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Xu B, Liu X, Deng L, Shang Y, Jie X, Su W. Dehydrogenative synthesis of N-functionalized 2-aminophenols from cyclohexanones and amines: Molecular complexities via one-shot assembly. SCIENCE ADVANCES 2024; 10:eadn7656. [PMID: 38691610 PMCID: PMC11062582 DOI: 10.1126/sciadv.adn7656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Accepted: 03/28/2024] [Indexed: 05/03/2024]
Abstract
Polyfunctionalized arenes are privileged structural motifs in both academic and industrial chemistry. Conventional methods for accessing this class of chemicals usually involve stepwise modification of phenyl rings, often necessitating expensive noble metal catalysts and suffering from low reactivity and selectivity when introducing multiple functionalities. We herein report dehydrogenative synthesis of N-functionalized 2-aminophenols from cyclohexanones and amines. The developed reaction system enables incorporating amino and hydroxyl groups into aromatic rings in a one-shot fashion, which simplifies polyfunctionalized 2-aminophenol synthesis by circumventing issues associated with traditional arene modifications. The wide substrate scope and excellent functional group tolerance are exemplified by late-stage modification of complex natural products and pharmaceuticals that are unattainable by existing methods. This dehydrogenative protocol benefits from using 2,2,6,6-tetramethylpiperidine 1-oxyl (TEMPO) as oxidant that offers interesting chemo- and regio-selective oxidation processes. More notably, the essential role of in situ generated water is disclosed, which protects aliphatic amine moieties from overoxidation via hydrogen bond-enabled interaction.
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Affiliation(s)
- Biping Xu
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou 350002, China
- Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, Fujian 350108, China
| | - Xiaojie Liu
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou 350002, China
- Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, Fujian 350108, China
| | - Lei Deng
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou 350002, China
- College of Chemistry, Fuzhou University, Fuzhou 350108, China
| | - Yaping Shang
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou 350002, China
- Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, Fujian 350108, China
| | - Xiaoming Jie
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou 350002, China
- Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, Fujian 350108, China
| | - Weiping Su
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou 350002, China
- Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, Fujian 350108, China
- College of Chemistry, Fuzhou University, Fuzhou 350108, China
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2
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Yu X, Huang N, Huo Y, Li X, Liu Y, Maruoka K, Chen Q. Photoredox-Mediated Aerobic Oxidative Cleavage of 1,3-Diketones to Access 1,2-Diketones and ( Z)-1,4-Enediones. Org Lett 2024. [PMID: 38175988 DOI: 10.1021/acs.orglett.3c04247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2024]
Abstract
An aerobic oxidative cleavage of 1,3-diketones under visible light irradiation using an organic dye as a photocatalyst is disclosed. The newly developed reaction provides practical access to 1,2-diketones and (Z)-1,4-enediones in moderate to good yields with absolute regio- and stereoselectivity. Mechanistic studies of the reaction suggest that tetraketone intermediates might undergo a photocatalytic energy transfer from the excited photocatalyst to form biradical-like (n,π*) states of ketones.
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Affiliation(s)
- Xiaofeng Yu
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China
| | - Nan Huang
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China
| | - Yanping Huo
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China
| | - Xianwei Li
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China
| | - Yan Liu
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China
| | - Keiji Maruoka
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China
- Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto 606-8501, Japan
| | - Qian Chen
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China
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3
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Abstract
Nitroxides, also known as nitroxyl radicals, are long-lived or stable radicals with the general structure R1R2N-O•. The spin distribution over the nitroxide N and O atoms contributes to the thermodynamic stability of these radicals. The presence of bulky N-substituents R1 and R2 prevents nitroxide radical dimerization, ensuring their kinetic stability. Despite their reactivity toward various transient C radicals, some nitroxides can be easily stored under air at room temperature. Furthermore, nitroxides can be oxidized to oxoammonium salts (R1R2N═O+) or reduced to anions (R1R2N-O-), enabling them to act as valuable oxidants or reductants depending on their oxidation state. Therefore, they exhibit interesting reactivity across all three oxidation states. Due to these fascinating properties, nitroxides find extensive applications in diverse fields such as biochemistry, medicinal chemistry, materials science, and organic synthesis. This review focuses on the versatile applications of nitroxides in organic synthesis. For their use in other important fields, we will refer to several review articles. The introductory part provides a brief overview of the history of nitroxide chemistry. Subsequently, the key methods for preparing nitroxides are discussed, followed by an examination of their structural diversity and physical properties. The main portion of this review is dedicated to oxidation reactions, wherein parent nitroxides or their corresponding oxoammonium salts serve as active species. It will be demonstrated that various functional groups (such as alcohols, amines, enolates, and alkanes among others) can be efficiently oxidized. These oxidations can be carried out using nitroxides as catalysts in combination with various stoichiometric terminal oxidants. By reducing nitroxides to their corresponding anions, they become effective reducing reagents with intriguing applications in organic synthesis. Nitroxides possess the ability to selectively react with transient radicals, making them useful for terminating radical cascade reactions by forming alkoxyamines. Depending on their structure, alkoxyamines exhibit weak C-O bonds, allowing for the thermal generation of C radicals through reversible C-O bond cleavage. Such thermally generated C radicals can participate in various radical transformations, as discussed toward the end of this review. Furthermore, the application of this strategy in natural product synthesis will be presented.
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Affiliation(s)
- Dirk Leifert
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität, Corrensstrasse 40, 48149 Münster, Germany
| | - Armido Studer
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität, Corrensstrasse 40, 48149 Münster, Germany
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4
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Luo Y, Lv L, Li Z. Copper-Catalyzed Germyl-Azidation of Alkenes with Germanium Hydrides and Trimethylsilyl Azide. Org Lett 2022; 24:8052-8056. [DOI: 10.1021/acs.orglett.2c03302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yani Luo
- Key Laboratory of Advanced Light Conversion Materials and Biophotonics, Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Leiyang Lv
- Key Laboratory of Advanced Light Conversion Materials and Biophotonics, Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Zhiping Li
- Key Laboratory of Advanced Light Conversion Materials and Biophotonics, Department of Chemistry, Renmin University of China, Beijing 100872, China
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5
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Kayser AK, Wolczanski PT, Cundari TR, Bollmeyer MM, Lancaster KM, MacMillan SN. TEMPO coordination and reactivity in group 6; pseudo-pentagonal planar (η 2-TEMPO) 2CrX (X = Cl, TEMPO). Chem Commun (Camb) 2022; 58:9818-9821. [PMID: 35975596 DOI: 10.1039/d2cc03838b] [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
The exposure of CrCl2(THF)2 to 1 equiv. of TEMPO and 1 equiv. [TEMPO]Na afforded (η2-O,N-TEMPO)2CrCl (1, 67%); addition of [TEMPO]Na to 1 yielded (η2-O,N-TEMPO)2Cr(TEMPO) (2). Both 1 and 2 exhibit pseudo-pentagonal planar (PPP) geometry, instead of myriad alternatives. Calculations and spectral studies suggest the solid-state geometry persists in solution.
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Affiliation(s)
- Ann K Kayser
- Dept. of Chemistry and Chemical Biology Baker Laboratory, Cornell University, Ithaca, NY, 14853, USA.
| | - Peter T Wolczanski
- Dept. of Chemistry and Chemical Biology Baker Laboratory, Cornell University, Ithaca, NY, 14853, USA.
| | - Thomas R Cundari
- Dept. of Chemistry, CasCam, University of North Texas, Denton, TX, 76201, USA
| | - Melissa M Bollmeyer
- Dept. of Chemistry and Chemical Biology Baker Laboratory, Cornell University, Ithaca, NY, 14853, USA.
| | - Kyle M Lancaster
- Dept. of Chemistry and Chemical Biology Baker Laboratory, Cornell University, Ithaca, NY, 14853, USA.
| | - Samantha N MacMillan
- Dept. of Chemistry and Chemical Biology Baker Laboratory, Cornell University, Ithaca, NY, 14853, USA.
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6
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Qu Z, Tian T, Deng GJ, Huang H. Diverse catalytic systems for nitrogen-heterocycle formation from O-acyl ketoximes. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2022.05.079] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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7
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Guo X, Li M, Wang J, Li C, Hu X, Jin L, Sun N, Hu B, Shen Z. Heterogeneous Catalysis for Oxidation of Alcohol via 1‐Methyl‐2‐azaadamanane
N
‐oxyl Immobilized on Magnetic Polystyrene Nanosphere. ChemistrySelect 2022. [DOI: 10.1002/slct.202200009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Xiaqun Guo
- College of Chemical Engineering Zhejiang University of Technology Hangzhou Zhejiang Province 310014 China
| | - Meichao Li
- College of Chemical Engineering Zhejiang University of Technology Hangzhou Zhejiang Province 310014 China
| | - Jianli Wang
- College of Chemical Engineering Zhejiang University of Technology Hangzhou Zhejiang Province 310014 China
| | - Chunmei Li
- College of Chemical Engineering Zhejiang University of Technology Hangzhou Zhejiang Province 310014 China
- Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process School of Chemistry and Chemical Engineering Shaoxing University Shaoxing Zhejiang Province 312000 China
| | - Xinquan Hu
- College of Chemical Engineering Zhejiang University of Technology Hangzhou Zhejiang Province 310014 China
| | - Liqun Jin
- College of Chemical Engineering Zhejiang University of Technology Hangzhou Zhejiang Province 310014 China
| | - Nan Sun
- College of Chemical Engineering Zhejiang University of Technology Hangzhou Zhejiang Province 310014 China
| | - Baoxiang Hu
- College of Chemical Engineering Zhejiang University of Technology Hangzhou Zhejiang Province 310014 China
| | - Zhenlu Shen
- College of Chemical Engineering Zhejiang University of Technology Hangzhou Zhejiang Province 310014 China
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8
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Ma CH, Ji Y, Zhao J, He X, Zhang ST, Jiang YQ, Jiang YQ. Transition-metal-free three-component acetalation-pyridylation of alkenes via photoredox catalysis. CHINESE JOURNAL OF CATALYSIS 2022. [DOI: 10.1016/s1872-2067(21)63917-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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9
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Wang A, Liu YZ, Shen Z, Qiao Z, Ma X. Regioselective Synthesis of Pyrazolo[1,5- a]pyridine via TEMPO-Mediated [3 + 2] Annulation-Aromatization of N-Aminopyridines and α,β-Unsaturated Compounds. Org Lett 2022; 24:1454-1459. [PMID: 35166547 DOI: 10.1021/acs.orglett.2c00035] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A TEMPO-mediated [3 + 2] annulation-aromatization protocol for the preparation of pyrazolo[1,5-a]pyridines from N-aminopyridines and α,β-unsaturated compounds was developed. The procedure offered multisubstituted pyrazolo[1,5-a]pyridines in good to excellent yield with high and predictable regioselectivity. The modification of marketed drugs including Loratadine, Abiraterone, and Metochalcone, and a one-pot three-step gram scale synthesis of key intermediate for the preparation of Selpercatinib were demonstrated. Mechanism studies show that TEMPO serves both as a Lewis acid and as an oxidant.
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Affiliation(s)
- Amu Wang
- Natural Products Research Centre, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, People's Republic of China.,University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Ya-Zhou Liu
- Natural Products Research Centre, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, People's Republic of China
| | - Zhongke Shen
- Natural Products Research Centre, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, People's Republic of China.,University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Zeen Qiao
- Natural Products Research Centre, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, People's Republic of China
| | - Xiaofeng Ma
- Natural Products Research Centre, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, People's Republic of China
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10
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Kong Y, Cao T, Zhu S. TEMPO‐Regulated
Regio‐ and Stereoselective
Cross‐Dihalogenation
with Dual Electrophilic X
+
Reagents. CHINESE J CHEM 2021. [DOI: 10.1002/cjoc.202100472] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Yi Kong
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology Guangzhou Guangdong 510640 China
| | - Tongxiang Cao
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology Guangzhou Guangdong 510640 China
| | - Shifa Zhu
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology Guangzhou Guangdong 510640 China
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11
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Alidoust S, Zamani M, Jabbari M. Adsorption of free radical TEMPO onto Al 2O 3 nanoparticles and evaluation of radical scavenging activity. Free Radic Res 2021; 55:937-949. [PMID: 34525892 DOI: 10.1080/10715762.2021.1981543] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
This study describes the adsorption of free radical TEMPO onto Al2O3 nanoparticles in the solvents with different polarities including DMF, methanol, acetone, THF, petroleum ether and n-hexane at ambient temperature to evaluate the radical scavenging activity. The adsorption percentage of radical is calculated by measuring the maximum adsorption intensity of the ultraviolet (UV) absorption spectrum of TEMPO in the presence and the absence of Al2O3 nanoparticles. The morphology of Al2O3 nanoparticles before and after adsorption of TEMPO is studied using transmission electron microscopy (TEM), X-ray diffraction (XRD) and Fourier-transform infrared (FT-IR) spectroscopy. The adsorption energy and other thermochemical data for the adsorption of TEMPO over different active sites of Al2O3 are estimated via dispersion corrected density functional theory (DFT + Disp). The donor-acceptor interactions between Al2O3 and TEMPO are calculated using natural bond orbital (NBO) theory. It is found that Al2O3 nanoparticles have efficient radical scavenging activity (RSA) in the range of 50-72%. Approximately, a linear relationship between dielectric constant of solvent and the absorption percentage of TEMPO over Al2O3 nanoparticles is achieved. So that with decreasing the polarity of solvent, the adsorption of TEMPO onto Al2O3 nanoparticles is increased. The adsorption of TEMPO over Lewis acidic sites of Al2O3 is more favored than Brønsted acidic and basic sites. The comparison between experimental and calculated IR spectra of TEMPO/Al2O3 complexes provides the good evidence for adsorption of TEMPO onto the surface of Al2O3 nanoparticles.
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Affiliation(s)
- Soheyl Alidoust
- School of Chemistry, Damghan University, Damghan 36716-41167, Iran
| | - Mehdi Zamani
- School of Chemistry, Damghan University, Damghan 36716-41167, Iran
| | - Morteza Jabbari
- School of Chemistry, Damghan University, Damghan 36716-41167, Iran
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12
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Rao MS, Hussain S. TEMPO-mediated aerobic oxidative synthesis of 2-aryl benzoxazoles via ring-opening of benzoxazoles with benzylamines. SYNTHETIC COMMUN 2021. [DOI: 10.1080/00397911.2021.1949476] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
| | - Sahid Hussain
- Department of Chemistry, Indian Institute of Technology Patna, Patna, India
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13
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Tian Y, Guo X, Li M, Li C, Hu X, Jin L, Sun N, Hu B, Shen Z. SBA-15 Supported 1-Methyl-2-azaadamanane N-Oxyl (1-Me-AZADO) as Recyclable Catalyst for Oxidation of Alcohol. Org Lett 2021; 23:3928-3932. [PMID: 33971715 DOI: 10.1021/acs.orglett.1c01058] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Herein, we designed and synthesized an SBA-15 supported 1-methyl-2-azaadamanane N-oxyl (1-Me-AZADO) and investigated its catalytic performance for selective oxidation of alcohols under Anelli's conditions. The first example of immobilization of 1-Me-AZADO was very important to advance the oxgenation effectively because this supported N-oxyl has excellent catalytic activity for oxidation of alcohols to carbonyl compounds, and more importantly, it can be conveniently recovered and reused at least 6 times without significant effect on its catalytic efficiency.
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Affiliation(s)
- Yangwu Tian
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Xiaqun Guo
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Meichao Li
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Chunmei Li
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China.,Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process, School of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing, 312000, China
| | - Xinquan Hu
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Liqun Jin
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Nan Sun
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Baoxiang Hu
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Zhenlu Shen
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
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14
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Tao YF, He YJ, Ye JZ, Yang X, Yang YY, Xie GG, Liu LX, Du GB, Zhang H, Zhou B. Cochineal quinone carbon dot synthesis via a keto–enol tautomerism strategy and their intermolecular photo-induced cross-redox interactions with tetracycline. NEW J CHEM 2021. [DOI: 10.1039/d1nj02701h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Specific molecular recognition of tetracycline by carminic acid-formed carbon dots taking advantage of the common quinone molecular structural unit.
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Affiliation(s)
- Yun-Feng Tao
- Key Laboratory of Forest Resources Conservation and Utilization in the Southwest Mountains of China, Ministry of Education, Yunnan Province Key Lab of Wood Adhesives and Glued Products, College of Life Science, Southwest Forestry University, Kunming 650224, P. R. China
| | - Yu-Juan He
- Key Laboratory of Forest Resources Conservation and Utilization in the Southwest Mountains of China, Ministry of Education, Yunnan Province Key Lab of Wood Adhesives and Glued Products, College of Life Science, Southwest Forestry University, Kunming 650224, P. R. China
| | - Jin-Zhi Ye
- Key Laboratory of Forest Resources Conservation and Utilization in the Southwest Mountains of China, Ministry of Education, Yunnan Province Key Lab of Wood Adhesives and Glued Products, College of Life Science, Southwest Forestry University, Kunming 650224, P. R. China
| | - Xiao Yang
- Key Laboratory of Forest Resources Conservation and Utilization in the Southwest Mountains of China, Ministry of Education, Yunnan Province Key Lab of Wood Adhesives and Glued Products, College of Life Science, Southwest Forestry University, Kunming 650224, P. R. China
| | - Ying-Ying Yang
- Key Laboratory of Forest Resources Conservation and Utilization in the Southwest Mountains of China, Ministry of Education, Yunnan Province Key Lab of Wood Adhesives and Glued Products, College of Life Science, Southwest Forestry University, Kunming 650224, P. R. China
| | - Ge-Ge Xie
- Key Laboratory of Forest Resources Conservation and Utilization in the Southwest Mountains of China, Ministry of Education, Yunnan Province Key Lab of Wood Adhesives and Glued Products, College of Life Science, Southwest Forestry University, Kunming 650224, P. R. China
| | - Lan-Xiang Liu
- Research Institute of Resource Insects, Chinese Academy of Forestry, Kunming 650224, P. R. China
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, P. R. China
| | - Guan-Ben Du
- Key Laboratory of Forest Resources Conservation and Utilization in the Southwest Mountains of China, Ministry of Education, Yunnan Province Key Lab of Wood Adhesives and Glued Products, College of Life Science, Southwest Forestry University, Kunming 650224, P. R. China
| | - Hong Zhang
- Research Institute of Resource Insects, Chinese Academy of Forestry, Kunming 650224, P. R. China
| | - Bei Zhou
- Key Laboratory of Forest Resources Conservation and Utilization in the Southwest Mountains of China, Ministry of Education, Yunnan Province Key Lab of Wood Adhesives and Glued Products, College of Life Science, Southwest Forestry University, Kunming 650224, P. R. China
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, P. R. China
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15
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Lee JW, Lim S, Maienshein DN, Liu P, Ngai MY. Redox-Neutral TEMPO Catalysis: Direct Radical (Hetero)Aryl C-H Di- and Trifluoromethoxylation. Angew Chem Int Ed Engl 2020; 59:21475-21480. [PMID: 32830430 PMCID: PMC7720849 DOI: 10.1002/anie.202009490] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 08/12/2020] [Indexed: 12/15/2022]
Abstract
Applications of TEMPO. catalysis for the development of redox-neutral transformations are rare. Reported here is the first TEMPO. -catalyzed, redox-neutral C-H di- and trifluoromethoxylation of (hetero)arenes. The reaction exhibits a broad substrate scope, has high functional-group tolerance, and can be employed for the late-stage functionalization of complex druglike molecules. Kinetic measurements, isolation and resubjection of catalytic intermediates, UV/Vis studies, and DFT calculations support the proposed oxidative TEMPO. /TEMPO+ redox catalytic cycle. Mechanistic studies also suggest that Li2 CO3 plays an important role in preventing catalyst deactivation. These findings will provide new insights into the design and development of novel reactions through redox-neutral TEMPO. catalysis.
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Affiliation(s)
- Johnny W Lee
- Department of Chemistry and Institute of Chemical Biology and Drug Discovery, State University of New York, Stony Brook, NY, 11794, USA
| | - Sanghyun Lim
- Department of Chemistry and Institute of Chemical Biology and Drug Discovery, State University of New York, Stony Brook, NY, 11794, USA
| | - Daniel N Maienshein
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, 15260, USA
| | - Peng Liu
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, 15260, USA
| | - Ming-Yu Ngai
- Department of Chemistry and Institute of Chemical Biology and Drug Discovery, State University of New York, Stony Brook, NY, 11794, USA
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16
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17
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McDonald TR, Mills LR, West MS, Rousseaux SAL. Selective Carbon–Carbon Bond Cleavage of Cyclopropanols. Chem Rev 2020; 121:3-79. [DOI: 10.1021/acs.chemrev.0c00346] [Citation(s) in RCA: 99] [Impact Index Per Article: 24.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Tyler R. McDonald
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON M5S 3H6, Canada
| | - L. Reginald Mills
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON M5S 3H6, Canada
| | - Michael S. West
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON M5S 3H6, Canada
| | - Sophie A. L. Rousseaux
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON M5S 3H6, Canada
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18
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Lee JW, Lim S, Maienshein DN, Liu P, Ngai M. Redox‐Neutral TEMPO Catalysis: Direct Radical (Hetero)Aryl C−H Di‐ and Trifluoromethoxylation. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202009490] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Johnny W. Lee
- Department of Chemistry and Institute of Chemical Biology and Drug Discovery State University of New York Stony Brook NY 11794 USA
| | - Sanghyun Lim
- Department of Chemistry and Institute of Chemical Biology and Drug Discovery State University of New York Stony Brook NY 11794 USA
| | | | - Peng Liu
- Department of Chemistry University of Pittsburgh Pittsburgh PA 15260 USA
| | - Ming‐Yu Ngai
- Department of Chemistry and Institute of Chemical Biology and Drug Discovery State University of New York Stony Brook NY 11794 USA
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19
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Siddiqui AM, Khalid A, Khan A, Azad CS, Samim M, Khan IA. N‐Heterocyclic Carbene/Cobalt Cooperative Catalysis for the Chemo‐ and Regioselective C−N Bond Formation between Aldehyde and Amines/Amides. ChemCatChem 2020. [DOI: 10.1002/cctc.202000156] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Asher M. Siddiqui
- Department of Chemistry School of Chemical and Life Sciences Jamia Hamdard New Delhi 110062 India
| | - Anam Khalid
- Department of Chemistry School of Chemical and Life Sciences Jamia Hamdard New Delhi 110062 India
| | - Arif Khan
- Department of Chemistry School of Chemical and Life Sciences Jamia Hamdard New Delhi 110062 India
| | - Chandra S. Azad
- School of Pharmaceutical Science and Technology Tianjin University Tianjin 300072 P.R. China
| | - Mohd. Samim
- Department of Chemistry School of Chemical and Life Sciences Jamia Hamdard New Delhi 110062 India
| | - Imran A. Khan
- Department of Chemistry School of Chemical and Life Sciences Jamia Hamdard New Delhi 110062 India
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Lv H, Laishram RD, Yang Y, Li J, Xu D, Zhan Y, Luo Y, Su Z, More S, Fan B. TEMPO catalyzed oxidative dehydrogenation of hydrazobenzenes to azobenzenes. Org Biomol Chem 2020; 18:3471-3474. [PMID: 32319504 DOI: 10.1039/d0ob00103a] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
A metal-free direct oxidative dehydrogenation approach for the synthesis of azobenzenes from hydrazobenzenes has been developed by using TEMPO as an organocatalyst for the first time. The reaction proceeded in open air under mild reaction conditions. A wide range of hydrazobenzenes readily undergo dehydrogenation to give the corresponding azobenzenes in excellent yields.
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Affiliation(s)
- Haiping Lv
- Chongqing Academy of Chinese Materia Medica, Chongqing, 400065, China.
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