1
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Sindhe H, Saiyed N, Kamble A, Mounika Reddy M, Singh A, Sharma S. Catalytic and Chemodivergent Synthesis of 1-Substituted 9 H-Pyrrolo[1,2- a]indoles via Annulation of β-CF 3 Enones with 3-Substituted Indoles. J Org Chem 2023; 88:230-244. [PMID: 36503232 DOI: 10.1021/acs.joc.2c02240] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Chemodivergent reactions are more advantageous in organic synthesis that yield diversely functionalized scaffolds from common starting materials. Herein, we report an efficient metal-free chemodivergent protocol for the synthesis of 1-substituted 9H-pyrrolo[1,2-a]indole derivatives in the presence of catalytic amounts of Lewis acid/Brønsted acid conditions using 3-substituted indoles and β-trifluoromethyl-α,β-unsaturated ketones. Fine-tuning of the catalyst and solvent system in the reaction conditions deliver the trifluoromethyl, trifluoroethylcarboxylate, or carboxylic acid substituents on the C1-position of 9H-pyrrolo[1,2-a]indole derivatives in situ. It is postulated that the solvent and LA/BA catalyst interaction was found to be crucial for the catalytic C-F activation in these transformations.
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Affiliation(s)
- Haritha Sindhe
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research-Ahmedabad, Gandhinagar, Gujarat 382355, India
| | - Nehanaz Saiyed
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research-Ahmedabad, Gandhinagar, Gujarat 382355, India
| | - Akshay Kamble
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research-Ahmedabad, Gandhinagar, Gujarat 382355, India
| | - Malladi Mounika Reddy
- Department of Natural Products, National Institute of Pharmaceutical Education and Research-Ahmedabad, Gandhinagar, Gujarat 382355, India
| | - Amardeep Singh
- Department of Natural Products, National Institute of Pharmaceutical Education and Research-Ahmedabad, Gandhinagar, Gujarat 382355, India
| | - Satyasheel Sharma
- Department of Natural Products, National Institute of Pharmaceutical Education and Research-Ahmedabad, Gandhinagar, Gujarat 382355, India
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2
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Wang K, Yu YJ, Wang XQ, Bai YQ, Chen MW, Zhou YG. Palladium-Catalyzed Asymmetric Hydrogenation of Unprotected 3-Substituted Indoles. J Org Chem 2022; 87:10398-10407. [PMID: 35867907 DOI: 10.1021/acs.joc.2c00702] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A palladium-catalyzed asymmetric hydrogenation of unprotected 3-substituted indoles was developed, providing a series of 3-substituted indolines in excellent yields with ≤94.4:5.6 er. The large sterically hindered bisphosphine ligand played a crucial role in the enantioselective control. In addition, the gram-scale hydrogenation experiment and product derivatizations were performed successfully.
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Affiliation(s)
- Kun Wang
- Zhang Dayu School of Chemistry, Dalian University of Technology, Dalian 116024, P. R. China
| | - Yan-Jiang Yu
- Zhang Dayu School of Chemistry, Dalian University of Technology, Dalian 116024, P. R. China
| | - Xiao-Qing Wang
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China
| | - Yu-Qing Bai
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China
| | - Mu-Wang Chen
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China
| | - Yong-Gui Zhou
- Zhang Dayu School of Chemistry, Dalian University of Technology, Dalian 116024, P. R. China.,State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China
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3
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Cheng X, Wang L, Liu Y, Wan X, Xiang Z, Li R, Wan X. Molecular Iodine‐Catalysed Reductive Alkylation of Indoles: Late‐Stage Diversification for Bioactive Molecules. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Xionglve Cheng
- Soochow University College of Chemistry, Chemical Engineering and Materials Science 215123 Suzhou CHINA
| | - Lili Wang
- Soochow University College of Chemistry, Chemical Engineering and Materials Science 215123 Suzhou CHINA
| | - Yide Liu
- Soochow University College of Chemistry, Chemical Engineering and Materials Science 215123 Suzhou CHINA
| | - Xiao Wan
- Soochow University College of Chemistry, Chemical Engineering and Materials Science 215123 Suzhou CHINA
| | - Zixin Xiang
- Soochow University College of Chemistry, Chemical Engineering and Materials Science 215123 Suzhou CHINA
| | - Ruyi Li
- Soochow University College of Chemistry, Chemical Engineering and Materials Science 215123 Suzhou CHINA
| | - Xiaobing Wan
- Soochow University College of Chemistry, Chemical Engineering and Materials Science Renai road 215123 Suzhou CHINA
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4
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Ma X, Liu Y, Wang Z, Zhao X, Mi P, Zhang J. Ethylene tri-/tetramerization catalysts supported by diphosphinoindole ligands. J Organomet Chem 2022. [DOI: 10.1016/j.jorganchem.2021.122175] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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5
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Clanton NA, Spiller TE, Ortiz E, Gao Z, Rodriguez-Poirier JM, DelMonte AJ, Frantz DE. A Metal-Free Reductive N-Alkylation of Indoles with Aldehydes. Org Lett 2021; 23:3233-3236. [PMID: 33630601 DOI: 10.1021/acs.orglett.1c00179] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A simple metal-free method has been developed for the reductive N-alkylation of indoles employing aldehydes as the alkylating agent and inexpensive Et3SiH as the reductant. A wide range of aromatic and aliphatic aldehydes are viable substrates along with a variety of substituted indoles. In addition, the method was applied to a one-pot sequential 1,3-alkylation of a substituted indole and successfully demonstrated on a 100 mmol scale.
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Affiliation(s)
- Nicholas A Clanton
- Department of Chemistry, The University of Texas at San Antonio, San Antonio, Texas 78249, United States
| | - Taylor E Spiller
- Department of Chemistry, The University of Texas at San Antonio, San Antonio, Texas 78249, United States
| | - Eliezer Ortiz
- Department of Chemistry, The University of Texas at San Antonio, San Antonio, Texas 78249, United States
| | - Zhinong Gao
- Chemical Process Development, Bristol-Myers Squibb, 1 Squibb Drive, New Brunswick, New Jersey 08901, United States
| | | | - Albert J DelMonte
- Chemical Process Development, Bristol-Myers Squibb, 1 Squibb Drive, New Brunswick, New Jersey 08901, United States
| | - Doug E Frantz
- Department of Chemistry, The University of Texas at San Antonio, San Antonio, Texas 78249, United States
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6
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Kirsch JK, Manske JL, Wolfe JP. Pd-Catalyzed Alkene Carboheteroarylation Reactions for the Synthesis of 3-Cyclopentylindole Derivatives. J Org Chem 2018; 83:13568-13573. [PMID: 30351050 DOI: 10.1021/acs.joc.8b02165] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The Pd-catalyzed alkene carboheteroarylation of aryl and alkenyl triflate electrophiles bearing pendant alkenes with heteroaromatic nucleophiles affords substituted carbocycles with 3-indolyl or 3-pyrrolyl groups. The products are obtained in moderate to good yields, and the use of alkenyl triflate substrates produces products with high diastereoselectivities. The transformation is believed to proceed via a Friedel-Crafts-like reaction between the heteroaromatic nucleophile and an intermediate electrophilic palladium complex.
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Affiliation(s)
- Janelle K Kirsch
- Department of Chemistry , University of Michigan , 930 North University Avenue , Ann Arbor , Michigan 48109-1055 , United States
| | - Jenna L Manske
- Department of Chemistry , University of Michigan , 930 North University Avenue , Ann Arbor , Michigan 48109-1055 , United States
| | - John P Wolfe
- Department of Chemistry , University of Michigan , 930 North University Avenue , Ann Arbor , Michigan 48109-1055 , United States
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7
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Bien J, Davulcu A, DelMonte AJ, Fraunhoffer KJ, Gao Z, Hang C, Hsiao Y, Hu W, Katipally K, Littke A, Pedro A, Qiu Y, Sandoval M, Schild R, Soltani M, Tedesco A, Vanyo D, Vemishetti P, Waltermire RE. The First Kilogram Synthesis of Beclabuvir, an HCV NS5B Polymerase Inhibitor. Org Process Res Dev 2018. [DOI: 10.1021/acs.oprd.8b00214] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Jeffrey Bien
- Chemical and Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, P.O. Box 191, New Brunswick, New Jersey 08903, United States
| | - Akin Davulcu
- Chemical and Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, P.O. Box 191, New Brunswick, New Jersey 08903, United States
| | - Albert J. DelMonte
- Chemical and Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, P.O. Box 191, New Brunswick, New Jersey 08903, United States
| | - Kenneth J. Fraunhoffer
- Chemical and Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, P.O. Box 191, New Brunswick, New Jersey 08903, United States
| | - Zhinong Gao
- Chemical and Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, P.O. Box 191, New Brunswick, New Jersey 08903, United States
| | - Chao Hang
- Chemical and Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, P.O. Box 191, New Brunswick, New Jersey 08903, United States
| | - Yi Hsiao
- Chemical and Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, P.O. Box 191, New Brunswick, New Jersey 08903, United States
| | - Wenhao Hu
- Chemical and Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, P.O. Box 191, New Brunswick, New Jersey 08903, United States
| | - Kishta Katipally
- Chemical and Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, P.O. Box 191, New Brunswick, New Jersey 08903, United States
| | - Adam Littke
- Chemical and Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, P.O. Box 191, New Brunswick, New Jersey 08903, United States
| | - Aghogho Pedro
- Chemical and Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, P.O. Box 191, New Brunswick, New Jersey 08903, United States
| | - Yuping Qiu
- Chemical and Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, P.O. Box 191, New Brunswick, New Jersey 08903, United States
| | - Maria Sandoval
- Chemical and Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, P.O. Box 191, New Brunswick, New Jersey 08903, United States
| | - Richard Schild
- Chemical and Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, P.O. Box 191, New Brunswick, New Jersey 08903, United States
| | - Michelle Soltani
- Chemical and Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, P.O. Box 191, New Brunswick, New Jersey 08903, United States
| | - Anthony Tedesco
- Chemical and Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, P.O. Box 191, New Brunswick, New Jersey 08903, United States
| | - Dale Vanyo
- Chemical and Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, P.O. Box 191, New Brunswick, New Jersey 08903, United States
| | - Purushotham Vemishetti
- Chemical and Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, P.O. Box 191, New Brunswick, New Jersey 08903, United States
| | - Robert E. Waltermire
- Chemical and Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, P.O. Box 191, New Brunswick, New Jersey 08903, United States
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8
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Ručilová V, Maloň M, Soural M. Use of Triethylsilane for Directed Enantioselective Reduction of Olefines: Synthesis of Pyrazino[2,1-c
][1,4]oxazine-6,9-diones with Full Control of the Absolute Configuration. European J Org Chem 2018. [DOI: 10.1002/ejoc.201701553] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Veronika Ručilová
- Department of Organic Chemistry; Faculty of Science; Palacký University; 771 46 Olomouc Czech Republic
| | - Michal Maloň
- JEOL Ltd.; Musashino 3-1-2, Akishima 196-8558 Tokyo Japan
| | - Miroslav Soural
- Institute of Molecular and Translation Medicine; Faculty of Medicine and Dentistry; Palacký University; Hněvotínská 5 779 00 Olomouc Czech Republic
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9
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Cabrero-Antonino JR, Adam R, Junge K, Beller M. Cobalt-catalysed reductive C-H alkylation of indoles using carboxylic acids and molecular hydrogen. Chem Sci 2017; 8:6439-6450. [PMID: 29163930 PMCID: PMC5632795 DOI: 10.1039/c7sc02117h] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2017] [Accepted: 07/11/2017] [Indexed: 12/29/2022] Open
Abstract
The direct CH-alkylation of indoles using carboxylic acids is presented for the first time. The catalytic system based on the combination of Co(acac)3 and 1,1,1-tris(diphenylphosphinomethyl)-ethane (Triphos, L1), in the presence of Al(OTf)3 as co-catalyst, is able to perform the reductive alkylation of 2-methyl-1H-indole with a wide range of carboxylic acids. The utility of the protocol was further demonstrated through the C3 alkylation of several substituted indole derivatives using acetic, phenylacetic or diphenylacetic acids. In addition, a careful selection of the reaction conditions allowed to perform the selective C3 alkenylation of some indole derivatives. Moreover, the alkenylation of C2 position of 3-methyl-1H-indole was also possible. Control experiments indicate that the aldehyde, in situ formed from the carboxylic acid hydrogenation, plays a central role in the overall process. This new protocol enables the direct functionalization of indoles with readily available and stable carboxylic acids using a non-precious metal based catalyst and hydrogen as reductant.
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Affiliation(s)
- Jose R Cabrero-Antonino
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock , Albert-Einstein-Straße 29a , 18059 Rostock , Germany .
| | - Rosa Adam
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock , Albert-Einstein-Straße 29a , 18059 Rostock , Germany .
| | - Kathrin Junge
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock , Albert-Einstein-Straße 29a , 18059 Rostock , Germany .
| | - Matthias Beller
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock , Albert-Einstein-Straße 29a , 18059 Rostock , Germany .
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10
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Kilic H, Bayindir S, Erdogan E, Agopcan Cinar S, Konuklar FAS, Bali SK, Saracoglu N, Aviyente V. Bismuth nitrate-promoted disproportionative condensation of indoles with cyclohexanone: a new-type azafulvenium reactivity of indole. NEW J CHEM 2017. [DOI: 10.1039/c7nj01987d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The bismuth nitrate-promoted disproportionative condensation of indoles with cyclohexanone in one pot, to yield C3-cyclohexyl substituted indoles and 1,3-di(1H-indol-3-yl)benzene derivatives is reported for the first time.
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Affiliation(s)
- H. Kilic
- Department of Chemistry
- Faculty of Sciences
- Atatürk University
- Erzurum
- Turkey
| | - S. Bayindir
- Department of Chemistry
- Faculty of Sciences
- Atatürk University
- Erzurum
- Turkey
| | - E. Erdogan
- Department of Chemistry
- Faculty of Sciences
- Atatürk University
- Erzurum
- Turkey
| | - S. Agopcan Cinar
- Department of Chemistry
- Faculty of Arts and Sciences
- Boğaziçi University
- Istanbul
- Turkey
| | | | - S. K. Bali
- Department of Chemistry
- Faculty of Arts and Sciences
- Boğaziçi University
- Istanbul
- Turkey
| | - N. Saracoglu
- Department of Chemistry
- Faculty of Sciences
- Atatürk University
- Erzurum
- Turkey
| | - V. Aviyente
- Department of Chemistry
- Faculty of Arts and Sciences
- Boğaziçi University
- Istanbul
- Turkey
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11
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Nomiyama S, Hondo T, Tsuchimoto T. Easy Access to a Library of Alkylindoles: Reductive Alkylation of Indoles with Carbonyl Compounds and Hydrosilanes under Indium Catalysis. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201500502] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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12
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Wang L, Chen Y, Xiao J. Alkylideneindoleninium Ions and Alkylideneindolenines: Key Intermediates for the Asymmetric Synthesis of 3-Indolyl Derivatives. ASIAN J ORG CHEM 2014. [DOI: 10.1002/ajoc.201402093] [Citation(s) in RCA: 99] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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13
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A highly efficient route to C-3 alkyl-substituted indoles via a metal-free transfer hydrogenation. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.05.064] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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14
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Chen S, Liao Y, Zhao F, Qi H, Liu S, Deng GJ. Palladium-Catalyzed Direct Arylation of Indoles with Cyclohexanones. Org Lett 2014; 16:1618-21. [DOI: 10.1021/ol500231c] [Citation(s) in RCA: 82] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Shanping Chen
- Key
Laboratory of Environmentally Friendly Chemistry and Application of
Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, China
| | - Yunfeng Liao
- Key
Laboratory of Environmentally Friendly Chemistry and Application of
Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, China
- School of Chemistry & Chemical Engineering, Hunan Institute of Engineering, Xiangtan 411104, China
| | - Feng Zhao
- Key
Laboratory of Environmentally Friendly Chemistry and Application of
Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, China
| | - Hongrui Qi
- Key
Laboratory of Environmentally Friendly Chemistry and Application of
Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, China
| | - Saiwen Liu
- Key
Laboratory of Environmentally Friendly Chemistry and Application of
Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, China
| | - Guo-Jun Deng
- Key
Laboratory of Environmentally Friendly Chemistry and Application of
Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, China
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15
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Huchet QA, Kuhn B, Wagner B, Fischer H, Kansy M, Zimmerli D, Carreira EM, Müller K. On the polarity of partially fluorinated methyl groups. J Fluor Chem 2013. [DOI: 10.1016/j.jfluchem.2013.02.023] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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16
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Han X, Wu J. Redox Chain Reaction-Indole and Pyrrole Alkylation with Unactivated Secondary Alcohols. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201209810] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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17
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Han X, Wu J. Redox Chain Reaction-Indole and Pyrrole Alkylation with Unactivated Secondary Alcohols. Angew Chem Int Ed Engl 2013; 52:4637-40. [DOI: 10.1002/anie.201209810] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2012] [Revised: 02/05/2013] [Indexed: 11/10/2022]
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18
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Righi M, Topi F, Bartolucci S, Bedini A, Piersanti G, Spadoni G. Synthesis of tryptamine derivatives via a direct, one-pot reductive alkylation of indoles. J Org Chem 2012; 77:6351-7. [PMID: 22724919 DOI: 10.1021/jo3010028] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An efficient, one-pot reductive alkylation of indoles with N-protected aminoethyl acetals in the presence of TES/TFA is reported. It represents the first general method for the direct synthesis of tryptamine derivatives from indoles and nitrogen-functionalized acetals. This convergent and versatile approach employs safe and inexpensive reagents, proceeds under mild conditions, and tolerates several functional groups. The new procedure was efficiently applied to a gram-scale synthesis of both luzindole, a reference MT2-selective melatonin receptor antagonist, and melatonin.
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Affiliation(s)
- Marika Righi
- Department of Biomolecular Sciences, University of Urbino, Piazza Rinascimento 6, 61029 Urbino (PU), Italy
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19
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Cao LL, Wang DS, Jiang GF, Zhou YG. An efficient route to 2,3-disubstituted indoles via reductive alkylation using H2 as reductant. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.03.099] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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20
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Duan Y, Chen M, Ye Z, Wang D, Chen Q, Zhou Y. An Enantioselective Approach to 2,3‐Disubstituted Indolines through Consecutive Brønsted Acid/Pd‐Complex‐Promoted Tandem Reactions. Chemistry 2011; 17:7193-7. [DOI: 10.1002/chem.201100576] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2011] [Indexed: 11/11/2022]
Affiliation(s)
- Ying Duan
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences (CAS), 457 Zhongshan Road, Dalian 116023 (P.R. China), Fax: (+86) 411‐84379220
| | - Mu‐Wang Chen
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences (CAS), 457 Zhongshan Road, Dalian 116023 (P.R. China), Fax: (+86) 411‐84379220
| | - Zhi‐Shi Ye
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences (CAS), 457 Zhongshan Road, Dalian 116023 (P.R. China), Fax: (+86) 411‐84379220
| | - Duo‐Sheng Wang
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences (CAS), 457 Zhongshan Road, Dalian 116023 (P.R. China), Fax: (+86) 411‐84379220
| | - Qing‐An Chen
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences (CAS), 457 Zhongshan Road, Dalian 116023 (P.R. China), Fax: (+86) 411‐84379220
| | - Yong‐Gui Zhou
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences (CAS), 457 Zhongshan Road, Dalian 116023 (P.R. China), Fax: (+86) 411‐84379220
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21
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Tsuchimoto T, Kanbara M. Reductive Alkylation of Indoles with Alkynes and Hydrosilanes under Indium Catalysis. Org Lett 2011; 13:912-5. [DOI: 10.1021/ol1029673] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Teruhisa Tsuchimoto
- Department of Applied Chemistry, School of Science and Technology, Meiji University, Higashimita, Tama-ku, Kawasaki 214-8571, Japan
| | - Mitsutaka Kanbara
- Department of Applied Chemistry, School of Science and Technology, Meiji University, Higashimita, Tama-ku, Kawasaki 214-8571, Japan
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22
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Tsuchimoto T. Development of New Catalytic Reactions Based on Activation of Hydrocarbon Functional Groups by Lewis Acids. J SYN ORG CHEM JPN 2011. [DOI: 10.5059/yukigoseikyokaishi.69.889] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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23
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Shashikumar ND, Krishnamurthy GN, Rao K SR, Shridhara K, Naik HSB, Nagarajan K. An Improved Process for the Synthesis of 5-Bromo-3-(1-methylpiperidin-4-yl)-1H-indole: A Key Intermediate in the Synthesis of Naratriptan Hydrochloride. Org Process Res Dev 2010. [DOI: 10.1021/op100018r] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nellisara D. Shashikumar
- Department of Chemistry, Sahyadri Science College (Autonomous), Shimoga-577203, Karnataka, India, Alkem Laboratories Ltd., Bangalore-560058, Karnataka, India, and Department of Industrial Chemistry, Kuvempu University, Shimoga-577451, Karnataka, India
| | - Ganga Naika Krishnamurthy
- Department of Chemistry, Sahyadri Science College (Autonomous), Shimoga-577203, Karnataka, India, Alkem Laboratories Ltd., Bangalore-560058, Karnataka, India, and Department of Industrial Chemistry, Kuvempu University, Shimoga-577451, Karnataka, India
| | - Sundara Raj Rao K
- Department of Chemistry, Sahyadri Science College (Autonomous), Shimoga-577203, Karnataka, India, Alkem Laboratories Ltd., Bangalore-560058, Karnataka, India, and Department of Industrial Chemistry, Kuvempu University, Shimoga-577451, Karnataka, India
| | - Kanakamajalu Shridhara
- Department of Chemistry, Sahyadri Science College (Autonomous), Shimoga-577203, Karnataka, India, Alkem Laboratories Ltd., Bangalore-560058, Karnataka, India, and Department of Industrial Chemistry, Kuvempu University, Shimoga-577451, Karnataka, India
| | - Halehatti S. Bhojya Naik
- Department of Chemistry, Sahyadri Science College (Autonomous), Shimoga-577203, Karnataka, India, Alkem Laboratories Ltd., Bangalore-560058, Karnataka, India, and Department of Industrial Chemistry, Kuvempu University, Shimoga-577451, Karnataka, India
| | - Kuppuswamy Nagarajan
- Department of Chemistry, Sahyadri Science College (Autonomous), Shimoga-577203, Karnataka, India, Alkem Laboratories Ltd., Bangalore-560058, Karnataka, India, and Department of Industrial Chemistry, Kuvempu University, Shimoga-577451, Karnataka, India
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