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Hanif M, Zahoor AF, Saif MJ, Nazeer U, Ali KG, Parveen B, Mansha A, Chaudhry AR, Irfan A. Exploring the synthetic potential of epoxide ring opening reactions toward the synthesis of alkaloids and terpenoids: a review. RSC Adv 2024; 14:13100-13128. [PMID: 38655462 PMCID: PMC11036177 DOI: 10.1039/d4ra01834f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2024] [Accepted: 04/15/2024] [Indexed: 04/26/2024] Open
Abstract
Epoxides are oxygen containing heterocycles which are significantly employed as crucial intermediates in various organic transformations. They are considered highly reactive three-membered heterocycles due to ring strain and they undergo epoxide ring opening reactions with diverse range of nucleophiles. Epoxide ring-opening reactions have gained prominence as flexible and effective means to obtain various functionalized molecules. These reactions have garnered substantial attention in organic synthesis, driven by the need to comprehend the synthesis of biologically and structurally important organic compounds. They have also found applications in the synthesis of complex natural products. In this review article, we have summarized the implementation of epoxide ring opening reactions in the synthesis of alkaloids and terpenoids based natural products reported within the last decade (2014-2023).
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Affiliation(s)
- Madiha Hanif
- Department of Chemistry, Government College University Faisalabad 38000-Faisalabad Pakistan
| | - Ameer Fawad Zahoor
- Department of Chemistry, Government College University Faisalabad 38000-Faisalabad Pakistan
| | - Muhammad Jawwad Saif
- Department of Applied Chemistry, Government College University Faisalabad 38000-Faisalabad Pakistan
| | - Usman Nazeer
- Department of Chemistry, University of Houston 3585 Cullen Boulevard Texas 77204-5003 USA
| | - Kulsoom Ghulam Ali
- Department of Chemistry, Government College University Faisalabad 38000-Faisalabad Pakistan
| | - Bushra Parveen
- Department of Chemistry, Government College University Faisalabad 38000-Faisalabad Pakistan
| | - Asim Mansha
- Department of Chemistry, Government College University Faisalabad 38000-Faisalabad Pakistan
| | - Aijaz Rasool Chaudhry
- Department of Physics, College of Science, University of Bisha P.O. Box 551 Bisha 61922 Saudi Arabia
| | - Ahmad Irfan
- Department of Chemistry, King Khalid University P.O. Box 9004 Abha 61413 Saudi Arabia
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2
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Sun S, Wang X, Csuk R, Li S. Practical Synthesis and Antifungal Investigation of Drimane Meroterpenoids Enabled by Nickel-Catalyzed Decarboxylative Coupling. JOURNAL OF NATURAL PRODUCTS 2023; 86:1420-1427. [PMID: 37226456 DOI: 10.1021/acs.jnatprod.3c00100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Drimane meroterpenoids have drawn increasing attention in the discovery of novel pharmaceutical leads owing to their structural diversity and bioactivity variation, but further development is significantly impeded by the lack of an efficient modular route of preparation. A nickel-catalyzed decarboxylative cross-coupling paradigm has been established to expeditiously access a constellation of drimane meroterpenoids. The redox-active drimane precursor is a bench-stable coupling partner and is easily available from the inexpensive feedstock sclareol. This transformation features the tolerance of challenging functional groups (phenol, aldehyde, ester, etc.) and mild conditions with a low-cost nickel catalytic system. The synthetic utility is further highlighted by the direct scalable synthesis of challenging drimane meroterpenoids as diversifiable advanced intermediates for late-stage functionalizations. This method facilitated antifungal investigations and culminated in the discovery of compounds C8 and C3 as new antifungal leads against Rhizoctonia solani, with EC50 values of 4.9 and 7.2 μM, respectively.
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Affiliation(s)
- Shengxin Sun
- National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for R&D of Fine Chemicals of Guizhou University, Guiyang, 550025, China
| | - Xia Wang
- National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for R&D of Fine Chemicals of Guizhou University, Guiyang, 550025, China
- Department of Pesticide Science, College of Plant Protection, Nanjing Agricultural University, Weigang 1, Xuanwu District, Nanjing, 210095, China
| | - René Csuk
- Organic Chemistry, Martin-Luther-University Halle-Wittenberg, Kurt-Mothes-Straße 2, D-06120 Halle (Saale), Germany
| | - Shengkun Li
- National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for R&D of Fine Chemicals of Guizhou University, Guiyang, 550025, China
- Department of Pesticide Science, College of Plant Protection, Nanjing Agricultural University, Weigang 1, Xuanwu District, Nanjing, 210095, China
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Shen SM, Appendino G, Guo YW. Pitfalls in the structural elucidation of small molecules. A critical analysis of a decade of structural misassignments of marine natural products. Nat Prod Rep 2022; 39:1803-1832. [PMID: 35770685 DOI: 10.1039/d2np00023g] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Covering: July 2010 to August 2021This article summarizes more than 200 cases of misassigned marine natural products reported between July 2010 and August 2021, sorting out errors according to the structural elements. Based on a comparative analysis of the original and the revised structures, major pitfalls still plaguing the structural elucidation of small molecules were identified, emphasizing the role of total synthesis, crystallography, as well as chemical- and biosynthetic logic to complement spectroscopic data. Distinct "trends" in natural product misassignment are evident between compounds of marine and plant origin, with an overall much lower incidence of "impossible" structures within misassigned marine natural products.
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Affiliation(s)
- Shou-Mao Shen
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China. .,School of Chinese Materia Medica, Nanjing University of Chinese Medicine, Nanjing 210023, China
| | - Giovanni Appendino
- Dipartimento di Scienze del Farmaco, Universitá degli Studi del Piemonte Orientale, Largo Donegani 2, 28100 Novara, Italy
| | - Yue-Wei Guo
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China. .,Drug Discovery Shandong Laboratory, Bohai Rim Advanced Research Institute for Drug Discovery, Yantai, Shandong 264117, China
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Sassnink SA, Phan QD, Lam HC, Day AJ, Murray LAM, George JH. Biomimetic synthesis of the non-canonical PPAP natural products yezo'otogirin C and hypermogin D, and studies towards the synthesis of norascyronone A. Org Biomol Chem 2022; 20:1759-1768. [PMID: 35166295 DOI: 10.1039/d2ob00074a] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Oxidative degradation and rearrangement of polycyclic polyprenylated acylphloroglucinols (PPAPs) has created diverse families of unique natural products that are attractive targets for biomimetic synthesis. Herein, we report a racemic synthesis of hyperibrin A and its oxidative radical cyclization to give yezo'otogirin C, followed by epoxidation and House-Meinwald rearrangement to give hypermogin D. We also investigated the biomimetic synthesis of norascyronone A via a similar radical cyclization pathway, with unexpected results that give insight into its biosynthesis.
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Affiliation(s)
- Stefania A Sassnink
- Department of Chemistry, University of Adelaide, Adelaide, SA 5005, Australia.
| | - Quang D Phan
- Department of Chemistry, University of Adelaide, Adelaide, SA 5005, Australia.
| | - Hiu C Lam
- Department of Chemistry, University of Adelaide, Adelaide, SA 5005, Australia.
| | - Aaron J Day
- Department of Chemistry, University of Adelaide, Adelaide, SA 5005, Australia.
| | - Lauren A M Murray
- Department of Chemistry, University of Adelaide, Adelaide, SA 5005, Australia.
| | - Jonathan H George
- Department of Chemistry, University of Adelaide, Adelaide, SA 5005, Australia.
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George JH. Biomimetic Dearomatization Strategies in the Total Synthesis of Meroterpenoid Natural Products. Acc Chem Res 2021; 54:1843-1855. [PMID: 33793197 DOI: 10.1021/acs.accounts.1c00019] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Natural products are biosynthesized from a limited pool of starting materials via pathways that obey the same chemical logic as textbook organic reactions. Given the structure of a natural product, it is therefore often possible to predict its likely biosynthesis. Although biosynthesis mainly occurs in the highly specific chemical environments of enzymes, the field of biomimetic total synthesis attempts to replicate predisposed pathways using chemical reagents.We have followed several guidelines in our biomimetic approach to total synthesis. The overarching aim is to construct the same skeletal C-C and C-heteroatom bonds and in the same order as our biosynthetic hypothesis. In order to explore the innate reactivity of (bio)synthetic intermediates, the use of protecting groups is avoided or at least minimized. The key step, which is usually a cascade reaction, should be predisposed to selectively generate molecular complexity under substrate control (e.g., cycloadditions, radical cyclizations, carbocation rearrangements). In general, simple reagents and mild conditions are used; many of the total syntheses presented in this Account could be achieved using pre-1980s methodology. We have focused almost exclusively on the synthesis of meroterpenoids, that is, natural products of mixed terpene and aromatic polyketide origin, using commercially available terpenes and electron-rich aromatic compounds as starting materials. Finally, all of the syntheses in this Account involve a dearomatization step as a means to trigger a cascade reaction or to construct stereochemical complexity from a planar, aromatic intermediate.A biomimetic strategy can offer several advantages to a total synthesis project. Most obviously, successful biomimetic syntheses are usually concise and efficient, naturally adhering to the atom, step, and redox economies of synthesis. For example, in this Account, we describe a four-step synthesis of garcibracteatone and a three-step synthesis of nyingchinoid A. It is difficult to imagine shorter, non-biomimetic syntheses of these intricate molecules. Furthermore, biomimetic synthesis gives insight into biosynthesis by revealing the chemical relationships between biosynthetic intermediates. Access to these natural substrates allows collaboration with biochemists to help uncover the function of newly discovered enzymes and elucidate biosynthetic pathways, as demonstrated in our work on the napyradiomycin family. Third, by making biosynthetic connections between natural products, we can sometimes highlight incorrect structural assignments, and herein we discuss structure revisions of siphonodictyal B, rasumatranin D, and furoerioaustralasine. Last, biomimetic synthesis motivates the prediction of "undiscovered natural products" (i.e., missing links in biosynthesis), which inspired the isolation of prenylbruceol A and isobruceol.
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Affiliation(s)
- Jonathan H. George
- Department of Chemistry, The University of Adelaide, Adelaide, South Australia 5005, Australia
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Wong HNC, Peng XS, Zhong Z, Lyu MY, Ma HR. Pivotal Reactions in the Creation of the Polycyclic Skeleton of Cryptotrione. Synlett 2021. [DOI: 10.1055/a-1472-4594] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
AbstractThree pivotal reactions, namely, enyne cycloisomerization, polyene cyclization, and quinone methide formation, are applied to synthesize the complex polycyclic skeleton of cryptotrione. This review summarizes the most prominent applications of these three reactions to the total syntheses of natural products, covering results published in the literature between 2011 and 2020.1 Introduction2 Three Pivotal Reactions Applied to Create the Polycyclic Framework of Cryptotrione2.1 Enyne Cycloisomerization2.2 Polyene Cyclization2.3 Quinone Methide Formation3 Conclusion
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Affiliation(s)
- Henry N. C. Wong
- School of Science and Engineering, The Chinese University of Hong Kong (Shenzhen)
- Department of Chemistry, and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong
| | - Xiao-Shui Peng
- School of Science and Engineering, The Chinese University of Hong Kong (Shenzhen)
- Department of Chemistry, and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong
| | - Zhuliang Zhong
- Department of Chemistry, and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong
| | - Mao-Yun Lyu
- Department of Chemistry, and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong
| | - Hao-Ran Ma
- School of Science and Engineering, The Chinese University of Hong Kong (Shenzhen)
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7
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Vieira de Castro T, Yahiaoui O, Peralta RA, Fallon T, Lee V, George JH. Biomimetic Synthesis Enables the Structure Revision of Littordials E and F and Drychampone B. Org Lett 2020; 22:8161-8166. [DOI: 10.1021/acs.orglett.0c03156] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Oussama Yahiaoui
- Department of Chemistry, University of Adelaide, Adelaide, SA 5005, Australia
| | - Ricardo A. Peralta
- Department of Chemistry, University of Adelaide, Adelaide, SA 5005, Australia
| | - Thomas Fallon
- Department of Chemistry, University of Adelaide, Adelaide, SA 5005, Australia
| | - Victor Lee
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - Jonathan H. George
- Department of Chemistry, University of Adelaide, Adelaide, SA 5005, Australia
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8
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Tao E, Inoue M, Jeong T, Kim IS, Yoshimitsu T. Total Synthesis of (±)-Liphagal via Organic-Redox-Driven Palladium-Catalyzed Hydroxybenzofuran Formation. J Org Chem 2020; 85:9064-9070. [PMID: 32597646 DOI: 10.1021/acs.joc.0c00965] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A synthetic route to liphagal, a natural PI3Kα inhibitor isolated from Aka coralliphaga, was established. The present route features an organic redox process where an alkynylquinone undergoes reductive cyclization in the presence of a hydroquinone derivative such as hydroxyquinol (1,2,4-benzenetriol) and catalytic PdCl2 to provide a substituted benzofuran suitable for accessing the natural product. The benzofuran formation takes place via the redox transformation between the alkynylquinone and the electron-rich hydroquinones followed by the concomitant Pd(II)-catalyzed oxycyclization of the resultant alkynylhydroquinone.
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Affiliation(s)
- Eriko Tao
- Division of Pharmaceutical Sciences, Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
| | - Masaki Inoue
- Division of Pharmaceutical Sciences, Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
| | - Taejoo Jeong
- Division of Pharmaceutical Sciences, Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan.,School of Pharmacy, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - In Su Kim
- School of Pharmacy, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Takehiko Yoshimitsu
- Division of Pharmaceutical Sciences, Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
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Wang HL, Li R, Li J, He J, Cao ZY, Kurtán T, Mándi A, Zheng GL, Zhang W. Alternarin A, a Drimane Meroterpenoid, Suppresses Neuronal Excitability from the Coral-Associated Fungi Alternaria sp. ZH-15. Org Lett 2020; 22:2995-2998. [PMID: 32237750 DOI: 10.1021/acs.orglett.0c00746] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Alternarin A (1), a rearranged drimane meroterpenoid characterized by a thioglycerate moiety, was isolated together with two known analogues from the coral-associated fungi Alternaria sp. ZH-15. Its structure was determined based on spectroscopic analysis, modified Mosher's method, and TDDFT/ECD calculations. In a primary cultured cortical neuronal network, compound 1 effectively inhibited the activity of spontaneous synchronous Ca2+ oscillations and 4-aminopyridine induced epileptic discharges in the low micromolar concentration range.
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Affiliation(s)
- Hong-Liang Wang
- School of Pharmacy, Second Military Medical University, 325 Guo-He Road, Shanghai 200433, People's Republic of China.,NCO School of Army Medical University, 450 West Zhong-Shan Rd., Shijiazhuang 050000, People's Republic of China
| | - Ran Li
- School of Pharmacy, Second Military Medical University, 325 Guo-He Road, Shanghai 200433, People's Republic of China
| | - Jiao Li
- College of Pharmaceutical Science, Zhejiang Chinese Medical University, Gao-Ke Road, Hangzhou 311402, People's Republic of China
| | - Jing He
- State Key Laboratory of Natural Medicines and Department of TCM Pharmacology, School of Traditional Chinese Pharmacy, China Pharmaceutical University, 639 Long-Mian Avenue, Nanjing 211198, People's Republic of China
| | - Zheng-Yu Cao
- State Key Laboratory of Natural Medicines and Department of TCM Pharmacology, School of Traditional Chinese Pharmacy, China Pharmaceutical University, 639 Long-Mian Avenue, Nanjing 211198, People's Republic of China
| | - Tibor Kurtán
- Department of Organic Chemistry, University of Debrecen, POB 400, H-4002 Debrecen, Hungary
| | - Attila Mándi
- Department of Organic Chemistry, University of Debrecen, POB 400, H-4002 Debrecen, Hungary
| | - Gui-Liang Zheng
- Department of Otorhinolaryngology, Head and Neck Surgery, Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, 1665 Kong-Jiang Road, Shanghai 200092, People's Republic of China
| | - Wen Zhang
- School of Pharmacy, Second Military Medical University, 325 Guo-He Road, Shanghai 200433, People's Republic of China.,Tongji Hospital Affiliated to Tongji University, 389 Xin-Cun Road, Shanghai 200065, People's Republic of China
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10
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Wong THM, Li X, Ma D, Sun J. HNTf 2-Catalyzed Synthesis of Hydrodibenzofurans by an Epoxidation/Semipinacol Rearrangement Cascade. Org Lett 2020; 22:1951-1954. [PMID: 32091907 DOI: 10.1021/acs.orglett.0c00300] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Described here is a highly efficient synthesis of hydrodibenzofurans, an important structural unit lacking general access, in particular, with contiguous quaternary stereocenters. In the presence of HNTf2 as the superior catalyst and mCPBA as an oxidant, the readily available styrene substrates underwent a one-pot cascade process comprising epoxidation, semipinacol rearrangement, and hemiketal formation to furnish hydrodibenzofurans with good efficiency and diastereoselectivity.
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Affiliation(s)
- Ting Hei Matthew Wong
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
| | - Xingguang Li
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
| | - Dengke Ma
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
| | - Jianwei Sun
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
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11
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Gil JA, Arias F, Chahboun R, Alvarez-Manzaneda E. Synthesis of Cyclosiphonodictyol A and Its Bis(sulfato). J Org Chem 2020; 85:3799-3805. [DOI: 10.1021/acs.joc.9b03434] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Juan A. Gil
- Departamento de Quı́mica Orgánica, Facultad de Ciencias, Instituto de Biotecnologı́a, Universidad de Granada, 18071 Granada, Spain
| | - Fabio Arias
- Departamento de Quı́mica Orgánica, Facultad de Ciencias, Instituto de Biotecnologı́a, Universidad de Granada, 18071 Granada, Spain
| | - Rachid Chahboun
- Departamento de Quı́mica Orgánica, Facultad de Ciencias, Instituto de Biotecnologı́a, Universidad de Granada, 18071 Granada, Spain
| | - Enrique Alvarez-Manzaneda
- Departamento de Quı́mica Orgánica, Facultad de Ciencias, Instituto de Biotecnologı́a, Universidad de Granada, 18071 Granada, Spain
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12
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Purgett TJ, Dyer MW, Bickel B, McNeely J, Porco JA. Gold(I)-Mediated Cycloisomerization/Cycloaddition Enables Bioinspired Syntheses of Neonectrolides B-E and Analogues. J Am Chem Soc 2019; 141:15135-15144. [PMID: 31469554 DOI: 10.1021/jacs.9b06355] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Development of a synthetic route to the oxaphenalenone (OP) natural products neonectrolides B-E is described. The synthesis relies on gold-catalyzed 6-endo-dig hydroarylation of an unusual enynol substrate as well as a one-pot Rieche formylation/cyclization/deprotection sequence to efficiently construct the tricyclic oxaphenalenone framework in the form of a masked ortho-quinone methide (o-QM). A tandem cycloisomerization/[4 + 2] cycloaddition strategy was employed to quickly construct molecules resembling the neonectrolides. The tricyclic OP natural product SF226 could be converted to corymbiferan lactone E and a related masked o-QM. Our study culminates with the application of the tandem reaction sequence to syntheses of neonectrolides B-E as well as previously unreported exo-diastereomers.
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Affiliation(s)
- Thomas J Purgett
- Department of Chemistry, Center for Molecular Discovery (BU-CMD) , Boston University , 590 Commonwealth Avenue , Boston , Massachusetts 02215 , United States
| | - Matthew W Dyer
- Department of Chemistry, Center for Molecular Discovery (BU-CMD) , Boston University , 590 Commonwealth Avenue , Boston , Massachusetts 02215 , United States
| | - Bryce Bickel
- Department of Chemistry, Center for Molecular Discovery (BU-CMD) , Boston University , 590 Commonwealth Avenue , Boston , Massachusetts 02215 , United States
| | - James McNeely
- Department of Chemistry, Center for Molecular Discovery (BU-CMD) , Boston University , 590 Commonwealth Avenue , Boston , Massachusetts 02215 , United States
| | - John A Porco
- Department of Chemistry, Center for Molecular Discovery (BU-CMD) , Boston University , 590 Commonwealth Avenue , Boston , Massachusetts 02215 , United States
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13
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A Systematic Review of Recently Reported Marine Derived Natural Product Kinase Inhibitors. Mar Drugs 2019; 17:md17090493. [PMID: 31450856 PMCID: PMC6780990 DOI: 10.3390/md17090493] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Revised: 08/16/2019] [Accepted: 08/18/2019] [Indexed: 12/13/2022] Open
Abstract
Protein kinases are validated drug targets for a number of therapeutic areas, as kinase deregulation is known to play an essential role in many disease states. Many investigated protein kinase inhibitors are natural product small molecules or their derivatives. Many marine-derived natural products from various marine sources, such as bacteria and cyanobacteria, fungi, animals, algae, soft corals, sponges, etc. have been found to have potent kinase inhibitory activity, or desirable pharmacophores for further development. This review covers the new compounds reported from the beginning of 2014 through the middle of 2019 as having been isolated from marine organisms and having potential therapeutic applications due to kinase inhibitory and associated bioactivities. Moreover, some existing clinical drugs based on marine-derived natural product scaffolds are also discussed.
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14
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Kuan KK, Markwell-Heys AW, Cruickshank MC, Tran DP, Adlington RM, Baldwin JE, George JH. Biomimetic synthetic studies on meroterpenoids from the marine sponge Aka coralliphaga: Divergent total syntheses of siphonodictyal B, liphagal and corallidictyals A–D. Bioorg Med Chem 2019; 27:2449-2465. [DOI: 10.1016/j.bmc.2019.02.038] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Accepted: 02/18/2019] [Indexed: 10/27/2022]
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15
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Zhang S, Wang X, Hao J, Li D, Csuk R, Li S. Expediently Scalable Synthesis and Antifungal Exploration of (+)-Yahazunol and Related Meroterpenoids. JOURNAL OF NATURAL PRODUCTS 2018; 81:2010-2017. [PMID: 30207477 DOI: 10.1021/acs.jnatprod.8b00310] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The efficient synthesis and antifungal exploration of (+)-yahazunol and related natural products are described. Central to this strategy is the Barton decarboxylative coupling, comprising a one-pot radical decarboxylation and quinone addition cascade. The scalable synthesis of (+)-yahazunol was accomplished in five longest linear sequences (LLS) starting from commercially available and inexpensive (-)-sclareol. The divergent translational potential of (+)-yahazunol was demonstrated by the expedient preparation of (-)-zonarone, (-)-isozonarone, (-)-zonarol, (-)-isozonarol, (+)-chromazonarol, and (+)-yahazunone. This approach also enables the formal synthesis of puupehenol, puupehedione, and hongoquercin A. Antifungal evaluation was performed, and this represents the first biological profiles for (+)-yahazunone, (+)-8- O-acetylyahazunone, and (+)-8- O-acetylyahazunol. (+)-Chromazonarol and (+)-yahazunone are promising candidates against Sclerotinia scleotiorum, with EC50 values of 24.1 and 28.7 μM, respectively, demonstrating advantages over the original model (DM) and synthesized heterocyclic mimic (3a) of meroterpenoids. This will favor the establishment of a chemical repertoire in the management of different plant diseases.
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Affiliation(s)
- Shasha Zhang
- Department of Pesticide Science, College of Plant Protection , Nanjing Agricultural University , Weigang 1 , Xuanwu District, Nanjing 210095 , People's Republic of China
| | - Xia Wang
- Department of Pesticide Science, College of Plant Protection , Nanjing Agricultural University , Weigang 1 , Xuanwu District, Nanjing 210095 , People's Republic of China
| | - Jin Hao
- Department of Pesticide Science, College of Plant Protection , Nanjing Agricultural University , Weigang 1 , Xuanwu District, Nanjing 210095 , People's Republic of China
| | - Dangdang Li
- R & D Center , Jiangsu New Energy Crop Protection Co., Ltd. , 5 Xinmofan Road , Nanjing 210009 , People's Republic of China
| | - René Csuk
- Organic Chemistry , Martin-Luther-University Halle-Wittenberg , Kurt-Mothes-Straße 2 , D-06120 Halle (Saale) , Germany
| | - Shengkun Li
- Department of Pesticide Science, College of Plant Protection , Nanjing Agricultural University , Weigang 1 , Xuanwu District, Nanjing 210095 , People's Republic of China
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Jeedimalla N, Jacquet C, Bahneva D, Youte Tendoung JJ, Roche SP. Synthesis of α-Arylated Cycloalkanones from Congested Trisubstituted Spiro-epoxides: Application of the House–Meinwald Rearrangement for Ring Expansion. J Org Chem 2018; 83:12357-12373. [DOI: 10.1021/acs.joc.8b01448] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Nagalakshmi Jeedimalla
- Department of Chemistry and Biochemistry, Florida Atlantic University, Boca Raton, Florida 33431, United States
| | - Camille Jacquet
- Department of Chemistry and Biochemistry, Florida Atlantic University, Boca Raton, Florida 33431, United States
| | - Diana Bahneva
- Department of Chemistry and Biochemistry, Florida Atlantic University, Boca Raton, Florida 33431, United States
| | - Jean-Jacques Youte Tendoung
- Department of Chemistry and Biochemistry, Florida Atlantic University, Boca Raton, Florida 33431, United States
| | - Stéphane P. Roche
- Department of Chemistry and Biochemistry, Florida Atlantic University, Boca Raton, Florida 33431, United States
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17
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Colligs VC, Dialer C, Opatz T. Synthesis of Lamellarin G Trimethyl Ether by von Miller-Plöchl-Type Cyclocondensation. European J Org Chem 2018. [DOI: 10.1002/ejoc.201800611] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Vanessa C. Colligs
- Institute of Organic Chemistry; University of Mainz; Duesbergweg 10-14 55128 Mainz Germany
| | - Clemens Dialer
- Institute of Organic Chemistry; University of Mainz; Duesbergweg 10-14 55128 Mainz Germany
| | - Till Opatz
- Institute of Organic Chemistry; University of Mainz; Duesbergweg 10-14 55128 Mainz Germany
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18
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Wang JL, Li HJ, Wu YC. Divergent Synthesis of Marine Natural Products Siphonodictyal B, Corallidictyals C/D, and Liphagal Based on the Early Presence of an Aldehyde Group Instead of a Late-Stage Introduction. J Org Chem 2018; 83:8716-8723. [DOI: 10.1021/acs.joc.8b00989] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jun-Li Wang
- School of Marine Science and Technology, Harbin Institute of Technology, Weihai 264209, China
| | - Hui-Jing Li
- School of Marine Science and Technology, Harbin Institute of Technology, Weihai 264209, China
| | - Yan-Chao Wu
- School of Marine Science and Technology, Harbin Institute of Technology, Weihai 264209, China
- Beijing National Laboratory for Molecular Sciences, ICCAS, Beijing 100190, China
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19
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Zong Y, Wang W, Xu T. Total Synthesis of Bioactive Marine Meroterpenoids: The Cases of Liphagal and Frondosin B. Mar Drugs 2018; 16:md16040115. [PMID: 29614734 PMCID: PMC5923402 DOI: 10.3390/md16040115] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Revised: 03/28/2018] [Accepted: 03/28/2018] [Indexed: 01/09/2023] Open
Abstract
Liphagal and frondosin B are two marine-derived secondary metabolites sharing a very similar polyfused-benzofuran skeleton. The two tetracyclic meroterpenoids were isolated from marine sponges, both featuring a 6-5-7-6 fused ring system. A preliminary bioactive study shows that (+)-liphagal is a selective kinase (PI3K α) inhibitor, while (+)-frondosin B is shown to inhibit the binding of the cytokine interleukin-8 (IL-8) to its receptor, CX-CLR1/2. The unique structures and interesting biological profiles of these two meroterpenoids have attracted considerable attention from synthetic chemists. Herein we summarize the synthetic efforts with respect to (+)-liphagal and (+)-frondosin B during the past two decades.
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Affiliation(s)
- Yan Zong
- Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China.
| | - Weijia Wang
- Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China.
| | - Tao Xu
- Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China.
- Laboratory for Marine Drugs and Bioproducts of Qingdao, National Laboratory for Marine Science and Technology (QNLM), 1 Wenhai Road, Qingdao 266237, China.
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20
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Katoh T, Narita K. Total Syntheses of Liphagal: A Potent and Selective Phosphoinositide 3-Kinase α (PI3Kα) Inhibitor from the Marine Sponge Aka coralliphaga. HETEROCYCLES 2018. [DOI: 10.3987/rev-17-873] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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21
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Wang HS, Li HJ, Nan X, Luo YY, Wu YC. Enantiospecific Semisynthesis of Puupehedione-Type Marine Natural Products. J Org Chem 2017; 82:12914-12919. [DOI: 10.1021/acs.joc.7b02413] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hong-Shuang Wang
- School
of Marine Science and Technology, Harbin Institute of Technology, Weihai 264209, China
| | - Hui-Jing Li
- School
of Marine Science and Technology, Harbin Institute of Technology, Weihai 264209, China
| | - Xiang Nan
- School
of Marine Science and Technology, Harbin Institute of Technology, Weihai 264209, China
| | - Yuan-Yuan Luo
- School
of Marine Science and Technology, Harbin Institute of Technology, Weihai 264209, China
| | - Yan-Chao Wu
- School
of Marine Science and Technology, Harbin Institute of Technology, Weihai 264209, China
- Beijing
National Laboratory for Molecular Sciences, ICCAS, Beijing 100190, China
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22
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Tang MC, Cui X, He X, Ding Z, Zhu T, Tang Y, Li D. Late-Stage Terpene Cyclization by an Integral Membrane Cyclase in the Biosynthesis of Isoprenoid Epoxycyclohexenone Natural Products. Org Lett 2017; 19:5376-5379. [PMID: 28926261 DOI: 10.1021/acs.orglett.7b02653] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Macrophorins are representative examples of isoprenoid epoxycyclohexenones containing cyclized drimane moieties. We located and characterized the biosynthetic gene cluster of macrophorin from Penicillium terrestris. MacJ encoded by this cluster was characterized to be the first example of a membrane-bound type-II terpene cyclase catalyzing the cyclization of meroterpenoids via direct protonation of the terminal olefinic bond in acyclic yanuthones. The late-stage functionalization and substrate promiscuity of MacJ make it a potential biocatalyst for the synthesis of macrophorin analogues.
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Affiliation(s)
| | - Xiaoqing Cui
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China , Qingdao 266003, People's Republic of China
| | - Xueqian He
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China , Qingdao 266003, People's Republic of China
| | - Zhuang Ding
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China , Qingdao 266003, People's Republic of China
| | - Tianjiao Zhu
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China , Qingdao 266003, People's Republic of China
| | | | - Dehai Li
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China , Qingdao 266003, People's Republic of China.,Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology , Qingdao 266237, People's Republic of China
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23
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Wang JL, Li HJ, Wang HS, Wu YC. Regioselective 1,2-Diol Rearrangement by Controlling the Loading of BF 3·Et 2O and Its Application to the Synthesis of Related Nor-Sesquiterene- and Sesquiterene-Type Marine Natural Products. Org Lett 2017; 19:3811-3814. [PMID: 28696127 DOI: 10.1021/acs.orglett.7b01679] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The regiocontrolled rearrangement of 1,2-diols has been achieved by controlling the loading of BF3·Et2O. Its applicability is showcased by the divergent synthesis of austrodoral, austrodoric acid, and 8-epi-11-nordriman-9-one, as well as a formal synthesis of siphonodictyal B and liphagal. A new light is shed on piancol-type rearrangements that will be useful in diversity-oriented synthesis of related natural products.
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Affiliation(s)
- Jun-Li Wang
- School of Marine Science and Technology, Harbin Institute of Technology , Weihai 264209, China
| | - Hui-Jing Li
- School of Marine Science and Technology, Harbin Institute of Technology , Weihai 264209, China
| | - Hong-Shuang Wang
- School of Marine Science and Technology, Harbin Institute of Technology , Weihai 264209, China
| | - Yan-Chao Wu
- School of Marine Science and Technology, Harbin Institute of Technology , Weihai 264209, China.,Beijing National Laboratory for Molecular Sciences, ICCAS , Beijing 100190, China
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24
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Abstract
Covering: 2015. Previous review: Nat. Prod. Rep., 2016, 33, 382-431This review covers the literature published in 2015 for marine natural products (MNPs), with 1220 citations (792 for the period January to December 2015) referring to compounds isolated from marine microorganisms and phytoplankton, green, brown and red algae, sponges, cnidarians, bryozoans, molluscs, tunicates, echinoderms, mangroves and other intertidal plants and microorganisms. The emphasis is on new compounds (1340 in 429 papers for 2015), together with the relevant biological activities, source organisms and country of origin. Reviews, biosynthetic studies, first syntheses, and syntheses that lead to the revision of structures or stereochemistries, have been included.
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Affiliation(s)
- John W Blunt
- Department of Chemistry, University of Canterbury, Christchurch, New Zealand.
| | - Brent R Copp
- School of Chemical Sciences, University of Auckland, Auckland, New Zealand
| | - Robert A Keyzers
- Centre for Biodiscovery, School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington, New Zealand
| | - Murray H G Munro
- Department of Chemistry, University of Canterbury, Christchurch, New Zealand.
| | - Michèle R Prinsep
- Chemistry, School of Science, University of Waikato, Hamilton, New Zealand
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25
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Dethe DH, Dherange BD, Ali S, Parsutkar MM. Enantiospecific total syntheses of meroterpenoids (−)-F1839-I and (−)-corallidictyals B and D. Org Biomol Chem 2017; 15:65-68. [DOI: 10.1039/c6ob02322c] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Enantiospecific total syntheses of spiromeroterpenoid natural products (−)-F1839-I and (−)-corallidictyals B and D were achieved using the environmentally benign and highly atom economical Lewis acid catalysed Friedel–Crafts reaction and a highly regio- and stereoselective spirocyclic C–O bond formation reaction.
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Affiliation(s)
- Dattatraya H. Dethe
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur – 208016
- India
| | - Balu D. Dherange
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur – 208016
- India
| | - Saghir Ali
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur – 208016
- India
| | - Mahesh M. Parsutkar
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur – 208016
- India
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26
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Kikuchi T, Narita K, Saijo K, Ishioka C, Katoh T. Enantioselective Total Synthesis of (-)-Siphonodictyal B and (+)-8-epi-Siphonodictyal B with Phosphatidylinositol 3-Kinase α (PI3Kα) Inhibitory Activity. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600949] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Takuya Kikuchi
- Laboratory of Synthetic and Medicinal Chemistry; Faculty of Pharmaceutical Sciences; Tohoku Medical and Pharmaceutical University; 4-4-1 Komatsushima, Aoba-ku 981-8558 Sendai Japan
| | - Koichi Narita
- Laboratory of Synthetic and Medicinal Chemistry; Faculty of Pharmaceutical Sciences; Tohoku Medical and Pharmaceutical University; 4-4-1 Komatsushima, Aoba-ku 981-8558 Sendai Japan
| | - Ken Saijo
- Department of Clinical Oncology, Institute of Development, Aging and Cancer; Tohoku University; 4-1 Seiryomachi, Aoba-ku 980-8575 Sendai Japan
| | - Chikashi Ishioka
- Department of Clinical Oncology, Institute of Development, Aging and Cancer; Tohoku University; 4-1 Seiryomachi, Aoba-ku 980-8575 Sendai Japan
| | - Tadashi Katoh
- Laboratory of Synthetic and Medicinal Chemistry; Faculty of Pharmaceutical Sciences; Tohoku Medical and Pharmaceutical University; 4-4-1 Komatsushima, Aoba-ku 981-8558 Sendai Japan
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27
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Lam HC, Spence JTJ, George JH. Biomimetic Total Synthesis of Hyperjapones A–E and Hyperjaponols A and C. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201606091] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Hiu C. Lam
- Department of Chemistry University of Adelaide Adelaide SA 5005 Australia
| | | | - Jonathan H. George
- Department of Chemistry University of Adelaide Adelaide SA 5005 Australia
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28
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Lam HC, Spence JTJ, George JH. Biomimetic Total Synthesis of Hyperjapones A-E and Hyperjaponols A and C. Angew Chem Int Ed Engl 2016; 55:10368-71. [PMID: 27461748 DOI: 10.1002/anie.201606091] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Indexed: 11/08/2022]
Abstract
Hyperjapones A-E and hyperjaponols A-C are complex natural products of mixed aromatic polyketide and terpene biosynthetic origin that have recently been isolated from Hypericum japonicum. We have synthesized hyperjapones A-E using a biomimetic, oxidative hetero-Diels-Alder reaction to couple together dearomatized acylphloroglucinol and cyclic terpene natural products. Hyperjapone A is proposed to be the biosynthetic precursor of hyperjaponol C through a sequence of: 1) epoxidation; 2) acid-catalyzed epoxide ring-opening; and 3) a concerted, asynchronous alkene cyclization and 1,2-alkyl shift of a tertiary carbocation. Chemical mimicry of this proposed biosynthetic sequence allowed a concise total synthesis of hyperjaponol C to be completed in which six carbon-carbon bonds, six stereocenters, and three rings were constructed in just four steps.
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Affiliation(s)
- Hiu C Lam
- Department of Chemistry, University of Adelaide, Adelaide, SA, 5005, Australia
| | - Justin T J Spence
- Department of Chemistry, University of Adelaide, Adelaide, SA, 5005, Australia
| | - Jonathan H George
- Department of Chemistry, University of Adelaide, Adelaide, SA, 5005, Australia.
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29
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More AA, Ramana CV. Total Synthesis of Integrastatin B Enabled by a Benzofuran Oxidative Dearomatization Cascade. Org Lett 2016; 18:1458-61. [DOI: 10.1021/acs.orglett.6b00404] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Atul A. More
- Division of Organic Chemistry, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
| | - Chepuri V. Ramana
- Division of Organic Chemistry, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
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30
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More AA, Ramana CV. o-Quinone Methides via Oxone-Mediated Benzofuran Oxidative Dearomatization and Their Intramolecular Cycloaddition with Carbonyl Groups: An Expeditious Construction of the Central Tetracyclic Core of Integrastatins, Epicoccolide A, and Epicocconigrone A. Org Lett 2016; 18:612-5. [DOI: 10.1021/acs.orglett.5b03707] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Atul A. More
- Division of Organic Chemistry, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411 008, India
| | - Chepuri V. Ramana
- Division of Organic Chemistry, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411 008, India
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31
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Markwell-Heys AW, George JH. Some chemical speculation on the biosynthesis of corallidictyals A–D. Org Biomol Chem 2016; 14:5546-9. [DOI: 10.1039/c6ob00171h] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The efficient conversion of siphonodictyal B into the spirocyclic natural products corallidictyals A–D has been achieved via oxidative and acid catalyzed cyclizations.
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32
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Spence JTJ, George JH. Total Synthesis of Peniphenones A–D via Biomimetic Reactions of a Common o-Quinone Methide Intermediate. Org Lett 2015; 17:5970-3. [DOI: 10.1021/acs.orglett.5b02902] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Justin T. J. Spence
- Department of Chemistry, University of Adelaide, Adelaide, SA 5005, Australia
| | - Jonathan H. George
- Department of Chemistry, University of Adelaide, Adelaide, SA 5005, Australia
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