1
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Mando M, Grellepois F, Blanc A, Hénon E, Riguet E. Toward Efficient and Stereoselective Aromatic and Dearomative Cope Rearrangements: Experimental and Theoretical Investigations of α-Allyl-α'-Aromatic γ-Lactone Derivatives. Chemistry 2024; 30:e202304138. [PMID: 38284279 DOI: 10.1002/chem.202304138] [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: 12/12/2023] [Revised: 01/25/2024] [Accepted: 01/29/2024] [Indexed: 01/30/2024]
Abstract
The aromatic Cope rearrangement is an elusive transformation that has been the subject of a limited number of investigations compared to those seemingly close analogues, namely the Cope and aromatic Claisen rearrangement. Herein we report our investigations inspired by moderate success observed in the course of pioneering works. By careful experimental and theoretical investigations, we demonstrate that key substitutions on 1,5-hexadiene scaffold allow fruitful transformations. Especially, efficient functionalisation of the heteroaromatic rings results from the aromatic Cope rearrangement, while highly stereoselective interrupted aromatic Cope rearrangements highlight the formation of chiral compounds through a dearomative process.
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Affiliation(s)
- Morgane Mando
- Université de Reims Champagne Ardenne, CNRS, Institut de Chimie Moléculaire de Reims, UMR 7312, 51097, Reims, France
| | - Fabienne Grellepois
- Université de Reims Champagne Ardenne, CNRS, Institut de Chimie Moléculaire de Reims, UMR 7312, 51097, Reims, France
| | - Aurélien Blanc
- Université de Strasbourg, CNRS, Institut de Chimie, UMR 7177, 4 rue Blaise Pascal, CS90032, 67081, Strasbourg, France
| | - Eric Hénon
- Université de Reims Champagne Ardenne, CNRS, Institut de Chimie Moléculaire de Reims, UMR 7312, 51097, Reims, France
| | - Emmanuel Riguet
- Université de Reims Champagne Ardenne, CNRS, Institut de Chimie Moléculaire de Reims, UMR 7312, 51097, Reims, France
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2
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Chen YH, Duan M, Lin SL, Liu YW, Cheng JK, Xiang SH, Yu P, Houk KN, Tan B. Organocatalytic aromatization-promoted umpolung reaction of imines. Nat Chem 2024; 16:408-416. [PMID: 38062248 DOI: 10.1038/s41557-023-01384-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Accepted: 10/24/2023] [Indexed: 03/07/2024]
Abstract
The umpolung functionalization of imines bears vast synthetic potential, but polarity inversion is less efficient compared with the carbonyl counterparts. Strong nucleophiles are often required to react with the N-electrophiles without catalytic and stereochemical control. Here we show an effective strategy to realize umpolung of imines promoted by organocatalytic aromatization. The attachment of strongly electron-withdrawing groups to imines could enhance the umpolung reactivity by both electronegativity and aromatic character, enabling the direct amination of (hetero)arenes with good efficiencies and stereoselectivities. Additionally, the application of chiral Brønsted acid catalyst furnishes (hetero)aryl C-N atropisomers or enantioenriched aliphatic amines via dearomative amination from N-electrophilic aromatic precursors. Control experiments and density functional theory calculations suggest an ionic mechanism for the umpolung reaction of imines. This disconnection expands the options to forge C-N bonds stereoselectively on (hetero)arenes, which represents an important synthetic pursuit, especially in medicinal chemistry.
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Affiliation(s)
- Ye-Hui Chen
- Shenzhen Grubbs Institute, Department of Chemistry, Southern University of Science and Technology, Shenzhen, China
| | - Meng Duan
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, USA
| | - Si-Li Lin
- Shenzhen Grubbs Institute, Department of Chemistry, Southern University of Science and Technology, Shenzhen, China
| | - Yu-Wei Liu
- Shenzhen Grubbs Institute, Department of Chemistry, Southern University of Science and Technology, Shenzhen, China
| | - Jun Kee Cheng
- Shenzhen Grubbs Institute, Department of Chemistry, Southern University of Science and Technology, Shenzhen, China
| | - Shao-Hua Xiang
- Shenzhen Grubbs Institute, Department of Chemistry, Southern University of Science and Technology, Shenzhen, China
| | - Peiyuan Yu
- Shenzhen Grubbs Institute, Department of Chemistry, Southern University of Science and Technology, Shenzhen, China
| | - Kendall N Houk
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, USA.
| | - Bin Tan
- Shenzhen Grubbs Institute, Department of Chemistry, Southern University of Science and Technology, Shenzhen, China.
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3
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Baidya A, Ghovvati M, Lu C, Naghsh-Nilchi H, Annabi N. Designing a Nitro-Induced Sutured Biomacromolecule to Engineer Electroconductive Adhesive Hydrogels. ACS APPLIED MATERIALS & INTERFACES 2022; 14:49483-49494. [PMID: 36286540 DOI: 10.1021/acsami.2c11348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Nitro-functionality, with a large deficit of negative charge, embraces biological importance and has proven its therapeutic essence even in chemotherapy. Functionally, with its strong electron-withdrawing capability, nitro can manipulate the electron density of organic moieties and regulates cellular-biochemical reactions. However, the chemistry of nitro-functionality to introduce physiologically relevant macroscopic properties from the molecular skeleton is unknown. Therefore, herein, a neurotransmitter moiety, dopamine, was chemically modified with a nitro-group to explore its influence on synthesizing a multifunctional biomaterial for therapeutic applications. Chemically, while the nitro-group perturbed the aromatic electron density of nitrocatecholic domain, it facilitated the suturing of nitrocatechol moieties to regain its aromaticity through a radical transfer mechanism, forming a novel macromolecular structure. Incorporation of the sutured-nitrocatecholic strand (S-nCAT) in a gelatin-based hydrogel introduced an electroconductive microenvironment through the delocalization of π-electrons in S-nCAT, while maintaining its catechol-mediated adhesive property for tissue repairing/sealing. Meanwhile, the engineered hydrogel enriched with noncovalent interactions, demonstrated excellent mechano-physical properties to support tissue functions. Cytocompatibility of the bioadhesive was assessed with in vitro and in vivo studies, confirming its potential usage for biomedical applications. In conclusion, this novel chemical approach enabled designing a multifunctional biomaterial by manipulating the electronic properties of small bioactive molecules for various biomedical applications.
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Affiliation(s)
- Avijit Baidya
- Department of Chemical and Biomolecular Engineering, University of California-Los Angeles, Los Angeles, California90095, United States
| | - Mahsa Ghovvati
- Department of Chemical and Biomolecular Engineering, University of California-Los Angeles, Los Angeles, California90095, United States
| | - Cathy Lu
- Department of Chemical and Biomolecular Engineering, University of California-Los Angeles, Los Angeles, California90095, United States
| | - Hamed Naghsh-Nilchi
- Department of Bioengineering, University of California-Los Angeles, Los Angeles, California90095, United States
| | - Nasim Annabi
- Department of Chemical and Biomolecular Engineering, University of California-Los Angeles, Los Angeles, California90095, United States
- Department of Bioengineering, University of California-Los Angeles, Los Angeles, California90095, United States
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4
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De S, Tomiczek BM, Yang Y, Ko K, Ghiviriga I, Roitberg A, Grenning AJ. Diastereoselective Indole-Dearomative Cope Rearrangements by Compounding Minor Driving Forces. Org Lett 2022; 24:3726-3730. [PMID: 35576941 PMCID: PMC10112279 DOI: 10.1021/acs.orglett.2c01381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Reported herein is the discovery of a diastereoselective indole-dearomative Cope rearrangement. A suite of minor driving forces promote dearomatization: (i) steric congestion in the starting material, (ii) alkylidene malononitrile and stilbene conjugation events in the product, and (iii) an unexpected intramolecular π-π* stack on the product side of the equilibrium. The key substrates are rapidly assembled from simple starting materials, resulting in many successful examples. The products are structurally complex and bear vicinal stereocenters generated by the dearomative Cope rearrangement. They also contain a variety of functional groups for interconversion to complex architectures.
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Affiliation(s)
- Subhadip De
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32603, United States
| | - Breanna M Tomiczek
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32603, United States
| | - Yinuo Yang
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32603, United States
| | - Kenneth Ko
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32603, United States
| | - Ion Ghiviriga
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32603, United States
| | - Adrian Roitberg
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32603, United States
| | - Alexander J Grenning
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32603, United States
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6
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Budeev A, Kantin G, Dar’in D, Krasavin M. Diazocarbonyl and Related Compounds in the Synthesis of Azoles. Molecules 2021; 26:2530. [PMID: 33926128 PMCID: PMC8123665 DOI: 10.3390/molecules26092530] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 04/21/2021] [Accepted: 04/22/2021] [Indexed: 12/15/2022] Open
Abstract
Diazocarbonyl compounds have found numerous applications in many areas of chemistry. Among the most developed fields of diazo chemistry is the preparation of azoles from diazo compounds. This approach represents a useful alternative to more conventional methods of the synthesis of azoles. A comprehensive review on the preparation of various azoles (oxazoles, thiazoles, imidazoles, pyrazoles, triazoles, and tetrazoles) from diazocarbonyl and related compounds is presented for the first time along with discussion of advantages and disadvantages of «diazo» approaches to azoles.
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Affiliation(s)
| | | | - Dmitry Dar’in
- Institute of Chemistry, St. Petersburg State University, 198504 Peterhof, Russia; (A.B.); (G.K.)
| | - Mikhail Krasavin
- Institute of Chemistry, St. Petersburg State University, 198504 Peterhof, Russia; (A.B.); (G.K.)
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7
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Abstract
Reviewed herein is the aromatic Cope rearrangement, a Cope rearrangement where one (or both) of the alkenes of the 1,5-diene are part of a greater aromatic system. While the Cope rearrangement of 1,5-dienes has seen wide utility, variation, and application in chemical synthesis, the aromatic Cope rearrangement, comparatively, has not. This review summarizes the ∼40 papers dating back to 1956 on this topic and is divided into the following sections: (1) introduction, including kinetic and thermodynamic challenges of the aromatic Cope rearrangement, and (2) key substrate features, of which there are four general types: (i) α-allyl-α-aryl malonates (and related substrates), (ii) 1-aryl-2-vinylcyclopropanes, and (iii) anion-accelerated aromatic oxy-Cope substrates, and (iv) the concept of synchronized aromaticity. Ultimately, we hope this review will draw attention to a potentially valuable transformation for arene functionalization that warrants further studies and development.
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Affiliation(s)
- Breanna M Tomiczek
- Department of Chemistry, University of Florida, PO Box 117200, Gainesville, FL, USA.
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8
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dos Passos Gomes G, Wimmer A, Smith JM, König B, Alabugin IV. CO2 or SO2: Should It Stay, or Should It Go? J Org Chem 2019; 84:6232-6243. [DOI: 10.1021/acs.joc.9b00503] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Gabriel dos Passos Gomes
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32309, United States
| | - Alexander Wimmer
- Institut für Organische Chemie, Universität Regensburg, Universitätsstraße 31, Regensburg 93040, Germany
| | - Joel M. Smith
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32309, United States
| | - Burkhard König
- Institut für Organische Chemie, Universität Regensburg, Universitätsstraße 31, Regensburg 93040, Germany
| | - Igor V. Alabugin
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32309, United States
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9
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Hughes AM, dos Passos Gomes G, Alabugin IV. Stereoelectronic Influence of a “Spectator” Propargylic Substituent Can Override Aromaticity Effects in Radical Peri-Cyclizations en Route to Expanded Polyaromatics. J Org Chem 2019; 84:1853-1862. [DOI: 10.1021/acs.joc.8b02779] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Audrey M. Hughes
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Gabriel dos Passos Gomes
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Igor V. Alabugin
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
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10
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El Arba M, Dibrell SE, Meece F, Frantz DE. Ru(II)-Catalyzed Synthesis of Substituted Furans and Their Conversion to Butenolides. Org Lett 2018; 20:5886-5888. [DOI: 10.1021/acs.orglett.8b02554] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Marie El Arba
- Department of Chemistry, The University of Texas at San Antonio, San Antonio, Texas 78249, United States
| | - Sara E. Dibrell
- Department of Chemistry, The University of Texas at San Antonio, San Antonio, Texas 78249, United States
| | - Frederick Meece
- Department of Chemistry, The University of Texas at San Antonio, San Antonio, Texas 78249, United States
| | - Doug E. Frantz
- Department of Chemistry, The University of Texas at San Antonio, San Antonio, Texas 78249, United States
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11
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Vignoni M, Walalawela N, Bonesi SM, Greer A, Thomas AH. Lipophilic Decyl Chain–Pterin Conjugates with Sensitizer Properties. Mol Pharm 2017; 15:798-807. [DOI: 10.1021/acs.molpharmaceut.7b00136] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Mariana Vignoni
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata (UNLP), CCT La Plata-CONICET, Casilla de Correo 16, Sucursal 4, 1900 La Plata, Argentina
- Department of Chemistry, Brooklyn College, City University of New York, Brooklyn, New York 11210, United States
| | - Niluksha Walalawela
- Department of Chemistry, Brooklyn College, City University of New York, Brooklyn, New York 11210, United States
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
| | - Sergio M. Bonesi
- CIHIDECAR-CONICET, Departamento de Química Orgánica, FCEyN, Universidad de Buenos Aires, Pabellón 2, 3er Piso, Ciudad Universitaria, Buenos Aires, Argentina
| | - Alexander Greer
- Department of Chemistry, Brooklyn College, City University of New York, Brooklyn, New York 11210, United States
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
| | - Andrés H. Thomas
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata (UNLP), CCT La Plata-CONICET, Casilla de Correo 16, Sucursal 4, 1900 La Plata, Argentina
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12
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Bos M, Riguet E. Iridium-catalysed asymmetric allylic alkylation of benzofuran γ-lactones followed by heteroaromatic Cope rearrangement: study of an unusual reaction sequence. Chem Commun (Camb) 2017; 53:4997-5000. [DOI: 10.1039/c7cc01529a] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The iridium-catalysed asymmetric allylic alkylation of benzofuran γ-lactones produces 1,5-hexadienes that were found to be excellent substrates for an unusual heteroaromatic Cope rearrangement.
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Affiliation(s)
- Maxence Bos
- Université de Reims Champagne-Ardenne
- Institut de Chimie Moléculaire de Reims
- CNRS UMR 7312
- UFR des Sciences Exactes et Naturelles
- 51687 Reims Cedex 2
| | - Emmanuel Riguet
- Université de Reims Champagne-Ardenne
- Institut de Chimie Moléculaire de Reims
- CNRS UMR 7312
- UFR des Sciences Exactes et Naturelles
- 51687 Reims Cedex 2
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13
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Yu X, Su F, Liu C, Yuan H, Zhao S, Zhou Z, Quan T, Luo T. Enantioselective Total Syntheses of Various Amphilectane and Serrulatane Diterpenoids via Cope Rearrangements. J Am Chem Soc 2016; 138:6261-70. [DOI: 10.1021/jacs.6b02624] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xuerong Yu
- Key
Laboratory of Bioorganic Chemistry and Molecular Engineering, Ministry
of Education and Beijing National Laboratory for Molecular Science,
College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Fan Su
- Key
Laboratory of Bioorganic Chemistry and Molecular Engineering, Ministry
of Education and Beijing National Laboratory for Molecular Science,
College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Chang Liu
- Key
Laboratory of Bioorganic Chemistry and Molecular Engineering, Ministry
of Education and Beijing National Laboratory for Molecular Science,
College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Haosen Yuan
- Key
Laboratory of Bioorganic Chemistry and Molecular Engineering, Ministry
of Education and Beijing National Laboratory for Molecular Science,
College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Shan Zhao
- Key
Laboratory of Bioorganic Chemistry and Molecular Engineering, Ministry
of Education and Beijing National Laboratory for Molecular Science,
College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Zhiyao Zhou
- Key
Laboratory of Bioorganic Chemistry and Molecular Engineering, Ministry
of Education and Beijing National Laboratory for Molecular Science,
College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Tianfei Quan
- Peking-Tsinghua
Center for Life Sciences, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
| | - Tuoping Luo
- Key
Laboratory of Bioorganic Chemistry and Molecular Engineering, Ministry
of Education and Beijing National Laboratory for Molecular Science,
College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
- Peking-Tsinghua
Center for Life Sciences, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
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14
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Vidhani DV, Krafft ME, Alabugin IV. Gold(I)-Catalyzed Allenyl Cope Rearrangement: Evolution from Asynchronicity to Trappable Intermediates Assisted by Stereoelectronic Switching. J Am Chem Soc 2016; 138:2769-79. [DOI: 10.1021/jacs.5b12920] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dinesh V. Vidhani
- Department of Chemistry & Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Marie E. Krafft
- Department of Chemistry & Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Igor V. Alabugin
- Department of Chemistry & Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
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15
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Shao Y, Tong J, Zhao Y, Zheng H, Ma L, Ma M, Wan X. [3 + 2] cycloaddition and subsequent oxidative dehydrogenation between alkenes and diazo compounds: a simple and direct approach to pyrazoles using TBAI/TBHP. Org Biomol Chem 2016; 14:8486-92. [DOI: 10.1039/c6ob01522k] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein, an efficient [3 + 2] cycloaddition and oxidative dehydrogenation reaction of diazo compounds and alkenes was well developed using TBAI/TBHP, leading to pyrazoles with moderate to high yields.
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Affiliation(s)
- Ying Shao
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology
- Advanced Catalysis and Green Manufacturing Collaborative Innovation Center
- Changzhou University
- Changzhou 213164
- P. R. China
| | - Jingjing Tong
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology
- Advanced Catalysis and Green Manufacturing Collaborative Innovation Center
- Changzhou University
- Changzhou 213164
- P. R. China
| | - Yanwei Zhao
- Key Laboratory of Organic Synthesis of Jiangsu Province
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
| | - Hao Zheng
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology
- Advanced Catalysis and Green Manufacturing Collaborative Innovation Center
- Changzhou University
- Changzhou 213164
- P. R. China
| | - Liang Ma
- Key Laboratory of Organic Synthesis of Jiangsu Province
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
| | - Meihua Ma
- Key Laboratory of Organic Synthesis of Jiangsu Province
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
| | - Xiaobing Wan
- Key Laboratory of Organic Synthesis of Jiangsu Province
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
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16
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17
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Saez Talens V, Englebienne P, Trinh TT, Noteborn WEM, Voets IK, Kieltyka RE. Aromatic Gain in a Supramolecular Polymer. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201503905] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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18
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Mohamed RK, Mondal S, Gold B, Evoniuk CJ, Banerjee T, Hanson K, Alabugin IV. Alkenes as Alkyne Equivalents in Radical Cascades Terminated by Fragmentations: Overcoming Stereoelectronic Restrictions on Ring Expansions for the Preparation of Expanded Polyaromatics. J Am Chem Soc 2015; 137:6335-49. [DOI: 10.1021/jacs.5b02373] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Rana K. Mohamed
- Florida State University, Tallahassee, Florida 32306, United States
| | - Sayantan Mondal
- Florida State University, Tallahassee, Florida 32306, United States
| | - Brian Gold
- Florida State University, Tallahassee, Florida 32306, United States
| | | | - Tanmay Banerjee
- Florida State University, Tallahassee, Florida 32306, United States
| | - Kenneth Hanson
- Florida State University, Tallahassee, Florida 32306, United States
| | - Igor V. Alabugin
- Florida State University, Tallahassee, Florida 32306, United States
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19
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Abstract
![]()
1,1-Divinyl-2-phenylcyclopropanes
are entry points to a rich area
of rearrangement chemistry. With N,N-diallyl amide
substrates, tandem radical cyclizations can be initiated at room temperature.
Warming provides products of pure thermal rearrangements with acids,
ester, and amides. These isomerizations give vinylcyclopentenes resulting
from divinylcyclopropane rearrangements and more deeply rearranged
tricyclic spirolactams resulting from aromatic Cope rearrangements
followed by ene reactions. Conversion of the carbonyl group to an
alcohol or ether opens retro-ene pathways followed by either tautomerization
or Claisen rearrangement.
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Affiliation(s)
- E Ben Hay
- Department of Chemistry, University of Pittsburgh , Pittsburgh, Pennsylvania 15260, United States
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20
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Delso I, Melicchio A, Isasi A, Tejero T, Merino P. Evasive Neutral 2-Aza-Cope Rearrangements. Kinetic and Computational Studies with Cyclic Nitrones. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300836] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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21
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Crouch IT, Neff RK, Frantz DE. Pd-catalyzed asymmetric β-hydride elimination en route to chiral allenes. J Am Chem Soc 2013; 135:4970-3. [PMID: 23488914 DOI: 10.1021/ja401606e] [Citation(s) in RCA: 111] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
We wish to report our preliminary results on the discovery and development of a catalytic, asymmetric β-hydride elimination from vinyl Pd(II)-complexes derived from enol triflates to access chiral allenes. To achieve this, we developed a class of chiral phosphite ligands that demonstrate high enantioselectivity, allow access of either allene enantiomer, and are readily synthesized. The methodology is demonstrated on over 20 substrates, and application to the formal asymmetric total synthesis of the natural product, (+)-epibatidine, is also provided.
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Affiliation(s)
- Ian T Crouch
- Department of Chemistry, The University of Texas at San Antonio , San Antonio, Texas 78249, United States
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22
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Zhu H, Shao N, Chen T, Zou H. Functionalized heterocyclic scaffolds derived from Morita–Baylis–Hillman Acetates. Chem Commun (Camb) 2013; 49:7738-40. [DOI: 10.1039/c3cc43285h] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Vidhani DV, Cran JW, Krafft ME, Manoharan M, Alabugin IV. Gold(I)-Catalyzed Claisen Rearrangement of Allenyl Vinyl Ethers: Missing Transition States Revealed through Evolution of Aromaticity, Au(I) as an Oxophilic Lewis Acid, and Lower Energy Barriers from a High Energy Complex. J Org Chem 2012; 78:2059-73. [DOI: 10.1021/jo302152j] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Dinesh V. Vidhani
- Department of Chemistry and
Biochemistry, Florida State University,
Tallahassee, Florida 32306, United States
| | - John W. Cran
- Department of Chemistry and
Biochemistry, Florida State University,
Tallahassee, Florida 32306, United States
| | - Marie E. Krafft
- Department of Chemistry and
Biochemistry, Florida State University,
Tallahassee, Florida 32306, United States
| | - Mariappan Manoharan
- School of Science, Engineering
and Mathematics, Bethune-Cookman University, Daytona Beach, Florida 32114, United States
| | - Igor V. Alabugin
- Department of Chemistry and
Biochemistry, Florida State University,
Tallahassee, Florida 32306, United States
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