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Su B, Zhang Z, Zhang S, Zhou Y, Tao H, Mai S. Rh-Catalyzed α-Arylation of Cyclic 1,3-Dicarbonyls with Benzocyclobutenols Enabled by a Cyclic Iodonium Ylide Strategy. Org Lett 2024; 26:4383-4387. [PMID: 38742769 DOI: 10.1021/acs.orglett.4c01417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2024]
Abstract
To date, the general and catalytic α-arylation of cyclic 1,3-dicarbonyls remains elusive. We now report the first Rh-catalyzed α-arylation of cyclic 1,3-dicarbonyls with benzocyclobutenols through a cyclic iodonium ylide strategy. Our strategy represents a good solution for the previously challenging α-arylation of cyclic 1,3-dicarbonyls with sterically demanding aryl partners, which is especially appropriate for structurally unique heteroaromatic 1,3-dicarbonyls. Our approach features mild conditions, readily available starting materials, high yields, excellent functional group-tolerance, and simple operation, providing expedient access toward medically important 2-aryl (hetero)cyclic 1,3-dicarbonyls. The practicality of this approach is demonstrated by the gram-scale synthesis, one-pot synthesis, and numerous downstream transformations.
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Affiliation(s)
- Borong Su
- School of Traditional Chinese Medicine, Southern Medical University, Guangzhou 510515, China
| | - Zhenwei Zhang
- School of Traditional Chinese Medicine, Southern Medical University, Guangzhou 510515, China
| | - Shangkun Zhang
- School of Traditional Chinese Medicine, Southern Medical University, Guangzhou 510515, China
| | - Yao Zhou
- Hubei Key Laboratory of Pollutant Analysis & Reuse Technology, College of Chemistry and Chemical Engineering, Hubei Normal University, Huangshi 435002, China
| | - Huaming Tao
- School of Traditional Chinese Medicine, Southern Medical University, Guangzhou 510515, China
- Guangdong Provincial Key Laboratory of Chinese Medicine Pharmaceutics, Guangzhou 510515, China
| | - Shaoyu Mai
- School of Traditional Chinese Medicine, Southern Medical University, Guangzhou 510515, China
- Guangdong Provincial Key Laboratory of Chinese Medicine Pharmaceutics, Guangzhou 510515, China
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2
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Hashimoto K, Kimura K, Ishida K, Morita E, Tanaka K, Hashimoto M. HIV-1 Integrase Inhibitor, Dihydroobionin B, and the Investigation of Its Extraordinary Specific Rotation. JOURNAL OF NATURAL PRODUCTS 2023; 86:2139-2144. [PMID: 37595279 DOI: 10.1021/acs.jnatprod.3c00353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/20/2023]
Abstract
Dihydroobionin B (1), a chiral congener of known obionin B, was isolated from Pseudocoleophoma sp. KT4119, a freshwater fungus collected from a submerged wood block in Kochi Prefecture, Japan, in 2020. The planar structure of 1 was characterized by mass and NMR spectral analysis and confirmed by density functional theory (DFT)-based chemical shift calculations. Its absolute structure was determined by electronic circular dichroism spectral analysis. Notably, 1 exhibited an extraordinarily large specific rotation [[α]20D +1080 (c 0.056, CHCl3)], which was verified by DFT-based specific rotation calculations. However, these calculations indicated that the sign of the specific rotation based on static analysis was insufficient to determine the absolute configuration in this case. Furthermore, Pseudocoleophoma KT4119 produced coleophomapyrones A (2) and B (3) and coleophomaldehyde A (4). While this is the first report of 2 isolated from a natural source, it has also been prepared previously using a synthetic approach. Compound 1 potently inhibited HIV type 1 integrase (IC50 = 0.44 μM) without significant cytotoxicity. Finally, docking experiments were conducted to propose a plausible mechanism for the behavior of 1.
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Affiliation(s)
- Kazuki Hashimoto
- Faculty of Agriculture and Life Science, Hirosaki University, 3-Bunkyo-cho, Hirosaki, 036-8561, Japan
| | - Kana Kimura
- Faculty of Agriculture and Life Science, Hirosaki University, 3-Bunkyo-cho, Hirosaki, 036-8561, Japan
| | - Kotaro Ishida
- The United Graduate School of Agricultural Sciences, Iwate University, Morioka 020-8550, Japan
| | - Eiji Morita
- Faculty of Agriculture and Life Science, Hirosaki University, 3-Bunkyo-cho, Hirosaki, 036-8561, Japan
| | - Kazuaki Tanaka
- Faculty of Agriculture and Life Science, Hirosaki University, 3-Bunkyo-cho, Hirosaki, 036-8561, Japan
| | - Masaru Hashimoto
- Faculty of Agriculture and Life Science, Hirosaki University, 3-Bunkyo-cho, Hirosaki, 036-8561, Japan
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3
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Xavier T, Pichon C, Presset M, Le Gall E, Condon S. Efficient Preparation of Methyl 2‐Oxo‐3‐aryl (heteroaryl)‐2
H
‐pyran‐5‐carboxylate via Pd‐Catalyzed Negishi Coupling. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100608] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Tania Xavier
- Université Paris-Est Créteil, CNRS Institut de Chimie et des Matériaux Paris-Est, UMR 7182 2-8 rue Henri Dunant 94320 Thiais France
| | - Christophe Pichon
- Université Paris-Est Créteil, CNRS Institut de Chimie et des Matériaux Paris-Est, UMR 7182 2-8 rue Henri Dunant 94320 Thiais France
| | - Marc Presset
- Université Paris-Est Créteil, CNRS Institut de Chimie et des Matériaux Paris-Est, UMR 7182 2-8 rue Henri Dunant 94320 Thiais France
| | - Erwan Le Gall
- Université Paris-Est Créteil, CNRS Institut de Chimie et des Matériaux Paris-Est, UMR 7182 2-8 rue Henri Dunant 94320 Thiais France
| | - Sylvie Condon
- Université Paris-Est Créteil, CNRS Institut de Chimie et des Matériaux Paris-Est, UMR 7182 2-8 rue Henri Dunant 94320 Thiais France
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4
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Gotsko MD, Saliy IV, Sobenina LN, Ushakov IA, Trofimov BA. From acylethynylpyrroles to pyrrole-pyrone ensembles in a one step. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2019.151126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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5
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Kurasawa K, Kwon E, Kuwahara S, Enomoto M. Bioinspired Total Synthesis of Delitschiapyrone A. Org Lett 2018; 20:4645-4648. [PMID: 30003791 DOI: 10.1021/acs.orglett.8b01932] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A bioinspired seven-step total synthesis of delitschiapyrone A was accomplished in 32% overall yield from commercially available 4-bromo-3,5-dimethoxybenzoic acid. The key step of the synthesis is an exclusively regioselective and diastereoselective reaction cascade consisting of the Diels-Alder reaction, α-ketol rearrangement, and cyclic hemiacetalization, achieved by simply stirring a heterogeneous mixture of two Diels-Alder substrates (putative biosynthetic intermediates) and water at 35 °C, directly furnishing the pentacyclic natural product in 75% yield.
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Affiliation(s)
- Kazuki Kurasawa
- Laboratory of Applied Bioorganic Chemistry, Graduate School of Agricultural Science , Tohoku University , 468-1 Aramaki Aza-Aoba , Aoba-ku , Sendai 980-8572 , Japan
| | - Eunsang Kwon
- Research and Analytical Center for Giant Molecules, Graduate School of Science , Tohoku University , 6-3 Aramaki Aza-Aoba , Aoba-ku , Sendai 980-8578 , Japan
| | - Shigefumi Kuwahara
- Laboratory of Applied Bioorganic Chemistry, Graduate School of Agricultural Science , Tohoku University , 468-1 Aramaki Aza-Aoba , Aoba-ku , Sendai 980-8572 , Japan
| | - Masaru Enomoto
- Laboratory of Applied Bioorganic Chemistry, Graduate School of Agricultural Science , Tohoku University , 468-1 Aramaki Aza-Aoba , Aoba-ku , Sendai 980-8572 , Japan
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6
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Microwave-assisted synthesis, molecular docking and antimicrobial activity of novel 2-(3-aryl,1-phenyl-1H-pyrazol-4-yl)-8H-pyrano[2,3-f]chromen-4-ones. Med Chem Res 2016. [DOI: 10.1007/s00044-016-1505-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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8
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Chen Z, Wang ZC, Yan XQ, Wang PF, Lu XY, Chen LW, Zhu HL, Zhang HW. Design, synthesis, biological evaluation and molecular modeling of dihydropyrazole sulfonamide derivatives as potential COX-1/COX-2 inhibitors. Bioorg Med Chem Lett 2015; 25:1947-51. [PMID: 25866240 DOI: 10.1016/j.bmcl.2015.03.022] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2015] [Revised: 02/21/2015] [Accepted: 03/10/2015] [Indexed: 10/23/2022]
Abstract
Novel dihydropyrazole sulfonamide derivatives (30-56) were designed, synthesized, and evaluated for their biological activities as COX-1 and COX-2 inhibitors. In vitro biological evaluation against three human tumor cell lines revealed that most target compounds showed antiproliferative activities. Among the compounds, compound 48 exhibited the most potent and selective COX-2 inhibitor (COX-2 IC50=0.33 μM; COX-1 IC50=68.49 μM) relative to the reference drugs celecoxib (IC50=0.052 μM). Docking simulation was performed to position compound 48 into the COX-2 active site and the result showed that compound 48 could bind well at the COX-2 active site and it indicated that compound 48 could be a potent and selective COX-2 inhibitor.
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Affiliation(s)
- Zhong Chen
- Department of Plastic and Burn Surgery, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 21003, People's Republic of China; State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing 210093, People's Republic of China
| | - Zhong-Chang Wang
- State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing 210093, People's Republic of China
| | - Xiao-Qiang Yan
- State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing 210093, People's Republic of China
| | - Peng-Fei Wang
- State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing 210093, People's Republic of China
| | - Xiao-Yuan Lu
- State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing 210093, People's Republic of China
| | - Long-Wang Chen
- State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing 210093, People's Republic of China
| | - Hai-Liang Zhu
- State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing 210093, People's Republic of China.
| | - Hong-Wei Zhang
- Department of Plastic and Burn Surgery, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 21003, People's Republic of China.
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10
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Chu XP, Zhou QF, Zhao S, Ge FF, Fu M, Chen JP, Lu T. Synthesis and biological evaluation of 3-amino-2-pyrones as selective cyclooxygenase-1 (COX-1) inhibitors. CHINESE CHEM LETT 2013. [DOI: 10.1016/j.cclet.2013.01.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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11
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Hopf H, Sherburn MS. Dendralene auf dem Vormarsch: kreuzkonjugierte Oligoene ermöglichen den schnellen Aufbau molekularer Komplexität. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201102987] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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12
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Hopf H, Sherburn MS. Dendralenes Branch Out: Cross-Conjugated Oligoenes Allow the Rapid Generation of Molecular Complexity. Angew Chem Int Ed Engl 2012; 51:2298-338. [DOI: 10.1002/anie.201102987] [Citation(s) in RCA: 134] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2011] [Revised: 09/12/2011] [Indexed: 11/11/2022]
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13
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Faidallah HM, Khan KA, Asiri AM. Synthesis and characterization of a novel series of benzenesulfonylurea and thiourea derivatives of 2H-pyran and 2H-pyridine-2-ones as antibacterial, antimycobacterial and antifungal agents. ACTA ACUST UNITED AC 2011. [DOI: 10.5155/eurjchem.2.2.243-250.257] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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14
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Lei X, Gao L, Ding Q, Peng Y, Wu J. Generation of diverse 2-pyrones via palladium-catalyzed site-selective Suzuki-Miyaura couplings of 3-bromo-4-tosyloxy-2-pyrone. Org Biomol Chem 2011; 9:6265-70. [DOI: 10.1039/c1ob05783a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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Moulton BE, Dong H, O'Brien CT, Duckett SB, Lin Z, Fairlamb IJS. A natural light induced regioselective 6π-electrocyclisation–oxidative aromatisation reaction: experimental and theoretical insights. Org Biomol Chem 2008; 6:4523-32. [PMID: 19039360 DOI: 10.1039/b811284c] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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16
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Fairlamb IJS, Kapdi AR, Lee AF, McGlacken GP, Weissburger F, de Vries AHM, Schmieder-van de Vondervoort L. Exploiting Noninnocent (E,E)-Dibenzylideneacetone (dba) Effects in Palladium(0)-Mediated Cross-Coupling Reactions: Modulation of the Electronic Properties of dba Affects Catalyst Activity and Stability in Ligand and Ligand-Free Reaction Systems. Chemistry 2006; 12:8750-61. [PMID: 16952128 DOI: 10.1002/chem.200600473] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The reactivity of palladium(0) complexes, [Pd(0) (2)(dba-n,n'-Z)(3)] (n,n'-Z=4,4'-F; 4,4'-CF(3); 4,4'-H; 4,4'-MeO) and [Pd(0)(dba-n,n'-Z)(2)] (n,n'-Z=4,4'-CF(3); 4,4'-H; 3,3',5,5'-OMe), used as precursor catalysts with suitable donor ligands (e.g. phosphines, N-heterocyclic carbenes), has been correlated in several palladium(0)-mediated cross-coupling processes. Increasing the electron density on the aryl moiety of the dba-n,n'-Z ligand increases the overall catalytic activity in the majority of these processes. This effect primarily derives from destabilization of the L(n)Pd(0)-eta(2)-dba interaction (in dpi-pi* synergic bonding, n=1 or 2), which ultimately increases the global concentration of catalytically active L(n)Pd(0) available for reaction with aryl halide in the first committed step in the general catalytic cycle(s) (oxidative addition). Decreasing electron density on the aryl moiety of the dba-n,n'-Z ligand stabilizes the Pd(0)-eta(2)-dba interaction, reducing catalytic activity. The specific type of dba-n,n'-Z ligand appears to also play a stabilizing role in the catalytic cycle, preventing Pd agglomeration, and increasing catalyst longevity. A subtle balance therefore exists between the L(n)Pd(0) concentration (and the associated catalytic activity) and catalyst longevity. Changing the type of dba-n,n'-Z ligand controls the concentration of L(n)Pd(0) and the rate of the oxidative addition step, and not other intimate steps within the catalytic cycle(s), for example, transmetallation (or carbopalladation) and reductive elimination. The role of dba-n,n'-Z ligands in Heck arylation is more convoluted and dependent on the alkene substrate employed, although trends have emerged. Changes in the structure of dba-n,n'-Z had a minimal affect on Buchwald-Hartwig aryl amination processes. A secondary Michael reaction of dba-n,n'-Z with amine and/or base effectively lessens its interference in the catalytic cycle.
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Affiliation(s)
- Ian J S Fairlamb
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK.
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17
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Reva I, Nowak M, Lapinski L, Fausto R. UV-induced photochemistry of methyl coumalate (methyl 2-pyrone-5-carboxylate) isolated in low-temperature inert matrices. Chem Phys Lett 2006. [DOI: 10.1016/j.cplett.2006.08.061] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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18
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Fairlamb IJS, Duhme-Klair AK, Lynam JM, Moulton BE, O'Brien CT, Sawle P, Hammad J, Motterlini R. η4-Pyrone iron(0)carbonyl complexes as effective CO-releasing molecules (CO-RMs). Bioorg Med Chem Lett 2006; 16:995-8. [PMID: 16289810 DOI: 10.1016/j.bmcl.2005.10.085] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2005] [Revised: 10/24/2005] [Accepted: 10/26/2005] [Indexed: 11/24/2022]
Abstract
The CO-releasing properties of iron(0)tricarbonyl complexes bearing a 2-pyrone ligand have been evaluated. In this report, we demonstrate that the intrinsic stability of the (eta4-2-pyrone)Fe(CO)3 complex influences the extent and rate of CO release, which is affected by the presence of a halogen substituent on the 2-pyrone ring. The cell viability index has been highlighted for the active carbon monoxide-releasing molecules (CO-RMs), demonstrating that these complexes and related derivatives are a promising new class of compounds with potential therapeutic applications.
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Affiliation(s)
- Ian J S Fairlamb
- Department of Chemistry, University of York, Heslington, York YO10 5DD, UK.
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19
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Jung ME, Novack AR. Formation of 3,4-dimethyl-2-pyrones from allene carboxylates and 2-silyloxydienes via 3-carboethoxyethylidene cyclobutanols. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.09.091] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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20
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Halogenated-2-pyrones in Sonogashira cross-coupling: limitations, optimisation and consequences for GC analysis of Pd-mediated reactions. Tetrahedron 2005. [DOI: 10.1016/j.tet.2005.07.102] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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21
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Collings JC, Parsons AC, Porrès L, Beeby A, Batsanov AS, Howard JAK, Lydon DP, Low PJ, Fairlamb IJS, Marder TB. Optical properties of donor-acceptor phenylene-ethynylene systems containing the 6-methylpyran-2-one group as an acceptor. Chem Commun (Camb) 2005:2666-8. [PMID: 15917913 DOI: 10.1039/b502781k] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Donor-acceptor phenylene ethynylene systems containing the 6-methylpyran-2-one group, synthesized via classic or microwave-assisted Sonogashira cross-coupling, exhibit pronounced solvatochromism in fluorescence suggesting a highly polar excited state; 4-[4-(4-N,N-dihexylaminophenylethynyl)phenylethynyl]-6-methylpyran-2-one has a fluorescence quantum yield >0.9 in cyclohexane.
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22
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Novel 2-pyrone synthesis via Michael addition of mandelic acid enolate to trans-1,2-diaroylethenes. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.09.052] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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23
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Fairlamb IJS, Lynam JM, Taylor IE, Whitwood AC. η1-Bound 2-Pyrone Complexes of Molybdenum and Iron: A Synthetic and Structural Study. Organometallics 2004. [DOI: 10.1021/om049523w] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ian J. S. Fairlamb
- Department of Chemistry, University of York, Heslington, York, U.K. YO10 5DD
| | - Jason M. Lynam
- Department of Chemistry, University of York, Heslington, York, U.K. YO10 5DD
| | - Ian E. Taylor
- Department of Chemistry, University of York, Heslington, York, U.K. YO10 5DD
| | - Adrian C. Whitwood
- Department of Chemistry, University of York, Heslington, York, U.K. YO10 5DD
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Sheibani H, Islami MR, Khabazzadeh H, Saidi K. A convenient one-pot synthesis of substituted 2-pyrone derivatives. Tetrahedron 2004. [DOI: 10.1016/j.tet.2004.05.025] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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25
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Rao PNP, Uddin MJ, Knaus EE. Design, Synthesis, and Structure−Activity Relationship Studies of 3,4,6-Triphenylpyran-2-ones as Selective Cyclooxygenase-2 Inhibitors. J Med Chem 2004; 47:3972-90. [PMID: 15267236 DOI: 10.1021/jm049939b] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A group of regioisomeric 3,4,6-triphenylpyran-2-ones with a MeSO(2) pharmacophore at the para-position of either a C-3 phenyl or a C-4 phenyl substituent on the central six-membered pyran-2-one ring were prepared and evaluated in vitro for their abilities to inhibit the isozymes COX-1 and COX-2. Structure-activity relationship (SAR) data, acquired by substituent modification at the para-position of the C-6 phenyl ring attached to the central pyranone, showed that 6-(4-methoxyphenyl)-3-(4-methanesulfonylphenyl)-4-phenylpyran-2-one (12e) was the most potent and selective COX-2 inhibitor (COX-2 IC(50) = 0.02 microM; COX-1 IC(50) > 100 microM) with a high COX-2 selectivity index (SI > 5000) relative to the reference drugs celecoxib (COX-2 IC(50) = 0.07 microM; SI = 474) and rofecoxib (COX-2 IC(50) = 0.50 microM; SI > 200). 6-(4-Methoxyphenyl)-3-(4-methanesulfonylphenyl)-4-phenylpyran-2-one (12e) was a more potent oral antiinflammatory agent (ID(50) = 5.6 mg/kg) than celecoxib (ID(50) = 10.8 mg/kg) in a carrageenan-induced rat paw edema assay. In a 4% NaCl-induced abdominal constriction assay, a 5 mg/kg oral dose of 12e exhibited good analgesic activity at different time intervals producing 37.5 and 69% inhibition of writhing at 30 and 60 min, respectively. In contrast, the corresponding 6-(4-methoxyphenyl)-4-(4-methanesulfonylphenyl)-3-phenylpyran-2-one regiosiomer (12o) was a less potent and selective COX-2 inhibitor (COX-2 IC(50) = 0.45 microM; SI = 70). A molecular modeling study for 12e indicated that the p-OMe substituent on the C-6 phenyl ring interacts with the COX-2 binding site amino acids Ile(345), Val(349), Leu(359), Leu(531), and Met(535) and that the OMe substituent may be responsible for proper orientation of the C-3 p-SO(2)Me-phenyl ring within the COX-2 secondary pocket (Gln(192), Arg(513), and Phe(518)). These results show that the COX-2 selectivity and potency of 3,4,6-triphenylpyranone regioisomers can be modulated by appropriate placement of the p-SO(2)Me pharmacophore on either the C-3 or C-4 phenyl moiety. In addition, electronic properties at the para-position of a C-6 phenyl substituent on the central pyranone ring govern COX-2 inhibitory potency and selectivity by controlling the orientation of the p-SO(2)Me pharmacophore within the COX-2 secondary pocket.
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Affiliation(s)
- P N Praveen Rao
- Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, T6G 2N8, Canada
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Niemelä EH, Lee AF, Fairlamb IJ. Important consequences for gas chromatographic analysis of the Sonogashira cross-coupling reaction. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.03.060] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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27
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