1
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Inorganic salt-conditioning preparation of a copper (II) ions-doped thin film composite membrane with ridge-valley morphology for efficient organic solvent nanofiltration. Colloids Surf A Physicochem Eng Asp 2023. [DOI: 10.1016/j.colsurfa.2023.131114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
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2
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Kumbhar VV, Khairnar BB, Chaskar MG, Pawar RA, Gugale GS. Synthetic strategies in development of 3-aroylimidazo[1,2-a]pyridines and 2-aroylimidazo[1,2-a]pyridines: A decade update. SYNTHETIC COMMUN 2022. [DOI: 10.1080/00397911.2022.2056057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Vikrant V. Kumbhar
- Department of Chemistry, PDEA’s Prof. Ramkrishna More College, Pune, India
- Interdisciplinary School of Science (IDSS), Savitribai Phule Pune University, Pune, India
| | - Bhushan B. Khairnar
- Department of Chemistry, PDEA’s Prof. Ramkrishna More College, Pune, India
- Interdisciplinary School of Science (IDSS), Savitribai Phule Pune University, Pune, India
| | - Manohar G. Chaskar
- Department of Chemistry, PDEA’s Prof. Ramkrishna More College, Pune, India
| | - Ramdas A. Pawar
- Department of Chemistry, PDEA’s Prof. Ramkrishna More College, Pune, India
| | - Gulab S. Gugale
- Department of Chemistry, PDEA’s Prof. Ramkrishna More College, Pune, India
- Department of Chemistry, Haribhai V. Desai College, Pune, India
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3
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Ghosh P, Samanta S, Ghosh S, Jana S, Hajra A. Aminomethylation of imidazopyridines using N,N-dimethylformamide as an aminomethylating reagent under Cu(II)-catalysis. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.152581] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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4
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Samanta S, Ghosh AK, Ghosh S, Ilina AA, Volkova YA, Zavarzin IV, Scherbakov AM, Salnikova DI, Dzichenka YU, Sachenko AB, Shirinian VZ, Hajra A. Fe(iii)-Catalyzed synthesis of steroidal imidazoheterocycles as potent antiproliferative agents. Org Biomol Chem 2020; 18:5571-5576. [PMID: 32662797 DOI: 10.1039/d0ob01241f] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
An efficient and practical method has been developed for the synthesis of steroidal imidazoheterocycles via cost-effective and environmentally benign FeCl3-catalyzed oxidative amination. A library of steroidal imidazo[1,2-a]pyridines was directly synthesized from readily available 2-aminopyridines and steroidal ketones in aerobic conditions. The synthesized compounds were screened for activity on human microsomal cytochrome P450s CYP7, CYP17 and CYP21. Antiproliferative activity of two lead compounds 3ia and 3la was additionally evaluated against the human MCF-7 (breast cancer), SKOV3 (ovarian cancer), and 22Rv1 (prostate cancer) cell lines. Steroidal imidazo[1,2-a]pyridine 3la which is a substrate molecule for CYP17A1 with IC50 = 1.7 μM (MCF-7), 3.0 (SKOV3), and 6.0 μM (22Rv1) has proved to be more active than reference drug cisplatin.
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Affiliation(s)
- Sadhanendu Samanta
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, West Bengal, India.
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5
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Wang T, Chen G, Lu Y, Chen Q, Huo Y, Li X. Intermolecular Multiple Dehydrogenative Cross‐Couplings of Ketones with Boronic Acids and Amines via Copper Catalysis. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900419] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Tianzhang Wang
- School of Chemical Engineering and Light IndustryGuangdong University of Technology Guangzhou 510006 People's Republic of China
| | - Guowei Chen
- School of Chemical Engineering and Light IndustryGuangdong University of Technology Guangzhou 510006 People's Republic of China
| | - Yu‐Jing Lu
- School of Biomedical and Pharmaceutical SciencesGuangdong University of Technology Guangzhou 510006 People's Republic of China
| | - Qian Chen
- School of Chemical Engineering and Light IndustryGuangdong University of Technology Guangzhou 510006 People's Republic of China
| | - Yanping Huo
- School of Chemical Engineering and Light IndustryGuangdong University of Technology Guangzhou 510006 People's Republic of China
| | - Xianwei Li
- School of Chemical Engineering and Light IndustryGuangdong University of Technology Guangzhou 510006 People's Republic of China
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6
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Kibriya G, Bagdi AK, Hajra A. Visible light induced tetramethylethylenediamine assisted formylation of imidazopyridines. Org Biomol Chem 2018; 16:3473-3478. [DOI: 10.1039/c8ob00532j] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A metal-free visible light induced C-3 formylation of imidazo[1,2-a]pyridine has been developed using tetramethylethylenediamine (TMEDA) as a one carbon source under ambient air.
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Affiliation(s)
- Golam Kibriya
- Department of Chemistry
- Visva-Bharati (A Central University)
- Santiniketan 731235
- India
| | - Avik K. Bagdi
- Department of Chemistry
- TDB College
- Paschim Bardhaman 713347
- India
| | - Alakananda Hajra
- Department of Chemistry
- Visva-Bharati (A Central University)
- Santiniketan 731235
- India
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7
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Jana S, Samanta S, Bagdi AK, Shirinian VZ, Hajra A. Metal-free C–H arylation of imidazoheterocycles with aryl hydrazines. RSC Adv 2018; 8:12360-12367. [PMID: 35539413 PMCID: PMC9079221 DOI: 10.1039/c8ra01474d] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Accepted: 03/19/2018] [Indexed: 12/23/2022] Open
Abstract
Metal-free C–H arylation of imidazo[1,2-a]pyridines at C-3 position with arylhydrazines in presence of DBU has been developed at room temperature under ambient air.
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Affiliation(s)
- Sourav Jana
- Department of Chemistry
- Visva-Bharati (A Central University) Santiniketan
- India
| | - Sadhanendu Samanta
- Department of Chemistry
- Visva-Bharati (A Central University) Santiniketan
- India
| | - Avik K. Bagdi
- Department of Chemistry
- TDB College
- Burdwan 713347
- India
| | | | - Alakananda Hajra
- Department of Chemistry
- Visva-Bharati (A Central University) Santiniketan
- India
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8
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Wan JP, Hu D, Liu Y, Li L, Wen C. Copper-catalyzed intramolecular oxidative amination of enaminone C–H bond for the synthesis of imidazo[1,2- a ]pyridines. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.05.064] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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9
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Affiliation(s)
- Lin Zhang
- Department of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Jinhuan Dong
- Department of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Xianxiu Xu
- Department of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Qun Liu
- Department of Chemistry, Northeast Normal University, Changchun 130024, China
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10
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Rassokhina IV, Shirinian VZ, Zavarzin IV, Gevorgyan V, Volkova YA. Copper(II)-Mediated Aerobic Synthesis of Imidazo[1,2-a]pyridines via Cascade Aminomethylation/Cycloisomerization of Alkynes. J Org Chem 2015; 80:11212-8. [DOI: 10.1021/acs.joc.5b02102] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Irina V. Rassokhina
- N.
D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 119991 Moscow, Russia
| | - Valerii Z. Shirinian
- N.
D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 119991 Moscow, Russia
| | - Igor V. Zavarzin
- N.
D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 119991 Moscow, Russia
| | - Vladimir Gevorgyan
- Department
of Chemistry, University of Illinois at Chicago, 845 West Taylor
Street, Room 4500, Chicago, Illinois 60607, United States
| | - Yulia A. Volkova
- N.
D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 119991 Moscow, Russia
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11
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Gogoi A, Guin S, Rajamanickam S, Rout SK, Patel BK. Synthesis of 1,2,4-Triazoles via Oxidative Heterocyclization: Selective C–N Bond Over C–S Bond Formation. J Org Chem 2015; 80:9016-27. [DOI: 10.1021/acs.joc.5b00956] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Anupal Gogoi
- Department
of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
| | - Srimanta Guin
- Department
of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
| | - Suresh Rajamanickam
- Department
of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
| | - Saroj Kumar Rout
- Department
of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
| | - Bhisma K. Patel
- Department
of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
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12
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Outlaw VK, d’Andrea FB, Townsend CA. One-pot synthesis of highly substituted N-fused heteroaromatic bicycles from azole aldehydes. Org Lett 2015; 17:1822-5. [PMID: 25815402 PMCID: PMC4500639 DOI: 10.1021/ol5036936] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An efficient route to substituted N-fused aromatic heterocycles, including indolizines, imidazo[1,2-a]pyridines, and imidazo[1,5-a]pyridines from azole aldehydes, is reported. Wittig olefination of the aldehydes with fumaronitrile and triethylphosphine affords predominantly E-alkenes that undergo rapid cyclization upon treatment with a mild base. Substituent control of the 1-, 2-, and 3-positions of the resulting heteroaromatic bicycles is shown. Alternatively, the isolable E-alkene undergoes selective alkylation with electrophiles, followed by in situ annulation to indolizines additionally substituted at the 6-position.
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Affiliation(s)
- Victor K. Outlaw
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Felipe B. d’Andrea
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Craig A. Townsend
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
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13
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Reddy KR, Reddy AS, Shankar R, Kant R, Das P. Copper-Catalyzed Oxidative C−H Amination: Synthesis of Imidazo[1,2-a]-N-Heterocycles from N-Heteroaryl Enaminones. ASIAN J ORG CHEM 2015. [DOI: 10.1002/ajoc.201500052] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- K. Ranjith Reddy
- Academy of Scientific and Innovative Research (AcSIR), New Delhi; Department of Medicinal Chemistry; Indian Institute of Integrative Medicine; Canal Road Jammu 180001 India
| | - A. Siva Reddy
- Academy of Scientific and Innovative Research (AcSIR), New Delhi; Department of Medicinal Chemistry; Indian Institute of Integrative Medicine; Canal Road Jammu 180001 India
| | - Ravi Shankar
- Academy of Scientific and Innovative Research (AcSIR), New Delhi; Department of Medicinal Chemistry; Indian Institute of Integrative Medicine; Canal Road Jammu 180001 India
| | - Rajni Kant
- Post-Graduate Department of Physics & Electronics; University of Jammu; Jammu 180006 India
| | - Parthasarathi Das
- Academy of Scientific and Innovative Research (AcSIR), New Delhi; Department of Medicinal Chemistry; Indian Institute of Integrative Medicine; Canal Road Jammu 180001 India
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14
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Sharma P, Liu RS. Cu-Catalyzed Aerobic Oxidative Cyclizations of 3-N-Hydroxyamino-1,2-propadienes with Alcohols, Thiols, and Amines To Form α-O-,S-, andN-Substituted 4-Methylquinoline Derivatives. Chemistry 2015; 21:4590-4. [DOI: 10.1002/chem.201406317] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Indexed: 12/11/2022]
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15
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Kaswan P, Pericherla K, Rajnikant, Kumar A. Synthesis of 3-aroylimidazo[1,2-a]pyridines via CuCl2 catalyzed tandem dual carbon–nitrogen bonding. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.09.067] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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16
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Yan H, Wang Y, Pan C, Zhang H, Yang S, Ren X, Li J, Huang G. Iron(III)-Catalyzed Denitration Reaction: One-Pot Three-Component Synthesis of Imidazo[1,2-a]pyridine Derivatives. European J Org Chem 2014. [DOI: 10.1002/ejoc.201301658] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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17
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Yu GN, Xia JH, Xu ZH, Wang LB, Yu CY. 3,3-Bis(methyl-sulfan-yl)-1-(4-nitro-phen-yl)prop-2-en-1-one. Acta Crystallogr Sect E Struct Rep Online 2013; 69:o1036. [PMID: 24046613 PMCID: PMC3772470 DOI: 10.1107/s1600536813014542] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2013] [Accepted: 05/27/2013] [Indexed: 11/24/2022]
Abstract
In the title compound, C11H11NO3S2, the S—Csp2 bonds are shorter [1.746 (3) and 1.750 (2) Å] than the S—CH3 bonds [1.794 (3) and 1.806 (3) Å], which we attribute to d–π interactions between the S atoms and the C=C bond. The 1,1-bis(methylsulfanyl)-3-oxopropylene fragment and the 4-nitrophenyl group are both almost planar, with the largest deviations from their mean planes being 0.053 (1) and 0.017 (2) Å, respectively. The dihedral angle between the two planes is 35.07 (7)°. Molecules in the crystal are linked into a three-dimensional network by C—H⋯S and C—H⋯O hydrogen bonds.
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Affiliation(s)
- Guan-Neng Yu
- College of Chemistry and Chemical Engineering, Jiang Xi Normal University, Nanchang, Jiang Xi 330022, People's Republic of China
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18
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Cai ZJ, Wang SY, Ji SJ. Copper(I) Iodide/Boron Trifluoride Etherate-Cocatalyzed Aerobic Dehydrogenative Reactions Applied in the Synthesis of Substituted Heteroaromatic Imidazo[1,2-a]pyridines. Adv Synth Catal 2013. [DOI: 10.1002/adsc.201300333] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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19
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Chandra Mohan D, Reddy Donthiri R, Nageswara Rao S, Adimurthy S. Copper(I) Iodide-Catalysed Aerobic Oxidative Synthesis of Imidazo[1,2-a]pyridines from 2-Aminopyridines and Methyl Ketones. Adv Synth Catal 2013. [DOI: 10.1002/adsc.201300456] [Citation(s) in RCA: 100] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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20
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Synthesis of some new α,α-dioxoketene-N,S- and -N,N-acetals derived from secondary aliphatic amines. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2013. [DOI: 10.1007/s13738-013-0226-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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21
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Wang JW, Ge YQ, Zhao WJ, Xie YF, Xu WR, Zhao GL. Facile Synthesis of Pyrido[1,2-a]benzimidazole Derivatives via Novel Tandem Reaction Involing Horner-Emmons Reaction. HETEROCYCLES 2013. [DOI: 10.3987/com-13-12712] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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22
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Li X. Cu(I)-Catalysed Oxidative Coupling of 2-Aminopyridines with β-Keto Esters: Synthesis of Imidazo[1,2-a]Pyridine-3-Carboxylates. JOURNAL OF CHEMICAL RESEARCH 2012. [DOI: 10.3184/174751912x13415906694258] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A simple, economical, and environmentally friendly copper-catalysed direct oxidative C–N coupling of 2-aminopyridines with β-keto esters using air as oxidation agent for the creation of imidazo[1,2- a]pyridine-3-carboxylates is demonstrated. Imidazo[1,2- a]pyridine is the basic skeleton for a wide range of biological and pharmacological compounds.
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Affiliation(s)
- Xiaoqing Li
- College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310014, P. R. China
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23
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Yan RL, Yan H, Ma C, Ren ZY, Gao XA, Huang GS, Liang YM. Cu(I)-Catalyzed Synthesis of Imidazo[1,2-a]pyridines from Aminopyridines and Nitroolefins Using Air as the Oxidant. J Org Chem 2012; 77:2024-8. [DOI: 10.1021/jo202447p] [Citation(s) in RCA: 171] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Ru-Long Yan
- State Key Laboratory of Applied Organic
Chemistry, Lanzhou University, Key Laboratory
of Nonferrous Metal
Chemistry and Resources Utilization of Gansu Province, Lanzhou 730000,
P. R. of China
| | - Hao Yan
- State Key Laboratory of Applied Organic
Chemistry, Lanzhou University, Key Laboratory
of Nonferrous Metal
Chemistry and Resources Utilization of Gansu Province, Lanzhou 730000,
P. R. of China
| | - Chao Ma
- State Key Laboratory of Applied Organic
Chemistry, Lanzhou University, Key Laboratory
of Nonferrous Metal
Chemistry and Resources Utilization of Gansu Province, Lanzhou 730000,
P. R. of China
| | - Zhi-Yong Ren
- State Key Laboratory of Applied Organic
Chemistry, Lanzhou University, Key Laboratory
of Nonferrous Metal
Chemistry and Resources Utilization of Gansu Province, Lanzhou 730000,
P. R. of China
| | - Xi-Ai Gao
- State Key Laboratory of Applied Organic
Chemistry, Lanzhou University, Key Laboratory
of Nonferrous Metal
Chemistry and Resources Utilization of Gansu Province, Lanzhou 730000,
P. R. of China
| | - Guo-Sheng Huang
- State Key Laboratory of Applied Organic
Chemistry, Lanzhou University, Key Laboratory
of Nonferrous Metal
Chemistry and Resources Utilization of Gansu Province, Lanzhou 730000,
P. R. of China
| | - Yong-Min Liang
- State Key Laboratory of Applied Organic
Chemistry, Lanzhou University, Key Laboratory
of Nonferrous Metal
Chemistry and Resources Utilization of Gansu Province, Lanzhou 730000,
P. R. of China
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24
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Guin S, Ghosh T, Rout SK, Banerjee A, Patel BK. Cu(II) catalyzed imine C-H functionalization leading to synthesis of 2,5-substituted 1,3,4-oxadiazoles. Org Lett 2011; 13:5976-9. [PMID: 22007797 DOI: 10.1021/ol202409r] [Citation(s) in RCA: 108] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A direct access to symmetrical and unsymmetrical 2,5-disubstituted [1,3,4]-oxadiazoles has been accomplished through an imine C-H functionalization of N-arylidenearoylhydrazide using a catalytic quantity of Cu(OTf)(2). This is the first example of amidic oxygen functioning as a nucleophile in a Cu-catalyzed oxidative coupling of an imine C-H bond. These reactions can be performed in air atmosphere and moisture making it exceptionally practical for application in organic synthesis.
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Affiliation(s)
- Srimanta Guin
- Department of Chemistry, Indian Institution of Technology Guwahati, Guwahati 781 039, India
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25
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Chen X, Yang H, Ge Y, Feng L, Jia J, Wang J. Synthesis, X-ray crystal structure and optical properties of novel 2-aryl-3-ethoxycarbonyl-4-phenylpyrido[1,2-a]benzimidazoles. LUMINESCENCE 2011; 27:382-9. [DOI: 10.1002/bio.1362] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2011] [Revised: 08/29/2011] [Accepted: 08/31/2011] [Indexed: 11/06/2022]
Affiliation(s)
- Xia Chen
- School of Chemistry and Chemical Engineering; Shandong University; Jinan; 250100; Shandong; People's Republic of China
| | - He Yang
- School of Chemistry and Chemical Engineering; Shandong University; Jinan; 250100; Shandong; People's Republic of China
| | - Yanqing Ge
- School of Chemistry and Chemical Engineering; Taishan Medical University; Taian; Shandong; 271016; People's Republic of China
| | - Lei Feng
- School of Chemistry and Chemical Engineering; Shandong University; Jinan; 250100; Shandong; People's Republic of China
| | | | - Jianwu Wang
- School of Chemistry and Chemical Engineering; Shandong University; Jinan; 250100; Shandong; People's Republic of China
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26
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Mizar P, Hormi M, Rajbangshi M, Myrboh B. Synthesis of 2,3-dihydro-6H-1-oxa-3a-aza-phenalene and its benzo/hetero-fused analog. J Heterocycl Chem 2011. [DOI: 10.1002/jhet.680] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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27
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Lu J, Jin Y, Liu H, Jiang Y, Fu H. Copper-Catalyzed Aerobic Oxidative Intramolecular Alkene C–H Amination Leading to N-Heterocycles. Org Lett 2011; 13:3694-7. [DOI: 10.1021/ol2013395] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Juyou Lu
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China, and Key Laboratory of Chemical Biology (Guangdong Province), Graduate School of Shenzhen, Tsinghua University, Shenzhen 518057, P. R. China
| | - Yibao Jin
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China, and Key Laboratory of Chemical Biology (Guangdong Province), Graduate School of Shenzhen, Tsinghua University, Shenzhen 518057, P. R. China
| | - Hongxia Liu
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China, and Key Laboratory of Chemical Biology (Guangdong Province), Graduate School of Shenzhen, Tsinghua University, Shenzhen 518057, P. R. China
| | - Yuyang Jiang
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China, and Key Laboratory of Chemical Biology (Guangdong Province), Graduate School of Shenzhen, Tsinghua University, Shenzhen 518057, P. R. China
| | - Hua Fu
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China, and Key Laboratory of Chemical Biology (Guangdong Province), Graduate School of Shenzhen, Tsinghua University, Shenzhen 518057, P. R. China
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28
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Wang H, Wang Y, Liang D, Liu L, Zhang J, Zhu Q. Copper-Catalyzed Intramolecular Dehydrogenative Aminooxygenation: Direct Access to Formyl-Substituted Aromatic N-Heterocycles. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201100362] [Citation(s) in RCA: 91] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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29
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Wang H, Wang Y, Liang D, Liu L, Zhang J, Zhu Q. Copper-Catalyzed Intramolecular Dehydrogenative Aminooxygenation: Direct Access to Formyl-Substituted Aromatic N-Heterocycles. Angew Chem Int Ed Engl 2011; 50:5678-81. [DOI: 10.1002/anie.201100362] [Citation(s) in RCA: 302] [Impact Index Per Article: 23.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2011] [Revised: 03/23/2011] [Indexed: 11/08/2022]
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30
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Husinec S, Markovic R, Petkovic M, Nasufovic V, Savic V. A Base Promoted Cyclization of N-Propargylaminopyridines. Synthesis of Imidazo[1,2-a]pyridine Derivatives. Org Lett 2011; 13:2286-9. [DOI: 10.1021/ol200508x] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Suren Husinec
- Institute of Chemistry, Technology and Metallurgy, Centre for Chemistry, P.O. Box 815, Njegoseva 12, 11000 Belgrade, Serbia, University of Belgrade, Faculty of Chemistry, Studentski Trg 12-16, 11000 Belgrade, Serbia, and University of Belgrade, Faculty of Pharmacy, Vojvode Stepe 450, 11221 Belgrade, Serbia
| | - Rade Markovic
- Institute of Chemistry, Technology and Metallurgy, Centre for Chemistry, P.O. Box 815, Njegoseva 12, 11000 Belgrade, Serbia, University of Belgrade, Faculty of Chemistry, Studentski Trg 12-16, 11000 Belgrade, Serbia, and University of Belgrade, Faculty of Pharmacy, Vojvode Stepe 450, 11221 Belgrade, Serbia
| | - Milos Petkovic
- Institute of Chemistry, Technology and Metallurgy, Centre for Chemistry, P.O. Box 815, Njegoseva 12, 11000 Belgrade, Serbia, University of Belgrade, Faculty of Chemistry, Studentski Trg 12-16, 11000 Belgrade, Serbia, and University of Belgrade, Faculty of Pharmacy, Vojvode Stepe 450, 11221 Belgrade, Serbia
| | - Veselin Nasufovic
- Institute of Chemistry, Technology and Metallurgy, Centre for Chemistry, P.O. Box 815, Njegoseva 12, 11000 Belgrade, Serbia, University of Belgrade, Faculty of Chemistry, Studentski Trg 12-16, 11000 Belgrade, Serbia, and University of Belgrade, Faculty of Pharmacy, Vojvode Stepe 450, 11221 Belgrade, Serbia
| | - Vladimir Savic
- Institute of Chemistry, Technology and Metallurgy, Centre for Chemistry, P.O. Box 815, Njegoseva 12, 11000 Belgrade, Serbia, University of Belgrade, Faculty of Chemistry, Studentski Trg 12-16, 11000 Belgrade, Serbia, and University of Belgrade, Faculty of Pharmacy, Vojvode Stepe 450, 11221 Belgrade, Serbia
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31
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Singh OM, Devi NS, Devi LR, Lim KB, Yoon YJ, Lee SG. Facile Synthesis of 3-Thioxo-3H-benzo[f]chromen-2-yl methanone and 3H-Benzo[f]chromene-3-one Under Solvent Free Condition. B KOREAN CHEM SOC 2011. [DOI: 10.5012/bkcs.2011.32.1.175] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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32
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Liao Q, Zhang L, Li S, Xi C. Domino N−H/C−H Bond Activation: Copper-Catalyzed Synthesis of Nitrogen-Bridgehead Heterocycles Using Azoles and 1,4-Dihalo-1,3-dienes. Org Lett 2010; 13:228-31. [DOI: 10.1021/ol1026365] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Qian Liao
- Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, China, and State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, China
| | - Liyun Zhang
- Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, China, and State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, China
| | - Shutao Li
- Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, China, and State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, China
| | - Chanjuan Xi
- Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, China, and State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, China
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33
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Wang M, Ai L, Zhang JY, Liu Q, Gao LX. Synthesis of 2-Benzylthio-5-phenyl-3,4-disubstituted Thiophenes by Intramolecular Condensation of α-Oxo Ketene Dibenzyl-thioacetals. CHINESE J CHEM 2010. [DOI: 10.1002/cjoc.20020201223] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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34
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Chanu LG, Singh OM, Jang SH, Lee SG. Regioselective Synthesis of Heterocyclic Ketene N,N-, N,O- and N,S-acetals in Aqueous Medium. B KOREAN CHEM SOC 2010. [DOI: 10.5012/bkcs.2010.31.04.859] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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35
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Döring M, Pufky-Heinrich D, Ciesielski M, Gharnati L, Walter O. Copper-Mediated Oxidative Cyclization of Heterocyclically Substituted Aldimines. HETEROCYCLES 2010. [DOI: 10.3987/com-10-11966] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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36
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Kianmehr E, Ghanbari M, Niri MN, Faramarzi R. Novel One-Pot Three Component Reaction for the Synthesis of [2-(Alkylsulfanyl)imidazo[1,2-a]pyridin-3-yl](aryl)methanone. ACTA ACUST UNITED AC 2009; 12:41-4. [DOI: 10.1021/cc900103r] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ebrahim Kianmehr
- School of Chemistry, College of Science, University of Tehran, P.O. Box 14155-6455, Tehran, Iran
| | - Mohammad Ghanbari
- School of Chemistry, College of Science, University of Tehran, P.O. Box 14155-6455, Tehran, Iran
| | - Mehri Nadiri Niri
- School of Chemistry, College of Science, University of Tehran, P.O. Box 14155-6455, Tehran, Iran
| | - Reza Faramarzi
- School of Chemistry, College of Science, University of Tehran, P.O. Box 14155-6455, Tehran, Iran
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37
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Singh OM, Singh SJ, Devi MB, Devi LN, Singh NI, Lee SG. Synthesis and in vitro evaluation of the antifungal activities of dihydropyrimidinones. Bioorg Med Chem Lett 2008; 18:6462-7. [DOI: 10.1016/j.bmcl.2008.10.063] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2008] [Accepted: 10/15/2008] [Indexed: 11/30/2022]
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38
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39
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Wen LR, Sun JH, Li M, Sun ET, Zhang SS. Application of β-(2-Chloroaroyl) Thioacetanilides in Synthesis: An Unusual and Highly Efficient Access to Thiochromeno[2,3-b]pyridine Derivatives. J Org Chem 2008; 73:1852-63. [DOI: 10.1021/jo7024702] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Li-Rong Wen
- Key Laboratory of Eco-Chemical Engineering, Ministry of Education, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Ji-Hui Sun
- Key Laboratory of Eco-Chemical Engineering, Ministry of Education, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Ming Li
- Key Laboratory of Eco-Chemical Engineering, Ministry of Education, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - En-Tao Sun
- Key Laboratory of Eco-Chemical Engineering, Ministry of Education, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Shu-Sheng Zhang
- Key Laboratory of Eco-Chemical Engineering, Ministry of Education, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
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40
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Katritzky AR, Khashab NM, Haase DN, Yoshioka M, Ghiviriga I, Steel PJ. C-Aminoimidoylation and C-Thiocarbamoylation of Esters, Sulfones, and Ketones. J Org Chem 2007; 72:6742-8. [PMID: 17676901 DOI: 10.1021/jo070545c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Esters, sulfones, and ketones were C-aminoimidoylated and C-thiocarbamoylated by benzotriazole-1-carboxamidines 8a-g and 1-(alkyl-or-arylthiocarbamoyl)benzotriazoles 9a-i, respectively. The present work represents the first systematic approach to these compound classes, the few previously known examples of which were obtained by diverse approaches.
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Affiliation(s)
- Alan R Katritzky
- University of Florida, Department of Chemistry, Gainesville, Florida 32611-7200, USA.
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41
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Sherman ES, Fuller PH, Kasi D, Chemler SR. Pyrrolidine and piperidine formation via copper(II) carboxylate-promoted intramolecular carboamination of unactivated olefins: diastereoselectivity and mechanism. J Org Chem 2007; 72:3896-905. [PMID: 17428100 PMCID: PMC2590667 DOI: 10.1021/jo070321u] [Citation(s) in RCA: 134] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An expanded substrate scope and in-depth analysis of the reaction mechanism of the copper(II) carboxylate-promoted intramolecular carboamination of unactivated alkenes is described. This method provides access to N-functionalized pyrrolidines and piperidines. Both aromatic and aliphatic gamma- and delta-alkenyl N-arylsulfonamides undergo the oxidative cyclization reaction efficiently. N-Benzoyl-2-allylaniline also underwent the oxidative cyclization. The terminal olefin substrates examined were more reactive than those with internal olefins, and the latter terminated in elimination rather than carbon-carbon bond formation. The efficiency of the reaction was enhanced by the use of more organic soluble copper(II) carboxylate salts, copper(II) neodecanoate in particular. The reaction times were reduced by the use of microwave heating. High levels of diastereoselectivity were observed in the synthesis of 2,5-disubstituted pyrrolidines, wherein the cis substitution pattern predominates. The mechanism of the reaction is discussed in the context of the observed reactivity and in comparison to analogous reactions promoted by other reagents and conditions. Our evidence supports a mechanism wherein the N-C bond is formed via intramolecular syn aminocupration and the C-C bond is formed via intramolecular addition of a primary carbon radical to an aromatic ring.
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42
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Singh OM, Ahmed MF, Singh SJ, Lee SG. Synthesis of Amino Substituted Pyrazoles. JOURNAL OF CHEMICAL RESEARCH 2007. [DOI: 10.3184/030823407x209723] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
An efficient and convenient synthesis of substituted pyrazoles with aryl and heteroarylamino substituents attached to the C-3 and C-5 positions by the action of hydrazine hydrate on either ketene N,S-acetals or mixed N,N-aminals hydrate is reported.
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Affiliation(s)
| | | | | | - Sang-Gyeong Lee
- Department of Chemistry and Research Institute of Life Science, Gyeongsang National University, JinJu, GyeongNam 660-701, South Korea
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43
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Chemler SR, Fuller PH. Heterocycle synthesis by copper facilitated addition of heteroatoms to alkenes, alkynes and arenes. Chem Soc Rev 2007; 36:1153-60. [PMID: 17576482 DOI: 10.1039/b607819m] [Citation(s) in RCA: 290] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The de novo synthesis of small organic heterocyclic molecules has benefited from recent protocols for copper-facilitated additions of heteroatoms to alkenes, alkynes and arenes. This tutorial review summarizes a number of these recent contributions. Copper salts can facilitate bond formations due to their ability to serve as Lewis acids, oxidizing agents and transition metal catalysts. The current understanding of the mechanisms of these reactions is presented. This review should be of interest to chemists involved in the synthesis of heterocycles and those investigating transition metal facilitated reactions.
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Affiliation(s)
- Sherry R Chemler
- Department of Chemistry, The University at Buffalo, The State University of New York, Buffalo, NY 14260, USA.
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44
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Zhang Q, Zhao YL, Shi Y, Wang LX, Liu Q. FIRST SYNTHESIS OF SINGLE AND MIXED α-OXO KETENE DITHIOACETALS FROM ACTIVE METHENYL PRECURSORS. SYNTHETIC COMMUN 2006. [DOI: 10.1081/scc-120006008] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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45
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A C–C bond formation reaction at the α-carbon atom of α-oxo ketene dithioacetals via the Baylis–Hillman type reaction. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.04.108] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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46
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Sherman ES, Chemler SR, Tan TB, Gerlits O. Copper(II) acetate promoted oxidative cyclization of arylsulfonyl-o-allylanilines. Org Lett 2005; 6:1573-5. [PMID: 15128239 DOI: 10.1021/ol049702+] [Citation(s) in RCA: 111] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Tosyl-o-allylaniline 1 undergoes oxidative cyclization to produce tetracycle 2 upon treatment with Cu(OAc)(2) and Cs(2)CO(3) at 120 degrees C. The scope of the reaction was extended to other N-sulfonylated aromatic systems.
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Affiliation(s)
- Eric S Sherman
- Department of Chemistry, Rm. 618 Natural Sciences Complex, University at Buffalo, The State University of New York, Buffalo, New York 14260, USA
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47
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Wang M, Xu XX, Sun SG, Liu Q. The Alkoxy Substitution Reaction on α-Oxo Ketene Dithioacetals: A New Access to α-Oxo Ketene O,S-/O,O-Acetals. SYNTHETIC COMMUN 2004. [DOI: 10.1081/scc-120027265] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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48
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Liu Y, Dong D, Liu Q, Qi Y, Wang Z. A novel and facile synthesis of dienals and substituted 2H-pyrans via the Vilsmeier reaction of α-oxo-ketenedithioacetals. Org Biomol Chem 2004; 2:28-30. [PMID: 14737655 DOI: 10.1039/b313977h] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel and facile synthesis of dienals (3a, 3b) and substituted 2H-pyrans (4c, 4d) from a series of [small alpha]-oxo ketenedithioacetals containing a methyl group adjacent to the carbonyl group (1a-d)via the Vilsmeier reaction has been developed and a mechanism for the reactions has been proposed.
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Affiliation(s)
- Yingchun Liu
- Department of Chemistry, Northeast Normal University, Changchun, 130024, P. R. China
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49
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Mahata PK, Venkatesh C, Syam Kumar UK, Ila H, Junjappa H. Reaction of alpha-oxoketene-N,S-arylaminoacetals with Vilsmeier reagents: an efficient route to highly functionalized quinolines and their benzo/hetero-fused analogues. J Org Chem 2003; 68:3966-75. [PMID: 12737579 DOI: 10.1021/jo034053l] [Citation(s) in RCA: 122] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A simple, highly efficient, and regioselective synthesis of functionalized quinolines through Vilsmeier cyclization of a variety of alpha-oxoketene-N,S-anilinoacetals has been reported. The cyclization is found to be facile with N,S-acetals bearing strongly activating groups on aniline, whereas yields of quinolines are moderate in other cases. The reaction could also be extended for the synthesis of substituted tricyclic benzo[h]quinoline, pyrido[2,3-h]quinoline, 4,7-diphenylphenanthroline, and tetracyclic quino[8,7-h]quinoline by performing a Vilsmeier reaction on N,S-acetals derived from 1-naphthylamine, m-phenylenediamine, o-phenylenediamine, and 1,5-diaminonaphthalene, respectively. A few of the newly synthesized quinolines are subjected to further transformation to afford 2-unsubstituted (Raney-Ni/Ethanol), quinoline-5,8-quinone (NBS/H(2)SO(4)), or 2-alkyl/aryl aminoquinolines through sequential m-CPBA oxidation to the corresponding (2-methylsulfonyl)quinoline followed by replacement with appropriate amines. Similarly, cycloannulation of a few 2-methylthio-3-benzoylquinolines with hydrazine hydrate under microwave irradiation afforded the corresponding substituted and fused pyrazolo[3,4-b]quinolines in excellent yields, whereas TBTH/AIBN-mediated cyclization of the corresponding 3-(2-bromobenzoyl)-2-methylthioquinolines yielded the corresponding benzothiopyrano-fused quinolines through radical translocation.
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Affiliation(s)
- P K Mahata
- Department of Chemistry, Indian Institute of Technology, Kanpur-208016, India
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50
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Panda K, Suresh JR, Ila H, Junjappa H. Heteroaromatic annulation of 2-methyl/2-cyanomethylbenzimidazole dianions with alpha-oxoketene dithioacetals: a highly regioselective synthetic protocol for 1,2- and 2,3-substituted/annulated pyrido[1,2-a]benzimidazoles. J Org Chem 2003; 68:3498-506. [PMID: 12713352 DOI: 10.1021/jo026786w] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A highly efficient and regioselective annulation protocol for a series of linearly 2,3- and angularly 1,2-substituted and annulated pyrido[1,2-a]benzimidazoles involving [3 + 3] cyclocondensation of the dianions generated from 2-methyl (2A) and 2-cyanomethyl (3A) benzimidazoles with a variety of alpha-oxoketene dithioacetals has been reported. Thus the dianion 2A derived from 2-methylbenzimidazole has been shown to undergo regioselective 1,2-addition with various alpha-oxoketene dithioacetals derived from acyclic (4a-d) and cyclic ketones (13a,b, 20, 29 and 32) to afford various carbinol acetals which on intramolecular cyclocondensation in the presence of phosphoric acid furnish the corresponding 1-methylthio-2,3-substituted (5a-c) and 2,3-fused linear polycyclic (14a,b,21, 30, and 33) pyrido[1,2-a]benzimidazoles in high yields. Similarly the dianion 3A from 2-cyanomethylbenzimidazole undergoes one-pot conjugate addition-elimination and cyclocondensation with these alpha-oxoketene dithioacetals to give 4-cyano-3-(methylthio)-1(or 1,2-)-substituted (6a-d) and the corresponding angularly 1,2-fused (16a,b, 23, 31, and 34) polycylic analogues of pyrido[1,2-a]benzimidazoles in excellent yields.
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Affiliation(s)
- Kausik Panda
- Department of Chemistry, Indian Institute of Technology, Kanpur 208 016, India
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