1
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Perry MJ, Willis AC, Bremner JB, Keller PA. An investigation of the allylation cascade reactions of substituted indigos. RSC Adv 2023; 13:4865-4873. [PMID: 36760297 PMCID: PMC9901421 DOI: 10.1039/d3ra00481c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Accepted: 01/31/2023] [Indexed: 02/09/2023] Open
Abstract
In a continuation of the exploration of indigo cascade reactions, a series of -OMe, -Ph, -Br and -NO2 substituted indigos 1a-i were synthesised to probe electronic effects upon the outcome of allylation cascade reactions. When indigos 1a-i in the presence of base were reacted with allyl bromide, spiroindolinepyridoindolones 17-25 (36-75%) were obtained as the major products in each case, marking a shift in outcome relative to that previously reported for unsubstituted indigo. In electron-rich derivatives (-OMe, -Ph), C-allylspiroindolinepyridoindolediones 26-29 (3-11%) were also isolated, which are most likely formed via a Claisen rearrangement of the respective spiroindolinepyridoindolones 18-21. Additionally, the isolation of diallylbiindolone 16, oxazinobiindole 30 and N,N'-diallyl-3,3'-bis(allyloxy)biindole 31 each represented novel polyheterocyclic derivatives, providing intriguing new mechanistic insights, reaction pathways and in the case of 30 the first common heterocyclic skeletal outcome shared in both allylation and propargylation cascade reactions of indigo.
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Affiliation(s)
- Matthew J. Perry
- School of Chemistry and Molecular Bioscience, Molecular Horizons, and Illawarra Health and Medical Research Institute, University of WollongongWollongongNSW2522Australia
| | - Anthony C. Willis
- Research School of Chemistry, Australian National UniversityCanberraACT2601Australia
| | - John B. Bremner
- School of Chemistry and Molecular Bioscience, Molecular Horizons, and Illawarra Health and Medical Research Institute, University of WollongongWollongongNSW2522Australia
| | - Paul A. Keller
- School of Chemistry and Molecular Bioscience, Molecular Horizons, and Illawarra Health and Medical Research Institute, University of WollongongWollongongNSW2522Australia
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2
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Banwell MG, Schwartz BD, Bissember AC, Herlt T, Willis AC, Gardiner MG, Illesinghe J, Robinson AJ. Syntheses of the (±)‐, (+)‐, and (−)‐Forms of 2‐Amino‐3‐(8‐hydroxyquinolin‐3‐yl)propanoic Acid (8HQ‐3Ala) from a Common Dehydroamino Acid Methyl Ester Precursor. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202100455] [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: 11/11/2022]
Affiliation(s)
- Martin G. Banwell
- Institute for Advanced and Applied Chemical Synthesis Jinan University, Guangzhou Guangdong 510632 China
| | - Brett D. Schwartz
- Research School of Chemistry Institute of Advanced Studies The Australian National University Canberra ACT 2601 Australia
| | - Alex C. Bissember
- Research School of Chemistry Institute of Advanced Studies The Australian National University Canberra ACT 2601 Australia
| | - Tony Herlt
- Research School of Chemistry Institute of Advanced Studies The Australian National University Canberra ACT 2601 Australia
| | - Anthony C. Willis
- Research School of Chemistry Institute of Advanced Studies The Australian National University Canberra ACT 2601 Australia
| | - Michael G. Gardiner
- Research School of Chemistry Institute of Advanced Studies The Australian National University Canberra ACT 2601 Australia
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3
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Fares M, Canfield P, Alsherbiny MA, Lewis W, Willis AC, Guang Li C, Neyts J, Jochmans D, Gale PA, Keller PA. Synthesis, X-ray crystallographic analysis, DFT studies and biological evaluation of triazolopyrimidines and 2-anilinopyrimidines. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2021.132092] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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4
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Vafazadeh R, Aghayani S, Willis AC. Synthesis, structure characterization and Hirshfeld surface analysis of Ni(II) complexes with a flexidentate ligand: a dinuclear complex with O−H−O bond. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.131192] [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: 10/20/2022]
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5
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Gaston JJ, Tague AJ, Smyth JE, Butler NM, Willis AC, van Eikema Hommes N, Yu H, Clark T, Keller PA. The Detosylation of Chiral 1,2-Bis(tosylamides). J Org Chem 2021; 86:9163-9180. [PMID: 34153182 DOI: 10.1021/acs.joc.1c00359] [Citation(s) in RCA: 3] [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: 12/26/2022]
Abstract
The deprotection of chiral 1,2-bis(tosylamides) to their corresponding 1,2-diamines is mostly unsuccessful under standard conditions. In a new methodology, the use of Mg/MeOH with sufficient steric additions allows the facile synthesis of 1,2-diamines in 78-98% yields. These results are rationalized using density functional theory and the examination of inner and outer-sphere reduction mechanisms.
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Affiliation(s)
- Jayden J Gaston
- School of Chemistry and Molecular Bioscience, Molecular Horizons, University of Wollongong and Illawarra Health and Medical Research Institute, Wollongong, NSW 2522, Australia
| | - Andrew J Tague
- School of Chemistry and Molecular Bioscience, Molecular Horizons, University of Wollongong and Illawarra Health and Medical Research Institute, Wollongong, NSW 2522, Australia
| | - Jamie E Smyth
- School of Chemistry and Molecular Bioscience, Molecular Horizons, University of Wollongong and Illawarra Health and Medical Research Institute, Wollongong, NSW 2522, Australia
| | - Nicholas M Butler
- School of Chemistry and Molecular Bioscience, Molecular Horizons, University of Wollongong and Illawarra Health and Medical Research Institute, Wollongong, NSW 2522, Australia
| | - Anthony C Willis
- School of Chemistry, The Australian National University, Canberra, ACT 2601, Australia
| | - Nico van Eikema Hommes
- Computer Chemistry Center, Department of Chemistry and Pharmacy, Friedrich-Alexander Universität Erlangen-Nürnberg, Nägelsbachstraße 25, 91052 Erlangen, Germany
| | - Haibo Yu
- School of Chemistry and Molecular Bioscience, Molecular Horizons, University of Wollongong and Illawarra Health and Medical Research Institute, Wollongong, NSW 2522, Australia
| | - Timothy Clark
- Computer Chemistry Center, Department of Chemistry and Pharmacy, Friedrich-Alexander Universität Erlangen-Nürnberg, Nägelsbachstraße 25, 91052 Erlangen, Germany
| | - Paul A Keller
- School of Chemistry and Molecular Bioscience, Molecular Horizons, University of Wollongong and Illawarra Health and Medical Research Institute, Wollongong, NSW 2522, Australia
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6
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McCosker PM, Butler NM, Shakoori A, Volland MK, Perry MJ, Mullen JW, Willis AC, Clark T, Bremner JB, Guldi DM, Keller PA. Cover Feature: The Cascade Reactions of Indigo with Propargyl Substrates for Heterocyclic and Photophysical Diversity (Chem. Eur. J. 11/2021). Chemistry 2021. [DOI: 10.1002/chem.202004188] [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: 11/11/2022]
Affiliation(s)
- Patrick M. McCosker
- School of Chemistry & Molecular Bioscience Molecular Horizons Illawarra Health & Medical Research Institute University of Wollongong Northfields Avenue 2522 Wollongong NSW Australia
- Department of Chemistry and Pharmacy Computer-Chemistry-Center (CCC) Friedrich-Alexander-Universität Erlangen–Nürnberg (FAU) Nägelbachstrasse 25 91052 Erlangen Germany
- Department of Chemistry and Pharmacy Interdisciplinary Center for Molecular Materials (ICMM) Chair of Physical Chemistry I Friedrich-Alexander-Universität Erlangen–Nürnberg (FAU) Egerlandstrasse 3 91058 Erlangen Germany
| | - Nicholas M. Butler
- School of Chemistry & Molecular Bioscience Molecular Horizons Illawarra Health & Medical Research Institute University of Wollongong Northfields Avenue 2522 Wollongong NSW Australia
| | - Alireza Shakoori
- School of Chemistry & Molecular Bioscience Molecular Horizons Illawarra Health & Medical Research Institute University of Wollongong Northfields Avenue 2522 Wollongong NSW Australia
| | - Michel K. Volland
- Department of Chemistry and Pharmacy Interdisciplinary Center for Molecular Materials (ICMM) Chair of Physical Chemistry I Friedrich-Alexander-Universität Erlangen–Nürnberg (FAU) Egerlandstrasse 3 91058 Erlangen Germany
| | - Matthew J. Perry
- School of Chemistry & Molecular Bioscience Molecular Horizons Illawarra Health & Medical Research Institute University of Wollongong Northfields Avenue 2522 Wollongong NSW Australia
| | - Jesse W. Mullen
- School of Chemistry & Molecular Bioscience Molecular Horizons Illawarra Health & Medical Research Institute University of Wollongong Northfields Avenue 2522 Wollongong NSW Australia
| | - Anthony C. Willis
- Research School of Chemistry The Australian National University Canberra, Australian Capital Territory 2601 Australia
| | - Timothy Clark
- Department of Chemistry and Pharmacy Computer-Chemistry-Center (CCC) Friedrich-Alexander-Universität Erlangen–Nürnberg (FAU) Nägelbachstrasse 25 91052 Erlangen Germany
| | - John B. Bremner
- School of Chemistry & Molecular Bioscience Molecular Horizons Illawarra Health & Medical Research Institute University of Wollongong Northfields Avenue 2522 Wollongong NSW Australia
| | - Dirk M. Guldi
- Department of Chemistry and Pharmacy Interdisciplinary Center for Molecular Materials (ICMM) Chair of Physical Chemistry I Friedrich-Alexander-Universität Erlangen–Nürnberg (FAU) Egerlandstrasse 3 91058 Erlangen Germany
| | - Paul A. Keller
- School of Chemistry & Molecular Bioscience Molecular Horizons Illawarra Health & Medical Research Institute University of Wollongong Northfields Avenue 2522 Wollongong NSW Australia
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7
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McCosker PM, Butler NM, Shakoori A, Volland MK, Perry MJ, Mullen JW, Willis AC, Clark T, Bremner JB, Guldi DM, Keller PA. The Cascade Reactions of Indigo with Propargyl Substrates for Heterocyclic and Photophysical Diversity. Chemistry 2021; 27:3708-3721. [PMID: 32885487 DOI: 10.1002/chem.202003662] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [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: 08/06/2020] [Revised: 08/31/2020] [Indexed: 11/11/2022]
Abstract
The synthesis of structurally diverse heterocycles for chemical space exploration was achieved via the cascade reactions of indigo with propargylic electrophiles. New pyrazinodiindolodione, naphthyridinedione, azepinodiindolone, oxazinoindolone and pyrrolodione products were prepared in one pot reactions by varying the leaving group (-Cl, -Br, -OMs, -OTs) or propargyl terminal functionality (-H, -Me, -Ph, -Ar). Mechanistic and density functional theory studies revealed that the unsaturated propargyl moiety can behave as an electrophile when aromatic terminal substitutions are made, and therefore competes with leaving group substitution for new outcomes. Selected products from the cascade reactions were investigated for their absorption and fluorescence properties, including transient absorption spectroscopy. This revealed polarity dependent excited state relaxation pathways, fluorescence, and triplet formation, thus highlighting these reactions as a means to access diverse functional materials rapidly.
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Affiliation(s)
- Patrick M McCosker
- School of Chemistry & Molecular Bioscience, Molecular Horizons, Illawarra Health & Medical Research Institute, University of Wollongong, Northfields Avenue, 2522, Wollongong, NSW, Australia.,Department of Chemistry and Pharmacy, Computer-Chemistry-Center (CCC), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Nägelbachstrasse 25, 91052, Erlangen, Germany.,Department of Chemistry and Pharmacy, Interdisciplinary Center for Molecular Materials (ICMM), Chair of Physical Chemistry I, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstrasse 3, 91058, Erlangen, Germany
| | - Nicholas M Butler
- School of Chemistry & Molecular Bioscience, Molecular Horizons, Illawarra Health & Medical Research Institute, University of Wollongong, Northfields Avenue, 2522, Wollongong, NSW, Australia
| | - Alireza Shakoori
- School of Chemistry & Molecular Bioscience, Molecular Horizons, Illawarra Health & Medical Research Institute, University of Wollongong, Northfields Avenue, 2522, Wollongong, NSW, Australia
| | - Michel K Volland
- Department of Chemistry and Pharmacy, Interdisciplinary Center for Molecular Materials (ICMM), Chair of Physical Chemistry I, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstrasse 3, 91058, Erlangen, Germany
| | - Matthew J Perry
- School of Chemistry & Molecular Bioscience, Molecular Horizons, Illawarra Health & Medical Research Institute, University of Wollongong, Northfields Avenue, 2522, Wollongong, NSW, Australia
| | - Jesse W Mullen
- School of Chemistry & Molecular Bioscience, Molecular Horizons, Illawarra Health & Medical Research Institute, University of Wollongong, Northfields Avenue, 2522, Wollongong, NSW, Australia
| | - Anthony C Willis
- Research School of Chemistry, The Australian National University, Canberra, Australian Capital Territory, 2601, Australia
| | - Timothy Clark
- Department of Chemistry and Pharmacy, Computer-Chemistry-Center (CCC), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Nägelbachstrasse 25, 91052, Erlangen, Germany
| | - John B Bremner
- School of Chemistry & Molecular Bioscience, Molecular Horizons, Illawarra Health & Medical Research Institute, University of Wollongong, Northfields Avenue, 2522, Wollongong, NSW, Australia
| | - Dirk M Guldi
- Department of Chemistry and Pharmacy, Interdisciplinary Center for Molecular Materials (ICMM), Chair of Physical Chemistry I, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstrasse 3, 91058, Erlangen, Germany
| | - Paul A Keller
- School of Chemistry & Molecular Bioscience, Molecular Horizons, Illawarra Health & Medical Research Institute, University of Wollongong, Northfields Avenue, 2522, Wollongong, NSW, Australia
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8
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Cervi A, Vo Y, Chai CLL, Banwell MG, Lan P, Willis AC. Gold(I)-Catalyzed Intramolecular Hydroarylation of Phenol-Derived Propiolates and Certain Related Ethers as a Route to Selectively Functionalized Coumarins and 2 H-Chromenes. J Org Chem 2021; 86:178-198. [PMID: 33253562 DOI: 10.1021/acs.joc.0c02011] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Methods are reported for the efficient assembly of a series of phenol-derived propiolates, including the parent system 56, and their Au(I)-catalyzed cyclization (intramolecular hydroarylation) to give the corresponding coumarins (e.g., 1). Simple syntheses of natural products such as ayapin (144) and scoparone (145) have been realized by such means, and the first of these subject to single-crystal X-ray analysis. A related process is described for the conversion of propargyl ethers such as 156 into the isomeric 2H-chromene precocene I (159), a naturally occurring inhibitor of juvenile hormone biosynthesis.
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Affiliation(s)
- Aymeric Cervi
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, Australian Capital Territory 2601, Australia.,Institute of Chemical and Engineering Sciences, 8 Biomedical Grove, #07-01 Neuros, 138665, Singapore
| | - Yen Vo
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Christina L L Chai
- Institute of Chemical and Engineering Sciences, 8 Biomedical Grove, #07-01 Neuros, 138665, Singapore.,Department of Pharmacy, National University of Singapore, 18 Science Drive 4, 117543, Singapore
| | - Martin G Banwell
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, Australian Capital Territory 2601, Australia.,Institute for Advanced and Applied Chemical Synthesis, Jinan University, Guangzhou, Guangdong 510632, China
| | - Ping Lan
- Institute for Advanced and Applied Chemical Synthesis, Jinan University, Guangzhou, Guangdong 510632, China
| | - Anthony C Willis
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
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9
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Thaima T, Yazici A, Auranwiwat C, Willis AC, Wille U, Limtharakul T, Pyne SG. Synthesis of spirocyclic heterocycles from α,β-unsaturated N-acyliminium ions. Org Biomol Chem 2021; 19:259-272. [DOI: 10.1039/d0ob02075c] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [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 reactions of α,β-unsaturated N-acyliminium ions, generated in situ from 4(S)-O-substitutedhydroxy-5-hydroxy-5-vinyl-N-alkylpyrrolidin-2-ones, with allylsilanes and indoles leading to the formation of spirocyclic heterocycles, are reported.
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Affiliation(s)
- Thanphat Thaima
- School of Chemistry and Molecular Bioscience
- University of Wollongong
- Wollongong
- Australia
| | - Arife Yazici
- School of Chemistry and Molecular Bioscience
- University of Wollongong
- Wollongong
- Australia
| | - Chiramet Auranwiwat
- School of Chemistry and Molecular Bioscience
- University of Wollongong
- Wollongong
- Australia
- Department of Chemistry
| | - Anthony C. Willis
- Research School of Chemistry
- Australian National University
- Canberra
- Australia
| | - Uta Wille
- School of Chemistry
- Bio21 Institute
- University of Melbourne
- Parkville
- Australia
| | - Thunwadee Limtharakul
- Department of Chemistry
- Faculty of Science
- and the Research Center on Chemistry for Development of Health Promoting Products from Northern Resources
- Chiang Mai University
- Chiang Mai 50200
| | - Stephen. G. Pyne
- School of Chemistry and Molecular Bioscience
- University of Wollongong
- Wollongong
- Australia
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10
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Banwell MG, Crisp AL, Lee B, Lan P, Bollard HE, Ward JS, Willis AC. The Synthesis, Structural Characterisation, and Chemoselective Manipulation of Certain Functionalised Cyclic Sulfates Derived from Chiral, Non-Racemic, and Polysubstituted Bicyclo[2.2.2]octane-2,3-diols. Aust J Chem 2021. [DOI: 10.1071/ch21140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Certain cyclic sulfates (e.g. 23) together with various of their precursor sulfites (e.g. 21 and 22) have been prepared from the corresponding chiral, non-racemic bicyclo[2.2.2]octane-2,3-diols (e.g. 20). Such diols are obtained by engaging the corresponding enzymatically derived and enantiomerically enriched or homochiral cis-1,2-dihydrocatechol (e.g. 10) or certain derivatives in either inter- or intra-molecular Diels–Alder cycloaddition reactions. Other functionalities present within the title compounds can be chemoselectively manipulated without adversely affecting the associated sulfate residues.
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11
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Dawurung CJ, Noitem R, Rattanajak R, Bunyong R, Richardson C, Willis AC, Kamchonwongpaisan S, Yimnual C, Muanprasat C, Pyne SG. Isolation of CFTR and TMEM16A inhibitors from Neorautanenia mitis (A. Rich) Verdcourt: Potential lead compounds for treatment of secretory diarrhea. Phytochemistry 2020; 179:112464. [PMID: 32798746 DOI: 10.1016/j.phytochem.2020.112464] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Revised: 07/14/2020] [Accepted: 07/19/2020] [Indexed: 06/11/2023]
Abstract
A phytochemical study on the root extracts of Neorautanenia mitis, a Nigerian medicinal plant used in the management of diarrhea, led to the isolation of one new and 19 known natural products. These compounds and crude extracts were evaluated for Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) Cl- channel and calcium-activated Cl- channel (TMEM16A) inhibitory activities in T84 and Calu-3 cells, respectively. Four compounds namely dolineon, neodulin, pachyrrhizine, and neotenone inhibited cAMP-induced Cl- secretion across T84 cell monolayers with IC50 values of ~0.81 μM, ~2.42 μM, ~2.87 μM, and ~4.66 μM, respectively. Dolineon having the highest inhibitory activity also inhibited a Ca + activated Cl- channel (TMEM16A) with an IC50 value of ~4.38 μM. The in vitro antidiarrheal activity of dolineon was evaluated on cholera toxin (CT) induced chloride secretion in T84 cells, where it inhibited CT-induced chloride secretion by >70% at 100 μM. Dolineon also inhibited CT-induced fluid secretion by ~70% in an in vivo mouse closed loop model at a dose of 16.9 μg/loop. The cytotoxicity of the extracts and compounds was evaluated on KB, Vero and BHK21 cells, dolineon showed low cytotoxicity of >29.6 μM and 57.30 + 6.77 μM against Vero and BHK21 cells, respectively. Our study revealed that several compounds isolated from N. mitis showed antidiarrheal activity. The most active compound dolineon can potentially serve as a lead compound towards the development of CFTR and TMEM16A inhibitors as future therapeutics for secretory diarrhea.
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Affiliation(s)
- Christiana J Dawurung
- School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, NSW, 2522, Australia; Department of Veterinary Physiology, Biochemistry and Pharmacology, University of Jos, Jos Plateau State, Nigeria.
| | - Rattikarn Noitem
- Division of Preclinical Sciences, Chakri Naruebodindra Medical Institute, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Samutprakarn, 10540, Thailand.
| | - Roonglawan Rattanajak
- National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Pathum Thani, 12120, Thailand.
| | - Ratchanu Bunyong
- National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Pathum Thani, 12120, Thailand.
| | - Christopher Richardson
- School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, NSW, 2522, Australia.
| | - Anthony C Willis
- Research School of Chemistry, The Australian National University, Canberra, ACT, 2601, Australia.
| | - Sumalee Kamchonwongpaisan
- National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Pathum Thani, 12120, Thailand.
| | - Chantapol Yimnual
- Division of Preclinical Sciences, Chakri Naruebodindra Medical Institute, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Samutprakarn, 10540, Thailand.
| | - Chatchai Muanprasat
- Division of Preclinical Sciences, Chakri Naruebodindra Medical Institute, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Samutprakarn, 10540, Thailand.
| | - Stephen G Pyne
- School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, NSW, 2522, Australia.
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12
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Lee B, Willis AC, Ward JS, Smith WT, Lan P, Banwell MG. Iterative Suzuki-Miyaura Cross-coupling/Bromo-desilylation Reaction Sequences for the Assembly of Chemically Well-defined, Acyclic Oligopyrrole/Benzenoid Hybrids Embodying Mixed Modes of Connectivity. Chem Asian J 2020; 15:3059-3081. [PMID: 32749069 DOI: 10.1002/asia.202000740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 06/26/2020] [Revised: 07/30/2020] [Indexed: 11/12/2022]
Abstract
Syntheses of a range of chemically well-defined oligopyrrole/benzenoid hybrids are described using tandem Suzuki-Miyaura cross-coupling/bromo-desilyation reaction sequences for linking borylated pyrroles, halogenated pyrroles and/or dibromobenzenes to one another. By such means, including iterative variants, a range of all α-linked, all β-linked oligopyrroles as well as certain combinations thereof have been assembled, some of them for the first time. The conductivities of iodine-treated thin films formed from certain such systems have been determined.
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Affiliation(s)
- BoRa Lee
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, ACT 2601, Australia
| | - Anthony C Willis
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, ACT 2601, Australia
| | - Jas S Ward
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, ACT 2601, Australia
| | | | - Ping Lan
- Institute for Advanced and Applied Chemical Synthesis, Jinan University, Guangzhou, 510632/, Zhuhai, 519070, Guangdong, China
| | - Martin G Banwell
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, ACT 2601, Australia.,Institute for Advanced and Applied Chemical Synthesis, Jinan University, Guangzhou, 510632/, Zhuhai, 519070, Guangdong, China
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13
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Stewart SG, Harfoot GJ, McRae KJ, Teng Y, Yu LJ, Chen B, Cammi R, Coote ML, Banwell MG, Willis AC. High-Pressure-Promoted and Facially Selective Diels–Alder Reactions of Enzymatically Derived cis-1,2-Dihydrocatechols and Their Acetonide Derivatives: Enantiodivergent Routes to Homochiral and Polyfunctionalized Bicyclo[2.2.2]octenes. J Org Chem 2020; 85:13080-13095. [DOI: 10.1021/acs.joc.0c01767] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Scott G. Stewart
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, ACT 2601 Australia
| | - Gwion J. Harfoot
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, ACT 2601 Australia
| | - Kenneth J. McRae
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, ACT 2601 Australia
| | - Yinglai Teng
- Institute for Advanced and Applied Chemical Synthesis, Jinan University, Guangzhou 510632, China
| | - Li-Juan Yu
- Research School of Chemistry, Institute of Advanced Studies and ARC Centre of Excellence for Electromaterials Science, Research School of Chemistry, The Australian National University, Canberra, ACT 2601 Australia
| | - Bo Chen
- Donostia International Physics Center, Paseo Manuel de Lardizabal, 4, 20018 Donostia-San Sebastian, Spain
- IKERBASQUE, Basque Foundation for Science, Maria Diaz de Haro 3, 48013 Bilbao, Spain
| | - Roberto Cammi
- Department of Chemical Science, Life Science and Environmental Sustainability, University of Parma, I-43100 Parma, Italy
| | - Michelle L. Coote
- Research School of Chemistry, Institute of Advanced Studies and ARC Centre of Excellence for Electromaterials Science, Research School of Chemistry, The Australian National University, Canberra, ACT 2601 Australia
| | - Martin G. Banwell
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, ACT 2601 Australia
- Institute for Advanced and Applied Chemical Synthesis, Jinan University, Guangzhou 510632, China
| | - Anthony C. Willis
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, ACT 2601 Australia
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14
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Pham SQT, Richardson C, Kelso C, Willis AC, Ralph SF. The effect of isomerism and other structural variations on the G-quadruplex DNA-binding properties of some nickel Schiff base complexes. Dalton Trans 2020; 49:10360-10379. [PMID: 32666965 DOI: 10.1039/d0dt01370f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
A series of novel isomeric nickel Schiff base complexes, as well as nickel complexes of related ligands having asymmetric structures have been prepared and characterised using microanalysis, 1H and 13C NMR spectroscopy and ESI-MS. The Schiff base ligands were prepared by condensation reactions involving ethylenediamine and different derivatives of benzophenone. The solid-state structures of eight of the complexes were also determined and revealed that each possessed a regular square planar coordination geometry around the metal ion. Many of the new complexes featured at least one, and in many instances two, protonatable pendant groups that enhance aqueous solubility. This enabled the DNA binding properties of the latter complexes to be explored using a variety of instrumental approaches, including ESI-MS, circular dichroism (CD) spectroscopy, FRET melting assays and FID assays, as well as molecular docking studies. The results of experiments performed using ESI-MS suggested that none of the nickel complexes exhibit a high affinity towards either a double stranded DNA (dsDNA) molecule D2, or the parallel unimolecular quadruplex DNA (qDNA) molecule Q1. In contrast, complexes (8) and (12) both gave spectra which reflected a significant level of binding to the parallel tetramolecular qDNA Q4. The results of binding experiments performed using CD spectroscopy suggested that (12) exhibits a significant level of affinity towards most types of DNA, while (4) shows a preference for interacting with parallel, unimolecular qDNA molecules. Complex (4) produced the lowest values of DC50 in FID assays performed using parallel Q1 or Q4, confirming its affinity for these qDNA molecules. The results of FRET melting experiments provided further evidence that (12), along with (8), can interact extensively with anti-parallel unimolecular qDNA. Experiments which monitored the effect of the nickel complexes on the melting temperature of D2 showed that none had a stabilising effect on this dsDNA molecule.
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Affiliation(s)
- Son Q T Pham
- School of Chemistry and Molecular Bioscience, University of Wollongong, Northfields Avenue, Wollongong 2522, Australia. and Molecular Horizons, University of Wollongong, Northfields Avenue, Wollongong 2522, Australia
| | - Christopher Richardson
- School of Chemistry and Molecular Bioscience, University of Wollongong, Northfields Avenue, Wollongong 2522, Australia. and Molecular Horizons, University of Wollongong, Northfields Avenue, Wollongong 2522, Australia
| | - Celine Kelso
- School of Chemistry and Molecular Bioscience, University of Wollongong, Northfields Avenue, Wollongong 2522, Australia. and Molecular Horizons, University of Wollongong, Northfields Avenue, Wollongong 2522, Australia
| | - Anthony C Willis
- Research School of Chemistry, Australian National University, Canberra, Australian Capital Territory 0200, Australia
| | - Stephen F Ralph
- School of Chemistry and Molecular Bioscience, University of Wollongong, Northfields Avenue, Wollongong 2522, Australia. and Molecular Horizons, University of Wollongong, Northfields Avenue, Wollongong 2522, Australia
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15
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Frogley BJ, Hill AF, Shang R, Sharma M, Willis AC. In Search of Fulminate Analogues: L
n
M≡CP=NR. Chemistry 2020; 26:8819-8827. [DOI: 10.1002/chem.202000635] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Revised: 05/01/2020] [Indexed: 11/05/2022]
Affiliation(s)
- Benjamin J. Frogley
- Research School of Chemistry The Australian National University Canberra ACT 2601 Australia
| | - Anthony F. Hill
- Research School of Chemistry The Australian National University Canberra ACT 2601 Australia
| | - Rong Shang
- Department of Chemistry Graduate School of Science Hiroshima University Hiroshima Japan
| | - Manab Sharma
- Research School of Chemistry The Australian National University Canberra ACT 2601 Australia
| | - Anthony C. Willis
- Research School of Chemistry The Australian National University Canberra ACT 2601 Australia
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16
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Vafazadeh R, Mansouri Z, Willis AC. Nickel(II) Complex with a Flexidentate Ligand Derived from Acetohydrazide: Synthesis, Structural Characterization and Hirshfeld Surface Analysis. Acta Chim Slov 2020. [DOI: 10.17344/acsi.2019.5539] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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17
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Vafazadeh R, Mansouri Z, Willis AC. Nickel(II) Complex with a Flexidentate Ligand Derived from Acetohydrazide: Synthesis, Structural Characterization and Hirshfeld Surface Analysis. Acta Chim Slov 2020; 67:516-521. [PMID: 33855577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023] Open
Abstract
The mononuclear Ni(II) complex [Ni(Lp)2(CH3OH)2]Cl2 has been synthesized by reacting 1-(5-hydroxy-3-methyl-5-phenyl-4,5-dihydro-1H-pyrazol-1-yl)ethan-1-one ligand (HL) with NiCl2·6H2O in methanol solution. In the reaction, the tridentate ligand, HL, was converted in situ into 4-hydroxy-4-phenylbut-3-en-2-ylidene)acetohydrazid ligand, (pyrazole, Lp). The pyrazole ligand acts as bidentate neutral ligand and the hydroxyl group is left uncoordinated. The structure of the Ni(II) complex has been established by X-ray crystallography. The Ni(II) is six-coordinate and has a distorted octahedral geometry. It is bonded by two nitrogen and by two oxygen atoms of the two pyrazole ligands and two oxygen atoms of methanol molecules. The Hirshfeld surface analysis and the 2D the fingerprint plot are used to analyses all of the intermolecular contacts in the crystal structures. The main intermolecular contacts are H/H and Cl/H interactions.
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18
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Carroll AW, Willis AC, Hoshino M, Kato A, Pyne SG. Correction to Corrected Structure of Natural Hyacinthacine C 1 via Total Synthesis. J Nat Prod 2020; 83:1733. [PMID: 32315182 DOI: 10.1021/acs.jnatprod.0c00389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
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19
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Carroll AW, Savaspun K, Willis AC, Hoshino M, Kato A, Pyne SG. Correction to “Total Synthesis of Natural Hyacinthacine C5 and Six Related Hyacinthacine C5 Epimers”. J Org Chem 2020; 85:6242. [DOI: 10.1021/acs.joc.0c00855] [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: 11/30/2022]
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20
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Meesakul P, Jaidee W, Richardson C, Andersen RJ, Patrick BO, Willis AC, Muanprasat C, Wang J, Lei X, Hadsadee S, Jungsuttiwong S, Pyne SG, Laphookhieo S. Styryllactones from Goniothalamus tamirensis. Phytochemistry 2020; 171:112248. [PMID: 31918304 DOI: 10.1016/j.phytochem.2019.112248] [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] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2019] [Revised: 12/21/2019] [Accepted: 12/22/2019] [Indexed: 06/10/2023]
Abstract
The phytochemical investigation of the twig and leaf extracts of Goniothalamus tamirensis led to the isolation and identification of 15 compounds including three rare previously undescribed styryllactones, goniotamirenones A-C, together with 12 known compounds. (Z)-6-Styryl-5,6-dihydro-2-pyranone and 5-(1-hydroxy-3-phenyl-allyl)-dihydro-furan-2-one are reported here for the first time as previously undescribed natural products. Their structures were elucidated by spectroscopic methods. Goniotamirenone A was synthesized via a [2 + 2] cycloaddition reaction of 6-styrrylpyran-2-one in quantitative yield. The absolute configurations of goniotamirenones B and C were identified from experimental and calculated ECD data, while the absolute configurations of (-)-5-acetoxygoniothalamin, (-)-isoaltholactone, parvistone E, and 5-(1-hydroxy-3-phenyl-allyl)-dihydro-furan-2-one were identified by single-crystal X-ray diffraction analysis using Cu Kα radiation. The absolute configurations of the other related compounds were determined from comparisons of their ECD spectra with relevant compounds reported in the literature. (-)-5-Acetoxygoniothalamin exhibited potent cytotoxicity against the colon cancer cell line (HCT116) with an IC50 value of 8.6 μM which was better than the standard control (doxorubicin, IC50 = 9.7 μM), while (Z)-6-styryl-5,6-dihydro-2-pyranone was less active with an IC50 value of 22.1 μM.
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Affiliation(s)
- Pornphimol Meesakul
- Center of Chemical Innovation for Sustainability (CIS), Mae Fah Luang University, Chiang Rai, 57100, Thailand; School of Science, Mae Fah Luang University, Chiang Rai, 57100, Thailand; School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, New South Wales, 2522, Australia
| | - Wuttichai Jaidee
- Center of Chemical Innovation for Sustainability (CIS), Mae Fah Luang University, Chiang Rai, 57100, Thailand; School of Science, Mae Fah Luang University, Chiang Rai, 57100, Thailand
| | - Christopher Richardson
- School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, New South Wales, 2522, Australia
| | - Raymond J Andersen
- Departments of Chemistry and Earth, Ocean & Atmospheric Sciences, University of British Columbia, 2036 Main Mall, Vancouver, BC, V6T 1Z1, Canada
| | - Brian O Patrick
- Departments of Chemistry and Earth, Ocean & Atmospheric Sciences, University of British Columbia, 2036 Main Mall, Vancouver, BC, V6T 1Z1, Canada
| | - Anthony C Willis
- Research School of Chemistry, The Australian National University, Canberra, ACT, 2601, Australia
| | - Chatchai Muanprasat
- Division of Preclinical Sciences, Chakri Naruebodindra Medical Institute, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangpli, Samutprakarn, 10540, Thailand; Excellent Center of Drug Discovery, Faculty of Science, Mahidol University, Rajathevi, Bangkok, 10400, Thailand
| | - Jin Wang
- College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
| | - Xiaoguang Lei
- College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China; Peking-Tsinghua Center for Life Science, Peking University, Beijing, 100871, China
| | - Sarinya Hadsadee
- Center for Organic Electronic and Alternative Energy, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani, 34190, Thailand
| | - Siriporn Jungsuttiwong
- Center for Organic Electronic and Alternative Energy, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani, 34190, Thailand
| | - Stephen G Pyne
- School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, New South Wales, 2522, Australia.
| | - Surat Laphookhieo
- Center of Chemical Innovation for Sustainability (CIS), Mae Fah Luang University, Chiang Rai, 57100, Thailand; School of Science, Mae Fah Luang University, Chiang Rai, 57100, Thailand.
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21
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Blüchel CG, Mikusek J, Willis AC, Gardiner MG, Banwell MG. Syntheses of Dimethyl (1 S,2 R)-3-Bromocyclohexa-3,5-diene-1,2-dicarboxylate and Its Enantiomer. J Org Chem 2020; 85:2303-2311. [PMID: 31873013 DOI: 10.1021/acs.joc.9b03014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The title compounds, (-)-2 and (+)-2, representing potentially valuable building blocks for chemical synthesis, have each been prepared from cyclopentanone in eight steps. The pivotal one involves a resolution, through the quinine- or quinidine-promoted methanolysis of the cyclic anhydride (±)-10, leading to chromatographically separable pairs of enantiomerically pure forms of regioisomeric methyl half esters.
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Affiliation(s)
- Christian G Blüchel
- Research School of Chemistry, Institute of Advanced Studies , The Australian National University , Canberra , Australian Capital Territory 2601 , Australia
| | - Jiri Mikusek
- Research School of Chemistry, Institute of Advanced Studies , The Australian National University , Canberra , Australian Capital Territory 2601 , Australia
| | - Anthony C Willis
- Research School of Chemistry, Institute of Advanced Studies , The Australian National University , Canberra , Australian Capital Territory 2601 , Australia
| | - Michael G Gardiner
- Research School of Chemistry, Institute of Advanced Studies , The Australian National University , Canberra , Australian Capital Territory 2601 , Australia
| | - Martin G Banwell
- Research School of Chemistry, Institute of Advanced Studies , The Australian National University , Canberra , Australian Capital Territory 2601 , Australia
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22
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Pham SQT, Assadawi N, Wells J, Sophocleous RA, Davis KJ, Yu H, Sluyter R, Dillon CT, Kelso C, Beck JL, Willis AC, Richardson C, Ralph SF. A new class of quadruplex DNA-binding nickel Schiff base complexes. Dalton Trans 2020; 49:4843-4860. [DOI: 10.1039/d0dt00319k] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A new nickel Schiff base complex shows selective binding behaviour towards quadruplex DNA and cytotoxicity against cancer cells.
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23
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Fares M, McCosker PM, Alsherbiny MA, Willis AC, Clark T, Neyts J, Jochmans D, Keller PA. Regioselective convergent synthesis of 2-arylidene thiazolo[3,2- a]pyrimidines as potential anti-chikungunya agents. RSC Adv 2020; 10:5191-5195. [PMID: 35498334 PMCID: PMC9049071 DOI: 10.1039/d0ra00257g] [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] [Received: 11/27/2019] [Accepted: 01/17/2020] [Indexed: 11/21/2022] Open
Abstract
Convergent and convenient regioselective synthesis of novel thiazolo[2,3-a]pyrimidine derivatives was accomplished using the one-pot reaction of 6-ethylthiouracil, bromoacetic acid, anhydrous sodium acetate, acetic anhydride, acetic acid and suitable aldehyde. X-ray crystallographic study reveals the presence of the Z configuration of only one regioisomer confirmed by computational studies as being the most likely isomer present. Convergent and convenient regioselective synthesis of novel thiazolo[2,3-a]pyrimidines was accomplished using the one-pot reaction of 6-ethylthiouracil, bromoacetic acid, anhydrous sodium acetate, acetic anhydride, acetic acid and suitable aldehyde.![]()
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Affiliation(s)
- Mohamed Fares
- School of Chemistry & Molecular Bioscience
- Molecular Horizons
- University of Wollongong
- Illawarra Health & Medical Research Institute
- Wollongong
| | - Patrick M. McCosker
- School of Chemistry & Molecular Bioscience
- Molecular Horizons
- University of Wollongong
- Illawarra Health & Medical Research Institute
- Wollongong
| | | | - Anthony C. Willis
- Research School of Chemistry
- The Australian National University
- Canberra
- Australia
| | - Timothy Clark
- Department of Chemistry and Pharmacy
- Computer-Chemistry-Center (CCC)
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
- 91052 Erlangen
- Germany
| | - Johan Neyts
- KU Leuven (University of Leuven)
- Department of Microbiology and Immunology
- Rega Institute for Medical Research
- Laboratory of Virology and Chemotherapy
- Leuven
| | - Dirk Jochmans
- KU Leuven (University of Leuven)
- Department of Microbiology and Immunology
- Rega Institute for Medical Research
- Laboratory of Virology and Chemotherapy
- Leuven
| | - Paul A. Keller
- School of Chemistry & Molecular Bioscience
- Molecular Horizons
- University of Wollongong
- Illawarra Health & Medical Research Institute
- Wollongong
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24
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Abernethy RJ, Foreman MRSJ, Hill AF, Smith MK, Willis AC. Relative hemilabilities of H2B(az)2 (az = pyrazolyl, dimethylpyrazolyl, methimazolyl) chelates in the complexes [M(η-C3H5)(CO)2{H2B(az)2}] (M = Mo, W). Dalton Trans 2020; 49:781-796. [DOI: 10.1039/c9dt03744f] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The question of B–H–Mo hemilability in a range of dihydrobis(azolyl)borate scorpionate ligands is discussed with reference to η3-allyl complexes [Mo(η3-C3H5)(CO)2{H2B(az)2}] [az = pyrazolyl (pz), dimethylpyrazolyl (pz*), mercaptoimidazolyl (mt)].
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Affiliation(s)
- Robyn J. Abernethy
- Research School of Chemistry
- The Australian National University
- Canberra
- Australia
| | - Mark R. St.-J. Foreman
- Nuclear Chemistry and Industrial Materials Recycling
- Chalmers University of Technology
- Göteborg
- Sweden
| | - Anthony F. Hill
- Research School of Chemistry
- The Australian National University
- Canberra
- Australia
| | - Matthew K. Smith
- Research School of Chemistry
- The Australian National University
- Canberra
- Australia
| | - Anthony C. Willis
- Research School of Chemistry
- The Australian National University
- Canberra
- Australia
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25
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Vafazadeh R, Kazemi-nasab A, Willis AC. Anion Modulated Structural Variations in Copper(II) Complexes with a Flexidentate Ligand Derived from 2-((2-aminoethyl)amino)ethan-1-ol: Synthesis and Spectroscopic and X-ray Structural Characterization. Acta Chim Slov 2019. [DOI: 10.17344/acsi.2019.5333] [Citation(s) in RCA: 2] [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: 11/19/2022] Open
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26
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Vafazadeh R, Kazemi-Nasab A, Willis AC. Anion Modulated Structural Variations in Copper(II) Complexes with a Flexidentate Ligand Derived from 2-((2-aminoethyl)amino)ethan-1-ol: Synthesis and Spectroscopic and X-ray Structural Characterization. Acta Chim Slov 2019; 66:1010-1018. [PMID: 34057507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023] Open
Abstract
Flexidentate ligand, HL has been prepared by the condensation of aminoethylethanolamine (AEEA) with benzoylacetone (bezac). On reaction with copper(II) salts it gives complexes CuLClO4.H2O (1), CuLN3 (2) and [Cu3L3Br]Br2.H2O (3). All complexes have been characterized by X-ray crystallography. The results show that the hydroxyl group of the flexidentate ligand can coordinate to the Cu(II) center or remain as an uncoordinated group. In (1), the coordination number around the copper(II) ion is five coordinated and the ligand is tetradentate with the OH group coordinated to the copper(II) ion. Complex (2) has a square planar geometry and the L- ligand is tridentate with the hydroxyl group left uncoordinated. The X-ray diffraction analysis of the trinuclear complex (3) shows that the copper(II) centers are five-coordinate and L- is a tetradentate ligand with the hydroxyl group being both terminal and bridging. The Hirshfeld surface analysis and the 2D fingerprint plot were used to analyze all of the intermolecular contacts in the crystal structures.
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27
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Bolte B, Bryan CS, Sharp PP, Sayyahi S, Rihouey C, Kendrick A, Lan P, Banwell MG, Jackson CJ, Fraser NJ, Willis AC, Ward JS. Total Syntheses of the 3H-Pyrrolo[2,3-c]quinolone-Containing Alkaloids Marinoquinolines A–F, K, and Aplidiopsamine A Using a Palladium-Catalyzed Ullmann Cross-Coupling/Reductive Cyclization Pathway. J Org Chem 2019; 85:650-663. [DOI: 10.1021/acs.joc.9b02725] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Benoit Bolte
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, ACT 2601, Australia
| | - Christopher S. Bryan
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, ACT 2601, Australia
| | - Phillip P. Sharp
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, ACT 2601, Australia
| | - Soheil Sayyahi
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, ACT 2601, Australia
| | - Charly Rihouey
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, ACT 2601, Australia
| | - Amy Kendrick
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, ACT 2601, Australia
| | - Ping Lan
- Institute for Advanced and Applied Chemical Synthesis, Jinan University, Guangzhou 510632, China
| | - Martin G. Banwell
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, ACT 2601, Australia
- Institute for Advanced and Applied Chemical Synthesis, Jinan University, Guangzhou 510632, China
| | - Colin J. Jackson
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, ACT 2601, Australia
| | - Nicholas J. Fraser
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, ACT 2601, Australia
| | - Anthony C. Willis
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, ACT 2601, Australia
| | - Jas S. Ward
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, ACT 2601, Australia
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28
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Thaima T, Willis AC, Pyne SG. Progress toward the total synthesis of 9β-hydroxyvertine: Construction of an advanced quinolizidine intermediate. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.130476] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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29
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Crisp AL, Noble B, Schwartz BD, Willis AC, Coote ML, Banwell MG. Front Cover: The Synthesis, Structural Characterisation and Chemical Manipulation of the [6+3] Cycloadduct Derived from α‐Tropolone
O
‐Methyl Ether and Trimethylenemethane (Asian J. Org. Chem. 8/2019). ASIAN J ORG CHEM 2019. [DOI: 10.1002/ajoc.201900404] [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: 11/09/2022]
Affiliation(s)
- Antony L. Crisp
- Research School of ChemistryInstitute of Advanced StudiesThe Australian National University Canberra, ACT 2601 Australia
| | - Benjamin Noble
- Research School of ChemistryInstitute of Advanced StudiesThe Australian National University Canberra, ACT 2601 Australia
- ARC Centre of Excellence for Electromaterials ScienceResearch School of ChemistryThe Australian National University Canberra, ACT 2601 Australia
| | - Brett D. Schwartz
- Research School of ChemistryInstitute of Advanced StudiesThe Australian National University Canberra, ACT 2601 Australia
| | - Anthony C. Willis
- Research School of ChemistryInstitute of Advanced StudiesThe Australian National University Canberra, ACT 2601 Australia
| | - Michelle L. Coote
- Research School of ChemistryInstitute of Advanced StudiesThe Australian National University Canberra, ACT 2601 Australia
- ARC Centre of Excellence for Electromaterials ScienceResearch School of ChemistryThe Australian National University Canberra, ACT 2601 Australia
| | - Martin G. Banwell
- Research School of ChemistryInstitute of Advanced StudiesThe Australian National University Canberra, ACT 2601 Australia
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30
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Butler NM, Bremner JB, Willis AC, Lucantoni L, Avery VM, Keller PA. Desymmetrization Reactions of Indigo with Grignard Reagents for the Synthesis of Selective Antiplasmodial [1H,3′H]-3-Aryl-2,2′-diindol-3′-ones. J Org Chem 2019; 84:11228-11239. [DOI: 10.1021/acs.joc.9b01442] [Citation(s) in RCA: 4] [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: 11/29/2022]
Affiliation(s)
- Nicholas M. Butler
- School of Chemistry & Molecular Bioscience, Molecular Horizons, University of Wollongong, and Illawarra Health & Medical Research Institute, Wollongong, New South Wales 2522, Australia
| | - John B. Bremner
- School of Chemistry & Molecular Bioscience, Molecular Horizons, University of Wollongong, and Illawarra Health & Medical Research Institute, Wollongong, New South Wales 2522, Australia
| | - Anthony C. Willis
- School of Chemistry, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Leonardo Lucantoni
- Discovery Biology, Griffith Institute for Drug Discovery, Griffith University, Brisbane Innovation Park, Don Young Road, Nathan, Queensland 4111, Australia
| | - Vicky M. Avery
- Discovery Biology, Griffith Institute for Drug Discovery, Griffith University, Brisbane Innovation Park, Don Young Road, Nathan, Queensland 4111, Australia
| | - Paul A. Keller
- School of Chemistry & Molecular Bioscience, Molecular Horizons, University of Wollongong, and Illawarra Health & Medical Research Institute, Wollongong, New South Wales 2522, Australia
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31
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Crisp AL, Noble B, Schwartz BD, Willis AC, Coote ML, Banwell MG. The Synthesis, Structural Characterisation and Chemical Manipulation of the [6+3] Cycloadduct Derived from α‐Tropolone
O
‐Methyl Ether and Trimethylenemethane. ASIAN J ORG CHEM 2019. [DOI: 10.1002/ajoc.201900334] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [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)
- Antony L. Crisp
- Research School of Chemistry Institute of Advanced Studies The Australian National University Canberra, ACT 2601 Australia
| | - Benjamin Noble
- Research School of Chemistry Institute of Advanced Studies The Australian National University Canberra, ACT 2601 Australia
- ARC Centre of Excellence for Electromaterials Science Research School of Chemistry The Australian National University Canberra, ACT 2601 Australia
| | - Brett D. Schwartz
- Research School of Chemistry Institute of Advanced Studies The Australian National University Canberra, ACT 2601 Australia
| | - Anthony C. Willis
- Research School of Chemistry Institute of Advanced Studies The Australian National University Canberra, ACT 2601 Australia
| | - Michelle L. Coote
- Research School of Chemistry Institute of Advanced Studies The Australian National University Canberra, ACT 2601 Australia
- ARC Centre of Excellence for Electromaterials Science Research School of Chemistry The Australian National University Canberra, ACT 2601 Australia
| | - Martin G. Banwell
- Research School of Chemistry Institute of Advanced Studies The Australian National University Canberra, ACT 2601 Australia
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32
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Nugraha AS, Wangchuk T, Willis AC, Haritakun R, Sujadmiko H, Keller PA. Phytochemical and Pharmacological Studies on Four Indonesian Epiphytic Medicinal Plants: Drynaria rigidula, Hydnophytum formicarum, Usnea misaminensis, and Calymperes schmidtii. Nat Prod Commun 2019. [DOI: 10.1177/1934578x19856792] [Citation(s) in RCA: 4] [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: 11/15/2022] Open
Affiliation(s)
- Ari S. Nugraha
- School of Chemistry and Molecular Bioscience, Molecular Horizons, University of Wollongong and Illawarra Health and Medical Research Institute, Australia
- Drug Utilisation and Discovery Research Group, Faculty of Pharmacy, University of Jember, Indonesia
| | - Tashi Wangchuk
- School of Chemistry and Molecular Bioscience, Molecular Horizons, University of Wollongong and Illawarra Health and Medical Research Institute, Australia
| | - Anthony C. Willis
- Research School of Chemistry, Australian National University, Canberra, Australia
| | - Rachada Haritakun
- National Centre for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Klong Luang, Pathumanthani, Thailand
| | - Heri Sujadmiko
- Faculty of Biology, Gadjah Mada University, Yogyakarta, Indonesia
| | - Paul A. Keller
- School of Chemistry and Molecular Bioscience, Molecular Horizons, University of Wollongong and Illawarra Health and Medical Research Institute, Australia
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33
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Chevis PJ, Wangngae S, Thaima T, Carroll AW, Willis AC, Pattarawarapan M, Pyne SG. Highly diastereoselective synthesis of enantioenriched anti-α-allyl-β-fluoroamines. Chem Commun (Camb) 2019; 55:6050-6053. [PMID: 31065637 DOI: 10.1039/c9cc02765c] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
A highly diastereoselective synthesis of anti-α-allyl-β-fluoroamines has been developed involving enantioselective α-fluorination of aldehydes followed by a diastereoselective Petasis allyl borono-Mannich reaction. The products are obtained generally in good overall yields for the two steps and with drs of 97 : 3-99 : 1 and ees of 86-92%. Selected products were converted to 3-, 5- and 6-membered ring heterocycles, the latter two types incorporating an exo-cyclic fluorine.
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Affiliation(s)
- Philip J Chevis
- School of Chemistry and Molecular Biosciences, University of Wollongong, Wollongong, New South Wales 2522, Australia.
| | - Sirilak Wangngae
- School of Chemistry and Molecular Biosciences, University of Wollongong, Wollongong, New South Wales 2522, Australia. and Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Thanaphat Thaima
- School of Chemistry and Molecular Biosciences, University of Wollongong, Wollongong, New South Wales 2522, Australia.
| | - Anthony W Carroll
- School of Chemistry and Molecular Biosciences, University of Wollongong, Wollongong, New South Wales 2522, Australia.
| | - Anthony C Willis
- Research School of Chemistry, Australian National University, Canberra, ACT 0200, Australia
| | - Mookda Pattarawarapan
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Stephen G Pyne
- School of Chemistry and Molecular Biosciences, University of Wollongong, Wollongong, New South Wales 2522, Australia.
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34
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Lan P, Banwell MG, Willis AC. Application of Electrocyclic Ring-Opening and Desymmetrizing Nucleophilic Trappings of meso-6,6-Dibromobicyclo[3.1.0]hexanes to Total Syntheses of Crinine and Haemanthamine Alkaloids. J Org Chem 2019; 84:3431-3466. [PMID: 30726669 DOI: 10.1021/acs.joc.9b00018] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The thermally induced electrocyclic ring-opening of C2-symmetric ( meso) 6,6-dibromobicyclo[3.1.0]hexanes such as 10 in the presence of the chiral, nonracemic 1°-amine 28 afforded a ca. 1:1 mixture of the diastereoisomeric and chromatographically separable 1-amino-2-bromo-2-cyclohexenes 37 (42%) and 38 (45%). Each of these was elaborated over 13 steps, including Suzuki-Miyaura cross-coupling, radical cyclization, and Pictet-Spengler reactions, into (-)- or (+)-crinane (1 or ent-1, respectively). Variations on these protocols were applied to the total syntheses of (+)- and (-)-11-hydroxyvattitine [(+)- and (-)-3], (+)- and (-)-bulbispermine [(+)- and (-)-4], (+)- and (-)-haemanthamine [(+)- and (-)-5], (+)- and (-)-pretazettine [(+)- and (-)-6], and (+)- and (-)-tazettine [(+)- and (-)-7] as well as (±)-hamayne [(±)-8] and (±)-apohaemanthamine [(±)-9]. A number of these alkaloids were synthesized for the first time.
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Affiliation(s)
- Ping Lan
- Institute for Advanced and Applied Chemical Synthesis , Jinan University , Zhuhai 519070 , China.,Department of Food Science and Engineering , Jinan University , Guangzhou 510632 , China
| | - Martin G Banwell
- Institute for Advanced and Applied Chemical Synthesis , Jinan University , Zhuhai 519070 , China.,Research School of Chemistry, Institute of Advanced Studies , The Australian National University , Canberra , ACT 2601 , Australia
| | - Anthony C Willis
- Research School of Chemistry, Institute of Advanced Studies , The Australian National University , Canberra , ACT 2601 , Australia
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35
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Abstract
Hyacinthacines C1 and C4 are natural products that were isolated from Hyacinthoides non-scripta and Scilla socialis in 1999 and 2007, respectively. Despite their different 1H NMR and 13C NMR spectroscopic data, these compounds have been assigned the same structures, including absolute configurations. This work details the total synthesis of natural (+)-hyacinthacine C1, whose structure is confirmed as being the C-6 epimer of that reported. The synthetic strategy focused on inverting the configuration at C-1 of the final hyacinthacines via operating the inversion at the corresponding carbon atom in three previously synthesized intermediates. To do this, the advanced intermediates were subjected to Swern oxidation, followed by a stereoselective reduction with L-Selectride. This approach led to the synthesis of (+)-5 -epi-hyacinthacine C1 (15), the corrected structure for (+)-hyacinthacine C1 (19), (+)-6,7-di- epi-hyacinthacine C1 (23), and (+)-7- epi-hyacinthacine C1 (29). Glycosidase inhibition assays revealed that (+)-hyacinthacine C1 (19) proved the most active, with IC50 values of 33.7, 55.5, and 78.2 μM, against the α-glucosidase of rice, human lysosome, and rat intestinal maltase, respectively.
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Affiliation(s)
- Anthony W Carroll
- School of Chemistry , University of Wollongong , Wollongong , New South Wales 2522 , Australia
| | - Anthony C Willis
- Research School of Chemistry , Australian National University , Canberra , ACT 2601 , Australia
| | - Masako Hoshino
- Department of Hospital Pharmacy , University of Toyama , Sugitani , Toyama 2630 , Japan
| | - Atsushi Kato
- Department of Hospital Pharmacy , University of Toyama , Sugitani , Toyama 2630 , Japan
| | - Stephen G Pyne
- School of Chemistry , University of Wollongong , Wollongong , New South Wales 2522 , Australia
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36
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Auranwiwat C, Wongsomboon P, Thaima T, Rattanajak R, Kamchonwongpaisan S, Willis AC, Laphookhieo S, Pyne SG, Limtharakul T. Polyoxygenated Cyclohexenes and Their Chlorinated Derivatives from the Leaves of Uvaria cherrevensis. J Nat Prod 2019; 82:101-110. [PMID: 30608167 DOI: 10.1021/acs.jnatprod.8b00794] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
The chemical study of leaf extracts from Uvaria cherrevensis resulted in the identification of 11 new polyoxygenated cyclohexenes, cherrevenols A-K (1-11), and a new seco-cyclohexene derivative, cherrevenol L (12). Nine known compounds (13-21) were also isolated. Three of the isolated compounds are chlorinated polyoxygenated cyclohexenes. The structures of these compounds were determined using spectroscopic methods and, in some cases (compounds 2, 6, 8, and 10), single-crystal X-ray crystallographic structural analysis or chemical correlation (compounds 6 and 7). Compounds 6 and 7 were both isolated as scalemic mixtures (ee 23-24%).
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Affiliation(s)
- Chiramet Auranwiwat
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, the Graduate School and Research Center on Chemistry for Development of Health Promoting Products from Northern Resources , Chiang Mai University , Chiang Mai 50200 , Thailand
- School of Chemistry , University of Wollongong , Wollongong , New South Wales 2522 , Australia
| | - Puttandon Wongsomboon
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, the Graduate School and Research Center on Chemistry for Development of Health Promoting Products from Northern Resources , Chiang Mai University , Chiang Mai 50200 , Thailand
| | - Thanaphat Thaima
- School of Chemistry , University of Wollongong , Wollongong , New South Wales 2522 , Australia
| | - Roonglawan Rattanajak
- Medical Molecular Biology Research Unit , National Center for Genetic Engineering and Biotechnology , National Science and Technology Development Agency, Thailand Science Park , Pathumthani 12120 , Thailand
| | - Sumalee Kamchonwongpaisan
- Medical Molecular Biology Research Unit , National Center for Genetic Engineering and Biotechnology , National Science and Technology Development Agency, Thailand Science Park , Pathumthani 12120 , Thailand
| | - Anthony C Willis
- Research School of Chemistry, Australia National University , Canberra , ACT 2601 , Australia
| | - Surat Laphookhieo
- Center of Chemical Innovation for Sustainability (CIS) and School of Science, Mae Fah Luang University , Tasud, Muang , Chiang Rai 57100 , Thailand
| | - Stephen G Pyne
- School of Chemistry , University of Wollongong , Wollongong , New South Wales 2522 , Australia
| | - Thunwadee Limtharakul
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, the Graduate School and Research Center on Chemistry for Development of Health Promoting Products from Northern Resources , Chiang Mai University , Chiang Mai 50200 , Thailand
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37
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Ryder GM, Wille U, Willis AC, Pyne SG. 1,2-Addition versus homoconjugate addition reactions of indoles and electron-rich arenes to α-cyclopropyl N-acyliminium ions: synthetic and computational studies. Org Biomol Chem 2019; 17:7025-7035. [DOI: 10.1039/c9ob01363f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [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
α-Cyclopropyl-N-acyliminium ions towards reaction with indoles to give 5-(3-indoyl)-5-cyclopropylpyrrolidin-2-ones and, in the case of highly electron deficient indoles and electron rich arenes, spiroheterocycles.
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Affiliation(s)
- Greg M. Ryder
- School of Chemistry and Molecular Bioscience
- University of Wollongong
- Wollongong
- Australia
| | - Uta Wille
- School of Chemistry
- Bio21 Institute
- University of Melbourne
- Parkville
- Australia
| | - Anthony C. Willis
- Research School of Chemistry
- Australian National University
- Canberra
- Australia
| | - Stephen G. Pyne
- School of Chemistry and Molecular Bioscience
- University of Wollongong
- Wollongong
- Australia
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38
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Bolte B, Tang F, Lan P, Willis AC, Banwell MG. Synthetic Studies on the Marine-Derived Sesquiterpene (+)-Viridianol: Divergent Behaviour of Two Structurally Related, Ring-Fused Cyclopropanes Under the Same Hydrogenolytic Conditions. Aust J Chem 2019. [DOI: 10.1071/ch18532] [Citation(s) in RCA: 2] [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: 01/12/2023]
Abstract
Hydrogenolytic cleavage of the ring-fused cyclopropane 11 using hydrogen in the presence of platinum oxide afforded the gem-dimethylated cyclohexane 12 in 99% yield. In contrast, analogous treatment of congener 13 afforded only trace amounts of the targeted and gem-dimethylated sesquiterpene (+)-viridianol (1), the major products of reaction now being the vic-dimethylated compound 14 and the 2-fold ring-cleavage product 15.
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39
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Sharp PP, Mikusek J, Ho J, Krenske EH, Banwell MG, Coote ML, Ward JS, Willis AC. Mechanistic Studies on the Base-Promoted Conversion of Alkoxy-Substituted, Ring-Fused gem-Dihalocyclopropanes into Furans: Evidence for a Process Involving Electrocyclic Ring Closure of a Carbonyl Ylide Intermediate. J Org Chem 2018; 83:13678-13690. [PMID: 30281974 DOI: 10.1021/acs.joc.8b01766] [Citation(s) in RCA: 6] [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: 11/29/2022]
Abstract
The mechanism associated with the base-promoted conversion of alkoxy-substituted and ring-fused gem-dihalocyclopropanes such as 40 into annulated furans has been explored. Treatment of compound 40 with potassium tert-butoxide affords a mixture of furans 23/27 and 41, an outcome that suggests the intermediacy of the slowly interconverting carbonyl ylides 42 and 43 that undergo rapid [1,5]-electrocyclizations and subsequent dehydrohalogenation to afford the observed products. This proposal is supported by ab initio MO and DFT calculations that also suggest a vinylcarbene insertion pathway is less likely to be operative.
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Affiliation(s)
- Phillip P Sharp
- Research School of Chemistry, Institute of Advanced Studies , The Australian National University , Canberra , ACT 2601 , Australia
| | - Jiri Mikusek
- Research School of Chemistry, Institute of Advanced Studies , The Australian National University , Canberra , ACT 2601 , Australia
| | - Junming Ho
- Research School of Chemistry, Institute of Advanced Studies , The Australian National University , Canberra , ACT 2601 , Australia.,School of Chemistry , The University of New South Wales , Sydney , NSW 2052 , Australia
| | - Elizabeth H Krenske
- Research School of Chemistry, Institute of Advanced Studies , The Australian National University , Canberra , ACT 2601 , Australia
| | - Martin G Banwell
- Research School of Chemistry, Institute of Advanced Studies , The Australian National University , Canberra , ACT 2601 , Australia
| | - Michelle L Coote
- Research School of Chemistry, Institute of Advanced Studies , The Australian National University , Canberra , ACT 2601 , Australia.,ARC Centre of Excellence for Electromaterials Science, Research School of Chemistry , The Australian National University , Canberra ACT 2601 , Australia
| | - Jas S Ward
- Research School of Chemistry, Institute of Advanced Studies , The Australian National University , Canberra , ACT 2601 , Australia
| | - Anthony C Willis
- Research School of Chemistry, Institute of Advanced Studies , The Australian National University , Canberra , ACT 2601 , Australia
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40
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Tang F, Lan P, Bolte B, Banwell MG, Ward JS, Willis AC. Total Synthesis of (+)-Viridianol, a Marine-Derived Sesquiterpene Embodying the Decahydrocyclobuta[d]indene Framework. J Org Chem 2018; 83:14049-14056. [DOI: 10.1021/acs.joc.8b02626] [Citation(s) in RCA: 11] [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: 12/17/2022]
Affiliation(s)
- Fei Tang
- Research School of Chemistry, Institute of Advanced Studies The Australian National University, Canberra, ACT 2601, Australia
| | - Ping Lan
- Research School of Chemistry, Institute of Advanced Studies The Australian National University, Canberra, ACT 2601, Australia
| | - Benoit Bolte
- Research School of Chemistry, Institute of Advanced Studies The Australian National University, Canberra, ACT 2601, Australia
| | - Martin G. Banwell
- Research School of Chemistry, Institute of Advanced Studies The Australian National University, Canberra, ACT 2601, Australia
| | - Jas S. Ward
- Research School of Chemistry, Institute of Advanced Studies The Australian National University, Canberra, ACT 2601, Australia
| | - Anthony C. Willis
- Research School of Chemistry, Institute of Advanced Studies The Australian National University, Canberra, ACT 2601, Australia
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41
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Vafazadeh R, Namazian M, Shahpoori-Arani B, Willis AC, Carr PD. Synthesis, X-ray Structural Characterization, and DFT Calculations of Mononuclear Nickel(II) Complexes Containing Diamine and Methacrylate Ligands. Acta Chim Slov 2018; 65:372-379. [DOI: 10.17344/acsi.2017.4096] [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: 11/19/2022] Open
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42
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Lan P, Banwell MG, Willis AC. Total Synthesis of (±)-Crinane from 6,6-Dibromobicyclo[3.1.0]hexane Using a 5- exo- trig Radical Cyclization Reaction to Assemble the C3a-Arylated Perhydroindole Substructure. J Org Chem 2018; 83:8493-8498. [PMID: 29792804 DOI: 10.1021/acs.joc.8b01088] [Citation(s) in RCA: 6] [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: 11/29/2022]
Abstract
Crinane embodies the tetracyclic framework associated with some of the most common Amaryllidaceae alkaloids. It has now been prepared in 10 steps from 6,6-dibromobicyclo[3.1.0]hexane (2). The initial step involves the thermally induced electrocyclic ring opening of cyclopropane 3 and capture of the resulting π-allyl cation with benzylamine to give an allylic amine that is readily elaborated to the 3°-amine 10. This last compound was engaged in a 5- exo- trig free radical cyclization reaction to give the C3a-arylated perhydroindole 11. Compound 11 was then converted, over two steps, into (±)-crinane, the hydrochloride salt of which has been subjected to single-crystal X-ray analysis.
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Affiliation(s)
- Ping Lan
- Department of Food Science and Engineering , Jinan University , Guangzhou , 510632 , China
| | - Martin G Banwell
- Research School of Chemistry , Institute of Advanced Studies, The Australian National University , Canberra , ACT 2601 , Australia.,College of Pharmacy , Jinan University , Guangzhou , 510632 , China
| | - Anthony C Willis
- Research School of Chemistry , Institute of Advanced Studies, The Australian National University , Canberra , ACT 2601 , Australia
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43
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Carroll AW, Savaspun K, Willis AC, Hoshino M, Kato A, Pyne SG. Total Synthesis of Natural Hyacinthacine C 5 and Six Related Hyacinthacine C 5 Epimers. J Org Chem 2018; 83:5558-5576. [PMID: 29701065 DOI: 10.1021/acs.joc.8b00585] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The total synthesis of natural (+)-hyacinthacine C5 was achieved, which allowed correction of its initially proposed structure, as well as six additional hyacinthacine C-type compounds. These compounds were readily accessible from two epimeric anti-1,2-amino alcohols. Keeping a common A-ring configuration, chemical manipulation occurred selectively on the B-ring of the hyacinthacine C-type products through methods of syn-dihydroxylation, SN2 ring-opening of a cyclic sulfate, and also employing either ( R)- or ( R, S)-α-methylallyl amine for the Petasis borono Mannich reaction. Our small analogue library was then assessed for its glycosidase inhibitory potency against a panel of glycosidases. (-)-6- Epi-hyacinthacine C5 and (+)-7- epi-hyacinthacine C5 (compound names are based on the corrected structure of hyacinthacine C5) proved most active, with inhibitory activities ranging between weak (IC50 = 130 μM) and moderate (IC50 = 9.9 μM) against the α-glucosidases of rat intestinal maltase, isomaltase, and sucrase, thus identifying potential new leads for future antidiabetic drug development.
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Affiliation(s)
- Anthony W Carroll
- School of Chemistry, University of Wollongong , Wollongong , New South Wales 2522 , Australia
| | - Kongdech Savaspun
- School of Chemistry, University of Wollongong , Wollongong , New South Wales 2522 , Australia
| | - Anthony C Willis
- Research School of Chemistry, Australian National University , Canberra , ACT 0200 , Australia
| | - Masako Hoshino
- Department of Hospital Pharmacy , University of Toyama , Sugitani , Toyama 2630 , Japan
| | - Atsushi Kato
- Department of Hospital Pharmacy , University of Toyama , Sugitani , Toyama 2630 , Japan
| | - Stephen G Pyne
- School of Chemistry, University of Wollongong , Wollongong , New South Wales 2522 , Australia
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44
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Lan P, Herlt AJ, Willis AC, Taylor WC, Mander LN. Structures of New Alkaloids from Rain Forest Trees Galbulimima belgraveana and Galbulimima baccata in Papua New Guinea, Indonesia, and Northern Australia. ACS Omega 2018; 3:1912-1921. [PMID: 31458503 PMCID: PMC6641496 DOI: 10.1021/acsomega.7b02065] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Accepted: 01/31/2018] [Indexed: 06/10/2023]
Abstract
Following on our 60-year research on the chemical constituents of the rain forest trees Galbulimima belgraveana and Galbulimima baccata, we report the isolation of seven new alkaloids: GB14 (14), GB22 (15), GB25 (16), GB21 (17), GB23 (18), GB24 (19), and GB26 (20). Their structures were elucidated by a combination of spectroscopic analyses and single-crystal X-ray crystallography, as well as structure degradation and interconversion. The newly isolated alkaloids are precursors or derivatives of the known family members from our early studies and could be intermediates in the biosynthesis of the Galbulimima alkaloids. Therefore, the present study has expanded the range of structures in this family of alkaloids and provided some missing links in the biosynthetic sequences.
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Affiliation(s)
- Ping Lan
- Department
of Food Science and Engineering, Jinan University, Guangzhou 510632, China
| | - Anthony J. Herlt
- Research
School of Chemistry, Australian National
University, Canberra, Australian Capital Territory 2601, Australia
| | - Anthony C. Willis
- Research
School of Chemistry, Australian National
University, Canberra, Australian Capital Territory 2601, Australia
| | - Walter C. Taylor
- School
of Chemistry, University of Sydney, Sydney, New South Wales 2006, Australia
| | - Lewis N. Mander
- Research
School of Chemistry, Australian National
University, Canberra, Australian Capital Territory 2601, Australia
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45
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Butler NM, Hendra R, Bremner JB, Willis AC, Lucantoni L, Avery VM, Keller PA. Cascade reactions of indigo with oxiranes and aziridines: efficient access to dihydropyrazinodiindoles and spiro-oxazocinodiindoles. Org Biomol Chem 2018; 16:6006-6016. [DOI: 10.1039/c8ob00865e] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Cascade reactions of indigo with strained electrophiles affords access to previously unknown oxazocino, pyrazino, and diazepino diindoles with selective anti-plasmodial activity.
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Affiliation(s)
| | - Rudi Hendra
- School of Chemistry
- University of Wollongong
- Wollongong
- Australia
| | - John B. Bremner
- School of Chemistry
- University of Wollongong
- Wollongong
- Australia
| | - Anthony C. Willis
- Research School of Chemistry
- The Australian National University
- Canberra
- Australia
| | - Leonardo Lucantoni
- Eskitis Institute for Drug Discovery
- Griffith University
- Nathan 4111
- Australia
| | - Vicky M. Avery
- Eskitis Institute for Drug Discovery
- Griffith University
- Nathan 4111
- Australia
| | - Paul A. Keller
- School of Chemistry
- University of Wollongong
- Wollongong
- Australia
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46
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Muhammad RN, Chang EL, Draffan AG, Willis AC, Carr PD, Banwell MG. Chemoenzymatic Syntheses of Some Analogues of the Tricarbocyclic Core of the Anti-Bacterial Agent Platencin and the Biological Evaluation of Certain of their N-Arylpropionamide Derivatives. Aust J Chem 2018. [DOI: 10.1071/ch18145] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A range of structural variations on the tricarbocyclic core 2 of the anti-bacterial agent platencin 1, including those represented by compounds 14, 15, and 27, have been prepared and certain of these elaborated, through substrate-controlled enolate alkylation reactions, to analogues of the natural product. Preliminary biological evaluation of these analogues revealed that they are only weakly active anti-infective agents.
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47
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Davis KJ, Assadawi NMO, Pham SQT, Birrento ML, Richardson C, Beck JL, Willis AC, Ralph SF. Effect of structure variations on the quadruplex DNA binding ability of nickel Schiff base complexes. Dalton Trans 2018; 47:13573-13591. [DOI: 10.1039/c8dt02727g] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The synthesis of two new series of nickel complexes is described, along with their ability to bind to duplex and quadruplex DNA structures.
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Affiliation(s)
| | | | | | | | | | | | - Anthony C. Willis
- Research School of Chemistry
- Australian National University
- Canberra
- Australia
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48
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Abstract
Herein we report the formation of pyrrolines and tetrahydropyridines from the cyclisation reactions of β-amino allenes by both AuI and AgI catalysts in yields ranging from 5 to 70 %. AuI catalysts favour a 5-endo-dig cyclisation before rapid rearrangement to the 5-exo-dig product, while AgI favours a 6-endo-trig cyclisation. We also report the first known Ag2O catalysed cyclisation reaction of an allene which occurred in good yield (61 %).
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49
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Nugent J, Matoušová E, Banwell MG, Willis AC. The Palladium-Catalyzed Intramolecular Alder-Ene Reactions of O- and N-Linked 1,6-Enynes Incorporating Triethylsilyl Capping Groups. J Org Chem 2017; 82:12569-12589. [PMID: 29065263 DOI: 10.1021/acs.joc.7b02355] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A series of O- and N-linked 1,6-enynes (e.g., 11) have been prepared with each subjected to a palladium-catalyzed intramolecular Alder-ene (IMAE) reaction, thus producing the isomeric and cyclic 1,4-diene (e.g., 12). These processes proceed most effectively when a triethylsilyl group is attached to the alkyne moiety and so generating alkenylsilanes that can be manipulated in various useful ways, including via iododesilylation (to give, for example, iodoalkene 62).
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Affiliation(s)
- Jeremy Nugent
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University , Canberra, ACT 2601, Australia
| | - Eliška Matoušová
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University , Canberra, ACT 2601, Australia
| | - Martin G Banwell
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University , Canberra, ACT 2601, Australia
| | - Anthony C Willis
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University , Canberra, ACT 2601, Australia
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Xu X, Kim HS, Chen WM, Ma X, Correy GJ, Banwell MG, Jackson CJ, Willis AC, Carr PD. Total Syntheses of the Amaryllidaceae Alkaloids Zephycandidine III and Lycosinine A and Their Evaluation as Inhibitors of Acetylcholinesterase. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700705] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Xingjun Xu
- College of Pharmacy; Jinan University; 510632 Guangzhou People's Republic of China
- Research School of Chemistry; Institute of Advanced Studies; The Australian National University; ACT 2601 Canberra Australia
| | - Hye-Sun Kim
- Research School of Chemistry; Institute of Advanced Studies; The Australian National University; ACT 2601 Canberra Australia
| | - Wei-Min Chen
- College of Pharmacy; Jinan University; 510632 Guangzhou People's Republic of China
| | - Xiang Ma
- Research School of Chemistry; Institute of Advanced Studies; The Australian National University; ACT 2601 Canberra Australia
| | - Galen J. Correy
- Research School of Chemistry; Institute of Advanced Studies; The Australian National University; ACT 2601 Canberra Australia
| | - Martin G. Banwell
- Research School of Chemistry; Institute of Advanced Studies; The Australian National University; ACT 2601 Canberra Australia
| | - Colin J. Jackson
- Research School of Chemistry; Institute of Advanced Studies; The Australian National University; ACT 2601 Canberra Australia
| | - Anthony C. Willis
- Research School of Chemistry; Institute of Advanced Studies; The Australian National University; ACT 2601 Canberra Australia
| | - Paul D. Carr
- Research School of Chemistry; Institute of Advanced Studies; The Australian National University; ACT 2601 Canberra Australia
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