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D'Arcy TD, Elsegood MRJ, Buckley BR. Organocatalytic Enantioselective Synthesis of Bicyclo[2.2.2]octenones via Oxaziridinium Catalysed
ortho
‐Hydroxylative Phenol Dearomatization**. Angew Chem Int Ed Engl 2022; 61:e202205278. [PMID: 35543699 PMCID: PMC9401573 DOI: 10.1002/anie.202205278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Indexed: 11/12/2022]
Abstract
Hydroxylative dearomatization reactions of phenols (HPD) offer an efficient way to assemble complex, biologically relevant scaffolds. Despite this, enantioselective hydroxylative phenol dearomatizations for the construction of bicyclo[2.2.2]octenones are classically limited to stoichiometric chiral reagents, and a practical, enantioselective catalytic method has remained elusive. Herein, we describe a highly enantioselective, organocatalytic tandem o‐HPD‐[4+2] reaction. Our methodology utilizes a chiral oxaziridinium organocatalyst, that is available in both enantiomeric forms, to afford dearomatized products in high enantioselectivity over a range of phenol substitution patterns. This approach was applied to the highly enantioselective synthesis of (+)‐biscarvacrol (99 : 1 e.r.) and (−)‐bis(2,6‐xylenol) (94 : 6 e.r.). The practicality of our conditions was demonstrated at gram‐scale, using an amine precatalyst, accessible in a single synthetic step.
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Affiliation(s)
- Tom D. D'Arcy
- Department of Chemistry Loughborough University Loughborough, Leicestershire LE11 3TU UK
| | - Mark R. J. Elsegood
- Department of Chemistry Loughborough University Loughborough, Leicestershire LE11 3TU UK
| | - Benjamin R. Buckley
- Department of Chemistry Loughborough University Loughborough, Leicestershire LE11 3TU UK
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D'Arcy TD, Elsegood MRJ, Buckley BR. Organocatalytic Enantioselective Synthesis of Bicyclo[2.2.2]octenones via Oxaziridinium Catalysed
ortho
‐Hydroxylative Phenol Dearomatization**. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202205278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Tom D. D'Arcy
- Department of Chemistry Loughborough University Loughborough, Leicestershire LE11 3TU UK
| | - Mark R. J. Elsegood
- Department of Chemistry Loughborough University Loughborough, Leicestershire LE11 3TU UK
| | - Benjamin R. Buckley
- Department of Chemistry Loughborough University Loughborough, Leicestershire LE11 3TU UK
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3
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Synthesis of pleiogenone A and 2,3-dihydropleiogenone A: Identification of the pleiogenone pharmacophore. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.153393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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4
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Takagi A, Usuguchi K, Takashima I, Okuda K. Total Synthesis of Antiausterity Agent (±)-Uvaridacol L by Regioselective Axial Diacylation of a myo-Inositol Orthoester. Org Lett 2021; 23:4083-4087. [PMID: 33596082 DOI: 10.1021/acs.orglett.1c00079] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The antiausterity natural product (±)-uvaridacol L was synthesized for the first time in seven steps from myo-inositol. The key reaction of this synthesis, axial selective dibenzoylation of myo-inositol orthoformate, was achieved using a catalytic amount of tetrabutylammonium fluoride (TBAF). The preferential cytotoxicity of racemic uvaridacol L against cancer cell lines able to adapt to nutrient deprivation was also evaluated under nutrient deprived conditions. Morphological evaluation was also carried out.
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Affiliation(s)
- Akira Takagi
- Laboratory of Bioorganic & Natural Products Chemistry, Kobe Pharmaceutical University, 4-19-1 Motoyamakita, Higashinada, Kobe, Hyogo 658-8558, Japan
| | - Kazuki Usuguchi
- Laboratory of Bioorganic & Natural Products Chemistry, Kobe Pharmaceutical University, 4-19-1 Motoyamakita, Higashinada, Kobe, Hyogo 658-8558, Japan
| | - Ippei Takashima
- Laboratory of Bioorganic & Natural Products Chemistry, Kobe Pharmaceutical University, 4-19-1 Motoyamakita, Higashinada, Kobe, Hyogo 658-8558, Japan
| | - Kensuke Okuda
- Laboratory of Bioorganic & Natural Products Chemistry, Kobe Pharmaceutical University, 4-19-1 Motoyamakita, Higashinada, Kobe, Hyogo 658-8558, Japan
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Alexander BE, Sun S, Palframan MJ, Kociok‐Köhn G, Dibwe DF, Watanabe S, Caggiano L, Awale S, Lewis SE. Sidechain Diversification of Grandifloracin Allows Identification of Analogues with Enhanced Anti-Austerity Activity against Human PANC-1 Pancreatic Cancer Cells. ChemMedChem 2020; 15:125-135. [PMID: 31821731 PMCID: PMC7003952 DOI: 10.1002/cmdc.201900549] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 11/11/2019] [Indexed: 12/25/2022]
Abstract
The natural product (+)-grandifloracin is a potent "anti-austerity" agent, able to suppress the ability of various pancreatic cancer cell lines to tolerate conditions of nutrient deprivation. Such anti-austerity agents represent a promising approach to cancer chemotherapy. Here we report the synthesis and biological evaluation of racemic analogues of grandifloracin bearing diverse sidechains, of which two show enhanced potency in comparison with the natural product. Additionally, several unexpected by-products containing modifications of the grandifloracin core were isolated, identified and similarly evaluated for biological activity.
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Affiliation(s)
| | - Sijia Sun
- Institute of Natural MedicineUniversity of Toyama2630 SugitaniToyama930-0194Japan
| | | | - Gabriele Kociok‐Köhn
- Materials and Chemical Characterisation Facility (MC)University of BathBathBA2 7AYUK
| | - Dya Fita Dibwe
- Institute of Natural MedicineUniversity of Toyama2630 SugitaniToyama930-0194Japan
| | - Shiro Watanabe
- Institute of Natural MedicineUniversity of Toyama2630 SugitaniToyama930-0194Japan
| | - Lorenzo Caggiano
- Department of Pharmacy and PharmacologyUniversity of BathBathBA2 7AYUK
| | - Suresh Awale
- Institute of Natural MedicineUniversity of Toyama2630 SugitaniToyama930-0194Japan
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6
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Production of enantiopure β-amino-γ-hydroxyesters from benzoic acid by a selective formal aminohydroxylation. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.04.048] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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7
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Awale S, Tawila AM, Dibwe DF, Ueda JY, Sun S, Athikomkulchai S, Balachandran C, Saiki I, Matsumoto K, Esumi H. Highly oxygenated antiausterity agents from the leaves of Uvaria dac. Bioorg Med Chem Lett 2017; 27:1967-1971. [DOI: 10.1016/j.bmcl.2017.03.021] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Revised: 02/24/2017] [Accepted: 03/09/2017] [Indexed: 02/02/2023]
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8
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Taher ES, Guest P, Benton A, Ma X, Banwell MG, Willis AC, Seiser T, Newton TW, Hutzler J. The Synthesis of Certain Phomentrioloxin A Analogues and Their Evaluation as Herbicidal Agents. J Org Chem 2016; 82:211-233. [DOI: 10.1021/acs.joc.6b02372] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Ehab S. Taher
- Research
School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Prue Guest
- Research
School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Amanda Benton
- Research
School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Xinghua Ma
- 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
| | - Anthony C. Willis
- Research
School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Tobias Seiser
- BASF SE, Carl-Boschstrasse
38, Ludwigshafen 67056, Germany
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Farley CM, Dibwe DF, Ueda JY, Hall EA, Awale S, Magolan J. Evaluation of synthetic coumarins for antiausterity cytotoxicity against pancreatic cancers. Bioorg Med Chem Lett 2016; 26:1471-4. [PMID: 26832787 DOI: 10.1016/j.bmcl.2016.01.054] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Revised: 01/14/2016] [Accepted: 01/19/2016] [Indexed: 01/15/2023]
Abstract
A series of functionalized coumarins were synthesized and evaluated for their capacity to inhibit the resistance to starvation of pancreatic cancer cells. This form of cytotoxicity, termed 'antiausterity' activity, was evaluated using a preferential cytotoxicity assay that compared cell survival in nutrient poor and nutrient rich conditions. Six of the seventeen compounds showed weak antiausterity activity against PANC-1. Compound 34 was active against PANC-1, MIA PaCa-2, and Capan-1 cancer cell lines. All of the compounds tested were simplified structural analogs of previously reported natural product leads. Six of the compounds, including 34, contain functionalized triazoles as novel potential bioisosteres of the side chain of the natural product angelmarin. Overall, the analogs were found to have low antiausterity activity relative to the corresponding natural products.
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Affiliation(s)
- Conner M Farley
- Department of Chemistry, University of Idaho, Moscow, ID 83844-2343, USA
| | - Dya Fita Dibwe
- Division of Natural Drug Discovery, Institute of Natural Medicine, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan
| | - Jun-ya Ueda
- Division of Natural Drug Discovery, Institute of Natural Medicine, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan
| | - Eric A Hall
- Department of Chemistry, University of Idaho, Moscow, ID 83844-2343, USA
| | - Suresh Awale
- Division of Natural Drug Discovery, Institute of Natural Medicine, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan
| | - Jakob Magolan
- Department of Chemistry, University of Idaho, Moscow, ID 83844-2343, USA
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Tricarbonyliron(0) complexes of bio-derived η4 cyclohexadiene ligands: An approach to analogues of oseltamivir. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2015.09.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Bergner M, Duquette DC, Chio L, Stoltz BM. Exceedingly Efficient Synthesis of (±)-Grandifloracin and Acylated Analogues. Org Lett 2015; 17:3008-10. [PMID: 26060887 DOI: 10.1021/acs.orglett.5b01292] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A highly efficient regio- and stereoselective total synthesis of (±)-grandifloracin via a tandem dearomative epoxidation/spontaneous Diels-Alder cyclodimerization from salicylic acid in only four steps is reported. The synthetic route allows for late-stage diversification of the core structure to give ready access to analogues of this promising agent against pancreatic cancer.
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Affiliation(s)
- Magnus Bergner
- The Warren and Katharine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, MC 101-20, Pasadena, California 91125, United States
| | - Douglas C Duquette
- The Warren and Katharine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, MC 101-20, Pasadena, California 91125, United States
| | - Linda Chio
- The Warren and Katharine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, MC 101-20, Pasadena, California 91125, United States
| | - Brian M Stoltz
- The Warren and Katharine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, MC 101-20, Pasadena, California 91125, United States
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Chittimalla SK, Laxmi S, Ming Liing AC, Kai Jun JL, Kuppusamy R, Putturu S, Bandi C. An approach towards expanding the scope of masked o-benzoquinone dimers to generate diverse compound libraries. RSC Adv 2015. [DOI: 10.1039/c5ra03627e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In this report, a simple and rapid approach for the synthesis of masked o-benzoquinone (MOB) heterodimers is presented.
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Affiliation(s)
| | - Shoba Laxmi
- School of Chemical & Life Sciences
- Singapore Polytechnic
- Singapore 139651
| | | | | | - Rajesh Kuppusamy
- Medicinal Chemistry Department
- AMRI Singapore Research Centre
- Singapore 117525
| | - Sireesha Putturu
- Medicinal Chemistry Department
- AMRI Singapore Research Centre
- Singapore 117525
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