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López J, Velazco-Cabral I, Rodríguez-deLeón E, Villegas Gómez C, Delgado F, Tamariz J, Arrieta A, Cossío FP, Vázquez MA. Selective synthesis of trisubstituted pyrroles through the reactions of alkynyl Fischer carbene complexes with oxazolones. Org Biomol Chem 2020; 18:538-550. [DOI: 10.1039/c9ob02411e] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The unexpected reactivity of fluorinated oxazolones with alkynyl Fischer carbenes is reported. The loss of the –CF3 and a cascade process involving nucleophilic additions were observed.
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Affiliation(s)
- Julio López
- Departament of Chemistry
- University of Guanajuato
- 36050 Guanajuato, Gto
- Mexico
| | | | | | | | - Francisco Delgado
- Departament of Organic Chemistry
- National School of Biological Sciences-Instituto Politécnico Nacional
- Ciudad de Mexico
- Mexico
| | - Joaquín Tamariz
- Departament of Organic Chemistry
- National School of Biological Sciences-Instituto Politécnico Nacional
- Ciudad de Mexico
- Mexico
| | - Ana Arrieta
- Departament of Organic Chemistry I and Centro de Innovación en Química Avanzada (ORFEO-CINQA). Universidad del País Vasco/Euskal Herriko Unibertsitatea (UPV/EHU)
- 20018 San Sebastian/Donostia
- Spain
- Donostia International Physics Center (DIPC)
- 20018 San Sebastian/Donostia
| | - Fernando P. Cossío
- Departament of Organic Chemistry I and Centro de Innovación en Química Avanzada (ORFEO-CINQA). Universidad del País Vasco/Euskal Herriko Unibertsitatea (UPV/EHU)
- 20018 San Sebastian/Donostia
- Spain
- Donostia International Physics Center (DIPC)
- 20018 San Sebastian/Donostia
| | - Miguel A. Vázquez
- Departament of Chemistry
- University of Guanajuato
- 36050 Guanajuato, Gto
- Mexico
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2
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Khatri HR, Han C, Luong E, Pan X, Adam AT, Alshammari MD, Shao Y, Colby DA. Controlling the Cleavage of Carbon-Carbon Bonds To Generate α,α-Difluorobenzyl Carbanions for the Construction of Difluoromethylbenzenes. J Org Chem 2019; 84:11665-11675. [PMID: 31449418 PMCID: PMC8262649 DOI: 10.1021/acs.joc.9b01595] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Controlling the cleavage of carbon-carbon bonds during a chemical reaction is a substantial challenge; however, synthetic methods that accomplish this objective produce valuable and often unexplored reactivity. We have designed a mild process to generate α,α-difluorobenzyl carbanions in the presence of potassium carbonate by exploiting the cleavage of C-C bonds during the release of trifluoroacetate. The initiating reagent is potassium carbonate, which represents an improvement over existing protocols that require a strong base. Fragmentation studies across substituted arenes and heteroarenes were conducted along with computational analyses to elucidate reactivity trends. Furthermore, the mildly generated α,α-difluorobenzyl carbanions from electron-deficient aromatics and heteroaromatic rings can react with aldehydes to create derivatives of difluoromethylbenzenes, which are valuable synthetic targets.
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Affiliation(s)
- Hari R. Khatri
- Department of BioMolecular Sciences, University of Mississippi, University, Mississippi 38677, United States
| | - Changho Han
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, Indiana 47907, United States
| | - Erica Luong
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Xiaoliang Pan
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Amna T. Adam
- Department of BioMolecular Sciences, University of Mississippi, University, Mississippi 38677, United States
| | - Maali D. Alshammari
- Department of BioMolecular Sciences, University of Mississippi, University, Mississippi 38677, United States
| | - Yihan Shao
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - David A. Colby
- Department of BioMolecular Sciences, University of Mississippi, University, Mississippi 38677, United States
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3
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Zhu L, Le L, Yan M, Au CT, Qiu R, Kambe N. Carbon-Carbon Bond Formation of Trifluoroacetyl Amides with Grignard Reagents via C(O)-CF 3 Bond Cleavage. J Org Chem 2019; 84:5635-5644. [PMID: 30950272 DOI: 10.1021/acs.joc.9b00583] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The reaction of trifluoroacetyl amides with Grignard reagent for the substitution of CF3 group with various alkyl or aryl groups is described. A variety of aryl, quinolin-8-yl, and (hetero)alkyl functional groups as well as F, Cl, and Br atoms are well tolerated. These moisture-stable and easily available trifluoroacetyl amides can be conveniently obtained and used as new versatile precursors for isocyanates. The control experiments show that the reaction proceeds via an isocyanate intermediate and/or alkoxide/amide dual anionic intermediate.
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Affiliation(s)
- Longzhi Zhu
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering , Hunan University , Changsha 410082 , P. R. China
| | - Liyuan Le
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering , Hunan University , Changsha 410082 , P. R. China
| | - Mingpan Yan
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering , Hunan University , Changsha 410082 , P. R. China
| | - Chak-Tong Au
- College of Chemistry and Chemical Engineering , Hunan Institute of Engineering , Xiangtan 411104 , P. R. China
| | - Renhua Qiu
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering , Hunan University , Changsha 410082 , P. R. China
| | - Nobuaki Kambe
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering , Hunan University , Changsha 410082 , P. R. China.,Department of Applied Chemistry, Graduate School of Engineering , Osaka University , Suita , Osaka 565-0871 , Japan
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4
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Hazlitt RA, John JP, Tran QL, Colby DA. Optimized Synthesis of a Pentafluoro- gem-diol and Conversion to a CF2Br-Glucopyranose through Trifluoroacetate-Release and Halogenation. Tetrahedron Lett 2016; 57:1906-1908. [PMID: 27182091 DOI: 10.1016/j.tetlet.2016.03.064] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Pentafluoro-gem-diols are substrates that enable the synthesis of valuable difluoromethylene-containing organic molecules through the release of trifluoroacetate. Currently, only one synthetic strategy is available to assemble these important precursors. Herein, two new synthetic strategies to a complex pentafluoro-gem-diol are compared to the existing route, and an improved synthetic route has completed. Moreover, the first synthesis of a CF2Br-glucopyranose was finished by a tandem trifluoroacetate-release halogenation/cyclization protocol.
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Affiliation(s)
- Robert A Hazlitt
- Department of Chemistry, Purdue University, West Lafayette, Indiana, 47907, USA; Department of BioMolecular Sciences, University of Mississippi, Mississippi, 38677, USA
| | - Jinu P John
- Department of Chemistry, Purdue University, West Lafayette, Indiana, 47907, USA
| | - Que-Lynn Tran
- Department of BioMolecular Sciences, University of Mississippi, Mississippi, 38677, USA
| | - David A Colby
- Department of Chemistry, Purdue University, West Lafayette, Indiana, 47907, USA; Department of BioMolecular Sciences, University of Mississippi, Mississippi, 38677, USA
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5
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Mei H, Xie C, Aceña JL, Soloshonok VA, Röschenthaler GV, Han J. Recent Progress in the in situ Detrifluoroacetylative Generation of Fluoro Enolates and Their Reactions with Electrophiles. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500787] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Chen J, Guo YP, Sun MH, Fan GT, Zhou L. Bromoform reaction of tertiary amines with N,N-dibromosulfonamides or NBS/sulfonamides. Chem Commun (Camb) 2015; 50:12367-70. [PMID: 25187429 DOI: 10.1039/c4cc05578k] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new bromoform reaction of tertiary amines with N,N-dibromosulfonamides or NBS/sulfonamides has been developed. A series of amidines were prepared with moderate to good yields via a Csp(3)-Csp(3) bond cleavage.
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Affiliation(s)
- Jie Chen
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry & Materials Science, Northwest University, Xi'an 710069, P. R. China.
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Ponpandian T, Muthusubramanian S. Copper catalysed domino decarboxylative cross coupling-cyclisation reactions: synthesis of 2-arylindoles. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.06.023] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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8
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Gerfaud T, Wei HL, Neuville L, Zhu J. Unexpected C–C Bond Cleavage: Synthesis of 1,2,4-Oxadiazol-5-ones from Amidoximes with Pentafluorophenyl or Trifluoromethyl Anion Acting as Leaving Group. Org Lett 2011; 13:6172-5. [DOI: 10.1021/ol202554m] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Thibaud Gerfaud
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif-sur-Yvette Cedex, France, and Institut of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL-SB-ISIC-LSPN, CH-1015 Lausanne, Switzerland
| | - Hai-Long Wei
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif-sur-Yvette Cedex, France, and Institut of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL-SB-ISIC-LSPN, CH-1015 Lausanne, Switzerland
| | - Luc Neuville
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif-sur-Yvette Cedex, France, and Institut of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL-SB-ISIC-LSPN, CH-1015 Lausanne, Switzerland
| | - Jieping Zhu
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif-sur-Yvette Cedex, France, and Institut of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL-SB-ISIC-LSPN, CH-1015 Lausanne, Switzerland
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9
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Han C, Kim EH, Colby DA. Cleavage of carbon-carbon bonds through the mild release of trifluoroacetate: generation of α,α-difluoroenolates for aldol reactions. J Am Chem Soc 2011; 133:5802-5. [PMID: 21443226 DOI: 10.1021/ja202213f] [Citation(s) in RCA: 139] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The selective cleavage of carbon-carbon bonds is a significant challenge in synthetic chemistry, yet this strategy can be a powerful way to generate reactive intermediates. We have discovered that, through the facile release of trifluoroacetate which occurs by C-C bond scission, difluoroenolates can be generated under very mild reaction conditions. Unlike existing reactions, this method is not limited to a small group of fluorinated building blocks. We have applied this process to the aldol reaction to install difluoromethylene groups.
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Affiliation(s)
- Changho Han
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, Indiana 47907, United States
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Nakaike Y, Taba N, Itoh S, Tobe Y, Nishiwaki N, Ariga M. Nucleophilic Substitution Accompanying Carbon–Carbon Bond Cleavage Assisted by a Nitro Group. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2007. [DOI: 10.1246/bcsj.80.2413] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Jiménez O, Bosch MP, Guerrero A. A new, mild, and efficient synthesis of 2,2-difluoro-3-hydroxyacids through a selective haloform reaction. J Org Chem 2006; 70:10883-5. [PMID: 16356015 DOI: 10.1021/jo0518856] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text] Long-chain 2,2-difluoro-3-hydroxyacids have been synthesized in a new, straightforward manner by treatment of 4-hydroxy-1,1,1,3,3-pentafluoroalkyl ketones, easily obtained by reaction of pentafluoroenolate 2 with aldehydes and ketones, with base under mild conditions. The reaction sequence is marked by the selective cleavage of the CO-CF3 bond, as well as the absence of products arising from the alternative CO-CF2R bond cleavage. The process represents a convenient approach for the synthesis of 2,2-difluoro-3-hydroxyacids, as it is short, provides good to excellent yields under mild conditions, and uses hexafluoro-2-propanol, a very cheap reagent, as the fluorine source.
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Affiliation(s)
- O Jiménez
- Barcelona Science Parc, University of Barcelona, Josep Samitier 1-5, 08028-Barcelona, Spain
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