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Abstract
The readily available natural product stevioside provides a unique diterpene core structure that can be explored for small molecule library development by diversity-oriented synthesis and functional group transformations. Validation arrays were prepared from steviol, isosteviol, and related analogues, derived from stevioside, to produce over 90 compounds. These compounds were submitted to the NIH Molecular Libraries Small Molecule Repository for screening in the Molecular Libraries Screening Center Network. Micromolar hits were identified in multiple high-throughput assays for several library members. A cheminformatics analysis of the compounds was performed that verified the expected diversity and complexity of this set of compounds. The screening results indicate that scaffolds-derived natural products can provide screening hits against multiple target proteins.
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Affiliation(s)
- Trinh A. D. Holth
- Department of Medicinal Chemistry and Institute for Therapeutics Discovery and Development, College of Pharmacy, University of Minnesota, 717 Delaware Street Southeast, Minneapolis, Minnesota 55414, United States
| | - Michael A. Walters
- Department of Medicinal Chemistry and Institute for Therapeutics Discovery and Development, College of Pharmacy, University of Minnesota, 717 Delaware Street Southeast, Minneapolis, Minnesota 55414, United States
| | - Oliver E. Hutt
- Department of Medicinal Chemistry and Institute for Therapeutics Discovery and Development, College of Pharmacy, University of Minnesota, 717 Delaware Street Southeast, Minneapolis, Minnesota 55414, United States
| | - Gunda I. Georg
- Department of Medicinal Chemistry and Institute for Therapeutics Discovery and Development, College of Pharmacy, University of Minnesota, 717 Delaware Street Southeast, Minneapolis, Minnesota 55414, United States
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2
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Strover LT, Cantalice A, Lam JYL, Postma A, Hutt OE, Horne MD, Moad G. Electrochemical Behavior of Thiocarbonylthio Chain Transfer Agents for RAFT Polymerization. ACS Macro Lett 2019; 8:1316-1322. [PMID: 35651172 DOI: 10.1021/acsmacrolett.9b00598] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [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
Electrochemical activation of thiocarbonylthio reversible addition-fragmentation chain transfer (RAFT) agents (S=C(Z)S-R) is explored as a potential method for initiating RAFT polymerization under mild conditions without producing initiator-derived byproducts. Herein we apply cyclic voltammetry to establish a predominant reduction mechanism, where electrochemical reduction is coupled to an irreversible first-order chemical reaction. Structure-dependent trends in cyclic voltammograms (CVs), and comparison to absorption spectra, clarify the role of R- and Z-groups in determining reduction processes. The major reduction peak moves to more cathodic potentials in the series dithiobenzoates > trithiocarbonates > heteroaromatic dithiocarbamates > xanthates ∼ N-alkyl-N-aryldithiocarbamates, due to the Z-group influence on thiocarbonyl bond reactivity. More active (electron-withdrawing, radical stabilizing) R-groups shift the reduction peak anodically, in part due to their influence on the rate of the coupled chemical reaction. Analysis of CVs across a range of scan rates revealed that kinetic control over the reduction mechanism is influenced by both the charge transfer rate and chemical reaction rate.
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Affiliation(s)
| | - Alexis Cantalice
- CSIRO Manufacturing, Clayton, VIC 3168, Australia
- Chimie ParisTech, Paris 75005, France
| | - Jeff Y. L. Lam
- CSIRO Manufacturing, Clayton, VIC 3168, Australia
- Department of Chemistry, Faculty of Natural Sciences, Imperial College London, London SW7 2AZ, U.K
| | - Almar Postma
- CSIRO Manufacturing, Clayton, VIC 3168, Australia
| | | | | | - Graeme Moad
- CSIRO Manufacturing, Clayton, VIC 3168, Australia
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3
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Skinner-Adams TS, Fisher GM, Riches AG, Hutt OE, Jarvis KE, Wilson T, von Itzstein M, Chopra P, Antonova-Koch Y, Meister S, Winzeler EA, Clarke M, Fidock DA, Burrows JN, Ryan JH, Andrews KT. Cyclization-blocked proguanil as a strategy to improve the antimalarial activity of atovaquone. Commun Biol 2019; 2:166. [PMID: 31069275 PMCID: PMC6499835 DOI: 10.1038/s42003-019-0397-3] [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] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Accepted: 03/15/2019] [Indexed: 12/28/2022] Open
Abstract
Atovaquone-proguanil (Malarone®) is used for malaria prophylaxis and treatment. While the cytochrome bc1-inhibitor atovaquone has potent activity, proguanil's action is attributed to its cyclization-metabolite, cycloguanil. Evidence suggests that proguanil has limited intrinsic activity, associated with mitochondrial-function. Here we demonstrate that proguanil, and cyclization-blocked analogue tBuPG, have potent, but slow-acting, in vitro anti-plasmodial activity. Activity is folate-metabolism and isoprenoid biosynthesis-independent. In yeast dihydroorotate dehydrogenase-expressing parasites, proguanil and tBuPG slow-action remains, while bc1-inhibitor activity switches from comparatively fast to slow-acting. Like proguanil, tBuPG has activity against P. berghei liver-stage parasites. Both analogues act synergistically with bc1-inhibitors against blood-stages in vitro, however cycloguanil antagonizes activity. Together, these data suggest that proguanil is a potent slow-acting anti-plasmodial agent, that bc1 is essential to parasite survival independent of dihydroorotate dehydrogenase-activity, that Malarone® is a triple-drug combination that includes antagonistic partners and that a cyclization-blocked proguanil may be a superior combination partner for bc1-inhibitors in vivo.
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Affiliation(s)
- Tina S. Skinner-Adams
- Griffith Institute for Drug Discovery, Griffith University, Nathan, QLD 4111 Australia
| | - Gillian M. Fisher
- Griffith Institute for Drug Discovery, Griffith University, Nathan, QLD 4111 Australia
| | - Andrew G. Riches
- Commonwealth Scientific and Industrial Research Organization, Biomedical Manufacturing, Clayton, VIC 3168 Australia
| | - Oliver E. Hutt
- Commonwealth Scientific and Industrial Research Organization, Biomedical Manufacturing, Clayton, VIC 3168 Australia
| | - Karen E. Jarvis
- Commonwealth Scientific and Industrial Research Organization, Biomedical Manufacturing, Clayton, VIC 3168 Australia
| | - Tony Wilson
- Commonwealth Scientific and Industrial Research Organization, Biomedical Manufacturing, Clayton, VIC 3168 Australia
| | - Mark von Itzstein
- Institute for Glycomics, Griffith University Gold Coast Campus, Gold Coast, QLD 4222 Australia
| | - Pradeep Chopra
- Institute for Glycomics, Griffith University Gold Coast Campus, Gold Coast, QLD 4222 Australia
| | - Yevgeniya Antonova-Koch
- School of Medicine, University of California, San Diego, La Jolla, CA 92093 USA
- Present Address: California Institute for Biomedical Research (Calibr), La Jolla, CA 92037 USA
| | - Stephan Meister
- School of Medicine, University of California, San Diego, La Jolla, CA 92093 USA
- Present Address: Beckman Coulter Life Sciences in Indianapolis, Indianapolis, IN 46268 USA
| | | | - Mary Clarke
- Griffith Institute for Drug Discovery, Griffith University, Nathan, QLD 4111 Australia
| | - David A. Fidock
- Department of Microbiology and Immunology, and Division of Infectious Diseases, Department of Medicine, Columbia University Medical Center, New York, NY 10032 USA
| | - Jeremy N. Burrows
- Medicines for Malaria Venture (MMV), Route de Pré Bois 20, Geneva, 1215 Switzerland
| | - John H. Ryan
- Commonwealth Scientific and Industrial Research Organization, Biomedical Manufacturing, Clayton, VIC 3168 Australia
| | - Katherine T. Andrews
- Griffith Institute for Drug Discovery, Griffith University, Nathan, QLD 4111 Australia
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4
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Kowalczyk W, Sanchez J, Kraaz P, Hutt OE, Haylock DN, Duggan PJ. The binding of boronated peptides to low affinity mammalian saccharides. Pept Sci (Hoboken) 2018. [DOI: 10.1002/pep2.23101] [Citation(s) in RCA: 5] [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: 11/11/2022]
Affiliation(s)
| | - Julie Sanchez
- CSIRO Manufacturing, Bag 10; Clayton South Victoria 3169 Australia
- Institut de Recherche de Chimie Paris, CNRS - Chimie ParisTech, 11 rue Pierre et Marie Curie; Paris 75005 France
| | - Phillipe Kraaz
- CSIRO Manufacturing, Bag 10; Clayton South Victoria 3169 Australia
| | - Oliver E. Hutt
- CSIRO Manufacturing, Bag 10; Clayton South Victoria 3169 Australia
| | - David N. Haylock
- CSIRO Manufacturing, Bag 10; Clayton South Victoria 3169 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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5
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Kowalczyk W, Sanchez J, Kraaz P, Hutt OE, Haylock DN, Duggan PJ. The binding of boronated peptides to low affinity mammalian saccharides. Biopolymers 2018:e23101. [PMID: 29381187 DOI: 10.1002/bip.23101] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2017] [Revised: 12/18/2017] [Accepted: 12/20/2017] [Indexed: 11/09/2022]
Abstract
A 54-member library of boronated octapeptides, with all but the boronated residue being proteinogenic, was tested for affinity to a set of saccharides commonly found on the terminus of mammalian glycans. After experimentation with a high-throughput dye-displacement assay, attention was focused on isothermal titration calorimetry as a tool to provide reliable affinity data, including enthalpy and entropy of binding. A small number of boronated peptides showed higher affinity and significant selectivity for N-acetylneuraminic acid over methyl-α-d-galactopyranoside, methyl-α/β-l-fucopyranoside and N-acetyl-d-glucosamine. Thermodynamic data showed that for most of the boronated peptides studied, saccharide binding was associated with a significant increase in entropy, presumably resulting from the displacement of semiordered water molecules from around the sugar and/or peptide.
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Affiliation(s)
- Wioleta Kowalczyk
- CSIRO Manufacturing, Bag 10, Clayton South, Victoria, 3169, Australia
| | - Julie Sanchez
- CSIRO Manufacturing, Bag 10, Clayton South, Victoria, 3169, Australia
- Institut de Recherche de Chimie Paris, CNRS - Chimie ParisTech, 11 rue Pierre et Marie Curie, Paris, 75005, France
| | - Phillipe Kraaz
- CSIRO Manufacturing, Bag 10, Clayton South, Victoria, 3169, Australia
| | - Oliver E Hutt
- CSIRO Manufacturing, Bag 10, Clayton South, Victoria, 3169, Australia
| | - David N Haylock
- CSIRO Manufacturing, Bag 10, Clayton South, Victoria, 3169, 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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6
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Williams EGL, Hutt OE, Hinton TM, Larnaudie SC, Le T, MacDonald JM, Gunatillake P, Thang SH, Duggan PJ. Glycosylated Reversible Addition–Fragmentation Chain Transfer Polymers with Varying Polyethylene Glycol Linkers Produce Different Short Interfering RNA Uptake, Gene Silencing, and Toxicity Profiles. Biomacromolecules 2017; 18:4099-4112. [DOI: 10.1021/acs.biomac.7b01168] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
| | - Oliver E. Hutt
- CSIRO Manufacturing, Private Bag 10, Clayton South, Victoria 3169, Australia
| | - Tracey M. Hinton
- CSIRO Health and Biosecurity, Port Arlington Rd, East Geelong, Victoria 3219, Australia
| | - Sophie C. Larnaudie
- CSIRO Manufacturing, Private Bag 10, Clayton South, Victoria 3169, Australia
| | - Tam Le
- CSIRO Manufacturing, Private Bag 10, Clayton South, Victoria 3169, Australia
| | - James M. MacDonald
- CSIRO Manufacturing, Private Bag 10, Clayton South, Victoria 3169, Australia
| | | | - San H. Thang
- CSIRO Manufacturing, Private Bag 10, Clayton South, Victoria 3169, Australia
| | - Peter J. Duggan
- CSIRO Manufacturing, Private Bag 10, Clayton South, Victoria 3169, Australia
- School
of Chemical and Physical Sciences, Flinders University, Adelaide, South Australia 5042, Australia
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7
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Feast GC, Lepitre T, Tran N, Conn CE, Hutt OE, Mulet X, Drummond CJ, Savage GP. Inverse hexagonal and cubic micellar lyotropic liquid crystalline phase behaviour of novel double chain sugar-based amphiphiles. Colloids Surf B Biointerfaces 2017; 151:34-38. [DOI: 10.1016/j.colsurfb.2016.12.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Revised: 11/04/2016] [Accepted: 12/06/2016] [Indexed: 12/25/2022]
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8
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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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9
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Barlow KJ, Bernabeu V, Hao X, Hughes TC, Hutt OE, Polyzos A, Turner KA, Moad G. Triphenylphosphine-grafted, RAFT-synthesised, porous monoliths as catalysts for Michael addition in flow synthesis. REACT FUNCT POLYM 2015. [DOI: 10.1016/j.reactfunctpolym.2015.09.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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10
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Cao B, Hutt OE, Zhang Z, Li S, Heazlewood SY, Williams B, Smith JA, Haylock DN, Savage GP, Nilsson SK. Design, synthesis and binding properties of a fluorescent α₉β₁/α₄β₁ integrin antagonist and its application as an in vivo probe for bone marrow haemopoietic stem cells. Org Biomol Chem 2014; 12:965-78. [PMID: 24363056 DOI: 10.1039/c3ob42332h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [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
The α9β1 and α4β1 integrin subtypes are expressed on bone marrow haemopoietic stem cells and have important roles in stem cell regulation and trafficking. Although the roles of α4β1 integrin have been thoroughly investigated with respect to HSC function, the role of α9β1 integrin remains poorly characterised. Small molecule fluorescent probes are useful tools for monitoring biological processes in vivo, to determine cell-associated protein localisation and activation, and to elucidate the mechanism of small molecule mediated protein interactions. Herein, we report the design, synthesis and integrin-dependent cell binding properties of a new fluorescent α9β1 integrin antagonist (R-BC154), which was based on a series of N-phenylsulfonyl proline dipeptides and assembled using the Cu(I)-catalyzed azide alkyne cycloaddition (CuAAC) reaction. Using transfected human glioblastoma LN18 cells, we show that R-BC154 exhibits high nanomolar binding affinities to α9β1 integrin with potent cross-reactivity against α4β1 integrin under physiological mimicking conditions. On-rate and off-rate measurements revealed distinct differences in the binding kinetics between α9β1 and α4β1 integrins, which showed faster binding to α4β1 integrin relative to α9β1, but more prolonged binding to the latter. Finally, we show that R-BC154 was capable of binding rare populations of bone marrow haemopoietic stem and progenitor cells when administered to mice. Thus, R-BC154 represents a useful multi-purpose fluorescent integrin probe that can be used for (1) screening small molecule inhibitors of α9β1 and α4β1 integrins; (2) investigating the biochemical properties of α9β1 and α4β1 integrin binding and (3) investigating integrin expression and activation on defined cell phenotypes in vivo.
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Affiliation(s)
- Benjamin Cao
- CSIRO Materials Science and Engineering, Bag 10, Clayton Sth MDC, VIC 3169, Australia.
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11
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Bye N, Hutt OE, Hinton TM, Acharya DP, Waddington LJ, Moffat BA, Wright DK, Wang HX, Mulet X, Muir BW. Nitroxide-loaded hexosomes provide MRI contrast in vivo. Langmuir 2014; 30:8898-8906. [PMID: 24979524 DOI: 10.1021/la5007296] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The purpose of this work was to synthesize and screen, for their effectiveness to act as T1-enhancing magnetic resonance imaging (MRI) contrast agents, a small library of nitroxide lipids incorporated into cubic-phase lipid nanoparticles (cubosomes). The most effective nitroxide lipid was then formulated into lower-toxicity lipid nanoparticles (hexosomes), and effective MR contrast was observed in the aorta and spleen of live rats in vivo. This new class of lower-toxicity lipid nanoparticles allowed for higher relaxivities on the order of those of clinically used gadolinium complexes. The new hexosome formulation presented herein was significantly lower in toxicity and higher in relaxivity than cubosome formulations previously reported by us.
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Affiliation(s)
- Nicole Bye
- National Trauma Research Institute, Alfred Hospital and Department of Surgery, Monash University , Melbourne 3000, Australia
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12
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Feast GC, Lepitre T, Mulet X, Conn CE, Hutt OE, Savage GP, Drummond CJ. The search for new amphiphiles: synthesis of a modular, high-throughput library. Beilstein J Org Chem 2014; 10:1578-88. [PMID: 25161714 PMCID: PMC4142986 DOI: 10.3762/bjoc.10.163] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Accepted: 06/03/2014] [Indexed: 01/17/2023] Open
Abstract
Amphiphilic compounds are used in a variety of applications due to their lyotropic liquid-crystalline phase formation, however only a limited number of compounds, in a potentially limitless field, are currently in use. A library of organic amphiphilic compounds was synthesised consisting of glucose, galactose, lactose, xylose and mannose head groups and double and triple-chain hydrophobic tails. A modular, high-throughput approach was developed, whereby head and tail components were conjugated using the copper-catalysed azide-alkyne cycloaddition (CuAAC) reaction. The tails were synthesised from two core alkyne-tethered intermediates, which were subsequently functionalised with hydrocarbon chains varying in length and degree of unsaturation and branching, while the five sugar head groups were selected with ranging substitution patterns and anomeric linkages. A library of 80 amphiphiles was subsequently produced, using a 24-vial array, with the majority formed in very good to excellent yields. A preliminary assessment of the liquid-crystalline phase behaviour is also presented.
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Affiliation(s)
- George C Feast
- CSIRO Materials Science and Engineering, Bag 10, Clayton South MDC, VIC 3169, Australia
| | - Thomas Lepitre
- CSIRO Materials Science and Engineering, Bag 10, Clayton South MDC, VIC 3169, Australia
| | - Xavier Mulet
- CSIRO Materials Science and Engineering, Bag 10, Clayton South MDC, VIC 3169, Australia
| | - Charlotte E Conn
- CSIRO Materials Science and Engineering, Bag 10, Clayton South MDC, VIC 3169, Australia
| | - Oliver E Hutt
- CSIRO Materials Science and Engineering, Bag 10, Clayton South MDC, VIC 3169, Australia
| | - G Paul Savage
- CSIRO Materials Science and Engineering, Bag 10, Clayton South MDC, VIC 3169, Australia
| | - Calum J Drummond
- CSIRO Materials Science and Engineering, Bag 10, Clayton South MDC, VIC 3169, Australia ; School of Applied Sciences, College of Science, Engineering and Health, RMIT University, GPO Box 2476, Melbourne, VIC 3001, Australia
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13
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Feast GC, Hutt OE, Mulet X, Conn CE, Drummond CJ, Savage GP. Inside Cover: The High-Throughput Synthesis and Phase Characterisation of Amphiphiles: A Sweet Case Study (Chem. Eur. J. 10/2014). Chemistry 2014. [DOI: 10.1002/chem.201490038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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14
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Feast GC, Hutt OE, Mulet X, Conn CE, Drummond CJ, Savage GP. The High-Throughput Synthesis and Phase Characterisation of Amphiphiles: A Sweet Case Study. Chemistry 2014; 20:2783-92. [DOI: 10.1002/chem.201303514] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2013] [Indexed: 12/12/2022]
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15
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Barlow (née Tan) KJ, Hao X, Hughes TC, Hutt OE, Polyzos A, Turner KA, Moad G. Porous, functional, poly(styrene-co-divinylbenzene) monoliths by RAFT polymerization. Polym Chem 2014. [DOI: 10.1039/c3py01015e] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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16
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Ngatimin M, Frey R, Levens A, Nakano Y, Kowalczyk M, Konstas K, Hutt OE, Lupton DW. Iodobenzene-Catalyzed Oxabicyclo[3.2.1]octane and [4.2.1]Nonane Synthesis via Cascade C–O/C–C Formation. Org Lett 2013; 15:5858-61. [DOI: 10.1021/ol4029308] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Marsewi Ngatimin
- School of Chemistry, Monash University, Clayton 3800, Victoria, Australia, and CSIRO, Clayton South MDC 3169, Victoria, Australia
| | - Raphael Frey
- School of Chemistry, Monash University, Clayton 3800, Victoria, Australia, and CSIRO, Clayton South MDC 3169, Victoria, Australia
| | - Alison Levens
- School of Chemistry, Monash University, Clayton 3800, Victoria, Australia, and CSIRO, Clayton South MDC 3169, Victoria, Australia
| | - Yuji Nakano
- School of Chemistry, Monash University, Clayton 3800, Victoria, Australia, and CSIRO, Clayton South MDC 3169, Victoria, Australia
| | - Marcin Kowalczyk
- School of Chemistry, Monash University, Clayton 3800, Victoria, Australia, and CSIRO, Clayton South MDC 3169, Victoria, Australia
| | - Kristina Konstas
- School of Chemistry, Monash University, Clayton 3800, Victoria, Australia, and CSIRO, Clayton South MDC 3169, Victoria, Australia
| | - Oliver E. Hutt
- School of Chemistry, Monash University, Clayton 3800, Victoria, Australia, and CSIRO, Clayton South MDC 3169, Victoria, Australia
| | - David W. Lupton
- School of Chemistry, Monash University, Clayton 3800, Victoria, Australia, and CSIRO, Clayton South MDC 3169, Victoria, Australia
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Abstract
We have applied a diversity-oriented approach for the synthesis of skeletally diverse and stereochemically complex templates for small-molecule library production by performing Beckmann rearrangement and Beckmann fragmentation reactions on the bicyclo[3.2.1]octane rings of steviol and isosteviol, aglycones derived from the diterpene natural product stevioside. The optimization of these two reaction pathways is presented along with the successful application of a photo-Beckmann rearrangement. This work also led to the discovery of cyano-Prins-type and Thorpe-Ziegler-type cyclization reactions.
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Affiliation(s)
- Oliver E Hutt
- Institute for Therapeutics Discovery and Development, Department of Medicinal Chemistry, College of Pharmacy, University of Minnesota, 717 Delaware Street SE, Minneapolis, Minnesota 55414, United States
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18
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Son SJ, Brimble MA, Yang S, Harris PWR, Reddingius T, Muir BW, Hutt OE, Waddington L, Guan J, Savage GP. Synthesis and Self-Assembly of a Peptide - Amphiphile as a Drug Delivery Vehicle. Aust J Chem 2013. [DOI: 10.1071/ch12347] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The formation of functional liposomes by the self assembly of a peptide–amphiphile that comprises the neuroprotective tripeptide motif glycyl-prolyl-glutamic acid linked to a hydrophobic moiety is reported. The self-assembled peptide–lipid conjugate displays long range order and can be dispersed as nanometre sized particles.
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19
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Abstract
A small library of amphiphilic compounds was synthesized in an array using the Huisgen 1,3-dipolar cycloaddition of terminal alkynes with azides (CuAAC or click reaction). The self-assembling properties of these compounds were evaluated by polarizing microscopy and synchrotron small-angle X-ray scattering analysis.
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Affiliation(s)
- Oliver E. Hutt
- CSIRO Materials Science and Engineering, Private Bag 10, Clayton South MDC, Vic 3169, Australia
| | - Xavier Mulet
- CSIRO Materials Science and Engineering, Private Bag 10, Clayton South MDC, Vic 3169, Australia
| | - G. Paul Savage
- CSIRO Materials Science and Engineering, Private Bag 10, Clayton South MDC, Vic 3169, Australia
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20
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Abstract
A high yielding practical three-step procedure, which relies on an extractive work-up procedure, has been developed to convert N-phenylsulfonyl-trans-4-hydroxy-l-proline to N-phenylsulfonyl-cis-4-hydroxy-l-proline methyl ester in 82 % yield over three steps.
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Ngatimin M, Frey R, Andrews C, Lupton DW, Hutt OE. Iodobenzene catalysed synthesis of spirofurans and benzopyrans by oxidative cyclisation of vinylogous esters. Chem Commun (Camb) 2011; 47:11778-80. [DOI: 10.1039/c1cc15015d] [Citation(s) in RCA: 25] [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: 12/12/2022]
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22
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Hutt OE, Reddy BS, Nair SK, Reiff EA, Henri JT, Greiner JF, Chiu TL, VanderVelde DG, Amin EA, Himes RH, Georg GI. Total synthesis and evaluation of C25-benzyloxyepothilone C for tubulin assembly and cytotoxicity against MCF-7 breast cancer cells. Bioorg Med Chem Lett 2008; 18:4904-6. [PMID: 18684624 PMCID: PMC7047897 DOI: 10.1016/j.bmcl.2008.07.024] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2008] [Accepted: 07/01/2008] [Indexed: 10/21/2022]
Abstract
The total synthesis of C25-benzyloxy epothilone C is described. A sequential Suzuki-Aldol-Yamaguchi macrolactonization strategy was utilized employing a novel derivatized C8-C12 fragment. The C25-benzyloxy analog exhibited significantly reduced biological activity in microtubule assembly and cytotoxicity assays. Molecular modeling simulations indicated that excessive steric bulk in the C25 position may reduce activity by disrupting key hydrogen bonds that are crucial for epothilone binding to beta-tubulin.
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Affiliation(s)
- Oliver E. Hutt
- Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS 66045, USA
| | - Bollu S. Reddy
- Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS 66045, USA
| | - Sajiv K. Nair
- Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS 66045, USA
| | - Emily A. Reiff
- Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS 66045, USA
| | - John T. Henri
- Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS 66045, USA
| | - Jack F. Greiner
- Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS 66045, USA
| | - Ting-Lan Chiu
- Department of Medicinal Chemistry, and Institute for Therapeutics Discovery and Development, University of Minnesota, 717 Delaware Street SE, Minneapolis, MN 55414, USA
| | - David G. VanderVelde
- Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS 66045, USA
| | - Elizabeth A. Amin
- Department of Medicinal Chemistry, and Institute for Therapeutics Discovery and Development, University of Minnesota, 717 Delaware Street SE, Minneapolis, MN 55414, USA
| | - Richard H. Himes
- Department of Molecular Bioscience, University of Kansas, 1200 Sunnyside Avenue, Lawrence, KS 66045, USA
| | - Gunda I. Georg
- Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS 66045, USA
- Department of Medicinal Chemistry, and Institute for Therapeutics Discovery and Development, University of Minnesota, 717 Delaware Street SE, Minneapolis, MN 55414, USA
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Santhapuram HKR, Datta A, Hutt OE, Georg GI. N-Methylation of the C3′ Amide of Taxanes: Synthesis of N-Methyltaxol C and N-Methylpaclitaxel. J Org Chem 2008; 73:4705-8. [DOI: 10.1021/jo800173h] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Hari K. R. Santhapuram
- Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045-7582
| | - Apurba Datta
- Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045-7582
| | - Oliver E. Hutt
- Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045-7582
| | - Gunda I. Georg
- Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045-7582
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24
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Abstract
As a result of recent investigations into the total synthesis of the complex diterpene alkaloid nominine, the preparation of two new heterocyclic intermediates is now described. The cyclic ether 10 was derived from an intramolecular Mitsunobu reaction. The precursor hydroxylated compound 9 was the minor product of the hydroboration of alkene 7, which proceeded with an unexpected stereochemical outcome. The lactam 3 was derived from the hydrogenation of oxime 18 through presumed cyclization of the amino ester.
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25
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Affiliation(s)
- Oliver E. Hutt
- Research School of Chemistry, The Institute of Advanced Studies, The Australian National University, Canberra, ACT 0200, Australia
| | - Lewis N. Mander
- Research School of Chemistry, The Institute of Advanced Studies, The Australian National University, Canberra, ACT 0200, Australia
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26
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Abstract
Extracts of stems of growing shoots of Populus deltoides and P. trichocarpa, and developing capsules of P. deltoides were analysed for gibberellins (GAs) by gas chromatography-mass spectrometry. The following known GAs were identified by comparison of their Kovats retention indices (KRIs) and mass spectra with those of standards: GA1, GA8, GA9, GA19, GA20, 16 beta,17-dihydro-17-hydroxy GA20, GA23, GA28, GA29, GA34, GA44, and GA97. Several of these have not been previously reported from Populus. In addition, two new GAs were identified as 12 beta-hydroxy GA53 (GA127) and 16 beta,17-dihydro-17-hydroxy GA53 and their structures were confirmed by partial synthesis. Evidence was found of 16,17-dihydro-16,17-dihydroxy GA9, 16,17-dihydro-16,17-dihydroxy GA12, 12-hydroxy GA14, and GA34-catabolite by comparison of mass spectra and KRIs with published data. Several putative GAs (hydroxy- and dihydroxy-GA12-like) were also found. The catabolites of active GAs or of key precursors, hydroxylated at C-2 in stems and either C-2, C-12, C-17, or C-16,17 in capsules, were the major proportion of the GAs.
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Affiliation(s)
- David W Pearce
- Department of Biological Sciences, University of Lethbridge, Lethbridge, Alberta T1K 3M4, Canada.
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