1
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Johnson TC, Marsden SP. Three-Component Synthesis of Pyridylacetic Acid Derivatives by Arylation/Decarboxylative Substitution of Meldrum's Acids. J Org Chem 2022; 87:13891-13894. [PMID: 36257810 PMCID: PMC9638998 DOI: 10.1021/acs.joc.2c01597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
A convenient and simple three-component synthesis of substituted pyridylacetic acid derivatives is reported. The approach centers on the dual reactivity of Meldrum's acid derivatives, initially as nucleophiles to perform substitution on activated pyridine-N-oxides, then as electrophiles with a range of nucleophiles to trigger ring-opening and decarboxylation.
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2
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Kiren S, Mahmud Yakubu F, Mohammed H, Grimes F. A Microwave-Assisted, Two-Step Synthesis of Indolo[3,2-c]quinolines via Fischer Indolization and Oxidative Aromatization. HETEROCYCLES 2022. [DOI: 10.3987/com-22-14721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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3
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Organocatalysis: A Tool of Choice for the Enantioselective Nucleophilic Dearomatization of Electron-Deficient Six-Membered Ring Azaarenium Salts. Catalysts 2021. [DOI: 10.3390/catal11101249] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Nucleophilic dearomatization of azaarenium salts is a powerful strategy to access 3D scaffolds of interest from easily accessible planar aromatic azaarene compounds. Moreover, this approach yields complex dihydroazaarenes by allowing the functionalization of the scaffold simultaneously to the dearomatization step. On the other side, organocatalysis is nowadays recognized as one of the pillars of the asymmetric catalysis field of research and is well-known to afford a high level of enantioselectivity for a myriad of transformations thanks to well-organized transition states resulting from low-energy interactions (electrostatic and/or H-bonding interactions…). Consequently, in the last fifteen years, organocatalysis has met great success in nucleophilic dearomatization of azaarenium salts. This review summarizes the work achieved up to date in the field of organocatalyzed nucleophilic dearomatization of azaarenium salts (mainly pyridinium, quinolinium, quinolinium and acridinium salts). A classification by organocatalytic mode of activation will be disclosed by shedding light on their related advantages and drawbacks. The versatility of the dearomatization approach will also be demonstrated by discussing several chemical transformations of the resulting dihydroazaarenes towards the synthesis of structurally complex compounds.
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4
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Kim I, Kim SJ, Lee S. Regioselective Functionalization of N-Fused Heteroaromatics via FeCl3-Catalyzed Nucleophilic Addition to Activated N-Heterocycles. SYNTHESIS-STUTTGART 2020. [DOI: 10.1055/s-0040-1705985] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
AbstractBroadening of nitrogen-fused heteroaromatic chemical space such as indolizine and pyrrolo[1,2-a]pyrazine was achieved via FeCl3-catalyzed nucleophilic addition of these N-fused aromatic compounds to a wide range of azolinium systems generated in situ, leading to novel N-fused heteroaromatic scaffolds with dearomatized N-heterocyclic substituents regioselectively. Nucleophilic addition of indolizines and pyrrolo[1,2-a]pyrazines mainly occurred at the C1 position of the isoquinoliniums and at the C4 site of the quinoliniums.
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5
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Motornov VA, Tabolin AA, Nelyubina YV, Nenajdenko VG, Ioffe SL. Copper-mediated oxidative [3 + 2]-annulation of nitroalkenes and pyridinium imines: efficient synthesis of 3-fluoro- and 3-nitro-pyrazolo[1,5-a]pyridines. Org Biomol Chem 2020; 18:1436-1448. [PMID: 32022079 DOI: 10.1039/c9ob02668a] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
An efficient route to pyrazolo[1,5-a]pyridines by Cu(OAc)2-promoted oxidative [3 + 2]-annulation of nitroalkenes with in situ generated pyridinium imines is developed. The reaction with α-fluoronitroalkenes enables the first preparative synthesis of 3-fluoro-pyrazolo[1,5-a]pyridines. Cycloaddition with α-unsubstituted nitroalkenes provides access to 3-nitro-pyrazolo[1,5-a]pyridines in excellent yields. A broad transformation scope was demonstrated. Both electron-rich and electron-deficient nitroalkenes as well as different aminopyridinium salts can be used for the assembly of the target pyrazolo[1,5-a]pyridines. The related aza-heterocycles, namely, pyrazolo[1,5-a]pyrazines and pyrazolo[1,5-b]pyridazines, were successfully prepared via the present methodology. The possible mechanism of the reaction is discussed.
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Affiliation(s)
- Vladimir A Motornov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky prosp. 47, Moscow, 119991, Russia. and Higher Chemical College, D. I. Mendeleev University of Chemical Technology of Russia, Miusskaya sq. 9, Moscow, 125047, Russia
| | - Andrey A Tabolin
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky prosp. 47, Moscow, 119991, Russia.
| | - Yulia V Nelyubina
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov str. 28, Moscow, 119991, Russia
| | - Valentine G Nenajdenko
- Department of Chemistry, M. V. Lomonosov Moscow State University, Leninskie Gory 1, Moscow, 119991, Russia
| | - Sema L Ioffe
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky prosp. 47, Moscow, 119991, Russia.
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6
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Lee J, Ko D, Park H, Yoo EJ. Direct cyclopropanation of activated N-heteroarenes via site- and stereoselective dearomative reactions. Chem Sci 2020; 11:1672-1676. [PMID: 32206287 PMCID: PMC7069384 DOI: 10.1039/c9sc06369b] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Accepted: 12/30/2019] [Indexed: 12/23/2022] Open
Abstract
A divergent cyclopropanation reaction has been accomplished via the dearomative addition of sulfur ylides to activated N-heteroarenes.
A divergent cyclopropanation reaction has been accomplished via the dearomative addition of sulfur ylides to activated N-heteroarenes. A series of biologically significant molecular skeletons was obtained by the direct cyclopropanation of quinolinium zwitterions. Furthermore, a straightforward synthetic route to optically enriched cyclopropane-fused heterocycles was developed using sulfur ylides as chiral nucleophiles in the 1,4-dearomative reaction.
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Affiliation(s)
- Jiyoun Lee
- Department of Applied Chemistry , Kyung Hee University , Yongin , 17104 , Republic of Korea .
| | - Donguk Ko
- Department of Applied Chemistry , Kyung Hee University , Yongin , 17104 , Republic of Korea .
| | - Hyunju Park
- Department of Applied Chemistry , Kyung Hee University , Yongin , 17104 , Republic of Korea .
| | - Eun Jeong Yoo
- Department of Applied Chemistry , Kyung Hee University , Yongin , 17104 , Republic of Korea .
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7
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Wilde JH, Smith JA, Dickie DA, Harman WD. Molybdenum-Promoted Synthesis of Isoquinuclidines with Bridgehead CF 3 Groups. J Am Chem Soc 2019; 141:18890-18899. [PMID: 31684729 DOI: 10.1021/jacs.9b10781] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The preparation of the complex MoTp(NO)(DMAP)(4,5-η2-(2-trifluoromethyl)pyridine) (DMAP = 4-(dimethylamino)pyridine; Tp = tris(pyrazolyl)borate) is described. The CF3 substituent is found to preclude κ-N coordination, allowing for direct coordination without protection of the nitrogen. The dihapto-coordinate complex can be isolated as a single diastereomer, methylated, and reacted with a range of nucleophiles. Oxidative decomplexation affords the free dihydropyridines in good yield (75-90%). As a demonstration of synthetic utility, a series of novel bridgehead CF3-substituted isoquinuclidines was prepared from these decomplexed dihydropyridines.
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Affiliation(s)
- Justin H Wilde
- Department of Chemistry , University of Virginia , Charlottesville , Virginia 22904 , United States
| | - Jacob A Smith
- Department of Chemistry , University of Virginia , Charlottesville , Virginia 22904 , United States
| | - Diane A Dickie
- Department of Chemistry , University of Virginia , Charlottesville , Virginia 22904 , United States
| | - W Dean Harman
- Department of Chemistry , University of Virginia , Charlottesville , Virginia 22904 , United States
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8
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Affiliation(s)
- Sehoon Park
- Department of ChemistryGuangdong Technion Israel Institute of Technology Shantou Guangdong 515063 China
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9
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Avakyan EK, Amangasieva GА, Demidov OP, Borovleva AА, Beketova ES, Nechaeva OА, Borovlev IV. Nucleophilic addition of amide anions to 1-methyl-5(6,7,8)-nitroquinolinium salts. Chem Heterocycl Compd (N Y) 2019. [DOI: 10.1007/s10593-019-02529-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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10
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Motornov VA, Tabolin AA, Nelyubina YV, Nenajdenko VG, Ioffe SL. Copper-mediated oxidative [3 + 2]-annulation of nitroalkenes and pyridinium ylides: general access to functionalized indolizines and efficient synthesis of 1-fluoroindolizines. Org Biomol Chem 2019; 17:1442-1454. [PMID: 30672946 DOI: 10.1039/c8ob03126f] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
A general method for the synthesis of substituted indolizines by copper(ii) acetate-promoted oxidative [3 + 2]-annulation of α-fluoronitroalkenes with in situ generated pyridinium ylides was developed. Application of the copper(ii) acetate-2,6-lutidine system provides efficient access to various 1-fluoroindolizines in up to 81% yield. Both electron-rich and electron-deficient nitroalkenes as well as different pyridinium and isoquinolinium salts can be involved in the reaction. Moreover, it was found that copper-mediated annulation is applicable for other α-substituted (alkyl, chloro, and ester) nitroalkenes giving rise to the corresponding indolizines. First synthesis of monofluorinated [3,2,2]cyclazines was demonstrated via oxidative annulation of 3-unsubstituted fluoroindolizines with diethyl acetylene dicarboxylate.
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Affiliation(s)
- Vladimir A Motornov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky prosp. 47, Moscow, 119991, Russia.
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11
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Luo Y, Quan H, Zhu B, Li X, Zhan L. A Comparison between KBH4 and NaBH4 in Their Reduction of Pyridinium Salts. HETEROCYCLES 2019. [DOI: 10.3987/com-19-14138] [Citation(s) in RCA: 2] [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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12
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Bähr S, Oestreich M. A Neutral RuII
Hydride Complex for the Regio- and Chemoselective Reduction of N
-Silylpyridinium Ions. Chemistry 2018; 24:5613-5622. [DOI: 10.1002/chem.201705899] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2017] [Indexed: 11/05/2022]
Affiliation(s)
- Susanne Bähr
- Institut für Chemie; Technische Universität Berlin; Strasse des 17. Juni 115 10623 Berlin Germany
| | - Martin Oestreich
- Institut für Chemie; Technische Universität Berlin; Strasse des 17. Juni 115 10623 Berlin Germany
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13
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Park S, Chang S. Katalytische Desaromatisierung von N-Heteroarenen mit Silicium- und Borverbindungen. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201612140] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Sehoon Park
- Center for Catalytic Hydrocarbon Functionalizations; Institute for Basic Science, IBS, Daejeon; 305-701 Südkorea
- Department of Chemistry; Korea Advanced Institute of Science & Technology, KAIST; Daejeon 305-701 Südkorea
| | - Sukbok Chang
- Center for Catalytic Hydrocarbon Functionalizations; Institute for Basic Science, IBS, Daejeon; 305-701 Südkorea
- Department of Chemistry; Korea Advanced Institute of Science & Technology, KAIST; Daejeon 305-701 Südkorea
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14
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Park S, Chang S. Catalytic Dearomatization of N-Heteroarenes with Silicon and Boron Compounds. Angew Chem Int Ed Engl 2017; 56:7720-7738. [DOI: 10.1002/anie.201612140] [Citation(s) in RCA: 118] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Revised: 01/31/2017] [Indexed: 01/15/2023]
Affiliation(s)
- Sehoon Park
- Center for Catalytic Hydrocarbon Functionalizations; Institute for Basic Science, IBS, Daejeon; 305-701 South Korea
- Department of Chemistry; Korea Advanced Institute of Science & Technology, KAIST; Daejeon 305-701 South Korea
| | - Sukbok Chang
- Center for Catalytic Hydrocarbon Functionalizations; Institute for Basic Science, IBS, Daejeon; 305-701 South Korea
- Department of Chemistry; Korea Advanced Institute of Science & Technology, KAIST; Daejeon 305-701 South Korea
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15
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Aithagani SK, Kumar M, Yadav M, Vishwakarma RA, Singh PP. Metal-Free, Phosphonium Salt-Mediated Sulfoximination of Azine N-Oxides: Approach for the Synthesis of N-Azine Sulfoximines. J Org Chem 2016; 81:5886-94. [PMID: 27304317 DOI: 10.1021/acs.joc.6b00593] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Herein, we report a simple and metal-free method for the synthesis of N-azine sulfoximines by the nucleophilic substitution of azine N-oxides with NH-sulfoximines. The present method works at room temperature with wide functional group compatibility and gives several unprecedented N-azine sulfoximines. The reaction conditions were also found suitable with enantiopure substrates and furnished products without any racemization. It also finds an application in the sulfoximination of azine-based functional molecules such as 2,2'-bipyridine, 1,10-phenanthroline, and quinine.
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Affiliation(s)
- Sravan Kumar Aithagani
- Medicinal Chemistry Division, Academy of Scientific and Innovative Research, CSIR-Indian Institute of Integrative Medicine , Canal Road, Jammu-180001, India
| | - Mukesh Kumar
- Medicinal Chemistry Division, Academy of Scientific and Innovative Research, CSIR-Indian Institute of Integrative Medicine , Canal Road, Jammu-180001, India
| | - Mahipal Yadav
- Medicinal Chemistry Division, Academy of Scientific and Innovative Research, CSIR-Indian Institute of Integrative Medicine , Canal Road, Jammu-180001, India
| | - Ram A Vishwakarma
- Medicinal Chemistry Division, Academy of Scientific and Innovative Research, CSIR-Indian Institute of Integrative Medicine , Canal Road, Jammu-180001, India
| | - Parvinder Pal Singh
- Medicinal Chemistry Division, Academy of Scientific and Innovative Research, CSIR-Indian Institute of Integrative Medicine , Canal Road, Jammu-180001, India
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16
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Al Matarneh CM, Apostu MO, Mangalagiu II, Danac R. Reactions of ethyl cyanoformate with cycloimmonium salts: a direct pathway to fused or substituted azaheterocycles. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.05.061] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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17
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Affiliation(s)
- Yue Hu
- Department
of Chemistry, Columbia University, New York, New York 10027, United States
| | - Anthony P. Shaw
- Pyrotechnics
Technology and Prototyping Division, U.S. Army RDECOM-ARDEC, Picatinny Arsenal, New Jersey 07806, United States
| | - Deven P. Estes
- Department
of Chemistry, Columbia University, New York, New York 10027, United States
| | - Jack R. Norton
- Department
of Chemistry, Columbia University, New York, New York 10027, United States
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18
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Gandhamsetty N, Park S, Chang S. Selective Silylative Reduction of Pyridines Leading to Structurally Diverse Azacyclic Compounds with the Formation of sp³ C-Si Bonds. J Am Chem Soc 2015; 137:15176-84. [PMID: 26580152 DOI: 10.1021/jacs.5b09209] [Citation(s) in RCA: 77] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Tris(pentafluorophenyl)borane-catalyzed silylative reduction of pyridines has been developed giving rise to the formation of sp(3) C-Si bonds selectively beta to the nitrogen atom of azacyclic products. Depending on the position and nature of pyridine substituents, structurally diverse azacycles are obtained with high selectivity under the borane catalysis. Mechanistic studies elucidated the sequence of hydrosilylation in this multiple reduction cascade: 1,2- or 1,4-hydrosilylation as an initial step depending on the substituent position, followed by selective hydrosilylation of enamine double bonds eventually affording β-silylated azacyclic compounds.
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Affiliation(s)
- Narasimhulu Gandhamsetty
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS) , Daejeon 305-701, South Korea.,Department of Chemistry, Korea Advanced Institute of Science & Technology (KAIST) , Daejeon 305-701, South Korea
| | - Sehoon Park
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS) , Daejeon 305-701, South Korea.,Department of Chemistry, Korea Advanced Institute of Science & Technology (KAIST) , Daejeon 305-701, South Korea
| | - Sukbok Chang
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS) , Daejeon 305-701, South Korea.,Department of Chemistry, Korea Advanced Institute of Science & Technology (KAIST) , Daejeon 305-701, South Korea
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19
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Gandhamsetty N, Joung S, Park SW, Park S, Chang S. Boron-Catalyzed Silylative Reduction of Quinolines: Selective sp3 C–Si Bond Formation. J Am Chem Soc 2014; 136:16780-3. [DOI: 10.1021/ja510674u] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Narasimhulu Gandhamsetty
- Center
for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 305-701, South Korea
- Department
of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, South Korea
| | - Seewon Joung
- Center
for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 305-701, South Korea
- Department
of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, South Korea
| | - Sung-Woo Park
- Center
for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 305-701, South Korea
- Department
of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, South Korea
| | - Sehoon Park
- Center
for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 305-701, South Korea
- Department
of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, South Korea
| | - Sukbok Chang
- Center
for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 305-701, South Korea
- Department
of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, South Korea
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20
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Synthesis and Properties of Thiazolo- and Oxazolo-[3,2-a]Quinolinium Systems and Their Hydrogenated Derivatives (Review)*. Chem Heterocycl Compd (N Y) 2014. [DOI: 10.1007/s10593-014-1546-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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21
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Matsubara Y, Kosaka T, Koga K, Nagasawa A, Kobayashi A, Konno H, Creutz C, Sakamoto K, Ishitani O. Formation of η2-Coordinated Dihydropyridine–Ruthenium(II) Complexes by Hydride Transfer from Ruthenium(II) to Pyridinium Cations. Organometallics 2013. [DOI: 10.1021/om400862n] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yasuo Matsubara
- Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973-5000, United States
- PRESTO, Japan Science and Technology Agency (JST), Chiyoda-ku, Tokyo 102-0076, Japan
| | - Tatsumi Kosaka
- Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Saitama 338-8570, Japan
| | - Kichitaro Koga
- Department of Chemistry, Graduate School of
Science and Engineering, Tokyo Institute of Technology, O-okayama
2-12-1-NE-1, Meguro-ku, Tokyo 152-8550, Japan
| | - Akira Nagasawa
- Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Saitama 338-8570, Japan
| | - Atsuo Kobayashi
- Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Saitama 338-8570, Japan
| | - Hideo Konno
- Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Saitama 338-8570, Japan
| | - Carol Creutz
- Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973-5000, United States
| | - Kazuhiko Sakamoto
- Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Saitama 338-8570, Japan
| | - Osamu Ishitani
- Department of Chemistry, Graduate School of
Science and Engineering, Tokyo Institute of Technology, O-okayama
2-12-1-NE-1, Meguro-ku, Tokyo 152-8550, Japan
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22
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Tsukano C, Oimura A, Enkhtaivan I, Takemoto Y. Synthesis of Highly Oxidized Quinolizidine via Reduction of Acylpyridinium Cations, and Total Syntheses of Quinolizidines 207I and 1-epi-207I. Org Lett 2012; 14:1902-5. [DOI: 10.1021/ol300541u] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Chihiro Tsukano
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto, 606-8501, Japan
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23
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Lominac WJ, D’Angelo ML, Smith MD, Ollison DA, Hanna JM. Construction of pyrazolo[3,4-b]pyridines and pyrazolo[4,3-c]pyridines by ring closure of 3-acylpyridine N-oxide tosylhydrazones. Tetrahedron Lett 2012; 53:906-909. [PMID: 22345825 PMCID: PMC3278155 DOI: 10.1016/j.tetlet.2011.12.055] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
3-Acylpyridine N-oxide tosylhydrazones give good overall yields of a mixture of pyrazolo[3,4-b]pyridines and pyrazolo[4,3-c]pyridines when treated with an electrophilic additive and an amine base. (Z)-Hydrazones cyclize readily, while (E)-hydrazones fail to react under the reported conditions. The reaction takes place at room temperature, and moderate regiocontrol over the cyclization can be achieved by varying the electrophile/solvent combination.
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Affiliation(s)
- William J. Lominac
- Department of Chemistry, Physics, and Geology, Winthrop University, Sims Science Building, Rock Hill, SC 29733 USA
| | - Megan L. D’Angelo
- Department of Chemistry, Physics, and Geology, Winthrop University, Sims Science Building, Rock Hill, SC 29733 USA
| | - Mark D. Smith
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC 29208 USA
| | - Darius A. Ollison
- Department of Chemistry, Physics, and Geology, Winthrop University, Sims Science Building, Rock Hill, SC 29733 USA
| | - James M. Hanna
- Department of Chemistry, Physics, and Geology, Winthrop University, Sims Science Building, Rock Hill, SC 29733 USA
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24
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Londregan AT, Jennings S, Wei L. Mild Addition of Nucleophiles to Pyridine-N-Oxides. Org Lett 2011; 13:1840-3. [DOI: 10.1021/ol200352g] [Citation(s) in RCA: 98] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Allyn T. Londregan
- CVMED Medicinal Chemistry, Pfizer Inc., Eastern Point Road, Groton, Connecticut, 06340, United States
| | - Sandra Jennings
- CVMED Medicinal Chemistry, Pfizer Inc., Eastern Point Road, Groton, Connecticut, 06340, United States
| | - Liuqing Wei
- CVMED Medicinal Chemistry, Pfizer Inc., Eastern Point Road, Groton, Connecticut, 06340, United States
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25
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Abstract
A general and facile one-pot amination procedure for the synthesis of 2-aminopyridines from the corresponding pyridine-N-oxides is presented as a mild alternative to S(N)Ar chemistry. A variety of amines and heterocyclic-N-oxides participate effectively in this transformation which uses the phosphonium salt, PyBroP, as a means of substrate activation.
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Affiliation(s)
- Allyn T Londregan
- CVMED Medicinal Chemistry, Pfizer Inc., Eastern Point Road, Groton, Connecticut 06340, United States.
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Chemistry of N-(1-haloalkyl)heteroarylium salts. ADVANCES IN HETEROCYCLIC CHEMISTRY 2000. [DOI: 10.1016/s0065-2725(00)77006-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register]
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