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Szabo M, Kowalczyk W, Tarasova A, Andrade J, Be CL, Mulder R, White J, Meyer AG, Schwab KE, Cartledge K, Le TC, Arachchilage AW, Wang X, Hoffman R, Nilsson SK, Haylock DN, Winkler DA. Potent In Vitro Peptide Antagonists of the Thrombopoietin Receptor as Potential Myelofibrosis Drugs. Adv Therap 2021. [DOI: 10.1002/adtp.202000241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Monika Szabo
- CSIRO Manufacturing Research Way Clayton 3168 Australia
| | | | - Anna Tarasova
- CSIRO Manufacturing Research Way Clayton 3168 Australia
| | | | - Cheang Ly Be
- CSIRO Manufacturing Research Way Clayton 3168 Australia
| | - Roger Mulder
- CSIRO Manufacturing Research Way Clayton 3168 Australia
| | - Jacinta White
- CSIRO Manufacturing Research Way Clayton 3168 Australia
| | - Adam G. Meyer
- CSIRO Manufacturing Research Way Clayton 3168 Australia
| | | | | | - Tu C. Le
- School of Engineering RMIT University Melbourne 3000 Australia
| | | | - Xiaoli Wang
- Icahn School of Medicine Mt Sinai School of Medicine New York NY 10029 USA
| | - Ronald Hoffman
- Icahn School of Medicine Mt Sinai School of Medicine New York NY 10029 USA
| | - Susan K. Nilsson
- CSIRO Manufacturing Research Way Clayton 3168 Australia
- Australian Regenerative Medicine Institute Monash University Melbourne 3800 Australia
| | - David N. Haylock
- La Trobe Institute for Molecular Science La Trobe University Kingsbury Drive Bundoora 3086 Australia
| | - David A. Winkler
- CSIRO Manufacturing Research Way Clayton 3168 Australia
- La Trobe Institute for Molecular Science La Trobe University Kingsbury Drive Bundoora 3086 Australia
- Monash Institute of Pharmaceutical Sciences Monash University 392 Royal Parade Parkville 3052 Australia
- School of Pharmacy University of Nottingham Nottingham NG7 2RD UK
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Bahou KA, Braddock DC, Meyer AG, Savage GP. Relay Cross Metathesis for the Iterative Construction of Terpenoids and Synthesis of a Diterpene-Benzoate Macrolide of Biogenetic Relevance to the Bromophycolides. Org Lett 2020; 22:3176-3179. [PMID: 32227974 PMCID: PMC7171603 DOI: 10.1021/acs.orglett.0c00935] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
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We report a relay
cross metathesis (ReXM) reaction for the construction
of terpenoids in an iterative protocol. The protocol features the
cross metathesis of a relay-actuated Δ6,7-functionalized
C10-monoterpenoid alcohol with C10-monoterpenoid
citral to form a C15-sesquiterpene. Subsequent functional
group manipulation allows for the method to be repeated in an iterative
fashion. The method is used for the synthesis of a diterpene-benzoate
macrolide of biogenetic relevance to the bromophycolide family of
natural products.
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Affiliation(s)
- Karim A Bahou
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, London W12 0BZ, United Kingdom
| | - D Christopher Braddock
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, London W12 0BZ, United Kingdom
| | - Adam G Meyer
- CSIRO Manufacturing, Jerry Price Laboratory, Research Way, Clayton, Victoria 3168, Australia
| | - G Paul Savage
- CSIRO Manufacturing, Jerry Price Laboratory, Research Way, Clayton, Victoria 3168, Australia
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Bahou KA, Braddock DC, Meyer AG, Savage GP, Shi Z, He T. A Relay Strategy Actuates Pre-Existing Trisubstituted Olefins in Monoterpenoids for Cross-Metathesis with Trisubstituted Alkenes. J Org Chem 2020; 85:4906-4917. [PMID: 32191466 PMCID: PMC7145354 DOI: 10.1021/acs.joc.0c00067] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A retrosynthetic disconnection-reconnection analysis of epoxypolyenes-substrates that can undergo cyclization to podocarpane-type tricycles-reveals relay-actuated Δ6,7-functionalized monoterpenoid alcohols for ruthenium benzylidene catalyzed olefin cross-metathesis with homoprenyl benzenes. Successful implementation of this approach provided several epoxypolyenes as expected (E/Z, ca. 2-3:1). The method is further generalized for the cross-metathesis of pre-existing trisubstituted olefins in other relay-actuated Δ6,7-functionalized monoterpenoid alcohols with various other trisubstituted alkenes to form new trisubstituted olefins. Epoxypolyene cyclization of an enantiomerically pure, but geometrically impure, epoxypolyene substrate provides an enantiomerically pure, trans-fused, podocarpane-type tricycle (from the E-geometrical isomer).
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Affiliation(s)
- Karim A Bahou
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, 80 Wood Lane, London W12 0BZ, U.K
| | - D Christopher Braddock
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, 80 Wood Lane, London W12 0BZ, U.K
| | - Adam G Meyer
- CSIRO Manufacturing, Jerry Price Laboratory, Research Way, Clayton 3168, Victoria, Australia
| | - G Paul Savage
- CSIRO Manufacturing, Jerry Price Laboratory, Research Way, Clayton 3168, Victoria, Australia
| | - Zhensheng Shi
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, 80 Wood Lane, London W12 0BZ, U.K
| | - Tianyou He
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, 80 Wood Lane, London W12 0BZ, U.K
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Wales SM, Rivinoja DJ, Gardiner MG, Bird MJ, Meyer AG, Ryan JH, Hyland CJT. Benzoazepine-Fused Isoindolines via Intramolecular (3 + 2)-Cycloadditions of Azomethine Ylides with Dinitroarenes. Org Lett 2019; 21:4703-4708. [PMID: 31188010 DOI: 10.1021/acs.orglett.9b01580] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Aminobenzaldehydes bearing a pendant 3,5-dinitrophenyl group react thermally with N-substituted α-amino acids to form unprecedented benzoazepine-fused isoindolines. The reaction proceeds via a dearomatization/rearomatization sequence involving an intramolecular (3 + 2)-cycloaddition between the in situ formed azomethine ylide and the dinitroarene. Various glycine derivatives are tolerated as well as branched substrates based on cyclic, α-mono-, and α,α-disubstituted amino acids, giving single diastereomers in many cases. The method is scalable and gives products with a nitro group ready for further manipulation.
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Affiliation(s)
- Steven M Wales
- School of Chemistry and Molecular Bioscience , University of Wollongong , Wollongong , NSW 2522 , Australia
| | - Daniel J Rivinoja
- School of Chemistry and Molecular Bioscience , University of Wollongong , Wollongong , NSW 2522 , Australia
| | - Michael G Gardiner
- School of Natural Sciences - Chemistry , University of Tasmania , Hobart , Tasmania 7001 , Australia
| | - Melissa J Bird
- School of Chemistry and Molecular Bioscience , University of Wollongong , Wollongong , NSW 2522 , Australia
| | - Adam G Meyer
- CSIRO Biomedical Manufacturing , Ian Wark Laboratory , Bayview Avenue , Clayton , Victoria 3168 , Australia
| | - John H Ryan
- CSIRO Biomedical Manufacturing , Ian Wark Laboratory , Bayview Avenue , Clayton , Victoria 3168 , Australia
| | - Christopher J T Hyland
- School of Chemistry and Molecular Bioscience , University of Wollongong , Wollongong , NSW 2522 , Australia
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D'Souza AM, Rivinoja DJ, Mulder RJ, White JM, Meyer AG, Hyland CJT, Ryan JH. Competitive 1,3-Dipolar Cycloaddition Reactions of an Azomethine Ylide with Aromatic and Carbonyl Groups of Nitro-Substituted Isatoic Anhydrides. Aust J Chem 2018. [DOI: 10.1071/ch18196] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
A study of the reactivity of a non-stabilised azomethine ylide, derived from N-(methoxymethyl)-N-(trimethylsilylmethyl)benzylamine, with nitro-substituted isatoic anhydrides was undertaken. N-Methyl-4-nitroisatoic anhydride underwent a 1,3-dipolar cycloaddition reaction exclusively at the isatoic anhydride C1-carbonyl group, followed by decarboxylative rearrangement to yield a benzo-1,3-diazepin-5-one derivative. In contrast, N-methyl-5-nitroisatoic anhydride underwent competing cycloaddition processes to the isatoic anhydride C1-carbonyl group and to the nitro-substituted aromatic ring. The dearomative addition reaction resulted in the formation of novel tetracyclic products.
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Abstract
A series of prenyl-containing malonates are kinetically benchmarked against the standard allyl-containing congeners using a ruthenium benzylidene precatalyst for ring-closing metatheses. The prenyl grouping is found to be a superior acceptor olefin compared to an allyl group in RCM processes with ruthenium alkylidenes derived from terminal alkenes. The prenyl group is also found to be a highly competent acceptor for a ruthenium alkylidene derived from a 1,1-disubstituted olefin in a RCM process.
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Affiliation(s)
- Karim A Bahou
- Department of Chemistry, Imperial College London , South Kensington, London SW7 2AZ, U.K
| | - D Christopher Braddock
- Department of Chemistry, Imperial College London , South Kensington, London SW7 2AZ, U.K
| | - Adam G Meyer
- CSIRO Manufacturing, Private Bag 10, Clayton South VIC 3169, Australia
| | - G Paul Savage
- CSIRO Manufacturing, Private Bag 10, Clayton South VIC 3169, Australia
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Freemont JA, Littler SW, Hutt OE, Mauger S, Meyer AG, Winkler DA, Kerr MG, Ryan JH, Cole HF, Duggan PJ. Molecular Markers for Pyrethrin Autoxidation in Stored Pyrethrum Crop: Analysis and Structure Determination. J Agric Food Chem 2016; 64:7134-41. [PMID: 27599033 DOI: 10.1021/acs.jafc.6b02959] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Pyrethrum is a natural insecticide extracted from Tanacetum cinerariifolium. Six esters, the pyrethrins, are responsible for the extract's insecticidal activity. The oxidative degradation of pyrethrins through contact with aerial oxygen is a potential cause of pyrethrin losses during pyrethrum manufacture. Described here is the first investigation of the autoxidation chemistry of the six pyrethrin esters isolated from pyrethrum. It was found that pyrethrins I and II, the major pyrethrin esters present in pyrethrum, undergo autoxidation more readily than the minor pyrethrin esters, the jasmolins and cinerins. Chromatographic analysis of pyrethrin I and II autoxidation mixtures showed some correlation with a similar analysis performed on extracts from T. cinerariifolium crop, which had been stored for 12 weeks without added antioxidants. Two pyrethrin II autoxidation products were isolated, characterized, and shown to be present in extracts of stored T. cinerariifolium crop, confirming that autoxidation of pyrethrin esters does occur during crop storage.
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Affiliation(s)
- Jamie A Freemont
- CSIRO Manufacturing, Bag 10, Clayton South, Victoria 3169, Australia
| | - Stuart W Littler
- CSIRO Manufacturing, Bag 10, Clayton South, Victoria 3169, Australia
| | - Oliver E Hutt
- CSIRO Manufacturing, Bag 10, Clayton South, Victoria 3169, Australia
| | - Stephanie Mauger
- CSIRO Manufacturing, Bag 10, Clayton South, Victoria 3169, Australia
- Institut de Recherche de Chimie Paris, CNRS - Chimie ParisTech , 11 rue Pierre et Marie Curie, 75005 Paris, France
| | - Adam G Meyer
- CSIRO Manufacturing, Bag 10, Clayton South, Victoria 3169, Australia
| | - David A Winkler
- CSIRO Manufacturing, Bag 10, Clayton South, Victoria 3169, Australia
- School of Chemical and Physical Sciences, Flinders University , Adelaide, South Australia 5042, Australia
| | - Maurice G Kerr
- Botanical Resources Australia , 44-46 Industrial Drive, Ulverstone, Tasmania 7315, Australia
| | - John H Ryan
- CSIRO Manufacturing, Bag 10, Clayton South, Victoria 3169, Australia
| | - Helen F Cole
- Botanical Resources Australia , 44-46 Industrial Drive, Ulverstone, Tasmania 7315, Australia
| | - Peter J Duggan
- CSIRO Manufacturing, Bag 10, Clayton South, Victoria 3169, Australia
- School of Chemical and Physical Sciences, Flinders University , Adelaide, South Australia 5042, Australia
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8
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Meyer AG, Ryan JH. 1,3-Dipolar Cycloaddition Reactions of Azomethine Ylides with Carbonyl Dipolarophiles Yielding Oxazolidine Derivatives. Molecules 2016; 21:molecules21080935. [PMID: 27455230 PMCID: PMC6274470 DOI: 10.3390/molecules21080935] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Revised: 07/02/2016] [Accepted: 07/06/2016] [Indexed: 12/19/2022] Open
Abstract
We provide a comprehensive account of the 1,3-dipolar cycloaddition reactions of azomethine ylides with carbonyl dipolarophiles. Many different azomethine ylides have been studied, including stabilized and non-stabilized ylides. Of the carbonyl dipolarophiles, aldehydes including formaldehyde are the most studied, although there are now examples of cycloadditions with ketones, ketenes and carboxyl systems, in particular isatoic anhydrides and phthalic anhydrides. Intramolecular cycloadditions with esters can also occur under certain circumstances. The oxazolidine cycloadducts undergo a range of reactions triggered by the ring-opening of the oxazolidine ring system.
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Affiliation(s)
- Adam G Meyer
- CSIRO Manufacturing, Bag 10, Clayton South MDC, Victoria 3169, Australia.
| | - John H Ryan
- CSIRO Manufacturing, Bag 10, Clayton South MDC, Victoria 3169, Australia.
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Lim Z, Duggan PJ, Wan SS, Lessene G, Meyer AG, Tuck KL. Exploiting the Biginelli reaction: nitrogen-rich pyrimidine-based tercyclic α-helix mimetics. Tetrahedron 2016. [DOI: 10.1016/j.tet.2015.12.044] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Santos H, Distiller A, D'Souza AM, Arnoux Q, White JM, Meyer AG, Ryan JH. 1,3-Dipolar cycloaddition reactions of phthalic anhydrides with an azomethine ylide. Org Chem Front 2015. [DOI: 10.1039/c5qo00062a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of phthalic anhydrides underwent a 1,3-dipolar cycloaddition reaction with N-benzylazomethine ylide to produce unstable spiro(isobenzofuran-1,5′-oxazolidin)-3-ones, which underwent a subsequent reductive ring-opening reaction to afford 1(3H)-isobenzofuranones.
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Affiliation(s)
- Hugo Santos
- CSIRO Manufacturing Flagship
- Clayton South
- Australia
| | | | | | | | - Jonathan M. White
- School of Chemistry
- Bio21 Institute
- University of Melbourne
- Parkville
- Australia
| | | | - John H. Ryan
- CSIRO Manufacturing Flagship
- Clayton South
- Australia
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Lim Z, Duggan PJ, Meyer AG, Tuck KL. An iterative in silico and modular synthetic approach to aqueous soluble tercyclic α-helix mimetics. Org Biomol Chem 2014; 12:4432-44. [DOI: 10.1039/c4ob00647j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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D'Souza AM, Spiccia N, Basutto J, Jokisz P, Wong LSM, Meyer AG, Holmes AB, White JM, Ryan JH. 1,3-Dipolar cycloaddition-decarboxylation reactions of an azomethine ylide with isatoic anhydrides: formation of novel benzodiazepinones. Org Lett 2010; 13:486-9. [PMID: 21175141 DOI: 10.1021/ol102824k] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A nonstabilized azomethine ylide reacts with a wide range of substituted isatoic anhydrides to afford novel 1,3-benzodiazepin-5-one derivatives, which are generally isolated in high yield. The transformations involve 1,3-dipolar cycloaddition reactions of the ylide with the anhydrides to give transient, and in a representative case spectroscopically observable, oxazolidine intermediates that undergo ring-opening-decarboxylation-ring-closing reaction cascades to yield the 1,3-benzodiazepin-5-one products.
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Affiliation(s)
- Asha M D'Souza
- CSIRO, Division of Materials Science and Engineering, Bag 10, Clayton South, Victoria 3169, Australia
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16
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Lee AE, Grace MR, Meyer AG, Tuck KL. Fluorescent Zn2+ chemosensors, functional in aqueous solution under environmentally relevant conditions. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2009.12.069] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Carver JA, Duggan PJ, Ecroyd H, Liu Y, Meyer AG, Tranberg CE. Carboxymethylated-kappa-casein: a convenient tool for the identification of polyphenolic inhibitors of amyloid fibril formation. Bioorg Med Chem 2009; 18:222-8. [PMID: 19931462 DOI: 10.1016/j.bmc.2009.10.063] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2009] [Revised: 10/29/2009] [Accepted: 10/30/2009] [Indexed: 11/19/2022]
Abstract
Reduced and carboxymethylated-kappa-casein (RCM-kappa-CN) is a milk-derived amyloidogenic protein that readily undergoes nucleation-dependent aggregation and amyloid fibril formation via a similar pathway to disease-specific amyloidogenic peptides like amyloid beta (Abeta), which is associated with Alzheimer's disease. In this study, a series of flavonoids, many known to be inhibitors of Abeta fibril formation, were screened for their ability to inhibit RCM-kappa-CN fibrilisation, and the results were compared with literature data on Abeta inhibition. Flavonoids that had a high degree of hydroxylation and molecular planarity gave good inhibition of RCM-kappa-CN fibril formation. IC(50) values were between 10- and 200-fold higher with RCM-kappa-CN than literature results for Abeta fibril inhibition, however, with few exceptions, they showed a similar trend in potency. The convenience and reproducibility of the RCM-kappa-CN assay make it an economic alternative first screen for Abeta inhibitory activity, especially for use with large compound libraries.
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Affiliation(s)
- John A Carver
- School of Chemistry and Physics, The University of Adelaide, Adelaide, South Australia 5005, Australia
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Aljofan M, Sganga ML, Lo MK, Rootes CL, Porotto M, Meyer AG, Saubern S, Moscona A, Mungall BA. Antiviral activity of gliotoxin, gentian violet and brilliant green against Nipah and Hendra virus in vitro. Virol J 2009; 6:187. [PMID: 19889218 PMCID: PMC2781006 DOI: 10.1186/1743-422x-6-187] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2009] [Accepted: 11/04/2009] [Indexed: 12/14/2022] Open
Abstract
Background Using a recently described monolayer assay amenable to high throughput screening format for the identification of potential Nipah virus and Hendra virus antivirals, we have partially screened a low molecular weight compound library (>8,000 compounds) directly against live virus infection and identified twenty eight promising lead molecules. Initial single blind screens were conducted with 10 μM compound in triplicate with a minimum efficacy of 90% required for lead selection. Lead compounds were then further characterised to determine the median efficacy (IC50), cytotoxicity (CC50) and the in vitro therapeutic index in live virus and pseudotype assay formats. Results While a number of leads were identified, the current work describes three commercially available compounds: brilliant green, gentian violet and gliotoxin, identified as having potent antiviral activity against Nipah and Hendra virus. Similar efficacy was observed against pseudotyped Nipah and Hendra virus, vesicular stomatitis virus and human parainfluenza virus type 3 while only gliotoxin inhibited an influenza A virus suggesting a non-specific, broad spectrum activity for this compound. Conclusion All three of these compounds have been used previously for various aspects of anti-bacterial and anti-fungal therapy and the current results suggest that while unsuitable for internal administration, they may be amenable to topical antiviral applications, or as disinfectants and provide excellent positive controls for future studies.
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Affiliation(s)
- Mohamad Aljofan
- Australian Animal Health Laboratory, CSIRO Livestock Industries, Geelong, Australia.
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Aljofan M, Saubern S, Meyer AG, Marsh G, Meers J, Mungall BA. Characteristics of Nipah virus and Hendra virus replication in different cell lines and their suitability for antiviral screening. Virus Res 2009; 142:92-9. [PMID: 19428741 DOI: 10.1016/j.virusres.2009.01.014] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2008] [Revised: 01/12/2009] [Accepted: 01/20/2009] [Indexed: 11/28/2022]
Abstract
We have recently described the development and validation of a high throughput screening assay suitable for henipavirus antiviral identification. While we are confident this assay is robust and effective, we wished to investigate assay performance in a range of alternative cell lines to determine if assay sensitivity and specificity could be improved. We evaluated ten different cell lines for their susceptibility to Hendra and Nipah virus infection and their sensitivity of detection of the effects of the broad spectrum antiviral, ribavirin and nine novel antivirals identified using our initial screening approach. Cell lines were grouped into three categories with respect to viral replication. Virus replicated best in Vero and BSR cells, followed by Hep-2, HeLa, BHK-21 and M17 cells. The lowest levels of RNA replication and viral protein expression were observed in BAEC, MMEC, A549 and ECV304 cells. Eight cell lines appeared to be similarly effective at discriminating the antiviral effects of ribavirin (<2.7-fold difference). The two cells lines most sensitive to the effect of ribavirin (ECV304 and BAEC) also displayed the lowest levels of viral replication while Vero cells were the least sensitive suggesting excess viral replication may limit drug efficacy and cell lines which limit viral replication may result in enhanced antiviral efficacy. However, there was no consistent trend observed with the other nine antivirals tested. While improvements in antiviral sensitivity in other cell lines may indicate an important role in future HTS assays, the slightly lower sensitivity to antiviral detection in Vero cells has inherent advantages in reducing the number of partially effective lead molecules identified during initial screens. Comparison of a panel of 54 novel antiviral compounds identified during routine screening of an in-house compound library in Vero, BHK-21 and BSR cells suggests no clear advantage of screening in either cell type.
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Affiliation(s)
- Mohamad Aljofan
- Australian Animal Health Laboratory, CSIRO Livestock Industries, Geelong, Australia
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20
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Ali A, Altamore TM, Bliese M, Fisara P, Liepa AJ, Meyer AG, Nguyen O, Sargent RM, Sawutz DG, Winkler DA, Winzenberg KN, Ziebell A. Parasiticidal 2-alkoxy- and 2-aryloxyiminoalkyl trifluoromethanesulfonanilides. Bioorg Med Chem Lett 2007; 18:252-5. [PMID: 18006308 DOI: 10.1016/j.bmcl.2007.10.090] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2007] [Revised: 10/22/2007] [Accepted: 10/25/2007] [Indexed: 11/29/2022]
Abstract
A series of novel 2-alkoxy- and 2-aryloxyiminoalkyl trifluoromethanesulfonanilide derivatives have shown significant in vitro parasiticidal activity against the ectoparasites Ctenocephalides felis and Rhipicephalus sanguineus. A number of these compounds also displayed significant in vitro endoparasite activity against the nematode Haemonchus contortus.
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Affiliation(s)
- Abdelselam Ali
- CSIRO Molecular and Health Technologies, Bag 10, Clayton South, Vic. 3169, Australia
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Crisp GT, Meyer AG. Palladium-catalyzed, carbonylative, intramolecular coupling of hydroxyvinyl triflates. Synthesis of substituted .alpha.,.beta.-butenolides. J Org Chem 2002. [DOI: 10.1021/jo00051a055] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Meyer AG, Dai L, Chen Q, Easton CJ, Xia L. Selective adsorption of nitro-substituted aromatics and accelerated hydrolysis of 4-nitrophenyl acetate on carbon surfaces. NEW J CHEM 2001. [DOI: 10.1039/b101963p] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Meyer AG, Albers FW, De Visscher AV, Tenvergert EM. Validation of hearing results in tympanoplasty: a preliminary report. Acta Otorhinolaryngol Belg 1999; 52:313-6. [PMID: 9914803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
In the otological literature, the results of middle ear surgery are frequently reported by closure of the air-bone gap and improvement of the air-conduction threshold in dB HL. These parameters are valid as a reflection of the technical success, but do not evaluate the effect of surgery on binaural hearing. In the literature two methods have been proposed for predicting patient benefit in reconstructive middle ear surgery: the Rule of Thumb and the Glasgow Benefit Plot. Both methods are based on the arbitrary cut-off level of 30 dB HL for normal or socially acceptable hearing. However, a reliable preoperative prediction of patient benefit can only be made after validation of the definition of normal or socially acceptable hearing expressed in dB HL by means of a questionnaire measuring the limitations of adequate hearing. A clear relationship is found between the subjective hearing ability and the air-conduction thresholds that supports 30 dB HL as the cut-off level for normal or socially acceptable hearing. Further validation of this cut-off level in a more extensive prospective study is needed to provide a significant prognosis for normal or socially acceptable hearing.
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Affiliation(s)
- A G Meyer
- Dept ENT, Head and Neck Surgery, University Hospital Groningen, The Netherlands
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Meyer AG, Easton CJ, Lincoln SF, Simpson GW. β-Cyclodextrin as a Scaffold for Supramolecular Chemistry, To Reverse the Regioselectivity of Nitrile Oxide Cycloadditions. J Org Chem 1998. [DOI: 10.1021/jo9817321] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Adam G. Meyer
- Research School of Chemistry, Australian National University, Canberra, ACT 0200, Australia, Department of Chemistry, University of Adelaide, Adelaide, SA 5005, Australia, and CSIRO Molecular Science, Private Bag 10, Clayton South MDC, Clayton, Vic 3169, Australia
| | - Christopher J. Easton
- Research School of Chemistry, Australian National University, Canberra, ACT 0200, Australia, Department of Chemistry, University of Adelaide, Adelaide, SA 5005, Australia, and CSIRO Molecular Science, Private Bag 10, Clayton South MDC, Clayton, Vic 3169, Australia
| | - Stephen F. Lincoln
- Research School of Chemistry, Australian National University, Canberra, ACT 0200, Australia, Department of Chemistry, University of Adelaide, Adelaide, SA 5005, Australia, and CSIRO Molecular Science, Private Bag 10, Clayton South MDC, Clayton, Vic 3169, Australia
| | - Gregory W. Simpson
- Research School of Chemistry, Australian National University, Canberra, ACT 0200, Australia, Department of Chemistry, University of Adelaide, Adelaide, SA 5005, Australia, and CSIRO Molecular Science, Private Bag 10, Clayton South MDC, Clayton, Vic 3169, Australia
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Meyer AG, Easton CJ, Lincoln SF, Simpson GW. A cyclodextrin to reverse the regioselectivity of nitrile oxide cycloaddition to a terminal alkene. Chem Commun (Camb) 1997. [DOI: 10.1039/a703575f] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Aumann R, Meyer AG, Fröhlich R. Steroid-Like Ring Skeletons by Cyclohexadiene Annulation to Enamines with Alkynylcarbene Complexes of Chromium and Tungsten via Pyran-2-ylidene Complexes. J Am Chem Soc 1996. [DOI: 10.1021/ja961020x] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Rudolf Aumann
- Organisch-Chemisches Institut der Universität Münster, Correnstrasse 40, D-48149 Münster, Germany
| | - Adam G. Meyer
- Organisch-Chemisches Institut der Universität Münster, Correnstrasse 40, D-48149 Münster, Germany
| | - Roland Fröhlich
- Organisch-Chemisches Institut der Universität Münster, Correnstrasse 40, D-48149 Münster, Germany
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Aumann R, Meyer AG, Fröhlich R. Organic Syntheses via Transition Metal Complexes. 86. Regioselective [C3+ C2] Cyclopentadiene Annulation to Enamines with Alkynylcarbene Complexes of Chromium and Tungsten as Novel C3Building Blocks. Organometallics 1996. [DOI: 10.1021/om960729+] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Meyer AG, Aumann R. Organic Syntheses via Transition Metal Complexes, 821: Highly Selective Cyclopentadiene Annulation to Enamines via a [3+2] Cycloaddition of Alkynylcarbene Chromium and Tungsten Complexes. Synlett 1995. [DOI: 10.1055/s-1995-5160] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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