1
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Arunkirirote P, Suwalak P, Chaisan N, Tummatorn J, Ruchirawat S, Thongsornkleeb C. Electron Donor-Acceptor Complex-Enabled Autoinductive Conversion of Acylnitromethanes to Acylnitrile Oxides in a Photochemical Machetti-De Sarlo Reaction: Synthesis of 5-Substituted 3-Acylisoxazoles. Org Lett 2024. [PMID: 39213530 DOI: 10.1021/acs.orglett.4c02708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/04/2024]
Abstract
A photochemical Machetti-De Sarlo reaction has been developed for preparing 5-substituted 3-acylisoxazoles from acylnitromethanes and terminal alkynes. This photochemical protocol utilizes an innovative electron donor-acceptor complex, generated in situ from acylnitromethanes, catalytic LiOtBu, and 1,1,1,3,3,3-hexafluoro-2-propanol, as a photosensitizer to promote rapid conversion with a broad substrate scope in up to 80% efficiency. A sigmoidal autoinductive kinetic profile is revealed, demonstrating the novel and unique dual catalysis in the first photochemical approach of this reaction.
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Affiliation(s)
- Piyaporn Arunkirirote
- Laboratory of Medicinal Chemistry, Chulabhorn Research Institute, 54 Kamphaeng Phet 6, Laksi, Bangkok 10210, Thailand
| | - Pornteera Suwalak
- Laboratory of Medicinal Chemistry, Chulabhorn Research Institute, 54 Kamphaeng Phet 6, Laksi, Bangkok 10210, Thailand
| | - Nattawadee Chaisan
- Program on Chemical Sciences, Chulabhorn Graduate Institute, 54 Kamphaeng Phet 6, Laksi, Bangkok 10210, Thailand
| | - Jumreang Tummatorn
- Laboratory of Medicinal Chemistry, Chulabhorn Research Institute, 54 Kamphaeng Phet 6, Laksi, Bangkok 10210, Thailand
- Program on Chemical Sciences, Chulabhorn Graduate Institute, 54 Kamphaeng Phet 6, Laksi, Bangkok 10210, Thailand
- Center of Excellence on Environmental Health and Toxicology (EHT), Office of the Permanent Secretary (OPS), Ministry of Higher Education, Science, Research and Innovation (MHESI), Bangkok 10400, Thailand
| | - Somsak Ruchirawat
- Laboratory of Medicinal Chemistry, Chulabhorn Research Institute, 54 Kamphaeng Phet 6, Laksi, Bangkok 10210, Thailand
- Program on Chemical Sciences, Chulabhorn Graduate Institute, 54 Kamphaeng Phet 6, Laksi, Bangkok 10210, Thailand
- Center of Excellence on Environmental Health and Toxicology (EHT), Office of the Permanent Secretary (OPS), Ministry of Higher Education, Science, Research and Innovation (MHESI), Bangkok 10400, Thailand
| | - Charnsak Thongsornkleeb
- Laboratory of Medicinal Chemistry, Chulabhorn Research Institute, 54 Kamphaeng Phet 6, Laksi, Bangkok 10210, Thailand
- Program on Chemical Sciences, Chulabhorn Graduate Institute, 54 Kamphaeng Phet 6, Laksi, Bangkok 10210, Thailand
- Center of Excellence on Environmental Health and Toxicology (EHT), Office of the Permanent Secretary (OPS), Ministry of Higher Education, Science, Research and Innovation (MHESI), Bangkok 10400, Thailand
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2
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Yamamoto D, Matsukawa D, Kikuchi R, Narushima Y, Kumakura Y, Ito M, Makino K. Manganese-Catalyzed 5- Endo-trig Oxygenative Cyclization of α,β-Unsaturated Oximes under Air and Ambient Conditions for the Synthesis of 4,5-Dihydroisoxazoles. J Org Chem 2024; 89:6377-6388. [PMID: 38634731 DOI: 10.1021/acs.joc.4c00390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/19/2024]
Abstract
The stereoselective 5-endo-trig oxygenative cyclization of α,β-unsaturated oximes was achieved using molecular oxygen (O2) and a manganese catalyst. Several 4-hydroxy-4,5-dihydroisoxazoles were obtained in high yields by directly incorporating O2 from the atmosphere (eliminating the necessity for a pure oxygen environment) and using an unprecedentedly low loading of Mn(acac)3 (as little as 0.020 mol %) without additional additives. Because of its desirable features, such as operational simplicity, inexpensive catalyst, mild reaction conditions (open flask conditions at room temperature), and broad substrate compatibility, this novel reaction provides an attractive synthetic approach to producing 4-hydroxy-4,5-dihydroisoxazoles.
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Affiliation(s)
- Daisuke Yamamoto
- Laboratory of Organic Chemistry for Drug Development and Medical Research Laboratories, Department of Pharmaceutical Sciences, Kitasato University, Tokyo 108-8641, Japan
| | - Daisuke Matsukawa
- Laboratory of Organic Chemistry for Drug Development and Medical Research Laboratories, Department of Pharmaceutical Sciences, Kitasato University, Tokyo 108-8641, Japan
| | - Ryusei Kikuchi
- Laboratory of Organic Chemistry for Drug Development and Medical Research Laboratories, Department of Pharmaceutical Sciences, Kitasato University, Tokyo 108-8641, Japan
| | - Yuki Narushima
- Laboratory of Organic Chemistry for Drug Development and Medical Research Laboratories, Department of Pharmaceutical Sciences, Kitasato University, Tokyo 108-8641, Japan
| | - Yuta Kumakura
- Laboratory of Organic Chemistry for Drug Development and Medical Research Laboratories, Department of Pharmaceutical Sciences, Kitasato University, Tokyo 108-8641, Japan
| | - Mana Ito
- Laboratory of Organic Chemistry for Drug Development and Medical Research Laboratories, Department of Pharmaceutical Sciences, Kitasato University, Tokyo 108-8641, Japan
| | - Kazuishi Makino
- Laboratory of Organic Chemistry for Drug Development and Medical Research Laboratories, Department of Pharmaceutical Sciences, Kitasato University, Tokyo 108-8641, Japan
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3
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Zhao Y, Li X, Homölle SL, Wang B, Ackermann L. Electrochemical assembly of isoxazoles via a four-component domino reaction. Chem Sci 2024; 15:1117-1122. [PMID: 38239685 PMCID: PMC10793645 DOI: 10.1039/d3sc05946d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Accepted: 12/10/2023] [Indexed: 01/22/2024] Open
Abstract
Multicomponent domino reactions via electrochemical annulations have emerged as a robust strategy for the rapid assembly of heterocyclics. Herein, an electrochemical annulation via a [1 + 2 + 1 + 1] four-component domino reaction was accomplished in a user-friendly undivided cell setup to assemble valuable five-membered isoxazole motifs. Our approach is characterized by a high level functional group tolerance and operational simplicity, avoiding the tedious and time-consuming preparation of pre-functionalized substrates. Detailed mechanistic studies were conducted including isotopic labeling, kinetic studies, cyclic voltammetry (CV) analysis, and intermediate characterization, providing support for a radical pathway.
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Affiliation(s)
- Yuanyuan Zhao
- Key Laboratory of Xin'an Medicine of the Ministry of Education, School of Pharmacy, Anhui University of Chinese Medicine Hefei 230038 P. R. China
| | - Xinyue Li
- Key Laboratory of Xin'an Medicine of the Ministry of Education, School of Pharmacy, Anhui University of Chinese Medicine Hefei 230038 P. R. China
| | - Simon L Homölle
- Institut für Organische und Biomolekulare Chemie and Wöhler Research Institute for Sustainable Chemistry(WISCh), Georg-August-Universität Göttingen Tammannstraße 2 37077 Göttingen Germany
| | - Bin Wang
- Key Laboratory of Xin'an Medicine of the Ministry of Education, School of Pharmacy, Anhui University of Chinese Medicine Hefei 230038 P. R. China
- Institut für Organische und Biomolekulare Chemie and Wöhler Research Institute for Sustainable Chemistry(WISCh), Georg-August-Universität Göttingen Tammannstraße 2 37077 Göttingen Germany
- Institute of Pharmaceutical Chemistry, Anhui Academy of Chinese Medicine Hefei 230038 P. R. China
| | - Lutz Ackermann
- Institut für Organische und Biomolekulare Chemie and Wöhler Research Institute for Sustainable Chemistry(WISCh), Georg-August-Universität Göttingen Tammannstraße 2 37077 Göttingen Germany
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4
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Chen L, Wang Z, Liu H, Li X, Wang B. tert-Butyl nitrite triggered radical cascade reaction for synthesizing isoxazoles by a one-pot multicomponent strategy. Chem Commun (Camb) 2022; 58:9152-9155. [PMID: 35894608 DOI: 10.1039/d2cc02823a] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A metal-free radical cyclization/dehydrogenation cascade of alkenes with aldehydes has been developed for the synthesis of 3,5-disubstituted isoxazoles in a one-pot system. This protocol features excellent functional group tolerance and operational simplicity, and is easily scaled up. The radical process is well supported by TEMPO-adducts and the intermediate β-carbonyl ketoxime.
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Affiliation(s)
- Leijing Chen
- Key Laboratory of Xin'an Medicine of the Ministry of Education, Anhui University of Chinese Medicine, Hefei, 230038, P. R. China.
| | - Zhen Wang
- Key Laboratory of Xin'an Medicine of the Ministry of Education, Anhui University of Chinese Medicine, Hefei, 230038, P. R. China.
| | - Hui Liu
- Key Laboratory of Xin'an Medicine of the Ministry of Education, Anhui University of Chinese Medicine, Hefei, 230038, P. R. China.
| | - Xinyue Li
- Key Laboratory of Xin'an Medicine of the Ministry of Education, Anhui University of Chinese Medicine, Hefei, 230038, P. R. China.
| | - Bin Wang
- Key Laboratory of Xin'an Medicine of the Ministry of Education, Anhui University of Chinese Medicine, Hefei, 230038, P. R. China. .,Institute of Pharmaceutical Chemistry, Anhui Academy of Chinese Medicine, Hefei, 230038, P. R. China
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5
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Vadivelu M, Sampath S, Muthu K, Karthikeyan K, Praveen C. Mechanochemistry Enabled Construction of Isoxazole Skeleton
via
CuO Nanoparticles Catalyzed Intermolecular Dehydrohalogenative Annulation. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202100730] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Murugan Vadivelu
- Department of Chemistry B. S. Abdur Rahman Crescent Institute of Science and Technology Vandalur, Chennai 600048 Tamil Nadu India
| | - Sugirdha Sampath
- Department of Chemistry B. S. Abdur Rahman Crescent Institute of Science and Technology Vandalur, Chennai 600048 Tamil Nadu India
- Department of Metallurgical & Materials Engineering Indian Institute of Technology-Madras (IITM) Chennai 600036 Tamil Nadu India
| | - Kesavan Muthu
- Interdisplinary Institute of Indian System of Medicine (IIISM) SRM Institute of Science and Technology Kattankulathur 603203 Chengalpattu District Tamil Nadu India
| | - Kesavan Karthikeyan
- Department of Chemistry B. S. Abdur Rahman Crescent Institute of Science and Technology Vandalur, Chennai 600048 Tamil Nadu India
| | - Chandrasekar Praveen
- Electrochemical Power Sources Division Central Electrochemical Research Institute (CSIR Laboratory) Alagappapuram, Karaikudi 630003 Sivagangai District Tamil Nadu India
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6
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Zhang Y, Xin J, Wang C. Stereoselective Synthesis of 4,5‐Dihydroisoxazole Derivatives from 1,1‐Dicyanocyclopropanes and Hydroxylamine Hydrochloride. Helv Chim Acta 2021. [DOI: 10.1002/hlca.202100032] [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)
- Yue Zhang
- School of Chemistry and Chemical Engineering Yangzhou University 180 Siwangting Street Yangzhou 225002 P. R. China
| | - Junhu Xin
- School of Chemistry and Chemical Engineering Yangzhou University 180 Siwangting Street Yangzhou 225002 P. R. China
| | - Cunde Wang
- School of Chemistry and Chemical Engineering Yangzhou University 180 Siwangting Street Yangzhou 225002 P. R. China
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7
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Bakhshandeh A, dos Santos AP, Levin Y. Interaction between Charge-Regulated Metal Nanoparticles in an Electrolyte Solution. J Phys Chem B 2020; 124:11762-11770. [DOI: 10.1021/acs.jpcb.0c09446] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Amin Bakhshandeh
- Instituto de Física, Universidade Federal do Rio Grande do Sul, Caixa Postal 15051, CEP 91501-970, Porto Alegre, RS, Brazil
| | - Alexandre P. dos Santos
- Instituto de Física, Universidade Federal do Rio Grande do Sul, Caixa Postal 15051, CEP 91501-970, Porto Alegre, RS, Brazil
| | - Yan Levin
- Instituto de Física, Universidade Federal do Rio Grande do Sul, Caixa Postal 15051, CEP 91501-970, Porto Alegre, RS, Brazil
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8
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Umemoto N, Imayoshi A, Tsubaki K. Nitrile oxide cycloaddition reactions of alkenes or alkynes and nitroalkanes substituted with O-alkyloxime groups convertible to various functional groups. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.152213] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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9
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Greener Synthesis of Nitrogen-Containing Heterocycles in Water, PEG, and Bio-Based Solvents. Catalysts 2020. [DOI: 10.3390/catal10040429] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
The solvents used in chemistry are a fundamental element of the environmental performance of processes in corporate and academic laboratories. Their influence on costs, health safety, and nature cannot be neglected. Quantitatively, solvents are the most abundant constituents of chemical transformations; therefore, acting on solvents and replacing standard solvents with safer products can have a great ecological impact. However, not all green solvents are suitable for the wide scope of organic chemistry reactions. A second point to consider is that 50% of pharmaceutical drugs are nitrogen heterocycles compounds. It therefore appeared important to provide an overview of the more ecological methodologies for synthesizing this class of compounds. In this review, all publications since 2000 that describe green reactions leading to the formation of nitrogen heterocycles using safe solvents were considered. We chose water, PEG, and bio-based solvents for their negligible toxicity. The synthesis of five-, six-, and seven-membered aromatic nitrogen heterocycles using green reactions reported in the literature to date is described.
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10
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Kaur M, Singh B, Arjuna A. Lewis acid–catalyzed green synthesis and biological studies of pyrrolo[3,4‐c]pyrazoles in aqueous medium. J Heterocycl Chem 2019. [DOI: 10.1002/jhet.3740] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Manpreet Kaur
- Department of ChemistryPunjabi University Patiala India
| | - Baldev Singh
- Department of ChemistryPunjabi University Patiala India
| | - Anania Arjuna
- Faculty of Applied Medical SciencesLovely Professional University Jalandhar India
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11
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Vadivelu M, Sampath S, Muthu K, Karthikeyan K, Praveen C. Harnessing the TEMPO-Catalyzed Aerobic Oxidation for Machetti-De Sarlo Reaction toward Sustainable Synthesis of Isoxazole Libraries. J Org Chem 2019; 84:13636-13645. [PMID: 31557022 DOI: 10.1021/acs.joc.9b01896] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A practical synthesis of isoxazole/isoxazoline derivatives via Machetti-De Sarlo reaction under sustainable conditions has been accomplished. This protocol involves the use of readily available 2,2,6,6-tetramethylpiperidine-N-oxyl (TEMPO) to catalyze the cyclocondensation of primary nitroalkanes with alkynes/alkenes to afford a library of isoxazole/isoxazoline products. From an eco-benign perspective, notable advantages of this method are as follows: (i) water as the solvent, (ii) air as the oxidant, (iii) transition metal-free, (iv) no base required, (v) no toxic byproduct, (vi) no need of solvent extraction, (vii) diverse substrate scope, (viii) high chemical yields, (ix) excellent chemo- and regioselectivity, (x) short reaction time, (xi) gram-scale synthesis, (xii) extension to heterogeneous version, and (xiii) catalyst recyclability. For these reasons, the developed method is appropriate for safe laboratory use and can be expected to inspire the progress of TEMPO-based organocatalysis for the preparation of isoxazole/isoxazoline moieties in an environmentally benign fashion.
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Affiliation(s)
- Murugan Vadivelu
- Department of Chemistry , B. S. Abdur Rahman Crescent Institute of Science and Technology , Vandalur , Chennai 600048 , Tamil Nadu , India
| | - Sugirdha Sampath
- Department of Chemistry , B. S. Abdur Rahman Crescent Institute of Science and Technology , Vandalur , Chennai 600048 , Tamil Nadu , India.,Department of Metallurgical & Materials Engineering , Indian Institute of Technology-Madras (IITM) , Chennai 600036 , Tamil Nadu , India
| | - Kesavan Muthu
- Interdisplinary Institute of Indian System of Medicine (IIISM) , SRM Institute of Science and Technology , Kattankulathur 603203 , Tamil Nadu , India
| | - Kesavan Karthikeyan
- Department of Chemistry , B. S. Abdur Rahman Crescent Institute of Science and Technology , Vandalur , Chennai 600048 , Tamil Nadu , India
| | - Chandrasekar Praveen
- Materials Electrochemistry Division , Central Electrochemical Research Institute (CSIR-Laboratory) , Alagappapuram , Karaikudi 630003 , Tamil Nadu , India.,Academy of Scientific and Innovative Research (AcSIR) , CECRI campus, Alagappapuram , Karaikudi 630003 , Tamil Nadu , India
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12
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Karunakaran J, Dhatchana Moorthy N, Chowdhury SR, Iqbal S, Majumder HK, Gunasekaran K, Vellaichamy E, Mohanakrishnan AK. Divergent Synthesis and Evaluation of the in vitro Cytotoxicity Profiles of 3,4-Ethylenedioxythiophenyl-2-propen-1-one Analogues. ChemMedChem 2019; 14:1418-1430. [PMID: 31343838 DOI: 10.1002/cmdc.201900225] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Revised: 07/08/2019] [Indexed: 12/18/2022]
Abstract
A new series of 3,4-ethylenedioxythiophene (EDOT)-appended propenones were prepared by condensation reaction and their in vitro cytotoxicity effects were evaluated against five human cancer cell lines. Preliminary structure-activity relationships of EDOT-incorporated 2-propenone derivatives were also established. The EDOT-appended enones demonstrated significant cytotoxicity against human cancer cell lines. The most active analogue, (E)-3-(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)-1-(3,4,5-trimethoxyphenyl)prop-2-en-1-one (3 p, GI50 =110 nm), severely inhibited the clonogenic potential of cancer cells, and induced cell-cycle arrest in the G2/M phase and caused an accumulation of HCT116 colon cancer cells with >4 N DNA content. Also, 3 p exhibited weak inhibition of the enzymatic activity of human topoisomerase I. Molecular docking studies indicated preferential binding of the compounds to the ATP-binding pocket of the human checkpoint 2 kinase (Chk2) catalytic domain, thus, identifying a novel diaryl 2-propenone chemotype for the development of potent inhibitors of Chk2.
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Affiliation(s)
- Jayachandran Karunakaran
- Department of Organic Chemistry, School of Chemistry, University of Madras, Guindy Campus, Chennai, 600025, Tamil Nadu, India
| | - Nachiappan Dhatchana Moorthy
- Department of Biochemistry, University of Madras, Guindy Campus, Chennai, 600025, Tamil Nadu, India.,Department of Biotechnology, Orchid Pharma Limited, Orchid Towers #313, Valluvar Kottam High Road, Nungambakkam, Chennai, 600034, Tamil Nadu, India
| | - Somenath Roy Chowdhury
- Division of Infectious Diseases & Immunology, Indian Institute of Chemical Biology, 4, Raja S. C. Mallick Road, Jadavpur, Kolkata, 700032, West Bengal, India
| | - Saleem Iqbal
- Center for Advanced studies in Crystallography & Biophysics, University of Madras, Guindy Campus, Chennai, 600025, Tamil Nadu, India
| | - Hemanta K Majumder
- Division of Infectious Diseases & Immunology, Indian Institute of Chemical Biology, 4, Raja S. C. Mallick Road, Jadavpur, Kolkata, 700032, West Bengal, India
| | - Krishnasamy Gunasekaran
- Center for Advanced studies in Crystallography & Biophysics, University of Madras, Guindy Campus, Chennai, 600025, Tamil Nadu, India
| | - Elangovan Vellaichamy
- Department of Biochemistry, University of Madras, Guindy Campus, Chennai, 600025, Tamil Nadu, India
| | - Arasambattu K Mohanakrishnan
- Department of Organic Chemistry, School of Chemistry, University of Madras, Guindy Campus, Chennai, 600025, Tamil Nadu, India
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13
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Biagiotti G, Pisaneschi F, Gammon ST, Machetti F, Ligi MC, Giambastiani G, Tuci G, Powell E, Piwnica-Worms H, Pranzini E, Paoli P, Cicchi S, Piwnica-Worms D. Multiwalled Carbon Nanotubes for Combination Therapy: a Biodistribution and Efficacy Pilot Study. J Mater Chem B 2019; 7:2678-2687. [PMID: 31073405 PMCID: PMC6501563 DOI: 10.1039/c8tb03299h] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A drug delivery system (DDS) for combined therapy, based on a short oxidized multiwalled carbon nanotube, is reported. It was prepared exploiting a synthetic approach which allowed loading of two drugs, doxorubicin and metformin, the targeting agent biotin and a radiolabeling tag, to enable labeling with Ga-68 or Cu-64 in order to perform an extensive biodistribution study by PET/CT. The DDS biodistribution profile changes with different administration methods. Once administered at therapeutic doses, the DDS showed a marginal beneficial effect on 4T1 tumor bearing mice, a syngeneic and orthotopic model of triple negative breast cancer, with survival extended by 1 week and 2 days in 20% of the mice. This is encouraging given the aggressiveness of the 4T1 tumor. Furthermore our DDS was well tolerated, ruling out concerns regarding the toxicity of carbon nanotubes.
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Affiliation(s)
- Giacomo Biagiotti
- Department of Chemistry “Ugo Schiff”, Università degli Studi di Firenze, via della Lastruccia 3-13, 50019 Sesto Fiorentino, Firenze, Italy
- Department of Cancer Systems Imaging, Division of Diagnostic Imaging, The University of Texas MD Anderson Cancer Center, 1881 East Road, 77054 Houston, TX, USA
| | - Federica Pisaneschi
- Department of Cancer Systems Imaging, Division of Diagnostic Imaging, The University of Texas MD Anderson Cancer Center, 1881 East Road, 77054 Houston, TX, USA
| | - Seth T. Gammon
- Department of Cancer Systems Imaging, Division of Diagnostic Imaging, The University of Texas MD Anderson Cancer Center, 1881 East Road, 77054 Houston, TX, USA
| | - Fabrizio Machetti
- Department of Chemistry “Ugo Schiff”, Università degli Studi di Firenze, via della Lastruccia 3-13, 50019 Sesto Fiorentino, Firenze, Italy
- Istituto di Chimica dei Composti Organometallici (ICCOM), Consiglio Nazionale delle Ricerche (CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
| | - Maria Cristina Ligi
- Department of Chemistry “Ugo Schiff”, Università degli Studi di Firenze, via della Lastruccia 3-13, 50019 Sesto Fiorentino, Firenze, Italy
- Istituto di Chimica dei Composti Organometallici (ICCOM), Consiglio Nazionale delle Ricerche (CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
| | - Giuliano Giambastiani
- Istituto di Chimica dei Composti Organometallici (ICCOM), Consiglio Nazionale delle Ricerche (CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
- Kazan Federal University, 420008 Kazan, Russian Federation
| | - Giulia Tuci
- Department of Chemistry “Ugo Schiff”, Università degli Studi di Firenze, via della Lastruccia 3-13, 50019 Sesto Fiorentino, Firenze, Italy
- Istituto di Chimica dei Composti Organometallici (ICCOM), Consiglio Nazionale delle Ricerche (CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
| | - Emily Powell
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, 1901 East Road, 77054 Houston, TX USA
| | - Helen Piwnica-Worms
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, 1901 East Road, 77054 Houston, TX USA
| | - Erica Pranzini
- Department of Biomedical, Experimental and Clinical Science “Mario Serio”, Università degli Studi di Firenze, viale Morgagni 50, 50134 Firenze, Italy
| | - Paolo Paoli
- Department of Biomedical, Experimental and Clinical Science “Mario Serio”, Università degli Studi di Firenze, viale Morgagni 50, 50134 Firenze, Italy
| | - Stefano Cicchi
- Department of Chemistry “Ugo Schiff”, Università degli Studi di Firenze, via della Lastruccia 3-13, 50019 Sesto Fiorentino, Firenze, Italy
- Istituto di Chimica dei Composti Organometallici (ICCOM), Consiglio Nazionale delle Ricerche (CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
| | - David Piwnica-Worms
- Department of Cancer Systems Imaging, Division of Diagnostic Imaging, The University of Texas MD Anderson Cancer Center, 1881 East Road, 77054 Houston, TX, USA
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14
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Understanding the Exceptional Properties of Nitroacetamides in Water: A Computational Model Including the Solvent. Molecules 2018; 23:molecules23123308. [PMID: 30551625 PMCID: PMC6320899 DOI: 10.3390/molecules23123308] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2018] [Revised: 12/07/2018] [Accepted: 12/10/2018] [Indexed: 11/22/2022] Open
Abstract
Proton transfer in water involving C–H bonds is a challenge and nitro compounds have been studied for many years as good examples. The effect of substituents on acidity of protons geminal to the nitro group is exploited here with new pKa measurements and electronic structure models, the latter including explicit water environment. Substituents with the amide moiety display an exceptional combination of acidity and solubility in water. In order to find a rationale for the unexpected pKa changes in the (ZZ′)NCO- substituents, we measured and modeled the pKa with Z=Z′=H and Z=Z′=methyl. The dominant contribution to the observed pKa can be understood with advanced computational experiments, where the geminal proton is smoothly moved to the solvent bath. These models, mostly based on density-functional theory (DFT), include the explicit solvent (water) and statistical thermal fluctuations. As a first approximation, the change of pKa can be correlated with the average energy difference between the two tautomeric forms (aci and nitro, respectively). The contribution of the solvent molecules interacting with the solute to the proton transfer mechanism is made evident.
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15
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Syntheses, structures and properties of magnetically active copper(II) compounds with 3-amino-5-(4-methylphenyl)isoxazole. Polyhedron 2018. [DOI: 10.1016/j.poly.2018.02.025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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16
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Agrawal N, Mishra P. The synthetic and therapeutic expedition of isoxazole and its analogs. Med Chem Res 2018; 27:1309-1344. [PMID: 32214770 PMCID: PMC7079875 DOI: 10.1007/s00044-018-2152-6] [Citation(s) in RCA: 85] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Accepted: 02/01/2018] [Indexed: 11/28/2022]
Abstract
Isoxazole, constituting an important family of five-membered heterocycles with one oxygen atom and one nitrogen atom at adjacent positions is of immense importance because of its wide spectrum of biological activities and therapeutic potential. It is, therefore, of prime importance that the development of new synthetic strategies and designing of new isoxazole derivatives should be based on the most recent knowledge emerging from the latest research. This review is an endeavor to highlight the progress in the chemistry and biological activity of isoxazole derivatives which could provide a low-height flying bird's eye view of isoxazole derivatives to the medicinal chemists for the development of clinically viable drugs using this information.
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Affiliation(s)
- Neetu Agrawal
- Institute of Pharmaceutical Research, GLA University, Mathura, U.P. India
| | - Pradeep Mishra
- Institute of Pharmaceutical Research, GLA University, Mathura, U.P. India
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Lai Z, Li Z, Liu Y, Yang P, Fang X, Zhang W, Liu B, Chang H, Xu H, Xu Y. Iron-Mediated Synthesis of Isoxazoles from Alkynes: Using Iron(III) Nitrate as a Nitration and Cyclization Reagent. J Org Chem 2017; 83:145-153. [DOI: 10.1021/acs.joc.7b02483] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Zhenzhen Lai
- College
of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, P. R. China
| | - Zhenxing Li
- State
Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing, Beijing 102249, P. R. China
| | - Yawei Liu
- College
of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, P. R. China
| | - Pengkun Yang
- College
of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, P. R. China
| | - Xiaomin Fang
- College
of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, P. R. China
| | - Wenkai Zhang
- College
of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, P. R. China
| | - Baoying Liu
- College
of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, P. R. China
| | - Haibo Chang
- College
of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, P. R. China
| | - Hao Xu
- College
of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, P. R. China
- State
Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing, Beijing 102249, P. R. China
| | - Yuanqing Xu
- College
of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, P. R. China
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18
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Krishna C, Bhargavi MV, Rao YJ, Krupadanam GLD. Synthesis of pyrano isoxazoline/isoxazole annulated coumarins via intramolecular nitrile oxide cycloaddition and their cytotoxicity. RUSS J GEN CHEM+ 2017. [DOI: 10.1134/s1070363217080345] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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19
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Tkachenko VV, Chebanov VA. Reactions of 3(5)-Aminoisoxazoles Using Classical Methods of Activation, Microwave Irradiation, and Ultrasonication. Chem Heterocycl Compd (N Y) 2017. [DOI: 10.1007/s10593-017-1980-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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20
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Baglieri A, Meschisi L, De Sarlo F, Machetti F. Competitive Copper Catalysis in the Condensation of Primary Nitro Compounds with Terminal Alkynes: Synthesis of Isoxazoles. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600897] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Ausilia Baglieri
- Istituto di chimica dei composti organometallici, c/o Dipartimento di chimica Ugo Schiff; Consiglio nazionale delle ricerche (CNR); Via della Lastruccia 13 50019 Sesto Fiorentino, Firenze Italy
| | - Luca Meschisi
- Dipartimento di chimica Ugo Schiff; Università degli studi di Firenze; Via della Lastruccia 13 50019 Sesto Fiorentino Firenze Italy
| | - Francesco De Sarlo
- Dipartimento di chimica Ugo Schiff; Università degli studi di Firenze; Via della Lastruccia 13 50019 Sesto Fiorentino Firenze Italy
| | - Fabrizio Machetti
- Istituto di chimica dei composti organometallici, c/o Dipartimento di chimica Ugo Schiff; Consiglio nazionale delle ricerche (CNR); Via della Lastruccia 13 50019 Sesto Fiorentino, Firenze Italy
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21
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Zhou X, Xu X, Shi Z, Liu K, Gao H, Li W. Enolate-mediated 1,3-dipolar cycloaddition reaction of β-functionalized ketones with nitrile oxides: direct access to 3,4,5-trisubstituted isoxazoles. Org Biomol Chem 2016; 14:5246-50. [DOI: 10.1039/c6ob00717a] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Enolate-mediated [3 + 2] organocatalytic 1,3-dipolar cycloaddition reactions of β-functionalized ketones with nitrile oxides have been developed. This strategy could generate 3,4,5-trisubstituted isoxazole in high yields and regioselectivities.
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Affiliation(s)
- Xiao Zhou
- School of Pharmacy
- Qingdao University
- Qingdao
- China
| | - Xianhong Xu
- School of Pharmacy
- Qingdao University
- Qingdao
- China
| | - Zhenyan Shi
- School of Pharmacy
- Qingdao University
- Qingdao
- China
| | - Kun Liu
- School of Pharmacy
- Qingdao University
- Qingdao
- China
| | - Hua Gao
- School of Pharmacy
- Qingdao University
- Qingdao
- China
| | - Wenjun Li
- School of Pharmacy
- Qingdao University
- Qingdao
- China
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22
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Perez V, Rabasso N, Fadel A. Synthesis of 5-PhosphonoisoxazolineN-Oxides by SelectiveO-Alkylation of Nitronate Anions. European J Org Chem 2015. [DOI: 10.1002/ejoc.201501243] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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23
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Hu F, Szostak M. Recent Developments in the Synthesis and Reactivity of Isoxazoles: Metal Catalysis and Beyond. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201500319] [Citation(s) in RCA: 220] [Impact Index Per Article: 24.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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24
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Synthesis of Bicyclic Isoxazoles and Isoxazolines via Intramolecular Nitrile Oxide Cycloaddition. Molecules 2015; 20:10910-27. [PMID: 26076111 PMCID: PMC6272556 DOI: 10.3390/molecules200610910] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Revised: 06/01/2015] [Accepted: 06/04/2015] [Indexed: 01/08/2023] Open
Abstract
An efficient and straight forward procedure for the syntheses of bicyclic isoxazole/isoxazoline derivatives from the corresponding dimethyl-2-(2-nitro-1-aryl/alkyl)-2-(prop-2-yn-1yl)malonates or dimethyl 2-allyl-2-(2-nitro-1-aryl/alkyl ethyl)malonate is described. High yields and simple operations are important features of this methodology.
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25
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Galenko AV, Khlebnikov AF, Novikov MS, Pakalnis VV, Rostovskii NV. Recent advances in isoxazole chemistry. RUSSIAN CHEMICAL REVIEWS 2015. [DOI: 10.1070/rcr4503] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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26
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Mower MP, Blackmond DG. Mechanistic Rationalization of Unusual Sigmoidal Kinetic Profiles in the Machetti–De Sarlo Cycloaddition Reaction. J Am Chem Soc 2015; 137:2386-91. [DOI: 10.1021/ja512753v] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Matthew P. Mower
- Department of Chemistry, The Scripps Research Institute, La Jolla, California 92037, United States
| | - Donna G. Blackmond
- Department of Chemistry, The Scripps Research Institute, La Jolla, California 92037, United States
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27
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Zhang W, Wang Y, Bai C, Wen J, Wang N. One-Pot Synthesis of Aliphatic Nitro Compounds by Michael/retro-Claisen Fragmentation Domino Reaction. CHINESE J CHEM 2015. [DOI: 10.1002/cjoc.201400836] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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28
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Gao P, Li HX, Hao XH, Jin DP, Chen DQ, Yan XB, Wu XX, Song XR, Liu XY, Liang YM. Facile Synthesis of Disubstituted Isoxazoles from Homopropargylic Alcohol via C═N Bond Formation. Org Lett 2014; 16:6298-301. [DOI: 10.1021/ol503228x] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Pin Gao
- State Key Laboratory of Applied
Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
| | - Hong-Xia Li
- State Key Laboratory of Applied
Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
| | - Xin-Hua Hao
- State Key Laboratory of Applied
Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
| | - Dong-Po Jin
- State Key Laboratory of Applied
Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
| | - Dao-Qian Chen
- State Key Laboratory of Applied
Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
| | - Xiao-Biao Yan
- State Key Laboratory of Applied
Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
| | - Xin-Xing Wu
- State Key Laboratory of Applied
Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
| | - Xian-Rong Song
- State Key Laboratory of Applied
Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
| | - Xue-Yuan Liu
- State Key Laboratory of Applied
Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
| | - Yong-Min Liang
- State Key Laboratory of Applied
Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
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Biagiotti G, Cicchi S, De Sarlo F, Machetti F. Reactivity of [60]Fullerene with Primary Nitro Compounds: Addition or Catalysed Condensation to Isoxazolo[60]fullerenes. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402990] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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30
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Liu YY, Yang J, Song RJ, Li JH. Synthesis of 5-(Fluoromethyl)-4,5-dihydroisoxazoles by Silver- Catalyzed Oxyfluorination of Unactivated Alkenes. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201400242] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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31
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Raghava B, Parameshwarappa G, Acharya A, Swaroop TR, Rangappa KS, Ila H. Cyclocondensation of Hydroxylamine with 1,3-Bis(het)arylmonothio 1,3-Diketones and 1,3-Bis(het)aryl-3-(methylthio)-2-propenones: Synthesis of 3,5-Bis(het)arylisoxazoles with Complementary Regioselectivity. European J Org Chem 2014. [DOI: 10.1002/ejoc.201301667] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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32
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Gangadhara Chary R, Rajeshwar Reddy G, Ganesh YSS, Vara Prasad K, Raghunadh A, Krishna T, Mukherjee S, Pal M. Effect of Aqueous Polyethylene Glycol on 1,3-Dipolar Cycloaddition of Benzoylnitromethane/Ethyl 2-Nitroacetate with Dipolarophiles: Green Synthesis of Isoxazoles and Isoxazolines. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201300712] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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33
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Liu YY, Yang XH, Yang J, Song RJ, Li JH. Silver-mediated radical cyclization: construction of Δ2-isoxazolines from α-halo ketoximes and 1,3-dicarbonyl compounds. Chem Commun (Camb) 2014; 50:6906-8. [DOI: 10.1039/c4cc02084g] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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34
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Dadiboyena S, Hamme AT. Environmentally Benign Lewis Acid Promoted [2+3]-Dipolar Cycloaddition Reactions of Nitrile Imines with Alkenes in Water. European J Org Chem 2013; 2013:7567-7574. [PMID: 24659908 PMCID: PMC3957226 DOI: 10.1002/ejoc.201300840] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2013] [Indexed: 12/19/2022]
Abstract
Mild and environmentally benign Lewis acid promoted 1,3-dipolar cycloaddition reactions of α-hydrazonyl chlorides with alkenes in water are reported. These α-hydrazonyl chlorides, in the presence of Lewis acids, generate nitrile imines in situ which react with dipolarophiles to furnish the corresponding cycloaddition products. In many cases, the required times for the completion of the Lewis acid promoted 1,3-dipolar cycloaddition reactions in water were comparable to the equivalent reactions performed in an organic solvent. Analogous tetrahexylammonium chloride promoted 1,3-dipolar cycloaddition reactions were also performed. The comparison of reaction times and cycloadduct yields for the aforementioned 1,3-dipolar reactions in aqueous and organic media as well as the proposed role of the Lewis acid in the 1,3-dipolar cycloaddition reaction are described.
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Affiliation(s)
- Sureshbabu Dadiboyena
- Department of Chemistry and Biochemistry, College of Science, Engineering and Technology, 1400 J. R. Lynch Street, Jackson State University, Jackson MS 39217 USA, Fax: +1(601)-979-3674 (Prof. A. T. Hamme II) Homepage: http://www.jsums.edu/chemistry/ashton-t-hamme-ii/
| | - Ashton T. Hamme
- Department of Chemistry and Biochemistry, College of Science, Engineering and Technology, 1400 J. R. Lynch Street, Jackson State University, Jackson MS 39217 USA, Fax: +1(601)-979-3674 (Prof. A. T. Hamme II) Homepage: http://www.jsums.edu/chemistry/ashton-t-hamme-ii/
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35
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Bianchi L, Ghelfi F, Giorgi G, Maccagno M, Petrillo G, Spinelli D, Stenta M, Tavani C. Uncommon 1,2-Migration of a Nitro Group Within a β-Nitrostyryl Moiety: Synthetic Scope and Mechanistic Details. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300856] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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36
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Samai S, Chanda T, Ila H, Singh MS. One-Pot Three-Component Heteroannulation of β-Oxo Dithioesters, Amines and Hydroxylamine: Regioselective, Facile and Straightforward Entry to 5-Substituted 3-Aminoisoxazoles. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300038] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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37
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Guideri L, De Sarlo F, Machetti F. Conjugate Addition versus Cycloaddition/Condensation of Nitro Compounds in Water: Selectivity, Acid-Base Catalysis, and Induction Period. Chemistry 2012; 19:665-77. [DOI: 10.1002/chem.201202698] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2012] [Revised: 08/29/2012] [Indexed: 01/27/2023]
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38
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Sela T, Vigalok A. Salt‐Controlled Selectivity in “on Water” and “in Water” Passerini‐Type Multicomponent Reactions. Adv Synth Catal 2012. [DOI: 10.1002/adsc.201200448] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Tal Sela
- School of Chemistry, The Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel, Fax: (+972)‐3‐640‐6205
| | - Arkadi Vigalok
- School of Chemistry, The Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel, Fax: (+972)‐3‐640‐6205
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39
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Yang Y, Gao M, Deng C, Zhang DX, Wu LM, Shu WM, Wu AX. Synthesis of trisubstituted isoxazoles via in situ trapping strategy from α-nitro carbonyl compounds and methyl ketones or terminal aryl alkenes. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.05.055] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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