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Plangger I, Wurst K, Magauer T. Short, Divergent, and Enantioselective Total Synthesis of Bioactive ent-Pimaranes. Org Lett 2022; 24:7151-7156. [PMID: 36170466 PMCID: PMC7613685 DOI: 10.1021/acs.orglett.2c02843] [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] [Indexed: 11/29/2022]
Abstract
We present the first total synthesis of eight ent-pimaranes via a short and enantioselective route (11-16 steps). Key features of the divergent synthesis are a Sharpless asymmetric dihydroxylation, a Brønsted acid catalyzed cationic bicyclization, and a mild Rh-catalyzed arene hydrogenation for rapid access to a late synthetic branching point. From there on, selective functional group manipulations enable the synthesis of ent-pimaranes bearing different modifications in the A- and C-rings.
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Affiliation(s)
- Immanuel Plangger
- Institute of Organic Chemistry and Center for Molecular Biosciences, Leopold-Franzens-University Innsbruck, Innrain 80-82, 6020 Innsbruck, Austria
| | - Klaus Wurst
- Institute of General, Inorganic and Theoretical Chemistry, Leopold-Franzens-University Innsbruck, Innrain 80-82, 6020 Innsbruck, Austria
| | - Thomas Magauer
- Institute of Organic Chemistry and Center for Molecular Biosciences, Leopold-Franzens-University Innsbruck, Innrain 80-82, 6020 Innsbruck, Austria
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2
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Bahou KA, Braddock DC, Meyer AG, Savage GP, Shi Z, He T. A Relay Strategy Actuates Pre-Existing Trisubstituted Olefins in Monoterpenoids for Cross-Metathesis with Trisubstituted Alkenes. J Org Chem 2020; 85:4906-4917. [PMID: 32191466 PMCID: PMC7145354 DOI: 10.1021/acs.joc.0c00067] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A retrosynthetic disconnection-reconnection analysis of epoxypolyenes-substrates that can undergo cyclization to podocarpane-type tricycles-reveals relay-actuated Δ6,7-functionalized monoterpenoid alcohols for ruthenium benzylidene catalyzed olefin cross-metathesis with homoprenyl benzenes. Successful implementation of this approach provided several epoxypolyenes as expected (E/Z, ca. 2-3:1). The method is further generalized for the cross-metathesis of pre-existing trisubstituted olefins in other relay-actuated Δ6,7-functionalized monoterpenoid alcohols with various other trisubstituted alkenes to form new trisubstituted olefins. Epoxypolyene cyclization of an enantiomerically pure, but geometrically impure, epoxypolyene substrate provides an enantiomerically pure, trans-fused, podocarpane-type tricycle (from the E-geometrical isomer).
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Affiliation(s)
- Karim A Bahou
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, 80 Wood Lane, London W12 0BZ, U.K
| | - D Christopher Braddock
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, 80 Wood Lane, London W12 0BZ, U.K
| | - Adam G Meyer
- CSIRO Manufacturing, Jerry Price Laboratory, Research Way, Clayton 3168, Victoria, Australia
| | - G Paul Savage
- CSIRO Manufacturing, Jerry Price Laboratory, Research Way, Clayton 3168, Victoria, Australia
| | - Zhensheng Shi
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, 80 Wood Lane, London W12 0BZ, U.K
| | - Tianyou He
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, 80 Wood Lane, London W12 0BZ, U.K
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3
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Hu J, Jia Z, Xu K, Ding H. Total Syntheses of (+)-Stemarin and the Proposed Structures of Stemara-13(14)-en-18-ol and Stemara-13(14)-en-17-acetoxy-18-ol. Org Lett 2020; 22:1426-1430. [DOI: 10.1021/acs.orglett.0c00029] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jialei Hu
- Department of Chemistry, Zhejiang University, Hangzhou 310058, China
| | - Ziqi Jia
- Department of Chemistry, Zhejiang University, Hangzhou 310058, China
| | - Kaixiang Xu
- Department of Chemistry, Zhejiang University, Hangzhou 310058, China
| | - Hanfeng Ding
- Department of Chemistry, Zhejiang University, Hangzhou 310058, China
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou 311121, China
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Brandes MS, Gray NE. NRF2 as a Therapeutic Target in Neurodegenerative Diseases. ASN Neuro 2020; 12:1759091419899782. [PMID: 31964153 PMCID: PMC6977098 DOI: 10.1177/1759091419899782] [Citation(s) in RCA: 154] [Impact Index Per Article: 38.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2019] [Revised: 11/26/2019] [Accepted: 12/03/2019] [Indexed: 12/13/2022] Open
Abstract
Increased reactive oxygen species production and oxidative stress have been implicated in the pathogenesis of numerous neurodegenerative conditions including among others Alzheimer’s disease, Parkinson’s disease, Huntington’s disease, Friedrich’s ataxia, multiple sclerosis, and stroke. The endogenous antioxidant response pathway protects cells from oxidative stress by increasing the expression of cytoprotective enzymes and is regulated by the transcription factor nuclear factor erythroid 2-related factor 2 (NRF2). In addition to regulating the expression of antioxidant genes, NRF2 has also been shown to exert anti-inflammatory effects and modulate both mitochondrial function and biogenesis. This is because mitochondrial dysfunction and neuroinflammation are features of many neurodegenerative diseases as well NRF2 has emerged as a promising therapeutic target. Here, we review evidence for a beneficial role of NRF2 in neurodegenerative conditions and the potential of specific NRF2 activators as therapeutic agents.
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Affiliation(s)
- Mikah S. Brandes
- Department of Neurology, Oregon Health and Science University, Portland, OR, USA
| | - Nora E. Gray
- Department of Neurology, Oregon Health and Science University, Portland, OR, USA
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Shah PA, Wiemer DF. Synthesis of bavachromanol from resorcinol via a tandem cationic cascade/EAS sequence. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.02.041] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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Abstract
The first total synthesis of parvifloron F, a bioactive highly oxidized abietane diterpene, was achieved. The abietane skeleton was constructed by Lewis acid promoted cyclization. Preliminary structure-activity relationship correlations were established for the synthetic intermediates against human tumor cell lines. Certain compounds showed unique selective antiproliferative activity against triple-negative breast cancer. The oxidation level of the abietane ring affected the selectivity.
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Affiliation(s)
- Yohei Saito
- School of Pharmaceutical Sciences, College of Medical, Pharmaceutical and Health Science, Kanazawa University , Kanazawa, 920-1192, Japan
| | - Masuo Goto
- Chemical Biology and Medicinal Chemistry, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599-7568, United States
| | - Kyoko Nakagawa-Goto
- School of Pharmaceutical Sciences, College of Medical, Pharmaceutical and Health Science, Kanazawa University , Kanazawa, 920-1192, Japan.,Chemical Biology and Medicinal Chemistry, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599-7568, United States
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7
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Zhu G, Liu B. Synthesis of derivatives of podocarpane-type diterpenoids through Diels-Alder cycloaddition and photo-decarbonylation from unmasked ortho-benzoquinone. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.02.032] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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8
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Zhu G, Wadavrao SB, Liu B. Divergent Total Synthesis of Atisane-Type Diterpenoids. CHEM REC 2016; 17:584-596. [DOI: 10.1002/tcr.201600096] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2016] [Indexed: 02/04/2023]
Affiliation(s)
- Guili Zhu
- Key Laboratory of Green Chemistry & Technology of the Ministry of Education; College of Chemistry; Sichuan University; No. 29 Wangjiang Road, Chengdu Sichuan 610064 P. R. China
| | - Sachin B. Wadavrao
- Key Laboratory of Green Chemistry & Technology of the Ministry of Education; College of Chemistry; Sichuan University; No. 29 Wangjiang Road, Chengdu Sichuan 610064 P. R. China
| | - Bo Liu
- Key Laboratory of Green Chemistry & Technology of the Ministry of Education; College of Chemistry; Sichuan University; No. 29 Wangjiang Road, Chengdu Sichuan 610064 P. R. China
- State Key Laboratory of Natural Medicines; China Pharmaceutical University; No. 24 Tongjiaxiang, Nanjing Jiangsu 210009 P. R. China
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Song L, Zhu G, Liu Y, Liu B, Qin S. Total Synthesis of Atisane-Type Diterpenoids: Application of Diels–Alder Cycloadditions of Podocarpane-Type Unmasked ortho-Benzoquinones. J Am Chem Soc 2015; 137:13706-14. [DOI: 10.1021/jacs.5b08958] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Liqiang Song
- Key Laboratory of Green Chemistry & Technology of the Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China
| | - Guili Zhu
- Key Laboratory of Green Chemistry & Technology of the Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China
| | - Yongjiang Liu
- Key Laboratory of Green Chemistry & Technology of the Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China
| | - Bo Liu
- Key Laboratory of Green Chemistry & Technology of the Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China
- State
Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing 210009, China
| | - Song Qin
- Key Laboratory of Green Chemistry & Technology of the Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China
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Alizadeh A, Hosseini SY, Sedighian H, Bayat F. Synthesis of Phenanthrene Derivatives through the Reaction of anα,α-Dicyanoolefin withα,β-Unsaturated Carbonyl Compounds. Helv Chim Acta 2015. [DOI: 10.1002/hlca.201500120] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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11
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Huang R, Zhang X, Pan J, Li J, Shen H, Ling X, Xiong Y. Benzylation of arenes with benzyl halides synergistically promoted by in situ generated superacid boron trifluoride monohydrate and tetrahaloboric acid. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.01.037] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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12
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Li J, Liu Q, Shen H, Huang R, Zhang X, Xiong Y, Chen C. Ethers as hydrogen sources in BF3·OEt2 promoted reduction of diphenylmethyl alcohols, ethers and esters to hydrocarbons. RSC Adv 2015. [DOI: 10.1039/c5ra14775a] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
A novel ether/BF3 reductive system is effective for the reduction of diphenylmethanols and their ether and ester derivatives into hydrocarbons.
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Affiliation(s)
- Jiaqiang Li
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400044
- China
| | - Qing Liu
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400044
- China
| | - Hang Shen
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400044
- China
| | - Ruofeng Huang
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400044
- China
| | - Xiaohui Zhang
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400044
- China
| | - Yan Xiong
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400044
- China
- Chongqing Institute of Green and Intelligent Technology
| | - Changguo Chen
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400044
- China
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13
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Abstract
This review covers the isolation and chemistry of diterpenoids from terrestrial as opposed to marine sources and includes, labdanes, clerodanes, pimaranes, abietanes, kauranes, gibberellins, cembranes and their cyclization products. The literature from January to December, 2014 is reviewed.
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15
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Zhang S, Zhang X, Ling X, He C, Huang R, Pan J, Li J, Xiong Y. Superacid BF3–H2O promoted benzylation of arenes with benzyl alcohols and acetates initiated by trace water. RSC Adv 2014. [DOI: 10.1039/c4ra04059g] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
An efficient in situ prepared superacid BF3–H2O promoted benzylation of arenes using benzyl alcohols and acetates achieves various diarylalkanes.
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Affiliation(s)
- Shuting Zhang
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400030, China
| | - Xiaohui Zhang
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400030, China
| | - Xuege Ling
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400030, China
| | - Chao He
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400030, China
| | - Ruofeng Huang
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400030, China
| | - Jing Pan
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400030, China
| | - Jiaqiang Li
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400030, China
| | - Yan Xiong
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400030, China
- State Key Laboratory of Elemento-Organic Chemistry
- Nankai University
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