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Mack KA, Collum DB. Case for Lithium Tetramethylpiperidide-Mediated Ortholithiations: Reactivity and Mechanisms. J Am Chem Soc 2018; 140:4877-4883. [PMID: 29589920 PMCID: PMC6141241 DOI: 10.1021/jacs.8b00590] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Rate and mechanistic studies of ortholithiations by lithium 2,2,6,6-tetramethylpiperidide focus on four arenes: 1,4-bis(trifluoromethyl)benzene, 1,3-bis(trifluoromethyl)benzene, 1,3-dimethoxybenzene, and 4,4-dimethyl-2-phenyl-2-oxazoline. Metalations occur via substrate-dependent combinations of monosolvated monomer, disolvated monomer, and tetrasolvated dimer (triple ions). Density functional theory computational studies augment the experimental data. We discuss the challenges presented by shifting dimer-monomer proportions in determining the observable reaction orders and our mathematical treatment of such shifting in reactant structure.
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Affiliation(s)
- Kyle A Mack
- Department of Chemistry and Chemical Biology Baker Laboratory , Cornell University , Ithaca , New York 14853-1301 , United States
| | - David B Collum
- Department of Chemistry and Chemical Biology Baker Laboratory , Cornell University , Ithaca , New York 14853-1301 , United States
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2
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Algera RF, Ma Y, Collum DB. Sodium Diisopropylamide in Tetrahydrofuran: Selectivities, Rates, and Mechanisms of Arene Metalations. J Am Chem Soc 2017; 139:15197-15204. [PMID: 28946744 DOI: 10.1021/jacs.7b08734] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Sodium diisopropylamide (NaDA)-mediated metalations of arenes in tetrahydrofuran (THF)/hexane or THF/Me2NEt solutions are described. A survey of >40 benzenoid- and pyridine-based arenes with a range of substituents demonstrates the efficacy and regioselectivity of metalation. Metalations of activated disubstituted arenes and selected monosubstituted arenes are rapid at -78 °C. Rate studies of 1,3-dimethoxybenzene and related methoxylated arenes show exclusively monomer-based orthometalations with two or three coordinated THF ligands. Rate studies of the isotopic exchange of benzene and monosubstituted arenes with weakly activating groups reveal analogous di- and trisolvated monomer-based metalations. Cooperative inductive, mesomeric, steric, and chelate effects are discussed.
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Affiliation(s)
- Russell F Algera
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University , Ithaca, New York 14853-1301, United States
| | - Yun Ma
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University , Ithaca, New York 14853-1301, United States
| | - David B Collum
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University , Ithaca, New York 14853-1301, United States
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3
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Fused Systems Based on 2-Aminopyrimidines: Synthesis Combining Deprotolithiation-in situ Zincation withN-Arylation Reactions and Biological Properties. European J Org Chem 2017. [DOI: 10.1002/ejoc.201701004] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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4
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Shu YB, Liu WS. Luminescent chiral Eu(III) complexes with enantiopure bis(1H-pyridin-2-one)salen ligands. Polyhedron 2015. [DOI: 10.1016/j.poly.2015.10.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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5
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Heterocyclic chalcone activators of nuclear factor (erythroid-derived 2)-like 2 (Nrf2) with improved in vivo efficacy. Bioorg Med Chem 2015; 23:5352-9. [PMID: 26278028 DOI: 10.1016/j.bmc.2015.07.056] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Revised: 07/18/2015] [Accepted: 07/26/2015] [Indexed: 12/21/2022]
Abstract
Nrf2 activators represent a good drug target for designing agents to treat diseases associated with oxidative stress. Building upon previous work, we designed and prepared a series of heterocyclic chalcone-based Nrf2 activators with reduced lipophilicity and, in some cases, greater in vitro potency compared to the respective carbocyclic scaffold. These changes resulted in enhanced oral bioavailability and a superior pharmacodynamic effect in vivo.
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6
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Kobayashi K, Komatsu T, Yuba S, Chikazawa Y, Tanmatsu M. Synthesis of 10-Substituted Pyrido[2,3-b][1,8]naphthyridin-5(10H)-ones (Anthyridin-5(10H)-ones) Based on the Reaction of Bis(2-chloropyridin-3-yl)methanones with Primary Amines. HETEROCYCLES 2015. [DOI: 10.3987/com-15-13233] [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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7
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8
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Kobayashi K, Yuba S, Komatsu T. Synthesis of 10-Substituted Benzo[b][1,8]naphthyridin-5(10H)-ones Based on the Reaction of (2-Chloropyridin-3-yl)(2-halophenyl)methanones with Primary Amines. HETEROCYCLES 2014. [DOI: 10.3987/com-13-12919] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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9
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Synthesis of azafluorenones and related compounds using deprotocupration–aroylation followed by intramolecular direct arylation. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.09.030] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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10
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Kobayashi K, Imaoka A. A Convenient Synthesis of 2,3-Dihydro-4H-thiopyrano[2,3-b]-, -[2,3-c]-, or -[3,2-c]pyridin-4-ones by the Reaction of the Corresponding 1-(Chloropyridinyl)alk-2-en-1-ones with NaSH. Helv Chim Acta 2013. [DOI: 10.1002/hlca.201200543] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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11
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Fang Y, Larock RC. Nucleophilic addition to 2,3-pyridyne and synthesis of benzonaphthyridinones. Tetrahedron 2012; 68:2819-2826. [PMID: 23519554 DOI: 10.1016/j.tet.2012.02.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Abstract
A study of the nucleophilic addition of amines to 2,3-pyridyne has been carried out. 2-Aminopyridines have been generated exclusively. A series of benzonaphthyridinones have been synthesized by reacting 2,3-pyridyne and o-aminobenzoates.
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Affiliation(s)
- Yuesi Fang
- Department of Chemistry, Iowa State University, Ames, IA 50011, USA
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12
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Snégaroff K, Nguyen TT, Marquise N, Halauko YS, Harford PJ, Roisnel T, Matulis VE, Ivashkevich OA, Chevallier F, Wheatley AEH, Gros PC, Mongin F. Deprotonative Metalation of Chloro- and Bromopyridines Using Amido-Based Bimetallic Species and Regioselectivity-Computed CH Acidity Relationships. Chemistry 2011; 17:13284-97. [PMID: 22006709 DOI: 10.1002/chem.201101993] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2011] [Indexed: 11/07/2022]
Affiliation(s)
- Katia Snégaroff
- Chimie et Photonique Moléculaires, UMR 6510 CNRS, Université de Rennes 1, Bâtiment 10A, Case 1003, Campus Scientifique de Beaulieu, 35042 Rennes Cedex, France
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13
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Nguyen TT, Marquise N, Chevallier F, Mongin F. Deprotonative Metalation of Aromatic Compounds by Using an Amino-Based Lithium Cuprate. Chemistry 2011; 17:10405-16. [DOI: 10.1002/chem.201100990] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2011] [Indexed: 11/08/2022]
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14
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Hoepker AC, Gupta L, Ma Y, Faggin MF, Collum DB. Regioselective lithium diisopropylamide-mediated ortholithiation of 1-chloro-3-(trifluoromethyl)benzene: role of autocatalysis, lithium chloride catalysis, and reversibility. J Am Chem Soc 2011; 133:7135-51. [PMID: 21500823 PMCID: PMC3102585 DOI: 10.1021/ja200906z] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Ortholithiation of 1-chloro-3-(trifluoromethyl)benzene with lithium diisopropylamide (LDA) in tetrahydrofuran at -78 °C displays characteristics of reactions in which aggregation events are rate limiting. Metalation with lithium-chloride-free LDA involves a rate-limiting deaggregation via dimer-based transition structures. The post-rate-limiting proton transfers are suggested to involve highly solvated triple ions. Autocatalysis by the resulting aryllithiums or catalysis by traces (<100 ppm) of LiCl diverts the reaction through di- and trisolvated monomer-based pathways for metalation at the 2 and 6 positions, respectively. The regiochemistry is dictated by a combination of kinetically controlled metalations overlaid by an equilibration involving diisopropylamine that is shown to occur by the microscopic reverse of the monomer-based metalations.
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Affiliation(s)
- Alexander C. Hoepker
- Department of Chemistry and Chemical Biology Baker Laboratory, Cornell University, Ithaca, New York 14853-1301
| | - Lekha Gupta
- Department of Chemistry and Chemical Biology Baker Laboratory, Cornell University, Ithaca, New York 14853-1301
| | - Yun Ma
- Department of Chemistry and Chemical Biology Baker Laboratory, Cornell University, Ithaca, New York 14853-1301
| | - Marc F. Faggin
- Department of Chemistry and Chemical Biology Baker Laboratory, Cornell University, Ithaca, New York 14853-1301
| | - David B. Collum
- Department of Chemistry and Chemical Biology Baker Laboratory, Cornell University, Ithaca, New York 14853-1301
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15
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Ma Y, Hoepker AC, Gupta L, Faggin MF, Collum DB. 1,4-addition of lithium diisopropylamide to unsaturated esters: role of rate-limiting deaggregation, autocatalysis, lithium chloride catalysis, and other mixed aggregation effects. J Am Chem Soc 2010; 132:15610-23. [PMID: 20961095 PMCID: PMC2989387 DOI: 10.1021/ja105855v] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Lithium diisopropylamide (LDA) in tetrahydrofuran at -78 °C undergoes 1,4-addition to an unsaturated ester via a rate-limiting deaggregation of LDA dimer followed by a post-rate-limiting reaction with the substrate. Muted autocatalysis is traced to a lithium enolate-mediated deaggregation of the LDA dimer and the intervention of LDA-lithium enolate mixed aggregates displaying higher reactivities than LDA. Striking accelerations are elicited by <1.0 mol % LiCl. Rate and mechanistic studies have revealed that the uncatalyzed and catalyzed pathways funnel through a common monosolvated-monomer-based intermediate. Four distinct classes of mixed aggregation effects are discussed.
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Affiliation(s)
- Yun Ma
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301
| | - Alexander C. Hoepker
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301
| | - Lekha Gupta
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301
| | - Marc F. Faggin
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301
| | - David B. Collum
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301
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16
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Viciu MS, Gupta L, Collum DB. Mechanism of lithium diisopropylamide-mediated substitution of 2,6-difluoropyridine. J Am Chem Soc 2010; 132:6361-5. [PMID: 20397635 PMCID: PMC2872121 DOI: 10.1021/ja910834b] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Treatment of 2,6-difluoropyridine with lithium diisopropylamide in THF solution at -78 degrees C effects ortholithiation quantitatively. Warming the solution to 0 degrees C converts the aryllithium to 2-fluoro-6-(diisopropylamino)pyridine. Rate studies reveal evidence of a reversal of the ortholithiation and a subsequent 1,2-addition via two monomer-based pathways of stoichiometries [ArH*i-Pr(2)NLi(THF)](double dagger) and [ArH*i-Pr(2)NLi(THF)(3)](double dagger). Computational studies fill in the structural details and provide evidence of a direct substitution without the intermediacy of a Meisenheimer complex.
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Affiliation(s)
- Mihai S. Viciu
- Department of Chemistry and Chemical Biology Baker Laboratory, Cornell University, Ithaca, New York 14853-1301
| | - Lekha Gupta
- Department of Chemistry and Chemical Biology Baker Laboratory, Cornell University, Ithaca, New York 14853-1301
| | - David B. Collum
- Department of Chemistry and Chemical Biology Baker Laboratory, Cornell University, Ithaca, New York 14853-1301
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17
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Tricyclic-isoxazolidine analogues via intramolecular 1,3-dipolar cycloaddition reactions of nitrones. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.01.062] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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18
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Khartabil HK, Gros PC, Fort Y, Ruiz-López MF. Metalation of Pyridines with nBuLi−Li−Aminoalkoxide Mixed Aggregates: The Origin of Chemoselectivity. J Am Chem Soc 2010; 132:2410-6. [DOI: 10.1021/ja910350q] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hassan K. Khartabil
- Equipe Chimie et Biochimie Théoriques and Equipe Synthèse Organométallique et Réactivité, SRSMC, Nancy-University, CNRS, BP 70239, 54506 Vandoeuvre-lès-Nancy, France
| | - Philippe C. Gros
- Equipe Chimie et Biochimie Théoriques and Equipe Synthèse Organométallique et Réactivité, SRSMC, Nancy-University, CNRS, BP 70239, 54506 Vandoeuvre-lès-Nancy, France
| | - Yves Fort
- Equipe Chimie et Biochimie Théoriques and Equipe Synthèse Organométallique et Réactivité, SRSMC, Nancy-University, CNRS, BP 70239, 54506 Vandoeuvre-lès-Nancy, France
| | - Manuel F. Ruiz-López
- Equipe Chimie et Biochimie Théoriques and Equipe Synthèse Organométallique et Réactivité, SRSMC, Nancy-University, CNRS, BP 70239, 54506 Vandoeuvre-lès-Nancy, France
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19
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Nguyen TT, Chevallier F, Jouikov V, Mongin F. New Gilman-type lithium cuprate from a copper(II) salt: synthesis and deprotonative cupration of aromatics. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.09.100] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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20
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Gros PC, Fort Y. Combinations of Alkyllithiums and Lithium Aminoalkoxides for Generation of Functional Pyridine Organometallics and Derivatives. European J Org Chem 2009. [DOI: 10.1002/ejoc.200900324] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Philippe C. Gros
- Groupe SOR, SRSMC, CNRS, Nancy Université, Faculté des Sciences, Boulevard des Aiguillettes, 54506 Vandoeuvre‐Lès‐Nancy, France, Fax: +33‐3‐83684979
| | - Yves Fort
- Groupe SOR, SRSMC, CNRS, Nancy Université, Faculté des Sciences, Boulevard des Aiguillettes, 54506 Vandoeuvre‐Lès‐Nancy, France, Fax: +33‐3‐83684979
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21
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Nakaike Y, Hayashi D, Nishiwaki N, Tobe Y, Ariga M. Formylnitroenamines: useful building blocks for nitrated pyridones and aminopyridines with functional groups. Org Biomol Chem 2009; 7:325-34. [PMID: 19109678 DOI: 10.1039/b815306j] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
beta-formyl-beta-nitroenamines possess both an electrophilic formyl group and a nucleophilic amino group and, therefore, serve as C3N1 building blocks having a nitro group to afford nitropyridones and aminonitropyridines with a functional group at the 3-position. Upon treatment with malonic acid derivatives or beta-keto esters, nitropyridones were obtained, whereas reactions with functionalized acetonitriles afford aminonitropyridines, via a formal transfer of an alkyl group from the ring nitrogen to the imino group. These procedures provide practical and useful methods for preparation of heterocycles with a nitro group.
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Affiliation(s)
- Yumi Nakaike
- Division of Frontier Materials Science, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan
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22
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Majumdar KC, Debnath P, Chottopadhyay SK. Aryl Radical Cyclization: Regioselective Synthesis of 6a,7,8,12b‐Tetrahydro‐6H‐chromeno[3,4‐c]quinolin‐6‐one. SYNTHETIC COMMUN 2008. [DOI: 10.1080/00397910801982191] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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23
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Doudouh A, Gros PC, Fort Y, Woltermann C. TMSCH2Li–LiDMAE: a new nonnucleophilic reagent for C-2 lithiation of halopyridines. Tetrahedron 2006. [DOI: 10.1016/j.tet.2006.04.059] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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24
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25
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Gotchev DB, Comins DL. Novel heterocyclic systems. Synthesis of 2,7-dimethyl-10-oxa-1,8-diaza-anthracen-9-one and derivatives. Tetrahedron 2004. [DOI: 10.1016/j.tet.2004.09.111] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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26
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An efficient one-pot synthesis of annulated pyridines utilising a directed ortho-metallation/transmetallation approach. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2003.12.096] [Citation(s) in RCA: 15] [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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27
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Andrés JI, Alonso JM, Fernández J, Iturrino L, Martínez P, Meert TF, Sipido VK. 2-(Dimethylaminomethyl)-tetrahydroisoxazolopyridobenzazepine derivatives. Synthesis of a new 5-HT(2C) antagonist with potential anxiolytic properties. Bioorg Med Chem Lett 2002; 12:3573-7. [PMID: 12443779 DOI: 10.1016/s0960-894x(02)00796-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Following the program started at Johnson & Johnson Pharmaceutical Research & Development searching for 5-HT(2A/2C) antagonists, we now report on the synthesis of 2-(dimethylaminomethyl)-2,3,3a,8-tetrahydroisoxazolo[3,2-a]pyrido[3,4-c]-[2]benzazepine and 2-(dimethylaminomethyl)-2,3,3a,8-tetrahydroisoxazolo[3,2-a]pyrido[3,2-c]-[2]benzazepine. A new method for the synthesis of pyridobenzazepines is described as well. The affinities for several receptors as well as the mCPP antagonistic activity of the compounds synthesised are described.
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Affiliation(s)
- J Ignacio Andrés
- Johnson & Johnson Pharmaceutical Research & Development, Division of Janssen-Cilag, Medicinal Chemistry Department, Jarama s/n, 45007 Toledo, Spain.
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28
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Bouillon A, Lancelot JC, Collot V, Bovy PR, Rault S. Synthesis of novel halopyridinylboronic acids and esters. Part 2: 2,4, or 5-Halopyridin-3-yl-boronic acids and esters. Tetrahedron 2002. [DOI: 10.1016/s0040-4020(02)00283-1] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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29
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Moseley JD, Moss WO, Welham MJ. Investigation of an Alternative Route to ZD3638 and Cost-Benefit Analysis Comparison of Raw Materials with the Previous Route. Org Process Res Dev 2001. [DOI: 10.1021/op0000935] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jonathan D. Moseley
- AstraZeneca, Process Research and Development, Avlon Works, Severn Road, Hallen, Bristol BS10 7ZE, U.K
| | - William O. Moss
- AstraZeneca, Process Research and Development, Avlon Works, Severn Road, Hallen, Bristol BS10 7ZE, U.K
| | - Matthew J. Welham
- AstraZeneca, Process Research and Development, Avlon Works, Severn Road, Hallen, Bristol BS10 7ZE, U.K
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30
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31
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Trécourt F, Breton G, Bonnet V, Mongin F, Marsais F, Quéguiner G. New Syntheses of Substituted Pyridines via Bromine–Magnesium Exchange. Tetrahedron 2000. [DOI: 10.1016/s0040-4020(00)00027-2] [Citation(s) in RCA: 88] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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32
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Trécourt F, Mallet M, Mongin F, Quéguiner G. Synthesis of 11H-Pyrido[2,3-a]carbazoles and 6H-Pyrido[3,2-b]carbazoles from 8-methoxy bromoquinolines. Tetrahedron 1995. [DOI: 10.1016/0040-4020(95)00726-o] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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33
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Read MW, Ray PS. Synthesis of a 1,8-naphthyridin-5-one derivativeviaan intramolecular 1,3-dipolar cycloaddition reaction. J Heterocycl Chem 1995. [DOI: 10.1002/jhet.5570320531] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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34
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Cochennec C, Rocca P, Marsais F, Godard A, Quéguiner G. Nucleophilic addition of lithio derivatives to 1-substituted benzo[c][2,7]naphthyridines (2,9-diazaphenanthrenes). ACTA ACUST UNITED AC 1995. [DOI: 10.1039/p19950000979] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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35
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Mongin O, Rocca P, Thomas-dit-Dumont L, Trécourt F, Marsais F, Godard A, Quéguiner G. Metallation of pyridine N-oxides and application to synthesis. ACTA ACUST UNITED AC 1995. [DOI: 10.1039/p19950002503] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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36
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Synthesis of heterocyclic compounds containing three contiguous hydrogen bonding sites in all possible arrangements. Tetrahedron 1995. [DOI: 10.1016/0040-4020(94)00922-h] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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37
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38
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A short entry into the pyrido[2,3-b]indole ring system. Synthesis of the tetracyclic segment of the marine antitumor agents: Grossularines-1 and -2. Tetrahedron Lett 1993. [DOI: 10.1016/s0040-4039(00)60362-3] [Citation(s) in RCA: 54] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Queguiner G, Marsais F, Snieckus V, Epsztajn J. Directed Metalation of Pi-Deficient Azaaromatics: Strategies of Functionalization of Pyridines, Quinolines, and Diazines. ADVANCES IN HETEROCYCLIC CHEMISTRY VOLUME 52 1991. [DOI: 10.1016/s0065-2725(08)60965-4] [Citation(s) in RCA: 201] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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