201
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Affiliation(s)
- L. Reginald Mills
- Davenport Research Laboratories; Department of Chemistry; University of Toronto; 80 St George Street M5S 3H6 Toronto, Ontario Canada
| | - Sophie A. L. Rousseaux
- Davenport Research Laboratories; Department of Chemistry; University of Toronto; 80 St George Street M5S 3H6 Toronto, Ontario Canada
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202
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Saito R, Uemura N, Ishikawa H, Magara A, Yoshida Y, Mino T, Kasashima Y, Sakamoto M. Umpolung cyclization reaction of N-cinnamoylthioureas in the presence of DBU. Org Biomol Chem 2018; 16:7910-7919. [PMID: 30310909 DOI: 10.1039/c8ob02066c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel regioselective cyclization reaction of N-cinnamoylthioureas leading to six- or five-membered heterocyclic compounds was developed. N-Cinnamoylthioureas in the presence of trifluoroacetic acid (TFA) underwent the well-established intramolecular cycloaddition reaction to give 2-imino-2,3,5,6-tetrahydro-4H-1,3-thiazin-4-ones in good yields. On the other hand, the reaction with 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) proceeded in an unprecedented "umpolung" cyclization fashion to afford five-membered 2-imino-1,3-thiazolidin-4-ones and/or 2-thioxoimidazolidine-4-ones. The reaction was considered to occur via a cycloadduct of DBU with the cinnamoyl moiety followed by intramolecular attack of the thiourea group.
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Affiliation(s)
- Rei Saito
- Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University, Yayoi-cho, Inage-ku, Chiba, 263-8522 Japan.
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203
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Patra A, James A, Das TK, Biju AT. Oxidative NHC Catalysis for the Generation of Imidoyl Azoliums: Synthesis of Benzoxazoles. J Org Chem 2018; 83:14820-14826. [DOI: 10.1021/acs.joc.8b02598] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Atanu Patra
- Organic Chemistry Division, CSIR-National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune 411008, India
| | - Anjima James
- Organic Chemistry Division, CSIR-National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune 411008, India
| | - Tamal Kanti Das
- Organic Chemistry Division, CSIR-National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune 411008, India
| | - Akkattu T. Biju
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560012, India
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204
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You ZH, Chen YH, Tang Y, Liu YK. Organocatalytic Asymmetric Synthesis of Spiro-Bridged and Spiro-Fused Heterocyclic Compounds Containing Chromane, Indole, and Oxindole Moieties. Org Lett 2018; 20:6682-6686. [PMID: 30354166 DOI: 10.1021/acs.orglett.8b02731] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Following the reactivity inversion strategy, two different two-step sequences were designed and successfully applied to the asymmetric synthesis of spiro-bridged and spiro-fused heterocyclic compounds, which combined chromane, indole, and oxindole, three potential pharmacophores, in one molecule. The power of these two organocatalytic pathways is underscored by mild reaction conditions and high efficiency in the production of synthetically challenging, but biologically important heterocyclic products, which could be transformed into more biologically interesting heterocyclic structures.
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Affiliation(s)
- Zhi-Hao You
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy , Ocean University of China , Qingdao 266003 , China
| | - Ying-Han Chen
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy , Ocean University of China , Qingdao 266003 , China
| | - Yu Tang
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy , Ocean University of China , Qingdao 266003 , China.,Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology , Qingdao 266003 , China
| | - Yan-Kai Liu
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy , Ocean University of China , Qingdao 266003 , China.,Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology , Qingdao 266003 , China
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205
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Jentsch NG, Hume JD, Crull EB, Beauti SM, Pham AH, Pigza JA, Kessl JJ, Donahue MG. Quinolines from the cyclocondensation of isatoic anhydride with ethyl acetoacetate: preparation of ethyl 4-hydroxy-2-methylquinoline-3-carboxylate and derivatives. Beilstein J Org Chem 2018; 14:2529-2536. [PMID: 30344776 PMCID: PMC6178280 DOI: 10.3762/bjoc.14.229] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2018] [Accepted: 09/04/2018] [Indexed: 01/25/2023] Open
Abstract
A convenient two-step synthesis of ethyl 4-hydroxy-2-methylquinoline-3-carboxylate derivatives has been developed starting from commercially available 2-aminobenzoic acids. In step 1, the anthranilic acids are smoothly converted to isatoic anhydrides using solid triphosgene in THF. In step 2, the anhydride electrophiles are reacted with the sodium enolate of ethyl acetoacetate, generated from sodium hydroxide, in warm N,N-dimethylacetamide resulting in the formation of substituted quinolines. A degradation-build-up strategy of the ethyl ester at the 3-position allowed for the construction of the α-hydroxyacetic acid residue required for the synthesis of key arylquinolines involved in an HIV integrase project.
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Affiliation(s)
- Nicholas G Jentsch
- Department of Chemistry and Biochemistry, University of Southern Mississippi, 118 College Drive #5043, Hattiesburg, MS 39406, USA
| | - Jared D Hume
- Department of Chemistry and Biochemistry, University of Southern Mississippi, 118 College Drive #5043, Hattiesburg, MS 39406, USA
| | - Emily B Crull
- Department of Chemistry and Biochemistry, University of Southern Mississippi, 118 College Drive #5043, Hattiesburg, MS 39406, USA
| | - Samer M Beauti
- Department of Chemistry and Biochemistry, University of Southern Mississippi, 118 College Drive #5043, Hattiesburg, MS 39406, USA
| | - Amy H Pham
- Department of Chemistry and Biochemistry, University of Southern Mississippi, 118 College Drive #5043, Hattiesburg, MS 39406, USA
| | - Julie A Pigza
- Department of Chemistry and Biochemistry, University of Southern Mississippi, 118 College Drive #5043, Hattiesburg, MS 39406, USA
| | - Jacques J Kessl
- Department of Chemistry and Biochemistry, University of Southern Mississippi, 118 College Drive #5043, Hattiesburg, MS 39406, USA
| | - Matthew G Donahue
- Department of Chemistry and Biochemistry, University of Southern Mississippi, 118 College Drive #5043, Hattiesburg, MS 39406, USA
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206
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McDonald BR, Scheidt KA. Intermolecular Reductive Couplings of Arylidene Malonates via Lewis Acid/Photoredox Cooperative Catalysis. Org Lett 2018; 20:6877-6881. [PMID: 30346177 DOI: 10.1021/acs.orglett.8b02893] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A cooperative Lewis acid/photocatalytic reduction of arylidene malonates yields a versatile radical anion species. This intermediate preferentially undergoes intermolecular radical-radical coupling reactions, and not the conjugate addition-dimerization reactivity typically observed in the single-electron reduction of conjugate acceptors. Reported here is the development of this open-shell species in intermolecular radical-radical cross couplings, radical dimerizations, and transfer hydrogenations. This reactivity underscores the enabling modularity of cooperative catalysis and demonstrates the utility of stabilized enoate-derived radical anions in intermolecular bond forming reactions.
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Affiliation(s)
- Benjamin R McDonald
- Department of Chemistry, Center for Molecular Innovation and Drug Discovery , Northwestern University , 2145 Sheridan Road , Evanston , Illinois 60208 , United States
| | - Karl A Scheidt
- Department of Chemistry, Center for Molecular Innovation and Drug Discovery , Northwestern University , 2145 Sheridan Road , Evanston , Illinois 60208 , United States
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207
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Liu F, Zhao G, Cai W, Xu D, Zhao B. Aminative Umpolung cyclization for synthesis of chiral exocyclic vicinal diamines. Org Biomol Chem 2018; 16:7498-7502. [PMID: 30276411 DOI: 10.1039/c8ob02000k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Chiral exocylic vicinal diamines are biologically and chemically important compounds, but they are not easy to make. In this paper, an interesting aminative Umpolung cyclization process has been developed. Aromatic aldehydes 6 bearing an electrophilic chiral sulfinimine group underwent imine formation with 2,2-diphenylglycine (2), decarboxylation, and subsequent Umpolung cyclization, producing various trans-diamines 10 in 84-96% yields with high trans/cis ratios under very mild conditions. This work not only provides an efficient, clean, and mild method for the synthesis of chiral exocyclic vicinal diamines in one step but also represents a new application of aminative Umpolung strategy on intramolecular reactions.
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Affiliation(s)
- Feng Liu
- The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, P. R. China.
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208
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Kondoh A, Iino A, Ishikawa S, Aoki T, Terada M. Efficient Synthesis of Polysubstituted Pyrroles Based on [3+2] Cycloaddition Strategy Utilizing [1,2]‐Phospha‐Brook Rearrangement under Brønsted Base Catalysis. Chemistry 2018; 24:15246-15253. [DOI: 10.1002/chem.201803809] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2018] [Revised: 08/16/2018] [Indexed: 11/09/2022]
Affiliation(s)
- Azusa Kondoh
- Research and Analytical Center for Giant MoleculesGraduate School of ScienceTohoku University Aramaki Aoba-ku Sendai 980-8578 Japan
| | - Akio Iino
- Department of ChemistryGraduate School of ScienceTohoku University Aramaki Aoba-ku Sendai 980-8578 Japan
| | - Sho Ishikawa
- Department of ChemistryGraduate School of ScienceTohoku University Aramaki Aoba-ku Sendai 980-8578 Japan
| | - Takuma Aoki
- Department of ChemistryGraduate School of ScienceTohoku University Aramaki Aoba-ku Sendai 980-8578 Japan
| | - Masahiro Terada
- Department of ChemistryGraduate School of ScienceTohoku University Aramaki Aoba-ku Sendai 980-8578 Japan
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209
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Abstract
An intramolecular umpolung allylation of imines is reported. This reaction occurs via the intermediacy of 2-azaallyl anions. It could proceed either under transition-metal-catalyzed conditions or under transition-metal-free conditions. Importantly, this approach afforded trans-3-vinyl-4-aminochromanes with high diastereoselectivity, while conventional, nonumpolung methods often display high cis-selectivity.
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Affiliation(s)
- Miao Zhan
- Department of Emergency, State Key Laboratory of Biotherapy, West China Hospital , Sichuan University, and Collaborative Innovation Center for Biotherapy , Chengdu 610041 , China
| | - Xiang Pu
- Department of Emergency, State Key Laboratory of Biotherapy, West China Hospital , Sichuan University, and Collaborative Innovation Center for Biotherapy , Chengdu 610041 , China
| | - Bin He
- Department of Emergency, State Key Laboratory of Biotherapy, West China Hospital , Sichuan University, and Collaborative Innovation Center for Biotherapy , Chengdu 610041 , China
| | - Dawen Niu
- Department of Emergency, State Key Laboratory of Biotherapy, West China Hospital , Sichuan University, and Collaborative Innovation Center for Biotherapy , Chengdu 610041 , China
| | - Xia Zhang
- Department of Emergency, State Key Laboratory of Biotherapy, West China Hospital , Sichuan University, and Collaborative Innovation Center for Biotherapy , Chengdu 610041 , China
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210
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Grugel CP, Breit B. Rhodium‐Catalyzed Asymmetric Allylation of Malononitriles as Masked Acyl Cyanide with Allenes: Efficient Access to β,γ‐Unsaturated Carbonyls. Chemistry 2018; 24:15223-15226. [DOI: 10.1002/chem.201804150] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Indexed: 01/02/2023]
Affiliation(s)
- Christian P. Grugel
- Albert-Ludwigs-Universität FreiburgInstitut für Organische Chemie Albertstr. 21 79104 Freiburg Germany
| | - Bernhard Breit
- Albert-Ludwigs-Universität FreiburgInstitut für Organische Chemie Albertstr. 21 79104 Freiburg Germany
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211
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Turnbull BWH, Evans PA. Asymmetric Rhodium-Catalyzed Allylic Substitution Reactions: Discovery, Development and Applications to Target-Directed Synthesis. J Org Chem 2018; 83:11463-11479. [DOI: 10.1021/acs.joc.8b00583] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Ben W. H. Turnbull
- Department of Chemistry, Queen’s University, 90 Bader Lane, Kingston K7L 3N6, Canada
| | - P. Andrew Evans
- Department of Chemistry, Queen’s University, 90 Bader Lane, Kingston K7L 3N6, Canada
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212
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Affiliation(s)
- Martin Juhl
- Department of Chemistry; Nano-Science Center; University of Copenhagen; Universitetsparken 5 Copenhagen Ø 2100 Denmark
| | - Ji-Woong Lee
- Department of Chemistry; Nano-Science Center; University of Copenhagen; Universitetsparken 5 Copenhagen Ø 2100 Denmark
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213
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Juhl M, Lee JW. Umpolung Reactivity of Aldehydes toward Carbon Dioxide. Angew Chem Int Ed Engl 2018; 57:12318-12322. [PMID: 30035859 DOI: 10.1002/anie.201806569] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Revised: 07/16/2018] [Indexed: 01/08/2023]
Abstract
Carbon dioxide is an intrinsically stable molecule. Therefore, its activation requires extra energy input in the form of reactive reagents and/or activated catalysts and, often, harsh reaction conditions. Reported here is a direct carboxylation reaction of aromatic aldehydes with carbon dioxide to afford α-keto acids as added-value products. In situ generation of a reactive cyanohydrin was the key to the successful carboxylation reaction under operationally mild reaction conditions (25-40 °C, 1 atm CO2 ). The resulting α-keto acids served as a platform for α-amino acid synthesis by reductive amination reactions, illustrating the chemical synthesis of essential bioactive molecules from carbon dioxide.
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Affiliation(s)
- Martin Juhl
- Department of Chemistry, Nano-Science Center, University of Copenhagen, Universitetsparken 5, Copenhagen Ø, 2100, Denmark
| | - Ji-Woong Lee
- Department of Chemistry, Nano-Science Center, University of Copenhagen, Universitetsparken 5, Copenhagen Ø, 2100, Denmark
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214
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Kondoh A, Aoki T, Terada M. Organocatalytic Arylation of α-Ketoesters Based on Umpolung Strategy: Phosphazene-Catalyzed SN
Ar Reaction Utilizing [1,2]-Phospha-Brook Rearrangement. Chemistry 2018; 24:13110-13113. [DOI: 10.1002/chem.201803218] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Indexed: 11/08/2022]
Affiliation(s)
- Azusa Kondoh
- Research and Analytical Center for Giant Molecules; Graduate School of Science; Tohoku University; Aramaki Aoba-ku Sendai 980-8578 Japan
| | - Takuma Aoki
- Department of Chemistry; Graduate School of Science; Tohoku University; Aramaki Aoba-ku Sendai 980-8578 Japan
| | - Masahiro Terada
- Department of Chemistry; Graduate School of Science; Tohoku University; Aramaki Aoba-ku Sendai 980-8578 Japan
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215
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Light-driven molecular trap enables bidirectional manipulation of dynamic covalent systems. Nat Chem 2018; 10:1031-1036. [DOI: 10.1038/s41557-018-0106-8] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Accepted: 06/13/2018] [Indexed: 12/16/2022]
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216
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Chen P, Yue Z, Zhang J, Lv X, Wang L, Zhang J. Phosphine-Catalyzed Asymmetric Umpolung Addition of Trifluoromethyl Ketimines to Morita-Baylis-Hillman Carbonates. Angew Chem Int Ed Engl 2018; 55:13316-13320. [PMID: 27634055 DOI: 10.1002/anie.201607918] [Citation(s) in RCA: 104] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2016] [Indexed: 12/17/2022]
Abstract
A novel phosphine-catalyzed, highly enantioselective umpolung addition of trifluoromethyl ketimines to Morita-Baylis-Hillman carbonates was developed and it provides facile access to optically active trifluoromethyl amines with a chiral tertiary stereocenter under mild reaction conditions. The salient features of this reaction include general substrate scope, mild reaction conditions, good yields, high enantioselectivity, ease of scale-up to gram scale, and further transformations of the products.
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Affiliation(s)
- Peng Chen
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062, P.R. China
| | - Zhenting Yue
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062, P.R. China
| | - Junyou Zhang
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062, P.R. China
| | - Xi Lv
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062, P.R. China
| | - Lei Wang
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062, P.R. China
| | - Junliang Zhang
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062, P.R. China.
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217
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Kärkäs MD. Electrochemical strategies for C-H functionalization and C-N bond formation. Chem Soc Rev 2018; 47:5786-5865. [PMID: 29911724 DOI: 10.1039/c7cs00619e] [Citation(s) in RCA: 588] [Impact Index Per Article: 98.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Conventional methods for carrying out carbon-hydrogen functionalization and carbon-nitrogen bond formation are typically conducted at elevated temperatures, and rely on expensive catalysts as well as the use of stoichiometric, and perhaps toxic, oxidants. In this regard, electrochemical synthesis has recently been recognized as a sustainable and scalable strategy for the construction of challenging carbon-carbon and carbon-heteroatom bonds. Here, electrosynthesis has proven to be an environmentally benign, highly effective and versatile platform for achieving a wide range of nonclassical bond disconnections via generation of radical intermediates under mild reaction conditions. This review provides an overview on the use of anodic electrochemical methods for expediting the development of carbon-hydrogen functionalization and carbon-nitrogen bond formation strategies. Emphasis is placed on methodology development and mechanistic insight and aims to provide inspiration for future synthetic applications in the field of electrosynthesis.
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Affiliation(s)
- Markus D Kärkäs
- Department of Chemistry, Organic Chemistry, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden.
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218
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Abstract
The first stable anionic aluminium nucleophile was isolated by Goicoechea, Aldridge and co-workers. The aluminyl compound showed very high reactivity in metathesis reactions as well as in the oxidative addition of substrates such as dihydrogen and benzene, which opens up new perspectives in main group chemistry.
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Affiliation(s)
- Alexander Hinz
- Karlsruhe Institute of Technology (KIT), Institute of Inorganic Chemistry, Engesserstr. 15, 76131, Karlsruhe, Germany
| | - Frank Breher
- Karlsruhe Institute of Technology (KIT), Institute of Inorganic Chemistry, Engesserstr. 15, 76131, Karlsruhe, Germany
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219
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Paul M, Sudkaow P, Wessels A, Schlörer NE, Neudörfl J, Berkessel A. Breslow Intermediates from Aromatic N‐Heterocyclic Carbenes (Benzimidazolin‐2‐ylidenes, Thiazolin‐2‐ylidenes). Angew Chem Int Ed Engl 2018; 57:8310-8315. [PMID: 29645334 DOI: 10.1002/anie.201801676] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2018] [Indexed: 12/29/2022]
Affiliation(s)
- Mathias Paul
- Cologne UniversityDepartment of Chemistry, Organic Chemistry Greinstrasse 4 50939 Cologne Germany
| | - Panyapon Sudkaow
- Cologne UniversityDepartment of Chemistry, Organic Chemistry Greinstrasse 4 50939 Cologne Germany
| | - Alina Wessels
- Cologne UniversityDepartment of Chemistry, Organic Chemistry Greinstrasse 4 50939 Cologne Germany
| | - Nils E. Schlörer
- Cologne UniversityDepartment of Chemistry, Organic Chemistry Greinstrasse 4 50939 Cologne Germany
| | - Jörg‐M. Neudörfl
- Cologne UniversityDepartment of Chemistry, Organic Chemistry Greinstrasse 4 50939 Cologne Germany
| | - Albrecht Berkessel
- Cologne UniversityDepartment of Chemistry, Organic Chemistry Greinstrasse 4 50939 Cologne Germany
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220
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Paul M, Sudkaow P, Wessels A, Schlörer NE, Neudörfl J, Berkessel A. Breslow‐Intermediate aromatischer N‐heterocyclischer Carbene (Benzimidazolin‐2‐ylidene, Thiazolin‐2‐ylidene). Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201801676] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Mathias Paul
- Universität zu KölnDepartment für ChemieOrganische Chemie Greinstraße 4 50939 Köln Deutschland
| | - Panyapon Sudkaow
- Universität zu KölnDepartment für ChemieOrganische Chemie Greinstraße 4 50939 Köln Deutschland
| | - Alina Wessels
- Universität zu KölnDepartment für ChemieOrganische Chemie Greinstraße 4 50939 Köln Deutschland
| | - Nils E. Schlörer
- Universität zu KölnDepartment für ChemieOrganische Chemie Greinstraße 4 50939 Köln Deutschland
| | - Jörg‐M. Neudörfl
- Universität zu KölnDepartment für ChemieOrganische Chemie Greinstraße 4 50939 Köln Deutschland
| | - Albrecht Berkessel
- Universität zu KölnDepartment für ChemieOrganische Chemie Greinstraße 4 50939 Köln Deutschland
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221
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Dadová J, Galan SR, Davis BG. Synthesis of modified proteins via functionalization of dehydroalanine. Curr Opin Chem Biol 2018; 46:71-81. [PMID: 29913421 DOI: 10.1016/j.cbpa.2018.05.022] [Citation(s) in RCA: 92] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Revised: 05/02/2018] [Accepted: 05/29/2018] [Indexed: 12/17/2022]
Abstract
Dehydroalanine has emerged in recent years as a non-proteinogenic residue with strong chemical utility in proteins for the study of biology. In this review we cover the several methods now available for its flexible and site-selective incorporation via a variety of complementary chemical and biological techniques and examine its reactivity, allowing both creation of modified protein side-chains through a variety of bond-forming methods (C-S, C-N, C-Se, C-C) and as an activity-based probe in its own right. We illustrate its utility with selected examples of biological and technological discovery and application.
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Affiliation(s)
- Jitka Dadová
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Sébastien Rg Galan
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Benjamin G Davis
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford OX1 3TA, United Kingdom.
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222
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Affiliation(s)
- Alexander Hinz
- Karlsruher Institut für Technologie (KIT); Institut für Anorganische Chemie; Engesserstraße 15 76131 Karlsruhe Deutschland
| | - Frank Breher
- Karlsruher Institut für Technologie (KIT); Institut für Anorganische Chemie; Engesserstraße 15 76131 Karlsruhe Deutschland
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223
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Yan J, Sun R, Shi K, Li K, Yang L, Zhong G. N-Heterocyclic Carbene-Catalyzed Asymmetric Benzoin Reaction in Water. J Org Chem 2018; 83:7547-7552. [DOI: 10.1021/acs.joc.8b00481] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Jun Yan
- College of Materials, Chemistry & Chemical Engineering, Hangzhou Normal University, Hangzhou 310036, China
| | - Rong Sun
- College of Materials, Chemistry & Chemical Engineering, Hangzhou Normal University, Hangzhou 310036, China
| | - Kuangxi Shi
- College of Materials, Chemistry & Chemical Engineering, Hangzhou Normal University, Hangzhou 310036, China
| | - Kai Li
- College of Materials, Chemistry & Chemical Engineering, Hangzhou Normal University, Hangzhou 310036, China
| | - Limin Yang
- College of Materials, Chemistry & Chemical Engineering, Hangzhou Normal University, Hangzhou 310036, China
| | - Guofu Zhong
- College of Materials, Chemistry & Chemical Engineering, Hangzhou Normal University, Hangzhou 310036, China
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224
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de Souza JM, Brocksom TJ, McQuade DT, de Oliveira KT. Continuous Endoperoxidation of Conjugated Dienes and Subsequent Rearrangements Leading to C-H Oxidized Synthons. J Org Chem 2018; 83:7574-7585. [PMID: 29860826 DOI: 10.1021/acs.joc.8b01307] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have investigated the continuous flow photooxidation of several conjugated dienes and subsequent rearrangement using a practical and safe continuous-flow homemade engineered setup. End-to-end approaches involving endoperoxidation, Kornblum-DeLaMare rearrangement, and additional rearrangements are comprehensively detailed with optimization, scope, and scale-up to obtain useful hydroxyenones, furans, and 1,4-dicarbonyl building blocks.
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Affiliation(s)
- Juliana M de Souza
- Departamento de Química , Universidade Federal de São Carlos , São Carlos , SP 13565-905 , Brazil
| | - Timothy J Brocksom
- Departamento de Química , Universidade Federal de São Carlos , São Carlos , SP 13565-905 , Brazil.,Centro de Ciências Naturais e Humanas , Universidade Federal do ABC , Santo André , SP 09210-580 , Brazil
| | - D Tyler McQuade
- Department of Chemical and Life Science Engineering , Virginia Commonwealth University , Richmond , Virginia 23284-3068 , United States
| | - Kleber T de Oliveira
- Departamento de Química , Universidade Federal de São Carlos , São Carlos , SP 13565-905 , Brazil
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225
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Zhou J, Liu LL, Cao LL, Stephan DW. An umpolung of Lewis acidity/basicity at nitrogen by deprotonation of a cyclic (amino)(aryl)nitrenium cation. Chem Commun (Camb) 2018. [PMID: 29527605 DOI: 10.1039/c8cc01331d] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
A cyclic (amino)(aryl)nitrenium cation 2 has been achieved by treatment of spiro[fluorene-9,3'-indazole] (1) with Ph2CHCl and AgBF4. This cation 2 is Lewis acidic at nitrenium N1, reacting with PMe3 affording a Lewis acid/base adduct 3. In contrast, deprotonation of 2 with other bases provides a neutral compound 4 which is Lewis basic at N1, reacting with electrophiles including GaCl3, MeOTf and PhNCO.
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Affiliation(s)
- Jiliang Zhou
- Department of Chemistry, University of Toronto, 80 St. George St., Toronto, Ontario M5S 3H6, Canada.
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226
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Yan SS, Zhu L, Ye JH, Zhang Z, Huang H, Zeng H, Li CJ, Lan Y, Yu DG. Ruthenium-catalyzed umpolung carboxylation of hydrazones with CO 2. Chem Sci 2018; 9:4873-4878. [PMID: 29910940 PMCID: PMC5982211 DOI: 10.1039/c8sc01299g] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Accepted: 04/27/2018] [Indexed: 11/26/2022] Open
Abstract
The first ruthenium-catalyzed umpolung carboxylation of hydrazones with CO2 to generate important aryl acetic acids is reported.
The first ruthenium-catalyzed umpolung carboxylation of hydrazones with CO2 to generate important aryl acetic acids is reported. Besides aldehyde hydrazones, a variety of ketone hydrazones, which have not been successfully applied in previous umpolung reactions with other reactive electrophiles, also show high reactivity and selectivity under mild conditions. Moreover, this operationally simple protocol features good functional group tolerance, is readily scalable, and offers easy derivation of important structures, including bioactive felbinac and adiphenine. Computational studies reveal that this umpolung reaction proceeds through the generation of a Ru-nitrenoid followed by concerted [4 + 2] cycloaddition with CO2.
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Affiliation(s)
- Si-Shun Yan
- Key Laboratory of Green Chemistry & Technology of Ministry of Education , College of Chemistry , Sichuan University , 29 Wangjiang Road , Chengdu 610064 , P. R. China .
| | - Lei Zhu
- School of Chemistry and Chemical Engineering , Chongqing University , Chongqing 400030 , P. R. China .
| | - Jian-Heng Ye
- Key Laboratory of Green Chemistry & Technology of Ministry of Education , College of Chemistry , Sichuan University , 29 Wangjiang Road , Chengdu 610064 , P. R. China .
| | - Zhen Zhang
- Key Laboratory of Green Chemistry & Technology of Ministry of Education , College of Chemistry , Sichuan University , 29 Wangjiang Road , Chengdu 610064 , P. R. China .
| | - He Huang
- Key Laboratory of Green Chemistry & Technology of Ministry of Education , College of Chemistry , Sichuan University , 29 Wangjiang Road , Chengdu 610064 , P. R. China .
| | - Huiying Zeng
- The State Key Laboratory of Applied Organic Chemistry , Lanzhou University , Lanzhou 730000 , P. R. China
| | - Chao-Jun Li
- The State Key Laboratory of Applied Organic Chemistry , Lanzhou University , Lanzhou 730000 , P. R. China.,Department of Chemistry and FQRNT Centre for Green Chemistry and Catalysis , McGill University , 801 Sherbrooke St. W. , Montreal , Quebec H3A 0B8 , Canada .
| | - Yu Lan
- School of Chemistry and Chemical Engineering , Chongqing University , Chongqing 400030 , P. R. China .
| | - Da-Gang Yu
- Key Laboratory of Green Chemistry & Technology of Ministry of Education , College of Chemistry , Sichuan University , 29 Wangjiang Road , Chengdu 610064 , P. R. China . .,State Key Laboratory of Elemento-Organic Chemistry , Nankai University , Tianjin 300071 , P. R. China
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227
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Sun SZ, Martin R. Nickel-Catalyzed Umpolung Arylation of Ambiphilic α-Bromoalkyl Boronic Esters. Angew Chem Int Ed Engl 2018; 57:3622-3625. [PMID: 29446875 DOI: 10.1002/anie.201712428] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Indexed: 12/14/2022]
Abstract
A nickel-catalyzed reductive arylation of ambiphilic α-bromoalkyl boronic esters with aryl halides is described. This platform provides an unrecognized opportunity to promote the catalytic umpolung reactivity of ambiphilic reagents with aryl halides, thus unlocking a new cross-coupling strategy that complements existing methods for the preparation of densely functionalized alkyl-substituted organometallic reagents from simple and readily accessible precursors.
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Affiliation(s)
- Shang-Zheng Sun
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007, Tarragona, Spain
| | - Ruben Martin
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007, Tarragona, Spain.,Catalan Institution for Research and Advanced Studies (ICREA), Passeig Lluïs Companys, 23, 08010, Barcelona, Spain
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228
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Kim H, Yonekura Y, Yoshida JI. A Catalyst-Free Amination of Functional Organolithium Reagents by Flow Chemistry. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201713031] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Heejin Kim
- Department of Synthetic Chemistry and Biological Chemistry; Graduate School of Engineering; Kyoto University; Nishikyo-ku Kyoto 615-8510 Japan
| | - Yuya Yonekura
- Department of Synthetic Chemistry and Biological Chemistry; Graduate School of Engineering; Kyoto University; Nishikyo-ku Kyoto 615-8510 Japan
| | - Jun-ichi Yoshida
- Department of Synthetic Chemistry and Biological Chemistry; Graduate School of Engineering; Kyoto University; Nishikyo-ku Kyoto 615-8510 Japan
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229
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Sun SZ, Martin R. Nickel-Catalyzed Umpolung Arylation of Ambiphilic α-Bromoalkyl Boronic Esters. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201712428] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Shang-Zheng Sun
- Institute of Chemical Research of Catalonia (ICIQ); The Barcelona Institute of Science and Technology; Av. Països Catalans 16 43007 Tarragona Spain
| | - Ruben Martin
- Institute of Chemical Research of Catalonia (ICIQ); The Barcelona Institute of Science and Technology; Av. Països Catalans 16 43007 Tarragona Spain
- Catalan Institution for Research and Advanced Studies (ICREA); Passeig Lluïs Companys, 23 08010 Barcelona Spain
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230
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Kim H, Yonekura Y, Yoshida JI. A Catalyst-Free Amination of Functional Organolithium Reagents by Flow Chemistry. Angew Chem Int Ed Engl 2018; 57:4063-4066. [DOI: 10.1002/anie.201713031] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Revised: 02/04/2018] [Indexed: 12/22/2022]
Affiliation(s)
- Heejin Kim
- Department of Synthetic Chemistry and Biological Chemistry; Graduate School of Engineering; Kyoto University; Nishikyo-ku Kyoto 615-8510 Japan
| | - Yuya Yonekura
- Department of Synthetic Chemistry and Biological Chemistry; Graduate School of Engineering; Kyoto University; Nishikyo-ku Kyoto 615-8510 Japan
| | - Jun-ichi Yoshida
- Department of Synthetic Chemistry and Biological Chemistry; Graduate School of Engineering; Kyoto University; Nishikyo-ku Kyoto 615-8510 Japan
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231
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Su YL, Li YH, Chen YG, Han ZY. Ir/PTC cooperatively catalyzed asymmetric umpolung allylation of α-imino ester enabled synthesis of α-quaternary amino acid derivatives bearing two vicinal stereocenters. Chem Commun (Camb) 2018; 53:1985-1988. [PMID: 28121003 DOI: 10.1039/c6cc09654a] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
A novel Ir/PTC (phase-transfer catalyst) cooperatively catalyzed asymmetric umpolung allylation of simple α-imino esters is developed and it provides facile access to α-quaternary amino acid derivatives bearing two vicinal stereocenters. Both the metal catalyst and the phase-transfer catalyst are crucial for this methodology. The reaction features good yields, high diastereo- and enantio-selectivities, ease of scale-up to gram scale and further transformation of the products (e.g. to quaternary proline analogues with multi stereocenters).
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Affiliation(s)
- Yong-Liang Su
- Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China.
| | - Yu-Hui Li
- Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China.
| | - Yu-Gen Chen
- Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China.
| | - Zhi-Yong Han
- Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China.
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232
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Maity N, Barman S, Abou-Hamad E, D'Elia V, Basset JM. Clean chlorination of silica surfaces by a single-site substitution approach. Dalton Trans 2018; 47:4301-4306. [PMID: 29488534 DOI: 10.1039/c8dt00186c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A chlorination method for the selective substitution of well-defined isolated silanol groups of the silica surface has been developed using the catalytic Appel reaction. Spectroscopic analysis, complemented by elemental microanalysis studies, reveals that a quantitative chlorination could be achieved with highly dehydroxylated silica materials that exclusively possess non-hydrogen bonded silanol groups. The employed method did not leave any carbon or phosphorus residue on the silica surface and can be regarded as a promising tool for the future functionalization of metal oxide surfaces.
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Affiliation(s)
- Niladri Maity
- King Abdullah University of Science & Technology, KAUST Catalysis Center (KCC), 23955-6900 Thuwal, Saudi Arabia. and Department of Chemistry, Indira Gandhi Institute of Technology, Sarang, Dhenkanal, Odisha-759146, India
| | - Samir Barman
- King Abdullah University of Science & Technology, KAUST Catalysis Center (KCC), 23955-6900 Thuwal, Saudi Arabia.
| | - Edy Abou-Hamad
- King Abdullah University of Science & Technology, KAUST Catalysis Center (KCC), 23955-6900 Thuwal, Saudi Arabia.
| | - Valerio D'Elia
- King Abdullah University of Science & Technology, KAUST Catalysis Center (KCC), 23955-6900 Thuwal, Saudi Arabia. and Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), 21210, Payupnai, WangChan, Rayong, Thailand.
| | - Jean-Marie Basset
- King Abdullah University of Science & Technology, KAUST Catalysis Center (KCC), 23955-6900 Thuwal, Saudi Arabia.
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233
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Noda H, Kumagai N, Shibasaki M. Catalytic Asymmetric Synthesis of α‐Trifluoromethylated Carbinols: A Case Study of Tertiary Propargylic Alcohols. ASIAN J ORG CHEM 2018. [DOI: 10.1002/ajoc.201800013] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Hidetoshi Noda
- Institute of Microbial Chemistry (BIKAKEN), Tokyo 3-14-23 Kamiosaki Shinagawa-ku Tokyo 141-0021 Japan
| | - Naoya Kumagai
- Institute of Microbial Chemistry (BIKAKEN), Tokyo 3-14-23 Kamiosaki Shinagawa-ku Tokyo 141-0021 Japan
| | - Masakatsu Shibasaki
- Institute of Microbial Chemistry (BIKAKEN), Tokyo 3-14-23 Kamiosaki Shinagawa-ku Tokyo 141-0021 Japan
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234
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Abstract
This perspective represents a (highly personal) examination of the past, present and future of synthetic organic chemistry. The central thesis posits that the confluence of factors that led to the "Golden Age of Natural Product Synthesis" in the second half of the twentieth century can be traced back to the identification of the therapeutic potential of steroid hormones culminating in the introduction of oral contraceptives. The tremendous benefits of those activities to the development of organic synthesis as a vibrant discipline led to the exponential increase in strategies and methods and the ability to tackle, larger and larger molecules of greater and greater complexity. The existential challenge to the health of organic synthesis is whether a similarly dynamic future can be anticipated and if so, to what end and how. Musings on potential answers to those questions are presented.
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Affiliation(s)
- Scott E Denmark
- Roger Adams Laboratory, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL 61801 (USA)
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235
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More AA, Pathe GK, Parida KN, Maksymenko S, Lipisa YB, Szpilman AM. α-N-Heteroarylation and α-Azidation of Ketones via Enolonium Species. J Org Chem 2018; 83:2442-2447. [PMID: 29334466 DOI: 10.1021/acs.joc.7b03058] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Enolonium species, resulting from the umpolung of ketone enolates by Koser's hypervalent iodine reagents activated by boron trifluoride, react with a variety of nitrogen heterocycles to form α-aminated ketones. The reactions are mild and complete in 4-5 h. Additionally, α-azidation of the enolonium species takes place using trimethylsilyl azide as a convenient source of azide nucleophile.
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Affiliation(s)
- Atul A More
- Department of Chemical Sciences, Ariel University , 4070000 Ariel, Israel
| | - Gulab K Pathe
- Department of Chemical Sciences, Ariel University , 4070000 Ariel, Israel
| | - Keshaba N Parida
- Department of Chemical Sciences, Ariel University , 4070000 Ariel, Israel
| | - Shimon Maksymenko
- Department of Chemical Sciences, Ariel University , 4070000 Ariel, Israel
| | - Yuriy B Lipisa
- Department of Chemical Sciences, Ariel University , 4070000 Ariel, Israel
| | - Alex M Szpilman
- Department of Chemical Sciences, Ariel University , 4070000 Ariel, Israel
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236
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Vale JR, Rimpiläinen T, Sievänen E, Rissanen K, Afonso CAM, Candeias NR. Pot-Economy Autooxidative Condensation of 2-Aryl-2-lithio-1,3-dithianes. J Org Chem 2018; 83:1948-1958. [PMID: 29334462 PMCID: PMC6150673 DOI: 10.1021/acs.joc.7b02896] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The autoxidative condensation of 2-aryl-2-lithio-1,3-dithianes is here reported. Treatment of 2-aryl-1,3-dithianes with n-BuLi in the absence of any electrophile leads to condensation of three molecules of 1,3-dithianes and formation of highly functionalized α-thioether ketones orthothioesters in 51-89% yields upon air exposure. The method was further expanded to benzaldehyde dithioacetals, affording corresponding orthothioesters and α-thioether ketones in 48-97% yields. The experimental results combined with density functional theory studies support a mechanism triggered by the autoxidation of 2-aryl-2-lithio-1,3-dithianes to yield a highly reactive thioester that undergoes condensation with two other molecules of 2-aryl-2-lithio-1,3-dithiane.
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Affiliation(s)
- João R Vale
- Laboratory of Chemistry and Bioengineering, Tampere University of Technology , Korkeakoulunkatu 8, 33101 Tampere, Finland.,Instituto de Investigação do Medicamento (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa , Av. Prof. Gama Pinto, 1649-003 Lisboa, Portugal
| | - Tatu Rimpiläinen
- Laboratory of Chemistry and Bioengineering, Tampere University of Technology , Korkeakoulunkatu 8, 33101 Tampere, Finland
| | - Elina Sievänen
- University of Jyvaskyla , Department of Chemistry, Nanoscience Center, P.O. Box 35, 40014 Jyväskylä, Finland
| | - Kari Rissanen
- University of Jyvaskyla , Department of Chemistry, Nanoscience Center, P.O. Box 35, 40014 Jyväskylä, Finland
| | - Carlos A M Afonso
- Instituto de Investigação do Medicamento (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa , Av. Prof. Gama Pinto, 1649-003 Lisboa, Portugal
| | - Nuno R Candeias
- Laboratory of Chemistry and Bioengineering, Tampere University of Technology , Korkeakoulunkatu 8, 33101 Tampere, Finland
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237
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Rai VK, Verma F, Sahu GP, Singh M, Rai A. One-Pot Allan-Robinson/Friedländer Route to Chromen-/Quinolin-4-ones through the Domino Acetylative Cyclisation of 2-Hydroxy-/2-Aminobenzaldehydes. European J Org Chem 2018. [DOI: 10.1002/ejoc.201701435] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Vijai K. Rai
- Department of Chemistry; Guru Ghasidas Vishwavidyalaya; -495 009, C. G. Bilaspur India
| | - Fooleswar Verma
- Department of Chemistry; Guru Ghasidas Vishwavidyalaya; -495 009, C. G. Bilaspur India
| | - Ganeshwar P. Sahu
- Department of Chemistry; Guru Ghasidas Vishwavidyalaya; -495 009, C. G. Bilaspur India
| | - Manorama Singh
- Department of Chemistry; Guru Ghasidas Vishwavidyalaya; -495 009, C. G. Bilaspur India
| | - Ankita Rai
- School of Physical Sciences; Jawaharlal Nehru University; -110 027. New Delhi India
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238
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Geng X, Wu X, Wang C, Zhao P, Zhou Y, Sun X, Wang LJ, Guan WJ, Wu YD, Wu AX. NaHS·nH2O-induced umpolung: the synthesis of 2-acyl-3-aminoindoles from aryl methyl ketones and 2-aminobenzonitriles. Chem Commun (Camb) 2018; 54:12730-12733. [DOI: 10.1039/c8cc07599a] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient method for constructing 2-acyl-3-aminoindoles from methyl ketones and 2-aminobenzonitriles is described, in which NaHS·nH2O is used as a novel umpolung reagent for the first time in organic synthesis.
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239
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Yang L, Lv Y, Wang F, Zhong G. Chiral NHC-catalyzed 1,3-dipolar [3 + 2] cycloaddition of azomethine imines with α-chloroaldehydes for the synthesis of bicyclic pyrazolidinones. Org Biomol Chem 2018; 16:4433-4438. [DOI: 10.1039/c8ob00925b] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
An NHC-catalyzed [3 + 2] cycloaddition reaction of azomethine imines and α-chloroaldehydes was developed for the synthesis of chiral bicyclic pyrazolidinone derivatives.
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Affiliation(s)
- Limin Yang
- College of Materials
- Chemistry & Chemical Engineering
- Hangzhou Normal University
- Hangzhou 310036
- China
| | - Yunbo Lv
- College of Materials
- Chemistry & Chemical Engineering
- Hangzhou Normal University
- Hangzhou 310036
- China
| | - Fei Wang
- College of Materials
- Chemistry & Chemical Engineering
- Hangzhou Normal University
- Hangzhou 310036
- China
| | - Guofu Zhong
- College of Materials
- Chemistry & Chemical Engineering
- Hangzhou Normal University
- Hangzhou 310036
- China
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240
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Mocci R, Murgia S, De Luca L, Colacino E, Delogu F, Porcheddu A. Ball-milling and cheap reagents breathe green life into the one hundred-year-old Hofmann reaction. Org Chem Front 2018. [DOI: 10.1039/c7qo01006k] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A very efficient mechanically activated synthesis of isocyanides directly from primary amines and without extra-solvent addition has been reported.
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Affiliation(s)
- Rita Mocci
- Università degli Studi di Cagliari
- Dipartimento di Scienze Chimiche e Geologiche
- 09042 Monserrato
- Italy
| | - Sergio Murgia
- Università degli Studi di Cagliari
- Dipartimento di Scienze Chimiche e Geologiche
- 09042 Monserrato
- Italy
| | - Lidia De Luca
- Università degli Studi di Sassari
- Dipartimento di Chimica e Farmacia
- 07100 Sassari
- Italy
| | - Evelina Colacino
- Università degli Studi di Cagliari
- Dipartimento di Scienze Chimiche e Geologiche
- 09042 Monserrato
- Italy
- Institut des Biomolécules Max Mousseron
| | - Francesco Delogu
- Università degli Studi di Cagliari
- Dipartimento di Ingegneria Meccanica
- Chimica
- e dei Materiali
- Cagliari
| | - Andrea Porcheddu
- Università degli Studi di Cagliari
- Dipartimento di Scienze Chimiche e Geologiche
- 09042 Monserrato
- Italy
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241
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Yan J, Shi K, Zhao C, Ding L, Jiang S, Yang L, Zhong G. NHC-catalyzed [4+2] cycloaddition reactions for the synthesis of 3′-spirocyclic oxindoles via a C–F bond cleavage protocol. Chem Commun (Camb) 2018; 54:1567-1570. [DOI: 10.1039/c7cc08048d] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A chiral NHC-catalyzed cycloaddition of γ-fluoroenals is developed. The nucleophilic γ-carbon generated via C–F bond cleavage undergoes highly enantioselective cycloaddition (up to >99% ee) to isatins and provides 3′-spirocyclic oxindoles in good yields (up to 91%).
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Affiliation(s)
- Jun Yan
- College of Material
- Chemistry and Chemical Engineering
- Hangzhou Normal University
- Hangzhou 310018
- China
| | - Kuangxi Shi
- College of Material
- Chemistry and Chemical Engineering
- Hangzhou Normal University
- Hangzhou 310018
- China
| | - Chengtao Zhao
- College of Material
- Chemistry and Chemical Engineering
- Hangzhou Normal University
- Hangzhou 310018
- China
| | - Liyuan Ding
- College of Material
- Chemistry and Chemical Engineering
- Hangzhou Normal University
- Hangzhou 310018
- China
| | - Shengsheng Jiang
- College of Material
- Chemistry and Chemical Engineering
- Hangzhou Normal University
- Hangzhou 310018
- China
| | - Limin Yang
- College of Material
- Chemistry and Chemical Engineering
- Hangzhou Normal University
- Hangzhou 310018
- China
| | - Guofu Zhong
- College of Material
- Chemistry and Chemical Engineering
- Hangzhou Normal University
- Hangzhou 310018
- China
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242
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Liu J, Das DK, Zhang G, Yang S, Zhang H, Fang X. N-Heterocyclic Carbene-Catalyzed Umpolung of β,γ-Unsaturated 1,2-Diketones. Org Lett 2017; 20:64-67. [DOI: 10.1021/acs.orglett.7b03358] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jian Liu
- College
of Chemistry, Fuzhou University, Fuzhou, 350116, China
| | - Deb Kumar Das
- State
Key Laboratory of Structural Chemistry, Center for Excellence in Molecular
Synthesis, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou, 350100, China
| | - Guoxiang Zhang
- State
Key Laboratory of Structural Chemistry, Center for Excellence in Molecular
Synthesis, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou, 350100, China
| | - Shuang Yang
- State
Key Laboratory of Structural Chemistry, Center for Excellence in Molecular
Synthesis, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou, 350100, China
| | - Hao Zhang
- State
Key Laboratory of Structural Chemistry, Center for Excellence in Molecular
Synthesis, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou, 350100, China
| | - Xinqiang Fang
- State
Key Laboratory of Structural Chemistry, Center for Excellence in Molecular
Synthesis, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou, 350100, China
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243
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Lee KN, Ngai MY. Recent developments in transition-metal photoredox-catalysed reactions of carbonyl derivatives. Chem Commun (Camb) 2017; 53:13093-13112. [PMID: 29125152 PMCID: PMC5930931 DOI: 10.1039/c7cc06287g] [Citation(s) in RCA: 102] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Single-electron reduction of C[double bond, length as m-dash]O and C[double bond, length as m-dash]N bonds of aldehydes, ketones, and imines results in the formation of ketyl and α-aminoalkyl anion radicals, respectively. These reactive intermediates are characterized by an altered electronic character with respect to their parent molecules and undergo a diverse range of synthetically useful transformations, which are not available to even-electron species. This Review summarizes the reactions of ketyl and α-aminyl radicals generated from carbonyl derivatives under transition-metal photoredox-catalysed conditions. We primarily focus on recent developments in the field, as well as give a brief overview of catalytic enantioselective transformations that provide a means to achieve precise stereocontrol over the reactivity of ion radicals.
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Affiliation(s)
- Katarzyna N Lee
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, USA.
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244
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Chen P, Zhang J. Phosphine-Catalyzed Asymmetric Synthesis of α-Quaternary Amine via Umpolung γ-Addition of Ketimines to Allenoates. Org Lett 2017; 19:6550-6553. [PMID: 29182346 DOI: 10.1021/acs.orglett.7b03262] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A first phosphine-catalyzed enantioselective umpolung γ-addition of ketimines to allenoates has been developed that provides efficient access to optically active γ,δ-unsaturated α-amino esters and δ-amino esters with a chiral tertiary stereocenter under mild conditions. The salient features of this reaction include general substrate scope, mild conditions, good yields, high enantioselectivity, ease of scale-up to gram scale, and further transformations.
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Affiliation(s)
- Peng Chen
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University , 3663 North Zhongshan Road, Shanghai 200062, P. R. China
| | - Junliang Zhang
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University , 3663 North Zhongshan Road, Shanghai 200062, P. R. China
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245
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Choi J, Fu GC. Transition metal-catalyzed alkyl-alkyl bond formation: Another dimension in cross-coupling chemistry. Science 2017; 356:356/6334/eaaf7230. [PMID: 28408546 DOI: 10.1126/science.aaf7230] [Citation(s) in RCA: 538] [Impact Index Per Article: 76.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Because the backbone of most organic molecules is composed primarily of carbon-carbon bonds, the development of efficient methods for their construction is one of the central challenges of organic synthesis. Transition metal-catalyzed cross-coupling reactions between organic electrophiles and nucleophiles serve as particularly powerful tools for achieving carbon-carbon bond formation. Until recently, the vast majority of cross-coupling processes had used either aryl or alkenyl electrophiles as one of the coupling partners. In the past 15 years, versatile new methods have been developed that effect cross-couplings of an array of alkyl electrophiles, thereby greatly expanding the diversity of target molecules that are readily accessible. The ability to couple alkyl electrophiles opens the door to a stereochemical dimension-specifically, enantioconvergent couplings of racemic electrophiles-that substantially enhances the already remarkable utility of cross-coupling processes.
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Affiliation(s)
- Junwon Choi
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA
| | - Gregory C Fu
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA.
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246
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Seeman JI. On the Relationship between Classical Structure Determination and Retrosynthetic Analysis/Total Synthesis†. Isr J Chem 2017. [DOI: 10.1002/ijch.201700079] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Jeffrey I. Seeman
- Department of Chemistry; University of Richmond; Richmond VA 23173 USA
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247
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Maksymenko S, Parida KN, Pathe GK, More AA, Lipisa YB, Szpilman AM. Transition-Metal-Free Intermolecular α-Arylation of Ketones via Enolonium Species. Org Lett 2017; 19:6312-6315. [DOI: 10.1021/acs.orglett.7b03064] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Shimon Maksymenko
- Department of Chemical Sciences, Ariel University, 40700 Ariel, Israel
| | - Keshaba N. Parida
- Department of Chemical Sciences, Ariel University, 40700 Ariel, Israel
| | - Gulab K. Pathe
- Department of Chemical Sciences, Ariel University, 40700 Ariel, Israel
| | - Atul A. More
- Department of Chemical Sciences, Ariel University, 40700 Ariel, Israel
| | - Yuriy B. Lipisa
- Department of Chemical Sciences, Ariel University, 40700 Ariel, Israel
| | - Alex M. Szpilman
- Department of Chemical Sciences, Ariel University, 40700 Ariel, Israel
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248
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Binh DH, Milovanović M, Puertes-Mico J, Hamdaoui M, Zarić SD, Djukic JP. Is the R3Si Moiety in Metal-Silyl Complexes a Z ligand? An Answer from the Interaction Energy. Chemistry 2017; 23:17058-17069. [DOI: 10.1002/chem.201703373] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Indexed: 11/10/2022]
Affiliation(s)
- Dang Ho Binh
- Institut de Chimie de Strasbourg UMR7177; Université de Strasbourg; 4, rue Blaise Pascal 67000 Strasbourg France
| | - Milan Milovanović
- Institut de Chimie de Strasbourg UMR7177; Université de Strasbourg; 4, rue Blaise Pascal 67000 Strasbourg France
- Department of Chemistry; University of Belgrade; Studentski trg 12-16 11000 Belgrade Serbia
| | - Julia Puertes-Mico
- Institut de Chimie de Strasbourg UMR7177; Université de Strasbourg; 4, rue Blaise Pascal 67000 Strasbourg France
| | - Mustapha Hamdaoui
- Institut de Chimie de Strasbourg UMR7177; Université de Strasbourg; 4, rue Blaise Pascal 67000 Strasbourg France
| | - Snežana D. Zarić
- Department of Chemistry; University of Belgrade; Studentski trg 12-16 11000 Belgrade Serbia
- Department of Chemistry; Texas A&M University at Qatar, Education City, PO Box 23874; Doha Qatar
| | - Jean-Pierre Djukic
- Institut de Chimie de Strasbourg UMR7177; Université de Strasbourg; 4, rue Blaise Pascal 67000 Strasbourg France
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249
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Kaiser D, Teskey CJ, Adler P, Maulide N. Chemoselective Intermolecular Cross-Enolate-Type Coupling of Amides. J Am Chem Soc 2017; 139:16040-16043. [PMID: 29099184 PMCID: PMC5691317 DOI: 10.1021/jacs.7b08813] [Citation(s) in RCA: 70] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
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A new approach for
the synthesis of 1,4-dicarbonyl compounds is
reported. Chemoselective activation of amide carbonyl functionality
and subsequent umpolung viaN-oxide
addition generates an electrophilic enolonium species that can be
coupled with a wide range of nucleophilic enolates. The method conveys
broad functional group tolerance on both components, does not suffer
from formation of homocoupling byproducts and avoids the use of transition
metal catalysts.
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Affiliation(s)
- Daniel Kaiser
- Institute of Organic Chemistry, University of Vienna , Währinger Strasse 1090, Vienna, Austria
| | - Christopher J Teskey
- Institute of Organic Chemistry, University of Vienna , Währinger Strasse 1090, Vienna, Austria
| | - Pauline Adler
- Institute of Organic Chemistry, University of Vienna , Währinger Strasse 1090, Vienna, Austria
| | - Nuno Maulide
- Institute of Organic Chemistry, University of Vienna , Währinger Strasse 1090, Vienna, Austria
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250
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Rosenau T, Zwirchmayr NS, Hosoya T, Hofinger-Horvath A, Bacher M, Potthast A. Janus-faced 5-methyl group in 2-hydroxy-5-methyl-[1,4]-benzoquinone. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.09.038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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