1
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Jiang DB, Wu FY, Cui HL. Recent progress in the oxidative bromination of arenes and heteroarenes. Org Biomol Chem 2023; 21:1571-1590. [PMID: 36723168 DOI: 10.1039/d3ob00019b] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Oxidative bromination has been serving as a powerful tool for the synthesis of bromo-containing molecules, as this bromination strategy features environmental friendliness, high flexibility in reaction system design and wide abundance of bromide sources and oxidants. The past decade has witnessed a large number of efficient oxidative bromination reaction systems and novel brominated aromatics. This review summarizes recent developments in the field of oxidative preparation of bromoarenes and bromoheteroarenes covering from 2012 to 2022.
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Affiliation(s)
- Da-Bo Jiang
- Chongqing University of Arts and Sciences, 319 Honghe Ave., Yongchuan, Chongqing, 402160, PR China. .,State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, PR China
| | - Fei-Yue Wu
- Chongqing University of Arts and Sciences, 319 Honghe Ave., Yongchuan, Chongqing, 402160, PR China.
| | - Hai-Lei Cui
- Chongqing University of Arts and Sciences, 319 Honghe Ave., Yongchuan, Chongqing, 402160, PR China.
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2
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Karmaker R, Longkumer N, Richa K, Sinha D, Sinha UB. A computational approach to understanding the mechanism of aromatic bromination using quaternary ammonium tribromides. J INDIAN CHEM SOC 2022. [DOI: 10.1016/j.jics.2022.100574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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3
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Cochereau B, Meslet-Cladière L, Pouchus YF, Grovel O, Roullier C. Halogenation in Fungi: What Do We Know and What Remains to Be Discovered? Molecules 2022; 27:3157. [PMID: 35630634 PMCID: PMC9144378 DOI: 10.3390/molecules27103157] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Revised: 05/09/2022] [Accepted: 05/10/2022] [Indexed: 02/04/2023] Open
Abstract
In nature, living organisms produce a wide variety of specialized metabolites to perform many biological functions. Among these specialized metabolites, some carry halogen atoms on their structure, which can modify their chemical characteristics. Research into this type of molecule has focused on how organisms incorporate these atoms into specialized metabolites. Several families of enzymes have been described gathering metalloenzymes, flavoproteins, or S-adenosyl-L-methionine (SAM) enzymes that can incorporate these atoms into different types of chemical structures. However, even though the first halogenation enzyme was discovered in a fungus, this clade is still lagging behind other clades such as bacteria, where many enzymes have been discovered. This review will therefore focus on all halogenation enzymes that have been described in fungi and their associated metabolites by searching for proteins available in databases, but also by using all the available fungal genomes. In the second part of the review, the chemical diversity of halogenated molecules found in fungi will be discussed. This will allow the highlighting of halogenation mechanisms that are still unknown today, therefore, highlighting potentially new unknown halogenation enzymes.
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Affiliation(s)
- Bastien Cochereau
- Institut des Substances et Organismes de la Mer, ISOMer, UR 2160, Nantes Université, F-44000 Nantes, France; (B.C.); (Y.F.P.); (O.G.)
- Laboratoire Universitaire de Biodiversité et Écologie Microbienne, INRAE, University Brest, F-29280 Plouzané, France;
| | - Laurence Meslet-Cladière
- Laboratoire Universitaire de Biodiversité et Écologie Microbienne, INRAE, University Brest, F-29280 Plouzané, France;
| | - Yves François Pouchus
- Institut des Substances et Organismes de la Mer, ISOMer, UR 2160, Nantes Université, F-44000 Nantes, France; (B.C.); (Y.F.P.); (O.G.)
| | - Olivier Grovel
- Institut des Substances et Organismes de la Mer, ISOMer, UR 2160, Nantes Université, F-44000 Nantes, France; (B.C.); (Y.F.P.); (O.G.)
| | - Catherine Roullier
- Institut des Substances et Organismes de la Mer, ISOMer, UR 2160, Nantes Université, F-44000 Nantes, France; (B.C.); (Y.F.P.); (O.G.)
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4
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Ma X, Zhu Y, Yu J, Zhao G, Duanmu J, Yuan Y, Chang XP, Xu D, Zhou Q. Unprecedented observation and characterization of sulfur-centred bifurcated hydrogen bonds. Phys Chem Chem Phys 2021; 23:26519-26523. [PMID: 34807205 DOI: 10.1039/d1cp04601b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Owing to the small electronegativity of the sulfur atom, it is commonly supposed that at most one weak H-bond can be formed between a sulfur atom and an H-bond donor. In this paper, an unprecedented 2 : 1 binding species generated from two molecules of phenol and a molecule of thioether was observed and characterized by various nuclear magnetic resonance (NMR) techniques, Fourier transform-infrared (FT-IR) techniques and density functional theory (DFT) calculations, revealing the formation of sulfur-centred O-H⋯S⋯H-O bifurcated H-bonds. This work may provide a simple and efficient method for the quantitative analysis of weak H-bonds between small organic molecules.
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Affiliation(s)
- Xiantao Ma
- College of Chemistry and Chemical Engineering, Green Catalysis & Synthesis Key Laboratory of Xinyang City, Xinyang Normal University, Xinyang, Henan 464000, China.
| | - Yingying Zhu
- College of Chemistry and Chemical Engineering, Green Catalysis & Synthesis Key Laboratory of Xinyang City, Xinyang Normal University, Xinyang, Henan 464000, China.
| | - Jing Yu
- College of Chemistry and Chemical Engineering, Green Catalysis & Synthesis Key Laboratory of Xinyang City, Xinyang Normal University, Xinyang, Henan 464000, China.
| | - Geng Zhao
- College of Chemistry and Chemical Engineering, Green Catalysis & Synthesis Key Laboratory of Xinyang City, Xinyang Normal University, Xinyang, Henan 464000, China.
| | - Jiaxin Duanmu
- College of Chemistry and Chemical Engineering, Green Catalysis & Synthesis Key Laboratory of Xinyang City, Xinyang Normal University, Xinyang, Henan 464000, China.
| | - Yiyun Yuan
- College of Chemistry and Chemical Engineering, Green Catalysis & Synthesis Key Laboratory of Xinyang City, Xinyang Normal University, Xinyang, Henan 464000, China.
| | - Xue-Ping Chang
- College of Chemistry and Chemical Engineering, Green Catalysis & Synthesis Key Laboratory of Xinyang City, Xinyang Normal University, Xinyang, Henan 464000, China.
| | - Dongli Xu
- College of Chemistry and Chemical Engineering, Green Catalysis & Synthesis Key Laboratory of Xinyang City, Xinyang Normal University, Xinyang, Henan 464000, China.
| | - Qiuju Zhou
- College of Chemistry and Chemical Engineering, Green Catalysis & Synthesis Key Laboratory of Xinyang City, Xinyang Normal University, Xinyang, Henan 464000, China.
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5
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Bauer JO, Koschabek S, Falk A. Interplay of Hydrogen and Halogen Bonding in the Crystal Structures of 2,6‐Dihalogenated Phenols. ChemistrySelect 2021. [DOI: 10.1002/slct.202101723] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Jonathan O. Bauer
- Institut für Anorganische Chemie, Fakultät für Chemie und Pharmazie Universität Regensburg Universitätsstraße 31 D-93053 Regensburg Germany
| | - Sarah Koschabek
- Institut für Anorganische Chemie, Fakultät für Chemie und Pharmazie Universität Regensburg Universitätsstraße 31 D-93053 Regensburg Germany
| | - Alexander Falk
- Institut für Anorganische Chemie, Fakultät für Chemie und Pharmazie Universität Regensburg Universitätsstraße 31 D-93053 Regensburg Germany
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6
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Abstract
C-X (X = halogen) bonds are indispensable functional groups in organic synthesis
by mediating a massive number of important organic reactions. While a variety of different
catalytic strategies are available for generating C-X bonds, those methods enabling the C-X
bond formation under transition metal-free conditions via the C-H bond functionalization are
particularly interesting because of the inherent atom economy and environmental friendliness
associated with such methods. Herein, the advancements in the transition metal-free halogenation
of C(2)-H bond are reviewed.
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Affiliation(s)
- Tian Luo
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| | - Shanghui Tian
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| | - Jie-Ping Wan
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| | - Yunyun Liu
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
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7
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Ourhzif EM, Pâris A, Abrunhosa-Thomas I, Ketatni EM, Chalard P, Khouili M, Daniellou R, Troin Y, Akssira M. Design, synthesis, and evaluation of cytotoxic activities of arylnaphthalene lignans and aza-analogs. Arch Pharm (Weinheim) 2021; 354:e2000479. [PMID: 33586249 DOI: 10.1002/ardp.202000479] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Revised: 01/11/2021] [Accepted: 01/15/2021] [Indexed: 11/10/2022]
Abstract
A concise and versatile synthetic strategy for the total synthesis of arylnaphthalene lignans and aza-analogs was developed. The main objective was to develop synthetic tactics for the creation of the lactone and lactam unit that would give access to an array of synthetic, natural, and/or bioactive compounds through rather simple chemical manipulation. The flexibility and potentiality of these new processes were further illustrated by the total synthesis of retrojusticidin B (13b), justicidin C (14b), and methoxy-vitedoamine A (22a). In this study, a series of novel aryl-naphthalene lignans and aza-analogs were synthesized, and the cytotoxic activities of all compounds on cancer cell growth were evaluated. The target compounds were structurally characterized by 1 H NMR (nuclear magnetic resonance), 13 C NMR, infrared, high-resolution mass spectrometry, and X-ray crystallography. The IC50 values of these compounds on five tumor cell lines (A549, HS683, MCF-7, SK-MEL-28, and B16-F1) were obtained by MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) colorimetric assay. Five of the compounds exhibited excellent activity compared to 5-fluorouracil and etoposide against the five cell lines tested, with IC50 values ranging from 1 to 10 μM.
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Affiliation(s)
- El-Mahdi Ourhzif
- SIGMA Clermont, ICCF, Université Clermont Auvergne, CNRS, Clermont-Ferrand, France.,Laboratoire de Chimie Physique et Chimie Bioorganique, FST, Université Hassan II Casablanca, Mohammedia, Morocco
| | - Arnaud Pâris
- Institut de Chimie Organique et Analytique (ICOA), Université d'Orléans/CNRS, UMR 7311, Orléans, France
| | | | - El Mostafa Ketatni
- Laboratoire de Chimie Organique et Analytique, FST, Université Sultan Moulay Slimane, Beni-Mellal, Morocco
| | - Pierre Chalard
- SIGMA Clermont, ICCF, Université Clermont Auvergne, CNRS, Clermont-Ferrand, France
| | - Mostafa Khouili
- Laboratoire de Chimie Organique et Analytique, FST, Université Sultan Moulay Slimane, Beni-Mellal, Morocco
| | - Richard Daniellou
- Institut de Chimie Organique et Analytique (ICOA), Université d'Orléans/CNRS, UMR 7311, Orléans, France
| | - Yves Troin
- SIGMA Clermont, ICCF, Université Clermont Auvergne, CNRS, Clermont-Ferrand, France
| | - Mohamed Akssira
- Laboratoire de Chimie Physique et Chimie Bioorganique, FST, Université Hassan II Casablanca, Mohammedia, Morocco
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8
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Yang Y, Gao X, Zeng X, Han J, Xu B. Hydrogen-Bond-Donor Solvents Enable Catalyst-Free (Radio)-Halogenation and Deuteration of Organoborons. Chemistry 2020; 27:1297-1300. [PMID: 32966636 DOI: 10.1002/chem.202003919] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 09/17/2020] [Indexed: 12/25/2022]
Abstract
A hydrogen bond donor solvent assisted (radio)halogenation and deuteration of organoborons has been developed. The reactions exhibited high functional group tolerance and needed only an ambient atmosphere. Most importantly, compared to literature methods, our conditions are more consistent with the principals of green chemistry (e.g., metal-free, strong oxidant-free, more straightforward conditions).
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Affiliation(s)
- Yi Yang
- Key Laboratory of Science and Technology of Eco-Textiles, Ministry of Education, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai, 201620, P. R. China
| | - Xinyan Gao
- Institute of Radiation Medicine, Fudan University, 2094 Xietu Road, Shanghai, P. R. China
| | - Xiaojun Zeng
- Key Laboratory of Science and Technology of Eco-Textiles, Ministry of Education, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai, 201620, P. R. China
| | - Junbin Han
- Institute of Radiation Medicine, Fudan University, 2094 Xietu Road, Shanghai, P. R. China
| | - Bo Xu
- Key Laboratory of Science and Technology of Eco-Textiles, Ministry of Education, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai, 201620, P. R. China
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9
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Yu J, Chang X, Ma R, Zhou Q, Wei M, Cao X, Ma X. Water‐Promoted Dehydrative Tsuji–Trost Reaction of Non‐Derivatized Allylic Alcohols with Sulfinic Acids. European J Org Chem 2020. [DOI: 10.1002/ejoc.202001306] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Jing Yu
- College of Chemistry and Chemical Engineering Green Catalysis & Synthesis Key Laboratory of Xinyang City Xinyang Normal University 464000 Xinyang Henan China
| | - Xueping Chang
- College of Chemistry and Chemical Engineering Green Catalysis & Synthesis Key Laboratory of Xinyang City Xinyang Normal University 464000 Xinyang Henan China
| | - Ruitian Ma
- College of Chemistry and Chemical Engineering Green Catalysis & Synthesis Key Laboratory of Xinyang City Xinyang Normal University 464000 Xinyang Henan China
| | - Qiuju Zhou
- College of Chemistry and Chemical Engineering Green Catalysis & Synthesis Key Laboratory of Xinyang City Xinyang Normal University 464000 Xinyang Henan China
| | - Mengmeng Wei
- College of Chemistry and Chemical Engineering Green Catalysis & Synthesis Key Laboratory of Xinyang City Xinyang Normal University 464000 Xinyang Henan China
| | - Xinhua Cao
- College of Chemistry and Chemical Engineering Green Catalysis & Synthesis Key Laboratory of Xinyang City Xinyang Normal University 464000 Xinyang Henan China
| | - Xiantao Ma
- College of Chemistry and Chemical Engineering Green Catalysis & Synthesis Key Laboratory of Xinyang City Xinyang Normal University 464000 Xinyang Henan China
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10
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Acosta-Guzmán P, Mahecha-Mahecha C, Gamba-Sánchez D. Electrophilic Chlorine from Chlorosulfonium Salts: A Highly Chemoselective Reduction of Sulfoxides. Chemistry 2020; 26:10348-10354. [PMID: 32428263 DOI: 10.1002/chem.202001815] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Revised: 05/10/2020] [Indexed: 12/18/2022]
Abstract
Herein, we describe a selective late-stage deoxygenation of sulfoxides based on a novel application of chlorosulfonium salts and demonstrate a new process using these species generated in situ from sulfoxides as the source of electrophilic chlorine. The use of highly nucleophilic 1,3,5-trimethoxybenzene (TMB) as the reducing agent is described for the first time and applied in the deoxygenation of simple and functionalized sulfoxides. The method is easy to handle, economic, suitable for gram-scale operations, and readily applied for poly-functionalized molecules, as demonstrated with more than 45 examples, including commercial medicines and analogues. We also report the results of competition experiments that define the more reactive sulfoxide and we present a mechanistic proposal based on substrate and product observations.
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Affiliation(s)
- Paola Acosta-Guzmán
- Laboratory of Organic Synthesis, Bio and Organocatalysis, Chemistry Department, Universidad de los Andes, Cra 1 No. 18A-12 Q:305, Bogota, 111711, Colombia
| | - Camilo Mahecha-Mahecha
- Laboratory of Organic Synthesis, Bio and Organocatalysis, Chemistry Department, Universidad de los Andes, Cra 1 No. 18A-12 Q:305, Bogota, 111711, Colombia
| | - Diego Gamba-Sánchez
- Laboratory of Organic Synthesis, Bio and Organocatalysis, Chemistry Department, Universidad de los Andes, Cra 1 No. 18A-12 Q:305, Bogota, 111711, Colombia
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11
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Vatandoust Namanloo A, Akhlaghinia B, Mohammadinezhad A. Magnetically recoverable ferromagnetic 3D hierarchical core-shell Fe3O4@NiO/Co3O4 microspheres as an efficient and ligand-free catalyst for C–S bond formation in poly (ethylene glycol). J Sulphur Chem 2020. [DOI: 10.1080/17415993.2020.1753743] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
| | - Batool Akhlaghinia
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Arezou Mohammadinezhad
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
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12
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Wang L, Feng C, Zhang Y, Hu J. Regioselective Monobromination of Phenols with KBr and ZnAl-BrO 3--Layered Double Hydroxides. Molecules 2020; 25:E914. [PMID: 32085603 PMCID: PMC7070364 DOI: 10.3390/molecules25040914] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2020] [Revised: 02/15/2020] [Accepted: 02/16/2020] [Indexed: 11/19/2022] Open
Abstract
The regioselective mono-bromination of phenols has been successfully developed with KBr and ZnAl-BrO3--layered double hydroxides (abbreviated as ZnAl-BrO3--LDHs) as brominating reagents. The para site is much favorable and the ortho site takes the priority if para site is occupied. This reaction featured with excellent regioselectivity, cheap brominating reagents, mild reaction condition, high atom economy, broad substrate scope, and provided an efficient method to synthesize bromophenols.
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Affiliation(s)
- Ligeng Wang
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310004, China; (C.F.); (Y.Z.)
| | | | | | - Jun Hu
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310004, China; (C.F.); (Y.Z.)
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13
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Motati DR, Uredi D, Burra AG, Bowen JP, Fronczek FR, Smith CR, Watkins EB. Differential formation of nitrogen-centered radicals leading to unprecedented, regioselective bromination of N,N′-(1,2-phenylene)bisamides and 2-amidophenols. Org Chem Front 2020. [DOI: 10.1039/c9qo01508f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
A highly efficient, site-selective, visible light-accelerated, remote C–H halogenation of unsymmetrical aromatic bisamides/amidoesters has been developed.
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Affiliation(s)
- Damoder Reddy Motati
- Center for Pharmacometrics and Molecular Discovery
- Department of Pharmaceutical Sciences
- College of Pharmacy
- Union University
- Jackson
| | - Dilipkumar Uredi
- Center for Pharmacometrics and Molecular Discovery
- Department of Pharmaceutical Sciences
- College of Pharmacy
- Union University
- Jackson
| | - Amarender Goud Burra
- Center for Pharmacometrics and Molecular Discovery
- Department of Pharmaceutical Sciences
- College of Pharmacy
- Union University
- Jackson
| | - J. Phillip Bowen
- Department of Pharmaceutical Sciences
- College of Pharmacy
- Mercer University
- Atlanta
- USA
| | | | - Clint R. Smith
- Center for Pharmacometrics and Molecular Discovery
- Department of Pharmaceutical Sciences
- College of Pharmacy
- Union University
- Jackson
| | - E. Blake Watkins
- Center for Pharmacometrics and Molecular Discovery
- Department of Pharmaceutical Sciences
- College of Pharmacy
- Union University
- Jackson
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14
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Chen D, Li J, Cui P, Shan Y, Zhao Y, Qiu G. Tandem Oxidative Radical Halogenated Addition of Alkynyl Imines: Regioselective Synthesis of 3-Haloquinolines. European J Org Chem 2019. [DOI: 10.1002/ejoc.201901395] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Dianpeng Chen
- Chemistry and Chemical Engineering; Qufu Normal University; 273165 Qufu Shandong China
| | - Jianming Li
- Chemistry and Chemical Engineering; Qufu Normal University; 273165 Qufu Shandong China
| | - Peiying Cui
- Chemistry and Chemical Engineering; Qufu Normal University; 273165 Qufu Shandong China
| | - Yingying Shan
- Chemistry and Chemical Engineering; Qufu Normal University; 273165 Qufu Shandong China
| | - Yutong Zhao
- Chemistry and Chemical Engineering; Qufu Normal University; 273165 Qufu Shandong China
| | - Guanyinsheng Qiu
- College of Biological, Chemical Science and Engineering; Jiaxing University; 314001 Jiaxing Zhejiang China
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15
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Laina-Martín V, Pérez I, Fernández-Salas JA, Alemán J. Nucleophilic halo-Michael addition under Lewis-base activation. Chem Commun (Camb) 2019; 55:12936-12939. [PMID: 31599898 DOI: 10.1039/c9cc07068k] [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
A simple and general conjugate nucleophilic halogenation is presented. The THTO/halosilane combination has shown the ability to act as a nucleophilic halide source in the conjugate addition to a variety of Michael acceptors. In addition, a straightforward diastereoselective halogen installation using α,β-unsaturated acyloxazolidinones as platforms has been developed.
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Affiliation(s)
- Víctor Laina-Martín
- Organic Chemistry Department, Módulo 1, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
| | - Ignacio Pérez
- Organic Chemistry Department, Módulo 1, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
| | - Jose A Fernández-Salas
- Organic Chemistry Department, Módulo 1, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
| | - José Alemán
- Organic Chemistry Department, Módulo 1, Universidad Autónoma de Madrid, 28049 Madrid, Spain. and Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, 28049 Madrid, Spain
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16
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Acosta-Guzmán P, Rodríguez-López A, Gamba-Sánchez D. Pummerer Synthesis of Chromanes Reveals a Competition between Cyclization and Reductive Chlorination. Org Lett 2019; 21:6903-6908. [PMID: 31441312 DOI: 10.1021/acs.orglett.9b02520] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The competition between an unprecedented reductive chlorination and the Pummerer reaction was studied and applied to the synthesis of benzofused oxygen heterocycles including 3-aminochromanes and in the intramolecular chlorination of activated aromatic rings. The use of (COCl)2 as a Pummerer activator showed substantial activity, producing α-chlorinated sulfides that can undergo Pummerer-Friedel-Crafts cyclization. If the aromatic ring has electron-donating groups in position three, then the reaction follows a different pathway, yielding the reductive chlorination products, where the chlorine atom comes from a sulfonium salt.
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Affiliation(s)
- Paola Acosta-Guzmán
- Laboratory of Organic Synthesis, Bio and Organocatalysis, Chemistry Department, Universidad de los Andes, Cra 1 No. 18A-12 Q:305, Bogotá 111711, Colombia
| | - Alvaro Rodríguez-López
- Laboratory of Organic Synthesis, Bio and Organocatalysis, Chemistry Department, Universidad de los Andes, Cra 1 No. 18A-12 Q:305, Bogotá 111711, Colombia
| | - Diego Gamba-Sánchez
- Laboratory of Organic Synthesis, Bio and Organocatalysis, Chemistry Department, Universidad de los Andes, Cra 1 No. 18A-12 Q:305, Bogotá 111711, Colombia
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17
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Ma X, Zhou K, Ren M, Wang M, Yu J. Steric Hindrance Effect Leading to Regioselective Bromination of Phenols with HBr. CHINESE J ORG CHEM 2019. [DOI: 10.6023/cjoc201907038] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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