1
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Chen W, Seidel D. Condensation-Based Methods for the C-H Bond Functionalization of Amines. SYNTHESIS-STUTTGART 2021; 53:3869-3908. [PMID: 35422533 PMCID: PMC9004714 DOI: 10.1055/a-1631-2140] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
This review aims to provide a comprehensive overview of condensation-based methods for the C-H bond functionalization of amines that feature azomethine ylides as key intermediates. These transformations are typically redox-neutral and share common attributes with classic name reactions such as the Strecker, Mannich, Friedel-Crafts, Pictet-Spengler, and Kabachnik-Fields reaction, while incorporating a redox-isomerization step. This approach provides an ideal platform to rapidly transform simple starting materials into complex amines.
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Affiliation(s)
- Weijie Chen
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
- School of Chemical Science and Engineering, Institute for Advanced Study, Tongji University, 1239 Siping Rd, Shanghai, 200092, P. R. China
| | - Daniel Seidel
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
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2
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Abstract
Amines such as 1,2,3,4-tetrahydroisoquinoline undergo redox-neutral annulations with ortho-(nitromethyl)benzaldehyde. Benzoic acid acts as a promoter in these reactions, which involve concurrent amine α-C-H bond and N-H bond functionalization. Subsequent removal of the nitro group provides access to tetrahydroprotoberberines not accessible via typical redox-annulations. Also reported are decarboxylative annulations of ortho-(nitromethyl)benzaldehyde with proline and pipecolic acid.
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Affiliation(s)
- Dillon R L Rickertsen
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, USA
| | - Longle Ma
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, USA
| | - Anirudra Paul
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, USA
| | - Khalil A Abboud
- Center for X-ray Crystallography, Department of Chemistry, University of Florida, Gainesville, Florida 32611, USA
| | - Daniel Seidel
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, USA
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3
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Rahman I, Deka B, Thakuria R, Deb ML, Baruah PK. L-Proline-catalyzed regioselective C1 arylation of tetrahydroisoquinolines through a multicomponent reaction under solvent-free conditions. Org Biomol Chem 2020; 18:6514-6518. [PMID: 32804185 DOI: 10.1039/d0ob01363c] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Here we disclose the C1 arylation of tetrahydroisoquinolines (THIQ) through regioselective C(sp3)-H functionalization using a multicomponent reaction. The reaction was performed by reacting THIQ, aldehydes and aminopyrazoles or indoles under neat conditions with l-proline as a catalyst. The regioselectivity of the products was confirmed by X-ray analysis and spectroscopic data. The formation of an azomethine ylide intermediate is crucial for obtaining the regioselectivity.
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Affiliation(s)
- Iftakur Rahman
- Department of Applied Sciences, GUIST, Gauhati University, Guwahati-781014, Assam, India.
| | - Bhaskar Deka
- Department of Applied Sciences, GUIST, Gauhati University, Guwahati-781014, Assam, India.
| | - Ranjit Thakuria
- Department of Chemistry, Gauhati University, Guwahati-781014, Assam, India
| | - Mohit L Deb
- Department of Applied Sciences, GUIST, Gauhati University, Guwahati-781014, Assam, India.
| | - Pranjal K Baruah
- Department of Applied Sciences, GUIST, Gauhati University, Guwahati-781014, Assam, India.
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4
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Paul A, Chandak HS, Ma L, Seidel D. Redox-Annulations of Cyclic Amines with ortho-Cyanomethylbenzaldehydes. Org Lett 2020; 22:976-980. [PMID: 31984752 DOI: 10.1021/acs.orglett.9b04506] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Amines such as 1,2,3,4-tetrahydroisoquinoline undergo redox-neutral annulations with ortho-cyanomethylbenzaldehydes. These amine α-C-H bond functionalization reactions are promoted by acetic acid. The resulting β-aminonitriles can be converted to the corresponding β-aminoalcohols in diastereoselective fashion.
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Affiliation(s)
- Anirudra Paul
- Center for Heterocyclic Compounds, Department of Chemistry , University of Florida , Gainesville , Florida 32611 , United States.,Department of Chemistry and Chemical Biology , Rutgers, The State University of New Jersey , Piscataway , New Jersey 08854 , United States
| | - Hemant S Chandak
- Department of Chemistry and Chemical Biology , Rutgers, The State University of New Jersey , Piscataway , New Jersey 08854 , United States
| | - Longle Ma
- Department of Chemistry and Chemical Biology , Rutgers, The State University of New Jersey , Piscataway , New Jersey 08854 , United States
| | - Daniel Seidel
- Center for Heterocyclic Compounds, Department of Chemistry , University of Florida , Gainesville , Florida 32611 , United States.,Department of Chemistry and Chemical Biology , Rutgers, The State University of New Jersey , Piscataway , New Jersey 08854 , United States
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5
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Paul A, Adili A, Seidel D. Redox-Annulations of Cyclic Amines with Electron-Deficient o-Tolualdehydes. Org Lett 2019; 21:1845-1848. [PMID: 30840479 DOI: 10.1021/acs.orglett.9b00438] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Amines such as 1,2,3,4-tetrahydroisoquinoline undergo redox-neutral annulations with 2-methyl-3,5-dinitrobenzaldehyde and closely related substrates. Acetic acid serves as the solvent and sole promoter of these transformations which involve dual C-H functionalization.
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Affiliation(s)
- Anirudra Paul
- Center for Heterocyclic Compounds, Department of Chemistry , University of Florida , Gainesville , Florida 32611 , United States
| | - Alafate Adili
- Center for Heterocyclic Compounds, Department of Chemistry , University of Florida , Gainesville , Florida 32611 , United States
| | - Daniel Seidel
- Center for Heterocyclic Compounds, Department of Chemistry , University of Florida , Gainesville , Florida 32611 , United States
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6
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Abstract
Amines such as 1,2,3,4-tetrahydroisoquinoline undergo redox-neutral annulations with 2-(2-oxoethyl)malonates in the presence of catalytic amounts of benzoic acid. These reactions install a fully saturated five-membered ring and provide access to structures closely related to the natural products crispine A and harmicine.
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Affiliation(s)
- Zhengbo Zhu
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
| | - Hemant S. Chandak
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
| | - Daniel Seidel
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
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7
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Zhu Z, Lv X, Anesini JE, Seidel D. Synthesis of Polycyclic Imidazolidinones via Amine Redox-Annulation. Org Lett 2017; 19:6424-6427. [PMID: 29144764 PMCID: PMC5715285 DOI: 10.1021/acs.orglett.7b03309] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Indexed: 11/30/2022]
Abstract
α-Ketoamides undergo redox-annulations with cyclic secondary amines, such as 1,2,3,4-tetrahydroisoquinoline, pyrrolidine, piperidine, and morpholine. Catalytic amounts of benzoic acid significantly accelerate these transformations. This approach provides polycyclic imidazolidinone derivatives in typically good yields.
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Affiliation(s)
- Zhengbo Zhu
- Department
of Chemistry and Chemical Biology, Rutgers,
The State University of New Jersey, Piscataway, New Jersey 08854, United States
| | - Xin Lv
- Department
of Chemistry and Chemical Biology, Rutgers,
The State University of New Jersey, Piscataway, New Jersey 08854, United States
- Department
of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People’s Republic
of China
| | - Jason E. Anesini
- Department
of Chemistry and Chemical Biology, Rutgers,
The State University of New Jersey, Piscataway, New Jersey 08854, United States
| | - Daniel Seidel
- Department
of Chemistry and Chemical Biology, Rutgers,
The State University of New Jersey, Piscataway, New Jersey 08854, United States
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8
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Zheng K, Zhuang S, You M, Shu W, Wu A, Wu Y. Benzoic Acid-Promoted Intermolecular [3+2] Cycloaddition with Air as the Terminal Oxidant: General Approach toward Pyrrolo[2, 1-a
]isoquinolines. ChemistrySelect 2017. [DOI: 10.1002/slct.201702044] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Kailu Zheng
- Key Laboratory of Pesticide & Chemical Biology, Ministry of Education; College of Chemistry, Central China Normal University, Hubei; Wuhan 430079 P. R. China
| | - Shiyi Zhuang
- Key Laboratory of Pesticide & Chemical Biology, Ministry of Education; College of Chemistry, Central China Normal University, Hubei; Wuhan 430079 P. R. China
| | - Minqi You
- Key Laboratory of Pesticide & Chemical Biology, Ministry of Education; College of Chemistry, Central China Normal University, Hubei; Wuhan 430079 P. R. China
| | - Wenming Shu
- Key Laboratory of Pesticide & Chemical Biology, Ministry of Education; College of Chemistry, Central China Normal University, Hubei; Wuhan 430079 P. R. China
| | - Anxin Wu
- Key Laboratory of Pesticide & Chemical Biology, Ministry of Education; College of Chemistry, Central China Normal University, Hubei; Wuhan 430079 P. R. China
| | - Yandong Wu
- Key Laboratory of Pesticide & Chemical Biology, Ministry of Education; College of Chemistry, Central China Normal University, Hubei; Wuhan 430079 P. R. China
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9
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Affiliation(s)
- Yan Qin
- Key
Laboratory for Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Lihui Zhu
- Key
Laboratory for Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Sanzhong Luo
- Key
Laboratory for Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
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10
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Ma L, Paul A, Breugst M, Seidel D. Redox-Neutral Aromatization of Cyclic Amines: Mechanistic Insights and Harnessing of Reactive Intermediates for Amine α- and β-C-H Functionalization. Chemistry 2016; 22:18179-18189. [PMID: 27712000 DOI: 10.1002/chem.201603839] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Indexed: 01/14/2023]
Abstract
Cyclic amines such as pyrrolidine and piperidine are known to undergo condensations with aldehydes to furnish pyrrole and pyridine derivatives, respectively. A combined experimental and computational study provides detailed insights into the mechanism of pyrrole formation. A number of reactive intermediates (e.g., azomethine ylides, conjugated azomethine ylides, enamines) were intercepted, outlining strategies for circumventing aromatization as a valuable pathway for amine C-H functionalization.
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Affiliation(s)
- Longle Ma
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey, 08854, USA
| | - Anirudra Paul
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey, 08854, USA
| | - Martin Breugst
- Department für Chemie, Universität zu Köln, Greinstraße 4, 50939, Köln, Germany
| | - Daniel Seidel
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey, 08854, USA
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11
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Kumar M, Kaur BP, Chimni SS. 2,4-Dinitrophenol-Catalyzed α-C(sp3
)−H and C(sp)−H Bond Functionalization of Cyclic Amines and Alkynes: Highly Regio-/Diastereoselective Synthesis of α-Alkynyl-3-Amino-2-Oxindoles. Chemistry 2016; 22:9948-52. [DOI: 10.1002/chem.201601222] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Revised: 04/14/2016] [Indexed: 01/03/2023]
Affiliation(s)
- Mukesh Kumar
- Department of Chemistry; U.G.C. Centre of Advance Studies in Chemistry; Guru Nanak Dev University Amritsar; 143005 Amritsar India
| | - Banni P. Kaur
- Department of Chemistry; U.G.C. Centre of Advance Studies in Chemistry; Guru Nanak Dev University Amritsar; 143005 Amritsar India
| | - Swapandeep S Chimni
- Department of Chemistry; U.G.C. Centre of Advance Studies in Chemistry; Guru Nanak Dev University Amritsar; 143005 Amritsar India
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12
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Kang Y, Richers MT, Sawicki CH, Seidel D. C-H functionalization of cyclic amines: redox-annulations with α,β-unsaturated carbonyl compounds. Chem Commun (Camb) 2016; 51:10648-51. [PMID: 26051897 DOI: 10.1039/c5cc03390j] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Cyclic amines such as pyrrolidine and 1,2,3,4-tetrahydroisoquinoline undergo redox-annulations with α,β-unsaturated aldehydes and ketones. Carboxylic acid promoted generation of a conjugated azomethine ylide is followed by 6π-electrocylization, and, in some cases, tautomerization. The resulting ring-fused pyrrolines are readily oxidized to the corresponding pyrroles or reduced to pyrrolidines.
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Affiliation(s)
- YoungKu Kang
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, USA.
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13
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Saito K, Akiyama T. Chiral Phosphoric Acid Catalyzed Kinetic Resolution of Indolines Based on a Self-Redox Reaction. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201510692] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Kodai Saito
- Department of Chemistry; Gakushuin University; 1-5-1 Mejiro, Toshima-ku Tokyo 171-8588 Japan
- Department of Chemistry; Keio University, Hiyoshi, Kohoku-ku; Yokohama Kanagawa 223-8522 Japan
| | - Takahiko Akiyama
- Department of Chemistry; Gakushuin University; 1-5-1 Mejiro, Toshima-ku Tokyo 171-8588 Japan
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14
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Saito K, Akiyama T. Chiral Phosphoric Acid Catalyzed Kinetic Resolution of Indolines Based on a Self-Redox Reaction. Angew Chem Int Ed Engl 2016; 55:3148-52. [PMID: 26822188 DOI: 10.1002/anie.201510692] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Indexed: 11/12/2022]
Abstract
A strategy for oxidative kinetic resolution of racemic indolines was developed, employing salicylaldehyde derivative as the pre-resolving reagent and chiral phosphoric acid as the catalyst. The iminium intermediate, formed by the condensation reaction of an enantiomer of indoline with salicylaldehyde derivative, was hydrogenated by the same enantiomer of indoline to afford another enantiomer of indoline by a self-redox mechanism. The oxidative kinetic resolution of 2-aryl-substituted indolines proceeded to give enantiomers in good yields with excellent enantioselectivities.
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Affiliation(s)
- Kodai Saito
- Department of Chemistry, Gakushuin University, 1-5-1 Mejiro, Toshima-ku, Tokyo, 171-8588, Japan.,Department of Chemistry, Keio University, Hiyoshi, Kohoku-ku, Yokohama, Kanagawa, 223-8522, Japan
| | - Takahiko Akiyama
- Department of Chemistry, Gakushuin University, 1-5-1 Mejiro, Toshima-ku, Tokyo, 171-8588, Japan.
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15
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Abstract
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Cyclic amines such as 1,2,3,4-tetrahydroisoquinoline
undergo regiodivergent
annulation reactions with 4-nitrobutyraldehydes. These redox-neutral
transformations enable the asymmetric synthesis of highly substituted
polycyclic ring systems in just two steps from commercial materials.
The utility of this process is illustrated in a rapid synthesis of
(−)-protoemetinol. Computational studies provide mechanistic
insights and implicate the elimination of acetic acid from an ammonium
nitronate intermediate as the rate-determining step.
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Affiliation(s)
- YoungKu Kang
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey , Piscataway, New Jersey 08854, United States
| | - Weijie Chen
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey , Piscataway, New Jersey 08854, United States
| | - Martin Breugst
- Department für Chemie, Universität zu Köln , Greinstraße 4, 50939 Köln, Germany
| | - Daniel Seidel
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey , Piscataway, New Jersey 08854, United States
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16
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Haldar S, Roy SK, Maity B, Koley D, Jana CK. Regio- and Diastereoselective and Enantiospecific Metal-Free C(sp3)H Arylation: Facile Access to Optically Active 5-Aryl 2,5-Disubstituted Pyrrolidines. Chemistry 2015; 21:15290-8. [DOI: 10.1002/chem.201502297] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2015] [Indexed: 12/12/2022]
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17
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Aydin O, Kilic H, Bayindir S, Erdogan E, Saracoglu N. Redox Amination Scope of Benzylic Ketones with Indoline: Synthetic and Mechanistic Insights. J Heterocycl Chem 2015. [DOI: 10.1002/jhet.2457] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Omer Aydin
- Department of Chemistry, Faculty of Sciences; Atatürk University; Erzurum 25240 Turkey
| | - Haydar Kilic
- Department of Chemistry, Faculty of Sciences; Atatürk University; Erzurum 25240 Turkey
| | - Sinan Bayindir
- Department of Chemistry, Faculty of Sciences; Atatürk University; Erzurum 25240 Turkey
- Department of Chemistry, Faculty of Arts and Sciences; Bingöl University; Bingöl 12000 Turkey
| | - Esra Erdogan
- Department of Chemistry, Faculty of Sciences; Atatürk University; Erzurum 25240 Turkey
| | - Nurullah Saracoglu
- Department of Chemistry, Faculty of Sciences; Atatürk University; Erzurum 25240 Turkey
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18
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Affiliation(s)
- Takahiko Akiyama
- Department
of Chemistry, Faculty of Science, Gakushuin University, 1-5-1 Mejiro, Toshima-ku, Tokyo 171-8588, Japan
| | - Keiji Mori
- Department
of Chemistry, Faculty of Science, Gakushuin University, 1-5-1 Mejiro, Toshima-ku, Tokyo 171-8588, Japan
- Department
of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho Koganei, Tokyo 184-8588, Japan
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19
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Platonova AY, Seidel D. The Rügheimer-Burrows reaction revisited: Facile preparation of 4-alkylisoquinolines and 3,5-dialkylpyridines from (partially) saturated amines. Tetrahedron Lett 2015. [PMID: 26207074 DOI: 10.1016/j.tetlet.2014.11.137] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
A long-known class of cyclic amine/aldehyde condensation reactions was reinvestigated. Benzoic acid was found to efficiently promote condensations of amines such as piperidine or 1,2,3,4-tetrahydroisoquinoline with aromatic aldehydes, resulting in amine β-functionalization and aromatization. These redox-neutral transformations provide 3,5-dialkylpyridines and 4-alkylisoquinolines in moderate to good yields, following short reaction times under microwave conditions.
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Affiliation(s)
- Alena Yu Platonova
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States ; Department of Organic Synthesis Technology, Ural Federal University, Yekaterinburg, 620002, Russia
| | - Daniel Seidel
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
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20
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Zhen L, Lin C, Du HJ, Dai L, Wen X, Xu QL, Sun H. Quinone methides as [1, 5]-hydride acceptors: approach to N-aryl pyrroles. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.03.077] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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21
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Seidel D. The azomethine ylide route to amine C-H functionalization: redox-versions of classic reactions and a pathway to new transformations. Acc Chem Res 2015; 48:317-28. [PMID: 25560649 PMCID: PMC4334269 DOI: 10.1021/ar5003768] [Citation(s) in RCA: 188] [Impact Index Per Article: 20.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
![]()
Redox-neutral
methods for the functionalization of amine α-C–H
bonds are inherently efficient because they avoid external oxidants
and reductants and often do not generate unwanted byproducts. However,
most of the current methods for amine α-C–H bond functionalization
are oxidative in nature. While the most efficient variants utilize
atmospheric oxygen as the terminal oxidant, many such transformations
require the use of expensive or toxic oxidants, often coupled with
the need for transition metal catalysts. Redox-neutral amine
α-functionalizations that involve intramolecular
hydride transfer steps provide viable alternatives to certain oxidative
reactions. These processes have been known for some time and are particularly
well suited for tertiary amine substrates. A mechanistically distinct
strategy for secondary amines has emerged only recently, despite sharing
common features with a range of classic organic transformations. Among
those are such widely used reactions as the Strecker, Mannich, Pictet–Spengler,
and Kabachnik–Fields reactions, Friedel–Crafts alkylations,
and iminium alkynylations. In these classic processes, condensation
of a secondary amine with an aldehyde (or a ketone) typically leads
to the formation of an intermediate iminium ion, which is subsequently
attacked by a nucleophile. The corresponding redox-versions of these
transformations utilize identical starting materials but incorporate
an isomerization step that enables α-C–H bond functionalization.
Intramolecular versions of these reactions include redox-neutral amine α-amination,
α-oxygenation, and α-sulfenylation. In all cases, a reductive
N-alkylation is effectively combined with an oxidative α-functionalization,
generating water as the only byproduct. Reactions are promoted
by simple carboxylic acids and in some cases
require no additives. Azomethine ylides, dipolar species whose usage
is predominantly in [3 + 2] cycloadditions and other pericyclic processes,
have been identified as common intermediates. Extension of this chemistry
to amine α,β-difunctionalization has been shown to be
possible by way of converting the intermediate azomethine ylides into
transient enamines. This Account details the evolution of this
general strategy and
the progress made to date. Further included is a discussion of related
decarboxylative reactions and transformations that result in the redox-neutral
aromatization of (partially) saturated cyclic amines. These processes
also involve azomethine ylides, reactive intermediates that appear
to be far more prevalent in condensation chemistry of amines and carbonyl
compounds than previously considered. In contrast, as exemplified
by some redox transformations that have been studied in greater detail,
iminium ions are not necessarily involved in all amine/aldehyde condensation
reactions.
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Affiliation(s)
- Daniel Seidel
- Department of Chemistry and
Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
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22
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Bayindir S, Erdogan E, Kilic H, Aydin O, Saracoglu N. Synthesis ofN-Alkylated Indolines and Indoles from Indoline and Aliphatic Ketones. J Heterocycl Chem 2015. [DOI: 10.1002/jhet.2337] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Sinan Bayindir
- Department of Chemistry, Faculty of Sciences; Atatürk University; Erzurum 25240 Turkey
- Department of Chemistry, Faculty of Sciences and Arts; Bingöl University; Bingöl 12000 Turkey
| | - Esra Erdogan
- Department of Chemistry, Faculty of Sciences; Atatürk University; Erzurum 25240 Turkey
| | - Haydar Kilic
- Department of Chemistry, Faculty of Sciences; Atatürk University; Erzurum 25240 Turkey
| | - Omer Aydin
- Department of Chemistry, Faculty of Sciences; Atatürk University; Erzurum 25240 Turkey
| | - Nurullah Saracoglu
- Department of Chemistry, Faculty of Sciences; Atatürk University; Erzurum 25240 Turkey
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23
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Pavan Kumar CS, Harsha KB, Sandhya NC, Ramesha AB, Mantelingu K, Rangappa KS. Highly diastereoselective synthesis of polycyclic amines via redox neutral C–H functionalization. NEW J CHEM 2015. [DOI: 10.1039/c5nj01706h] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Construction of polycyclic amines via C–H functionalization and 3+2 cycloaddition with high diastereoselectivities was achieved under mild conditions.
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24
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Mantelingu K, Lin Y, Seidel D. Intramolecular [3 + 2]-cycloadditions of azomethine ylides derived from secondary amines via redox-neutral C-H functionalization. Org Lett 2014; 16:5910-3. [PMID: 25413125 PMCID: PMC4251528 DOI: 10.1021/ol502918g] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2014] [Indexed: 12/17/2022]
Abstract
Azomethine ylides are accessed under mild conditions via benzoic acid catalyzed condensations of 1,2,3,4-tetrahydroisoquinolines or tryptolines with aldehydes bearing a pendent dipolarophile. These intermediates undergo intramolecular [3 + 2]-cycloadditions in a highly diastereoselective fashion to form polycyclic amines with four new stereogenic centers. Challenging substrates such as piperidine, morpholine, and thiomorpholine undergo the corresponding reactions at elevated temperatures.
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Affiliation(s)
- Kempegowda Mantelingu
- Department of Chemistry and
Chemical Biology, Rutgers, The State University
of New Jersey, Piscataway, New Jersey 08854, United States
| | - Yingfu Lin
- Department of Chemistry and
Chemical Biology, Rutgers, The State University
of New Jersey, Piscataway, New Jersey 08854, United States
| | - Daniel Seidel
- Department of Chemistry and
Chemical Biology, Rutgers, The State University
of New Jersey, Piscataway, New Jersey 08854, United States
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25
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Wu X, Chen SS, Hu Y, Gong LZ. Gold-Catalyzed [1,5]-Hydride Shift onto Unactivated Alkynes To Trigger an Intermolecular Diels–Alder Reaction. Org Lett 2014; 16:3820-3. [DOI: 10.1021/ol5017355] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xiang Wu
- Hefei National Laboratory
for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China
| | - Shu-Sen Chen
- Hefei National Laboratory
for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China
| | - Yue Hu
- Hefei National Laboratory
for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China
| | - Liu-Zhu Gong
- Hefei National Laboratory
for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China
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26
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Jarvis CL, Richers MT, Breugst M, Houk KN, Seidel D. Redox-neutral α-sulfenylation of secondary amines: ring-fused N,S-acetals. Org Lett 2014; 16:3556-9. [PMID: 24927364 PMCID: PMC4096192 DOI: 10.1021/ol501509b] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
![]()
Secondary amines react with thiosalicylaldehydes
in the presence
of catalytic amounts of acetic acid to generate ring-fused N,S-acetals in redox-neutral fashion. A
broad range of amines undergo α-sulfenylation, including challenging
substrates such morpholine, thiomorpholine, and piperazines. Computational
studies employing density functional theory indicate that acetic acid
reduces the energy barriers of two separate steps, both of which involve
proton transfer.
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Affiliation(s)
- Claire L Jarvis
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey , Piscataway, New Jersey 08854, United States
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27
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Abstract
A complement to the classic three-component Mannich reaction, the redox-Mannich reaction, utilizes the same starting materials but incorporates an isomerization step that enables the facile preparation of ring-substituted β-amino ketones. Reactions occur under relatively mild conditions and are facilitated by benzoic acid.
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Affiliation(s)
- Weijie Chen
- Department
of Chemistry and
Chemical Biology, Rutgers, The State University
of New Jersey, Piscataway, New Jersey 08854, United States
| | - Daniel Seidel
- Department
of Chemistry and
Chemical Biology, Rutgers, The State University
of New Jersey, Piscataway, New Jersey 08854, United States
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28
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Chen W, Kang Y, Wilde RG, Seidel D. Redox-neutral α,β-difunctionalization of cyclic amines. Angew Chem Int Ed Engl 2014; 53:5179-82. [PMID: 24692162 PMCID: PMC4068263 DOI: 10.1002/anie.201311165] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2013] [Indexed: 11/06/2022]
Abstract
In contrast to the continuously growing number of methods that allow for the efficient α-functionalization of amines, few strategies exist that enable the direct functionalization of amines in the β-position. A general redox-neutral strategy is outlined for amine β-functionalization and α,β-difunctionalization that utilizes enamines generated in situ. This concept is demonstrated in the context of preparing polycyclic N,O-acetals from simple 1-(aminomethyl)-β-naphthols and 2-(aminomethyl)-phenols.
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Affiliation(s)
- Weijie Chen
- Department of Chemistry and Chemical Biology, Rutgers, The State university of New Jersey, Piscataway, New Jersey 08854 (USA), Phone: (+1) 732-445-6921, Homepage: http://seidel-group.com/
| | - YoungKu Kang
- Department of Chemistry and Chemical Biology, Rutgers, The State university of New Jersey, Piscataway, New Jersey 08854 (USA), Phone: (+1) 732-445-6921, Homepage: http://seidel-group.com/
| | - Richard G. Wilde
- Department of Chemistry and Chemical Biology, Rutgers, The State university of New Jersey, Piscataway, New Jersey 08854 (USA), Phone: (+1) 732-445-6921, Homepage: http://seidel-group.com/
| | - Daniel Seidel
- Department of Chemistry and Chemical Biology, Rutgers, The State university of New Jersey, Piscataway, New Jersey 08854 (USA), Phone: (+1) 732-445-6921, Homepage: http://seidel-group.com/
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29
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Yang C, Xue XS, Li X, Cheng JP. Computational Study on the Acidic Constants of Chiral Brønsted Acids in Dimethyl Sulfoxide. J Org Chem 2014; 79:4340-51. [DOI: 10.1021/jo500158e] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Chen Yang
- State Key
Laboratory of Elemento-Organic
Chemistry, Department of Chemistry, and Collaborative Innovation Center
of Chemical Science and Engineering, Nankai University, Tianjin 300071, China
| | - Xiao-Song Xue
- State Key
Laboratory of Elemento-Organic
Chemistry, Department of Chemistry, and Collaborative Innovation Center
of Chemical Science and Engineering, Nankai University, Tianjin 300071, China
| | - Xin Li
- State Key
Laboratory of Elemento-Organic
Chemistry, Department of Chemistry, and Collaborative Innovation Center
of Chemical Science and Engineering, Nankai University, Tianjin 300071, China
| | - Jin-Pei Cheng
- State Key
Laboratory of Elemento-Organic
Chemistry, Department of Chemistry, and Collaborative Innovation Center
of Chemical Science and Engineering, Nankai University, Tianjin 300071, China
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30
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Richers M, Breugst M, Platonova AY, Ullrich A, Dieckmann A, Houk KN, Seidel D. Redox-neutral α-oxygenation of amines: reaction development and elucidation of the mechanism. J Am Chem Soc 2014; 136:6123-35. [PMID: 24689802 PMCID: PMC4333595 DOI: 10.1021/ja501988b] [Citation(s) in RCA: 114] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2014] [Indexed: 12/19/2022]
Abstract
Cyclic secondary amines and 2-hydroxybenzaldehydes or related ketones react to furnish benzo[e][1,3]oxazine structures in generally good yields. This overall redox-neutral amine α-C-H functionalization features a combined reductive N-alkylation/oxidative α-functionalization and is catalyzed by acetic acid. In contrast to previous reports, no external oxidants or metal catalysts are required. Reactions performed under modified conditions lead to an apparent reductive amination and the formation of o-hydroxybenzylamines in a process that involves the oxidation of a second equivalent of amine. A detailed computational study employing density functional theory compares different mechanistic pathways and is used to explain the observed experimental findings. Furthermore, these results also reveal the origin of the catalytic efficiency of acetic acid in these transformations.
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Affiliation(s)
- Matthew
T. Richers
- Department
of Chemistry and Chemical Biology, Rutgers,
The State University of New Jersey, Piscataway, New Jersey 08854, United States
| | - Martin Breugst
- Department
of Chemistry and Biochemistry, University
of California, Los Angeles, California 90095, United States
- Department
für Chemie, Universität zu
Köln, Greinstraße
4, 50939 Köln, Germany
| | - Alena Yu. Platonova
- Department
of Chemistry and Chemical Biology, Rutgers,
The State University of New Jersey, Piscataway, New Jersey 08854, United States
- Department
of Organic Synthesis Technology, Ural Federal
University, Yekaterinburg 620002, Russia
| | - Anja Ullrich
- Department
of Chemistry and Biochemistry, University
of California, Los Angeles, California 90095, United States
- Institut
für Bioorganische Chemie, Heinrich-Heine
Universität Düsseldorf, Stetternicher Forst, 52426 Jülich, Germany
| | - Arne Dieckmann
- Department
of Chemistry and Biochemistry, University
of California, Los Angeles, California 90095, United States
| | - K. N. Houk
- Department
of Chemistry and Biochemistry, University
of California, Los Angeles, California 90095, United States
| | - Daniel Seidel
- Department
of Chemistry and Chemical Biology, Rutgers,
The State University of New Jersey, Piscataway, New Jersey 08854, United States
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31
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Chen W, Kang Y, Wilde RG, Seidel D. Redox-Neutral α,β-Difunctionalization of Cyclic Amines. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201311165] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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32
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Qu S, Dang Y, Song C, Wen M, Huang KW, Wang ZX. Catalytic Mechanisms of Direct Pyrrole Synthesis via Dehydrogenative Coupling Mediated by PNP-Ir or PNN-Ru Pincer Complexes: Crucial Role of Proton-Transfer Shuttles in the PNP-Ir System. J Am Chem Soc 2014; 136:4974-91. [DOI: 10.1021/ja411568a] [Citation(s) in RCA: 151] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Shuanglin Qu
- School
of Chemistry and Chemical Engineering, University of the Chinese Academy of Sciences, Beijing, 100049, China
| | - Yanfeng Dang
- School
of Chemistry and Chemical Engineering, University of the Chinese Academy of Sciences, Beijing, 100049, China
| | - Chunyu Song
- School
of Chemistry and Chemical Engineering, University of the Chinese Academy of Sciences, Beijing, 100049, China
| | - Mingwei Wen
- School
of Chemistry and Chemical Engineering, University of the Chinese Academy of Sciences, Beijing, 100049, China
| | - Kuo-Wei Huang
- KAUST
Catalysis Center and Division of Physical Science and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Zhi-Xiang Wang
- School
of Chemistry and Chemical Engineering, University of the Chinese Academy of Sciences, Beijing, 100049, China
- Collaborative
Innovation Center of Chemical Science and Engineering, Tianjin, 300072, China
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33
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Affiliation(s)
- Xiang Ni
- State Key
Laboratory of Elemento-Organic
Chemistry, Department of Chemistry, Nankai University, and Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300071, China
| | - Xin Li
- State Key
Laboratory of Elemento-Organic
Chemistry, Department of Chemistry, Nankai University, and Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300071, China
| | - Zhen Wang
- State Key
Laboratory of Elemento-Organic
Chemistry, Department of Chemistry, Nankai University, and Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300071, China
| | - Jin-Pei Cheng
- State Key
Laboratory of Elemento-Organic
Chemistry, Department of Chemistry, Nankai University, and Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300071, China
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34
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Abstract
The direct α-arylation/N-alkylation of cyclic amines was achieved in a redox-neutral fashion under mild conditions. Transformations occur in the absence of any additives or are promoted by simple carboxylic acids.
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Affiliation(s)
- Weijie Chen
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, United States
| | - Richard G. Wilde
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, United States
| | - Daniel Seidel
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, United States
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35
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Xue XS, Yang C, Li X, Cheng JP. Computational Study on the pKa Shifts in Proline Induced by Hydrogen-Bond-Donating Cocatalysts. J Org Chem 2014; 79:1166-73. [DOI: 10.1021/jo402605n] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Xiao-Song Xue
- State Key Laboratory of Elemento-Organic
Chemistry, Collaborative Innovation Center of Chemical Science and
Engineering, Department of Chemistry, Nankai University, Tianjin 300071, China
| | - Chen Yang
- State Key Laboratory of Elemento-Organic
Chemistry, Collaborative Innovation Center of Chemical Science and
Engineering, Department of Chemistry, Nankai University, Tianjin 300071, China
| | - Xin Li
- State Key Laboratory of Elemento-Organic
Chemistry, Collaborative Innovation Center of Chemical Science and
Engineering, Department of Chemistry, Nankai University, Tianjin 300071, China
| | - Jin-Pei Cheng
- State Key Laboratory of Elemento-Organic
Chemistry, Collaborative Innovation Center of Chemical Science and
Engineering, Department of Chemistry, Nankai University, Tianjin 300071, China
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36
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37
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Xue XS, Li X, Yu A, Yang C, Song C, Cheng JP. Mechanism and Selectivity of Bioinspired Cinchona Alkaloid Derivatives Catalyzed Asymmetric Olefin Isomerization: A Computational Study. J Am Chem Soc 2013; 135:7462-73. [DOI: 10.1021/ja309133z] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Xiao-Song Xue
- State
Key Laboratory of Elemento-Organic Chemistry, §Computational Center of Molecular
Science, and ‡Central Laboratory, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Xin Li
- State
Key Laboratory of Elemento-Organic Chemistry, §Computational Center of Molecular
Science, and ‡Central Laboratory, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Ao Yu
- State
Key Laboratory of Elemento-Organic Chemistry, §Computational Center of Molecular
Science, and ‡Central Laboratory, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Chen Yang
- State
Key Laboratory of Elemento-Organic Chemistry, §Computational Center of Molecular
Science, and ‡Central Laboratory, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Chan Song
- State
Key Laboratory of Elemento-Organic Chemistry, §Computational Center of Molecular
Science, and ‡Central Laboratory, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Jin-Pei Cheng
- State
Key Laboratory of Elemento-Organic Chemistry, §Computational Center of Molecular
Science, and ‡Central Laboratory, College of Chemistry, Nankai University, Tianjin 300071, China
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38
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Zhao P, Liao Q, Gao H, Xi C. Protonated DBU as catalyst for cascade addition–cyclization of 2-alkynylaniline and carbon disulfide. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.02.074] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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39
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Dieckmann A, Richers MT, Platonova AY, Zhang C, Seidel D, Houk KN. Metal-free α-amination of secondary amines: computational and experimental evidence for azaquinone methide and azomethine ylide intermediates. J Org Chem 2013; 78:4132-44. [PMID: 23517448 PMCID: PMC3654248 DOI: 10.1021/jo400483h] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
We have performed a combined computational and experimental study to elucidate the mechanism of a metal-free α-amination of secondary amines. Calculations predicted azaquinone methides and azomethine ylides as the reactive intermediates and showed that iminium ions are unlikely to participate in these transformations. These results were confirmed by experimental deuterium-labeling studies and the successful trapping of the postulated azomethine ylide and azaquinone methide intermediates. In addition, computed barrier heights for the rate-limiting step correlate qualitatively with experimental findings.
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Affiliation(s)
- Arne Dieckmann
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Matthew T. Richers
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
| | - Alena Yu. Platonova
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
- Department of Organic Synthesis Technology, Ural Federal University, Yekaterinburg, 620002, Russia
| | - Chen Zhang
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
| | - Daniel Seidel
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
| | - K. N. Houk
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
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40
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Das D, Sun AX, Seidel D. Redox-neutral copper(II) carboxylate catalyzed α-alkynylation of amines. Angew Chem Int Ed Engl 2013; 52:3765-9. [PMID: 23440869 PMCID: PMC3774004 DOI: 10.1002/anie.201300021] [Citation(s) in RCA: 90] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2013] [Indexed: 11/08/2022]
Abstract
A new strategy for iminium ion isomerization was applied to the direct, redox-neutral α-alkynylation of amines. Cu(II) 2-ethylhexanoate was identified as the optimal catalyst for this three-component coupling reaction of secondary amines, aldehydes and alkynes.
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Affiliation(s)
- Deepankar Das
- Department of Chemistry and Chemical Biology, Rutgers, The State university of New Jersey, Piscataway, New Jersey 08854 (USA), Phone: (+1) 732-445-6921, Homepage: http://seidel-group.com/
| | - Aaron X. Sun
- Department of Chemistry and Chemical Biology, Rutgers, The State university of New Jersey, Piscataway, New Jersey 08854 (USA), Phone: (+1) 732-445-6921, Homepage: http://seidel-group.com/
| | - Daniel Seidel
- Department of Chemistry and Chemical Biology, Rutgers, The State university of New Jersey, Piscataway, New Jersey 08854 (USA), Phone: (+1) 732-445-6921, Homepage: http://seidel-group.com/
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41
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Das D, Sun AX, Seidel D. Redox-Neutral Copper(II) Carboxylate Catalyzed α-Alkynylation of Amines. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201300021] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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42
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Abstract
α-Aminonitriles inaccessible by traditional Strecker chemistry are obtained in redox-neutral fashion by direct amine α-cyanation/N-alkylation or alternatively, α-aminonitrile isomerization. These unprecedented transformations are catalyzed by simple carboxylic acids.
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Affiliation(s)
- Longle Ma
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, USA
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43
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Pan SC. Organocatalytic C-H activation reactions. Beilstein J Org Chem 2012; 8:1374-84. [PMID: 23019474 PMCID: PMC3458764 DOI: 10.3762/bjoc.8.159] [Citation(s) in RCA: 125] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2012] [Accepted: 07/31/2012] [Indexed: 12/24/2022] Open
Abstract
Organocatalytic C-H activation reactions have recently been developed besides the traditional metal-catalysed C-H activation reactions. The recent non-asymmetric and asymmetric C-H activation reactions mediated by organocatalysts are discussed in this review.
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Affiliation(s)
- Subhas Chandra Pan
- Department of Chemistry, Indian Institute of Technology Guwahati, North Guwahati, Assam, 781039, India
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