1
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Inoue K, Mori A, Okano K. Formal Halogen Transfer of Bromoarenes via Stepwise Reactions. Org Lett 2023; 25:6693-6698. [PMID: 37646376 DOI: 10.1021/acs.orglett.3c02540] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
A two-step halogen transfer of bromoarenes is reported. Mono-, di-, and tribromoaryllithiums generated through deprotonative lithiation were converted into organozinc species by in situ zincation, which were then subjected to bromination to provide the corresponding di-, tri-, and tetrabromoarenes, respectively, in 41-95% yields. Regioselective bromine-magnesium exchange with ethylmagnesium chloride followed by electrophilic trapping afforded benzene, pyridine, quinoline, pyrimidine, and thiazole derivatives with the bromo group translocated from the original position in 28-86% yields.
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Affiliation(s)
- Kengo Inoue
- Department of Chemical Science and Engineering, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan
| | - Atsunori Mori
- Department of Chemical Science and Engineering, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan
- Research Center for Membrane and Film Technology, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan
| | - Kentaro Okano
- Department of Chemical Science and Engineering, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan
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2
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Chlupatý T, Růžičková Z, Kampová H, Merna J, Růžička A. Lithium, Magnesium, and Zinc Centers N,N'-Chelated by an Amine-Amide Hybrid Ligand. Inorg Chem 2022; 61:9392-9404. [PMID: 35706334 DOI: 10.1021/acs.inorgchem.1c03850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The synthesis and structure of lithium, magnesium, and zinc complexes N,N'-chelated by a hybrid amine-amido ligand ([2-(Me2NCH2)C6H4NR]-, abbreviated as LNR, where R = H, SiMe3, or Bn) are reported. The reaction of the least sterically demanding LNH with various magnesium sources gives the hexameric imide [LNMg]6 (4) by the elimination of n-butane from LNHMgnBu (2) or by the reaction of LNHLi (1) with MeMgBr. [LNH]2Mg (3) is obtained through the addition of 0.5 equiv of nBu2Mg or Mg[N(SiMe3)2]2 to LNH2 and with 1 equiv of nBu2Mg reacting to 2. Both LNHMgN(SiMe3)2 (6) and isostructural LNHZnN(SiMe3)2 (16) have been prepared using two different approaches: monodeprotonation of LNH2 by Zn/Mg[N(SiMe3)2]2 in a 1:1 ratio or ligand substitution of 2 or LNHZnEt (12) by 0.5 equiv of Sn[N(SiMe3)2]2. The reactions of 2 or 3 with 1 provide the heterotrimetallic complex [LNH]4Li2Mg (5). Benzyl- or trimethylsilyl-substituted anilines [LN(SiMe3)H (7) and LN(Bn)H (8)] with 0.5 equiv of nBu2Mg allow the formation of homoleptic bis(amides) of the [LN(R)]2Mg type (10 and 11). Nevertheless, only the silylated secondary amine 7 is able to provide the heteroleptic n-butylmagnesium amide LN(SiMe3)MgnBu (9) upon reaction with an equimolar amount of nBu2Mg. Similarly, 12, [LNH]2Zn (13), LN(R)ZnEt (17 and 18), and [LN(R)]2Zn [R = SiMe3 (19) and Bn (20)] were prepared by the monodeprotonation of LNH2 or LN(R)H using Et2Zn in the corresponding stoichiometric ratio. LNHZnI was prepared by the nucleophilic substitution of an ethyl chain in 12 by molecular iodine. A heterometallic complex, [LNH]4Li2Zn (14), analogous to 5 was prepared from 12 or 13 with 1 or 2 equiv of 1, respectively.
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Affiliation(s)
- Tomáš Chlupatý
- Faculty of Chemical Technology, Department of General and Inorganic Chemistry, University of Pardubice, Studentská 573, CZ-532 10 Pardubice, Czech Republic
| | - Zdeňka Růžičková
- Faculty of Chemical Technology, Department of General and Inorganic Chemistry, University of Pardubice, Studentská 573, CZ-532 10 Pardubice, Czech Republic
| | - Hana Kampová
- Faculty of Chemical Technology, Department of General and Inorganic Chemistry, University of Pardubice, Studentská 573, CZ-532 10 Pardubice, Czech Republic
| | - Jan Merna
- Faculty of Chemical Technology, Department of Polymers, University of Chemistry and Technology, Technická 5, CZ-166 28 Prague 6, Czech Republic
| | - Aleš Růžička
- Faculty of Chemical Technology, Department of General and Inorganic Chemistry, University of Pardubice, Studentská 573, CZ-532 10 Pardubice, Czech Republic
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3
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Sun Y, Li X, Yuan J, Yu J, Liu S. CuI-Catalyzed Regioselective Synthesis of 3-Arylcoumarins with Arylamines under Mild Conditions. CHINESE J ORG CHEM 2022. [DOI: 10.6023/cjoc202108050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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4
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Kobayashi A, Matsuzawa T, Hosoya T, Yoshida S. Thioxanthone Synthesis from Benzoic Acid Esters through Directed ortho-Lithiation. CHEM LETT 2021. [DOI: 10.1246/cl.210293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Akihiro Kobayashi
- Laboratory of Chemical Bioscience, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University (TMDU), 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan
- Department of Biological Science and Technology, Faculty of Advanced Engineering, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan
| | - Tsubasa Matsuzawa
- Laboratory of Chemical Bioscience, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University (TMDU), 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan
| | - Takamitsu Hosoya
- Laboratory of Chemical Bioscience, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University (TMDU), 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan
| | - Suguru Yoshida
- Department of Biological Science and Technology, Faculty of Advanced Engineering, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan
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5
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Nishimura RHV, Murie VE, Vessecchi R, Clososki GC. Selective Functionalization of Benzo‐Fused
N
‐Heterocycles by Using In Situ Trapping Metalations. ChemistrySelect 2020. [DOI: 10.1002/slct.202002589] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Rodolfo H. V. Nishimura
- Núcleo Pesquisas em Produtos Naturais e Sintéticos Departamento de Ciências BioMoleculares Faculdade de Ciências Farmacêuticas de Ribeirão Preto Universidade de São Paulo 14040-903 Ribeirão Preto-SP Brazil
- Departamento de Química Faculdade de Filosofia Ciências e Letras de Ribeirão Preto Universidade de São Paulo 14090-901 Ribeirão Preto- SP Brazil
| | - Valter E. Murie
- Núcleo Pesquisas em Produtos Naturais e Sintéticos Departamento de Ciências BioMoleculares Faculdade de Ciências Farmacêuticas de Ribeirão Preto Universidade de São Paulo 14040-903 Ribeirão Preto-SP Brazil
| | - Ricardo Vessecchi
- Departamento de Química Faculdade de Filosofia Ciências e Letras de Ribeirão Preto Universidade de São Paulo 14090-901 Ribeirão Preto- SP Brazil
| | - Giuliano C. Clososki
- Núcleo Pesquisas em Produtos Naturais e Sintéticos Departamento de Ciências BioMoleculares Faculdade de Ciências Farmacêuticas de Ribeirão Preto Universidade de São Paulo 14040-903 Ribeirão Preto-SP Brazil
- Departamento de Química Faculdade de Filosofia Ciências e Letras de Ribeirão Preto Universidade de São Paulo 14090-901 Ribeirão Preto- SP Brazil
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6
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Moazzam A, Jafarpour F. Chlorophyll-catalyzed photochemical regioselective coumarin C–H arylation with diazonium salts. NEW J CHEM 2020. [DOI: 10.1039/d0nj02012e] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A metal-free, direct C–H arylation of coumarins with aryl diazonium salts at room temperature using chlorophyll as a green photosensitizer is devised.
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Affiliation(s)
- Ali Moazzam
- School of Chemistry
- College of Science
- University of Tehran
- 14155-6455 Tehran
- Iran
| | - Farnaz Jafarpour
- School of Chemistry
- College of Science
- University of Tehran
- 14155-6455 Tehran
- Iran
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7
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Al-Zoubi RM, Al-Jammal WK, McDonald R. Regioselective synthesis of ortho-iodobiphenylboronic acid derivatives: a superior catalyst for carboxylic acid activation. NEW J CHEM 2020. [DOI: 10.1039/c9nj05708k] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Efficient and versatile synthesis of ortho-iodobiphenylboronic acids with remarkable catalytic and microbial activities.
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Affiliation(s)
- Raed M. Al-Zoubi
- Department of Chemistry
- Jordan University of Science and Technology
- Irbid
- Jordan
| | - Walid K. Al-Jammal
- Department of Chemistry
- Jordan University of Science and Technology
- Irbid
- Jordan
| | - Robert McDonald
- Department of Chemistry
- Gunning-Lemieux Chemistry Centre
- University of Alberta
- Edmonton
- Canada
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8
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Ragupathi A, Sagadevan A, Charpe VP, Lin CC, Hwu JR, Hwang KC. Visible-light-driven copper-catalyzed aerobic oxidative cascade cyclization of N-tosylhydrazones and terminal alkynes: regioselective synthesis of 3-arylcoumarins. Chem Commun (Camb) 2019; 55:5151-5154. [DOI: 10.1039/c9cc01801h] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
An intuitive visible-light-driven copper-catalyzed process can accomplish regioselective functionalized 3-arylcoumarins via oxidative annulation of simple N-tosylhydrazones with terminal alkynes under O2 (1 atm.) at room temperature.
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Affiliation(s)
| | | | | | - Chun-Cheng Lin
- Department of Chemistry
- National Tsing Hua University
- Hsinchu
- Republic of China
| | - Jih-Ru Hwu
- Department of Chemistry
- National Tsing Hua University
- Hsinchu
- Republic of China
| | - Kuo Chu Hwang
- Department of Chemistry
- National Tsing Hua University
- Hsinchu
- Republic of China
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9
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Chen CY, He F, Tang G, Yuan H, Li N, Wang J, Faessler R. Synthesis of Quinazolines via an Iron-Catalyzed Oxidative Amination of N–H Ketimines. J Org Chem 2018; 83:2395-2401. [PMID: 29341614 DOI: 10.1021/acs.joc.7b02943] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Cheng-yi Chen
- Janssen R&D, Pharmaceutical Development and Manufacturing Sciences, Small Molecule API Switzerland, Cilag AG, Hochstrasse 201, 8205 Schaffhausen, Switzerland
| | - Fengxian He
- Porton (Shanghai) R&D Center, 1299 Ziyue Road, Zizhu Science Park, Minhang District, Shanghai 200241, China
| | - Guangrong Tang
- Porton (Shanghai) R&D Center, 1299 Ziyue Road, Zizhu Science Park, Minhang District, Shanghai 200241, China
| | - Huiqing Yuan
- Porton (Shanghai) R&D Center, 1299 Ziyue Road, Zizhu Science Park, Minhang District, Shanghai 200241, China
| | - Ning Li
- Porton (Shanghai) R&D Center, 1299 Ziyue Road, Zizhu Science Park, Minhang District, Shanghai 200241, China
| | - Jinmin Wang
- Porton (Shanghai) R&D Center, 1299 Ziyue Road, Zizhu Science Park, Minhang District, Shanghai 200241, China
| | - Roger Faessler
- Janssen R&D, Pharmaceutical Development and Manufacturing Sciences, Small Molecule API Switzerland, Cilag AG, Hochstrasse 201, 8205 Schaffhausen, Switzerland
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10
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Murie VE, Nishimura RHV, Rolim LA, Vessecchi R, Lopes NP, Clososki GC. Base-Controlled Regioselective Functionalization of Chloro-Substituted Quinolines. J Org Chem 2018; 83:871-880. [PMID: 29240427 DOI: 10.1021/acs.joc.7b02855] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We prepared a number of di- and trifunctionalized quinolines by selective metalation of chloro-substituted quinolines with metal amides followed by reaction with different electrophiles. Metalation of the C-3 position of the quinolinic ring with lithium diisopropylamide at -70 °C is easy to achieve, whereas reaction with lithium-magnesium and lithium-zinc amides affords C-2 or C-8 functionalized derivatives in a regioselective fashion. These complementary methods could be rationalized by DFT calculations and are convenient strategies toward the synthesis of bioactive quinoline derivatives such as chloroquine analogues.
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Affiliation(s)
- Valter E Murie
- Núcleo de Pesquisas em Produtos Naturais e Sintéticos, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo , Av. do Café s/n, Ribeirão Preto, SP 14040-903, Brazil
| | - Rodolfo H V Nishimura
- Núcleo de Pesquisas em Produtos Naturais e Sintéticos, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo , Av. do Café s/n, Ribeirão Preto, SP 14040-903, Brazil.,Departamento de Química, Faculdade de Filosofia Ciências e Letras de Ribeirão Preto, Universidade de São Paulo , Av. Bandeirantes 3900, Ribeirão Preto, SP 14040-901, Brazil
| | - Larissa A Rolim
- Colegiado de Ciências Farmacêuticas, Universidade Federal do Vale do São Francisco , Av. José de Sá Maniçoba s/n, Petrolina, PE 56304-205, Brazil
| | - Ricardo Vessecchi
- Departamento de Química, Faculdade de Filosofia Ciências e Letras de Ribeirão Preto, Universidade de São Paulo , Av. Bandeirantes 3900, Ribeirão Preto, SP 14040-901, Brazil
| | - Norberto P Lopes
- Núcleo de Pesquisas em Produtos Naturais e Sintéticos, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo , Av. do Café s/n, Ribeirão Preto, SP 14040-903, Brazil
| | - Giuliano C Clososki
- Núcleo de Pesquisas em Produtos Naturais e Sintéticos, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo , Av. do Café s/n, Ribeirão Preto, SP 14040-903, Brazil.,Departamento de Química, Faculdade de Filosofia Ciências e Letras de Ribeirão Preto, Universidade de São Paulo , Av. Bandeirantes 3900, Ribeirão Preto, SP 14040-901, Brazil
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11
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Chevalier A, Ouahrouch A, Arnaud A, Gallavardin T, Franck X. An optimized procedure for direct access to 1H-indazole-3-carboxaldehyde derivatives by nitrosation of indoles. RSC Adv 2018; 8:13121-13128. [PMID: 35542511 PMCID: PMC9079728 DOI: 10.1039/c8ra01546e] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2018] [Accepted: 03/31/2018] [Indexed: 12/24/2022] Open
Abstract
The nitrosation of indoles under slightly acidic conditions and reverse addition conditions leads to the preparation of the corresponding indazole-3-carboxaldehydes in high yields and greatly minimizes side reactions.
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Affiliation(s)
- Arnaud Chevalier
- Normandie Univ
- CNRS
- UNIROUEN
- INSA Rouen
- COBRA (UMR 6014 and FR 3038)
| | | | - Alexandre Arnaud
- Normandie Univ
- CNRS
- UNIROUEN
- INSA Rouen
- COBRA (UMR 6014 and FR 3038)
| | | | - Xavier Franck
- Normandie Univ
- CNRS
- UNIROUEN
- INSA Rouen
- COBRA (UMR 6014 and FR 3038)
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12
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Zhang S, Niu YH, Ye XS. General Approach to Five-Membered Nitrogen Heteroaryl C-Glycosides Using a Palladium/Copper Cocatalyzed C–H Functionalization Strategy. Org Lett 2017; 19:3608-3611. [DOI: 10.1021/acs.orglett.7b01583] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Shuo Zhang
- State Key Laboratory of Natural and Biomimetic
Drugs, School of Pharmaceutical Sciences, Peking University, Xue Yuan Road No. 38, Beijing 100191, China
| | - You-Hong Niu
- State Key Laboratory of Natural and Biomimetic
Drugs, School of Pharmaceutical Sciences, Peking University, Xue Yuan Road No. 38, Beijing 100191, China
| | - Xin-Shan Ye
- State Key Laboratory of Natural and Biomimetic
Drugs, School of Pharmaceutical Sciences, Peking University, Xue Yuan Road No. 38, Beijing 100191, China
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13
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Abstract
Azines, which are six-membered aromatic compounds containing one or more nitrogen atoms, serve as ubiquitous structural cores of aromatic species with important applications in biological and materials sciences. Among a variety of synthetic approaches toward azines, C-H functionalization represents the most rapid and atom-economical transformation, and it is advantageous for the late-stage functionalization of azine-containing functional molecules. Since azines have several C-H bonds with different reactivities, the development of new reactions that allow for the functionalization of azines in a regioselective fashion has comprised a central issue. This review describes recent advances in the C-H functionalization of azines categorized as follows: (1) SNAr reactions, (2) radical reactions, (3) deprotonation/functionalization, and (4) metal-catalyzed reactions.
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Affiliation(s)
- Kei Murakami
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Graduate School of Science, and ‡JST-ERATO, Itami Molecular Nanocarbon Project, Nagoya University , Chikusa, Nagoya 464-8602, Japan
| | - Shuya Yamada
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Graduate School of Science, and ‡JST-ERATO, Itami Molecular Nanocarbon Project, Nagoya University , Chikusa, Nagoya 464-8602, Japan
| | - Takeshi Kaneda
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Graduate School of Science, and ‡JST-ERATO, Itami Molecular Nanocarbon Project, Nagoya University , Chikusa, Nagoya 464-8602, Japan
| | - Kenichiro Itami
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Graduate School of Science, and ‡JST-ERATO, Itami Molecular Nanocarbon Project, Nagoya University , Chikusa, Nagoya 464-8602, Japan
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14
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Yuan JW, Li WJ, Yang LR, Mao P, Xiao YM. Regioselective C-3 arylation of coumarins with arylhydrazines via radical oxidation by potassium permanganate. ACTA ACUST UNITED AC 2016. [DOI: 10.1515/znb-2016-0109] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Abstract
An efficient protocol for oxidative C-3 arylation of coumarins with arylhydrazine has been developed using potassium permanganate as an oxidant. The arylated coumarins with different electronic properties were obtained in moderate to good yields. The developed protocol for direct C-3 arylation of coumarins could be extended to quinolinones.
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Affiliation(s)
- Jin-Wei Yuan
- School of Chemistry and Chemical Engineering, Henan University of Technology; Academician Workstation for Natural Medical Chemistry of Henan Province, Zhengzhou 450001, P.R. China
| | - Wei-Jie Li
- School of Chemistry and Chemical Engineering, Henan University of Technology; Academician Workstation for Natural Medical Chemistry of Henan Province, Zhengzhou 450001, P.R. China
| | - Liang-Ru Yang
- School of Chemistry and Chemical Engineering, Henan University of Technology; Academician Workstation for Natural Medical Chemistry of Henan Province, Zhengzhou 450001, P.R. China
| | - Pu Mao
- School of Chemistry and Chemical Engineering, Henan University of Technology; Academician Workstation for Natural Medical Chemistry of Henan Province, Zhengzhou 450001, P.R. China
| | - Yong-Mei Xiao
- School of Chemistry and Chemical Engineering, Henan University of Technology; Academician Workstation for Natural Medical Chemistry of Henan Province, Zhengzhou 450001, P.R. China
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15
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Yuan JW, Yang LR, Yin QY, Mao P, Qu LB. KMnO4/AcOH-mediated C3-selective direct arylation of coumarins with arylboronic acids. RSC Adv 2016. [DOI: 10.1039/c6ra04787d] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
An efficient protocol for KMnO4/AcOH-mediated C3-direct radical arylation of coumarins with arylboronic acids to afford 3-arylcoumarin derivatives is described.
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Affiliation(s)
- Jin-Wei Yuan
- School of Chemistry & Chemical Engineering
- Henan University of Technology
- Zhengzhou 450001
- P.R. China
| | - Liang-Ru Yang
- School of Chemistry & Chemical Engineering
- Henan University of Technology
- Zhengzhou 450001
- P.R. China
| | - Qiu-Yue Yin
- School of Chemistry & Chemical Engineering
- Henan University of Technology
- Zhengzhou 450001
- P.R. China
| | - Pu Mao
- School of Chemistry & Chemical Engineering
- Henan University of Technology
- Zhengzhou 450001
- P.R. China
| | - Ling-Bo Qu
- School of Chemistry & Chemical Engineering
- Henan University of Technology
- Zhengzhou 450001
- P.R. China
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Liu J, Zhang X, Shi L, Liu M, Yue Y, Li F, Zhuo K. Base-promoted synthesis of coumarins from salicylaldehydes and aryl-substituted 1,1-dibromo-1-alkenes under transition-metal-free conditions. Chem Commun (Camb) 2014; 50:9887-90. [DOI: 10.1039/c4cc04377d] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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17
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Klatt T, Roman DS, León T, Knochel P. TMP-magnesium and TMP-zinc bases for the regioselective metalation of the cinnoline scaffold. Org Lett 2014; 16:1232-5. [PMID: 24512618 DOI: 10.1021/ol5001999] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A regioselective functionalization of cinnolines in positions 3 and 8 using metalations has been developed. This involves either the use of a frustrated Lewis pair consisting of BF3·Et2O and TMP2Mg·2LiCl or the in situ generated base TMP2Zn·2MgCl2·2LiCl. Successive metalations allow the preparation of 3,8-disubstituted cinnolines. Various functionalizations by acylation, allylation, and cross-coupling reactions with aryl halides or alkenyl iodides were carried out successfully.
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Affiliation(s)
- Thomas Klatt
- Department of Chemistry, Ludwig-Maximilians-University , Munich, Germany
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18
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Unsinn A, Wunderlich SH, Jana A, Karaghiosoff K, Knochel P. A convenient alumination of functionalized aromatics by using the frustrated Lewis pair Et3 Al and TMPMgCl⋅LiCl. Chemistry 2013; 19:14687-96. [PMID: 24027191 DOI: 10.1002/chem.201301869] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2013] [Indexed: 11/07/2022]
Abstract
A straightforward and efficient alumination of functionalized arenes by using the frustrated Lewis pair Et3 Al and TMPMgCl⋅LiCl (TMP=2,2,6,6-tetramethylpiperidyl) has been developed. In particular, halogenated electron-rich aromatics can be smoothly functionalized by using the frustrated Lewis pair Et3 Al and TMPMgCl⋅LiCl. Compared with previously described alumination methods, this procedure avoids extensive cooling and the need for an excess of base. This in situ procedure has proven to be most practical and allows for regio- and chemoselective metalation of a wide range of aromatics with sensitive functional groups (CONEt2 , CO2 Me, CN, OCONMe2 ) or halogens (F, Cl, Br, I). The resulting aromatic aluminates, which were characterized by using NMR spectroscopy, were subjected to allylations, acylations, and palladium-catalyzed cross-coupling reactions after transmetalation to zinc. It was shown that the nature of the Zn salt used for transmetalation is crucial. Thus, compared with ZnCl2 (2 equiv), the use of Zn(OPiv)2 (2 equiv; OPiv=pivalate) allows the subsequent quenching reactions to be performed with only a slight excess of electrophile (1.2 equiv) and provides interesting functionalized aromatics in good yields.
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Affiliation(s)
- Andreas Unsinn
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, Haus F, 81377 München (Germany), Fax: (+49) 89-2180-77680
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Unsinn A, Rohbogner CJ, Knochel P. Directed Magnesiation of Polyhaloaromatics using the Tetramethylpiperidylmagnesium Reagents TMP2Mg⋅2 LiCl and TMPMgCl⋅LiCl. Adv Synth Catal 2013. [DOI: 10.1002/adsc.201300185] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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