1
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zheng H, Chen X, Zuo J, Ye J, Zhao C, Xu J. Syntheses of spiro-oxindoles via KI/oxone-mediated oxidation/cyclization of homotryptamine and homotryptophol derivatives. Tetrahedron 2023. [DOI: 10.1016/j.tet.2023.133386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
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2
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Electrochemical oxidative bromolactonization of unsaturated carboxylic acids with sodium bromide: Synthesis of bromomethylated γ-lactones. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2021.153567] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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3
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Kaur A, Gehlawat A, Prakash R, Pandey SK. Enantioselective Total Synthesis of Sacubitril. ChemistrySelect 2021. [DOI: 10.1002/slct.202102506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Amanpreet Kaur
- School of Chemistry and Biochemistry Thapar Institute of Engineering and Technology Patiala 147 001 India
| | - Anju Gehlawat
- School of Chemistry and Biochemistry Thapar Institute of Engineering and Technology Patiala 147 001 India
| | - Ranjana Prakash
- School of Chemistry and Biochemistry Thapar Institute of Engineering and Technology Patiala 147 001 India
| | - Satyendra Kumar Pandey
- School of Chemistry and Biochemistry Thapar Institute of Engineering and Technology Patiala 147 001 India
- Department of Chemistry Institute of Science Banaras Hindu University Varanasi 221 005 India
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4
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Hur J, Jang J, Sim J. A Review of the Pharmacological Activities and Recent Synthetic Advances of γ-Butyrolactones. Int J Mol Sci 2021; 22:2769. [PMID: 33803380 PMCID: PMC7967234 DOI: 10.3390/ijms22052769] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 02/26/2021] [Accepted: 03/03/2021] [Indexed: 02/06/2023] Open
Abstract
γ-Butyrolactone, a five-membered lactone moiety, is one of the privileged structures of diverse natural products and biologically active small molecules. Because of their broad spectrum of biological and pharmacological activities, synthetic methods for γ-butyrolactones have received significant attention from synthetic and medicinal chemists for decades. Recently, new developments and improvements in traditional methods have been reported by considering synthetic efficiency, feasibility, and green chemistry. In this review, the pharmacological activities of natural and synthetic γ-butyrolactones are described, including their structures and bioassay methods. Mainly, we summarize recent advances, occurring during the past decade, in the construction of γ-butyrolactone classified based on the bond formation in γ-butyrolactone between (i) C5-O1 bond, (ii) C4-C5 and C2-O1 bonds, (iii) C3-C4 and C2-O1 bonds, (iv) C3-C4 and C5-O1 bonds, (v) C2-C3 and C2-O1 bonds, (vi) C3-C4 bond, and (vii) C2-O1 bond. In addition, the application to the total synthesis of natural products bearing γ-butyrolactone scaffolds is described.
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Affiliation(s)
- Joonseong Hur
- Natural Products Research Institute, Korea Institute of Science and Technology (KIST), 679 Saimdang-ro, Gangneung 25451, Korea;
| | - Jaebong Jang
- College of Pharmacy, Korea University, Sejong 30019, Korea
| | - Jaehoon Sim
- College of Pharmacy, Chungnam National University, Daejeon 34134, Korea
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5
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Rai V, Sorabad GS, Maddani MR. Facile and direct halogenation of 1,2,3-triazoles promoted by a KX–oxone system under transition metal free conditions. NEW J CHEM 2021. [DOI: 10.1039/d0nj05170e] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A convenient and efficient oxidative halogenation of 4-aryl 1,2,3-triazoles is realized at ambient temperature under transition metal free conditions.
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Affiliation(s)
- Vishakha Rai
- Department of Chemistry
- Mangalore University
- Mangalore
- India
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6
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Rai V, Sorabad GS, Maddani MR. Transition metal free, green and facile halogenation of ketene dithioacetals using a KX–oxidant system. NEW J CHEM 2021. [DOI: 10.1039/d0nj03737k] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A facile oxidative halogenation of α-oxo ketene dithioacetals is achieved by using a potassium halide and an oxidant combination under transition metal free conditions at ambient temperature.
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Affiliation(s)
- Vishakha Rai
- Department of Chemistry
- Mangalore University
- 574199 Mangalore
- India
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7
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China H, Kumar R, Kikushima K, Dohi T. Halogen-Induced Controllable Cyclizations as Diverse Heterocycle Synthetic Strategy. Molecules 2020; 25:molecules25246007. [PMID: 33353126 PMCID: PMC7765919 DOI: 10.3390/molecules25246007] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2020] [Revised: 12/14/2020] [Accepted: 12/14/2020] [Indexed: 11/24/2022] Open
Abstract
In organic synthesis, due to their high electrophilicity and leaving group properties, halogens play pivotal roles in the activation and structural derivations of organic compounds. Recently, cyclizations induced by halogen groups that allow the production of diverse targets and the structural reorganization of organic molecules have attracted significant attention from synthetic chemists. Electrophilic halogen atoms activate unsaturated and saturated hydrocarbon moieties by generating halonium intermediates, followed by the attack of carbon-containing, nitrogen-containing, oxygen-containing, and sulfur-containing nucleophiles to give highly functionalized carbocycles and heterocycles. New transformations of halogenated organic molecules that can control the formation and stereoselectivity of the products, according to the difference in the size and number of halogen atoms, have recently been discovered. These unique cyclizations may possibly be used as efficient synthetic strategies with future advances. In this review, innovative reactions controlled by halogen groups are discussed as a new concept in the field of organic synthesis.
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Affiliation(s)
- Hideyasu China
- Department of Medical Bioscience, Nagahama Institute of Bio-Science and Technology, 1266, Tamuracho Nagahama-shi, Shiga 526-0829, Japan
- Correspondence: (H.C.); (T.D.)
| | - Ravi Kumar
- Department of Chemistry, J. C. Bose University of Science & Technology, YMCA, NH-2, Sector-6, Mathura Road, Faridabad, Haryana 121006, India;
| | - Kotaro Kikushima
- College of Pharmaceutical Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-0058, Japan;
| | - Toshifumi Dohi
- College of Pharmaceutical Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-0058, Japan;
- Correspondence: (H.C.); (T.D.)
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8
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Nishiguchi Y, Tomizuka A, Moriyama K. Formal Ring Contraction of Cyclic
N
‐Sulfonamides via C−N Bond Cleavage and α‐Amination by Oxidation of Halides. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202001034] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Yuna Nishiguchi
- Department of Chemistry Graduate School of Science and Soft Molecular Activation Research Center Chiba University 1-33 Yayoi-cho, Inage-ku Chiba 263-8522 Japan
| | - Akihiko Tomizuka
- Department of Chemistry Graduate School of Science and Soft Molecular Activation Research Center Chiba University 1-33 Yayoi-cho, Inage-ku Chiba 263-8522 Japan
| | - Katsuhiko Moriyama
- Department of Chemistry Graduate School of Science and Soft Molecular Activation Research Center Chiba University 1-33 Yayoi-cho, Inage-ku Chiba 263-8522 Japan
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9
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New syntheses of haloketo acid methyl esters and their transformation to halolactones by reductive cyclization. Russ Chem Bull 2020. [DOI: 10.1007/s11172-020-2965-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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10
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Li L, Li Y, Zhao Z, Luo H, Ma YN. Facial Syntheses of Bromobenzothiazines via Catalyst-Free Tandem C–H Amination/Bromination in Water. Org Lett 2019; 21:5995-5999. [DOI: 10.1021/acs.orglett.9b02131] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Lixin Li
- College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang, Henan 464000, China
| | - Yong Li
- College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang, Henan 464000, China
| | - Zhengguang Zhao
- College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang, Henan 464000, China
| | - Haotian Luo
- College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang, Henan 464000, China
| | - Yan-Na Ma
- College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, Henan 450001, China
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11
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Tan MA, Takayama H. Recent Progress in the Chemistry of Pandanus Alkaloids. THE ALKALOIDS: CHEMISTRY AND BIOLOGY 2019; 82:1-28. [DOI: 10.1016/bs.alkal.2018.12.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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12
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Yue Q, Yao Y, Luo L, Hu T, Shen L. Activation of peroxymonosulfate by surfactants as the metal-free catalysts for organic contaminant removal. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:26069-26078. [PMID: 28942535 DOI: 10.1007/s11356-017-0210-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2017] [Accepted: 09/13/2017] [Indexed: 06/07/2023]
Abstract
The present work described that tertiary ammonium surfactants containing bromide ion as novel metal-free catalysts were innovatively coupled with peroxymonosulfate (PMS) to build a simple catalytic oxidation system, possessing outstanding catalytic ability with organic dye Reactive Red M-3BE (RR M-3BE) as the target pollutant. Furthermore, cetyltrimethylammonium bromide (CTAB), a representative of cationic surfactant, was selected to further investigate the catalytic oxidation performance. It is found that at the critical micelle concentration (CMC) of CTAB, the oxidation efficiency of the CTAB/PMS system was optimal due to the strong electrostatic attraction between the CTA+ micelle and reactive anions (Br- and HSO5-), concentrating HSO5- and Br- at the micellar surface, which accelerated the catalytic oxidation reaction between Br- and HSO5-, generating a mass of highly active reactive species. A hybrid method that combined radical scavenger (methanol) with electron paramagnetic resonance (EPR) technology was adopted for the investigation of reactive species, and the results indicated that hydroxyl radical (•OH) was generated and had a major role in the process. The findings from this work provide a practicable pathway for highly efficient PMS activation in wastewater treatment, and also initiate a promising research area of surfactants in the field of environmental catalysis.
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Affiliation(s)
- Qing Yue
- National Engineering Lab of Textile Fiber Materials & Processing Technology, Zhejiang Sci-Tech University, Hangzhou, 310018, People's Republic of China
| | - Yuyuan Yao
- National Engineering Lab of Textile Fiber Materials & Processing Technology, Zhejiang Sci-Tech University, Hangzhou, 310018, People's Republic of China.
| | - Lianshun Luo
- National Engineering Lab of Textile Fiber Materials & Processing Technology, Zhejiang Sci-Tech University, Hangzhou, 310018, People's Republic of China
| | - Tao Hu
- National Engineering Lab of Textile Fiber Materials & Processing Technology, Zhejiang Sci-Tech University, Hangzhou, 310018, People's Republic of China
| | - Liang Shen
- National Engineering Lab of Textile Fiber Materials & Processing Technology, Zhejiang Sci-Tech University, Hangzhou, 310018, People's Republic of China
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13
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Kumar Y, Jaiswal Y, Shaw M, Kumar A. Metal-Free Catalyst-Controlled Chemoselective Synthesis of Aryl α
-Ketoesters and Primary α
-Ketoamides from Aryl Acetimidates. ChemistrySelect 2017. [DOI: 10.1002/slct.201701322] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Yogesh Kumar
- Department of Chemistry; Indian Institute of Technology Patna, Bihta; 801103 Bihar India
| | - Yogesh Jaiswal
- Department of Chemistry; Indian Institute of Technology Patna, Bihta; 801103 Bihar India
| | - Mukta Shaw
- Department of Chemistry; Indian Institute of Technology Patna, Bihta; 801103 Bihar India
| | - Amit Kumar
- Department of Chemistry; Indian Institute of Technology Patna, Bihta; 801103 Bihar India
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14
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Wu Y, Liu MJ, Huang HQ, Huang GX, Xiong FJ, Chen FE. Asymmetric Synthesis of Atorvastatin Calcium through Intramolecular Oxidative Oxygen-Nucleophilic Bromocyclization. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700387] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Yan Wu
- Engineering Center of Catalysis and Synthesis for Chiral Molecules; Department of Chemistry; Fudan University; 200433 Shanghai P. R. China
| | - Min-Jie Liu
- Engineering Center of Catalysis and Synthesis for Chiral Molecules; Department of Chemistry; Fudan University; 200433 Shanghai P. R. China
| | - Hai-Qing Huang
- Engineering Center of Catalysis and Synthesis for Chiral Molecules; Department of Chemistry; Fudan University; 200433 Shanghai P. R. China
| | - Guan-Xin Huang
- Engineering Center of Catalysis and Synthesis for Chiral Molecules; Department of Chemistry; Fudan University; 200433 Shanghai P. R. China
| | - Fang-Jun Xiong
- Engineering Center of Catalysis and Synthesis for Chiral Molecules; Department of Chemistry; Fudan University; 200433 Shanghai P. R. China
| | - Fen-Er Chen
- Engineering Center of Catalysis and Synthesis for Chiral Molecules; Department of Chemistry; Fudan University; 200433 Shanghai P. R. China
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15
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Saito A, Kumagai N, Shibasaki M. Cu/Pd Synergistic Dual Catalysis: Asymmetric α‐Allylation of an α‐CF
3
Amide. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201702113] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Akira Saito
- Institute of Microbial Chemistry (BIKAKEN) Tokyo 3-14-23 Kamiosaki, Shinagawa-ku Tokyo 141-0021 Japan
| | - Naoya Kumagai
- Institute of Microbial Chemistry (BIKAKEN) Tokyo 3-14-23 Kamiosaki, Shinagawa-ku Tokyo 141-0021 Japan
| | - Masakatsu Shibasaki
- Institute of Microbial Chemistry (BIKAKEN) Tokyo 3-14-23 Kamiosaki, Shinagawa-ku Tokyo 141-0021 Japan
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16
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Saito A, Kumagai N, Shibasaki M. Cu/Pd Synergistic Dual Catalysis: Asymmetric α‐Allylation of an α‐CF
3
Amide. Angew Chem Int Ed Engl 2017; 56:5551-5555. [DOI: 10.1002/anie.201702113] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Revised: 03/24/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Akira Saito
- Institute of Microbial Chemistry (BIKAKEN) Tokyo 3-14-23 Kamiosaki, Shinagawa-ku Tokyo 141-0021 Japan
| | - Naoya Kumagai
- Institute of Microbial Chemistry (BIKAKEN) Tokyo 3-14-23 Kamiosaki, Shinagawa-ku Tokyo 141-0021 Japan
| | - Masakatsu Shibasaki
- Institute of Microbial Chemistry (BIKAKEN) Tokyo 3-14-23 Kamiosaki, Shinagawa-ku Tokyo 141-0021 Japan
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17
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Kise N, Hamada Y, Sakurai T. Electroreductive coupling of aromatic ketones, aldehydes, and aldimines with α,β-unsaturated esters: Synthesis of 5-aryl substituted γ-butyrolactones and lactams. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.01.013] [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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18
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Moriyama K, Hamada T, Nakamura Y, Togo H. Catalytic dehydrogenative dual functionalization of ethers: dealkylation–oxidation–bromination accompanied by C–O bond cleavage via aerobic oxidation of bromide. Chem Commun (Camb) 2017; 53:6565-6568. [DOI: 10.1039/c7cc02166f] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Catalytic dehydrogenative dual functionalization (DDF) of ethers via oxidation, dealkylation, and α-bromination by the aerobic oxidation of bromide was developed to obtain the corresponding α-bromo ketones in high yields.
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Affiliation(s)
- Katsuhiko Moriyama
- Department of Chemistry
- Graduate School of Science
- Chiba University
- Chiba 263-8522
- Japan
| | - Tsukasa Hamada
- Department of Chemistry
- Graduate School of Science
- Chiba University
- Chiba 263-8522
- Japan
| | - Yu Nakamura
- Department of Chemistry
- Graduate School of Science
- Chiba University
- Chiba 263-8522
- Japan
| | - Hideo Togo
- Department of Chemistry
- Graduate School of Science
- Chiba University
- Chiba 263-8522
- Japan
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19
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Moriyama K, Nishinohara C, Togo H. Magnesium Lewis Acid Assisted Oxidative Bromoetherification Involving Bromine Transfer from Alkyl Bromides with Aldehydes by Umpolung of Bromide. Chemistry 2016; 22:11934-9. [PMID: 27304660 DOI: 10.1002/chem.201602055] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2016] [Indexed: 11/11/2022]
Abstract
An oxidative bromoetherification involving a bromine transfer from alkyl bromides upon reacting them with aldehydes in a Grignard reaction with a concurrent oxidation of bromide was developed to provide substituted tetrahydrofurans in high yields. This reaction, which proceeds through two types of bromine transfer, was promoted by the addition of a Brønsted acid. Mechanistic studies suggested that a magnesium Lewis acid activates hypobromate, which is generated in situ from the reaction of bromide and Oxone to improve the electrophilicity of the bromonium ion (Br(+) ) for the oxidative bromoetherification of alkenyl alcohols. Furthermore, the magnesium Lewis acid catalyzed oxidative bromoetherification of an alkenyl alcohol proceeded to provide a cyclization product in 92 % yield.
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Affiliation(s)
- Katsuhiko Moriyama
- Department of Chemistry, Graduate School of Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba, 263-8522, Japan. .,Molecular Chirality Research Center, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba, 263-8522, Japan.
| | - Chihiro Nishinohara
- Department of Chemistry, Graduate School of Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba, 263-8522, Japan
| | - Hideo Togo
- Department of Chemistry, Graduate School of Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba, 263-8522, Japan.
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20
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Meninno S, Volpe C, Lattanzi A. One-Pot Quinine-Catalyzed Synthesis of α-Chiral γ-Keto Esters: Enantioenriched Precursors of cis
-α,γ-Substituted-γ-Butyrolactones. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201600427] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Sara Meninno
- Dipartimento di Chimica e Biologia “A. Zambelli”; Università di Salerno; Via Giovanni Paolo II 84084 Fisciano Italy
| | - Chiara Volpe
- Dipartimento di Chimica e Biologia “A. Zambelli”; Università di Salerno; Via Giovanni Paolo II 84084 Fisciano Italy
| | - Alessandra Lattanzi
- Dipartimento di Chimica e Biologia “A. Zambelli”; Università di Salerno; Via Giovanni Paolo II 84084 Fisciano Italy
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21
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Bellér G, Szabó M, Lente G, Fábián I. Formation of 1,10-Phenanthroline-N,N'-dioxide under Mild Conditions: The Kinetics and Mechanism of the Oxidation of 1,10-Phenanthroline by Peroxomonosulfate Ion (Oxone). J Org Chem 2016; 81:5345-53. [PMID: 27227435 DOI: 10.1021/acs.joc.6b00641] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This paper confirms the unexpected formation of 1,10-phenanthroline-N,N'-dioxide (phenO2) when 1,10-phenanthroline (phen) is oxidized by peroxomonosulfate ion (PMS) in a neutral aqueous solution. The kinetics of oxidation of phen by PMS features a complex pH dependence. In 1.00 M H2SO4, 1,10-phenanthroline-mono-N-oxide (phenO) is the sole product of the reaction. The rate of the N-oxidation is highly dependent on pH with a maximum at pH ∼6.7. The formation of phenO occurs via two parallel pathways: the rate constant of the oxidation of phen (k = 3.1 ± 0.1 M(-1) s(-1)) is significantly larger than that of Hphen(+) [k = (4.1 ± 0.3) × 10(-3) M(-1) s(-1)] because the two N atoms are open to oxidative attack in the deprotonated substrate while an internal hydrogen bond hinders the oxidation of the protonated form. With an excess of PMS, four consecutive oxidation steps were found in nearly neutral solutions. In the early stage of the reaction, the stepwise oxidation results in the formation of phenO, which is converted into phenO2 in the second step. The formation of phenO2 was confirmed by (1)H NMR and ESI-MS methods. The results presented here offer the possibility of designing an experimental protocol for preparing phenO2.
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Affiliation(s)
- Gábor Bellér
- MTA-DE Homogeneous Catalysis and Reaction Mechanisms Research Group, University of Debrecen , H-4032 Debrecen, Egyetem tér 1, Hungary
| | - Mária Szabó
- MTA-DE Homogeneous Catalysis and Reaction Mechanisms Research Group, University of Debrecen , H-4032 Debrecen, Egyetem tér 1, Hungary
| | - Gábor Lente
- Department of Inorganic and Analytical Chemistry, University of Debrecen , H-4032 Debrecen, Egyetem tér 1, Hungary
| | - István Fábián
- Department of Inorganic and Analytical Chemistry, University of Debrecen , H-4032 Debrecen, Egyetem tér 1, Hungary
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22
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Li Z, Tong R. Catalytic Environmentally Friendly Protocol for Achmatowicz Rearrangement. J Org Chem 2016; 81:4847-55. [DOI: 10.1021/acs.joc.6b00469] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Zhilong Li
- Department of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay, Kowloon, Hong Kong, China
| | - Rongbiao Tong
- Department of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay, Kowloon, Hong Kong, China
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23
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Tan D, Xu M, Xu Z, Wu Y, You J. Several Enantiopure Chiral Building Blocks Derived fromD-Mannose and a Formal Synthesis of Dubiusamine C. CHINESE J CHEM 2016. [DOI: 10.1002/cjoc.201600050] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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24
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Moriyama K, Nishinohara C, Sugiue T, Togo H. Oxidative oxygen-nucleophilic bromo-cyclization of alkenyl carbonyl compounds without organic wastes using alkali metal reagents in green solvent. RSC Adv 2015. [DOI: 10.1039/c5ra19851h] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
A bromo-lactonization of alkenyl carboxylic acids and a bromo-cyclization ofN-allyl amides as oxygen-nucleophilic bromo-cyclization reactions were developedviathe oxidative umpolung of bromide using alkali metal bromide and inorganic oxidant.
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Affiliation(s)
- Katsuhiko Moriyama
- Department of Chemistry
- Graduate School of Science
- Chiba University
- Chiba 263-8522
- Japan
| | - Chihiro Nishinohara
- Department of Chemistry
- Graduate School of Science
- Chiba University
- Chiba 263-8522
- Japan
| | - Toru Sugiue
- Department of Chemistry
- Graduate School of Science
- Chiba University
- Chiba 263-8522
- Japan
| | - Hideo Togo
- Department of Chemistry
- Graduate School of Science
- Chiba University
- Chiba 263-8522
- Japan
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