1
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Saisin S, Panthong K, Hongthong S, Kuhakarn C, Thanasansurapong S, Chairoungdua A, Suksen K, Akkarawongsapat R, Napaswad C, Prabpai S, Nuntasaen N, Reutrakul V. Pyranonaphthoquinones and Naphthoquinones from the Stem Bark of Ventilago harmandiana and Their Anti-HIV-1 Activity. JOURNAL OF NATURAL PRODUCTS 2023; 86:498-507. [PMID: 36787536 PMCID: PMC10043937 DOI: 10.1021/acs.jnatprod.2c00980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Indexed: 06/18/2023]
Abstract
Seven previously undescribed compounds, including five pyranonaphthoquinones (ventilanones L-P) and two naphthoquinones (ventilanones Q and R), along with 15 known compounds were isolated from the stem bark of Ventilago harmandiana (Rhamnaceae). The structures were established by extensive analysis of their spectroscopic data. The absolute configuration of ventilanone L was established from single crystal X-ray crystallographic analysis using Cu Kα radiation and from its electronic circular dichroism data. Anti-HIV-1 activity using a syncytium inhibition assay and the cytotoxic activities of some isolated compounds were evaluated. Compounds 12, 13, 15, and 16 showed activity against syncytium formation with half maximal effective concentration (EC50) values ranging from 9.9 to 47 μM (selectivity index (SI) 2.4-4.5).
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Affiliation(s)
- Suwannee Saisin
- Department
of Chemistry and Center of Excellence for Innovation in Chemistry
(PERCH-CIC), Faculty of Science, Mahidol
University, Rama VI Road, Bangkok 10400, Thailand
| | - Kanda Panthong
- Division
of Physical Sciences and Center of Excellence for Innovation in Chemistry
(PERCH-CIC), Faculty of Science, Prince
of Songkla University, Songkhla 90112, Thailand
| | - Sakchai Hongthong
- Division
of Chemistry, Faculty of Science and Technology, Rajabhat Rajanagarindra University, Chachoengsao 24000, Thailand
| | - Chutima Kuhakarn
- Department
of Chemistry and Center of Excellence for Innovation in Chemistry
(PERCH-CIC), Faculty of Science, Mahidol
University, Rama VI Road, Bangkok 10400, Thailand
| | - Sariyarach Thanasansurapong
- Department
of Chemistry and Center of Excellence for Innovation in Chemistry
(PERCH-CIC), Faculty of Science, Mahidol
University, Rama VI Road, Bangkok 10400, Thailand
| | - Arthit Chairoungdua
- Department
of Physiology, Faculty of Science, Mahidol
University, Rama VI Road, Bangkok 10400, Thailand
| | - Kanoknetr Suksen
- Department
of Physiology, Faculty of Science, Mahidol
University, Rama VI Road, Bangkok 10400, Thailand
| | - Radeekorn Akkarawongsapat
- Department
of Microbiology, Faculty of Science, Mahidol
University, Rama VI Road, Bangkok 10400, Thailand
| | - Chanita Napaswad
- Department
of Microbiology, Faculty of Science, Mahidol
University, Rama VI Road, Bangkok 10400, Thailand
| | - Samran Prabpai
- Department
of Chemistry and Center of Excellence for Innovation in Chemistry
(PERCH-CIC), Faculty of Science, Mahidol
University, Rama VI Road, Bangkok 10400, Thailand
| | - Narong Nuntasaen
- The Forest
Herbarium National Park, Wildlife and Plant Conservation Department, Ministry of Natural Resources and Environment, Bangkok 10900, Thailand
| | - Vichai Reutrakul
- Department
of Chemistry and Center of Excellence for Innovation in Chemistry
(PERCH-CIC), Faculty of Science, Mahidol
University, Rama VI Road, Bangkok 10400, Thailand
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2
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Abstract
We report the development of a chemoenzymatic approach toward fasamycin A, a halogenated naphthacenoid that exhibits activities against methicillin-resistant Staphylococcus aureus and vancomycin-resistant Enterococcus faecalis. The synthesis was accomplished in a convergent manner: two fragments were combined together in a Sammes annulation to afford a dimethylnaphthacenone system. Finally, an enzymatic halogenation was employed to introduce the requisite chlorine substituent of the natural product at a late stage.
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Affiliation(s)
- Jian Li
- The Scripps Research Institute, Department of Chemistry, 130 Scripps Way, Jupiter, Florida 33458 United States
| | - Hans Renata
- The Scripps Research Institute, Department of Chemistry, 130 Scripps Way, Jupiter, Florida 33458 United States
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3
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Cui J, Li S, Jia J. A regioselective synthesis of 7-methyl juglone and its derivatives. Nat Prod Res 2020; 36:18-25. [DOI: 10.1080/14786419.2020.1761356] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Jiahua Cui
- School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai, P.R. China
| | - Shaoshun Li
- School of Pharmacy, Shanghai Jiaotong University, Shanghai, P.R. China
| | - Jinping Jia
- School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai, P.R. China
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4
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Mechsner B, Böse D, Hogenkamp F, Ledermann N, Hartmann R, Bochinsky K, Frey W, Pietruszka J. Enantioselective total synthesis of altersolanol A and N. Bioorg Med Chem 2019; 27:2991-2997. [DOI: 10.1016/j.bmc.2019.04.033] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Accepted: 04/26/2019] [Indexed: 10/26/2022]
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5
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Heravi MM, Zadsirjan V, Saedi P, Momeni T. Applications of Friedel-Crafts reactions in total synthesis of natural products. RSC Adv 2018; 8:40061-40163. [PMID: 35558228 PMCID: PMC9091380 DOI: 10.1039/c8ra07325b] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Accepted: 11/03/2018] [Indexed: 12/17/2022] Open
Abstract
Over the years, Friedel-Crafts (FC) reactions have been acknowledged as the most useful and powerful synthetic tools for the construction of a special kind of carbon-carbon bond involving an aromatic moiety. Its stoichiometric and, more recently, its catalytic procedures have extensively been studied. This reaction in recent years has frequently been used as a key step (steps) in the total synthesis of natural products and targeted complex bioactive molecules. In this review, we try to underscore the applications of intermolecular and intramolecular FC reactions in the total syntheses of natural products and complex molecules, exhibiting diverse biological properties.
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Affiliation(s)
- Majid M Heravi
- Department of Chemistry, School of Science, Alzahra University Vanak Tehran Iran +98 2188041344 +98 9121329147
| | - Vahideh Zadsirjan
- Department of Chemistry, School of Science, Alzahra University Vanak Tehran Iran +98 2188041344 +98 9121329147
| | - Pegah Saedi
- Department of Chemistry, School of Science, Alzahra University Vanak Tehran Iran +98 2188041344 +98 9121329147
| | - Tayebeh Momeni
- Department of Chemistry, School of Science, Alzahra University Vanak Tehran Iran +98 2188041344 +98 9121329147
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6
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Minami Y, Noguchi Y, Yamada M, Tsuruoka C, Furuya Y, Hiyama T. Synthesis of 1-Substituted 1,3-Dioxybuta-1,3-dienes by Palladium-catalyzed Addition of Methyl Ketones to an Aryl Silylethynyl Ether. CHEM LETT 2018. [DOI: 10.1246/cl.180582] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Yasunori Minami
- Research and Development Initiative, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan
| | - Yuta Noguchi
- Department of Applied Chemistry, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan
| | - Mayu Yamada
- Department of Applied Chemistry, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan
| | - Chisato Tsuruoka
- Department of Applied Chemistry, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan
| | - Yuki Furuya
- Department of Applied Chemistry, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan
| | - Tamejiro Hiyama
- Research and Development Initiative, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan
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7
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8
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Mechsner B, Henßen B, Pietruszka J. First enantioselective total synthesis of altersolanol A. Org Biomol Chem 2018; 16:7674-7681. [DOI: 10.1039/c8ob02113a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first enantioselective total synthesis of altersolanol A was accomplished by Diels–Alder cycloaddition promoted by (R)-3,3′-BINOL/boron Lewis acid.
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Affiliation(s)
- Bastian Mechsner
- Institut für Bioorganische Chemie (IBOC)
- Heinrich-Heine-Universität Düsseldorf im Forschungszentrum Jülich
- 52426 Jülich
- Germany
| | - Birgit Henßen
- Institut für Bioorganische Chemie (IBOC)
- Heinrich-Heine-Universität Düsseldorf im Forschungszentrum Jülich
- 52426 Jülich
- Germany
- IBG-1: Biotechnologie
| | - Jörg Pietruszka
- Institut für Bioorganische Chemie (IBOC)
- Heinrich-Heine-Universität Düsseldorf im Forschungszentrum Jülich
- 52426 Jülich
- Germany
- IBG-1: Biotechnologie
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9
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Maldonado-Domínguez M, Ruiz-Pérez K, González-Antonio O, Romero-Ávila M, Méndez-Stivalet J, Flores-Pérez B. On the Brassard's rule of regioselectivity in Diels–Alder reactions between haloquinones and polar dienes. RSC Adv 2016. [DOI: 10.1039/c6ra14073d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
DFT/MC/AIM computational methods and experimental tests were used to further explain the Brassard’s rule for the [4 + 2] polar Diels–Alder reaction between nucleophilic dienes and haloquinones, which proceeds with remarkably high regioselectivity.
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Affiliation(s)
- Mauricio Maldonado-Domínguez
- Facultad de Química
- Departamento de Química Orgánica
- Universidad Nacional Autónoma de México
- Ciudad Universitaria
- México
| | - Karen Ruiz-Pérez
- Facultad de Química
- Departamento de Química Orgánica
- Universidad Nacional Autónoma de México
- Ciudad Universitaria
- México
| | - Oscar González-Antonio
- Facultad de Química
- Departamento de Química Orgánica
- Universidad Nacional Autónoma de México
- Ciudad Universitaria
- México
| | - Margarita Romero-Ávila
- Facultad de Química
- Departamento de Química Orgánica
- Universidad Nacional Autónoma de México
- Ciudad Universitaria
- México
| | - José Méndez-Stivalet
- Facultad de Química
- Departamento de Química Orgánica
- Universidad Nacional Autónoma de México
- Ciudad Universitaria
- México
| | - Blas Flores-Pérez
- Facultad de Química
- Departamento de Química Orgánica
- Universidad Nacional Autónoma de México
- Ciudad Universitaria
- México
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10
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Yang H, Liu X, Li Q, Li L, Zhang JR, Tang Y. Total synthesis and preliminary SAR study of (±)-merochlorins A and B. Org Biomol Chem 2016; 14:198-205. [DOI: 10.1039/c5ob01946j] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A modular synthesis of merochlorins A and B, two naturally occurring antibiotics, has been achieved from the readily available building blocks in a highly concise manner.
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Affiliation(s)
- Hongzhi Yang
- The Comprehensive AIDS Research Center
- and Department of Pharmacology & Pharmaceutical Sciences
- School of Medicine
- Tsinghua University
- Beijing 100084
| | - Xue Liu
- Department of Basic Medical Sciences
- School of Medicine
- Tsinghua University
- Beijing 100084
- China
| | - Qingong Li
- The Comprehensive AIDS Research Center
- and Department of Pharmacology & Pharmaceutical Sciences
- School of Medicine
- Tsinghua University
- Beijing 100084
| | - Longbo Li
- The Comprehensive AIDS Research Center
- and Department of Pharmacology & Pharmaceutical Sciences
- School of Medicine
- Tsinghua University
- Beijing 100084
| | - Jing-Ren Zhang
- Department of Basic Medical Sciences
- School of Medicine
- Tsinghua University
- Beijing 100084
- China
| | - Yefeng Tang
- The Comprehensive AIDS Research Center
- and Department of Pharmacology & Pharmaceutical Sciences
- School of Medicine
- Tsinghua University
- Beijing 100084
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11
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Affiliation(s)
- Masao Morita
- Department of Chemistry, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Ken Ohmori
- Department of Chemistry, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Keisuke Suzuki
- Department of Chemistry, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8551, Japan
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12
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Jones KD, Rixson JE, Skelton BW, Gericke KM, Stewart SG. The Total Synthesis of Heraclemycin B through β-Ketosulfoxide and Aldehyde Annulation. ASIAN J ORG CHEM 2015. [DOI: 10.1002/ajoc.201500184] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Kieran D. Jones
- School of Chemistry and Biochemistry; The University of Western Australia (M310); 35 Stirling Highway Crawley WA 6009 (Australia)
| | - James E. Rixson
- School of Chemistry and Biochemistry; The University of Western Australia (M310); 35 Stirling Highway Crawley WA 6009 (Australia)
| | - Brian W. Skelton
- Centre for Microscopy, Characterisation and Analysis; The University of Western Australia; Crawley WA 6009 Australia
| | | | - Scott G. Stewart
- School of Chemistry and Biochemistry; The University of Western Australia (M310); 35 Stirling Highway Crawley WA 6009 (Australia)
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13
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Blunt CE, Torcuk C, Liu Y, Lewis W, Siegel D, Ross D, Moody CJ. Synthesis and Intracellular Redox Cycling of Natural Quinones and Their Analogues and Identification of Indoleamine-2,3-dioxygenase (IDO) as Potential Target for Anticancer Activity. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201503323] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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14
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Blunt CE, Torcuk C, Liu Y, Lewis W, Siegel D, Ross D, Moody CJ. Synthesis and Intracellular Redox Cycling of Natural Quinones and Their Analogues and Identification of Indoleamine-2,3-dioxygenase (IDO) as Potential Target for Anticancer Activity. Angew Chem Int Ed Engl 2015; 54:8740-5. [PMID: 26096359 DOI: 10.1002/anie.201503323] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2015] [Indexed: 11/10/2022]
Abstract
Natural quinones, often linked with cellular oxidation processes, exhibit pronounced biological activity. In particular, the structurally unique isothiazolonaphthoquinone aulosirazole, isolated from blue-green alga, possesses selective antitumor cytotoxicity, although its mechanism of action is unknown. The first synthesis of aulosirazole uses a route centered upon a late-stage regioselective Diels-Alder reaction. The structurally related natural product pronqodine A, an inhibitor of prostaglandin release, and analogues thereof, were also prepared for comparison. Biological evaluation of the compounds identified one potential target as the immunoregulatory enzyme indoleamine-2,3-dioxygenase (IDO). The isothiazoloquinones are also efficient substrates for the human quinone reductase NQO1, and undergo intracellular NQO1-dependent redox cycling resulting in the generation of reactive oxygen species, and at lower doses have the potential to alter the ratio of intracellular oxidized to reduced pyridine nucleotides.
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Affiliation(s)
- Christopher E Blunt
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD (UK)
| | - Canan Torcuk
- Department of Pharmaceutical Sciences, University of Colorado, Anschutz Medical Campus, 12850 East Montview Blvd., Aurora, CO 80045 (USA)
| | - Yang Liu
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD (UK)
| | - William Lewis
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD (UK)
| | - David Siegel
- Department of Pharmaceutical Sciences, University of Colorado, Anschutz Medical Campus, 12850 East Montview Blvd., Aurora, CO 80045 (USA)
| | - David Ross
- Department of Pharmaceutical Sciences, University of Colorado, Anschutz Medical Campus, 12850 East Montview Blvd., Aurora, CO 80045 (USA)
| | - Christopher J Moody
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD (UK).
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15
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Analysis of Antifungal Components in the Galls of Melaphis chinensisand Their Effects on Control of Anthracnose Disease of Chinese Cabbage Caused by Colletotrichum higginsianum. J CHEM-NY 2015. [DOI: 10.1155/2015/850103] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Fungal pathogens caused various diseases which resulted in heavy yield and quality losses on plants of commercial interests such as fruits, vegetables, and flowers. In our preliminary experimental results, the methanol extracts of four species of medicinal plantsMelaphis chinensis, Eugenia caryophyllata, Polygonum cuspidatum, andRheum officinalepossessed antifungal activity to causal agent of cabbage anthracnose,Colletotrichum higginsianum. Thus it was conducted to identify and quantify the chemical constituents in these herbs and to assess the antifungal effects of these compounds. Among the tested principles, the indicator compound methyl gallate fromM. chinensiswas the most effective one against the conidial germination. In addition, it exhibited significant effects of controlling anthracnose disease of Chinese cabbage caused byC. higginsianumPA-01 in growth chamber. These results indicate thatM. chinensismay be potential for further development of plant-derived pesticides for control of anthracnose of cabbage and other cruciferous crops.
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16
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Rojas-Flores C, Rios MY, López-Marure R, Olivo HF. Karwinaphthopyranones from the fruits of Karwinskia parvifolia and their cytotoxic activities. JOURNAL OF NATURAL PRODUCTS 2014; 77:2404-2409. [PMID: 25402632 DOI: 10.1021/np500430q] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The new 2-acetyl-8-methoxynaphthol (1) and five new "dimeric" napthopyranones, karwinaphthopyranones A1 and A2 (2 and 3) and karwinaphthopyranones B1-B3 (4-6), possessing a methoxy group at C-5', were isolated together with four other known compounds from the dried fruits of Karwinskia parvifolia. The structures of compounds 2-6 were determined by spectroscopic data interpretation. Cell culture assays showed that some of these compounds possess antiproliferative activities in representative human cancer cell lines, with half-maximal growth inhibitory concentrations in the micromolar range.
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Affiliation(s)
- Claudia Rojas-Flores
- Medicinal and Natural Products Chemistry, The University of Iowa , Iowa City, Iowa 52242, United States
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17
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Nicolaou KC, Hale CR, Nilewski C, Ioannidou HA, ElMarrouni A, Nilewski LG, Beabout K, Wang TT, Shamoo Y. Total synthesis of viridicatumtoxin B and analogues thereof: strategy evolution, structural revision, and biological evaluation. J Am Chem Soc 2014; 136:12137-60. [PMID: 25317739 PMCID: PMC4210137 DOI: 10.1021/ja506472u] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2014] [Indexed: 11/29/2022]
Abstract
The details of the total synthesis of viridicatumtoxin B (1) are described. Initial synthetic strategies toward this intriguing tetracycline antibiotic resulted in the development of key alkylation and Lewis acid-mediated spirocyclization reactions to form the hindered EF spirojunction, as well as Michael-Dieckmann reactions to set the A and C rings. The use of an aromatic A-ring substrate, however, was found to be unsuitable for the introduction of the requisite hydroxyl groups at carbons 4a and 12a. Applying these previous tactics, we developed stepwise approaches to oxidize carbons 12a and 4a based on enol- and enolate-based oxidations, respectively, the latter of which was accomplished after systematic investigations that revealed critical reactivity patterns. The herein described synthetic strategy resulted in the total synthesis of viridicatumtoxin B (1), which, in turn, formed the basis for the revision of its originally assigned structure. The developed chemistry facilitated the synthesis of a series of viridicatumtoxin analogues, which were evaluated against Gram-positive and Gram-negative bacterial strains, including drug-resistant pathogens, revealing the first structure-activity relationships within this structural type.
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Affiliation(s)
- K. C. Nicolaou
- Department of Chemistry, Department of Biochemistry
and Cell Biology, and Department of
Ecology and Evolutionary Biology, Rice University, 6100 Main Street, Houston, Texas 77005, United States
- Department
of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Christopher R.
H. Hale
- Department of Chemistry, Department of Biochemistry
and Cell Biology, and Department of
Ecology and Evolutionary Biology, Rice University, 6100 Main Street, Houston, Texas 77005, United States
- Department
of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Christian Nilewski
- Department of Chemistry, Department of Biochemistry
and Cell Biology, and Department of
Ecology and Evolutionary Biology, Rice University, 6100 Main Street, Houston, Texas 77005, United States
- Department
of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Heraklidia A. Ioannidou
- Department of Chemistry, Department of Biochemistry
and Cell Biology, and Department of
Ecology and Evolutionary Biology, Rice University, 6100 Main Street, Houston, Texas 77005, United States
- Department
of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Abdelatif ElMarrouni
- Department of Chemistry, Department of Biochemistry
and Cell Biology, and Department of
Ecology and Evolutionary Biology, Rice University, 6100 Main Street, Houston, Texas 77005, United States
- Department
of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Lizanne G. Nilewski
- Department of Chemistry, Department of Biochemistry
and Cell Biology, and Department of
Ecology and Evolutionary Biology, Rice University, 6100 Main Street, Houston, Texas 77005, United States
- Department
of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Kathryn Beabout
- Department of Chemistry, Department of Biochemistry
and Cell Biology, and Department of
Ecology and Evolutionary Biology, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Tim T. Wang
- Department of Chemistry, Department of Biochemistry
and Cell Biology, and Department of
Ecology and Evolutionary Biology, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Yousif Shamoo
- Department of Chemistry, Department of Biochemistry
and Cell Biology, and Department of
Ecology and Evolutionary Biology, Rice University, 6100 Main Street, Houston, Texas 77005, United States
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18
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Nawrat CC, Moody CJ. Quinones as Dienophiles in the Diels-Alder Reaction: History and Applications in Total Synthesis. Angew Chem Int Ed Engl 2014; 53:2056-77. [DOI: 10.1002/anie.201305908] [Citation(s) in RCA: 109] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2013] [Indexed: 01/24/2023]
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19
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Nawrat CC, Moody CJ. Chinone als Dienophile in der Diels-Alder-Reaktion - historische Entwicklung und Anwendungen in der Totalsynthese. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201305908] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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20
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Fuwa H, Muto T, Sekine K, Sasaki M. Total synthesis and structure revision of didemnaketal B. Chemistry 2014; 20:1848-60. [PMID: 24431266 DOI: 10.1002/chem.201303713] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2013] [Indexed: 11/07/2022]
Abstract
Didemnaketal B, a structurally complex spiroacetal that exhibits potent HIV-1 protease inhibitory activity, was originally discovered by Faulkner and his colleagues from the ascidian Didemnum sp. collected at Palau. Its absolute configuration was proposed on the basis of degradation/derivatization experiments of the authentic sample. However, our total synthesis of the proposed structure of didemnaketal B questioned the stereochemical assignment made by Faulkner et al. Here we describe in detail our first total synthesis of the proposed structure 2 of didemnaketal B, which features 1) a convergent synthesis of the C7-C21 spiroacetal domain by means of a strategy exploiting Suzuki-Miyaura coupling, 2) an Evans syn-aldol reaction and a vinylogous Mukaiyama aldol reaction for the assembly of the C1-C7 acyclic domain, and 3) a Nozaki-Hiyama-Kishi reaction for the construction of the C21-C28 side chain domain. The NMR spectroscopic discrepancies observed between synthetic 2 and the authentic sample as well as careful inspection of the Faulkner's stereochemical assignment led us to postulate that the absolute configuration of the C10-C20 domain of 2 has been erroneously assigned. Accordingly, the total synthesis of the revised structure 65 was achieved to show that the NMR spectroscopic properties of synthetic 65 were in good agreement with those of the authentic sample. Furthermore, application of the phenylglycine methyl ester (PGME) method to the C7-C21 spiroacetal domain enabled us to establish the absolute configuration of didemnaketal B.
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Affiliation(s)
- Haruhiko Fuwa
- Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577 (Japan), Fax: (+81) 22-217-6214.
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21
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Akrawi OA, Khan A, Patonay T, Villinger A, Langer P. Synthesis of arylated anthraquinones by site-selective Suzuki–Miyaura reactions of the bis(triflates) of 1,3-di(hydroxy)anthraquinones. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.08.041] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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22
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23
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Rixson JE, Skelton BW, Koutsantonis GA, Gericke KM, Stewart SG. Domino Reactions for the Synthesis of Anthrapyran-2-ones and the Total Synthesis of the Natural Product (±)-BE-26554A. Org Lett 2013; 15:4834-7. [DOI: 10.1021/ol402240v] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- James E. Rixson
- The School of Chemistry and Biochemistry, and Centre for Microscopy, Characterisation and Analysis, The University of Western Australia, Crawley, WA 6009, Australia, and Bayer Pharma AG, Medicinal Chemistry, 42096 Wuppertal, Germany
| | - Brian W. Skelton
- The School of Chemistry and Biochemistry, and Centre for Microscopy, Characterisation and Analysis, The University of Western Australia, Crawley, WA 6009, Australia, and Bayer Pharma AG, Medicinal Chemistry, 42096 Wuppertal, Germany
| | - George A. Koutsantonis
- The School of Chemistry and Biochemistry, and Centre for Microscopy, Characterisation and Analysis, The University of Western Australia, Crawley, WA 6009, Australia, and Bayer Pharma AG, Medicinal Chemistry, 42096 Wuppertal, Germany
| | - Kersten M. Gericke
- The School of Chemistry and Biochemistry, and Centre for Microscopy, Characterisation and Analysis, The University of Western Australia, Crawley, WA 6009, Australia, and Bayer Pharma AG, Medicinal Chemistry, 42096 Wuppertal, Germany
| | - Scott G. Stewart
- The School of Chemistry and Biochemistry, and Centre for Microscopy, Characterisation and Analysis, The University of Western Australia, Crawley, WA 6009, Australia, and Bayer Pharma AG, Medicinal Chemistry, 42096 Wuppertal, Germany
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24
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Fuwa H, Sekine K, Sasaki M. Total Synthesis of the Proposed Structure of Didemnaketal B. Org Lett 2013; 15:3970-3. [DOI: 10.1021/ol4017518] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Haruhiko Fuwa
- Gradutate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Kumiko Sekine
- Gradutate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Makoto Sasaki
- Gradutate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
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25
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Yamashita Y, Hirano Y, Takada A, Takikawa H, Suzuki K. Total Synthesis of the Antibiotic BE-43472B. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201301591] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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26
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Yamashita Y, Hirano Y, Takada A, Takikawa H, Suzuki K. Total Synthesis of the Antibiotic BE-43472B. Angew Chem Int Ed Engl 2013; 52:6658-61. [DOI: 10.1002/anie.201301591] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2013] [Revised: 04/13/2013] [Indexed: 11/06/2022]
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27
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Wang W, Xue J, Tian T, Zhang J, Wei L, Shao J, Xie Z, Li Y. Total synthesis of (±)-δ-rubromycin. Org Lett 2013; 15:2402-5. [PMID: 23635026 DOI: 10.1021/ol400864f] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Transition-metal-catalyzed spiroketalization cyclization has been performed successfully and has led to the first total synthesis of (±)-δ-rubromycin with a longest linear sequence of 18 steps from commercially available guaiacol in a 2.7% overall yield.
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Affiliation(s)
- Wenjing Wang
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University , Lanzhou 730000, Gansu, P. R. China
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28
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Podlesny EE, Kozlowski MC. Divergent approach to the bisanthraquinone natural products: total synthesis of (S)-bisoranjidiol and derivatives from binaphtho-para-quinones. J Org Chem 2013; 78:466-76. [PMID: 23249414 PMCID: PMC3560291 DOI: 10.1021/jo302364h] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The development of the first asymmetric synthesis of a chiral anthraquinone dimer is outlined, resulting in the first total synthesis of (S)-bisoranjidiol. Rather than a biomimetic dimerization retrosynthetic disconnection, the anthracenyl ring systems are generated after formation of the axially chiral binaphthalene framework. This synthetic strategy has enabled the synthesis of several analogues. Key features of the synthesis include the enantioselective coupling of a hindered 2-naphthol containing substitution peri to the site of C-C bond formation, the regioselective oxidation of 8,8'-hydroxylated binaphthols to binaphtho-para-quinones, and a tandem regioselective Diels-Alder/aromatization reaction.
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Affiliation(s)
- Erin E. Podlesny
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323
| | - Marisa C. Kozlowski
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323
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29
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Hussain H, Green IR, Krohn K, Ahmed I. Advances in the total synthesis of biologically important callipeltosides: a review. Nat Prod Rep 2013; 30:640-93. [DOI: 10.1039/c3np20110d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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30
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Sun RR, Miao FP, Zhang J, Wang G, Yin XL, Ji NY. Three new xanthone derivatives from an algicolous isolate of Aspergillus wentii. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2013; 51:65-68. [PMID: 23172582 DOI: 10.1002/mrc.3903] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2012] [Revised: 10/25/2012] [Accepted: 11/06/2012] [Indexed: 06/01/2023]
Abstract
Three new xanthone derivatives, yicathin A (1), yicathin B (2), and yicathin C (3), and three known anthraquinone derivatives, alatinone (4), 1,5-dihydroxy-3-methoxy-7-methylanthraquinone (5), and 5-hydroxy-1,3-dimethoxy-7-methylanthraquinone (6), were isolated from the cultures of Aspergillus wentii pt-1, an endophytic fungus isolated from the marine red alga Gymnogongrus flabelliformis. Their structures were unambiguously elucidated by NMR and mass spectroscopic methods as well as quantum chemical calculations. Compound 2 was active against Escherichia coli, and 3 could inhibit E. coli, Staphylococcus aureus, and Colletotrichum lagenarium.
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31
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Quintiliano SA, Silva LF. Practical synthesis of a functionalized 1-oxo-1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.05.060] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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32
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Zaleski PA, Maini R, Leiris SJ, Elban MA, Hecht SM. Synthesis and biological activities of topopyrones. JOURNAL OF NATURAL PRODUCTS 2012; 75:577-585. [PMID: 22462811 DOI: 10.1021/np200777z] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Structure-activity studies were employed to investigate the stabilization of DNA-topoisomerases I and II covalent binary complexes by topopyrone analogues. The synthesis of five new topopyrone derivatives and study of their ability to stabilize DNA-topoisomerase I and DNA-topoisomerase II covalent binary complexes are described. The biochemical assays suggest that the orientation of the fused 1,4-pyrone ring and halogen substituents contribute importantly to the overall potency of the topopyrones as topoisomerase poisons.
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Affiliation(s)
- Paul A Zaleski
- Center for BioEnergetics, Biodesign Institute, Arizona State University, Tempe, Arizona 85287-6301, USA
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33
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Olmos A, Louis B, Pale P. Scandium(III)‐Zeolites as New Heterogeneous Catalysts for Imino‐Diels–Alder Reactions. Chemistry 2012; 18:4894-901. [DOI: 10.1002/chem.201103624] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2011] [Indexed: 12/22/2022]
Affiliation(s)
- Andrea Olmos
- Institute of Chemistry, UMR 7177, Université de Strasbourg, 4 rue B. Pascal, 67000 Strasbourg (France)
| | - Benoit Louis
- Institute of Chemistry, UMR 7177, Université de Strasbourg, 4 rue B. Pascal, 67000 Strasbourg (France)
| | - Patrick Pale
- Institute of Chemistry, UMR 7177, Université de Strasbourg, 4 rue B. Pascal, 67000 Strasbourg (France)
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34
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Affiliation(s)
- Christopher C. Nawrat
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - Christopher J. Moody
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
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35
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Podlesny EE, Kozlowski MC. Enantioselective total synthesis of (S)-bisoranjidiol, an axially chiral bisanthraquinone. Org Lett 2012; 14:1408-11. [PMID: 22360604 DOI: 10.1021/ol3001365] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The first enantioselective total synthesis of the bisanthraquinone (S)-bisoranjidiol and an unnatural regioisomer has been accomplished. Key features of the synthesis include the asymmetric oxidative biaryl coupling of a hindered 8-substituted 2-naphthol, selective para-quinone formation, and regioselective tandem Diels-Alder/aromatization reactions.
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Affiliation(s)
- Erin E Podlesny
- Department of Chemistry, Roy and Diana Vagelos Laboratories, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
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36
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O'Keefe BM, Mans DM, Kaelin DE, Martin SF. Studies Toward the Syntheses of Pluramycin Natural Products. The First Total Synthesis of Isokidamycin. Tetrahedron 2011; 67:6524-6538. [PMID: 21804649 PMCID: PMC3145363 DOI: 10.1016/j.tet.2011.05.117] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
We report the first total synthesis of the complex C-aryl glycoside isokidamycin, the epimer of the naturally-occurring pluramycin antibiotic kidamycin. The synthesis features a highly efficientDiels-Alder reaction between a substituted naphthyne and a glycosylatedfuran to form the anthracene core bearing a pendant angolosamine C-glycoside. The regiochemical outcome of the Diels-Alder reaction was controlled by employing a disposable silicon-tether to link the reactive napthyne and the glycosyl furan, rendering the cycloaddition intramolecular. The benzopyranone moietyof the aromatic nucleus was appended by cyclization of a functionalized vinylogous amide onto an advanced anthrol intermediate. The vancosamine amino glycoside was introduced by an O→C-glycoside rearrangement that produced the β-anomer. Subsequent refunctionalizations then led to isokidamycin.
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Affiliation(s)
- B Michael O'Keefe
- Department of Chemistry and Biochemistry The University of Texas at Austin, 1 University Station A5300 Austin, TX 78712-0165
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37
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Padwal J, Lewis W, Moody CJ. Synthesis of the reported structure of crassiflorone, a naturally occurring quinone isolated from the African ebony Diospyros crassiflora, and regioisomeric pentacyclic furocoumarin naphthoquinones. Org Biomol Chem 2011; 9:3484-93. [DOI: 10.1039/c0ob01231a] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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38
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Abid OUR, Nawaz M, Ibad MF, Khera RA, Iaroshenko V, Langer P. Synthesis of functionalized arylpyridines and -pyrimidines by domino [4+2]/retro [4+2] cycloadditions of electron-rich dienes with alkynylpyridines and -pyrimidines. Org Biomol Chem 2011; 9:2185-91. [DOI: 10.1039/c0ob00755b] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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39
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Paterson I, Paquet T. Total Synthesis and Configurational Validation of (+)-Phorbaside A. Org Lett 2010; 12:2158-61. [DOI: 10.1021/ol100693c] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ian Paterson
- University Chemical Laboratory, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Tanya Paquet
- University Chemical Laboratory, Lensfield Road, Cambridge CB2 1EW, U.K
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40
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Shukla N, Kumar M, Akanksha, Ahmad G, Rahuja N, Singh AB, Srivastava AK, Rajendran SM, Maurya R. Tectone, a New Antihyperglycemic Anthraquinone from Tectona grandis Leaves. Nat Prod Commun 2010. [DOI: 10.1177/1934578x1000500318] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
A new anthraquinone (3,8-dihydroxy-2-methyl anthraquinone), named tectone (1), along with fourteen known compounds (2-15) comprised of five terpenoids (2-5, 15), four flavonoids (6-9), three flavone glycosides (10-12), and two phenolic glycosides (13-14) were isolated from the chloroform and n-butanol fractions of the ethanol extract of Tectona grandis leaves. Attempts were made to synthesize compound 1. This resulted in the synthesis of three additional anthraquinones (16-18), out of which compound 16 is new. The structures of all compounds were established by spectral analysis. The isolated and synthesized compounds were evaluated for their antihyperglycemic activity. Compounds 1, 2, 4 and 14 showed significant antihyperglycemic activity in streptozotocin-induced diabetic rats at a dose of 100 mg/kg body weight, which is comparable to the standard drug metformin.
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Affiliation(s)
- Nivedita Shukla
- Medicinal and Process Chemistry Division, Central Drug Research Institute, CSIR, Lucknow 226 001, India
| | - Manmeet Kumar
- Medicinal and Process Chemistry Division, Central Drug Research Institute, CSIR, Lucknow 226 001, India
| | - Akanksha
- Medicinal and Process Chemistry Division, Central Drug Research Institute, CSIR, Lucknow 226 001, India
| | - Ghufran Ahmad
- Medicinal and Process Chemistry Division, Central Drug Research Institute, CSIR, Lucknow 226 001, India
| | - Neha Rahuja
- Division of Biochemistry, Central Drug Research Institute, CSIR, Lucknow 226 001, India
| | - Amar B. Singh
- Division of Biochemistry, Central Drug Research Institute, CSIR, Lucknow 226 001, India
| | - Arvind K. Srivastava
- Division of Biochemistry, Central Drug Research Institute, CSIR, Lucknow 226 001, India
| | - Siron M. Rajendran
- Division of Botany, Central Drug Research Institute, CSIR, Lucknow 226 001, India
| | - Rakesh Maurya
- Medicinal and Process Chemistry Division, Central Drug Research Institute, CSIR, Lucknow 226 001, India
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41
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Ee GCL, Wen YP, Sukari MA, Go R, Lee HL. A new anthraquinone from Morinda citrifolia roots. Nat Prod Res 2009; 23:1322-9. [PMID: 19735047 DOI: 10.1080/14786410902753138] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
An investigation of Morinda citrifolia roots afforded a new anthraquinone, 2-ethoxy-1-hydroxyanthraquinone (1), along with five other known anthraquinones: 1-hydroxy-2-methylanthraquinone (2), damnacanthal (3), nordamnacanthal (4), 2-formyl-1-hydroxyanthraquinone (5) and morindone-6-methyl-ether (6). This is the first report on the isolation of morindone-6-methyl-ether (6) from this plant. The structures of these compounds were elucidated based on spectroscopic analyses such as NMR, MS and IR. Biological evaluation of five pure compounds and all the extracts against the larvae of Aedes aegypti indicated 1-hydroxy-2-methylanthraquinone (2) and damnacanthal (3) were the extracts to exhibit promising larvicidal activities.
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Affiliation(s)
- G C L Ee
- Department of Chemistry, Faculty of Science, University Putra Malaysia, 43400 Serdang, Selangor, Malaysia.
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42
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Fu TH, Bonaparte A, Martin SF. Synthesis of β-Heteroaryl Propionates via Trapping of Carbocations with π-Nucleophiles. Tetrahedron Lett 2009; 50:3253-3257. [PMID: 20161309 PMCID: PMC2699308 DOI: 10.1016/j.tetlet.2009.02.018] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A variety of heterocyclic alcohols and acetates were coupled with silyl ketene acetals and other π-nucleophiles in the presence of trimethylsilyl trifluoromethanesulfonate to provide an array of substituted β-heteroaryl propionates, including those with contiguous quaternary centers, as well as vinylogs thereof. This reaction also proceeds with high diastereoselectivity when the π-nucleophile bears a chiral auxiliary.
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Affiliation(s)
- Tsung-hao Fu
- Department of Chemistry and Biochemistry, The University of Texas, Austin, TX USA 78712
| | - Amy Bonaparte
- Department of Chemistry and Biochemistry, The University of Texas, Austin, TX USA 78712
| | - Stephen F. Martin
- Department of Chemistry and Biochemistry, The University of Texas, Austin, TX USA 78712
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43
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Takikawa H, Hikita K, Suzuki K. Isoxazole-assisted direct substitution of the hydroxy group in alpha-ketols: introduction of angular substituents in a polycyclic system. Angew Chem Int Ed Engl 2008; 47:9887-90. [PMID: 19012304 DOI: 10.1002/anie.200801577] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Hiroshi Takikawa
- Department of Chemistry, Tokyo Institute of Technology, SORST-JST Agency, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8551, Japan
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44
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Takikawa H, Hikita K, Suzuki K. Isoxazole-Assisted Direct Substitution of the Hydroxy Group in α-Ketols: Introduction of Angular Substituents in a Polycyclic System. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200801577] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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45
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Troast DM, Yuan J, Porco JA. Studies Toward the Synthesis of (-)-Zampanolide: Preparation of the Macrocyclic Core. Adv Synth Catal 2008; 350:1701-1711. [PMID: 23543877 PMCID: PMC3612024 DOI: 10.1002/adsc.200800247] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Studies towards the synthesis of the macrocyclic core of (-)-zampanolide are reported. The synthetic approach features a one-pot reduction/vinylogous aldol reaction for construction of the C15-C20 fragment, an intramolecular silyl-modified Sakurai (ISMS) reaction for construction of the 2,6-cis-disubstituted exo-methylene pyran subunit, and use of an sp2-sp3 Stille reaction for macrocyclization.
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Affiliation(s)
- Dawn M. Troast
- Department of Chemistry, Center for Chemical Methodology and Library Development, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, USA
| | - Jiayi Yuan
- Department of Chemistry, Center for Chemical Methodology and Library Development, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, USA
| | - John A. Porco
- Department of Chemistry, Center for Chemical Methodology and Library Development, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, USA
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46
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Tan N, Cai XL, Wang SY, Pan JH, Tao YW, She ZG, Zhou SN, Lin YC, Vrijmoed LLP. A new hTopo I isomerase inhibitor produced by a mangrove endophytic fungus no. 2240. JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH 2008; 10:609-612. [PMID: 18636370 DOI: 10.1080/10286020802133167] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
A new hTopo I isomerase inhibitor, (+)-3,3',7,7',8,8'-hexahydroxy-5,5'-dimethylbianthraquinone (2240A), was isolated from the mangrove endophytic fungus no. 2240 collected from an estuarine mangrove at the South China Sea coast. Its structure was elucidated by spectral analyses including two-dimensional NMR, HR-EI-MS, IR, and UV. The hTopo I isomerase inhibition experiment showed that 2240A (1) possessed strong inhibiting activity. When its inhibition concentration was 4.65 micromol/l, its percent inhibition rate was 59.1%, while the lowest inhibition concentration of the positive control camptothecin was 1.00 x 10(3) micromol/l.
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Affiliation(s)
- Ni Tan
- School of Chemistry and Chemical Engineering, Zhongshan University, Guangzhou, China
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47
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Elban MA, Hecht SM. Total Synthesis of the Topopyrones: A New Class of Topoisomerase I Poisons. J Org Chem 2008; 73:785-93. [DOI: 10.1021/jo702487r] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Mark A. Elban
- Departments of Chemistry and Biology, University of Virginia, Charlottesville, Virginia 22904
| | - Sidney M. Hecht
- Departments of Chemistry and Biology, University of Virginia, Charlottesville, Virginia 22904
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48
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Ashburn BO, Carter RG. Diels–Alder approach to biaryls (DAB): Importance of the ortho-nitro moiety in the [4 + 2] cycloaddition. Org Biomol Chem 2008; 6:255-7. [DOI: 10.1039/b714893c] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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49
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El-Halawany AM, Chung MH, Nakamura N, Ma CM, Nishihara T, Hattori M. Estrogenic and anti-estrogenic activities of Cassia tora phenolic constituents. Chem Pharm Bull (Tokyo) 2007; 55:1476-82. [PMID: 17917292 DOI: 10.1248/cpb.55.1476] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Through an estrogenic activity bioassay-guided fractionation of the 70% ethanolic extract of Cassia tora seeds two new phenolic triglucosides, torachrysone 8-O-[beta-D-glucopyranosyl(1-->3)-O-beta-D-glucopyranosyl(1-->6)-O-beta-D-glucopyranoside] (1) and toralactone 9-O-[beta-D-glucopyranosyl-(1-->3)-O-beta-D-glucopyranosyl-(1-->6)-O-beta-D-glucopyranoside] (2), along with seven known compounds were isolated. The structures of the new compounds were elucidated on the basis of spectroscopic and chemical evidence. The estrogenic activity of the fractions and the isolated compounds were investigated using the estrogen-dependent proliferation of MCF-7 cells. In addition, the yeast two hybrid assay expressing estrogen receptor alpha (ERalpha) and beta (ERbeta) and the ERalpha competitor screening assay (ligand binding screen) were used to verify the binding affinities of the isolated compounds to ER. Furthermore, a naringinase pre-treatment of the 70% alcoholic extract of Cassia tora seeds resulted in a significant increase in its estrogenic activity. From the naringinase pre-treated extract six compounds were isolated, among which 6-hydroxymusizin and aurantio-obtusin showed the most potent estrogenic activity, while torachrysone, rubrofusarin and toralactone showed a significant anti-estrogenic activity. Finally, the structure requirements responsible for the estrogenic activity of the isolated compounds were studied by investigating the activity of several synthetic compounds and chemically modifying the isolated compounds. The basic nucleus 1,3,8-trihyroxynaphthalene (T(3)HN) was found to play a principal role in the binding affinity of these compounds to ER.
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50
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Tamiya M, Ohmori K, Kitamura M, Kato H, Arai T, Oorui M, Suzuki K. General Synthesis Route to Benanomicin-Pradimicin Antibiotics. Chemistry 2007; 13:9791-823. [PMID: 17907132 DOI: 10.1002/chem.200700863] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A general approach to the regio- and stereoselective total synthesis of the benanomicin-pradimicin antibiotics (BpAs) is described. Construction of the aglycon has been achieved by 1) the diastereoselective ring-opening of a biaryl lactone by using (R)-valinol as a chiral nucleophile and 2) the stereocontrolled semi-pinacol cyclization of the aldehyde acetal by using SmI(2) in the presence of BF(3)OEt(2) and a proton source to afford the ABCD tetracyclic monoprotected diol. This strategy enabled us to control the two stereogenic sites in the B ring (C-5 and C-6) and the regioselective introduction of the carbohydrate moiety. The ABCD tetracycle could serve as an ideal platform for the divergent access to various BpAs. The amino acid (D-alanine) was introduced onto the ABCD tetracycle. Glycosylation was promoted by the combination of Cp(2)HfCl(2) and AgOTf (1:2 ratio). Construction of the E ring followed by deprotection completed the first total synthesis of benanomicin A (2 a), benanomicin B (2 b), and pradimicin A (1 a). The route is flexible enough to allow the synthesis of other congeners differing in their amino acid and carbohydrate moieties.
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Affiliation(s)
- Minoru Tamiya
- Department of Chemistry, Tokyo Institute of Technology, SORST-JST, 2-12-1 O-okayama, Meguro-ku, Tokyo, Japan
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