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Zhang R, Ma R, Chen R, Wang L, Ma Y. Regioselective C 3Alkylation of Indoles for the Synthesis of Bis(indolyl)methanes and 3-Styryl Indoles. J Org Chem 2024; 89:1846-1857. [PMID: 38214898 DOI: 10.1021/acs.joc.3c02551] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2024]
Abstract
Herein, we describe an efficient transition-metal-free regioselective C3alkylation of indoles for the synthesis of bis(indolyl)methanes and 3-styryl indoles. Nitrobenzene is employed as the oxidant to oxidize the alcohols in the presence of a strong base and the reaction avoids the use of transition metals such as Ru and Mn. The protocol provides a favorable route to access biologically active compounds such as arundine, vibrindole A, and turbomycin B.
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Affiliation(s)
- Ruiqin Zhang
- Institute of Advanced Studies and School of Pharmaceutical Sciences, Taizhou University, Jiaojiang 318000, P. R. China
- School of Pharmaceutical Science, Zhejiang Chinese Medical University, Hangzhou 310053, P. R. China
| | - Renchao Ma
- Institute of Advanced Studies and School of Pharmaceutical Sciences, Taizhou University, Jiaojiang 318000, P. R. China
| | - Rener Chen
- Institute of Advanced Studies and School of Pharmaceutical Sciences, Taizhou University, Jiaojiang 318000, P. R. China
| | - Lei Wang
- Institute of Advanced Studies and School of Pharmaceutical Sciences, Taizhou University, Jiaojiang 318000, P. R. China
- College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Hangzhou Normal University, Hangzhou 311121, P. R. China
| | - Yongmin Ma
- Institute of Advanced Studies and School of Pharmaceutical Sciences, Taizhou University, Jiaojiang 318000, P. R. China
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2
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Das M, Zamani L, Bratcher C, Musacchio PZ. Azolation of Benzylic C-H Bonds via Photoredox-Catalyzed Carbocation Generation. J Am Chem Soc 2023; 145:10.1021/jacs.2c12850. [PMID: 36757817 PMCID: PMC10409882 DOI: 10.1021/jacs.2c12850] [Citation(s) in RCA: 20] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Abstract
A visible-light photoredox-catalyzed method is reported that enables the coupling between benzylic C-H substrates and N-H azoles. Classically, medicinally relevant N-benzyl azoles are produced via harsh substitution conditions between the azole and a benzyl electrophile in the presence of strong bases at high temperatures. Use of C-H bonds as the alkylating partner streamlines the preparation of these important motifs. In this work, we report the use of N-alkoxypyridinium salts as a critically enabling reagent for the development of a general C(sp3)-H azolation. The platform enables the alkylation of electron-deficient, -neutral, and -rich azoles with a range of C-H bonds, most notably secondary and tertiary partners. Moreover, the protocol is mild enough to tolerate benzyl electrophiles, thus offering an orthogonal approach to existing SN2 and cross-coupling methods.
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Affiliation(s)
- Mrinmoy Das
- Department of Chemistry, Worcester Polytechnic Institute, Worcester, Massachusetts 01609, USA
| | - Leila Zamani
- Department of Chemistry, Worcester Polytechnic Institute, Worcester, Massachusetts 01609, USA
| | - Christopher Bratcher
- Department of Chemistry, Worcester Polytechnic Institute, Worcester, Massachusetts 01609, USA
| | - Patricia Z Musacchio
- Department of Chemistry, Worcester Polytechnic Institute, Worcester, Massachusetts 01609, USA
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3
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Lacker CR, DeLano TJ, Chen EP, Kong J, Belyk KM, Piou T, Reisman SE. Enantioselective Synthesis of N-Benzylic Heterocycles by Ni/Photoredox Dual Catalysis. J Am Chem Soc 2022; 144:20190-20195. [PMID: 36288571 PMCID: PMC10326726 DOI: 10.1021/jacs.2c07917] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An asymmetric cross-coupling of α-N-heterocyclic trifluoroborates with aryl bromides using Ni/photoredox dual catalysis has been developed. This C(sp2)-C(sp3) cross-coupling provides access to pharmaceutically relevant chiral N-benzylic heterocycles in good to excellent enantioselectivity when bioxazolines (BiOX) are used as the chiral ligand. High-throughput experimentation significantly streamlined reaction development by identifying BiOX ligands for further investigation and by allowing for rapid optimization of conditions for new trifluoroborate salts.
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Affiliation(s)
- Caitlin R. Lacker
- The Warren and Katharine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Travis J. DeLano
- The Warren and Katharine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Emily P. Chen
- The Warren and Katharine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Jongrock Kong
- Department of Process Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Kevin M. Belyk
- Department of Process Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Tiffany Piou
- Department of Process Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Sarah E. Reisman
- The Warren and Katharine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
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4
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Chen Z, Wang M, Ma J. Plasma‐Assisted Coupling Reactions of Dinitrogen and Carbon Dioxide Mediated by Monometallic YB
1–4
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⋅Anions: Carbon−Nitrogen Bond Formation. Chemistry 2022; 28:e202201170. [DOI: 10.1002/chem.202201170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Indexed: 11/11/2022]
Affiliation(s)
- Zhi‐Ying Chen
- Key Laboratory of Cluster Science of Ministry of Education Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials School of Chemistry and Chemical Engineering Beijing Institute of Technology 102488 Beijing P. R. China
| | - Ming Wang
- Key Laboratory of Cluster Science of Ministry of Education Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials School of Chemistry and Chemical Engineering Beijing Institute of Technology 102488 Beijing P. R. China
| | - Jia‐Bi Ma
- Key Laboratory of Cluster Science of Ministry of Education Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials School of Chemistry and Chemical Engineering Beijing Institute of Technology 102488 Beijing P. R. China
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5
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IL-Functionalized Mg 3Al-LDH as New Efficient Adsorbent for Pd Recovery from Aqueous Solutions. Int J Mol Sci 2022; 23:ijms23169107. [PMID: 36012371 PMCID: PMC9409223 DOI: 10.3390/ijms23169107] [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: 07/01/2022] [Revised: 08/10/2022] [Accepted: 08/11/2022] [Indexed: 11/16/2022] Open
Abstract
Palladium is a noble metal of the platinum group metals (PGMs) with a high value and major industrial applications. Due to the scarce palladium resources, researchers' attention is currently focused on Pd ions recovery from secondary sources. Regarding the recovery process from aqueous solutions, many methods were studied, amongst which adsorption process gained a special attention due to its clear advantages. Moreover, the efficiency and the selectivity of an adsorbent material can be further improved by functionalization of various solid supports. In this context, the present work aims at the synthesis and characterization of Mg3Al-LDH and its functionalization with ionic liquid (IL) (Methyltrialkylammonium chloride) to obtain adsorbent materials with high efficiency in Pd removal from aqueous solutions. The maximum adsorption capacity developed by Mg3Al-LDH is 142.9 mg Pd., and depending on the functionalization method used (sonication and co-synthesis, respectively) the maximum adsorption capacity increases considerably, qmax-Mg3Al IL-US = 227.3 mg/g and qmax-Mg3Al IL-COS = 277.8 mg/g.
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Wang F, Fu R, Chen J, Rong J, Wang E, Zhang J, Zhang Z, Jiang Y. Metal-free synthesis of gem-difluorinated heterocycles from enaminones and difluorocarbene precursors. Chem Commun (Camb) 2022; 58:3477-3480. [PMID: 35191446 DOI: 10.1039/d2cc00383j] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A cascade strategy to synthesise gem-difluorinated 2H-furans from reactions of BrCF2CO2Et with enaminones has been described. The reactions tolerate a wide variety of functional groups under metal-free conditions. An active aminocyclopropane is proposed to be a key intermediate through the cyclopropanation of difluorocarbene with enaminones, which further triggers a regioselective C-C bond cleavage in situ to afford the corresponding gem-difluorinated 2H-furans.
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Affiliation(s)
- Fei Wang
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, College of Food Science and Light Industry, Nanjing Tech University, Nanjing, 211816, China.
| | - Rui Fu
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, College of Food Science and Light Industry, Nanjing Tech University, Nanjing, 211816, China.
| | - Jie Chen
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, College of Food Science and Light Industry, Nanjing Tech University, Nanjing, 211816, China. .,Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering Ministry of Education, Guizhou University, Huaxi District, Guiyang, 550025, China
| | - Jiaxin Rong
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, College of Food Science and Light Industry, Nanjing Tech University, Nanjing, 211816, China.
| | - Enfu Wang
- Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering Ministry of Education, Guizhou University, Huaxi District, Guiyang, 550025, China
| | - Jian Zhang
- Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering Ministry of Education, Guizhou University, Huaxi District, Guiyang, 550025, China
| | - Zhengyu Zhang
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, College of Food Science and Light Industry, Nanjing Tech University, Nanjing, 211816, China.
| | - Yaojia Jiang
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, College of Food Science and Light Industry, Nanjing Tech University, Nanjing, 211816, China. .,Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering Ministry of Education, Guizhou University, Huaxi District, Guiyang, 550025, China
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7
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Wang Y, Li F, Zeng Q. Advances in Formation of C—X Bonds via Cleavage of C—N Bond of Quaternary Ammonium Salts. ACTA CHIMICA SINICA 2022. [DOI: 10.6023/a21110536] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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8
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Oeser P, Koudelka J, Petrenko A, Tobrman T. Recent Progress Concerning the N-Arylation of Indoles. Molecules 2021; 26:molecules26165079. [PMID: 34443667 PMCID: PMC8402097 DOI: 10.3390/molecules26165079] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2021] [Revised: 08/17/2021] [Accepted: 08/18/2021] [Indexed: 11/16/2022] Open
Abstract
This review summarizes the current state-of-the-art procedures in terms of the preparation of N-arylindoles. After a short introduction, the transition-metal-free procedures available for the N-arylation of indoles are briefly discussed. Then, the nickel-catalyzed and palladium-catalyzed N-arylation of indoles are both discussed. In the next section, copper-catalyzed procedures for the N-arylation of indoles are described. The final section focuses on recent findings in the field of biologically active N-arylindoles.
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Tu Y, Zhao J. Recent Advances in the Pd-Catalyzed Coupling of Arylhydrazines and Ammonium Salts via C-N Bond Cleavage. CHEM REC 2021; 21:3442-3457. [PMID: 34174146 DOI: 10.1002/tcr.202100089] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2021] [Revised: 05/18/2021] [Accepted: 05/20/2021] [Indexed: 11/09/2022]
Abstract
Both arylhydrazines and quaternary ammonium salts are readily accessible or commercially available chemicals that show versatile reactivity in Pd-catalyzed coupling reactions via C-N bond cleavage. A tremendous array of coupling reactions involving reaction partners such as organoborons, aryl silanes, alkenes, alkynes, arylation or alkylation reagents in C-H functionalization and carbonylation reactions are summarized, in which arylhydrazines or quaternary ammonium salts function as aryl or alkyl donors. This account mainly focuses on recent advances in Pd-catalyzed coupling reactions with arylhydrazines or quaternary ammonium salts via C-N bond cleavage, including mechanistic elucidations.
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Affiliation(s)
- Yongliang Tu
- School of Pharmaceutical Sciences, Guangzhou Medical University, Guangzhou, Guangdong, 511436, China.,Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, D-52074, Aachen, Germany
| | - Junfeng Zhao
- School of Pharmaceutical Sciences, Guangzhou Medical University, Guangzhou, Guangdong, 511436, China
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10
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Liu J, Yang Y, Ouyang K, Zhang WX. Transition-metal-catalyzed transformations of C–N single bonds: Advances in the last five years, challenges and prospects. GREEN SYNTHESIS AND CATALYSIS 2021. [DOI: 10.1016/j.gresc.2021.04.005] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
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11
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Washington JB, Assante M, Yan C, McKinney D, Juba V, Leach AG, Baillie SE, Reid M. Trialkylammonium salt degradation: implications for methylation and cross-coupling. Chem Sci 2021; 12:6949-6963. [PMID: 34123322 PMCID: PMC8153232 DOI: 10.1039/d1sc00757b] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Trialkylammonium (most notably N,N,N-trimethylanilinium) salts are known to display dual reactivity through both the aryl group and the N-methyl groups. These salts have thus been widely applied in cross-coupling, aryl etherification, fluorine radiolabelling, phase-transfer catalysis, supramolecular recognition, polymer design, and (more recently) methylation. However, their application as electrophilic methylating reagents remains somewhat underexplored, and an understanding of their arylation versus methylation reactivities is lacking. This study presents a mechanistic degradation analysis of N,N,N-trimethylanilinium salts and highlights the implications for synthetic applications of this important class of salts. Kinetic degradation studies, in both solid and solution phases, have delivered insights into the physical and chemical parameters affecting anilinium salt stability. 1H NMR kinetic analysis of salt degradation has evidenced thermal degradation to methyl iodide and the parent aniline, consistent with a closed-shell SN2-centred degradative pathway, and methyl iodide being the key reactive species in applied methylation procedures. Furthermore, the effect of halide and non-nucleophilic counterions on salt degradation has been investigated, along with deuterium isotope and solvent effects. New mechanistic insights have enabled the investigation of the use of trimethylanilinium salts in O-methylation and in improved cross-coupling strategies. Finally, detailed computational studies have helped highlight limitations in the current state-of-the-art of solvation modelling of reaction in which the bulk medium undergoes experimentally observable changes over the reaction timecourse. The dual reactivity of N,N,N-trimethylanilinium salts towards arylation and methylation is decoupled in this mechanistic investigation to enable more strategic application of these salts in either reaction class.![]()
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Affiliation(s)
- Jack B Washington
- WestCHEM Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building 295 Cathedral Street Glasgow UK
| | - Michele Assante
- School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University Byrom Street Liverpool UK
| | - Chunhui Yan
- WestCHEM Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building 295 Cathedral Street Glasgow UK
| | - David McKinney
- WestCHEM Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building 295 Cathedral Street Glasgow UK
| | - Vanessa Juba
- WestCHEM Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building 295 Cathedral Street Glasgow UK
| | - Andrew G Leach
- Division of Pharmacy and Optometry, University of Manchester Stopford Building Oxford Road Manchester UK
| | | | - Marc Reid
- WestCHEM Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building 295 Cathedral Street Glasgow UK
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12
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Liu L, Tang Y, Wang K, Huang T, Chen T. Transition-Metal-Free and Base-Promoted Carbon–Heteroatom Bond Formation via C–N Cleavage of Benzyl Ammonium Salts. J Org Chem 2021; 86:4159-4170. [DOI: 10.1021/acs.joc.0c02992] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Long Liu
- Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources, Hainan Provincial Key Laboratory of Fine Chemical, Hainan Provincial Fine Chemical Engineering Research Center, Hainan University, Haikou 570228, China
| | - Yuanyuan Tang
- Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources, Hainan Provincial Key Laboratory of Fine Chemical, Hainan Provincial Fine Chemical Engineering Research Center, Hainan University, Haikou 570228, China
| | - Kunyu Wang
- Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources, Hainan Provincial Key Laboratory of Fine Chemical, Hainan Provincial Fine Chemical Engineering Research Center, Hainan University, Haikou 570228, China
| | - Tianzeng Huang
- Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources, Hainan Provincial Key Laboratory of Fine Chemical, Hainan Provincial Fine Chemical Engineering Research Center, Hainan University, Haikou 570228, China
| | - Tieqiao Chen
- Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources, Hainan Provincial Key Laboratory of Fine Chemical, Hainan Provincial Fine Chemical Engineering Research Center, Hainan University, Haikou 570228, China
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13
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Li F, Wang D, Chen H, He Z, Zhou L, Zeng Q. Transition metal-free coupling reactions of benzylic trimethylammonium salts with di(hetero)aryl disulfides and diselenides. Chem Commun (Camb) 2020; 56:13029-13032. [PMID: 33000829 DOI: 10.1039/d0cc05633b] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new protocol was developed to synthesize (enantioenriched) thioethers and selenoethers from (chiral) benzylic trimethylammonium salts and di(hetero)aryl disulfides or diselenides. These syntheses were promoted by the presence of weak base and did not require the use of any transition metal, and resulted in the target products with good to excellent yields (72-94%). Using quaternary ammonium salts synthesized from enantiomerically enriched amines led to highly enantiopure benzylic thioethers and selenoethers (94-99% ee) with configurations reversed from those of their enantioenriched quaternary ammonium salts.
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Affiliation(s)
- Fuhai Li
- State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, College of Materials, Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China.
| | - Dan Wang
- State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, College of Materials, Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China.
| | - Hongyi Chen
- State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, College of Materials, Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China.
| | - Ze He
- State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, College of Materials, Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China.
| | - Lihong Zhou
- College of Environment and Ecology, Chengdu University of Technology, Chengdu 610059, China
| | - Qingle Zeng
- State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, College of Materials, Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China.
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14
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Garcı́a-Cárceles J, Bahou KA, Bower JF. Recent Methodologies That Exploit Oxidative Addition of C–N Bonds to Transition Metals. ACS Catal 2020. [DOI: 10.1021/acscatal.0c03341] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
| | - Karim A. Bahou
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, United Kingdom
| | - John F. Bower
- School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, United Kingdom
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15
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Huang Y, Chen H, Zheng W, Zeng Q. Cu2O-catalyzed C–S coupling of quaternary ammonium salts and sodium alkane-/arene-sulfinates. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.152320] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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16
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Sar S, Tripathi A, Dubey KD, Sen S. Iodine-Catalyzed Aerobic Diazenylation-Amination of Indole Derivatives. J Org Chem 2020; 85:3748-3756. [PMID: 32019297 DOI: 10.1021/acs.joc.9b03392] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
A mild strategy for consecutive diazenylation and amination of indole moieties has been demonstrated. The functionalization occurs at C3 and C2 carbon atoms, respectively, at the indole scaffold in the presence of catalytic iodine and air at 40 °C in the 1,1,1,3,3,3-hexafluoroisopropanol (HFIP) solvent. It is noteworthy that the aromatic amines are generated in situ by the reaction of aryl hydrazine with iodine. In general, bright red products are obtained in moderate to good yield. Control reactions are conducted to establish the reaction mechanism.
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Affiliation(s)
- Saibal Sar
- Department of Chemistry, School of Natural Sciences, Shiv Nadar University, Dadri, Chithera, Greater Noida, Gautam Budh Nagar, UP 201314, India
| | - Ankita Tripathi
- Department of Chemistry, School of Natural Sciences, Shiv Nadar University, Dadri, Chithera, Greater Noida, Gautam Budh Nagar, UP 201314, India
| | - Kshatresh Dutta Dubey
- Department of Chemistry, School of Natural Sciences, Shiv Nadar University, Dadri, Chithera, Greater Noida, Gautam Budh Nagar, UP 201314, India
| | - Subhabrata Sen
- Department of Chemistry, School of Natural Sciences, Shiv Nadar University, Dadri, Chithera, Greater Noida, Gautam Budh Nagar, UP 201314, India
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17
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Wang ZX, Yang B. Chemical transformations of quaternary ammonium salts via C–N bond cleavage. Org Biomol Chem 2020; 18:1057-1072. [DOI: 10.1039/c9ob02667c] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The reaction of quaternary ammonium salts via C–N bond cleavage to construct C–C, C–H and C–heteroatom bonds is summarized.
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Affiliation(s)
- Zhong-Xia Wang
- CAS Key Laboratory of Soft Matter Chemistry and Department of Chemistry
- University of Science and Technology of China
- Hefei
- P. R. China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)
| | - Bo Yang
- CAS Key Laboratory of Soft Matter Chemistry and Department of Chemistry
- University of Science and Technology of China
- Hefei
- P. R. China
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18
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Tan M, Zheng W, Yang L, Zhou L, Zeng Q. I
2
‐Catalyzed Oxidative N−P Cross‐Coupling of Diarylphosphine Oxides and Sulfoximines. ASIAN J ORG CHEM 2019. [DOI: 10.1002/ajoc.201900476] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Mingchao Tan
- State Key Laboratory of Geohazard Prevention and Geoenvironment Protection College of Materials, Chemistry & Chemical EngineeringChengdu University of Technology Chengdu 610059 P. R. China
| | - Wenting Zheng
- State Key Laboratory of Geohazard Prevention and Geoenvironment Protection College of Materials, Chemistry & Chemical EngineeringChengdu University of Technology Chengdu 610059 P. R. China
| | - Lu Yang
- Department of Chemistry Graduate School of ScienceTohoku University 6-3 Azaaoba Aramaki, Aoba-ku Sendai 980-8578 Japan
| | - Lihong Zhou
- College of Environment and EcologyChengdu University of Technology Chengdu 610059 P. R. China
| | - Qingle Zeng
- State Key Laboratory of Geohazard Prevention and Geoenvironment Protection College of Materials, Chemistry & Chemical EngineeringChengdu University of Technology Chengdu 610059 P. R. China
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