1
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Woods JE, Jourdain RM, Romo D. Synthesis and Stability Studies of a Simplified, Thiazole-Containing Macrocycle of the Anticancer Agent Salarin C. Org Lett 2022; 24:6891-6896. [PMID: 35975906 PMCID: PMC9746118 DOI: 10.1021/acs.orglett.2c02326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
While salarin C (SalaC) is a potent marine cytotoxin, Kashman demonstrated that congeners which had undergone Wasserman rearrangement exhibit little to no cytotoxicity. Given that thiazoles are known to undergo Wasserman rearrangement at a significantly reduced rate, we hypothesized that a thiazole-containing SalaC would exhibit greater stability without significantly altering the macrocyclic conformation. Herein, we describe the synthesis of a simplified, thiazole-containing macrocycle which demonstrates significantly improved stability under identical aerobic conditions.
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2
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Okazaki S, Senda K, Tokuta A, Inagaki M, Kamaike K, Ota K, Miyaoka H. Biomimetic total synthesis of plakortone Q via acid-mediated tandem cyclization. Org Biomol Chem 2022; 20:6771-6775. [PMID: 35796262 DOI: 10.1039/d2ob01032a] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Plakortone Q and plakdiepoxide are natural polyketides isolated from the marine sponge Plakortis simplex. Bicyclo[3.3.0]furanolactone compounds, including plakortone Q, are expected to exhibit a wide range of pharmacological activities. Therefore, developing a simple and versatile synthetic method to produce these compounds is an important research goal. We have achieved the first total synthesis of plakortone Q and plakdiepoxide through an efficient protecting-group-free strategy. The key transformation was an acid-mediated tandem 5-endo-tet/5-endo-tet cyclization of vicinal diepoxide to build the tetrahydrofuran-γ-lactone motif.
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Affiliation(s)
- Shinnosuke Okazaki
- School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan.
| | - Kaho Senda
- School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan.
| | - Ayaka Tokuta
- School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan.
| | - Misa Inagaki
- School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan.
| | - Kazuo Kamaike
- School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan.
| | - Koichiro Ota
- School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan.
| | - Hiroaki Miyaoka
- School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan.
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3
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Bhat BA, Rashid S, Sengupta S, Mehta G. Recent Advances in Total Synthesis of Bioactive Furo[3,2‐
b
]furanone Natural Products. ASIAN J ORG CHEM 2020. [DOI: 10.1002/ajoc.201900714] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Bilal A. Bhat
- CSIR-Medicinal Chemistry DivisionIndian Institute of Integrative Medicine Sanatnagar-Srinagar 190005 India
- Academy of Scientific and Innovative Research India
| | - Showkat Rashid
- CSIR-Medicinal Chemistry DivisionIndian Institute of Integrative Medicine Sanatnagar-Srinagar 190005 India
- Academy of Scientific and Innovative Research India
| | | | - Goverdhan Mehta
- School of ChemistryUniversity of Hyderabad Hyderabad 500046 India
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4
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Foy NJ, Forbes KC, Crooke AM, Gruber MD, Cannon JS. Dual Lewis Acid/Photoredox-Catalyzed Addition of Ketyl Radicals to Vinylogous Carbonates in the Synthesis of 2,6-Dioxabicyclo[3.3.0]octan-3-ones. Org Lett 2018; 20:5727-5731. [PMID: 30188722 DOI: 10.1021/acs.orglett.8b02442] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A combined Lewis acid/photoredox catalyst system enabled the intramolecular umpolung addition of ketyl radicals to vinylogous carbonates in the synthesis of 2,6-dioxabicyclo[3.3.0]octan-3-ones. This reaction proceeded on a variety of aromatic ketones to provide THF rings in good yield (up to 95%). Although diastereoselectivity was found to be modest (1.4-5:1) for the C-C bond forming reaction, the minor diastereomers were converted to 2,6-dioxabicyclo[3.3.0]octan-3-ones by an efficient Lewis acid-mediated epimerization cascade in up to 90% yield.
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Affiliation(s)
- Nicholas J Foy
- Department of Chemistry , Occidental College , Los Angeles , California 90041 , United States
| | - Katherine C Forbes
- Department of Chemistry , Occidental College , Los Angeles , California 90041 , United States
| | - Anne Marie Crooke
- Department of Chemistry , Occidental College , Los Angeles , California 90041 , United States
| | - Maxwell D Gruber
- Department of Chemistry , Occidental College , Los Angeles , California 90041 , United States
| | - Jeffrey S Cannon
- Department of Chemistry , Occidental College , Los Angeles , California 90041 , United States
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5
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Li J, Li C, Riccio R, Lauro G, Bifulco G, Li TJ, Tang H, Zhuang CL, Ma H, Sun P, Zhang W. Chemistry and Selective Tumor Cell Growth Inhibitory Activity of Polyketides from the South China Sea Sponge Plakortis sp. Mar Drugs 2017; 15:md15050129. [PMID: 28467388 PMCID: PMC5450535 DOI: 10.3390/md15050129] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Revised: 04/17/2017] [Accepted: 04/28/2017] [Indexed: 12/25/2022] Open
Abstract
Simplextone E (1), a new metabolite of polyketide origin, was isolated with eight known analogues (2–9) from the South China Sea sponge Plakortis sp. The relative configuration of the new compound was elucidated by a detailed analysis of the spectroscopic data and quantum mechanical calculation of NMR chemical shifts, aided by the newly reported DP4+ approach. Its absolute configuration was determined by the TDDFT/ECD calculation. Simplextone E (1) is proven to be one of the isomers of simplextone D. The absolute configuration at C-8 in alkyl chain of plakortone Q (2) was also assigned based on the NMR calculation. In the preliminary in vitro bioassay, compounds 6 and 7 showed a selective growth inhibitory activity against HCT-116 human colon cancer cells with IC50 values of 8.3 ± 2.4 and 8.4 ± 2.3 μM, corresponding to that of the positive control, adriamycin (IC50 4.1 μM). The two compounds also showed selective activities towards MCF-7 human breast cancer and K562 human erythroleukemia cells while compound 3 only displayed weak activity against K562 cells.
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Affiliation(s)
- Jiao Li
- Research Center for Marine Drugs, School of Pharmacy, Second Military Medical University, 325 Guo-He Road, Shanghai 200433, China.
| | - Cui Li
- Research Center for Marine Drugs, School of Pharmacy, Second Military Medical University, 325 Guo-He Road, Shanghai 200433, China.
- Science and Research Laboratory, Longhua Hosptial, Shanghai University of Traditional Chinese Medicine, 725 South Wanping Road, Shanghai 200032, China.
| | - Raffaele Riccio
- Dipartimento di Farmacia, Universita' di Salerno, Via Giovanni Paolo II 132, 84084 Fisciano (SA), Italy.
| | - Gianluigi Lauro
- Dipartimento di Farmacia, Universita' di Salerno, Via Giovanni Paolo II 132, 84084 Fisciano (SA), Italy.
| | - Giuseppe Bifulco
- Dipartimento di Farmacia, Universita' di Salerno, Via Giovanni Paolo II 132, 84084 Fisciano (SA), Italy.
| | - Tie-Jun Li
- Research Center for Marine Drugs, School of Pharmacy, Second Military Medical University, 325 Guo-He Road, Shanghai 200433, China.
| | - Hua Tang
- Research Center for Marine Drugs, School of Pharmacy, Second Military Medical University, 325 Guo-He Road, Shanghai 200433, China.
| | - Chun-Lin Zhuang
- Research Center for Marine Drugs, School of Pharmacy, Second Military Medical University, 325 Guo-He Road, Shanghai 200433, China.
| | - Hao Ma
- Research Center for Marine Drugs, School of Pharmacy, Second Military Medical University, 325 Guo-He Road, Shanghai 200433, China.
| | - Peng Sun
- Research Center for Marine Drugs, School of Pharmacy, Second Military Medical University, 325 Guo-He Road, Shanghai 200433, China.
| | - Wen Zhang
- Research Center for Marine Drugs, School of Pharmacy, Second Military Medical University, 325 Guo-He Road, Shanghai 200433, China.
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6
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Li J, Lu L, Pan Q, Ren Y, Liu B, Yin B. Palladium-Catalyzed Dearomatizing Alkoxydiarylation of Furan Rings by Coupling with Arylboronic Acids: Access to Polysubstituted Oxabicyclic Compounds. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201601437] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Jiuyi Li
- Key Laboratory of Functional Molecular Engineering of Guangdong Province; School of Chemistry and Chemical Engineering; South China University of Technology; Guangzhou 510640 People's Republic of China, 510640
| | - Lin Lu
- Key Laboratory of Functional Molecular Engineering of Guangdong Province; School of Chemistry and Chemical Engineering; South China University of Technology; Guangzhou 510640 People's Republic of China, 510640
| | - Qi Pan
- The Second Affiliated Hospital of Guangzhou University of Chinese Medicine; Guangzhou People's Republic of China 510006
| | - Yanwei Ren
- Key Laboratory of Functional Molecular Engineering of Guangdong Province; School of Chemistry and Chemical Engineering; South China University of Technology; Guangzhou 510640 People's Republic of China, 510640
| | - Bo Liu
- The Second Affiliated Hospital of Guangzhou University of Chinese Medicine; Guangzhou People's Republic of China 510006
| | - Biaolin Yin
- Key Laboratory of Functional Molecular Engineering of Guangdong Province; School of Chemistry and Chemical Engineering; South China University of Technology; Guangzhou 510640 People's Republic of China, 510640
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7
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Carella A, Ramos Ferronatto G, Marotta E, Mazzanti A, Righi P, Paolucci C. Betti's base for crystallization-induced deracemization of substituted aldehydes: synthesis of enantiopure amorolfine and fenpropimorph. Org Biomol Chem 2017; 15:2968-2978. [PMID: 28294238 DOI: 10.1039/c6ob02765b] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The acid-promoted crystallization-induced diastereoisomer transformation (CIDT) of naphthoxazines derived from racemic O-protected 2-substituted 4-hydroxybutyraldehydes and enantiopure Betti's base allows the deracemization of the starting aldehydes with ee up to 96%. As an alternative, reduction with lithium aluminum hydride of the diastereoisomerically enriched naphthoxazines leads to enantioenriched primary amines. The utility of the latter strategy was demonstrated by applying it to the synthesis of enantioenriched fenpropimorph and to the first synthesis of enantiopure amorolfine, with ee up to 99.5%.
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Affiliation(s)
- Andrea Carella
- Dipartimento di Chimica Industriale "Toso Montanari" - Alma Mater Studiorum - Università di Bologna - Viale del Risorgimento, 4 - I-40136 Bologna, Italy
| | - Gabriel Ramos Ferronatto
- Dipartimento di Chimica Industriale "Toso Montanari" - Alma Mater Studiorum - Università di Bologna - Viale del Risorgimento, 4 - I-40136 Bologna, Italy
| | - Emanuela Marotta
- Dipartimento di Chimica Industriale "Toso Montanari" - Alma Mater Studiorum - Università di Bologna - Viale del Risorgimento, 4 - I-40136 Bologna, Italy
| | - Andrea Mazzanti
- Dipartimento di Chimica Industriale "Toso Montanari" - Alma Mater Studiorum - Università di Bologna - Viale del Risorgimento, 4 - I-40136 Bologna, Italy
| | - Paolo Righi
- Dipartimento di Chimica Industriale "Toso Montanari" - Alma Mater Studiorum - Università di Bologna - Viale del Risorgimento, 4 - I-40136 Bologna, Italy
| | - Claudio Paolucci
- Dipartimento di Chimica Industriale "Toso Montanari" - Alma Mater Studiorum - Università di Bologna - Viale del Risorgimento, 4 - I-40136 Bologna, Italy
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8
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Affiliation(s)
- Xin-Yue Shen
- Department
of Chemistry, and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China
| | - Xiao-Shui Peng
- Department
of Chemistry, and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China
- Shenzhen
Municipal Key Laboratory of Chemical Synthesis of Medicinal Organic
Molecules, Shenzhen Research Institute, The Chinese University of Hong Kong, No. 10, Second Yuexing Road, Shenzhen 518507, China
| | - Henry N. C. Wong
- Department
of Chemistry, and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China
- Shenzhen
Municipal Key Laboratory of Chemical Synthesis of Medicinal Organic
Molecules, Shenzhen Research Institute, The Chinese University of Hong Kong, No. 10, Second Yuexing Road, Shenzhen 518507, China
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9
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Norris MD, Perkins MV. Structural diversity and chemical synthesis of peroxide and peroxide-derived polyketide metabolites from marine sponges. Nat Prod Rep 2016; 33:861-80. [DOI: 10.1039/c5np00142k] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The structural elucidation, chemical synthesis and therapeutic potential of peroxide and peroxide-derived sponge metabolites, with special focus on their intriguing structural similarities and differences from a biogenetic perspective, are reviewed.
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Affiliation(s)
- Matthew D. Norris
- School of Chemical and Physical Sciences
- Flinders University
- Adelaide
- Australia
| | - Michael V. Perkins
- School of Chemical and Physical Sciences
- Flinders University
- Adelaide
- Australia
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10
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Peng XS, Ylagan RMP, Siu YM, Wong HNC. Synthesis and Application of [3.3.0]Furofuranone in Total Synthesis. Chem Asian J 2015; 10:2070-83. [DOI: 10.1002/asia.201500288] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Indexed: 11/11/2022]
Affiliation(s)
- Xiao-Shui Peng
- Department of Chemistry, State Key Laboratory of Synthetic Chemistry; Center of Novel Functional Molecules, and Institute of Molecular Functional Materials; The Chinese University of Hong Kong, Shatin, New Territories; Hong Kong SAR China), Fax: (+852) 26035315
- Shenzhen Center of Novel Functional Molecules, Shenzhen Research Institute, and Shenzhen Municipal Key Laboratory of Chemical Synthesis of Medicinal Organic Molecules; The Chinese University of Hong Kong; No.10, Second Yuexing Road Shenzhen 518507 China
| | - Ridge Michael P. Ylagan
- Department of Chemistry, State Key Laboratory of Synthetic Chemistry; Center of Novel Functional Molecules, and Institute of Molecular Functional Materials; The Chinese University of Hong Kong, Shatin, New Territories; Hong Kong SAR China), Fax: (+852) 26035315
| | - Yuk Ming Siu
- Department of Chemistry, State Key Laboratory of Synthetic Chemistry; Center of Novel Functional Molecules, and Institute of Molecular Functional Materials; The Chinese University of Hong Kong, Shatin, New Territories; Hong Kong SAR China), Fax: (+852) 26035315
| | - Henry N. C. Wong
- Department of Chemistry, State Key Laboratory of Synthetic Chemistry; Center of Novel Functional Molecules, and Institute of Molecular Functional Materials; The Chinese University of Hong Kong, Shatin, New Territories; Hong Kong SAR China), Fax: (+852) 26035315
- Shenzhen Center of Novel Functional Molecules, Shenzhen Research Institute, and Shenzhen Municipal Key Laboratory of Chemical Synthesis of Medicinal Organic Molecules; The Chinese University of Hong Kong; No.10, Second Yuexing Road Shenzhen 518507 China
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11
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Sugimura H, Sato S, Tokudome K, Yamada T. Stereoselective Formation of Tetrahydrofuran Rings via [3 + 2] Annulation: Total Synthesis of Plakortone L. Org Lett 2014; 16:3384-7. [DOI: 10.1021/ol501446w] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hideyuki Sugimura
- Department of Chemistry and
Biological Science, Aoyama Gakuin University, 5-10-1, Fuchinobe, Chuo-ku, Sagamihara-shi 252-5258, Japan
| | - Shougo Sato
- Department of Chemistry and
Biological Science, Aoyama Gakuin University, 5-10-1, Fuchinobe, Chuo-ku, Sagamihara-shi 252-5258, Japan
| | - Kensei Tokudome
- Department of Chemistry and
Biological Science, Aoyama Gakuin University, 5-10-1, Fuchinobe, Chuo-ku, Sagamihara-shi 252-5258, Japan
| | - Takeshi Yamada
- Department of Chemistry and
Biological Science, Aoyama Gakuin University, 5-10-1, Fuchinobe, Chuo-ku, Sagamihara-shi 252-5258, Japan
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12
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Martín-Gálvez F, García-Ruiz C, Sánchez-Ruiz A, Valeriote FA, Sarabia F. An array of bengamide E analogues modified at the terminal olefinic position: synthesis and antitumor properties. ChemMedChem 2013; 8:819-31. [PMID: 23512621 DOI: 10.1002/cmdc.201300033] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2013] [Indexed: 12/12/2022]
Abstract
Based on our previously described synthetic strategy for bengamide E, a natural product of marine origin with antitumor activity, a small library of analogues modified at the terminal olefinic position was generated with the objective of investigating the effect of structural modifications on antitumor properties. Biological evaluation of these analogues, consisting of IC50 determinations against various tumor cell lines, revealed important aspects with respect to the structural requirements of this olefinic position for activity. Interestingly, the analogue possessing a cyclopentyl group displayed greater potency than the parent bengamide E, representing a key finding upon which to base further investigations into the design of new analogues with promising biological activities.
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Affiliation(s)
- Francisca Martín-Gálvez
- Department of Organic Chemistry, Faculty of Sciences, University of Malaga, Campus de Teatinos s/n. 29071 Málaga, Spain
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13
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Liu XF, Shen Y, Yang F, Hamann MT, Jiao WH, Zhang HJ, Chen WS, Lin HW. Simplexolides A-E and plakorfuran A, six butyrate derived polyketides from the marine sponge Plakortis simplex. Tetrahedron 2012; 68:4635-4640. [PMID: 27867228 PMCID: PMC5114024 DOI: 10.1016/j.tet.2012.04.025] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Six new polyketides, simplexolides A-E (1-5) and a furan ester, plakorfuran A (6), together with four known furanylidenic methyl esters (7-10) were isolated from the marine sponge Plakortis simplex. Compounds 1-5 feature a tetrahydrofuran ring opened seco-plakortone skeleton. These new structures, including relative configurations, were determined on the basis of extensive analysis of spectroscopic data. The absolute configurations of 1-6 were established by the modified Mosher's method, and the CD exciton chirality method. However, configurations of the remote stereocenters at C-8 in compounds 1-5 were not determined. Antifungal, cytotoxicity, antileismanial, and antimalarial activities of these poly-ketides were evaluated.
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Affiliation(s)
- Xiang-Fang Liu
- Laboratory of Marine Drugs, Department of Pharmacy, Changzheng Hospital, Second Military Medical University, Shanghai 200003, People's Republic of China
- Department of Pharmacy, Shanghai Children's Hospital, Shanghai Jiao Tong University, 1400 West Beijing Road, Shanghai 200040, People's Republic of China
| | - Yang Shen
- Department of Pharmacy, Shanghai Children's Hospital, Shanghai Jiao Tong University, 1400 West Beijing Road, Shanghai 200040, People's Republic of China
| | - Fan Yang
- Laboratory of Marine Drugs, Department of Pharmacy, Changzheng Hospital, Second Military Medical University, Shanghai 200003, People's Republic of China
- Department of Pharmacognosy and the National Center for Natural Products Research (NCNPR), School of Pharmacy, The University of Mississippi, University, MS 38677, USA
| | - Mark T. Hamann
- Department of Pharmacognosy and the National Center for Natural Products Research (NCNPR), School of Pharmacy, The University of Mississippi, University, MS 38677, USA
| | - Wei-Hua Jiao
- Laboratory of Marine Drugs, Department of Pharmacy, Changzheng Hospital, Second Military Medical University, Shanghai 200003, People's Republic of China
| | - Hong-Jun Zhang
- Laboratory of Marine Drugs, Department of Pharmacy, Changzheng Hospital, Second Military Medical University, Shanghai 200003, People's Republic of China
| | - Wan-Sheng Chen
- Laboratory of Marine Drugs, Department of Pharmacy, Changzheng Hospital, Second Military Medical University, Shanghai 200003, People's Republic of China
| | - Hou-Wen Lin
- Laboratory of Marine Drugs, Department of Pharmacy, Changzheng Hospital, Second Military Medical University, Shanghai 200003, People's Republic of China
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14
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Jessen HJ, Schumacher A, Schmid F, Pfaltz A, Gademann K. Catalytic Enantioselective Total Synthesis of (+)-Torrubiellone C. Org Lett 2011; 13:4368-70. [DOI: 10.1021/ol201692h] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Henning J. Jessen
- University of Basel, Department of Chemistry, 4056 Basel, Switzerland
| | | | - Fabian Schmid
- University of Basel, Department of Chemistry, 4056 Basel, Switzerland
| | - Andreas Pfaltz
- University of Basel, Department of Chemistry, 4056 Basel, Switzerland
| | - Karl Gademann
- University of Basel, Department of Chemistry, 4056 Basel, Switzerland
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15
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Sun XY, Tian XY, Li ZW, Peng XS, Wong HNC. Total synthesis of plakortide E and biomimetic synthesis of plakortone B. Chemistry 2011; 17:5874-80. [PMID: 21491517 DOI: 10.1002/chem.201003309] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2010] [Indexed: 11/09/2022]
Abstract
The total synthesis of plakortide E (1a) is reported. A novel palladium-catalyzed approach towards 1,2-dioxolanes as well as an alternative substrate-controlled route leading exclusively to cis-highly substituted 1,2-dioxolanes have been developed. A lipase-catalyzed kinetic resolution was employed to provide optically pure 1,2-dioxolane central cores. Coupling of the central cores and side chains was achieved by a modified Negishi reaction. All four isomeric structures of plakortide E methyl ester, namely, 26a-d were synthesized. One of the structures, 26d, was shown to be identical with the natural plakortide E methyl ester on the basis of (1)H, (13)C NMR spectra and specific rotation comparisons. With the plakortide E methyl ester (4S,6R,10R)-(-)-cis-26d and its other three isomers in hand, we successfully converted them into (3S,4S,6R,10R)-plakortone B (2a), and its isomers ent-2a, 2b and ent-2b via an intramolecular oxa-Michael addition/lactonization cascade reaction. Finally, saponification converted 1,2-dioxolane 26d into plakortide E (1a) whose absolute configuration (4S,6R,10R) was confirmed by comparison of spectral and physical data with those reported.
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Affiliation(s)
- Xiao-Yu Sun
- Department of Chemistry, Centre of Novel Functional Molecules, Institute of Chinese Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, PR China
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16
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Silva, Jr. LF, Olofsson B. Hypervalent iodine reagents in the total synthesis of natural products. Nat Prod Rep 2011; 28:1722-54. [DOI: 10.1039/c1np00028d] [Citation(s) in RCA: 247] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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