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Son SH, Shin JW, Won HJ, Yoo HS, Cho YY, Kim SL, Jang YH, Park BY, Kim NJ. Synthesis of meta-(Indol-3-yl)phenols from Indoles and Cyclohexenone via Palladium(II)-Catalyzed Oxidative Heck Reaction and Dehydrogenative Aromatization in a One-Step Sequence. Org Lett 2021; 23:7467-7471. [PMID: 34523938 DOI: 10.1021/acs.orglett.1c02679] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Facile construction of a meta-(indol-3-yl)phenol framework with a wide substrate scope (a total of 25 compounds) via a palladium(II)-catalyzed oxidative Heck reaction and dehydrogenative aromatization in a one-step sequence is reported. This methodology affords a novel route for the privileged structures that are challenging to access via a direct link between indole and phenol, in a highly efficient and atom-economical manner.
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Affiliation(s)
- Seung Hwan Son
- College of Pharmacy, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Republic of Korea
| | - Jeong-Won Shin
- Department of Life and Nanopharmaceutical Sciences, Graduate School, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Republic of Korea
| | - Hyuck-Jae Won
- College of Pharmacy, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Republic of Korea
| | - Hyung-Seok Yoo
- College of Pharmacy, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Republic of Korea
| | - Yang Yil Cho
- College of Pharmacy, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Republic of Korea
| | - Soo Lim Kim
- Department of Life and Nanopharmaceutical Sciences, Graduate School, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Republic of Korea
| | - Yoon Hu Jang
- Department of Life and Nanopharmaceutical Sciences, Graduate School, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Republic of Korea
| | - Boyoung Y Park
- College of Pharmacy, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Republic of Korea
| | - Nam-Jung Kim
- College of Pharmacy, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Republic of Korea.,Department of Life and Nanopharmaceutical Sciences, Graduate School, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Republic of Korea
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2
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Anilkumar G, Aneeja T, M A Afsina C. Recent Advances in the Microwave Assisted Synthesis of Benzofuran and Indole Derivatives. HETEROCYCLES 2021. [DOI: 10.3987/rev-20-sr(k)1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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3
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Khan F, Fatima M, Shirzaei M, Vo Y, Amarasiri M, Banwell MG, Ma C, Ward JS, Gardiner MG. Tandem Ullmann-Goldberg Cross-Coupling/Cyclopalladation-Reductive Elimination Reactions and Related Sequences Leading to Polyfunctionalized Benzofurans, Indoles, and Phthalanes. Org Lett 2019; 21:6342-6346. [PMID: 31364356 DOI: 10.1021/acs.orglett.9b02235] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
On exposure to a combination of Cu[I]- and Pd[0]-based catalysts, compounds such as 1 and 7 engage in tandem Ullmann-Goldberg cross-coupling and cyclopalladation-reductive elimination reactions to give benzofurans such as 8. Related reactions involving hetero-Michael additions of o-halogenated phenols or anilines to propiolates and the Pd[0]-catalyzed cyclization of the resulting conjugates provide, in a one-pot process, alternately functionalized benzofurans, indoles, or phthalanes.
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Affiliation(s)
- Faiyaz Khan
- Research School of Chemistry, Institute of Advanced Studies , The Australian National University , Canberra , Australian Capital Territory 2601 , Australia
| | - Mehvish Fatima
- Research School of Chemistry, Institute of Advanced Studies , The Australian National University , Canberra , Australian Capital Territory 2601 , Australia
| | - Moheb Shirzaei
- Research School of Chemistry, Institute of Advanced Studies , The Australian National University , Canberra , Australian Capital Territory 2601 , Australia
| | - Yen Vo
- Research School of Chemistry, Institute of Advanced Studies , The Australian National University , Canberra , Australian Capital Territory 2601 , Australia
| | - Madushani Amarasiri
- Research School of Chemistry, Institute of Advanced Studies , The Australian National University , Canberra , Australian Capital Territory 2601 , Australia
| | - Martin G Banwell
- Research School of Chemistry, Institute of Advanced Studies , The Australian National University , Canberra , Australian Capital Territory 2601 , Australia
| | - Chenxi Ma
- Research School of Chemistry, Institute of Advanced Studies , The Australian National University , Canberra , Australian Capital Territory 2601 , Australia
| | - Jas S Ward
- Research School of Chemistry, Institute of Advanced Studies , The Australian National University , Canberra , Australian Capital Territory 2601 , Australia
| | - Michael G Gardiner
- Research School of Chemistry, Institute of Advanced Studies , The Australian National University , Canberra , Australian Capital Territory 2601 , Australia
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4
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Kang TH, Lee HI. Microwave-Assisted Synthesis of Core-Crosslinked Star Polymers with Benzophenone Derivatives in the Core. Macromol Res 2019. [DOI: 10.1007/s13233-019-7064-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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5
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Affiliation(s)
- So Won Youn
- Center for New Directions in Organic Synthesis, Department of Chemistry and Institute for Natural Sciences; Hanyang University; Seoul 04763 Korea
| | - Tae Yun Ko
- Center for New Directions in Organic Synthesis, Department of Chemistry and Institute for Natural Sciences; Hanyang University; Seoul 04763 Korea
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6
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Jana S, Verma A, Kadu R, Kumar S. Visible-light-induced oxidant and metal-free dehydrogenative cascade trifluoromethylation and oxidation of 1,6-enynes with water. Chem Sci 2017; 8:6633-6644. [PMID: 28989690 PMCID: PMC5625288 DOI: 10.1039/c7sc02556d] [Citation(s) in RCA: 98] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Accepted: 07/08/2017] [Indexed: 12/30/2022] Open
Abstract
Unprecedented light-induced oxidant and metal-free tandem radical cyclization–trifluoromethylation and dehydrogenative oxygenation of 1,6-enynes have been achieved using a photoredox catalyst, CF3SO2Na, and water as the oxygen source.
Generally, oxy-trifluoromethylation in olefins is achieved using oxidants and transition metal catalysts. However, labile olefins remain unexplored due to their incompatibility with harsh reaction conditions. Here, unprecedented light-induced oxidant and metal-free tandem radical cyclization–trifluoromethylation and dehydrogenative oxygenation of 1,6-enynes have been achieved using a photoredox catalyst, CF3SO2Na, and phenanthrene-9,10-dione (PQ), Langlois’ reagent (CF3SO2Na) and water as the oxygen source. This benign protocol allows for access to various CF3-containing C3-aryloyl/acylated benzofurans, benzothiophenes, and indoles. Moreover, the oxidized undesired products, which are inherently formed by the cleavage of the vinylic carbon and heteroatom bond, have been circumvented under oxidant free conditions. The mechanistic investigations by UV-visible and ESR spectroscopy, electrochemical studies, isotope labelling and density functional theory (DFT) suggest that light induced PQ produced a CF3 radical from CF3SO2Na. The generated CF3 radical adds to the alkene, followed by cyclization, to provide a vinylic radical that transfers an electron to PQ and generates a vinylic cation. Alternatively, electron transfer may occur from the CF3-added alkene moiety, forming a carbocation, which would undergo cationic cyclization to generate a vinylic carbocation. The subsequent addition of water to the vinylic cation, followed by the elimination of hydrogen gas, led to the formation of trifluoromethylated C3-aryloyl/acylated heterocycles.
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Affiliation(s)
- Sadhan Jana
- Department of Chemistry , Indian Institute of Science Education and Research (IISER) Bhopal , Bhopal By-pass Road, Bhauri , Bhopal-462066 , India . ; http://home.iiserbhopal.ac.in/∼sangitkumar/
| | - Ajay Verma
- Department of Chemistry , Indian Institute of Science Education and Research (IISER) Bhopal , Bhopal By-pass Road, Bhauri , Bhopal-462066 , India . ; http://home.iiserbhopal.ac.in/∼sangitkumar/
| | - Rahul Kadu
- Department of Chemistry , Indian Institute of Science Education and Research (IISER) Bhopal , Bhopal By-pass Road, Bhauri , Bhopal-462066 , India . ; http://home.iiserbhopal.ac.in/∼sangitkumar/
| | - Sangit Kumar
- Department of Chemistry , Indian Institute of Science Education and Research (IISER) Bhopal , Bhopal By-pass Road, Bhauri , Bhopal-462066 , India . ; http://home.iiserbhopal.ac.in/∼sangitkumar/
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Youn SW, Ko TY, Jang YH. Palladium-Catalyzed Regioselective Synthesis of 3-Arylindoles from N
-Ts-Anilines and Styrenes. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201702205] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- So Won Youn
- Center for New Directions in Organic Synthesis; Department of Chemistry and Institute for Material Design; Hanyang University; Seoul 04763 Korea
| | - Tae Yun Ko
- Center for New Directions in Organic Synthesis; Department of Chemistry and Institute for Material Design; Hanyang University; Seoul 04763 Korea
| | - Young Ho Jang
- Center for New Directions in Organic Synthesis; Department of Chemistry and Institute for Material Design; Hanyang University; Seoul 04763 Korea
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8
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Youn SW, Ko TY, Jang YH. Palladium-Catalyzed Regioselective Synthesis of 3-Arylindoles from N
-Ts-Anilines and Styrenes. Angew Chem Int Ed Engl 2017; 56:6636-6640. [DOI: 10.1002/anie.201702205] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Revised: 03/27/2017] [Indexed: 12/31/2022]
Affiliation(s)
- So Won Youn
- Center for New Directions in Organic Synthesis; Department of Chemistry and Institute for Material Design; Hanyang University; Seoul 04763 Korea
| | - Tae Yun Ko
- Center for New Directions in Organic Synthesis; Department of Chemistry and Institute for Material Design; Hanyang University; Seoul 04763 Korea
| | - Young Ho Jang
- Center for New Directions in Organic Synthesis; Department of Chemistry and Institute for Material Design; Hanyang University; Seoul 04763 Korea
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Jang SS, Youn SW. The cooperative FeCl3/DDQ system for the regioselective synthesis of 3-arylindoles from β-monosubstituted 2-alkenylanilines. Org Biomol Chem 2016; 14:2200-4. [DOI: 10.1039/c6ob00074f] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A highly regioselective synthesis of 3-arylindoles by using the cooperative FeCl3/DDQ system has been developed.
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Affiliation(s)
- Su San Jang
- Center for New Directions in Organic Synthesis
- Department of Chemistry and Research Institute for Natural Sciences
- Hanyang University
- Seoul 133-791
- Korea
| | - So Won Youn
- Center for New Directions in Organic Synthesis
- Department of Chemistry and Research Institute for Natural Sciences
- Hanyang University
- Seoul 133-791
- Korea
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Gigant N, Chausset-Boissarie L, Gillaizeau I. Direct metal-catalyzed regioselective functionalization of enamides. Chemistry 2014; 20:7548-64. [PMID: 24862089 DOI: 10.1002/chem.201402070] [Citation(s) in RCA: 101] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Enamides are stable enamine surrogates and provide key intermediates for the synthesis of small but complex nitrogen-containing compounds. Metal-catalyzed regioselective functionalization of enamides provides a rapid method to synthesize useful nitrogen containing heterocycles. This review discloses the recent progress made in the development of the C-H functionalization of enamides involving efficient and atom-economical routes. Syntheses of different heterocycles are classified based on the site reactivity of enamides and key mechanistic insights are given for each transformation.
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Affiliation(s)
- Nicolas Gigant
- Institut de Chimie Organique et Analytique, UMR 7311, CNRS, Université d'Orléans, rue de Chartres, 45067 Orléans cedex 2 (France), Fax: (+33) 2-38-41-72-81
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