1
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Nagao K, Ohmiya H. Carbocation Generation by Organophotoredox Catalysis. J SYN ORG CHEM JPN 2021. [DOI: 10.5059/yukigoseikyokaishi.79.1005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Kazunori Nagao
- Division of Pharmaceutical Sciences, Graduate School of Medical Sciences, Kanazawa University
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2
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Guin S, Majee D, Samanta S. Unmasking the reverse reactivity of cyclic N-sulfonyl ketimines: multifaceted applications in organic synthesis. Chem Commun (Camb) 2021; 57:9010-9028. [PMID: 34498642 DOI: 10.1039/d1cc03439a] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
The chemistry related to the exploration of cyclic N-sulfonyl ketimines and their derivatives has attracted significant attention in the last few decades because of their intriguing structures and properties. They serve broadly as reactive synthons in various reactions to create a diverse set of synthetically and biologically attractive molecules. Furthermore, these moieties, which possess multiple heteroatoms (N, O and S), display or can enhance many biological activities. In the case of synthetic reactions, chemists mainly focus on the chemical manipulation of the highly reactive prochiral CN bond of N-sulfonyl ketimines. Besides their traditional role as electrophiles, N-sulfonyl ketimines possess α-Csp3-H protons, and thus behave as potential carbonucleophiles, where they can undergo several C-X (X = C, N and O) bond-forming reactions with different types of electrophiles under various conditions to form a wide range of fascinating asymmetric and non-asymmetric versions of fused heterocycles, carbocycles, spiro-fused skeletons, pyridines, pyrroles, etc. Herein, we highlight the recent examples from our research work and others covering the scope of cyclic N-sulfonyl ketimines as useful carbonucleophiles. In addition, the detailed mechanistic studies of the above-mentioned reactions are also presented.
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Affiliation(s)
- Soumitra Guin
- Department of Chemistry, Indian Institute of Technology Indore, Simrol, Indore, 453552, India.
| | - Debashis Majee
- Department of Chemistry, Indian Institute of Technology Indore, Simrol, Indore, 453552, India.
| | - Sampak Samanta
- Department of Chemistry, Indian Institute of Technology Indore, Simrol, Indore, 453552, India.
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3
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Kobayashi R, Shibutani S, Nagao K, Ikeda Z, Wang J, Ibáñez I, Reynolds M, Sasaki Y, Ohmiya H. Decarboxylative N-Alkylation of Azoles through Visible-Light-Mediated Organophotoredox Catalysis. Org Lett 2021; 23:5415-5419. [PMID: 34139122 DOI: 10.1021/acs.orglett.1c01745] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
An organophotoredox-catalyzed decarboxylative cross-coupling between azole nucleophiles and aliphatic carboxylic acid-derived redox-active esters is demonstrated. This protocol efficiently installs various tertiary or secondary alkyl fragments onto the nitrogen atom of azole nucleophiles under mild and transition-metal-free conditions. The pyridinium additive successfully inhibits the formation of elimination byproducts from the carbocation intermediate. This reaction is applicable to the synthesis of a protein-degrader-like molecule containing an azole and a thalidomide.
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Affiliation(s)
- Rino Kobayashi
- Division of Pharmaceutical Sciences, Graduate School of Medical Sciences, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | - Shotaro Shibutani
- Division of Pharmaceutical Sciences, Graduate School of Medical Sciences, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | - Kazunori Nagao
- Division of Pharmaceutical Sciences, Graduate School of Medical Sciences, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | - Zenichi Ikeda
- Research, Takeda Pharmaceutical Company Limited, 2-26-1 Muraoka-Higashi, Fujisawa, Kanagawa 251-8555, Japan
| | - Junsi Wang
- Research, Takeda Pharmaceutical Company Limited, 2-26-1 Muraoka-Higashi, Fujisawa, Kanagawa 251-8555, Japan
| | - Ignacio Ibáñez
- Research, Takeda Pharmaceutical Company Limited, 2-26-1 Muraoka-Higashi, Fujisawa, Kanagawa 251-8555, Japan
| | - Matthew Reynolds
- Research, Takeda Pharmaceutical Company Limited, 2-26-1 Muraoka-Higashi, Fujisawa, Kanagawa 251-8555, Japan
| | - Yusuke Sasaki
- Research, Takeda Pharmaceutical Company Limited, 2-26-1 Muraoka-Higashi, Fujisawa, Kanagawa 251-8555, Japan
| | - Hirohisa Ohmiya
- Division of Pharmaceutical Sciences, Graduate School of Medical Sciences, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan.,JST, PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
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4
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Zhou J, Tan D, Han F. A Divergent Enantioselective Total Synthesis of Post‐Iboga Indole Alkaloids. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202008242] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Jie Zhou
- CAS Key Lab of High-Performance Synthetic Rubber and its Composite Materials Changchun Institute of Applied Chemistry Chinese Academy of Sciences 5625 Remin Street Changchun Jilin 130022 China
- The University of Chinese Academy of Sciences Beijing 100864 China
| | - Dong‐Xing Tan
- CAS Key Lab of High-Performance Synthetic Rubber and its Composite Materials Changchun Institute of Applied Chemistry Chinese Academy of Sciences 5625 Remin Street Changchun Jilin 130022 China
- University of Science and Technology of China Hefei Anhui 230026 China
| | - Fu‐She Han
- CAS Key Lab of High-Performance Synthetic Rubber and its Composite Materials Changchun Institute of Applied Chemistry Chinese Academy of Sciences 5625 Remin Street Changchun Jilin 130022 China
- University of Science and Technology of China Hefei Anhui 230026 China
- Key Lab of Synthetic Chemistry of Natural Substances Shanghai Institute of Organic Chemistry Chinese Academy of Sciences Shanghai 200032 China
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5
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Zhou J, Tan DX, Han FS. A Divergent Enantioselective Total Synthesis of Post-Iboga Indole Alkaloids. Angew Chem Int Ed Engl 2020; 59:18731-18740. [PMID: 32614122 DOI: 10.1002/anie.202008242] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Indexed: 11/05/2022]
Abstract
Divergent enantioselective total syntheses of five naturally occurring post-iboga indole alkaloids, dippinine B and C, 10,11-demethoxychippiine, 3-O-methyl-10,11-demethoxychippiine, and 3-hydroxy-3,4-secocoronaridine, as well as the two analogues 11-demethoxydippinine A and D, are presented for the first time. The enantioenriched aza[3.3.1]-bridged cycle, a common core intermediate to the target molecules, was constructed through an asymmetric phase-transfer-catalyzed Michael/aldol cascade reaction. The challenging azepane ring fused around the indole ring and the [3.3.1]-bridged cycle were installed through an intramolecular SN 2'-type reaction. These cyclization strategies enabled rapid construction of the [6.5.6.6.7]-pentacyclic core at an early stage. Highlights of the late-stage synthetic steps include a Pd-catalyzed Stille coupling and a highly stereoselective catalyst-controlled hydrogenation to incorporate the side chain at C20 with both R and S configurations in the natural products.
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Affiliation(s)
- Jie Zhou
- CAS Key Lab of High-Performance Synthetic Rubber and its Composite Materials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Remin Street, Changchun, Jilin, 130022, China.,The University of Chinese Academy of Sciences, Beijing, 100864, China
| | - Dong-Xing Tan
- CAS Key Lab of High-Performance Synthetic Rubber and its Composite Materials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Remin Street, Changchun, Jilin, 130022, China.,University of Science and Technology of China, Hefei, Anhui, 230026, China
| | - Fu-She Han
- CAS Key Lab of High-Performance Synthetic Rubber and its Composite Materials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Remin Street, Changchun, Jilin, 130022, China.,University of Science and Technology of China, Hefei, Anhui, 230026, China.,Key Lab of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, 200032, China
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6
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Navo CD, Mazo N, Oroz P, Gutiérrez-Jiménez MI, Marín J, Asenjo J, Avenoza A, Busto JH, Corzana F, Zurbano MM, Jiménez-Osés G, Peregrina JM. Synthesis of Nβ-Substituted α,β-Diamino Acids via Stereoselective N-Michael Additions to a Chiral Bicyclic Dehydroalanine. J Org Chem 2020; 85:3134-3145. [PMID: 32040912 DOI: 10.1021/acs.joc.9b03020] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The highly diastereoselective 1,4-conjugate additions of several nitrogen nucleophiles to chiral bicyclic dehydroalanines have been assessed effectively at room temperature in good to excellent yields without needing any catalyst or additional base. This methodology is general, simple, oxygen and moisture tolerant, high-yielding, totally chemo- and stereoselective. This procedure offers an efficient and practical approach for the synthesis of Nβ-substituted α,β-diamino acids, such as 1-isohistidine, τ-histidinoalanine, β-benzylaminoalanine, β-(piperidin-1-yl)alanine, β-(azepan-1-yl)alanine, and fluorescent and ciprofloxacin-containing amino acid derivatives.
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Affiliation(s)
- Claudio D Navo
- Departamento de Química, Centro de Investigación en Síntesis Química, Universidad de La Rioja, 26006 Logroño, La Rioja, Spain.,CIC bioGUNE, Bizkaia Technology Park, Building 800, 48170 Derio, Spain
| | - Nuria Mazo
- Departamento de Química, Centro de Investigación en Síntesis Química, Universidad de La Rioja, 26006 Logroño, La Rioja, Spain
| | - Paula Oroz
- Departamento de Química, Centro de Investigación en Síntesis Química, Universidad de La Rioja, 26006 Logroño, La Rioja, Spain
| | - Marta I Gutiérrez-Jiménez
- Departamento de Química, Centro de Investigación en Síntesis Química, Universidad de La Rioja, 26006 Logroño, La Rioja, Spain
| | - Javier Marín
- Departamento de Química, Centro de Investigación en Síntesis Química, Universidad de La Rioja, 26006 Logroño, La Rioja, Spain
| | - Juan Asenjo
- Departamento de Química, Centro de Investigación en Síntesis Química, Universidad de La Rioja, 26006 Logroño, La Rioja, Spain
| | - Alberto Avenoza
- Departamento de Química, Centro de Investigación en Síntesis Química, Universidad de La Rioja, 26006 Logroño, La Rioja, Spain
| | - Jesús H Busto
- Departamento de Química, Centro de Investigación en Síntesis Química, Universidad de La Rioja, 26006 Logroño, La Rioja, Spain
| | - Francisco Corzana
- Departamento de Química, Centro de Investigación en Síntesis Química, Universidad de La Rioja, 26006 Logroño, La Rioja, Spain
| | - María M Zurbano
- Departamento de Química, Centro de Investigación en Síntesis Química, Universidad de La Rioja, 26006 Logroño, La Rioja, Spain
| | - Gonzalo Jiménez-Osés
- Departamento de Química, Centro de Investigación en Síntesis Química, Universidad de La Rioja, 26006 Logroño, La Rioja, Spain.,CIC bioGUNE, Bizkaia Technology Park, Building 800, 48170 Derio, Spain
| | - Jesús M Peregrina
- Departamento de Química, Centro de Investigación en Síntesis Química, Universidad de La Rioja, 26006 Logroño, La Rioja, Spain
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7
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Navo CD, Mazo N, Avenoza A, Busto JH, Peregrina JM, Jiménez-Osés G. Substituent Effects on the Reactivity of Cyclic Tertiary Sulfamidates. J Org Chem 2017; 82:13250-13255. [DOI: 10.1021/acs.joc.7b02352] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Claudio D. Navo
- Departamento de Química, Centro de Investigación en Síntesis Química, Universidad de La Rioja, 26006 Logroño, La Rioja, Spain
| | - Nuria Mazo
- Departamento de Química, Centro de Investigación en Síntesis Química, Universidad de La Rioja, 26006 Logroño, La Rioja, Spain
| | - Alberto Avenoza
- Departamento de Química, Centro de Investigación en Síntesis Química, Universidad de La Rioja, 26006 Logroño, La Rioja, Spain
| | - Jesús H. Busto
- Departamento de Química, Centro de Investigación en Síntesis Química, Universidad de La Rioja, 26006 Logroño, La Rioja, Spain
| | - Jesús M. Peregrina
- Departamento de Química, Centro de Investigación en Síntesis Química, Universidad de La Rioja, 26006 Logroño, La Rioja, Spain
| | - Gonzalo Jiménez-Osés
- Departamento de Química, Centro de Investigación en Síntesis Química, Universidad de La Rioja, 26006 Logroño, La Rioja, Spain
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8
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Zeng JL, Chachignon H, Ma JA, Cahard D. Nucleophilic Trifluoromethylthiolation of Cyclic Sulfamidates: Access to Chiral β- and γ-SCF3 Amines and α-Amino Esters. Org Lett 2017; 19:1974-1977. [DOI: 10.1021/acs.orglett.7b00501] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Jun-Liang Zeng
- UMR 6014 CNRS
COBRA, Normandie Université, INSA Rouen, 1 rue Tesnière, 76821 Mont Saint Aignan, France
- Department
of Chemistry, Tianjin Key Laboratory of Molecular Optoelectronic Sciences,
and Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300072, China
| | - Hélène Chachignon
- UMR 6014 CNRS
COBRA, Normandie Université, INSA Rouen, 1 rue Tesnière, 76821 Mont Saint Aignan, France
| | - Jun-An Ma
- Department
of Chemistry, Tianjin Key Laboratory of Molecular Optoelectronic Sciences,
and Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300072, China
| | - Dominique Cahard
- UMR 6014 CNRS
COBRA, Normandie Université, INSA Rouen, 1 rue Tesnière, 76821 Mont Saint Aignan, France
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9
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Slama S, Arfaoui Y, Besbes R. Diastereoselective Synthesis and Configurational Assignment of Novel Functionalized Cyclic Sulfamidites Precursors of Cyclic Sulfamidates. HETEROATOM CHEMISTRY 2016. [DOI: 10.1002/hc.21311] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Soumaya Slama
- Laboratory of Analytical Chemistry and Electrochemistry; Department of Chemistry; Faculty of Sciences of Tunis; University of Tunis-El Manar; Campus Universitaire 2092 El Manar 1 Tunis Tunisia
| | - Youssef Arfaoui
- Laboratory of Physical Chemistry of Condensed Matter; Department of Chemistry; Faculty of Sciences of Tunis; University of Tunis-El Manar; Campus Universitaire 2092 El Manar 1 Tunis Tunisia
| | - Rafâa Besbes
- Laboratory of Analytical Chemistry and Electrochemistry; Department of Chemistry; Faculty of Sciences of Tunis; University of Tunis-El Manar; Campus Universitaire 2092 El Manar 1 Tunis Tunisia
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10
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Mazo N, García-González I, Navo CD, Corzana F, Jiménez-Osés G, Avenoza A, Busto JH, Peregrina JM. Synthesis of Mixed α/β2,2-Peptides by Site-Selective Ring-Opening of Cyclic Quaternary Sulfamidates. Org Lett 2015; 17:5804-7. [DOI: 10.1021/acs.orglett.5b02927] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nuria Mazo
- Departamento de Química,
Centro de Investigación en Síntesis Química. Universidad de La Rioja, C/Madre de Dios, 53, 26006 Logroño, La Rioja, Spain
| | - Iván García-González
- Departamento de Química,
Centro de Investigación en Síntesis Química. Universidad de La Rioja, C/Madre de Dios, 53, 26006 Logroño, La Rioja, Spain
| | - Claudio D. Navo
- Departamento de Química,
Centro de Investigación en Síntesis Química. Universidad de La Rioja, C/Madre de Dios, 53, 26006 Logroño, La Rioja, Spain
| | - Francisco Corzana
- Departamento de Química,
Centro de Investigación en Síntesis Química. Universidad de La Rioja, C/Madre de Dios, 53, 26006 Logroño, La Rioja, Spain
| | - Gonzalo Jiménez-Osés
- Departamento de Química,
Centro de Investigación en Síntesis Química. Universidad de La Rioja, C/Madre de Dios, 53, 26006 Logroño, La Rioja, Spain
| | - Alberto Avenoza
- Departamento de Química,
Centro de Investigación en Síntesis Química. Universidad de La Rioja, C/Madre de Dios, 53, 26006 Logroño, La Rioja, Spain
| | - Jesús H. Busto
- Departamento de Química,
Centro de Investigación en Síntesis Química. Universidad de La Rioja, C/Madre de Dios, 53, 26006 Logroño, La Rioja, Spain
| | - Jesús M. Peregrina
- Departamento de Química,
Centro de Investigación en Síntesis Química. Universidad de La Rioja, C/Madre de Dios, 53, 26006 Logroño, La Rioja, Spain
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11
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García-González I, Mata L, Corzana F, Jiménez-Osés G, Avenoza A, Busto JH, Peregrina JM. Synthesis and Conformational Analysis of Hybrid α/β-Dipeptides IncorporatingS-Glycosyl-β2,2-Amino Acids. Chemistry 2014; 21:1156-68. [DOI: 10.1002/chem.201405318] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Indexed: 12/27/2022]
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12
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Majee D, Biswas S, Mobin SM, Samanta S. An expedient one-pot sequential three-component reaction for the stereoselective synthesis of functionalized spiro-sulfamidate imine fused δ-lactone scaffold. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.06.088] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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13
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Spillane W, Malaubier JB. Sulfamic Acid and Its N- and O-Substituted Derivatives. Chem Rev 2013; 114:2507-86. [DOI: 10.1021/cr400230c] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- William Spillane
- School
of Chemistry, National University of Ireland, Galway, University Road, Galway, Ireland
| | - Jean-Baptiste Malaubier
- Manufacturing Science
and
Technology, Roche Ireland Limited, Clarecastle, Co. Clare, Ireland
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14
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Wang YQ, Zhang Y, Dong H, Zhang J, Zhao J. Phosphane-Catalyzed [3+2] Cycloaddition Reaction of Allenoate and Cyclic Imines: A Simple and Efficient Method for Synthesis of Benzo-Fused Cyclic Sulfamidate Heterocycles. European J Org Chem 2013. [DOI: 10.1002/ejoc.201201756] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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15
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Mata L, Avenoza A, Busto JH, Peregrina JM. Chemoselectivity Control in the Reactions of 1,2-Cyclic Sulfamidates with Amines. Chemistry 2013; 19:6831-9. [DOI: 10.1002/chem.201204392] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2012] [Revised: 02/19/2013] [Indexed: 11/10/2022]
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16
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Majee D, Srivastava A, Mobin SM, Samanta S. l-Proline catalyzed highly efficient synthesis of Z-5-alkylidene cyclic sulfamidate imines: an easy access to 5-alkyl-substituted cyclic sulfamidate imines. RSC Adv 2013. [DOI: 10.1039/c3ra40299a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
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17
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Cai ZJ, Wang SY, Ji SJ. CuI/BF3·Et2O cocatalyzed aerobic dehydrogenative reactions of ketones with benzylamines: facile synthesis of substituted imidazoles. Org Lett 2012; 14:6068-71. [PMID: 23167242 DOI: 10.1021/ol302955u] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
A novel CuI/BF(3)·Et(2)O/O(2)-mediated reaction utilizing ketones and benzylamines for the construction of substituted imidazoles in one step under mild conditions has been demonstrated. This protocol involved the removal of eight hydrogen atoms, the functionalization of four C(sp(3))-H bonds and three new C-N bond formations.
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Affiliation(s)
- Zhong-Jian Cai
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
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18
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Mata L, Avenoza A, Busto JH, Corzana F, Peregrina JM. Quaternary Chiral β2,2-Amino Acids with Pyridinium and Imidazolium Substituents. Chemistry 2012; 18:15822-30. [DOI: 10.1002/chem.201202096] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2012] [Indexed: 11/07/2022]
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19
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Baig RBN, Varma RS. Stereo- and regio-selective one-pot synthesis of triazole-based unnatural amino acids and β-amino triazoles. Chem Commun (Camb) 2012; 48:5853-5. [DOI: 10.1039/c2cc32392c] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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20
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Saha A, Baig RBN, Leazer J, Varma RS. A modular synthesis of dithiocarbamate pendant unnatural α-amino acids. Chem Commun (Camb) 2012; 48:8889-91. [DOI: 10.1039/c2cc32894a] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Hu B, Wang Z, Ai N, Zheng J, Liu XH, Shan S, Wang Z. Catalyst-free preparation of 1,2,4,5-tetrasubstituted imidazoles from a novel unexpected domino reaction of 2-azido acrylates and nitrones. Org Lett 2011; 13:6362-5. [PMID: 22070138 DOI: 10.1021/ol202650z] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A highly efficient and convenient method for the synthesis of 1,2,4,5-tetrasubstituted imidazoles from readily accessible 2-azido acrylates and nitrones has been developed. This reaction proceeded under mild conditions without the assistance of any metal, acid, or base.
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Affiliation(s)
- Bao Hu
- College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310014, PR China.
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22
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Taylor CM, De Silva ST. Synthesis of Histidinoalanine: A Comparison of β-Lactone and Sulfamidate Electrophiles. J Org Chem 2011; 76:5703-8. [DOI: 10.1021/jo200744d] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Carol M. Taylor
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
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