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Jo J, Kim S, Park S, Kim S, Lee S, Choi JH, Chung WJ. Study on Pyridine-Boryl Radical-Promoted, Ketyl Radical-Mediated Carbon-Carbon Bond-Forming Reactions. J Org Chem 2024; 89:8985-9000. [PMID: 38861548 DOI: 10.1021/acs.joc.4c00946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2024]
Abstract
Ketyl radicals are synthetically versatile reactive species, but their applications have been hampered by harsh generation conditions employing highly reducing metals. Recently, the pyridine-boryl radical received wide attention as a promising organic reductant because of its mildness as well as convenience in handling. While probing the utility of the pyridine-boryl radical, our group observed facile pinacol coupling reactivity that had not been known at that time. This serendipitous finding was successfully rendered into a practical synthesis of tetraaryl-1,2-diols in up to 99% yield within 1 h. Subsequently, upon examinations of various reaction manifolds, a diastereoselective ketyl-olefin cyclization was accomplished to produce cycloalkanols such as trans-2-alkyl-1-indanols. Compared to the previous methods, the stereocontrolling ability was considerably enhanced by taking advantage of the structurally modifiable boryl group that would be present near the bond-forming site. In this full account, our synthetic efforts with the O-boryl ketyl radicals are disclosed in detail, covering the discovery, optimization, scope expansion, and mechanistic analysis, including density functional theory (DFT) calculations.
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Affiliation(s)
- Junhyuk Jo
- Department of Chemistry, GIST, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Republic of Korea
| | - Somi Kim
- Department of Chemistry, GIST, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Republic of Korea
| | - Seonyoung Park
- Department of Chemistry, GIST, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Republic of Korea
| | - Seonyul Kim
- Department of Chemistry, GIST, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Republic of Korea
| | - Sunggi Lee
- Department of Physics and Chemistry, DGIST, 333 Techno jungang-daero, Hyeonpung-eup, Dalseong-gun, Daegu 42988, Republic of Korea
| | - Jun-Ho Choi
- Department of Chemistry, GIST, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Republic of Korea
| | - Won-Jin Chung
- Department of Chemistry, GIST, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Republic of Korea
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2
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Hao X, Feng D, Chen H, Huang P, Guo F. Mechanochemical Nickel-Catalyzed Carbon-Sulfur Bond Formation between Aryl Iodides and Aromatic Sulfur Surrogates. Chemistry 2023; 29:e202302119. [PMID: 37556506 DOI: 10.1002/chem.202302119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 07/27/2023] [Accepted: 08/09/2023] [Indexed: 08/11/2023]
Abstract
The formation of aromatic thioethers from C-S coupling is of great importance in synthetic chemistry. Traditional solution strategies through transition-metal catalysis generally require bulk solution, heat, and longer reaction time. Herein, a mechano-promoted sulfenylation of aryl iodides with nickel catalysis is described. The active aromatic sulfide agents are in-situ generated from aromatic thiol or disulfide and subsequently adapted in the nickel catalytic cycle, with a tolerance of broad substituted groups under optimized conditions. In addition to the gram-scale synthesis that reveals the application potential of the method, the radical trapping and competitive experiments are also conducted for the mechanistic study, thus providing a plausible mechanism rationally. Furthermore, the proposed methodology is certificated as being versatile and following the green principles with ideal calculated values of green chemistry metrics, and the comparison with other approaches for C-S bond formation is also demonstrated.
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Affiliation(s)
- Xiujia Hao
- College of Chemistry, Liaoning University, 110036, Shenyang, Liaoning, China
| | - Daming Feng
- College of Chemistry, Liaoning University, 110036, Shenyang, Liaoning, China
| | - Hongguang Chen
- College of Chemistry, Liaoning University, 110036, Shenyang, Liaoning, China
| | - Peng Huang
- College of Chemistry, Liaoning University, 110036, Shenyang, Liaoning, China
- Judicial Authentication & Forensic Sciences Institute, Liaoning University, 110036, Shenyang, Liaoning, China
| | - Fang Guo
- College of Chemistry, Liaoning University, 110036, Shenyang, Liaoning, China
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3
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Salinas G, Kuhn A, Arnaboldi S. Self-Sustained Rotation of Lorentz Force-Driven Janus Systems. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2023; 127:14704-14710. [PMID: 37554549 PMCID: PMC10405271 DOI: 10.1021/acs.jpcc.3c01597] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Revised: 06/12/2023] [Indexed: 08/10/2023]
Abstract
Rotation is an interesting type of motion that is currently involved in many technological applications. In this frame, different and sophisticated external stimuli to induce rotation have been developed. In this work, we have designed a simple and original self-propelled bimetallic Janus rotor powered by the synergy between a spontaneous electric and ionic current, produced by two coupled redox reactions, and a magnetic field, placed orthogonal to the surface of the device. Such a combination induces a magnetohydrodynamic vortex at each extremity of the rotor arm, which generates an overall driving force able to propel the rotor. Furthermore, the motion of the self-polarized object can be controlled by the direction of the spontaneous electric current or the orientation of the external magnetic field, resulting in a predictable clockwise or anticlockwise motion. In addition, these devices exhibit directional corkscrew-type displacement, when representing their displacement as a function of time, producing time-space specular behavior. The concept can be used to design alternative self-mixing systems for a variety of (micro)fluidic equipment.
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Affiliation(s)
- Gerardo Salinas
- Université
Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33607 Pessac, France
| | - Alexander Kuhn
- Université
Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33607 Pessac, France
| | - Serena Arnaboldi
- Dipartimento
di Chimica, Universita degli Studi di Milano, 20133 Milano, Italy
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Eskandari M, Jadidi K, Notash B. Substrate-Controlled Diastereo- and Enantiodivergent Synthesis of Bis-Spirocyclopropyloxindoles from Available Isatin as a Single Starting Material. J Org Chem 2023; 88:5254-5274. [PMID: 37083424 DOI: 10.1021/acs.joc.2c02452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/22/2023]
Abstract
The first diastereo- and enantiodivergent asymmetric synthesis of new bis-spirocyclopropyloxindole scaffolds has been accomplished from the readily available isatin as a single starting material. Four rel-(1R,2R,3R), rel-(1S,2S,3R), rel-(1R,2R,3S), and rel-(1S,2S,3S) configurations of desired products were constructed in excellent enantiopurity via a simple switch in substrates using the chiral auxiliary-controlled method. The absolute configuration of cycloadducts with three contiguous quaternary/tertiary stereogenic centers was confirmed through X-ray diffraction analysis. A facile synthesis of versatile precursor 3-chlorooxindoles was also introduced.
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Affiliation(s)
- Mehdi Eskandari
- Faculty of Chemistry and Petroleum Sciences, Department of Organic Chemistry, Shahid Beheshti University, Tehran 1983963113, Iran
| | - Khosrow Jadidi
- Faculty of Chemistry and Petroleum Sciences, Department of Organic Chemistry, Shahid Beheshti University, Tehran 1983963113, Iran
| | - Behrouz Notash
- Faculty of Chemistry and Petroleum Sciences, Department of Inorganic Chemistry, Shahid Beheshti University, Tehran 1983969411, Iran
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Zn-Catalyzed Regioselective and Chemoselective Reduction of Aldehydes, Ketones and Imines. Int J Mol Sci 2022; 23:ijms232012679. [PMID: 36293541 PMCID: PMC9604354 DOI: 10.3390/ijms232012679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 10/10/2022] [Accepted: 10/16/2022] [Indexed: 01/24/2023] Open
Abstract
An operationally convenient Zn-catalyzed synthesis of alcohols by the reduction of aldehydes, ketones, and α,β-unsaturated aldehydes/ketones is reported. It is a rare example of using mild and sustainable HBpin as a reductant for catalytic reduction of carbonyl compounds in the absence of acid or base as hydrolysis reagent. The reaction is upscalable and proceeds in high selectivity without the formation of boronate ester by-products, and tolerates sensitive functionalities, such as iodo, bromo, chloro, fluoro, nitro, trifluoromethyl, aminomethyl, alkynyl, and amide. The Zn(OAc)2/HBpin combination has been also proved to be chemoselective for the C=N reduction of imine analogs.
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Azetidin-2-one-based small molecules as dual hHDAC6/HDAC8 inhibitors: Investigation of their mechanism of action and impact of dual inhibition profile on cell viability. Eur J Med Chem 2022; 238:114409. [DOI: 10.1016/j.ejmech.2022.114409] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Revised: 04/11/2022] [Accepted: 04/20/2022] [Indexed: 01/28/2023]
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7
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Novichikhina NP, Shestakov AS, Skoptsova AA, Ashrafova ZE, Stolpovskaya NV, Kosheleva EA, Shatalov GV, Ledenyova IV, Shikhaliev KS. Synthesis of New 1-Hydroxy-4H-pyrrolo[3,2,1-ij]quinolin-2(1H)-one Derivatives. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2021. [DOI: 10.1134/s1070428021100043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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8
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Mohan A, Peter J, Rout L, Thomas AM, Nagappan S, Zhang WJ, Parambadath S, Park SS, Ha CS. In situ thermosensitive hybrid mesoporous silica: preparation and the catalytic activities for carbonyl compound reduction. Dalton Trans 2021; 50:11730-11741. [PMID: 34296727 DOI: 10.1039/d1dt00323b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this study, free-radical polymerisation inside MCM-41 mesopores was examined to expose a construction route for a temperature-responsive switchable polymer-silica nanohybrid material with well-defined porosity. Herein, we introduced a vinyl monomer (N-isopropyl acrylamide), a cross-linker, and an AIBN initiator into the palladium nanoparticle incorporated MCM-41 pore channels using the wet-impregnation method followed by in situ radical polymerisation. The structural properties of the synthesised PNIPAM-PdNP-MCM-41 catalyst were analysed by various sophisticated analytical techniques. The temperature switchable nanohybrid catalyst was used to reduce carbonyl compounds to their corresponding alcohols. The catalyst showed high catalytic efficiency and robustness in an aqueous medium at 25 °C. Moreover, the system's polymer layer remarkably boosted catalytic selectivity and activity for carbonyl compound reduction as compared to other controlled catalysts. The suggested switchable system can be employed as a temperature-controllable heterogeneous catalyst and highlights a substitute technique to counter the methodical insufficiency in switchable supported molecular catalytic system production.
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Affiliation(s)
- Anandhu Mohan
- Department of Polymer Science and Engineering, School of Chemical Engineering, Pusan National University, Busan 46241, Republic of Korea.
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Chang CC, Li CY, Tsai YH, El-Shazly M, Wei CK, Yang ZJ, Chen SL, Wu CC, Wu YC, Chang FR. Bioactive polyketides from the pathogenic fungus of Epicoccum sorghinum. PLANTA 2021; 253:116. [PMID: 33956231 DOI: 10.1007/s00425-021-03635-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2021] [Accepted: 04/24/2021] [Indexed: 06/12/2023]
Abstract
We discovered and identified a series of characteristic substances, including one new polyketide, epicorepoxydon B, of the important pathogenic fungus, Epicoccum sorghinum, of sorghum. The fungal extract and some isolated polyketides are sensitive to a malignant triple-negative breast cancer cell line, MDA-MB-231. Sorghum (Kaoliang) grain is an important crop with high economic value and several applications. In Taiwan, sorghum has been used in the wine industry, and "Kinmen Kaoliang Liquor" is a well-known Asian brand. Fungal contamination is one of the major threats affecting the production of sorghum grain resulting in economic losses as well as human and animal health problems. Several fungal species can infect sorghum grain and generate some toxic secondary metabolites. Epicoccum sorghinum is one of the major fungal contaminants of sorghum grains and a potent producer of mycotoxins such as tenuazonic acid (TeA). However, except for TeA, few studies focused on chemical compounds produced by this fungus. To explore the potential biological and toxic effects of E. sorghinum, a chemical investigation was carried out on the ethyl acetate extract of the fungus because it showed cytotoxic activity against a triple-negative breast cancer cell line, MDA-MB-231 (54.82% inhibition at 20 µg/mL). One new polyketide, epicorepoxydon B (1), along with six known compounds including 4,5-dihydroxy-6-(6'-methylsalicyloxy)-2-hydroxymethyl-2-cyclohexenl-one (2), epicorepoxydon A (3), 3-hydroxybenzyl alcohol (4), 6-methylsalicylic acid (5), gentisyl alcohol (6), and 6-(hydroxymethyl)benzene-1,2,4-triol (7) were obtained, and their structures were established by the interpretation of their MS and NMR spectroscopic data. The cytotoxic activity of all isolated polyketides 1-7 was evaluated, and compounds 2, 6, and 7 exhibited potent activities against A549, HepG2, and MDA-MB-231 human cancer cell lines with IC50 value ranging from 1.86 to 18.31 μM. The structure-activity relationship of the isolated compounds was proposed.
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Affiliation(s)
- Ching-Chia Chang
- Graduate Institute of Natural Products, College of Pharmacy, Kaohsiung Medical University, Kaohsiung, 807, Taiwan
| | - Chi-Ying Li
- Department of Pharmacology and Pharmaceutical Sciences, School of Pharmacy, University of Southern California, 1985 Zonal Avenue, Los Angeles, CA, 90089, USA
| | - Yi-Hong Tsai
- Graduate Institute of Natural Products, College of Pharmacy, Kaohsiung Medical University, Kaohsiung, 807, Taiwan
| | - Mohamed El-Shazly
- Department of Pharmacognosy, Faculty of Pharmacy, Ain-Shams University, Organization of African Unity Street, Abassia, 11566, Cairo, Egypt
- Department of Pharmaceutical Biology, Faculty of Pharmacy and Biotechnology, The German University in Cairo, Cairo, 11835, Egypt
| | - Chien-Kei Wei
- Graduate Institute of Natural Products, College of Pharmacy, Kaohsiung Medical University, Kaohsiung, 807, Taiwan
| | - Zih-Jie Yang
- Graduate Institute of Natural Products, College of Pharmacy, Kaohsiung Medical University, Kaohsiung, 807, Taiwan
| | - Shu-Li Chen
- Graduate Institute of Natural Products, College of Pharmacy, Kaohsiung Medical University, Kaohsiung, 807, Taiwan
| | - Chin-Chung Wu
- Graduate Institute of Natural Products, College of Pharmacy, Kaohsiung Medical University, Kaohsiung, 807, Taiwan
| | - Yang-Chang Wu
- Graduate Institute of Integrated Medicine, China Medical University, Taichung, 404, Taiwan
- Chinese Medicine Research and Development Center, China Medical University Hospital, Taichung, 404, Taiwan
| | - Fang-Rong Chang
- Graduate Institute of Natural Products, College of Pharmacy, Kaohsiung Medical University, Kaohsiung, 807, Taiwan.
- Drug Development and Value Creation Research Center, Kaohsiung Medical University, Kaohsiung, 807, Taiwan.
- Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, 807, Taiwan.
- Department of Marine Biotechnology and Resources, National Sun Yat-sen University, Kaohsiung, 804, Taiwan.
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10
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Yu TY, Pang H, Cao Y, Gallou F, Lipshutz BH. Safe, Scalable, Inexpensive, and Mild Nickel-Catalyzed Migita-Like C-S Cross-Couplings in Recyclable Water. Angew Chem Int Ed Engl 2021; 60:3708-3713. [PMID: 33095957 DOI: 10.1002/anie.202013017] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2020] [Indexed: 01/20/2023]
Abstract
A new approach to C-S couplings is reported that relies on nickel catalysis under mild conditions, enabled by micellar catalysis in recyclable water as the reaction medium. The protocol tolerates a wide range of heteroaromatic halides and thiols, including alkyl and heteroaryl thiols, leading to a variety of thioethers in good isolated yields. The method is scalable, results in low residual metal in the products, and is applicable to syntheses of targets in the pharmaceutical area. The procedure also features an associated low E Factor, suggesting a far more attractive entry than is otherwise currently available, especially those based on unsustainable loadings of Pd catalysts.
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Affiliation(s)
- Tzu-Yu Yu
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA, 93106, USA
| | - Haobo Pang
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA, 93106, USA
| | - Yilin Cao
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA, 93106, USA
| | | | - Bruce H Lipshutz
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA, 93106, USA
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11
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Yu T, Pang H, Cao Y, Gallou F, Lipshutz BH. Safe, Scalable, Inexpensive, and Mild Nickel‐Catalyzed Migita‐Like C−S Cross‐Couplings in Recyclable Water. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202013017] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Tzu‐Yu Yu
- Department of Chemistry and Biochemistry University of California Santa Barbara CA 93106 USA
| | - Haobo Pang
- Department of Chemistry and Biochemistry University of California Santa Barbara CA 93106 USA
| | - Yilin Cao
- Department of Chemistry and Biochemistry University of California Santa Barbara CA 93106 USA
| | | | - Bruce H. Lipshutz
- Department of Chemistry and Biochemistry University of California Santa Barbara CA 93106 USA
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12
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Li J, Wang H, Qiu Z, Huang CY, Li CJ. Metal-Free Direct Deoxygenative Borylation of Aldehydes and Ketones. J Am Chem Soc 2020; 142:13011-13020. [DOI: 10.1021/jacs.0c03813] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Jianbin Li
- Department of Chemistry and FRQNT Centre for Green Chemistry and Catalysis, McGill University, 801 Sherbrooke Street W, Montreal, Quebec H3A 0B8, Canada
| | - Haining Wang
- Department of Chemistry and FRQNT Centre for Green Chemistry and Catalysis, McGill University, 801 Sherbrooke Street W, Montreal, Quebec H3A 0B8, Canada
| | - Zihang Qiu
- Department of Chemistry and FRQNT Centre for Green Chemistry and Catalysis, McGill University, 801 Sherbrooke Street W, Montreal, Quebec H3A 0B8, Canada
| | - Chia-Yu Huang
- Department of Chemistry and FRQNT Centre for Green Chemistry and Catalysis, McGill University, 801 Sherbrooke Street W, Montreal, Quebec H3A 0B8, Canada
| | - Chao-Jun Li
- Department of Chemistry and FRQNT Centre for Green Chemistry and Catalysis, McGill University, 801 Sherbrooke Street W, Montreal, Quebec H3A 0B8, Canada
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13
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Farooq S, Ngaini Z. One Pot and Two Pot Synthetic Strategies and Biological Applications of Epoxy-Chalcones. CHEMISTRY AFRICA 2020. [DOI: 10.1007/s42250-020-00128-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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14
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Zhou Z, Xu Y, Zhu B, Li P, Hu G, Yang F, Xu S, Zhang X. One-pot synthesis of 3-hydroxy-2-oxindoles via acyloin rearrangements of 2-hydroxy-indolin-3-ones generated in situ from 2-alkynyl arylazides. NEW J CHEM 2020. [DOI: 10.1039/d0nj04588h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A novel one-pot method to prepare 3-hydroxy-2-oxindoles via acyloin rearrangements of 2-hydroxy-indolin-3-ones generated in situ from 2-alkynyl arylazides has been described.
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Affiliation(s)
- Zhiqiang Zhou
- Co-Innovation Center for Efficient Processing and Utilization of Forest Products
- College of Chemical Engineering
- Nanjing Forestry University
- Nanjing 210037
- China
| | - Yao Xu
- Co-Innovation Center for Efficient Processing and Utilization of Forest Products
- College of Chemical Engineering
- Nanjing Forestry University
- Nanjing 210037
- China
| | - Boyu Zhu
- Co-Innovation Center for Efficient Processing and Utilization of Forest Products
- College of Chemical Engineering
- Nanjing Forestry University
- Nanjing 210037
- China
| | - Ping Li
- Co-Innovation Center for Efficient Processing and Utilization of Forest Products
- College of Chemical Engineering
- Nanjing Forestry University
- Nanjing 210037
- China
| | - Guiwen Hu
- Co-Innovation Center for Efficient Processing and Utilization of Forest Products
- College of Chemical Engineering
- Nanjing Forestry University
- Nanjing 210037
- China
| | - Fan Yang
- Co-Innovation Center for Efficient Processing and Utilization of Forest Products
- College of Chemical Engineering
- Nanjing Forestry University
- Nanjing 210037
- China
| | - Shijie Xu
- Co-Innovation Center for Efficient Processing and Utilization of Forest Products
- College of Chemical Engineering
- Nanjing Forestry University
- Nanjing 210037
- China
| | - Xiaoxiang Zhang
- Co-Innovation Center for Efficient Processing and Utilization of Forest Products
- College of Chemical Engineering
- Nanjing Forestry University
- Nanjing 210037
- China
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15
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Qiu Z, Pham HDM, Li J, Li CC, Castillo-Pazos DJ, Khaliullin RZ, Li CJ. Light-enabled metal-free pinacol coupling by hydrazine. Chem Sci 2019; 10:10937-10943. [PMID: 32190250 PMCID: PMC7066673 DOI: 10.1039/c9sc03737c] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Accepted: 10/06/2019] [Indexed: 11/21/2022] Open
Abstract
A light-driven pinacol coupling protocol without any metals, but with N2H4 as a clean non-metallic hydrogen-atom-transfer (HAT) reductant was described.
Efficient carbon–carbon bond formation is of great importance in modern organic synthetic chemistry. The pinacol coupling discovered over a century ago is still one of the most efficient coupling reactions to build the C–C bond in one step. However, traditional pinacol coupling often requires over-stoichiometric amounts of active metals as reductants, causing long-lasting metal waste issues and sustainability concerns. A great scientific challenge is to design a metal-free approach to the pinacol coupling reaction. Herein, we describe a light-driven pinacol coupling protocol without use of any metals, but with N2H4, used as a clean non-metallic hydrogen-atom-transfer (HAT) reductant. In this transformation, only traceless non-toxic N2 and H2 gases were produced as by-products with a relatively broad aromatic ketone scope and good functional group tolerance. A combined experimental and computational investigation of the mechanism suggests that this novel pinacol coupling reaction proceeds via a HAT process between photo-excited ketone and N2H4, instead of the common single-electron-transfer (SET) process for metal reductants.
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Affiliation(s)
- Zihang Qiu
- Department of Chemistry , FQRNT Centre for Green Chemistry and Catalysis , McGill University , 801 Sherbrooke St. W. , Montreal , Quebec H3A 0B8 , Canada . ;
| | - Hanh D M Pham
- Department of Chemistry , FQRNT Centre for Green Chemistry and Catalysis , McGill University , 801 Sherbrooke St. W. , Montreal , Quebec H3A 0B8 , Canada . ;
| | - Jianbin Li
- Department of Chemistry , FQRNT Centre for Green Chemistry and Catalysis , McGill University , 801 Sherbrooke St. W. , Montreal , Quebec H3A 0B8 , Canada . ;
| | - Chen-Chen Li
- Department of Chemistry , FQRNT Centre for Green Chemistry and Catalysis , McGill University , 801 Sherbrooke St. W. , Montreal , Quebec H3A 0B8 , Canada . ;
| | - Durbis J Castillo-Pazos
- Department of Chemistry , FQRNT Centre for Green Chemistry and Catalysis , McGill University , 801 Sherbrooke St. W. , Montreal , Quebec H3A 0B8 , Canada . ;
| | - Rustam Z Khaliullin
- Department of Chemistry , FQRNT Centre for Green Chemistry and Catalysis , McGill University , 801 Sherbrooke St. W. , Montreal , Quebec H3A 0B8 , Canada . ;
| | - Chao-Jun Li
- Department of Chemistry , FQRNT Centre for Green Chemistry and Catalysis , McGill University , 801 Sherbrooke St. W. , Montreal , Quebec H3A 0B8 , Canada . ;
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16
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Rocco D, Chiarotto I, D'Anna F, Mattiello L, Pandolfi F, Rizzo C, Feroci M. Cathodic Behaviour of Dicationic Imidazolium Bromides: The Role of the Spacer. ChemElectroChem 2019. [DOI: 10.1002/celc.201900099] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Daniele Rocco
- Department Scienze di Base e Applicate per l'Ingegneria (SBAI)Sapienza University of Rome via Castro Laurenziano, 7 00161 Roma Italy
| | - Isabella Chiarotto
- Department Scienze di Base e Applicate per l'Ingegneria (SBAI)Sapienza University of Rome via Castro Laurenziano, 7 00161 Roma Italy
| | - Francesca D'Anna
- Università degli Studi di PalermoDipartimento di Scienze e Tecnologie Biologiche Chimiche e Farmaceutiche Viale delle Scienze, Ed. 17 90128 Palermo Italy
| | - Leonardo Mattiello
- Department Scienze di Base e Applicate per l'Ingegneria (SBAI)Sapienza University of Rome via Castro Laurenziano, 7 00161 Roma Italy
| | - Fabiana Pandolfi
- Department Scienze di Base e Applicate per l'Ingegneria (SBAI)Sapienza University of Rome via Castro Laurenziano, 7 00161 Roma Italy
| | - Carla Rizzo
- Università degli Studi di PalermoDipartimento di Scienze e Tecnologie Biologiche Chimiche e Farmaceutiche Viale delle Scienze, Ed. 17 90128 Palermo Italy
| | - Marta Feroci
- Department Scienze di Base e Applicate per l'Ingegneria (SBAI)Sapienza University of Rome via Castro Laurenziano, 7 00161 Roma Italy
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17
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Miyata Y, Sagata K, Yamazaki Y, Teramura H, Hirano Y, Ogino C, Kita Y. Mechanism of the Fe-Assisted Hydrothermal Liquefaction of Lignocellulosic Biomass. Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.8b03725] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yoshinori Miyata
- New Business Planning Department, Nippon Shokubai Co., Ltd., Suita, Osaka 564-8512, Japan
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18
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Assoah B, Vale JR, Kalenius E, Veiros LF, Candeias NR. Lewis Base Catalyzed Intramolecular Reduction of Salicylaldehydes by Pinacol-Derived Chlorohydrosilane. European J Org Chem 2018. [DOI: 10.1002/ejoc.201800544] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Benedicta Assoah
- Laboratory of Chemistry and Bioengineering; Tampere University of Technology; Korkeakoulunkatu 8 33101 Tampere Finland
| | - João R. Vale
- Laboratory of Chemistry and Bioengineering; Tampere University of Technology; Korkeakoulunkatu 8 33101 Tampere Finland
- Instituto de Investigação do Medicamento (iMed.ULisboa); Faculdade de Farmácia; Universidade de Lisboa; Av. Prof. Gama Pinto 1649-003 Lisboa Portugal
| | - Elina Kalenius
- University of Jyväskylä; Department of Chemistry; Nanoscience Center; Jyväskylä Finland
| | - Luis F. Veiros
- Centro de Química Estrutural; Instituto Superior Técnico; Universidade de Lisboa; Av. Rovisco Pais No. 1 1049-001 Lisboa Portugal
| | - Nuno R. Candeias
- Laboratory of Chemistry and Bioengineering; Tampere University of Technology; Korkeakoulunkatu 8 33101 Tampere Finland
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