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Ji Y, Liu Y, Guan W, Guo C, Jia H, Hong B, Li H. Enantioselective Divergent Syntheses of Diterpenoid Pyrones. J Am Chem Soc 2024; 146:9395-9403. [PMID: 38497763 DOI: 10.1021/jacs.4c01788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/19/2024]
Abstract
Capitalizing a synergy between late-stage C(sp3)-H alkynylation and a series of transition metal-catalyzed alkyne functionalization reactions, we reported herein enantioselective divergent synthesis of 10 diterpenoid pyrones within 14-16 steps starting from chiral pool enoxolone, including the first enantioselective synthesis of higginsianins A, B, D, E, and metarhizin C. Our synthesis also highlights an unprecedented biomimetic oxidative rearrangement of α-pyrone into 3(2H)-furanone, as well as applications of Echavarren C(sp3)-H alkynylation reaction and Toste chiral counterion-mediated Au-catalyzed intramolecular allene hydroalkoxylation in natural product synthesis.
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Affiliation(s)
- Yunpeng Ji
- State Key Laboratory of Natural and Biomimetic Drugs, Chemical Biology Center, School of Pharmaceutical Sciences, Peking University, Xue Yuan Road No. 38, Beijing 100191, China
| | - Yaqian Liu
- State Key Laboratory of Natural and Biomimetic Drugs, Chemical Biology Center, School of Pharmaceutical Sciences, Peking University, Xue Yuan Road No. 38, Beijing 100191, China
| | - Weiqiang Guan
- State Key Laboratory of Natural and Biomimetic Drugs, Chemical Biology Center, School of Pharmaceutical Sciences, Peking University, Xue Yuan Road No. 38, Beijing 100191, China
| | - Chuning Guo
- State Key Laboratory of Natural and Biomimetic Drugs, Chemical Biology Center, School of Pharmaceutical Sciences, Peking University, Xue Yuan Road No. 38, Beijing 100191, China
| | - Hongli Jia
- State Key Laboratory of Natural and Biomimetic Drugs, Chemical Biology Center, School of Pharmaceutical Sciences, Peking University, Xue Yuan Road No. 38, Beijing 100191, China
| | - Benke Hong
- State Key Laboratory of Natural and Biomimetic Drugs, Chemical Biology Center, School of Pharmaceutical Sciences, Peking University, Xue Yuan Road No. 38, Beijing 100191, China
| | - Houhua Li
- State Key Laboratory of Natural and Biomimetic Drugs, Chemical Biology Center, School of Pharmaceutical Sciences, Peking University, Xue Yuan Road No. 38, Beijing 100191, China
- Ningbo Institute of Marine Medicine, Peking University, Ningbo 315010, China
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Regioselective functionalization of pyrones: Facile synthesis of 6-styrylpyrones via KHMDS-mediated aldol condensation. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2021.153574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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3
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Al-Khdhairawi AAQ, Low YY, Manshoor N, Arya A, Jelecki M, Alshawsh MA, Kamran S, Suliman RS, Low A, Shivanagere Nagojappa NB, Weber JFF. Asperginols A and B, Diterpene Pyrones, from an Aspergillus sp. and the Structure Revision of Previously Reported Analogues. JOURNAL OF NATURAL PRODUCTS 2020; 83:3564-3570. [PMID: 33305943 DOI: 10.1021/acs.jnatprod.0c00618] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Two new diterpene pyrones, asperginols A (1) and B (2), and four known analogues (3-6) were isolated from the endophytic fungus Aspergillus sp. HAB10R12. The structures and absolute configurations of these compounds were elucidated based on the analysis of their NMR, MS, and X-ray diffraction data. The revision of the absolute configurations at C-10, C-11, and C-14 of the known diterpene pyrones (3-6) and the determination of the configuration at the polyene side chain for compounds (4-6) were made using chemical methods and vibrational circular dichroism analysis. This group of diterpene pyrone compounds showed unique structural features including a 7/6/6 tricyclic diterpene moiety with an unusual trans-syn-trans stereochemical arrangement. Compound 6 showed moderate activity against the HT-29 colon cancer cell line.
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Affiliation(s)
- Amjad Ayad Qatran Al-Khdhairawi
- School of Pharmacy, Faculty of Health & Medical Sciences, Taylor's University Lakeside Campus, 47500 Subang Jaya, Selangor, Malaysia
| | - Yun-Yee Low
- Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Nurhuda Manshoor
- Atta-ur-Rahman Institute for Natural Product Discovery (AuRIns), Universiti Teknologi MARA (UiTM) Selangor Branch, 42300 Bandar Puncak Alam, Selangor, Malaysia
| | - Aditya Arya
- Department of Pharmacology and Therapeutics, School of Medicine, Faculty of Health and Medical Sciences, Taylor's University, 47500 Subang Jaya, Malaysia
- Department of Pharmacology and Therapeutics, Faculty of Medicine, Dentistry and Health Sciences, University of Melbourne, Parkville, VIC 3010, Australia
| | - Maciej Jelecki
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland
| | | | - Sareh Kamran
- Department of Pharmacology, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Rasha Saad Suliman
- College of Pharmacy, King Saud bin Abdulaziz University for Health Sciences Ministry of National Guard Health Affairs, 3177 Riyadh, Saudi Arabia
| | - Anis Low
- Atta-ur-Rahman Institute for Natural Product Discovery (AuRIns), Universiti Teknologi MARA (UiTM) Selangor Branch, 42300 Bandar Puncak Alam, Selangor, Malaysia
| | | | - Jean-Frédéric F Weber
- Atta-ur-Rahman Institute for Natural Product Discovery (AuRIns), Universiti Teknologi MARA (UiTM) Selangor Branch, 42300 Bandar Puncak Alam, Selangor, Malaysia
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Voltammetric pH Measurements Using Azure A-Containing Layer-by-Layer Film Immobilized Electrodes. Polymers (Basel) 2020; 12:polym12102328. [PMID: 33053708 PMCID: PMC7599638 DOI: 10.3390/polym12102328] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Revised: 10/02/2020] [Accepted: 10/07/2020] [Indexed: 01/05/2023] Open
Abstract
pH is one of the most important properties associated with an aqueous solution and various pH measurement techniques are available. In this study, Azure A-modified poly(methacrylic acid) (AA-PMA) was synthesized used to prepare a layer-by-layer deposited film with poly(allylamine hydrochloride) (PAH) on a glassy carbon electrode via electrostatic interactions and the multilayer film-immobilized electrode was used to measure pH. Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) measurement were performed. Consequently, the oxidation potential of AA on the electrode changed with pH. As per Nernst's equation, because H+ ions are involved in the redox reaction, the peak potential shifted depending on the pH of the solution. The peak potential shifts are easier to detect by DPV than CV measurement. Accordingly, using electrochemical responses, the pH was successfully measured in the pH range of 3 to 9, and the electrodes were usable for 50 repeated measurements. Moreover, these electrochemical responses were not affected by interfering substances.
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Heravi MM, Momeni T, Zadsirjan V, Mohammadi L. Application of The Dess-Martin Oxidation in Total Synthesis of Natural Products. Curr Org Synth 2020; 18:125-196. [PMID: 32940184 DOI: 10.2174/1570179417666200917102634] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2020] [Revised: 08/07/2020] [Accepted: 08/18/2020] [Indexed: 11/22/2022]
Abstract
Dess-Martin periodinane (DMP), a commercially available chemical, is frequently utilized as a mild oxidative agent for the selective oxidation of primary and secondary alcohols to their corresponding aldehydes and ketones, respectively. DMP shows several merits over other common oxidative agents such as chromiumand DMSO-based oxidants; thus, it is habitually employed in the total synthesis of natural products. In this review, we try to underscore the applications of DMP as an effective oxidant in an appropriate step (steps) in the multi-step total synthesis of natural products.
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Affiliation(s)
- Majid M Heravi
- Department of Chemistry, School of Science, Alzahra University, POBox 1993891176, Vanak, Tehran, Iran
| | - Tayebe Momeni
- Department of Chemistry, School of Science, Alzahra University, POBox 1993891176, Vanak, Tehran, Iran
| | - Vahideh Zadsirjan
- Department of Chemistry, School of Science, Alzahra University, POBox 1993891176, Vanak, Tehran, Iran
| | - Leila Mohammadi
- Department of Chemistry, School of Science, Alzahra University, POBox 1993891176, Vanak, Tehran, Iran
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6
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Synthetic biology based construction of biological activity-related library of fungal decalin-containing diterpenoid pyrones. Nat Commun 2020; 11:1830. [PMID: 32286350 PMCID: PMC7156458 DOI: 10.1038/s41467-020-15664-4] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Accepted: 03/19/2020] [Indexed: 12/12/2022] Open
Abstract
A synthetic biology method based on heterologous biosynthesis coupled with genome mining is a promising approach for increasing the opportunities to rationally access natural product with novel structures and biological activities through total biosynthesis and combinatorial biosynthesis. Here, we demonstrate the advantage of the synthetic biology method to explore biological activity-related chemical space through the comprehensive heterologous biosynthesis of fungal decalin-containing diterpenoid pyrones (DDPs). Genome mining reveals putative DDP biosynthetic gene clusters distributed in five fungal genera. In addition, we design extended DDP pathways by combinatorial biosynthesis. In total, ten DDP pathways, including five native pathways, four extended pathways and one shunt pathway, are heterologously reconstituted in a genetically tractable heterologous host, Aspergillus oryzae, resulting in the production of 22 DDPs, including 15 new analogues. We also demonstrate the advantage of expanding the diversity of DDPs to probe various bioactive molecules through a wide range of biological evaluations. Combining genome mining and heterologous expression in a genetically tractable host can lead to bioactive natural products discovery and production. Here, the authors employ this strategy for new decalin-containing diterpenoid pyrenes production by expressing native, extended, and shunt pathways in Aspergillus oryzae.
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Leonelli F, Piergentili I, Lucarelli G, Migneco LM, Marini Bettolo R. Unexpected Racemization in the Course of the Acetalization of (+)-(S)-5-Methyl-Wieland–Miescher Ketone with 1,2-Ethanediol and TsOH under Classical Experimental Conditions. Int J Mol Sci 2019; 20:ijms20246147. [PMID: 31817544 PMCID: PMC6941009 DOI: 10.3390/ijms20246147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2019] [Revised: 11/29/2019] [Accepted: 12/01/2019] [Indexed: 11/23/2022] Open
Abstract
(+)-(S) and (−)-(R)-5-methyl-Wieland-Miescher ketone (+)-1 and (−)-1, are important synthons in the diastereo and enantioselective syntheses of biological and/or pharmacological interesting compounds. A key step in these syntheses is the chemoselective C(1)O acetalization to (+)-5 and (−)-5, respectively. Various procedures for this transformation have been described in the literature. Among them, the classical procedure based on the use of 1,2-ethanediol and TsOH in refluxing benzene in the presence of a Dean-Stark apparatus. Within our work on bioactive natural products, it occurred to us to observe the partial racemization of (+)-5 in the course of the acetalization of (+)-1 by means of the latter methodology. Aiming to investigate this drawback, which, to our best knowledge, has no precedents in the literature, we acetalized with 1,2-ethanediol and TsOH in refluxing benzene and in the presence of a Dean–Stark apparatus under various experimental conditions, enantiomerically pure (+)-1. It was found that the extent of racemization depends on the TsOH/(+)-1 and 1,2-ethanediol/(+)-1 ratios. Mechanism hypotheses for this partial and unexpected racemization are provided.
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Affiliation(s)
- Francesca Leonelli
- Dipartimento di Biologia Ambientale, Università degli Studi La Sapienza, Piazzale Aldo Moro 5, I-00185 Roma, Italy
- Correspondence: ; Tel.: +39-64991-3197
| | - Irene Piergentili
- Dipartimento di Chimica, Università degli Studi La Sapienza, Piazzale Aldo Moro 5, I-00185 Roma, Italy; (I.P.); (G.L.); (L.M.M.); (R.M.B.)
| | - Giulio Lucarelli
- Dipartimento di Chimica, Università degli Studi La Sapienza, Piazzale Aldo Moro 5, I-00185 Roma, Italy; (I.P.); (G.L.); (L.M.M.); (R.M.B.)
| | - Luisa Maria Migneco
- Dipartimento di Chimica, Università degli Studi La Sapienza, Piazzale Aldo Moro 5, I-00185 Roma, Italy; (I.P.); (G.L.); (L.M.M.); (R.M.B.)
| | - Rinaldo Marini Bettolo
- Dipartimento di Chimica, Università degli Studi La Sapienza, Piazzale Aldo Moro 5, I-00185 Roma, Italy; (I.P.); (G.L.); (L.M.M.); (R.M.B.)
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Al-Khdhairawi AAQ, Cordell GA, Thomas NF, Shivanagere Nagojappa NB, Weber JFF. Natural diterpene pyrones: chemistry and biology. Org Biomol Chem 2019; 17:8943-8957. [PMID: 31482157 DOI: 10.1039/c9ob01501a] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Diterpene pyrones (DTPs) are a group of well-known, mainly fungal, natural products, first isolated in 1966. As the name indicates, they are composed of two main structural features: a diterpenyl moiety and a pyrone ring. Various names have been given to this class of metabolites; however, biogenetic evidence indicates that they originate through the same metabolic pathway. Based on their biosynthesis, which leads to differences in their structural architecture, the DTPs can be classified into three main types. In addition to their intriguing chemistry, these compounds demonstrate a wide range of biological activities rendering them a desirable target for total synthesis. To date, sixty-seven DTPs have been isolated from various fungal species, with one example originating from the plant kingdom. This review aims at unifying the classification of these compounds, in addition to presenting a detailed description of their isolation, bioactivities, biosynthesis, and total synthesis.
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Affiliation(s)
- Amjad Ayad Qatran Al-Khdhairawi
- School of Pharmacy, Faculty of Health & Medical Sciences, Taylor's University Lakeside Campus, 47500 Subang Jaya, Selangor, Malaysia. and Atta-ur-Rahman Institute for Natural Product Discovery (AuRIns), Universiti Teknologi MARA (UiTM) Selangor Branch, 42300 Bandar Puncak Alam, Selangor, Malaysia
| | - Geoffrey A Cordell
- Natural Products Inc., Evanston, IL, USA 60203 and Department of Pharmaceutics, College of Pharmacy, University of Florida, Gainesville, FL, USA 32601
| | - Noel F Thomas
- Methodist College Kuala Lumpur, Brickfields, 50470 Kuala Lumpur, Malaysia
| | | | - Jean-Frédéric F Weber
- Atta-ur-Rahman Institute for Natural Product Discovery (AuRIns), Universiti Teknologi MARA (UiTM) Selangor Branch, 42300 Bandar Puncak Alam, Selangor, Malaysia
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9
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Synthetic efforts towards the stereoselective synthesis of NF00659B 1. Bioorg Med Chem Lett 2018; 28:2746-2750. [PMID: 29503022 DOI: 10.1016/j.bmcl.2018.02.038] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2017] [Accepted: 02/18/2018] [Indexed: 11/21/2022]
Abstract
NF00659B1 is a novel α-pyrone diterpenoid natural product with potent anti-colon cancer activity. A stereoselective approach to the 2,2-dimethyl oxepanol core of NF00659B1 is described enlisting a sequence of olefinic ester ring-closing metathesis, epoxidation, and Grignard addition. This strategy paves the way to a total synthesis of NF00659B1 for further biological studies.
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Rycek L, Hudlicky T. Applications of the Wittig-Still Rearrangement in Organic Synthesis. Angew Chem Int Ed Engl 2017; 56:6022-6066. [PMID: 28211171 DOI: 10.1002/anie.201611329] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2016] [Revised: 02/13/2017] [Indexed: 11/08/2022]
Abstract
This Review traces the discovery of the Wittig-Still rearrangement and its applications in organic synthesis. Its relationship to Wittig rearrangements is discussed along with detailed analysis of E/Z- and diastereoselectivity. Modifications of the products arising from the Wittig-Still rearrangement are reviewed in the context of increased complexity in intermediates potentially useful in target-oriented synthesis. Early applications of the Wittig-Still rearrangement to modifications of steroids are reviewed as are applications to various terpene and alkaloid natural product targets and miscellaneous compounds. To the best of our knowledge, the literature is covered through December 2016.
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Affiliation(s)
- Lukas Rycek
- Department of Chemistry and Centre for Biotechnology, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, Ontario, L2S 3A1, Canada
| | - Tomas Hudlicky
- Department of Chemistry and Centre for Biotechnology, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, Ontario, L2S 3A1, Canada
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Rycek L, Hudlicky T. Anwendungen der Wittig-Still-Umlagerung in der organischen Synthese. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201611329] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Lukas Rycek
- Department of Chemistry and Centre for Biotechnology; Brock University; 1812 Sir Isaac Brock Way St. Catharines Ontario L2S 3A1 Canada
| | - Tomas Hudlicky
- Department of Chemistry and Centre for Biotechnology; Brock University; 1812 Sir Isaac Brock Way St. Catharines Ontario L2S 3A1 Canada
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Fontaneda R, Alonso P, Fañanás FJ, Rodríguez F. Scalable Synthesis of the Amber Odorant 9-epi-Ambrox through a Biomimetic Cationic Cyclization/Nucleophilic Bromination Reaction. Org Lett 2016; 18:4626-9. [PMID: 27588550 DOI: 10.1021/acs.orglett.6b02266] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A novel biomimetic nucleophilic bromocyclization reaction is used in the key step of a new and straightforward synthesis of 9-epi-Ambrox, an organic compound of high interest and value in the context of fragrances. This strategic reaction allows access to 9-epi-Ambrox on a gram scale from a dienyne derivative, easily available from geraniol, following a sequence of seven steps (35% global yield) with just one purification process. Both enantiomers of the molecule were obtained by a challenging enzymatic resolution.
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Affiliation(s)
- Raquel Fontaneda
- Instituto Universitario de Química Organometálica "Enrique Moles", Universidad de Oviedo , Julián Clavería 8, E-33006 Oviedo, Spain
| | - Pedro Alonso
- Instituto Universitario de Química Organometálica "Enrique Moles", Universidad de Oviedo , Julián Clavería 8, E-33006 Oviedo, Spain
| | - Francisco J Fañanás
- Instituto Universitario de Química Organometálica "Enrique Moles", Universidad de Oviedo , Julián Clavería 8, E-33006 Oviedo, Spain
| | - Félix Rodríguez
- Instituto Universitario de Química Organometálica "Enrique Moles", Universidad de Oviedo , Julián Clavería 8, E-33006 Oviedo, Spain
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Blackburn TJ, Kilner MJ, Thomas EJ. Synthetic approaches to phomactins: on the stereoselectivity of some [2,3]-Wittig rearrangements. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.04.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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14
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Construction of 9,10- syn – trans -decalin skeleton via semipinacol rearrangement: asymmetric synthesis of (+)- syn -copalol and a candelalide analog. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.02.075] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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15
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Hoffmeister L, Fukuda T, Pototschnig G, Fürstner A. Total Synthesis of an Exceptional Brominated 4-Pyrone Derivative of Algal Origin: An Exercise in Gold Catalysis and Alkyne Metathesis. Chemistry 2015; 21:4529-33. [DOI: 10.1002/chem.201500437] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Indexed: 02/03/2023]
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Kulcitki V, Harghel P, Ungur N. Unusual cyclic terpenoids with terminal pendant prenyl moieties: from occurrence to synthesis. Nat Prod Rep 2015; 31:1686-720. [PMID: 25118808 DOI: 10.1039/c4np00081a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The paper reviews the known examples of cyclic terpenoids produced from open chain polyenic precursors by an "unusual" biosynthetic pathway, involving selective electrophilic attack on an internal double bond followed by cyclization. The resulting compounds possess cyclic backbones with pendant terminal prenyl groups. Synthetic approaches applied for the synthesis of such specifically functionalized compounds are also discussed, as well as biological activity of reported representatives.
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Affiliation(s)
- Veaceslav Kulcitki
- Institute of Chemistry, Moldova Academy of Sciences, Academiei str. 3, MD-2028, Chişinău, Republic of Moldova.
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Total Synthesis of Diterpenoid Pyrones, Nalanthalide, Sesquicillin, Candelalides A–C, and Subglutinols A, B. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/b978-0-444-63430-6.00001-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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18
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Narita K, Nakamura K, Abe Y, Katoh T. Total Synthesis of Bauhinoxepin J: A Biologically Active Dibenzo[b,f]oxepin Isolated from Bauhinia purpurea. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100845] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Kikuchi T, Mineta M, Ohtaka J, Matsumoto N, Katoh T. Enantioselective Total Synthesis of (-)-Subglutinols A and B: Potential Immunosuppressive Agents Isolated from a Microorganism. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100517] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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20
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Herrmann AT, Martinez SR, Zakarian A. A concise asymmetric total synthesis of (+)-brevisamide. Org Lett 2011; 13:3636-9. [PMID: 21678904 DOI: 10.1021/ol201283n] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new protecting-group-free synthesis of the marine monocyclic ether (+)-brevisamide is reported. The enantioselective synthesis utilizes a key asymmetric Henry reaction and an Achmatowicz rearrangement for the formation of the tetrahydropyran ring. A penultimate Stille cross-coupling allows for an efficient installation of the conjugated (E,E)-diene side chain ultimately delivering (+)-brevisamide.
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Affiliation(s)
- Aaron T Herrmann
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, Santa Barbara, California 93106, USA
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Sakurai J, Kikuchi T, Takahashi O, Watanabe K, Katoh T. Enantioselective Total Synthesis of (+)-Stachyflin: A Potential Anti-Influenza A Virus Agent Isolated from a Microorganism. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100173] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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22
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Kotha S, Chavan AS, Dipak MK. Synthetic approach to cis and trans-decalins via Diels—Alder reaction and ring-closing metathesis as key steps: further extension to dioxapropellane derivative by ring-closing metathesis. Tetrahedron 2011. [DOI: 10.1016/j.tet.2010.10.080] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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23
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Haffner CD, Thomson SA, Guo Y, Petrov K, Larkin A, Banker P, Schaaf G, Dickerson S, Gobel J, Gillie D, Condreay JP, Poole C, Carpenter T, Ulrich J. Substituted N-{3-[(1,1-dioxido-1,2-benzothiazol-3-yl)(phenyl)amino]propyl}benzamide analogs as potent Kv1.3 ion channel blockers. Part 2. Bioorg Med Chem Lett 2010; 20:6989-92. [PMID: 20974533 DOI: 10.1016/j.bmcl.2010.09.131] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2010] [Revised: 09/23/2010] [Accepted: 09/24/2010] [Indexed: 10/19/2022]
Abstract
We report the synthesis and in vitro activity of a series of novel substituted N-{3-[(1,1-dioxido-1,2-benzothiazol-3-yl)(phenyl)amino]propyl}benzamide analogs. These analogs showed potent inhibitory activity against Kv1.3. Several demonstrated similar potency to the known Kv1.3 inhibitor PAP-1 when tested under the IonWorks patch clamp assay conditions. Two compounds 13i and 13rr were advanced further as potential tool compounds for in vivo validation studies.
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Affiliation(s)
- Curt D Haffner
- Department of Medicinal Chemistry, GlaxoSmithKline Research and Development, Research Triangle Park, NC 27709, USA.
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Haffner CD, Thomson SA, Guo Y, Schaller LT, Boggs S, Dickerson S, Gobel J, Gillie D, Condreay JP. N-{3-[(1,1-dioxido-1,2-benzothiazol-3-yl)(phenyl)amino]propyl}benzamide analogs as potent Kv1.3 inhibitors. Part 1. Bioorg Med Chem Lett 2010; 20:6983-8. [PMID: 20971642 DOI: 10.1016/j.bmcl.2010.09.132] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2010] [Revised: 09/23/2010] [Accepted: 09/24/2010] [Indexed: 10/19/2022]
Abstract
We report the synthesis and in vitro activity of a series of novel N-{3-[(1,1-dioxido-1,2-benzothiazol-3-yl)(phenyl)amino]propyl}benzamide analogs. These analogs showed potent inhibitory activity against Kv1.3. Several compounds, including compound 8b, showed similar potency to the known Kv1.3 inhibitor PAP-1 when tested under the IonWorks patch clamp assay conditions.
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Affiliation(s)
- Curt D Haffner
- Department of Medicinal Chemistry, GlaxoSmithKline Research and Development, Research Triangle Park, NC 27709, USA.
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Kim H, Baker J, Park Y, Park HB, DeArmond P, Kim SH, Fitzgerald M, Lee DS, Hong J. Total Synthesis, Assignment of the Absolute Stereochemistry, and Structure-Activity Relationship Studies of Subglutinols A and B. Chem Asian J 2010; 5:1902-10. [DOI: 10.1002/asia.201000147] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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26
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Watanabe K, Sakurai J, Abe H, Katoh T. Total synthesis of (+)-stachyflin: a potential anti-influenza A virus agent. Chem Commun (Camb) 2010; 46:4055-7. [PMID: 20361095 DOI: 10.1039/c000193g] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first enantioselective total synthesis of (+)-stachyflin, a potential anti-influenza A virus agent, was achieved; the method features a BF(3).Et(2)O-induced domino epoxide-opening/rearrangement/cyclization reaction to stereoselectively form the requisite pentacyclic ring system in one step.
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Affiliation(s)
- Kazuhiro Watanabe
- Laboratory of Synthetic Medicinal Chemistry, Department of Chemical Pharmaceutical Science, Tohoku Pharmaceutical University, 4-4-1 Komatsushima, 981-8558, Aoba-ku, Sendai, Japan
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Shishido K, Yoshida M, Takai H, Mitsuhashi C. Concise and Efficient Synthesis of 4-Hydroxy-2-pyrones from Pentane-2,4-diones. HETEROCYCLES 2010. [DOI: 10.3987/com-10-s(e)48] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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