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Bandyopadhyay D, Thirupathi A, Radhakrishnan D, Panigrahi A, Peruncheralathan S. Triflic acid-mediated N-heteroannulation of β-anilino-β-(methylthio)acrylonitriles: a facile synthesis of 4-amino-2-(methylthio)quinolines. Org Biomol Chem 2021; 19:8544-8553. [PMID: 34550145 DOI: 10.1039/d1ob01151k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Various functionalised 4-amino-2-(methylthio)quinolines are synthesised through triflic acid-mediated N-heteroannulation of α-functionalized-β-anilino-β-(methylthio)acrylonitriles for the first time. The N-heteroannulation process is highly chemoselective and has mild reaction conditions. However, this process fails in the absence of the β-methylthio group in the acrylonitriles. In addition, a new double N-heteroannulation process is demonstrated to synthesise indolo[3,2-c]quinolines from non-heterocyclic precursors. Natural product isocryptolepine is synthesised in four steps from an acyclic precursor.
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Affiliation(s)
- Debashruti Bandyopadhyay
- School of Chemical Sciences, National Institute of Science Education and Research Bhubaneswar, HBNI, Jatani, Khurda-752050, Odisha, India.
| | - Annaram Thirupathi
- School of Chemical Sciences, National Institute of Science Education and Research Bhubaneswar, HBNI, Jatani, Khurda-752050, Odisha, India.
| | - Divya Radhakrishnan
- School of Chemical Sciences, National Institute of Science Education and Research Bhubaneswar, HBNI, Jatani, Khurda-752050, Odisha, India.
| | - Adyasha Panigrahi
- School of Chemical Sciences, National Institute of Science Education and Research Bhubaneswar, HBNI, Jatani, Khurda-752050, Odisha, India.
| | - S Peruncheralathan
- School of Chemical Sciences, National Institute of Science Education and Research Bhubaneswar, HBNI, Jatani, Khurda-752050, Odisha, India.
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2
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Otto CF, Herzberger C, Liu M, Namyslo JC, Nieger M, Freese T, Lederle F, Hübner EG, Schmidt A. Borane adducts of punicine and of its dehydroxy derivatives (pyridinium-1-yl)-2- and 3-phenolates. Tetrahedron 2020. [DOI: 10.1016/j.tet.2020.131627] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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3
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Delaude L. The Chemistry of Azolium‐Carboxylate Zwitterions and Related Compounds: a Survey of the Years 2009–2020. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000639] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Lionel Delaude
- Laboratory of CatalysisMolSys Research UnitInstitut de Chimie Organique (B6a)Université de Liège Allée du six Août 13 4000 Liège Belgium
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4
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Deev S, Batsyts S, Sheina E, Shestakova TS, Khalimbadzha I, Kiskin MA, Charushin V, Chupakhin O, Paramonov AS, Shenkarev ZO, Namyslo JC, Schmidt A. Betaine–N‐Heterocyclic Carbene Interconversions of Quinazolin‐4‐One Imidazolium Mesomeric Betaines. Sulfur, Selenium, and Borane Adduct Formation. European J Org Chem 2020. [DOI: 10.1002/ejoc.201901622] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Sergey Deev
- Ural Federal University 19 Mira Street 620002 Yekaterinburg Russia
| | - Sviatoslav Batsyts
- Institute of Organic Chemistry Clausthal University of Technology Leibnizstrasse 6 38678 Clausthal‐Zellerfeld Germany
| | - Ekaterina Sheina
- Ural Federal University 19 Mira Street 620002 Yekaterinburg Russia
| | | | | | - Mikhail A. Kiskin
- N. S. Kurnakov Institute of General and Inorganic Chemistry, RAS 31 Leninsky Av. 119991 Moscow Russia
| | - Valery Charushin
- Ural Federal University 19 Mira Street 620002 Yekaterinburg Russia
- E I. Ya. Postovsky Institute of Organic Synthesis Ural Branch of the Russian Academy of Sciences 22 S. Kovalevskoy Street 620219 Yekaterinburg Russia
| | - Oleg Chupakhin
- Ural Federal University 19 Mira Street 620002 Yekaterinburg Russia
- E I. Ya. Postovsky Institute of Organic Synthesis Ural Branch of the Russian Academy of Sciences 22 S. Kovalevskoy Street 620219 Yekaterinburg Russia
| | - Alexander S. Paramonov
- Shemyakin‐Ovchinnikov Institute of Bioorganic Chemistry Russian Academy of Sciences 16/10 Miklukho‐Maklaya Street 117997 Moscow Russia
| | - Zakhar O. Shenkarev
- Shemyakin‐Ovchinnikov Institute of Bioorganic Chemistry Russian Academy of Sciences 16/10 Miklukho‐Maklaya Street 117997 Moscow Russia
| | - Jan C. Namyslo
- Institute of Organic Chemistry Clausthal University of Technology Leibnizstrasse 6 38678 Clausthal‐Zellerfeld Germany
| | - Andreas Schmidt
- Institute of Organic Chemistry Clausthal University of Technology Leibnizstrasse 6 38678 Clausthal‐Zellerfeld Germany
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5
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Batsyts S, Hübner EG, Namyslo JC, Gjikaj M, Schmidt A. Synthesis and characterization of propeller-shaped mono- to hexacationic quinolinium-substituted benzenes. Org Biomol Chem 2019; 17:4102-4114. [PMID: 30964144 DOI: 10.1039/c9ob00357f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Diels-Alder reaction of 2-, 3- and 4-(phenylethynyl)quinolines and tetraphenylcyclopentadienone gave three regioisomeric 2,3,4,5,6-pentaphenyl-1-(quinolin-2-yl, -3-yl, and -4-yl)benzenes. Restricted rotation of the 3-yl and 4-yl substituted derivatives is observed between the central core and the substituents, resulting in propeller-shaped molecules. Likewise, 1,2-diquinolinyl-3,4,5,6-tetraphenylbenzenes with 3-yl,3-yl and 3-yl,4-yl connectivity were prepared. As evidenced by NMR spectroscopy, they form two diasteromers due to their restricted rotation. A cobalt-catalyzed [2 + 2 + 2]-cyclotrimerization of 2-(phenylethynyl)quinoline resulted in the formation of triphenyl-2,4,6- and -3,5,6-tri(quinolin-2-yl)benzenes. The same reaction was applied to 3,3'-ethyne-1,2-diyldiquinoline which formed hexa(quinolin-3-yl)benzene. N-Methylation gave the title compounds. Among those, the hexacationic hexa(N-methylquinolinio-3-yl)benzene is described. Stereochemical aspects are predominantly discussed by means of results of NMR experiments. DFT-calculations on the most stable conformations and the frontier orbital profiles of the hexacation as well as of its neutral precursor have been carried out.
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Affiliation(s)
- Sviatoslav Batsyts
- Clausthal University of Technology, Institute of Organic Chemistry, Leibnizstraße 6, D-38678 Clausthal-Zellerfeld, Germany.
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6
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Mari G, Favi G, Santeusanio S, Mantellini F, De Crescentini L. A practical and effective method for the N–N bond cleavage of N-amino-heterocycles. Org Chem Front 2019. [DOI: 10.1039/c9qo00895k] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An innovative, robust, regioselective, metal- and oxidant-free method to cleave the N–N bond of N-amino heterocycles, promoted by 1,2-diaza-1,3-dienes is here presented. The process involves a Michael type addition/E1cb elimination sequence.
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Affiliation(s)
- Giacomo Mari
- Department of Biomolecular Sciences
- Section of Chemistry and Pharmaceutical Technologies
- University of Urbino “Carlo Bo”
- 61029 Urbino (PU)
- Italy
| | - Gianfranco Favi
- Department of Biomolecular Sciences
- Section of Chemistry and Pharmaceutical Technologies
- University of Urbino “Carlo Bo”
- 61029 Urbino (PU)
- Italy
| | - Stefania Santeusanio
- Department of Biomolecular Sciences
- Section of Chemistry and Pharmaceutical Technologies
- University of Urbino “Carlo Bo”
- 61029 Urbino (PU)
- Italy
| | - Fabio Mantellini
- Department of Biomolecular Sciences
- Section of Chemistry and Pharmaceutical Technologies
- University of Urbino “Carlo Bo”
- 61029 Urbino (PU)
- Italy
| | - Lucia De Crescentini
- Department of Biomolecular Sciences
- Section of Chemistry and Pharmaceutical Technologies
- University of Urbino “Carlo Bo”
- 61029 Urbino (PU)
- Italy
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7
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Freese T, Namyslo JC, Nieger M, Schmidt A. Sulfur, mercury, and boron adducts of sydnone imine derived anionic N-heterocyclic carbenes. RSC Adv 2019; 9:4781-4788. [PMID: 35514659 PMCID: PMC9060589 DOI: 10.1039/c9ra00294d] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2019] [Accepted: 01/31/2019] [Indexed: 01/30/2023] Open
Abstract
The sydnone imines (5-benzoylimino)-3-(2-methoxyphenyl)-sydnone imine and molsidomine were deprotonated at C4 to give sydnone imine anions which can be represented as anionic N-heterocyclic carbenes, respectively. Trapping reactions with sulfur gave unstable sydnone imine sulfides which were stabilized by the formation of methyl thioethers, methyl sulfoxides, gold complexes [(PPh3)Au–S-sydnone imine] and a bis(ligand) mercury(ii) complex. The latter possesses a tetrahedral coordination of the mercury central atom to the sulfur atoms with the N6 nitrogen atoms coordinating as neutral ligands. Water converted the molsidomine anion into ethyl(2-morpholino-2-thioxoacetyl)carbamate. Mercury(ii)chloride and triphenylborane were employed to trap the sydnone imine carbenes as mercury complexes as well as BPh3 adducts. The sydnone imines (5-benzoylimino)-3-(2-methoxyphenyl)-sydnone imine and molsidomine were deprotonated at C4 to give sydnone imine anions which can be represented as anionic N-heterocyclic carbenes, respectively.![]()
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Affiliation(s)
- Tyll Freese
- Clausthal University of Technology
- Institute of Organic Chemistry
- Germany
| | - Jan C. Namyslo
- Clausthal University of Technology
- Institute of Organic Chemistry
- Germany
| | - Martin Nieger
- Department of Chemistry
- University of Helsinki
- Finland
| | - Andreas Schmidt
- Clausthal University of Technology
- Institute of Organic Chemistry
- Germany
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8
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Chen Q, Mao Z, Gao K, Guo F, Sheng L, Chen Z. Synthesis of 1,2-Dihydroquinazolines via Rearrangement of Indazolium Salts. J Org Chem 2018; 83:8750-8758. [PMID: 30011991 DOI: 10.1021/acs.joc.8b01044] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A convenient synthesis of 1,2-dihydroquinazolines via rearrangement of indazolium salts was described. A mechanistic study using isotope labeling experiment revealed that the rearrangement passes through cleavage of N-N bond/ring opening after basic deprotonation of 2-benzyl in indazolium salts to yield intermediate E, which proceeds in an intramolecular N-nucleophilic addition to form the observed product. Computational analyses imply that the pathway of the rearrangement is determined by the energy barriers of the ring-closing process and the stability of the product.
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Affiliation(s)
- Qian Chen
- School of Chemical Engineering , Southwest Forestry University , Kunming 650224 , China.,School of Chemistry and Chemical Engineering , Harbin Institute of Technology , Harbin 150080 , China
| | - Zhuqing Mao
- School of Chemistry and Chemical Engineering , Harbin Institute of Technology , Harbin 150080 , China
| | - Kunqi Gao
- School of Chemistry and Chemical Engineering , Harbin Institute of Technology , Harbin 150080 , China
| | - Fang Guo
- School of Chemistry and Chemical Engineering , Harbin Institute of Technology , Harbin 150080 , China
| | - Li Sheng
- School of Chemistry and Chemical Engineering , Harbin Institute of Technology , Harbin 150080 , China
| | - Zhonglin Chen
- State Key Laboratory of Urban Water Resource and Environment, School of Environment , Harbin Institute of Technology , Harbin 150090 , China
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9
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Zhou Y, Song Q. Oxidative ring-opening of 3-aminoindazoles for the synthesis of 2-aminobenzoates. Org Chem Front 2018. [DOI: 10.1039/c8qo00872h] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
A novel oxidative ring-opening of 3-aminoindazoles based on N–N bond cleavage was developed, in which various 2-aminobenzoates were obtained in good yields under mild conditions.
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Affiliation(s)
- Yao Zhou
- Institute of Next Generation Matter Transformation
- College of Chemical Engineering at Huaqiao University
- Xiamen
- P. R. China
| | - Qiuling Song
- Institute of Next Generation Matter Transformation
- College of Chemical Engineering at Huaqiao University
- Xiamen
- P. R. China
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10
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Zhang L, Han YF. A macrocyclic silver polycarbene complex based on 1,2,4-triazole units: synthesis and postsynthetic modification. Dalton Trans 2018; 47:4267-4272. [DOI: 10.1039/c8dt00169c] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A method for the synthesis of a new rectangular 1,2,4-triazole-containing macrocycle via photochemical [2 + 2] cycloaddition with a metal–carbene template was developed.
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Affiliation(s)
- Le Zhang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education
- College of Chemistry and Materials Science
- FM & EM International Joint Laboratory
- Northwest University
- Xi'an 710127
| | - Ying-Feng Han
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education
- College of Chemistry and Materials Science
- FM & EM International Joint Laboratory
- Northwest University
- Xi'an 710127
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11
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Schmidt A, C. Namyslo J, Lennart Ahlburg N, Doppleb O, Hillrichs K, G. Hübner E. Deprotonation of 4-Ethynylpyrazolium Salts. HETEROCYCLES 2018. [DOI: 10.3987/com-18-13916] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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12
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Kumar T, Mane V, Namboothiri INN. Synthesis of Aminophenanthrenes and Benzoquinolines via Hauser–Kraus Annulation of Sulfonyl Phthalide with Rauhut–Currier Adducts of Nitroalkenes. Org Lett 2017; 19:4283-4286. [DOI: 10.1021/acs.orglett.7b01924] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tarun Kumar
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai 400 076, India
| | - Vaijinath Mane
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai 400 076, India
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13
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Chen Q, Liu X, Guo F, Chen Z. An unexpected rearrangement of pyrazolium halides based on N–N bond cleavage: synthesis of 1,2-dihydropyrimidines. Chem Commun (Camb) 2017; 53:6792-6795. [DOI: 10.1039/c7cc02525d] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An unexpected rearrangement of pyrazolium halides was observed, presenting an efficient approach for the synthesis of 1,2-dihydroquinazolines under mild conditions.
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Affiliation(s)
- Qian Chen
- State Key Laboratory of Urban Water Resource and Environment
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage
- School of Chemistry and Chemical Engineering
- Harbin Institute of Technology
- Harbin
| | - Xiaoshuang Liu
- State Key Laboratory of Urban Water Resource and Environment
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage
- School of Chemistry and Chemical Engineering
- Harbin Institute of Technology
- Harbin
| | - Fang Guo
- State Key Laboratory of Urban Water Resource and Environment
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage
- School of Chemistry and Chemical Engineering
- Harbin Institute of Technology
- Harbin
| | - Zhonglin Chen
- School of Municipal Environmental Engineering
- Harbin Institute of Technology
- Harbin
- China
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14
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The intersection of allenylidenes and mesomeric betaines. 1-Methylpyridinium-2-acetylide and its palladium complexes. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.10.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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15
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16
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Vidyacharan S, Sagar A, Sharada DS. A new route for the synthesis of highly substituted 4-aminoquinoline drug like molecules via aza hetero–Diels–Alder reaction. Org Biomol Chem 2015; 13:7614-8. [DOI: 10.1039/c5ob01023c] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
A new route has been developed for the synthesis of 4-aminoquinoline drug like moleculesviaaza hetero–Diels–Alder reaction starting from 2H-indazole as a diene for the first time.
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Affiliation(s)
- Shinde Vidyacharan
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- Telangana
- Hyderabad
- India
| | - A. Sagar
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- Telangana
- Hyderabad
- India
| | - Duddu S. Sharada
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- Telangana
- Hyderabad
- India
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Liu M, Nieger M, Schmidt A. Mesomeric betaine – N-heterocyclic carbene interconversions of 1,2,4-triazolium-phenolates. Sulfur, selenium, and borane adduct formation. Chem Commun (Camb) 2015; 51:477-9. [DOI: 10.1039/c4cc08032g] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Triazolium-phenolates form carbenic tautomers which can be trapped with boranes as a new heterocyclic ring system.
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Affiliation(s)
- Ming Liu
- Clausthal University of Technology
- Institute of Organic Chemistry
- D-38678 Clausthal-Zellerfeld
- Germany
| | - Martin Nieger
- Laboratory of Inorganic Chemistry
- Department of Chemistry
- University of Helsinki
- FIN-00014 Helsinki
- Finland
| | - Andreas Schmidt
- Clausthal University of Technology
- Institute of Organic Chemistry
- D-38678 Clausthal-Zellerfeld
- Germany
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Zhang J, Pidlypnyi N, Nieger M, Namyslo JC, Schmidt A. Zwitterionic borane adducts of N-heterocyclic carbenes from mesomeric betaines of uracil. Org Biomol Chem 2014; 12:2737-44. [PMID: 24658502 DOI: 10.1039/c3ob42462f] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Imidazolium-substituted uracil-anions are in equilibrium with their N-heterocyclic carbenes which can be trapped as cyclic borane adducts.
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Affiliation(s)
- Jiaxi Zhang
- Clausthal University of Technology
- Institute of Organic Chemistry
- D-38678 Clausthal-Zellerfeld, Germany
| | - Nazar Pidlypnyi
- Clausthal University of Technology
- Institute of Organic Chemistry
- D-38678 Clausthal-Zellerfeld, Germany
| | - Martin Nieger
- Laboratory of Inorganic Chemistry
- Department of Chemistry
- University of Helsinki
- , Finland
| | - Jan C. Namyslo
- Clausthal University of Technology
- Institute of Organic Chemistry
- D-38678 Clausthal-Zellerfeld, Germany
| | - Andreas Schmidt
- Clausthal University of Technology
- Institute of Organic Chemistry
- D-38678 Clausthal-Zellerfeld, Germany
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Pidlypnyi N, Uhrner F, Nieger M, Drafz MHH, Hübner EG, Namyslo JC, Schmidt A. N-Heterocyclic Carbene-Betaine Interconversions: Tautomeric Equilibria of Imidazolium-Indolates and Indole-Substituted Imidazol-2-ylidenes. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300728] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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20
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Cheng G, Cui X. Efficient Approach to 4-Sulfonamidoquinolines via Copper(I)-Catalyzed Cascade Reaction of Sulfonyl Azides with Alkynyl Imines. Org Lett 2013; 15:1480-3. [DOI: 10.1021/ol400219n] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Guolin Cheng
- Engineering Research Center of Molecular Medicine, Ministry of Education, Key Laboratory of Xiamen Marine and Gene Drugs, Institutes of Molecular Medicine and School of Biomedical Sciences, Huaqiao University, Xiamen 361021, P. R. China
| | - Xiuling Cui
- Engineering Research Center of Molecular Medicine, Ministry of Education, Key Laboratory of Xiamen Marine and Gene Drugs, Institutes of Molecular Medicine and School of Biomedical Sciences, Huaqiao University, Xiamen 361021, P. R. China
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Guan Z, Wiechmann S, Drafz M, Hübner E, Schmidt A. Pericyclic rearrangements of N-heterocyclic carbenes of indazole to substituted 9-aminoacridines. Org Biomol Chem 2013; 11:3558-67. [PMID: 23613125 DOI: 10.1039/c3ob40379c] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Zong Guan
- Clausthal University of Technology, Institute of Organic Chemistry, Leibnizstrasse 6, D-38678 Clausthal-Zellerfeld, Germany
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Duda B, Tverdomed SN, Ionin BI, Röschenthaler GV. Base-Promoted Heterocyclization of Fluorinated Alkynylphosphonates with Select ortho-Aminobenzonitriles. European J Org Chem 2012. [DOI: 10.1002/ejoc.201200379] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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23
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Rahimi A, Pápai I, Madarász Á, Gjikaj M, Namyslo JC, Schmidt A. A Cyclobutene-1,2-bis(imidazolium) Salt as Preligand for Palladium-Catalyzed Cross-Coupling Reactions: Properties and Applications. European J Org Chem 2011. [DOI: 10.1002/ejoc.201101378] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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24
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Rahimi A, Namyslo JC, Drafz MHH, Halm J, Hübner E, Nieger M, Rautzenberg N, Schmidt A. Selective mono- to perarylations of tetrabromothiophene by a cyclobutene-1,2-diylbisimidazolium preligand. J Org Chem 2011; 76:7316-25. [PMID: 21842887 DOI: 10.1021/jo201317t] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
(Cyclobut-1-ene-1,2-diyl)bis(1-methylimidazolium)tetrafluoroborate is applied as preligand in palladium-catalyzed cross-coupling reactions starting from tetrabromothiophene for the synthesis of mono-, bi-, tri-, and tetraaryl-substituted thiophenes bearing up to four different aryl rings. A synthetic kit for preparations of nine different substitution patterns of arylated thiophenes is presented by application of only one single catalyst system. In agreement with DFT calculations, which predict energetically low rotational barriers in triaryl-3-bromothiophenes and tetraarylthiophenes, no NOE effects between adjacent aryl rings are detectable. The regioselectivity of their syntheses has therefore been elucidated by reduction of triaryl-3-bromothiophene to 2,3,5-triarylthiophene followed by HMBC, HSQC, and NOESY NMR measurements. Additionally, results of an X-ray single structure analysis are presented.
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Affiliation(s)
- Alireza Rahimi
- Institute of Organic Chemistry, Clausthal University of Technology, Leibnizstrasse 6, D-38678 Clausthal-Zellerfeld, Germany
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