1
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Huynh NO, Hodík T, Krische MJ. Enantioselective Transfer Hydrogenative Cycloaddition Unlocks the Total Synthesis of SF2446 B3: An Aglycone of Arenimycin and SF2446 Type II Polyketide Antibiotics. J Am Chem Soc 2023; 145:17461-17467. [PMID: 37494281 PMCID: PMC10443208 DOI: 10.1021/jacs.3c06225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/28/2023]
Abstract
The first total synthesis and structure validation of an arenimycin/SF2446 type II polyketide is described, as represented by de novo construction of SF2446 B3, the aglycone shared by this family of type II polyketides. Ruthenium-catalyzed α-ketol-benzocyclobutenone [4 + 2] cycloaddition, which occurs via successive stereoablation-stereoregeneration, affects a double dynamic kinetic asymmetric transformation wherein two racemic starting materials combine to form the congested angucycline bay region with control of regio-, diastereo-, and enantioselectivity. This work represents the first application of transfer hydrogenative cycloaddition and enantioselective intermolecular metal-catalyzed C-C bond activation in target-oriented synthesis.
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Affiliation(s)
- Nancy O Huynh
- Department of Chemistry, University of Texas at Austin, 105 E 24th Street, Austin, Texas 78712, United States
| | - Tomáš Hodík
- Department of Chemistry, University of Texas at Austin, 105 E 24th Street, Austin, Texas 78712, United States
| | - Michael J Krische
- Department of Chemistry, University of Texas at Austin, 105 E 24th Street, Austin, Texas 78712, United States
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2
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Kang S, Kim Y, Kim S, Ko JY, Kim JH. Short and scalable synthesis of cynandione A. Org Biomol Chem 2023; 21:1868-1871. [PMID: 36762547 DOI: 10.1039/d2ob02317b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Abstract
A two-step gram-scale synthesis of cynandione A is described. The key to success is the one-pot tandem oxidation/regioselective arylation of 1,4-hydroquinone in the presence of an excess amount of oxidant. Natural bond orbital charge analysis was performed in order to understand the regioselectivity of the arylation step. The highly practical and scalable synthesis developed herein is expected to assist the in-depth biological evaluation of cynandione A in various animal models.
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Affiliation(s)
- Seoungwoo Kang
- College of Pharmacy, Chung-Ang University, Seoul 06974, Republic of Korea.
| | - Yeonjoon Kim
- Chemistry Department, Colorado State University, Fort Collins, Colorado 80523, USA
| | - Seonah Kim
- Chemistry Department, Colorado State University, Fort Collins, Colorado 80523, USA
| | - Ju Young Ko
- College of Pharmacy, Chung-Ang University, Seoul 06974, Republic of Korea.
| | - Jae Hyun Kim
- College of Pharmacy, Chung-Ang University, Seoul 06974, Republic of Korea.
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3
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Dong Y, Chen Y, Zhang ZY, Qian JH, Peng ZZ, Chang B, Shi ZC, Li ZH, He B. A one-pot access to 2-(N-substituted Amino)-Quinones or 3-indolyl-Quinones from naphthol/hydroquinone. Tetrahedron 2023. [DOI: 10.1016/j.tet.2023.133337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/02/2023]
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4
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Jaithum K, Thongsornkleeb C, Tummatorn J, Ruchirawat S. Synergistic Lewis–Brønsted Acid Catalysis in Cascade Cyclization of ortho-Alkynylaryl Cyclopropylketones for the Synthesis of 2,3-Dihydronaphtho[1,2- b]furans. J Org Chem 2022; 87:15358-15379. [DOI: 10.1021/acs.joc.2c01940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kanokwan Jaithum
- Program on Chemical Sciences, Chulabhorn Graduate Institute, Center of Excellence on Environmental Health and Toxicology (EHT), OPS, MHESI, 54 Kamphaeng Phet 6, Laksi, Bangkok 10210, Thailand
| | - Charnsak Thongsornkleeb
- Program on Chemical Sciences, Chulabhorn Graduate Institute, Center of Excellence on Environmental Health and Toxicology (EHT), OPS, MHESI, 54 Kamphaeng Phet 6, Laksi, Bangkok 10210, Thailand
- Laboratory of Medicinal Chemistry, Chulabhorn Research Institute, 54 Kamphaeng Phet 6, Laksi, Bangkok 10210, Thailand
| | - Jumreang Tummatorn
- Program on Chemical Sciences, Chulabhorn Graduate Institute, Center of Excellence on Environmental Health and Toxicology (EHT), OPS, MHESI, 54 Kamphaeng Phet 6, Laksi, Bangkok 10210, Thailand
- Laboratory of Medicinal Chemistry, Chulabhorn Research Institute, 54 Kamphaeng Phet 6, Laksi, Bangkok 10210, Thailand
| | - Somsak Ruchirawat
- Program on Chemical Sciences, Chulabhorn Graduate Institute, Center of Excellence on Environmental Health and Toxicology (EHT), OPS, MHESI, 54 Kamphaeng Phet 6, Laksi, Bangkok 10210, Thailand
- Laboratory of Medicinal Chemistry, Chulabhorn Research Institute, 54 Kamphaeng Phet 6, Laksi, Bangkok 10210, Thailand
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5
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Dong Y, Xie C, Chen J, Shen A, Luo QQ, He B, Wang ZF, Chang B, Yang F, Shi ZC. Iron catalyzed C-C dehydrogenative coupling reaction: synthesis of arylquinones from quinones/hydroquinones. RSC Adv 2022; 12:3783-3787. [PMID: 35425366 PMCID: PMC8979275 DOI: 10.1039/d1ra08828a] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2021] [Accepted: 01/24/2022] [Indexed: 11/28/2022] Open
Abstract
An atom-economical approach for the synthesis of arylquinones was achieved successfully via direct oxidative C-C dehydrogenative coupling reaction of quinones/hydroquinones with electron-rich arenes using an inexpensive Fe-I2-(NH4)2S2O8 system. The efficiency of this catalytic approach was established with a broad scope of substrates involving quinones and hydroquinones to give high yields (60-89%) of several arylated quinones. The present protocol is simple, practical, and shows good functional group tolerance.
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Affiliation(s)
- Yu Dong
- College of Chemistry and Life Science, Sichuan Provincial Key Laboratory for Structural Optimization and Application of Functional Molecules, Chengdu Normal University Chengdu 611130 P. R. China
| | - Chun Xie
- College of Chemistry and Life Science, Sichuan Provincial Key Laboratory for Structural Optimization and Application of Functional Molecules, Chengdu Normal University Chengdu 611130 P. R. China
| | - Jia Chen
- College of Chemistry and Life Science, Sichuan Provincial Key Laboratory for Structural Optimization and Application of Functional Molecules, Chengdu Normal University Chengdu 611130 P. R. China
| | - Ai Shen
- College of Chemistry and Life Science, Sichuan Provincial Key Laboratory for Structural Optimization and Application of Functional Molecules, Chengdu Normal University Chengdu 611130 P. R. China
| | - Qi-Qi Luo
- College of Chemistry and Life Science, Sichuan Provincial Key Laboratory for Structural Optimization and Application of Functional Molecules, Chengdu Normal University Chengdu 611130 P. R. China
| | - Bing He
- College of Chemistry and Life Science, Sichuan Provincial Key Laboratory for Structural Optimization and Application of Functional Molecules, Chengdu Normal University Chengdu 611130 P. R. China
| | - Zhi-Fan Wang
- College of Chemistry and Life Science, Sichuan Provincial Key Laboratory for Structural Optimization and Application of Functional Molecules, Chengdu Normal University Chengdu 611130 P. R. China
| | - Bo Chang
- College of Chemistry and Life Science, Sichuan Provincial Key Laboratory for Structural Optimization and Application of Functional Molecules, Chengdu Normal University Chengdu 611130 P. R. China
| | - Fan Yang
- College of Chemistry and Life Science, Sichuan Provincial Key Laboratory for Structural Optimization and Application of Functional Molecules, Chengdu Normal University Chengdu 611130 P. R. China
| | - Zhi-Chuan Shi
- Southwest Minzu University Chengdu 610041 P. R. China
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6
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Zhang X, Yu W, Nie Y, Zhang Y, Gu X, Wei W, Zhang Z, Liang T. Copper-iodine Co-catalyzed C−H Aminoalkenylation of Indoles via Temperature-controlled Selectivity Switch: Facile Synthesis of 2-Azolyl-3-alkenylindoles. Org Chem Front 2022. [DOI: 10.1039/d2qo00627h] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient copper-iodine co-catalyzed 2,3-difunctionalization of indoles with azoles and phenols via temperature-controlled selectivity switch has been developed for the green synthesis of 2-azolyl-3-alkenylindoles. The strategy involves the simultaneous establishment...
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7
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Addition of Vindoline to p-Benzoquinone: Regiochemistry, Stereochemistry and Symmetry Considerations. Molecules 2021; 26:molecules26216395. [PMID: 34770804 PMCID: PMC8587549 DOI: 10.3390/molecules26216395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Revised: 10/18/2021] [Accepted: 10/20/2021] [Indexed: 11/17/2022] Open
Abstract
Vindoline and catharanthine are the major alkaloids of Catharanthus roseus and are extracted in large quantities to prepare the pharmaceutically important Vinca type alkaloids vincaleukoblastine, vincristine and navelbine. The higher yield of vindoline relative to catharanthine makes it an attractive substrate for developing new chemistry and adding value to the plant. In this context, we have reacted vindoline with a selection of electrophiles among which benzoquinone. Conditions were developed to optimize the synthesis of a mono-adduct, of five bis-adducts, and of tri-adducts and tetra-adducts, several of these adducts being mixtures of conformational isomers. Copper(II) was added to the reactions to promote reoxidation of the intermediate hydroquinones and simplify the reaction products. The structures were solved by spectroscopic means and by symmetry considerations. Among the bis-isomers, the 2,3-diadduct consists of three unseparable species, two major ones with an axis of symmetry, thus giving a single set of signals and existing as two different species with indistinguishable NMR spectra. The third and minor isomer has no symmetry and therefore exhibits nonequivalence in the signals of the two vindoline moieties. These isomers are designated as syn (minor) and anti (major) and there exists a high energy barrier between them making their interconversion difficult. DFT calculations on simplified model compounds demonstrate that the syn-anti interconversion is not possible at room temperature on the NMR chemical shift time scale. These molecules are not rigid and calculations showed a back-and-forth conrotatory motion of the two vindolines. This “windshield wiper” effect is responsible for the observation of exchange correlations in the NOESY spectra. The same phenomenon is observed with the higher molecular weight adducts, which are also mixtures of rotational isomers. The same lack of rotations between syn and anti isomers is responsible for the formation of four tri-adducts and of seven tetra-adducts. On a biological standpoint, the mono adduct displayed anti-inflammatory properties at the 5 μM level while the di-adducts and tri-adducts showed moderate cytotoxicity against Au565, and HeLa cancer cell lines.
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8
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Pal S, Chatterjee R, Santra S, Zyryanov GV, Majee A. Metal‐Free, PhI(OAc)
2
‐Promoted Oxidative C(
sp
2
)−H Difunctionalization: Synthesis of Thioaminated Naphthoquinones. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202100796] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Satyajit Pal
- Department of Chemistry Visva-Bharati (A Central University) Santiniketan 731235 India
| | - Rana Chatterjee
- Department of Chemistry Visva-Bharati (A Central University) Santiniketan 731235 India
| | - Sougata Santra
- Department of Organic and Biomolecular Chemistry, Chemical Engineering Institute Ural Federal University 19 Mira Street 620002 Yekaterinburg Russian Federation
| | - Grigory V. Zyryanov
- Department of Organic and Biomolecular Chemistry, Chemical Engineering Institute Ural Federal University 19 Mira Street 620002 Yekaterinburg Russian Federation
- I. Ya. Postovskiy Institute of Organic Synthesis Ural Division of the Russian Academy of Sciences 22 S. Kovalevskoy Street 620219 Yekaterinburg Russian Federation
| | - Adinath Majee
- Department of Chemistry Visva-Bharati (A Central University) Santiniketan 731235 India
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9
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Mokkarat A, Kruanetr S, Sakee U. Simple continuous flow synthesis of 3-indolyl naphthoquinone using acid catalysts. SYNTHETIC COMMUN 2021. [DOI: 10.1080/00397911.2021.1934701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
| | | | - Uthai Sakee
- Mahasarakham University, Mahasarakham, Thailand
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10
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Abstract
The straightforward oxidation of electron-rich arenes, namely, phenols, naphthols, and anisole derivatives, under mild reaction conditions, is described by means of the use of an environmentally benign HFIP-UHP system. The corresponding quinones or hydroxylated arenes were obtained in moderate to good yields.
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Affiliation(s)
- Natalia Llopis
- Departamento de Quı́mica Orgánica and Instituto de Sı́ntesis Orgánica (ISO), Facultad de Ciencias, Universidad de Alicante, Apdo. 99, Alicante E-03080, Spain
| | - Alejandro Baeza
- Departamento de Quı́mica Orgánica and Instituto de Sı́ntesis Orgánica (ISO), Facultad de Ciencias, Universidad de Alicante, Apdo. 99, Alicante E-03080, Spain
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11
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Dong Y, Zhang H, Yang J, He S, Shi ZC, Zhang XM, Wang JY. B(C 6F 5) 3-Catalyzed C-C Coupling of 1,4-Naphthoquinones with the C-3 Position of Indole Derivatives in Water. ACS OMEGA 2019; 4:21567-21577. [PMID: 31867553 PMCID: PMC6921613 DOI: 10.1021/acsomega.9b03328] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Accepted: 11/18/2019] [Indexed: 06/10/2023]
Abstract
An atom-economical and environmentally benign approach for the synthesis of indole-substituted 1,4-naphthoquinones from indoles and 1,4-naphthoquinones using readily available Lewis acidic B(C6F5)3 in water and with the recycling of water and part of the catalyst is reported. The reaction proceeded through the B(C6F5)3-catalyzed C(sp2)-H and C(sp2)-H bond coupling of 1,4-naphthoquinones with the C-3 position of indole derivatives in water. This methodology provides a facile protocol for the synthesis of some new indole-substituted 1,4-naphthoquinones in satisfactory yields and with a broad substrate scope. When compared to known methods for the synthesis of indole-substituted 1,4-naphthoquinones, this protocol is practical and efficient and does not require a transition-metal catalyst or toxic organic solvents. In addition, we utilized a simple filtration process for complete recycling of the solvent and the part of the catalyst in each reaction cycle.
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Affiliation(s)
- Yu Dong
- Chengdu
Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, P. R. China
- University
of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Hua Zhang
- Chengdu
Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, P. R. China
- University
of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Jian Yang
- Chengdu
Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, P. R. China
- University
of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Shuai He
- Southwest
Minzu University, Chengdu 610041, P. R. China
| | - Zhi-Chuan Shi
- Southwest
Minzu University, Chengdu 610041, P. R. China
| | - Xiao-Mei Zhang
- Chengdu
Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, P. R. China
| | - Ji-Yu Wang
- Chengdu
Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, P. R. China
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12
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Yu C, Patureau FW. Regioselective Oxidative Arylation of Fluorophenols. Angew Chem Int Ed Engl 2019; 58:18530-18534. [PMID: 31584740 PMCID: PMC6916641 DOI: 10.1002/anie.201910352] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Revised: 09/24/2019] [Indexed: 11/08/2022]
Abstract
A metal free and highly regioselective oxidative arylation reaction of fluorophenols is described. The relative position of the fluoride leaving group (i.e., ortho or para) controls the 1,2 or 1,4 nature of the arylated quinone product, lending versatility and generality to this oxidative, defluorinative, arylation concept.
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Affiliation(s)
- Congjun Yu
- Institute of Organic Chemistry, RWTH, Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Frederic W Patureau
- Institute of Organic Chemistry, RWTH, Aachen University, Landoltweg 1, 52074, Aachen, Germany
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13
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Affiliation(s)
- Congjun Yu
- Institut für Organische ChemieRWTH Aachen University Landoltweg 1 52074 Aachen Deutschland
| | - Frederic W. Patureau
- Institut für Organische ChemieRWTH Aachen University Landoltweg 1 52074 Aachen Deutschland
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14
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Affiliation(s)
- Yijun Wang
- School of Basic Medical Sciences; Zhengzhou University; Science Avenue 100 Zhengzhou 450001 P. R. China
| | - Shuai Zhu
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology; Ministry of Education, School of Pharmaceutical Sciences; Jiangnan University; Lihu Avenue 1800 Wuxi 214122 P. R. China
| | - Liang-Hua Zou
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology; Ministry of Education, School of Pharmaceutical Sciences; Jiangnan University; Lihu Avenue 1800 Wuxi 214122 P. R. China
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15
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de Carvalho RL, Jardim GAM, Santos ACC, Araujo MH, Oliveira WXC, Bombaça ACS, Menna‐Barreto RFS, Gopi E, Gravel E, Doris E, da Silva Júnior EN. Combination of Aryl Diselenides/Hydrogen Peroxide and Carbon‐Nanotube/Rhodium Nanohybrids for Naphthol Oxidation: An Efficient Route towards Trypanocidal Quinones. Chemistry 2018; 24:15227-15235. [DOI: 10.1002/chem.201802773] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Indexed: 11/09/2022]
Affiliation(s)
- Renato L. de Carvalho
- Institute of Exact SciencesDepartment of ChemistryFederal University of Minas Gerais, UFMG 31270-901 Belo Horizonte MG Brazil
| | - Guilherme A. M. Jardim
- Institute of Exact SciencesDepartment of ChemistryFederal University of Minas Gerais, UFMG 31270-901 Belo Horizonte MG Brazil
| | - Augusto C. C. Santos
- Institute of Exact SciencesDepartment of ChemistryFederal University of Minas Gerais, UFMG 31270-901 Belo Horizonte MG Brazil
| | - Maria H. Araujo
- Institute of Exact SciencesDepartment of ChemistryFederal University of Minas Gerais, UFMG 31270-901 Belo Horizonte MG Brazil
| | - Willian X. C. Oliveira
- Institute of Exact SciencesDepartment of ChemistryFederal University of Minas Gerais, UFMG 31270-901 Belo Horizonte MG Brazil
| | | | | | - Elumalai Gopi
- Service de Chimie Bioorganique et de Marquage (SCBM)CEAUniversité Paris-Saclay 91191 Gif-sur-Yvette France
| | - Edmond Gravel
- Service de Chimie Bioorganique et de Marquage (SCBM)CEAUniversité Paris-Saclay 91191 Gif-sur-Yvette France
| | - Eric Doris
- Service de Chimie Bioorganique et de Marquage (SCBM)CEAUniversité Paris-Saclay 91191 Gif-sur-Yvette France
| | - Eufrânio N. da Silva Júnior
- Institute of Exact SciencesDepartment of ChemistryFederal University of Minas Gerais, UFMG 31270-901 Belo Horizonte MG Brazil
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16
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Ponduru TT, Qiu C, Mao JX, Leghissa A, Smuts J, Schug KA, Dias HVR. Copper(i)-based oxidation of polycyclic aromatic hydrocarbons and product elucidation using vacuum ultraviolet spectroscopy and theoretical spectral calculations. NEW J CHEM 2018. [DOI: 10.1039/c8nj04740e] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fluorinated 1,3,5-triazapentadienyl complexes of copper catalyze the oxidation PAHs to quinones using H2O2as an oxidant under mild conditions.
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Affiliation(s)
- Tharun T. Ponduru
- Department of Chemistry and Biochemistry
- The University of Texas at Arlington
- Arlington
- USA
| | - Changling Qiu
- Department of Chemistry and Biochemistry
- The University of Texas at Arlington
- Arlington
- USA
| | - James X. Mao
- Department of Chemistry and Biochemistry
- The University of Texas at Arlington
- Arlington
- USA
| | - Allegra Leghissa
- Department of Chemistry and Biochemistry
- The University of Texas at Arlington
- Arlington
- USA
| | | | - Kevin A. Schug
- Department of Chemistry and Biochemistry
- The University of Texas at Arlington
- Arlington
- USA
| | - H. V. Rasika Dias
- Department of Chemistry and Biochemistry
- The University of Texas at Arlington
- Arlington
- USA
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17
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Kamble S, Vyas PP, Jayaram RV, Rode CV. Heterogeneously Catalyzed Domino Synthesis of 3-Indolylquinones Involving Direct Oxidative C-C Coupling of Hydroquinones and Indoles. ACS OMEGA 2017; 2:2238-2247. [PMID: 31457575 PMCID: PMC6640916 DOI: 10.1021/acsomega.7b00201] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Accepted: 05/03/2017] [Indexed: 06/10/2023]
Abstract
A domino synthesis of 3-indolylquinones was achieved successfully via direct oxidative C-C coupling of hydroquinones with indoles over Ag2O and Fe3O4/povidone-phosphotungstic acid (PVP-PWA) catalysts using H2O2 in tetrahydrofuran at room temperature. Ag2O catalyzed the in situ oxidation of hydroquinone and 3-indolylhydroquinone intermediates, whereas ferrite solid acid, Fe3O4/PVP-PWA, with a 1:4:1 ratio of Fe3O4, PVP, and PWA, catalyzed the activation of quinones. The efficiency of this catalytic domino approach was established by a broad scope of substrates involving a variety of hydroquinones and quinones to give high yields (81-97%) of 3-indolylquinones. Fe3O4/PVP-PWA was separated magnetically, whereas simple filtration could separate Ag2O, both of which could be recycled several times without losing their activities.
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Affiliation(s)
- Sumit
B. Kamble
- Chemical
Engineering and Process Development Division, CSIR-National Chemical Laboratory, Pune 411008, India
| | - Praneet P. Vyas
- Department
of Chemistry, Institute of Chemical Technology, Mumbai 400019, India
| | - Radha V. Jayaram
- Department
of Chemistry, Institute of Chemical Technology, Mumbai 400019, India
| | - Chandrashekhar V. Rode
- Chemical
Engineering and Process Development Division, CSIR-National Chemical Laboratory, Pune 411008, India
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18
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Chang YC, Yuan PT, Hong FE. C-H Bond Functionalization of 1,4-Benzoquinone by Silver-Mediated Regioselective Phosphination and Amination Reactions. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700109] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Yu-Chang Chang
- Department of Chemistry; National Chung Hsing University; 40227 Taichung Taiwan
| | - Pin-Ting Yuan
- Department of Chemistry; National Chung Hsing University; 40227 Taichung Taiwan
| | - Fung-E Hong
- Department of Chemistry; National Chung Hsing University; 40227 Taichung Taiwan
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