska)Ingår i: Organic Letters, ISSN 1523-7060, E-ISSN 1523-7052, Vol. 14, nr 11, s. 2882-2885Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Regio- and stereoselective Cu-catalyzed addition of the above hypervalent iodine reagent to alkynes and alkenes was achieved. In the presence of Cul, the reaction is suitable to perform trifluoromethyl-benzoyloxylation and trifluoromethyl-halogenation of alkenes and alkynes. Electron-donating substituents accelerate the process, and alkenes react faster than alkynes emphasizing the electrophilic character of the addition reaction.

Nationell ämneskategori
Organisk kemi
Forskningsämne
organisk kemi
Identifikatorer
urn:nbn:se:su:diva-79887 (URN)10.1021/ol3011419 (DOI)000304682700058 ()
Forskningsfinansiär
VetenskapsrådetKnut och Alice Wallenbergs Stiftelse
Anmärkning

AuthorCount:4;

Tillgänglig från: 2012-09-12 Skapad: 2012-09-11 Senast uppdaterad: 2017-12-07Bibliografiskt granskad
2. Copper-Mediated Cyanotrifluoromethylation of Styrenes Using the Togni Reagent
Öppna denna publikation i ny flik eller fönster >>Copper-Mediated Cyanotrifluoromethylation of Styrenes Using the Togni Reagent
2013 (Engelska)Ingår i: Journal of Organic Chemistry, ISSN 0022-3263, E-ISSN 1520-6904, Vol. 78, nr 21, s. 11087-11091Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Styrenes with an electron-deficient double bond undergo cyanotrifluoromethylation with a trifluoromethylated hypervalent iodine reagent in the presence of CuCN. The reaction proceeds under mild conditions in the presence of bulky phosphines or B(2)pin(2) additives. The process is highly regioselective and involves the consecutive formation of two C-C bonds in a single addition reaction. In the presence of a p-methoxy substituent in the styrene, oxytrifluoromethylation occurs instead of the cyanotrifluoromethylation.

Nationell ämneskategori
Organisk kemi
Forskningsämne
organisk kemi
Identifikatorer
urn:nbn:se:su:diva-97375 (URN)10.1021/jo401831t (DOI)000326615300056 ()
Forskningsfinansiär
VetenskapsrådetKnut och Alice Wallenbergs Stiftelse
Anmärkning

AuthorCount:3;

Tillgänglig från: 2013-12-09 Skapad: 2013-12-09 Senast uppdaterad: 2017-12-06Bibliografiskt granskad
3. Copper-mediated C-H trifluoromethylation of quinones
Öppna denna publikation i ny flik eller fönster >>Copper-mediated C-H trifluoromethylation of quinones
2013 (Engelska)Ingår i: Chemical Communications, ISSN 1359-7345, E-ISSN 1364-548X, Vol. 49, nr 59, s. 6614-6616Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Quinones undergo copper-mediated C-H trifluoromethylation reactions using a hypervalent iodine reagent. The reactions have a broad synthetic scope involving naphtho, alkyl, chloro and methoxy quinones.

Nationell ämneskategori
Organisk kemi
Forskningsämne
organisk kemi
Identifikatorer
urn:nbn:se:su:diva-92819 (URN)10.1039/c3cc43357a (DOI)000321012900012 ()
Anmärkning

AuthorCount:3;

Tillgänglig från: 2013-08-21 Skapad: 2013-08-20 Senast uppdaterad: 2017-12-06Bibliografiskt granskad
4. Effects of B(2)pin(2) and PCy3 on copper-catalyzed trifluoromethylation of substituted alkenes and alkynes with the Togni reagent
Öppna denna publikation i ny flik eller fönster >>Effects of B(2)pin(2) and PCy3 on copper-catalyzed trifluoromethylation of substituted alkenes and alkynes with the Togni reagent
2015 (Engelska)Ingår i: Tetrahedron, ISSN 0040-4020, E-ISSN 1464-5416, Vol. 71, nr 6, s. 922-931Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The copper-catalyzed oxytrifluoromethylation of phenylacetylenes and C-H trifluoromethylation of quinones were studied. It was found that both reactions are accelerated by B(2)pin(2) and PCy3 additives. The two reactions have different substituent effects. The oxytrifluoromethylation is faster in the presence of electron-donating groups, while the C-H trifluoromethylation is faster with electron-withdrawing substituents. The Hammett plot for oxytrifluoromethylation gave a rho value of 0.76 indicating electron demand in the rate determining step of the reaction. According to the absolute value of rho the reaction probably does not proceed through a rate determining formation of a carbocation intermediate. The kinetic isotope effect measurements indicate that in C-H trifluoromethylation of quinones the cleavage of the C-H bond is not the rate determining step of the reaction.

Nyckelord
Catalysis, Trifluoromethylation, Substituent effects, Hammett plot, Quinones
Nationell ämneskategori
Organisk kemi
Forskningsämne
organisk kemi
Identifikatorer
urn:nbn:se:su:diva-115277 (URN)10.1016/j.tet.2014.12.077 (DOI)000348950300003 ()
Forskningsfinansiär
VetenskapsrådetKnut och Alice Wallenbergs Stiftelse
Anmärkning

AuthorCount:4;

Tillgänglig från: 2015-03-31 Skapad: 2015-03-18 Senast uppdaterad: 2017-12-04Bibliografiskt granskad
5. Mild Silver-Mediated Geminal Difluorination of Styrenes Using an Air- and Moisture-Stable Fluoroiodane Reagent
Öppna denna publikation i ny flik eller fönster >>Mild Silver-Mediated Geminal Difluorination of Styrenes Using an Air- and Moisture-Stable Fluoroiodane Reagent
2014 (Engelska)Ingår i: Angewandte Chemie International Edition, ISSN 1433-7851, E-ISSN 1521-3773, Vol. 53, nr 47, s. 12897-12901Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

An air-and moisture-stable fluoroiodane in the presence of AgBF4 is suitable for selective geminal difluorination of styrenes under mild reaction conditions. One of the C-F bonds is formed by transfer of electrophilic fluorine from the hypervalent iodine reagent, while the other one arises from the tetrafluoroborate counterion of silver. Deuterium-isotope-labelling experiments and rearrangement of methyl styrene substrates suggest that the reaction proceeds through a phenonium ion intermediate.

Nyckelord
fluorine, hypervalent compounds, reaction mechanism, rearrangement, silver
Nationell ämneskategori
Organisk kemi
Forskningsämne
organisk kemi
Identifikatorer
urn:nbn:se:su:diva-121570 (URN)10.1002/anie.201408812 (DOI)000344793400041 ()
Forskningsfinansiär
Knut och Alice Wallenbergs StiftelseVetenskapsrådet
Tillgänglig från: 2015-10-09 Skapad: 2015-10-09 Senast uppdaterad: 2017-12-01Bibliografiskt granskad
6. Fluorinative ring-opening of cyclopropanes by hypervalent iodine reagents. An efficient method for 1,3-oxyfluorination and 1,3-difluorination
Öppna denna publikation i ny flik eller fönster >>Fluorinative ring-opening of cyclopropanes by hypervalent iodine reagents. An efficient method for 1,3-oxyfluorination and 1,3-difluorination
2017 (Engelska)Ingår i: Chemical Sience, ISSN 2041-6520, Vol. 8, nr 2, s. 1056-1061Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A new method is presented for 1,3-difluorination and 1,3-oxyfluorination reactions. The process is based on iodonium mediated opening of 1,1-disubstituted cyclopropanes. The reaction proceeds with high chemo- and regioselectivity under mild reaction conditions typically at room temperature in a couple of hours. The reaction probably occurs via electrophilic ring-opening of cyclopropanes.

Nationell ämneskategori
Organisk kemi
Forskningsämne
organisk kemi
Identifikatorer
urn:nbn:se:su:diva-136206 (URN)10.1039/c6sc03471c (DOI)000395428300023 ()
Tillgänglig från: 2016-12-01 Skapad: 2016-12-01 Senast uppdaterad: 2017-04-03Bibliografiskt granskad
7. Palladium-Catalyzed lodofluorination of Alkenes Using Fluorolodoxole Reagent
Öppna denna publikation i ny flik eller fönster >>Palladium-Catalyzed lodofluorination of Alkenes Using Fluorolodoxole Reagent
2016 (Engelska)Ingår i: ACS Catalysis, ISSN 2155-5435, E-ISSN 2155-5435, Vol. 6, nr 1, s. 447-450Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The application of an air- and moisture-stable fluoroiodane reagent was investigated in the palladium-catalyzed iodofluorination reaction of alkenes. Both the iodo and fluoro substituents arise from the fluoroiodane reagent. In the case of certain palladium catalysts, the alkene substrates undergo allylic rearrangement prior to the iodofluorination process. The reaction is faster for electron-rich alkenes than for electron-deficient ones.

Ort, förlag, år, upplaga, sidor
American Chemical Society (ACS), 2016
Nyckelord
fluorination, hypervalent iodines, iodofluorination, palladium catalysis, alkenes, difunctionalization
Nationell ämneskategori
Organisk kemi
Forskningsämne
organisk kemi
Identifikatorer
urn:nbn:se:su:diva-126379 (URN)10.1021/acscatal.5b02022 (DOI)000367706800049 ()
Forskningsfinansiär
VetenskapsrådetKnut och Alice Wallenbergs Stiftelse
Tillgänglig från: 2016-02-12 Skapad: 2016-02-01 Senast uppdaterad: 2019-05-08Bibliografiskt granskad

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