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Kalar PL, Jain K, Agrawal S, Khan S, Vishwakarma R, Shivhare A, Deshmukh MM, Das K. Green Synthesis of Electrophilic Alkenes Using a Magnesium Catalyst under Aqueous Conditions and Mechanistic Insights by Density Functional Theory. J Org Chem 2023. [PMID: 38038383 DOI: 10.1021/acs.joc.3c01540] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2023]
Abstract
A green approach for the synthesis of electrophilic alkenes has been developed via Knoevenagel condensation between active methylene compounds and carbonyl compounds using Mg powder under aqueous conditions. In this strategy, Mg(OH)2 acts as a catalyst, which was generated in situ by the reaction between metallic Mg (20 mol %) and water. Mg was found to be an efficient, nontoxic, and inexpensive metal catalyst system for producing a range of electrophilic alkenes in excellent yields (≤98%). A gram-scale synthesis of electrophilic alkenes has been developed, and Mg metal was recovered and recycled up to three times without an appreciable loss of catalytic activity. A catalytic cycle was proposed, and the reaction mechanism was investigated using density functional theory. The key steps are enolization of ethyl cyanoacetate, C-C bond formation, and then regeneration of the catalyst via metathesis with H2O. The overall reaction occurs easily with a maximum ΔG°⧧ value of 7.9 kcal/mol for the rate-determining C-C bond formation step. Our protocol has several advantages and can be further extended to one-pot sequential Knoevenagel condensation and Michael addition, and one-pot sequential Knoevenagel condensation and chemoselective reduction can be used for the synthesis of valuable precursors of pharmaceutical products under green and aqueous conditions.
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Affiliation(s)
- Pankaj Lal Kalar
- Department of Chemistry, School of Chemical Sciences and Technology, Dr. Harisingh Gour Central University, Sagar 470 003, Madhya Pradesh, India
| | - Kavita Jain
- Department of Chemistry, School of Chemical Sciences and Technology, Dr. Harisingh Gour Central University, Sagar 470 003, Madhya Pradesh, India
| | - Swatantra Agrawal
- Department of Chemistry, School of Chemical Sciences and Technology, Dr. Harisingh Gour Central University, Sagar 470 003, Madhya Pradesh, India
| | - Siddique Khan
- Department of Chemistry, School of Chemical Sciences and Technology, Dr. Harisingh Gour Central University, Sagar 470 003, Madhya Pradesh, India
| | - Rampal Vishwakarma
- School of Chemical Science, National Institute of Science Education and Research, OCC of HBNI, Bhubaneswar 752050, Odisha, India
| | - Ayush Shivhare
- Department of Chemistry, School of Chemical Sciences and Technology, Dr. Harisingh Gour Central University, Sagar 470 003, Madhya Pradesh, India
| | - Milind M Deshmukh
- Department of Chemistry, School of Chemical Sciences and Technology, Dr. Harisingh Gour Central University, Sagar 470 003, Madhya Pradesh, India
| | - Kalpataru Das
- Department of Chemistry, School of Chemical Sciences and Technology, Dr. Harisingh Gour Central University, Sagar 470 003, Madhya Pradesh, India
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De Sarlo F, Machetti F. Primary nitro compounds: progress in the synthesis of isoxazoles by condensation with aldehydes or activated ketones. Org Biomol Chem 2023; 21:7255-7266. [PMID: 37646329 DOI: 10.1039/d3ob00960b] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
Among the known strategies directed towards the synthesis of isoxazole derivatives, the reactions of aldehydes with primary nitro compounds deserve a comprehensive treatment, including the historical development as well as the more recent applications. The reactions of aldehydes with primary nitro compounds in a 1 : 2 molar ratio have been shown to lead to isoxazoline-N-oxides or isoxazole derivatives, via β-dinitro derivatives. Several modifications of the process allowed the formation of products bearing substituents at various positions of the heterocyclic ring with control of regioselectivity. Ketones are reported to react with primary nitro compounds, only if activated (β-diketones, α-nitroketones, or strained ketones), to give isoxazole derivatives. Symmetric 2,4-dinitroglutarates formed from aromatic aldehydes and nitroacetate undergo ring closure to form isoxazole derivatives or, according to reaction conditions, 5-hydroxy-6-oxo-4-aryl-6H-1,2-oxazine-3-carboxylates ("oxazinones"), by loss of alcohol instead of water. Isoxazole-4-carbaldehydes are obtained by the reaction of 3-oxetanone with primary nitro compounds.
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Affiliation(s)
- Francesco De Sarlo
- Dipartimento di Chimica "Ugo Schiff" dell' Università degli Studi di Firenze, Via della Lastruccia 13, 50019 Sesto Fiorentino, Firenze, Italy
| | - Fabrizio Machetti
- Istituto di Chimica dei Composti Organometallici del Consiglio Nazionale delle Ricerche c/o Dipartimento di Chimica "Ugo Schiff" dell' Università degli Studi di Firenze, Via della Lastruccia 13, 50019 Sesto Fiorentino, Firenze, Italy.
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3
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Tang S, Chen X, Ke Y, Wang F, Yan X. Voltage-Controlled Divergent Cascade of Electrochemical Reactions for Characterization of Lipids at Multiple Isomer Levels Using Mass Spectrometry. Anal Chem 2022; 94:12750-12756. [PMID: 36087069 PMCID: PMC10386884 DOI: 10.1021/acs.analchem.2c02375] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cascading divergent reactions in a single system is highly desirable for their intrinsic efficiency and potential to achieve multilevel structural characterization of complex biomolecules. In this work, two electrochemical reactions, interfacial electro-epoxidation and cobalt anodic corrosion, are divergently cascaded in nanoelectrospray (nESI) and can be switched at different voltages. We applied these reactions to lipid identification at multiple isomer levels using mass spectrometry (MS), which remains a great challenge in structural lipidomics. The divergent cascade reactions in situ derivatize lipids to produce epoxidized lipids and cobalt-adducted lipids at different voltages. These lipids are then fragmented upon low-energy collision-induced dissociation (CID), generating diagnostic fragments to indicate C═C locations and sn-positions that cannot be achieved by the low-energy CID of native lipids. We have demonstrated that lipid structural isomers show significantly different profiles in the analysis of healthy and cancerous mouse prostate samples using this strategy. The application of divergent cascade reactions in lipid identification allows the four-in-one analysis of lipid headgroups, fatty acyl chains, C═C locations, and sn-positions simply by tuning the nESI voltages within a single experiment. This feature as well as its low sample consumption, no need for an extra apparatus, and quantitative analysis capability show its great potential in lipidomics.
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Affiliation(s)
- Shuli Tang
- Department of Chemistry, Texas A&M University, 580 Ross Street, College Station, Texas 77843, United States
| | - Xi Chen
- Department of Chemistry, Texas A&M University, 580 Ross Street, College Station, Texas 77843, United States
| | - Yuepeng Ke
- Center for Translational Cancer Research, Texas A&M Institute of Biosciences and Technology, Texas A&M University, Houston, Texas 77030, United States
| | - Fen Wang
- Center for Translational Cancer Research, Texas A&M Institute of Biosciences and Technology, Texas A&M University, Houston, Texas 77030, United States
| | - Xin Yan
- Department of Chemistry, Texas A&M University, 580 Ross Street, College Station, Texas 77843, United States
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Das S, Chanda K. An overview of metal-free synthetic routes to isoxazoles: the privileged scaffold. RSC Adv 2021; 11:32680-32705. [PMID: 35493554 PMCID: PMC9042182 DOI: 10.1039/d1ra04624a] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Accepted: 09/11/2021] [Indexed: 12/19/2022] Open
Abstract
In the field of drug discovery, isoxazole is a five-membered heterocyclic moiety commonly found in many commercially available drugs. In view of their enormous significance, it is always imperative to unleash new eco-friendly synthetic strategies. Among various novel synthetic techniques in use for isoxazole synthesis, most synthetic methods employ Cu(i) or Ru(ii) as catalysts for (3 + 2) cycloaddition reaction. The particular disadvantages associated with metal-catalyzed reactions are high costs, low abundance, toxicity, a significant generation of waste, and difficulty to separate from the reaction mixtures. In view of these drawbacks, it is always imperative to develop alternate metal-free synthetic routes. This review article highlights a comprehensive overview on the potential application of metal-free synthetic routes for the synthesis of isoxazoles with significant biological interests.
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Affiliation(s)
- Soumyadip Das
- Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology Vellore-632014 India
| | - Kaushik Chanda
- Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology Vellore-632014 India
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5
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Fershtat LL, Teslenko FE. Five-Membered Hetarene N-Oxides: Recent Advances in Synthesis and Reactivity. SYNTHESIS-STUTTGART 2021. [DOI: 10.1055/a-1529-7678] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
AbstractFive-membered heterocyclic N-oxides attract special attention due to their significant potential applications in medicinal chemistry and advanced materials science. In this regard, novel methods for their synthesis and functionalization are in constant demand. In this short review, recent state-of-the-art achievements in the chemistry of isoxazoline N-oxides, 1,2,3-triazole 1-oxides and 1,2,5-oxadiazole 2-oxides are summarized. The main routes involving transition-metal-catalyzed and metal-free functionalization protocols along with mechanistic considerations are outlined. The transformations of these hetarene N-oxide rings as precursors to other nitrogen heterocyclic systems are also presented.1 Introduction2 Isoxazoline N-Oxides3 1,2,3-Triazole 1-Oxides4 1,2,5-Oxadiazole 2-Oxides5 Conclusion
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Affiliation(s)
- Leonid L. Fershtat
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences
- National Research University Higher School of Economics
| | - Fedor E. Teslenko
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences
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6
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Synthesis, biological evaluation, molecular docking and in silico ADMET screening studies of novel isoxazoline derivatives from acridone. ARAB J CHEM 2021. [DOI: 10.1016/j.arabjc.2021.103057] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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7
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Luo X, Liu S, Lan Y. Mechanism and Regioselectivity of 1,3‐Dipolar Cycloaddition of Nitrile Oxides to 3‐Methylene Oxindole: A Density Functional Theory Study. ChemistrySelect 2020. [DOI: 10.1002/slct.202002672] [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)
- Xiaoling Luo
- Chongqing Key Laboratory of Inorganic Functional Materials, College of ChemistryChongqing Normal University Chongqing 401331 China
| | - Song Liu
- Chongqing Key Laboratory of Theoretical and Computational ChemistrySchool of Chemistry and Chemical EngineeringChongqing University Chongqing 400030 China
| | - Yu Lan
- Chongqing Key Laboratory of Theoretical and Computational ChemistrySchool of Chemistry and Chemical EngineeringChongqing University Chongqing 400030 China
- College of Chemistryand Institute of Green CatalysisZhengzhou University Zhengzhou Henan 450001 China
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8
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Mukaijo Y, Yokoyama S, Nishiwaki N. Comparison of Substituting Ability of Nitronate versus Enolate for Direct Substitution of a Nitro Group. Molecules 2020; 25:molecules25092048. [PMID: 32353998 PMCID: PMC7248694 DOI: 10.3390/molecules25092048] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 04/21/2020] [Accepted: 04/23/2020] [Indexed: 12/16/2022] Open
Abstract
α-Nitrocinnamate underwent the conjugate addition of an active methylene compound such as nitroacetate, 1,3-dicarbonyl compound, or α-nitroketone, and the following ring closure afforded functionalized heterocyclic frameworks. The reaction of cinnamate with nitroacetate occurs via nucleophilic substitution of a nitro group by the O-attack of the nitronate, which results in isoxazoline N-oxide. This protocol was applicable to 1,3-dicarbonyl compounds to afford dihydrofuran derivatives, including those derived from direct substitution of a nitro group caused by O-attack of enolate. It was found the reactivity was lowered by an electron-withdrawing group on the carbonyl moiety. When α-nitroketone was employed as a substrate, three kinds of products were possibly formed; of these, only isoxazoline N-oxide was identified. This result indicates that the substituting ability of nitronate is higher than that of enolate for the direct SN2 substitution of a nitro group.
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Affiliation(s)
- Yusuke Mukaijo
- School of Environmental Science and Engineering, Kochi University of Technology, Tosayamada, Kami, Kochi 782-8502, Japan; (Y.M.); (S.Y.)
| | - Soichi Yokoyama
- School of Environmental Science and Engineering, Kochi University of Technology, Tosayamada, Kami, Kochi 782-8502, Japan; (Y.M.); (S.Y.)
- Research Center for Molecular Design, Kochi University of Technology, Tosayamada, Kami, Kochi 782-8502, Japan
- The Institute of Scientific and Industrial Research, Osaka University, Mihogaoka, Ibaraki, Osaka 567-0047, Japan
| | - Nagatoshi Nishiwaki
- School of Environmental Science and Engineering, Kochi University of Technology, Tosayamada, Kami, Kochi 782-8502, Japan; (Y.M.); (S.Y.)
- Research Center for Molecular Design, Kochi University of Technology, Tosayamada, Kami, Kochi 782-8502, Japan
- Correspondence: ; Tel.: +81-887-57-2517
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9
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The versatility of DABCO: synthetic applications of its basic, nucleophilic, and catalytic properties Part 1. Catalysis of Morita–Baylis–Hillman and Knoevenagel reactions. Chem Heterocycl Compd (N Y) 2020. [DOI: 10.1007/s10593-020-02636-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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10
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Smirnov AY, Zaitseva ER, Belozerova OA, Alekseyev RS, Baleeva NS, Zagudaylova MB, Mikhaylov AA, Baranov MS. Nitroacetic Esters in the Regioselective Synthesis of Isoxazole-3,5-dicarboxylic Acid Derivatives. J Org Chem 2019; 84:15417-15428. [PMID: 31702147 DOI: 10.1021/acs.joc.9b02427] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An efficient and high-yielding strategy to prepare "unsymmetrical" 4-aryl-isoxazol-3,5-dicarboxylic acid derivatives from nitroacetic esters and aromatic aldehydes has been developed. The strategy is based on the isolation and usage of the previously missed intermediate of the Dornow reaction-5-hydroxy-6-oxo-4-aryl-6H-1,2-oxazine-3-carboxylates. In addition, the mechanism of the Dornow reaction was partially revised.
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Affiliation(s)
- Alexander Yu Smirnov
- Institute of Bioorganic Chemistry , Russian Academy of Sciences , Miklukho-Maklaya 16/10 , Moscow 117997 , Russia
| | - Elvira R Zaitseva
- Institute of Bioorganic Chemistry , Russian Academy of Sciences , Miklukho-Maklaya 16/10 , Moscow 117997 , Russia.,D. Mendeleev University of Chemical Technology of Russia , 9 Miusskaya Square , Moscow 125047 , Russia
| | - Olga A Belozerova
- Institute of Bioorganic Chemistry , Russian Academy of Sciences , Miklukho-Maklaya 16/10 , Moscow 117997 , Russia
| | - Roman S Alekseyev
- Department of Chemistry , M.V. Lomonosov Moscow State University , Moscow 119991 , Russia
| | - Nadezhda S Baleeva
- Institute of Bioorganic Chemistry , Russian Academy of Sciences , Miklukho-Maklaya 16/10 , Moscow 117997 , Russia
| | - Marina B Zagudaylova
- Institute of Bioorganic Chemistry , Russian Academy of Sciences , Miklukho-Maklaya 16/10 , Moscow 117997 , Russia
| | - Andrey A Mikhaylov
- Institute of Bioorganic Chemistry , Russian Academy of Sciences , Miklukho-Maklaya 16/10 , Moscow 117997 , Russia
| | - Mikhail S Baranov
- Institute of Bioorganic Chemistry , Russian Academy of Sciences , Miklukho-Maklaya 16/10 , Moscow 117997 , Russia.,Pirogov Russian National Research Medical University , Ostrovitianov 1 , Moscow 117997 , Russia
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11
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Shen HJ, Duan YN, Zheng K, Zhang C. Redetermination of the Structure of a Water-Soluble Hypervalent Iodine(V) Reagent AIBX and Its Synthetic Utility in the Oxidation of Alcohols and Synthesis of Isoxazoline N-Oxides. J Org Chem 2019; 84:14381-14393. [DOI: 10.1021/acs.joc.9b02328] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hui-Jie Shen
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Ya-Nan Duan
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Ke Zheng
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Chi Zhang
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
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12
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Maksimenko AS, Kislyi VP, Chernysheva NB, Strelenko YA, Zubavichus YV, Khrustalev VN, Semenova MN, Semenov VV. Effective Synthesis of 3,4-Diaryl-isoxazole-5-carboxamides and their Antiproliferative Properties. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900643] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Anna S. Maksimenko
- N. D. Zelinsky Institute of Organic Chemistry RAS; 47 Leninsky Prospect 119991 Moscow Russian Federation
| | - Victor P. Kislyi
- N. D. Zelinsky Institute of Organic Chemistry RAS; 47 Leninsky Prospect 119991 Moscow Russian Federation
| | - Natalia B. Chernysheva
- N. D. Zelinsky Institute of Organic Chemistry RAS; 47 Leninsky Prospect 119991 Moscow Russian Federation
| | - Yuri A. Strelenko
- N. D. Zelinsky Institute of Organic Chemistry RAS; 47 Leninsky Prospect 119991 Moscow Russian Federation
| | - Yan V. Zubavichus
- Russian Research Centre “Kurchatov Institute”; Kurchatov sq. 1 123182 Moscow Russian Federation
| | - Victor N. Khrustalev
- Peoples' Friendship University of Russia (RUDN University); 117198 Moscow Russian Federation
| | - Marina N. Semenova
- N. K. Koltzov Institute of Developmental Biology RAS; 26 Vavilov Street 119334 Moscow Russian Federation
| | - Victor V. Semenov
- N. D. Zelinsky Institute of Organic Chemistry RAS; 47 Leninsky Prospect 119991 Moscow Russian Federation
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13
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Feng KW, Ban YL, Yuan PF, Lei WL, Liu Q, Fang R. Synthesis of 4-Oxoisoxazoline N-Oxides via Pd-Catalyzed Cyclization of Propargylic Alcohols with tert-Butyl Nitrite. Org Lett 2019; 21:3131-3135. [DOI: 10.1021/acs.orglett.9b00811] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kai-Wen Feng
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, 222 South Tianshui Road, Lanzhou 730000, P.R. China
| | - Yong-Liang Ban
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, 222 South Tianshui Road, Lanzhou 730000, P.R. China
| | - Pan-Feng Yuan
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, 222 South Tianshui Road, Lanzhou 730000, P.R. China
| | - Wen-Long Lei
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, 222 South Tianshui Road, Lanzhou 730000, P.R. China
| | - Qiang Liu
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, 222 South Tianshui Road, Lanzhou 730000, P.R. China
| | - Ran Fang
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, 222 South Tianshui Road, Lanzhou 730000, P.R. China
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14
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Sahoo SC, Pan SC. Catalytic Enantioselective Synthesis of 3,4,5-Trisubstituted Isoxazoline N
-Oxides and Regioselective Synthesis of 3,4,5-Trisubstituted Isoxazoles. European J Org Chem 2019. [DOI: 10.1002/ejoc.201801693] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Subas Chandra Sahoo
- Department of Chemistry; Indian Institute of Technology Guwahati; 781039 Assam India
| | - Subhas Chandra Pan
- Department of Chemistry; Indian Institute of Technology Guwahati; 781039 Assam India
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Asahara H, Sofue A, Kuroda Y, Nishiwaki N. Alkynylation and Cyanation of Alkenes Using Diverse Properties of a Nitro Group. J Org Chem 2018; 83:13691-13699. [DOI: 10.1021/acs.joc.8b01865] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Haruyasu Asahara
- Division of Applied Chemistry, Graduate School of Engineering, Osaka University, Yamadaoka 2-1, Suita, Osaka 565-0871, Japan
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Condition‐Based Selective Synthesis of 3,4,5‐Trisubstituted Isoxazoline N
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oxides, 4,5‐Dihydroisoxazoles and Isoxazoles. ChemistrySelect 2018. [DOI: 10.1002/slct.201800839] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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17
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Tanaka K, Kishimoto M, Hoshino Y, Honda K. Temperature-controlled divergent synthesis of 4-alkoxy- or 4-alkenyl-chromanes via inverse electron-demand cycloaddition with in situ generated ortho-quinone methides. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.03.090] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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18
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Morita T, Yugandar S, Fuse S, Nakamura H. Recent progresses in the synthesis of functionalized isoxazoles. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.02.020] [Citation(s) in RCA: 58] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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19
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Zlotin SG, Churakov AM, Dalinger IL, Luk’yanov OA, Makhova NN, Sukhorukov AY, Tartakovsky VA. Recent advances in synthesis of organic nitrogen–oxygen systems for medicine and materials science. MENDELEEV COMMUNICATIONS 2017. [DOI: 10.1016/j.mencom.2017.11.001] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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