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Tao Y, Reisenauer K, Masi M, Evidente A, Taube JH, Romo D. Pharmacophore-Directed Retrosynthesis Applied to Ophiobolin A: Simplified Bicyclic Derivatives Displaying Anticancer Activity. Org Lett 2020; 22:8307-8312. [PMID: 33034457 PMCID: PMC7655722 DOI: 10.1021/acs.orglett.0c02938] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Pharmacophore-directed retrosynthesis applied to ophiobolin A led to bicyclic derivatives that were synthesized and display anticancer activity. Key features of the ultimate defensive synthetic strategy include a Michael addition/facially selective protonation sequence to set the critical C6 stereocenter and a ring-closing metathesis to form the cyclooctene. Cytotoxicity assays toward a breast cancer cell line (MDA-MB-231) confirm the anticipated importance of structural complexity for selectivity (vs MCF10A cells) while C3 variations modulate stability.
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Affiliation(s)
- Yongfeng Tao
- Department of Chemistry and Biochemistry, Baylor University, 101 Bagby Ave., Waco, TX 76798, United States
| | - Keighley Reisenauer
- Department of Biology, Baylor University, 101 Bagby Ave., Waco, TX 76798, United States
| | - Marco Masi
- Dipartimentodi Scienze Chimiche, Complesso Universitario Monte Sant’ Angelo, Napoli, Italy
| | - Antonio Evidente
- Dipartimentodi Scienze Chimiche, Complesso Universitario Monte Sant’ Angelo, Napoli, Italy
| | - Joseph H. Taube
- Department of Biology, Baylor University, 101 Bagby Ave., Waco, TX 76798, United States
| | - Daniel Romo
- Department of Chemistry and Biochemistry, Baylor University, 101 Bagby Ave., Waco, TX 76798, United States
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2
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Stakanovs G, Mishnev A, Rasina D, Jirgensons A. A Concise Bioinspired Semisynthesis of Rumphellaones A-C and Their C-8 Epimers from β-Caryophyllene. J Nat Prod 2020; 83:2004-2009. [PMID: 32538090 DOI: 10.1021/acs.jnatprod.0c00403] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The first semisynthetic route toward rumphellaones B (2) and C (3) and their C-8 epimers as well as the shortest synthesis of rumphellaone A (1) and its C-8 epimer from the most accessible sesquiterpene, β-caryophyllene (4), is presented. Synthetic routes involved caryophyllonic acid as a key intermediate, which was converted to rumphellaone A (and epimer) via acid-catalyzed lactonization and rumphellaone C (and epimer) using one-pot epoxidation-lactonization. Rumphellaone B (2) and its epimer were obtained from rumphellaone A (1) and its epimer, respectively, using Saegusa-Ito oxidation. The absolute configuration at C-8 was confirmed by single-crystal X-ray analysis of rumphellaone B (2) and an acylated derivative of rumphellaone C.
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Affiliation(s)
- Georgijs Stakanovs
- Latvian Institute of Organic Synthesis, Aizkraukles Street 21, LV-1006, Riga, Latvia
| | - Anatoly Mishnev
- Latvian Institute of Organic Synthesis, Aizkraukles Street 21, LV-1006, Riga, Latvia
| | - Dace Rasina
- Latvian Institute of Organic Synthesis, Aizkraukles Street 21, LV-1006, Riga, Latvia
| | - Aigars Jirgensons
- Latvian Institute of Organic Synthesis, Aizkraukles Street 21, LV-1006, Riga, Latvia
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3
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Abstract
The ophiobolin sesterterpenes are notable plant pathogens which have recently elicited significant chemical and biological attention because of their intriguing carbogenic frameworks, reactive functionalities, and emerging anticancer profiles. Reported herein is a total synthesis of (+)-6-epi-ophiobolin A in 14 steps, a task which addresses construction of the synthetically challenging spirocyclic tetrahydrofuran motif as well as several other key stereochemical problems. This work demonstrates a streamlined synthetic platform to complex ophiobolins leveraging disparate termination modes of a radical polycyclization cascade for divergent elaboration and functionalization.
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Affiliation(s)
| | | | | | | | | | - Thomas J. Maimone
- Department of Chemistry, University of California, Berkeley, 826 Latimer Hall, Berkeley, CA, 94720, USA
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4
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García-Morales C, Ranieri B, Escofet I, López-Suarez L, Obradors C, Konovalov AI, Echavarren AM. Enantioselective Synthesis of Cyclobutenes by Intermolecular [2+2] Cycloaddition with Non-C 2 Symmetric Digold Catalysts. J Am Chem Soc 2017; 139:13628-13631. [PMID: 28922911 PMCID: PMC5679663 DOI: 10.1021/jacs.7b07651] [Citation(s) in RCA: 78] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2017] [Indexed: 01/12/2023]
Abstract
The enantioselective intermolecular gold(I)-catalyzed [2+2] cycloaddition of terminal alkynes and alkenes has been achieved using non-C2-chiral Josiphos digold(I) complexes as catalysts, by the formation of the monocationic complex. This new approach has been applied to the enantioselective total synthesis of rumphellaone A.
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Affiliation(s)
- Cristina García-Morales
- Institute of Chemical
Research of Catalonia (ICIQ), Barcelona Institute of
Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Beatrice Ranieri
- Institute of Chemical
Research of Catalonia (ICIQ), Barcelona Institute of
Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Imma Escofet
- Institute of Chemical
Research of Catalonia (ICIQ), Barcelona Institute of
Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Laura López-Suarez
- Institute of Chemical
Research of Catalonia (ICIQ), Barcelona Institute of
Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Carla Obradors
- Institute of Chemical
Research of Catalonia (ICIQ), Barcelona Institute of
Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Andrey I. Konovalov
- Institute of Chemical
Research of Catalonia (ICIQ), Barcelona Institute of
Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Antonio M. Echavarren
- Institute of Chemical
Research of Catalonia (ICIQ), Barcelona Institute of
Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
- Departament
de Química Orgànica i Analítica, Universitat Rovira i Virgili, C/Marcel·lí Domingo s/n, 43007 Tarragona, Spain
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5
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Urosa A, Marcos IS, Díez D, Lithgow A, Plata GB, Padrón JM, Basabe P. Synthesis and bioactivity of Luffarin I. Mar Drugs 2015; 13:2407-23. [PMID: 25903281 PMCID: PMC4413218 DOI: 10.3390/md13042407] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2015] [Revised: 03/20/2015] [Accepted: 04/07/2015] [Indexed: 11/17/2022] Open
Abstract
The first synthesis of Luffarin I, sesterterpenolide isolated from sponge Luffariella geometrica, has been accomplished from commercially available sclareol. The key strategy involved in this synthesis is the diastereoselective reduction of an intermediate ketone. Luffarin I against human solid tumor cell lines showed antiproliferative activities (GI50) in the range 12–17 μM.
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Affiliation(s)
- Aitor Urosa
- Department of Organic Chemistry, Chemistry Faculty, University of Salamanca, Plaza de los Caídos 1-5, 37008 Salamanca, Spain.
| | - Isidro S Marcos
- Department of Organic Chemistry, Chemistry Faculty, University of Salamanca, Plaza de los Caídos 1-5, 37008 Salamanca, Spain.
| | - David Díez
- Department of Organic Chemistry, Chemistry Faculty, University of Salamanca, Plaza de los Caídos 1-5, 37008 Salamanca, Spain.
| | - Anna Lithgow
- Nuclear Magnetic Resonance Service, University of Salamanca, Plaza de los Caídos 1-5, 37008 Salamanca, Spain.
| | - Gabriela B Plata
- BioLab, University Institute of Bio-Organic "Antonio González" (IUBO-AG), Centre of Biomedicine Research of Canarias (CIBICAN), University of La Laguna, C/Astrofísico Francisco Sánchez 2, 38206 La Laguna, Spain.
| | - José M Padrón
- BioLab, University Institute of Bio-Organic "Antonio González" (IUBO-AG), Centre of Biomedicine Research of Canarias (CIBICAN), University of La Laguna, C/Astrofísico Francisco Sánchez 2, 38206 La Laguna, Spain.
| | - Pilar Basabe
- Department of Organic Chemistry, Chemistry Faculty, University of Salamanca, Plaza de los Caídos 1-5, 37008 Salamanca, Spain.
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Mizutani R, Morimitsu T, Nakashima K, Tori M. Synthesis of a hydrindenone in rings C and D of YW3699. Nat Prod Commun 2013; 8:949-953. [PMID: 23980428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023] Open
Abstract
A hydrindenone in rings C and D of YW3699 was synthesized starting from (-)-isocarvone. The stereochemical requirement in this ring was successfully achieved by Eschenmoser-Claisen rearrangement followed by alkylation and the aldol reaction to afford the desired hydrindenone, which can be used for further elaboration of YW3699.
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Affiliation(s)
- Reiko Mizutani
- Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima 770-8514, Japan
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7
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Kamel HN, Kim YB, Rimoldi JM, Fronczek FR, Ferreira D, Slattery M. Scalarane sesterterpenoids: semisynthesis and biological activity. J Nat Prod 2009; 72:1492-1496. [PMID: 19658408 DOI: 10.1021/np900326a] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Aiming to improve the potency and selectivity of scalarane sesterterpenoids, a series of natural and semisynthetic analogues, derived from the cytotoxic naturally abundant sesterterpene heteronemin (1), were evaluated for their in vitro antimicrobial and cytotoxic properties. The new sesterterpenes 16-O-methylsesterstatin 4 (6c), 17, 24-dihydroheteronemin (7a), 16, 25-deacetoxy-17, 24-dihydroheteronemin (7b), and 16-deacetoxy-25-methoxy-17, 24-dihydroheteronemin (7c) were structurally defined via physical data analyses. Scalarane sesterterpenes possessing an unsaturated 1,4-dialdehyde moiety showed potent inhibitory activity against methicillin-resistant Staphylococcus aureus at concentrations that are not significantly cytotoxic to mammalian cells. The structural features for the cytotoxicity of scalarane sesterterpenoids are discussed.
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Affiliation(s)
- Haidy N Kamel
- Departments of Pharmacognosy and Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, University of Mississippi, University, Mississippi 38677, USA
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Michalak K, Michalak M, Wicha J. Studies towards the total synthesis of di- and sesterterpenes with dicyclopenta[a,d]cyclooctane skeletons. Three-component approach to the A/B rings building block. Molecules 2005; 10:1084-100. [PMID: 18007374 PMCID: PMC6147619 DOI: 10.3390/10091084] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2005] [Accepted: 09/30/2005] [Indexed: 11/30/2022] Open
Abstract
Sesqui- and sesterterpenes of ophiobolin and fusicoccin families are important synthetic targets because of complexity of structure and potentially useful physiological activities, including anti-tumor activity. A synthesis of versatile building blocks for these terpenoids is described. Cyclopenta[8]annulene rings system with properly dislocated substituents was constructed using as key steps ring closing metathesis reaction and Wagner - Meerwein rearrangement. Ring closing metathesis reaction leading to cyclopenta[8]annulene was studied in detail.
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Affiliation(s)
| | | | - Jerzy Wicha
- Author to whom correspondence should be addressed; E-mail:
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