1
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Abdulla M, Hussain MK, Ahamad S. Trifluoromethylnitrone: a versatile building block for synthesizing trifluoromethyl-containing heterocyclic compounds. Org Biomol Chem 2024; 22:5242-5256. [PMID: 38881404 DOI: 10.1039/d4ob00849a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/18/2024]
Abstract
This review explores the significance of trifluoromethylnitrones in synthesizing fluorine-containing compounds, with a particular focus on trifluoromethylated heterocycles. It explores the versatility of trifluoromethylnitrones, especially in [3 + 2] cycloaddition reactions, highlighting their unique reactivity with various dienophile substrates. Trifluoromethylnitrones are valuable precursors for the rapid synthesis of medicinally important trifluoromethylated heterocycles, including isoxazolidines, dihydroisoxazoles, oxathiazolidines, β-lactams, and aziridines. These heterocycles, in turn, serve as synthons for synthesizing trifluoromethylated lactams and aminoalcohols. Additionally, nitrone chemistry extends to synthesizing trifluoromethylated nucleosides and trifluorinated organoborane heterocycles, demonstrating their versatility. While sharing similarities with trifluorodiazoethane reactivity, trifluoromethylnitrones offer distinct advantages by enabling the synthesis of heterocycles typically inaccessible with trifluorodiazoethane.
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Affiliation(s)
- Mohd Abdulla
- Babasaheb Bhimrao Ambedkar University, Lucknow-226025, India
| | | | - Shakir Ahamad
- Department of Chemistry, Aligarh Muslim University, Aligarh-202002, India.
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2
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Mayorquín-Torres MC, Simoens A, Bonneure E, Stevens CV. Synthetic Methods for Azaheterocyclic Phosphonates and Their Biological Activity: An Update 2004-2024. Chem Rev 2024; 124:7907-7975. [PMID: 38809666 DOI: 10.1021/acs.chemrev.4c00090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2024]
Abstract
The increasing importance of azaheterocyclic phosphonates in the agrochemical, synthetic, and medicinal field has provoked an intense search in the development of synthetic routes for obtaining novel members of this family of compounds. This updated review covers methodologies established since 2004, focusing on the synthesis of azaheterocyclic phosphonates, of which the phosphonate moiety is directly substituted onto to the azaheterocyclic structure. Emphasizing recent advances, this review classifies newly developed synthetic approaches according to the ring size and providing information on biological activities whenever available. Furthermore, this review summarizes information on various methods for the formation of C-P bonds, examining sustainable approaches such as the Michaelis-Arbuzov reaction, the Michaelis-Becker reaction, the Pudovik reaction, the Hirao coupling, and the Kabachnik-Fields reaction. After analyzing the biological activities and applications of azaheterocyclic phosphonates investigated in recent years, a predominant focus on the evaluation of these compounds as anticancer agents is evident. Furthermore, emerging applications underline the versatility and potential of these compounds, highlighting the need for continued research on synthetic methods to expand this interesting family.
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Affiliation(s)
- Martha C Mayorquín-Torres
- SynBioC Research Group, Green Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
| | - Andreas Simoens
- SynBioC Research Group, Green Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
| | - Eli Bonneure
- SynBioC Research Group, Green Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
| | - Christian V Stevens
- SynBioC Research Group, Green Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
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3
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Jamali MF, Ahmad M, Chandrasekharan SP, Mohanan K. Trapping of Arynes with In Situ Generated Aryltrifluoromethylnitrones Enables Access to Trifluoromethylated Benzoxazolines. Org Lett 2023; 25:7551-7556. [PMID: 37815503 DOI: 10.1021/acs.orglett.3c02895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/11/2023]
Abstract
Herein, we report a rare example of trapping arynes using in situ generated aryltrifluoromethylnitrone to access an important class of trifluoromethylated benzoxazolines. This three-component strategy involves a nitrone formation/[3 + 2] cycloaddition/thermal rearrangement cascade and furnishes trifluoromethylated benzoxazolines in high yields. The scope of the reaction is quite broad with respect to aryltrifluorodiazoethanes, nitrosoarenes, and arynes. The proposed reaction pathway is supported through the isolation and characterization of the key reaction intermediates phenyltrifluoromethylnitrone and benzisoxazoline.
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Affiliation(s)
- Muhammad Fahad Jamali
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, BS-10/1, Sector 10, Jankipuram Extension, Sitapur Road, P.O. Box 173, Lucknow 226031, India
- Academy of Scientific and Innovative Research, Ghaziabad 201002, India
| | - Mumtaz Ahmad
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, BS-10/1, Sector 10, Jankipuram Extension, Sitapur Road, P.O. Box 173, Lucknow 226031, India
- Academy of Scientific and Innovative Research, Ghaziabad 201002, India
| | - Sanoop P Chandrasekharan
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, BS-10/1, Sector 10, Jankipuram Extension, Sitapur Road, P.O. Box 173, Lucknow 226031, India
| | - Kishor Mohanan
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, BS-10/1, Sector 10, Jankipuram Extension, Sitapur Road, P.O. Box 173, Lucknow 226031, India
- Academy of Scientific and Innovative Research, Ghaziabad 201002, India
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4
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Dhami A, Chandrasekharan SP, Mohanan K. Direct Access to Trifluoromethylated Benzo[ d]oxepines from o-Alkynylaryl Aldehydes and Trifluorodiazoethane. Org Lett 2023; 25:3018-3022. [PMID: 37092874 DOI: 10.1021/acs.orglett.3c00801] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/25/2023]
Abstract
Reported in this Letter is a silver-catalyzed reaction between o-alkynylaryl aldehydes and trifluorodiazoethane that enables an expedient synthesis of trifluoromethylated benzo[d]oxepines. The reaction works through a silver-promoted 6-endo-dig cyclization of o-alkynylbenzaldehydes for the generation of an isochromenylium intermediate, which upon a ring-expansive addition of trifluorodiazoethane delivers a novel class of trifluoromethylated benzoxepine frameworks. This strategy was applied to the synthesis of phosphonylated benzo[d]oxepines using the Seyferth-Gilbert reagent.
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Affiliation(s)
- Anamika Dhami
- Medicinal and Process Chemistry Division, Central Drug Research Institute (CSIR), BS-10/1, Sector 10, Jankipuram Extension, Sitapur Road, P.O. Box 173, Lucknow, Uttar Pradesh 226031, India
| | - Sanoop P Chandrasekharan
- Medicinal and Process Chemistry Division, Central Drug Research Institute (CSIR), BS-10/1, Sector 10, Jankipuram Extension, Sitapur Road, P.O. Box 173, Lucknow, Uttar Pradesh 226031, India
| | - Kishor Mohanan
- Medicinal and Process Chemistry Division, Central Drug Research Institute (CSIR), BS-10/1, Sector 10, Jankipuram Extension, Sitapur Road, P.O. Box 173, Lucknow, Uttar Pradesh 226031, India
- Academy of Scientific and Innovative Research, Ghaziabad, Uttar Pradesh 201002, India
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5
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Wu Y, Liu Q, Huang S, Zhang C, Wei W, Li X. Cu(OAc) 2-catalyzed three-component cycloaddition of malonates, nitrosoarenes and alkenes: access to isoxazolidines. Org Biomol Chem 2023; 21:3669-3674. [PMID: 37067779 DOI: 10.1039/d3ob00189j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/18/2023]
Abstract
The Cu(OAc)2-catalyzed one-pot three-component cycloaddition of malonates, nitrosoarenes and alkenes is described. A wide range of isoxazolidines could be obtained in moderate to excellent yields via this method. Mechanistic investigations indicated that the key step in this catalytic system is the straightforward formation of nitrone intermediates through the Cu(OAc)2-catalyzed reaction of malonates with nitrosoarenes.
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Affiliation(s)
- Yuting Wu
- College of Biomedical Engineering, Taiyuan University of Technology, 79 West Yingze Street, Taiyuan 030024, China.
| | - Qiang Liu
- College of Biomedical Engineering, Taiyuan University of Technology, 79 West Yingze Street, Taiyuan 030024, China.
| | - Shuangping Huang
- College of Biomedical Engineering, Taiyuan University of Technology, 79 West Yingze Street, Taiyuan 030024, China.
| | - Chaofeng Zhang
- College of Biomedical Engineering, Taiyuan University of Technology, 79 West Yingze Street, Taiyuan 030024, China.
| | - Wenlong Wei
- College of Biomedical Engineering, Taiyuan University of Technology, 79 West Yingze Street, Taiyuan 030024, China.
| | - Xing Li
- College of Biomedical Engineering, Taiyuan University of Technology, 79 West Yingze Street, Taiyuan 030024, China.
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6
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Kumar A, Khan WA, Ahamad S, Mohanan K. Trifluorodiazoethane: A versatile building block to access trifluoromethylated heterocycles. J Heterocycl Chem 2021. [DOI: 10.1002/jhet.4416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Anuj Kumar
- Medicinal and Process Chemistry Division CSIR‐Central Drug Research Institute Lucknow India
| | | | - Shakir Ahamad
- Department of Chemistry Aligarh Muslim University Aligarh India
| | - Kishor Mohanan
- Medicinal and Process Chemistry Division CSIR‐Central Drug Research Institute Lucknow India
- Medicinal and Process Chemistry Division Academy of Scientific and Innovative Research Ghaziabad India
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7
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Bakulina O, Inyutina A, Dar’in D, Krasavin M. Multicomponent Reactions Involving Diazo Reagents: A 5-Year Update. Molecules 2021; 26:6563. [PMID: 34770972 PMCID: PMC8587191 DOI: 10.3390/molecules26216563] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 10/25/2021] [Accepted: 10/26/2021] [Indexed: 01/18/2023] Open
Abstract
This review summarizes recent developments in multicomponent reactions of diazo compounds. The role of diazo reagent and the type of interaction between components was analyzed to structure the discussion. In contrast to previous reviews on related topics mostly focused on metal catalyzed transformations, a substantial amount of organocatalytic or catalyst-free methodologies is covered in this work.
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Affiliation(s)
- Olga Bakulina
- Institute of Chemistry, St. Petersburg State University, 26 Universitetskii Pr., 198504 Peterhof, Russia; (A.I.); (D.D.)
| | | | | | - Mikhail Krasavin
- Institute of Chemistry, St. Petersburg State University, 26 Universitetskii Pr., 198504 Peterhof, Russia; (A.I.); (D.D.)
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8
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Does the reaction of nitrone derivatives with allenoates proceed by an initial (3 + 2) cycloaddition or O-Nucleophilic addition? A quantum chemical investigation. J Mol Graph Model 2021; 109:108036. [PMID: 34614454 DOI: 10.1016/j.jmgm.2021.108036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Revised: 08/29/2021] [Accepted: 09/19/2021] [Indexed: 11/24/2022]
Abstract
The question of whether the reaction between nitrone derivatives and allenoates proceeds with initial (3 + 2) cycloaddition (32CA) or the oxygen-nucleophilic (O-nucleophilic) addition has been theoretically investigated using density functional theory (DFT) at the M06-2X/6-311G(d,p) level of theory. In all of the reactions considered, the initial 32CA route is kinetically and thermodynamically preferred over the initial O-nucleophilic addition. Increasing the steric bulk of the substituents on the reactants bridges the kinetic and thermodynamic gap between the initial 32CA and O-nucleophilic addition but the 32CA is still energetically preferred, showing that with increasing steric bulk, the O-nucleophilic addition may become competitive with the 32CA route. Within the 32CA reactions, analysis of electrophilic (Pk+) and nucleophilic (Pk-) Parr functions at the various reaction centers in the allenoate indicates that the three-atom-components (TACs) chemo-selectively add across the olefinic bond bearing the ester functionality (COOMe) with the largest Mulliken spin density coefficients and this observation agrees with the energetic trends and experimental outcomes. The global electron density transfer (GEDT) analysis reveals a high polar character associated with the 32CA reaction of methylbuta-2,3-dienoate with N-methyl-C-phenylnitrone while that of the 32CA reaction of methylpenta-2,3-dienoate with N-cyclohexenylnitrone has a low polar character.
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9
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Qiu S, Cao T, Zhu S. Catalyst-free synthesis of isoxazolidine from nitrosoarene and haloalkyne via a 1,2-halo-migration/[3 + 2] cycloaddition cascade. Org Biomol Chem 2021; 19:3139-3143. [PMID: 33885568 DOI: 10.1039/d1ob00421b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An unprecedented catalyst-free three-component reaction to synthesize isoxazolidine from easily accessible haloalkyne, nitrosoarene and maleimide was developed. This reaction was proposed to proceed via a 1,2-halo migration and [3 + 2] cycloaddition cascade, providing a new reaction pattern of alkyne and nitroso containing species wherein a new type of nitrone was generated. Besides, the reaction conditions were efficient and environmentally benign, enabling the formation of various bioactivity-related isoxazolidines.
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Affiliation(s)
- Shaotong Qiu
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China.
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10
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Tian YT, Zhang FG, Ma JA. Et3N-catalyzed direct cycloaddition reaction of allenoates with acceptor diazo compounds. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.131922] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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11
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Li MH, Si XJ, Zhang H, Yang D, Niu JL, Song MP. Directed Cobalt-Catalyzed C-H Activation to Form C-C and C-O Bonds in One Pot via Three-Component Coupling. Org Lett 2021; 23:914-919. [PMID: 33475370 DOI: 10.1021/acs.orglett.0c04122] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Herein, we disclose an efficient cobalt-catalyzed three-component coupling of benzamides, diazo compounds, and tert-butyl hydroperoxide, which provides an efficient approach to construct C(sp2)-C(sp3) and C-O bonds in one-pot accompanied with C-H activation. This protocol features low catalyst loading (4 mol %), the avoidance of additives, and excellent functional group compatibility, providing three-component coupling adducts with high yields under mild conditions (up to 88%). Mechanism studies show that the reaction may involve a radical process.
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Affiliation(s)
- Meng-Hui Li
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou 450001, P. R. China
| | - Xiao-Ju Si
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou 450001, P. R. China
| | - He Zhang
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou 450001, P. R. China
| | - Dandan Yang
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou 450001, P. R. China
| | - Jun-Long Niu
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou 450001, P. R. China
| | - Mao-Ping Song
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou 450001, P. R. China
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12
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Zhai P, Li W, Lin J, Huang S, Gao W, Li X. N-Alkyl nitrones as substrates for access to N-aryl isoxazolidines via a catalyst-free one-pot three-component reaction with nitroso compounds and olefins. Org Chem Front 2021. [DOI: 10.1039/d1qo00398d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
N-Alkyl nitrones are used as starting materials to construct N-aryl isoxazolidines, instead of N-alkyl isoxazolidines or N–H 1,3-oxazinanes via a catalyst-free one-pot three-component reaction with nitrosoarenes and olefins.
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Affiliation(s)
- Pingan Zhai
- College of Biomedical Engineering
- Taiyuan University of Technology
- Taiyuan 030024
- China
| | - Wenhui Li
- College of Biomedical Engineering
- Taiyuan University of Technology
- Taiyuan 030024
- China
| | - Jianying Lin
- College of Biomedical Engineering
- Taiyuan University of Technology
- Taiyuan 030024
- China
| | - Shuangping Huang
- College of Biomedical Engineering
- Taiyuan University of Technology
- Taiyuan 030024
- China
| | - Wenchao Gao
- College of Biomedical Engineering
- Taiyuan University of Technology
- Taiyuan 030024
- China
| | - Xing Li
- College of Biomedical Engineering
- Taiyuan University of Technology
- Taiyuan 030024
- China
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13
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Jamali MF, Vaishanv NK, Mohanan K. The Bestmann-Ohira Reagent and Related Diazo Compounds for the Synthesis of Azaheterocycles. CHEM REC 2020; 20:1394-1408. [PMID: 32986304 DOI: 10.1002/tcr.202000091] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Revised: 09/03/2020] [Accepted: 09/03/2020] [Indexed: 12/14/2022]
Abstract
Azaheterocycles are one of the most prevalent classes of compounds present in numerous bioactive compounds, natural products, and agrochemicals, and undoubtedly, new methods to access them are always in high demand. Among the methods available, the 1,3-dipolar cycloaddition reactions involving diazo compounds are particularly attractive because of their ability to rapidly construct densely functionalized azaheterocycles in a regioselective manner. In this context, the Bestmann-Ohira reagent has become a well-known reagent for the 1,3-dipolar cycloaddition reactions to produce phosphonylated heterocycles, besides its widespread use as a homologating agent for the conversion of aldehydes to alkynes. This account details our efforts toward broadening the synthetic utility of the Bestmann-Ohira reagent and related compounds for the preparation of azaheterocycles such as pyrazoles, spirooxindoles, triazoles, triazolines, and spiropyrazolines, emphasizing on domino multicomponent reactions employing readily available feedstock reagents.
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Affiliation(s)
- Muhammad Fahad Jamali
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Narendra Kumar Vaishanv
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India
| | - Kishor Mohanan
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
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14
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Peng X, Zhang F, Ma J. Cu‐Catalysed Three‐Component Reaction of Aryldiazonium Salts with Fluorinated Diazo Reagents and Nitriles: Access to Difluoro‐ and Trifluoromethylated
N
1
‐Aryl‐1,2,4‐triazoles. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000776] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Xing Peng
- Department of Chemistry Tianjin Key Laboratory of Molecular Optoelectronic Sciences Frontiers Science Center for Synthetic Biology (Ministry of Education) Tianjin Collaborative Innovation Centre of Chemical Science & Engineering Tianjin University Tianjin 300072
- Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University, Binhai New City Fuzhou 350207 People's Republic of China
| | - Fa‐Guang Zhang
- Department of Chemistry Tianjin Key Laboratory of Molecular Optoelectronic Sciences Frontiers Science Center for Synthetic Biology (Ministry of Education) Tianjin Collaborative Innovation Centre of Chemical Science & Engineering Tianjin University Tianjin 300072
- Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University, Binhai New City Fuzhou 350207 People's Republic of China
| | - Jun‐An Ma
- Department of Chemistry Tianjin Key Laboratory of Molecular Optoelectronic Sciences Frontiers Science Center for Synthetic Biology (Ministry of Education) Tianjin Collaborative Innovation Centre of Chemical Science & Engineering Tianjin University Tianjin 300072
- Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University, Binhai New City Fuzhou 350207 People's Republic of China
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Zhang Y, Pan H, Liu W, Cao W, Feng X. Asymmetric Catalytic Synthesis of Epoxides via Three-Component Reaction of Diazoacetates, 2-Oxo-3-ynoates, and Nitrosoarenes. Org Lett 2020; 22:6744-6749. [DOI: 10.1021/acs.orglett.0c02108] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yu Zhang
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Hao Pan
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Wen Liu
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Weidi Cao
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
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16
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Jamali MF, Gupta E, Kumar A, Kant R, Mohanan K. Ag-Catalyzed Trifluoromethylative Ring Expansion of Isatins and Isatin Ketimines with Trifluorodiazoethane. Chem Asian J 2020; 15:757-761. [PMID: 32017397 DOI: 10.1002/asia.201901799] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Revised: 02/03/2020] [Indexed: 01/06/2023]
Abstract
A general method for the construction of trifluoromethylated 2-quinolinones has been established herein by using a trifluoromethylative ring expansion of isatin with trifluorodiazoethane. The strategy provides a platform for the rapid synthesis of a wide range of substituted 3-hydroxy-4-trifluoromethyl-2-quinolinones. This operationally simple and robust Ag-catalyzed protocol successfully transforms isatin ketimines to 3-amino-4-trifluoromethylquinolinones in excellent yields. The utility of this novel method is further illustrated by the conversion of the products into various synthetically and medicinally relevant molecules.
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Affiliation(s)
- Muhammad Fahad Jamali
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India.,Academy of Scientific and Innovative Research, 110025, New Delhi, India
| | - Ekta Gupta
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India
| | - Anuj Kumar
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India
| | - Ruchir Kant
- Molecular and Structural Biology, CSIR-Central Drug Research Institute, Lucknow, 226031, India
| | - Kishor Mohanan
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India.,Academy of Scientific and Innovative Research, 110025, New Delhi, India
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Abstract
The 1,3-dipolar cycloaddition reaction is a powerful and versatile strategy for
the synthesis of carbocyclic and heterocyclic five-membered rings. Herein, the most recent
developments on the [3+2] cycloaddition reactions using allenes acting either as dipolarophiles
or 1,3-dipole precursors, are highlighted. The recent contributions on the
phosphine- and transition metal-catalyzed [3+2] annulations involving allenes as substrates
are also covered, with the exception of those in which the formation of a 1,3-dipole
(or synthetic equivalent) is not invoked.
This review summarizes the most relevant research in which allenes are used as building
blocks for the construction of structurally diverse five-membered rings via [3+2] annulation
reactions.
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Affiliation(s)
- Ana L. Cardoso
- CQC and Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
| | - Maria I.L. Soares
- CQC and Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
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