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Jesani MH, Schwarz M, Kim S, Evans FL, White A, Browning A, Abrams R, Clayden J. Selective Defluorination of Trifluoromethyl Substituents by Conformationally Induced Remote Substitution. Angew Chem Int Ed Engl 2024; 63:e202403477. [PMID: 38587304 DOI: 10.1002/anie.202403477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2024] [Revised: 03/28/2024] [Accepted: 04/02/2024] [Indexed: 04/09/2024]
Abstract
The selective reduction of an aromatic trifluoromethyl substituent to a difluoromethyl substituent may be achieved by base-promoted elimination to form a difluoro-p-quinomethide which is trapped by an intramolecular nucleophile. High yields are obtained when the nucleophilic trap entails the conformationally favoured cyclisation of an aminoisobutyric acid (Aib) derivative. The resulting cyclised difluoromethyl-substituted arylimidazolidinone products are readily converted to versatile difluoromethyl-substituted aldehydes by reduction and hydrolysis. Defluorination is successful on a range of benzenoid (both para and ortho CF3-substituted) and heterocyclic substrates. Double defluorination may likewise be achieved sequentially, or in a single step, from an Aib dipeptide derivative.
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Affiliation(s)
- Mehul H Jesani
- School of Chemistry, University of Bristol Cantock's Close, Bristol, BS8 1TS, UK
| | - Maria Schwarz
- School of Chemistry, University of Bristol Cantock's Close, Bristol, BS8 1TS, UK
| | - Shiwhu Kim
- School of Chemistry, University of Bristol Cantock's Close, Bristol, BS8 1TS, UK
| | - Finlay L Evans
- School of Chemistry, University of Bristol Cantock's Close, Bristol, BS8 1TS, UK
| | - Alexander White
- School of Chemistry, University of Bristol Cantock's Close, Bristol, BS8 1TS, UK
| | - Alex Browning
- School of Chemistry, University of Bristol Cantock's Close, Bristol, BS8 1TS, UK
| | - Roman Abrams
- School of Chemistry, University of Bristol Cantock's Close, Bristol, BS8 1TS, UK
| | - Jonathan Clayden
- School of Chemistry, University of Bristol Cantock's Close, Bristol, BS8 1TS, UK
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2
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Abstract
The copper(II) trifluoromethanesulfonate-catalyzed Pummerer reaction of β-ketosulfoxides with 1,3-dicarbonyl compounds or π-nucleophiles such as phenols, arenes, and tetraallylsilane is reported. The mild conditions provide an efficient entry to a novel class of polysubstituted 3-alkylthiofuran and polysubstituted 3-thiobenzofuran heterocycles from readily available materials.
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Affiliation(s)
- Regev Parnes
- Department of Chemistry, Ben-Gurion University of the Negev , Beer-Sheva 84105, Israel
| | - Hagai Reiss
- Department of Chemistry, Ben-Gurion University of the Negev , Beer-Sheva 84105, Israel
| | - Doron Pappo
- Department of Chemistry, Ben-Gurion University of the Negev , Beer-Sheva 84105, Israel
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3
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Cao Y, Yuan JS, Zhou X, Wang XY, Zhuang FD, Wang JY, Pei J. N-Fused BDOPV: a tetralactam derivative as a building block for polymer field-effect transistors. Chem Commun (Camb) 2015; 51:10514-6. [PMID: 26037890 DOI: 10.1039/c5cc02026c] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An N-fused BDOPV derivative, NBDOPV, was designed and synthesized. The photophysical and electrochemical properties of NBDOPV were systematically investigated. The NBDOPV-based conjugated polymer PITET shows a large hole mobility of 1.92 cm(2) V(-1) s(-1).
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Affiliation(s)
- Yue Cao
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Center of Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing, China.
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4
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Parnes R, Pappo D. Reductive Alkylation of Arenes by a Thiol-Based Multicomponent Reaction. Org Lett 2015; 17:2924-7. [DOI: 10.1021/acs.orglett.5b01142] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Regev Parnes
- Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
| | - Doron Pappo
- Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
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5
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Parnes R, Narute S, Pappo D. Thiol-promoted selective addition of ketones to aldehydes. Org Lett 2014; 16:5922-5. [PMID: 25376009 DOI: 10.1021/ol502937n] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
A simple and efficient thiol-mediated addition of ketones to aromatic and aliphatic aldehydes is reported. This thermodynamically controlled Pummerer/aldol reaction, which can tolerate both moisture and protic functional groups, provides a direct entry to syn-β-thioketones in high chemo- and regioselectivity. Mechanistic studies revealed that selective transformation of the aldehyde to an electrophilic thionium ion species concurrent with the generation of a nucleophilic vinyl sulfide coupling partner from the ketone is imposing cross-coupling over dimerization.
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Affiliation(s)
- Regev Parnes
- Department of Chemistry, Ben-Gurion University of the Negev , Beer-Sheva 84105, Israel
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6
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Levick MT, Grace I, Dai SY, Kasch N, Muryn C, Lambert C, Turner ML, Procter DJ. A Sm(II)-Mediated Cascade Approach to Dibenzoindolo[3,2-b]carbazoles: Synthesis and Evaluation. Org Lett 2014; 16:2292-5. [DOI: 10.1021/ol500841b] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Matthew T. Levick
- School
of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, U.K
| | - Iain Grace
- Department
of Physics, Lancaster University, Lancaster, LA1 4YB, U.K
| | - Sheng-Yao Dai
- School
of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, U.K
| | - Nicholas Kasch
- School
of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, U.K
| | - Christopher Muryn
- School
of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, U.K
| | - Colin Lambert
- Department
of Physics, Lancaster University, Lancaster, LA1 4YB, U.K
| | - Michael L. Turner
- School
of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, U.K
| | - David J. Procter
- School
of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, U.K
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Rumer JW, Levick M, Dai SY, Rossbauer S, Huang Z, Biniek L, Anthopoulos TD, Durrant JR, Procter DJ, McCulloch I. BPTs: thiophene-flanked benzodipyrrolidone conjugated polymers for ambipolar organic transistors. Chem Commun (Camb) 2013; 49:4465-7. [DOI: 10.1039/c3cc40811f] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Levick MT, Coote SC, Grace I, Lambert C, Turner ML, Procter DJ. Phase Tag-Assisted Synthesis of Benzo[b]carbazole End-Capped Oligothiophenes. Org Lett 2012; 14:5744-7. [DOI: 10.1021/ol302748h] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Matthew T. Levick
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, U.K., and Department of Physics, Lancaster University, Lancaster, LA1 4YB, U.K
| | - Susannah C. Coote
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, U.K., and Department of Physics, Lancaster University, Lancaster, LA1 4YB, U.K
| | - Iain Grace
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, U.K., and Department of Physics, Lancaster University, Lancaster, LA1 4YB, U.K
| | - Colin Lambert
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, U.K., and Department of Physics, Lancaster University, Lancaster, LA1 4YB, U.K
| | - Michael L. Turner
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, U.K., and Department of Physics, Lancaster University, Lancaster, LA1 4YB, U.K
| | - David J. Procter
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, U.K., and Department of Physics, Lancaster University, Lancaster, LA1 4YB, U.K
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Coote SC, Quenum S, Procter DJ. Exploiting Sm(ii) and Sm(iii) in SmI2-initiated reaction cascades: application in a tag removal–cyclisation approach to spirooxindole scaffolds. Org Biomol Chem 2011; 9:5104-8. [DOI: 10.1039/c1ob05710c] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Smith LHS, Nguyen TT, Sneddon HF, Procter DJ. Synthesis of the ABH rings of ecteinascidin 597 using a connective Pummerer-type cyclisation. Chem Commun (Camb) 2011; 47:10821-3. [DOI: 10.1039/c1cc13992d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Smith L, Coote S, Sneddon H, Procter D. Jenseits der Pummerer-Reaktion: Entwicklungen in der Chemie der Thioniumionen. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201000517] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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12
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Smith L, Coote S, Sneddon H, Procter D. Beyond the Pummerer Reaction: Recent Developments in Thionium Ion Chemistry. Angew Chem Int Ed Engl 2010; 49:5832-44. [DOI: 10.1002/anie.201000517] [Citation(s) in RCA: 263] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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