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Mali G, Chauhan ANS, Chavan KA, Erande RD. Development and Applications of Double Diels‐Alder Reaction in Organic Synthesis. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100493] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ghanshyam Mali
- Department of Chemistry Indian Institute of Technology Jodhpur Jodhpur 342037 India
| | | | - Kailas Arjun Chavan
- Department of Chemistry Indian Institute of Technology Jodhpur Jodhpur 342037 India
| | - Rohan D. Erande
- Department of Chemistry Indian Institute of Technology Jodhpur Jodhpur 342037 India
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Jo M, Lee D, Kwak YS. Rapid Access to the Structural Core of Aflavinines via Stereoselective Tandem Intramolecular Diels-Alder Cycloaddition Controlled by the Allylic 1,3-Strain. Org Lett 2019; 21:6529-6533. [PMID: 31368715 DOI: 10.1021/acs.orglett.9b02457] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An expedient route to access the functionalized structural core of aflavinines has been developed starting from three readily available fragments over 12 steps in 29.1% overall yield without using any transition metal catalysis. The key feature of this approach is a tandem intramolecular Diels-Alder cycloaddition to complete the hexacyclic framework with the correct stereochemistry and all the requisite structural elements in place to achieve the total synthesis of aflavinine and its congeners.
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Affiliation(s)
- Minmi Jo
- College of Pharmacy , Korea University , Sejong 30019 , Republic of Korea
| | - Dongjoo Lee
- College of Pharmacy and Research Institute of Pharmaceutical Science and Technology (RIPST) , Ajou University , Suwon 16499 , Republic of Korea
| | - Young-Shin Kwak
- College of Pharmacy , Korea University , Sejong 30019 , Republic of Korea
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Donald JR, Unsworth WP. Ring-Expansion Reactions in the Synthesis of Macrocycles and Medium-Sized Rings. Chemistry 2017; 23:8780-8799. [DOI: 10.1002/chem.201700467] [Citation(s) in RCA: 147] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Indexed: 01/20/2023]
Affiliation(s)
- James R. Donald
- Department of Chemistry; University of York; Heslington, York YO10 5DD UK
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Parvatkar PT, Kadam HK, Tilve SG. Intramolecular Diels–Alder reaction as a key step in tandem or sequential processes: a versatile tool for the synthesis of fused and bridged bicyclic or polycyclic compounds. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.02.048] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Drahl MA, Manpadi M, Williams LJ. C-C fragmentation: origins and recent applications. Angew Chem Int Ed Engl 2013; 52:11222-51. [PMID: 24115282 DOI: 10.1002/anie.201209833] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2012] [Indexed: 11/07/2022]
Abstract
It has been 60 years since Eschenmoser and Frey disclosed the archetypal CC fragmentation reaction. New fragmentations and several variants of the original quickly followed. Many of these variations, which include the Beckmann, Grob, Wharton, Marshall, and Eschenmoser-Tanabe fragmentations, have been reviewed over the intervening years. A close examination of the origins of fragmentation has not been described. Recently, useful new methods have flourished, particularly fragmentations that give alkynes and allenes, and such reactions have been applied to a range of complex motifs and natural products. This Review traces the origins of fragmentation reactions and provides a summary of the methods, applications, and new insights of heterolytic CC fragmentation reactions advanced over the last 20 years.
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Affiliation(s)
- Michael A Drahl
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, NJ 08854 (USA)
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Drahl MA, Manpadi M, Williams LJ. C-C-Fragmentierung: Herkunft und jüngste Anwendungen. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201209833] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Evans-Illidge EA, Logan M, Doyle J, Fromont J, Battershill CN, Ericson G, Wolff CW, Muirhead A, Kearns P, Abdo D, Kininmonth S, Llewellyn L. Phylogeny drives large scale patterns in Australian marine bioactivity and provides a new chemical ecology rationale for future biodiscovery. PLoS One 2013; 8:e73800. [PMID: 24040076 PMCID: PMC3763996 DOI: 10.1371/journal.pone.0073800] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2012] [Accepted: 07/23/2013] [Indexed: 12/27/2022] Open
Abstract
Twenty-five years of Australian marine bioresources collecting and research by the Australian Institute of Marine Science (AIMS) has explored the breadth of latitudinally and longitudinally diverse marine habitats that comprise Australia's ocean territory. The resulting AIMS Bioresources Library and associated relational database integrate biodiversity with bioactivity data, and these resources were mined to retrospectively assess biogeographic, taxonomic and phylogenetic patterns in cytotoxic, antimicrobial, and central nervous system (CNS)-protective bioactivity. While the bioassays used were originally chosen to be indicative of pharmaceutically relevant bioactivity, the results have qualified ecological relevance regarding secondary metabolism. In general, metazoan phyla along the deuterostome phylogenetic pathway (eg to Chordata) and their ancestors (eg Porifera and Cnidaria) had higher percentages of bioactive samples in the assays examined. While taxonomy at the phylum level and higher-order phylogeny groupings helped account for observed trends, taxonomy to genus did not resolve the trends any further. In addition, the results did not identify any biogeographic bioactivity hotspots that correlated with biodiversity hotspots. We conclude with a hypothesis that high-level phylogeny, and therefore the metabolic machinery available to an organism, is a major determinant of bioactivity, while habitat diversity and ecological circumstance are possible drivers in the activation of this machinery and bioactive secondary metabolism. This study supports the strategy of targeting phyla from the deuterostome lineage (including ancestral phyla) from biodiverse marine habitats and ecological niches, in future biodiscovery, at least that which is focused on vertebrate (including human) health.
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Affiliation(s)
| | - Murray Logan
- Australian Institute of Marine Science, Townsville, Queensland, Australia
| | - Jason Doyle
- Australian Institute of Marine Science, Townsville, Queensland, Australia
| | - Jane Fromont
- Western Australian Museum, Welshpool, Western Australia, Australia
| | | | - Gavin Ericson
- Australian Institute of Marine Science, Townsville, Queensland, Australia
| | - Carsten W. Wolff
- Australian Institute of Marine Science, Townsville, Queensland, Australia
| | - Andrew Muirhead
- Australian Institute of Marine Science, Townsville, Queensland, Australia
| | - Phillip Kearns
- Australian Institute of Marine Science, Townsville, Queensland, Australia
| | - David Abdo
- Australian Institute of Marine Science, Townsville, Queensland, Australia
| | - Stuart Kininmonth
- Australian Institute of Marine Science, Townsville, Queensland, Australia
| | - Lyndon Llewellyn
- Australian Institute of Marine Science, Townsville, Queensland, Australia
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Bao B, Meng Z, Li N, Meng Z, Zhang L, Cao Y, Yao W, Shan M, Ding A. Design, synthesis and antiviral activity studies of schizonepetin derivatives. Int J Mol Sci 2013; 14:17193-203. [PMID: 23965980 PMCID: PMC3759959 DOI: 10.3390/ijms140817193] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2013] [Revised: 07/29/2013] [Accepted: 08/07/2013] [Indexed: 11/16/2022] Open
Abstract
A series of schizonepetin derivatives have been designed and synthesized in order to obtain potent antivirus agents. The antiviral activity against HSV-1 and influenza virus H3N2 as well as the cytotoxicity of these derivatives was evaluated by using cytopathic effect (CPE) inhibition assay in vitro. Compounds M2, M4, M5 and M34 showed higher inhibitory activity against HSV-1 virus with the TC50 values being in micromole. Compounds M28, M33, and M35 showed higher inhibitory activity against influenza virus H3N2 with their TC50 values being 96.4, 71.0 and 75.4 μM, respectively. Preliminary biological activity evaluation indicated that the anti-H3N2 and anti-HSV-1 activities improved obviously through the introduction of halogen into the structure of schizonepetin.
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Affiliation(s)
- Beihua Bao
- Jiangsu Key Laboratory for High Technology of TCM Formulae Research, College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China; E-Mails: (B.B.); (Z.M.); (N.L.); (Y.C.); (W.Y.); (M.S.)
| | - Zheng Meng
- Jiangsu Key Laboratory for High Technology of TCM Formulae Research, College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China; E-Mails: (B.B.); (Z.M.); (N.L.); (Y.C.); (W.Y.); (M.S.)
| | - Nianguang Li
- Jiangsu Key Laboratory for High Technology of TCM Formulae Research, College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China; E-Mails: (B.B.); (Z.M.); (N.L.); (Y.C.); (W.Y.); (M.S.)
| | - Zhengjie Meng
- College of Biotechnology and Pharmaceutical Engineering, Nanjing University of Technology, Nanjing 211816, China; E-Mail:
| | - Li Zhang
- Jiangsu Key Laboratory for High Technology of TCM Formulae Research, College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China; E-Mails: (B.B.); (Z.M.); (N.L.); (Y.C.); (W.Y.); (M.S.)
- Authors to whom correspondence should be addressed; E-Mails: (L.Z.); (A.D.); Tel.: +86-25-8581-1523 (A.D.); Fax: +86-25-8581-1524 (A.D.)
| | - Yudan Cao
- Jiangsu Key Laboratory for High Technology of TCM Formulae Research, College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China; E-Mails: (B.B.); (Z.M.); (N.L.); (Y.C.); (W.Y.); (M.S.)
| | - Weifeng Yao
- Jiangsu Key Laboratory for High Technology of TCM Formulae Research, College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China; E-Mails: (B.B.); (Z.M.); (N.L.); (Y.C.); (W.Y.); (M.S.)
| | - Mingqiu Shan
- Jiangsu Key Laboratory for High Technology of TCM Formulae Research, College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China; E-Mails: (B.B.); (Z.M.); (N.L.); (Y.C.); (W.Y.); (M.S.)
| | - Anwei Ding
- Jiangsu Key Laboratory for High Technology of TCM Formulae Research, College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China; E-Mails: (B.B.); (Z.M.); (N.L.); (Y.C.); (W.Y.); (M.S.)
- Authors to whom correspondence should be addressed; E-Mails: (L.Z.); (A.D.); Tel.: +86-25-8581-1523 (A.D.); Fax: +86-25-8581-1524 (A.D.)
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Berrué F, McCulloch MWB, Kerr RG. Marine diterpene glycosides. Bioorg Med Chem 2011; 19:6702-19. [PMID: 21783368 DOI: 10.1016/j.bmc.2011.06.083] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2011] [Revised: 06/16/2011] [Accepted: 06/28/2011] [Indexed: 10/18/2022]
Abstract
Marine diterpene glycosides (MDGs) respresent a small but highly significant group of the much larger class of marine diterpenes. The three well-studied examples of MDGs are eleutherobins, pseudopterosins and fuscosides, all of which exhibit extremely promising biological activity. The eleutherobins are potent anti-mitotic agents, and the pseudopterosins and fuscosides are potent anti-inflammatory agents. This review discusses the structures and biological activities of these compounds, as well as their biosynthesis and synthesis.
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Affiliation(s)
- Fabrice Berrué
- Department of Chemistry, University of Prince Edward Island, Charlottetown, PEI, Canada
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Nandurdikar RS, Subrahmanyam AV, Kaliappan KP. Synthesis of a Novel Taxa-Oxa-Sugar Hybrid Core Structure by Tandem Cross-Enyne Metathesis/IMDA. European J Org Chem 2010. [DOI: 10.1002/ejoc.201000001] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Prantz K, Mulzer J. Synthetic Applications of the Carbonyl Generating Grob Fragmentation. Chem Rev 2010; 110:3741-66. [DOI: 10.1021/cr900386h] [Citation(s) in RCA: 145] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kathrin Prantz
- Institute of Organic Chemistry, University of Vienna, Währingerstrasse 38, A-1090 Vienna, Austria
| | - Johann Mulzer
- Institute of Organic Chemistry, University of Vienna, Währingerstrasse 38, A-1090 Vienna, Austria
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Yadav JS, Antony A, George J, Subba Reddy BV. Recent Developments in Indium Metal and Its Salts in Organic Synthesis. European J Org Chem 2010. [DOI: 10.1002/ejoc.200900895] [Citation(s) in RCA: 91] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- J. S. Yadav
- Division of Organic Chemistry, Indian Institute of Chemical Technology, Hyderabad 500007, India, Fax: +91‐40‐7160512
| | - Aneesh Antony
- Division of Organic Chemistry, Indian Institute of Chemical Technology, Hyderabad 500007, India, Fax: +91‐40‐7160512
| | - Jimil George
- Division of Organic Chemistry, Indian Institute of Chemical Technology, Hyderabad 500007, India, Fax: +91‐40‐7160512
| | - Basi V. Subba Reddy
- Division of Organic Chemistry, Indian Institute of Chemical Technology, Hyderabad 500007, India, Fax: +91‐40‐7160512
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Deng Y, Jin X, Fu C, Ma S. Efficient highly selective synthesis of methyl 2-(ethynyl)alk-2(E)-enoates and 2-(1'-chlorovinyl)alk-2(Z)-enoates from 2-(methoxycarbonyl)-2,3-allenols. Org Lett 2009; 11:2169-72. [PMID: 19419214 DOI: 10.1021/ol9004273] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Highly regio- and stereoselective reactions of readily available 2-(methoxycarbonyl)-2,3-allenols 1 with oxalyl chloride in the presence of Et(3)N or DMSO afforded methyl 2-(ethynyl)alk-2(E)-enoates (E)-2 and 2-(1'-chlorovinyl)alk-2(Z)-enoates (Z)-3, respectively, in moderate to good yields.
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Affiliation(s)
- Youqian Deng
- Laboratory of Molecular Recognition and Synthesis, Department of Chemistry, Zhejiang University, Hangzhou 310027, Zhejiang, People's Republic of China
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Malik CK, Hossain MF, Ghosh S. A new approach to A/B ring analogue of eleutherobin and sarcodictyns through a sequence of highly diastereofaceselective Diels–Alder reaction and ring opening–ring closing metathesis (RO–RCM). Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.04.033] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Montagnon T, Tofi M, Vassilikogiannakis G. Using singlet oxygen to synthesize polyoxygenated natural products from furans. Acc Chem Res 2008; 41:1001-11. [PMID: 18605738 DOI: 10.1021/ar800023v] [Citation(s) in RCA: 244] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[Reaction: see text]. Singlet oxygen is a powerful tool in the armament of the synthetic organic chemist and possibly in that of nature itself. In this Account, we illustrate a small selection of the many ways singlet oxygen can be harnessed in the laboratory to aid in the construction of the complex molecular motifs found in natural products. A more philosophical question is also addressed: namely, how much do singlet oxygen oxidations influence the biogenesis of these natural products? All the synthetic examples surveyed in this Account can be characterized as belonging to the same class because they all involve the oxidation of a substituted furan nucleus by singlet oxygen. Readily accessible and relatively simple furans can be transformed into a host of complex motifs present in a diverse range of natural products by the action of singlet-oxygen-mediated reaction sequences. These reactions are highly advantageous because they frequently deliver a rapid and dramatic increase in molecular complexity in high yield. Furthermore, an unusually wide structural diversity is exhibited by the molecular motifs obtained from these reaction sequences. For example, relatively minor modifications to the starting substrate and to the reaction conditions may lead to products as variable as spiroketal lactones, 3-keto-tetrahydrofurans, various types of bis-spiroketals, 4-hydroxy cyclopentenones, or spiroperoxylactones. In addition, two more specialized examples are discussed in this Account. The core of the prunolide molecules and the chinensine family of natural products were rapidly synthesized using effective and short singlet oxygen mediated strategies; this adds weight to the assertion that singlet oxygen is a very effective moderator of complex cascade reaction sequences. We also show how our synthetic investigations have provided evidence that these same strategies might be used in the biogenesis of these molecules. In the cases of the chinensines and the litseaverticillols, an entire and diverse family of natural products was synthesized beginning from known naturally occurring furan-bearing terpenes. Additionally, in several cases, intermediates in our syntheses have been isolated from natural sources, which suggests that we have followed the same synthetic paths as nature. Certainly, the limit of the synthetic potential of singlet oxygen has not yet been reached, and we can look forward to seeing the boundaries expand in the future in a slew of new and interesting ways.
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Affiliation(s)
- Tamsyn Montagnon
- University of Crete, Department of Chemistry, Vasilika Vouton, 71003 Iraklion, Crete, Greece
| | - Maria Tofi
- University of Crete, Department of Chemistry, Vasilika Vouton, 71003 Iraklion, Crete, Greece
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Park C, Lee PH. Indium-Mediated Regio- and Chemoselective Synthesis of α-Hydroxyalkyl Allenic Esters and Gold-Catalyzed Cyclizations to Ethyl 2-Naphthoate Derivatives. Org Lett 2008; 10:3359-62. [DOI: 10.1021/ol801196g] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chansoo Park
- National Research Laboratory for Catalytic Organic Reaction, Department of Chemistry, and Institute for Molecular Science and Fusion Technology, Kangwon National University, Chunchon 200-701, Republic of Korea
| | - Phil Ho Lee
- National Research Laboratory for Catalytic Organic Reaction, Department of Chemistry, and Institute for Molecular Science and Fusion Technology, Kangwon National University, Chunchon 200-701, Republic of Korea
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Deng Y, Li J, Ma S. PdI2-Catalyzed Coupling–Cyclization Reactions Involving Two Different 2,3-Allenols: An Efficient Synthesis of 4-(1′,3′-Dien-2′-yl)-2,5-dihydrofuran Derivatives. Chemistry 2008; 14:4263-6. [DOI: 10.1002/chem.200800167] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Xu B, Hammond G. Thermodynamically Favored Aldol Reaction of Propargyl or Allenyl Esters: Regioselective Synthesis of Carbinol Allenoates. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200704221] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Xu B, Hammond G. Thermodynamically Favored Aldol Reaction of Propargyl or Allenyl Esters: Regioselective Synthesis of Carbinol Allenoates. Angew Chem Int Ed Engl 2008; 47:689-92. [DOI: 10.1002/anie.200704221] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Busch T, Kirschning A. Recent advances in the total synthesis of pharmaceutically relevant diterpenes. Nat Prod Rep 2008; 25:318-41. [DOI: 10.1039/b705652b] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Margaros I, Montagnon T, Vassilikogiannakis G. Spiroperoxy Lactones from Furans in One Pot: Synthesis of (+)-Premnalane A. Org Lett 2007; 9:5585-8. [DOI: 10.1021/ol702575a] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ioannis Margaros
- Department of Chemistry, University of Crete, Vasilika Vouton, 71003 Iraklion, Crete, Greece
| | - Tamsyn Montagnon
- Department of Chemistry, University of Crete, Vasilika Vouton, 71003 Iraklion, Crete, Greece
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Sandoval C, López-Pérez JL, Bermejo F. Synthesis of a 10-membered ring with eleutheside functionality by Nozaki–Hiyama–Kishi coupling. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.08.099] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Dhulut S, Bourin A, Lannou MI, Fleury E, Lensen N, Chelain E, Pancrazi A, Ardisson J, Fahy J. Cyclic Allyl Carbamates in Stereoselectivesyn SE′ Processes: Synthetic Approach to Sarcodictyins and Eleutherobin. European J Org Chem 2007. [DOI: 10.1002/ejoc.200700490] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Jiang X, Ma S. trans-RhCl(CO)(PPh3)2-Catalyzed Monomeric and Dimeric Cycloisomerization of Propargylic 2,3-Dienoates. Establishment of α,β-Unsaturated δ-Lactone Rings by Cyclometallation. J Am Chem Soc 2007; 129:11600-7. [PMID: 17725354 DOI: 10.1021/ja073582u] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cyclometallation of two unsaturated carbon-carbon bonds usually requires the application of low-valent metal catalysts, which could cleave the propargylic ester linkage. Thus, it is desirable to identify a catalyst which could undergo cyclometallation without cleaving the propargylic ester linkage. In this paper, we used trans-RhCl(CO)(PPh(3))(2) to realize the cyclometallation of propargylic 2,3-dienoates. The substituents at the 4-position of allenoate moiety nicely control the reaction pathway: when the 4-position of propargylic 2,3-dienoate 1 was monosubstituted with an aryl group, the bicyclic intermediate 7 formed by the cyclometallation could highly selectively undergo carbometalation with the alkyne moiety in the second molecule of propargylic 2,3-dienoate 1 to afford metallabicyclic intermediates 8a or 8b. Subsequent reductive elimination would afford 9, which could undergo an intramolecular Diels-Alder reaction resulting in the formation of polycyclic bis(delta-lactone)-containing structures 2. The intermediate could be trapped by adding 3-methoxyprop-1-yne affording cyclization-aromatization product 4p highly selectively. If the substituent at the 4-positon of the 2,3-allenoate moiety has a beta-H atom, sequential unimolecular cyclometallation/beta-H elimination/reductive elimination occurs to afford cross-conjugated 5(Z)-alkylidene-4-alkenyl-5,6-dihydropyran-2-ones. The Z-stereochemistry of the exo double bond was determined by the cyclometallation. Some of the alpha,beta-unsaturated delta-lactones could be easily converted to other synthetically useful compounds via reduction reaction, hydrogenation, and iodination/coupling protocol.
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Affiliation(s)
- Xuefeng Jiang
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, P. R. China
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Deng Y, Jin X, Ma S. Studies on Highly Stereoselective Addition−Elimination Reactions of 3-(Methoxycarbonyl)-1,2-allen-4-ols with MX. An Efficient Synthesis of 3-(Methoxycarbonyl)-2-halo-1,3(Z)-dienes. J Org Chem 2007; 72:5901-4. [PMID: 17585823 DOI: 10.1021/jo070725m] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
3-(Methoxycarbonyl)-2-halo-1,3(Z)-dienes were prepared highly stereoselectively via SN2'-type addition-elimination reactions of 3-(methoxycarbonyl)-1,2-allen-4-ols with MX. These products may easily undergo Negishi or Sonogashira coupling reactions to yield a series of stereodefined polysubstituted (E)-1,3-dienes.
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Affiliation(s)
- Youqian Deng
- Laboratory of Molecular Recognition and Synthesis, Department of Chemistry, Zhejiang University, Hangzhou 310027, Zhejiang, People's Republic of China
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Miura T, Kiyota K, Kusama H, Iwasawa N. W(CO)5(L)-catalyzed 6-endo-selective cyclization and formal Cope rearrangement of allenyl silyl enol ethers. J Organomet Chem 2007. [DOI: 10.1016/j.jorganchem.2006.08.037] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Trost BM, Huang X. Synthesis of Substituted 1,3-Diene Synthetic Equivalents by a Ru-Catalyzed Diyne Hydrative Cyclization. Chem Asian J 2006; 1:469-78. [PMID: 17441084 DOI: 10.1002/asia.200600109] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Catalyzed by [CpRu(CH3CN)3]PF6, the hydrative cyclization of dipropargylic sulfone substrates provides an effective way to synthesize highly functionalized substituted 3-sulfolenes. The amount of water is crucial for the reactivity of this cycloisomerization reaction. The scope and limitations of the Ru-catalyzed cycloisomerization are discussed. A marked ketone-directing effect was observed for the first time in ruthenium-catalyzed cyclizations. A plausible mechanism for the ketone-directed cycloisomerization is also rationalized. The utility of this method was demonstrated by both sulfur dioxide extrusion of the 3-sulfolenes to afford 1,3-dienes and subsequent inter- or intramolecular Diels-Alder reactions.
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Affiliation(s)
- Barry M Trost
- Department of Chemistry, Stanford University, Stanford, CA 94305-5080, USA.
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29
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30
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Castoldi D, Caggiano L, Panigada L, Sharon O, Costa AM, Gennari C. A Formal Total Synthesis of Eleutherobin Using the Ring-Closing Metathesis (RCM) Reaction of a Densely Functionalized Diene as the Key Step: Investigation of the Unusual Kinetically Controlled RCM Stereochemistry. Chemistry 2006; 12:51-62. [PMID: 16173100 DOI: 10.1002/chem.200500749] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Asymmetric oxyallylation reactions and ring-closing metathesis have been used to synthesize compound 3, a key advanced intermediate used in the total synthesis of eleutherobin reported by Danishefsky and co-workers. The aldehyde 6, which is readily prepared from commercially available R-(-)-carvone in six steps in 30 % overall yield on multigram quantities, was converted into the diene 5 utilizing two stereoselective titanium-mediated Hafner-Duthaler oxyallylation reactions. The reactions gave the desired products (8 and 12) in high yields (73 and 83 %, respectively) as single diastereoisomers, with the allylic alcohol already protected as the p-methoxyphenyl (PMP) ether, which previous work has demonstrated actually aids ring-closing metathesis compared to other protective groups and the corresponding free alcohol. Cyclization under forcing conditions, using Grubbs' second-generation catalyst 13, gave the ten-membered carbocycle (E)-14 in 64 % yield. This result is in sharp contrast to similar, but less functionalized, dienes, which have all undergone cyclization to give the Z stereoisomers exclusively. A detailed investigation of this unusual cyclization stereochemistry by computational methods has shown that the E isomer of the ten-membered carbocycle is indeed less thermodynamically stable than the corresponding Z isomer. In fact, the selectivity is believed to be due to the dense functionality around the ruthenacyclobutane intermediate that favors the trans-ruthenacycle, which ultimately leads to the less stable E isomer of the ten-membered carbocycle under kinetic control. During the final synthetic manipulations the double bond of enedione (E)-16 isomerized to the more thermodynamically stable enedione (Z)-4, giving access to the advanced key-intermediate 3, which was spectroscopically and analytically identical to the data reported by Danishefsky and co-workers, and thereby completing the formal synthesis of eleutherobin.
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Affiliation(s)
- Damiano Castoldi
- Dipartimento di Chimica Organica e Industriale, Centro di Eccellenza C.I.S.I. Università degli Studi di Milano, Istituto di Scienze e Tecnologie Molecolari (ISTM) del CNR, Via G. Venezian, 21, 20133 Milano, Italy
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31
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Ma S, Lu P, Lu L, Hou H, Wei J, He Q, Gu Z, Jiang X, Jin X. What Can a Metal Catalyst Do with Allenes? One-Step Formation of Steroid Scaffolds from Readily Available Starting Materials. Angew Chem Int Ed Engl 2005; 44:5275-8. [PMID: 16035021 DOI: 10.1002/anie.200501350] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Shengming Ma
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai.
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32
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Ma S, Lu P, Lu L, Hou H, Wei J, He Q, Gu Z, Jiang X, Jin X. What Can a Metal Catalyst Do with Allenes? One-Step Formation of Steroid Scaffolds from Readily Available Starting Materials. Angew Chem Int Ed Engl 2005. [DOI: 10.1002/ange.200501350] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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33
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Efficient metathesis route to the B-ring of eleutherobin and other medium-sized cyclic ethers. Tetrahedron 2005. [DOI: 10.1016/j.tet.2005.05.045] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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34
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Jung ME, Min SJ. Intramolecular Diels−Alder Reactions of Optically Active Allenic Ketones: Chirality Transfer in the Preparation of Substituted Oxa-Bridged Octalones. J Am Chem Soc 2005; 127:10834-5. [PMID: 16076181 DOI: 10.1021/ja052771e] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The intramolecular Diels-Alder reaction of allenic ketones containing a furyl unit (IMDAF) to generate oxatricyclic systems in good yields is described. The alkene dienophiles 1ab give poor yields of the cycloadducts 2ab, presumably due to the facile retro Diels-Alder reaction. However, the analogous allenic dienophile 7 afforded the desired cycloadduct 8 in 91% yield on treatment with dimethylaluminum chloride. When the allene bears an alkyl substituent on the terminal carbon, complete diastereoselectivity is seen in the IMDAF, e.g. cyclization of 14 gave only the cycloadduct 15 in 80% yield presumably due to greater steric hindrance in the transition state II as compared to that in I. Finally we report complete chirality transfer of the stereochemistry of an allene to the carbon framework of the oxatricyclic system. Thus, the optically active allenic ketone 20 afforded only the desired cycloadduct 21 with the correct absolute stereochemistry needed for the synthesis of the arisugacin class of natural products.
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Affiliation(s)
- Michael E Jung
- Department of Chemistry and Biochemistry, University of California-Los Angeles, CA 90095-1569, USA.
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35
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Affiliation(s)
- Shengming Ma
- Laboratory of Molecular Recognition and Synthesis, Department of Chemistry, Zhejiang University, Hangzhou 310027, Zhejiang, People's Republic of China
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36
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Trost BM, Huang X. Ruthenium-Catalyzed Diyne Hydrative Cyclization: Synthesis of Substituted 1,3-Diene Synthons. Org Lett 2005; 7:2097-9. [PMID: 15901143 DOI: 10.1021/ol0502937] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text]. A novel and versatile strategy for the synthesis of highly functionalized substituted 3-sulfolenes based on [CpRu(CH3CN)3]PF6-catalyzed hydrative cyclization has been developed. A marked ketone directing effect in ruthenium-catalyzed cyclization was observed for the first time. This provides complementary chemoselectivity for the synthesis of 3-sulfolenes and other cyclic enones. The utility of this method has been demonstrated by SO2 extrusion of 3-sulfolenes to afford 1,3-dienes and the subsequent inter- and intramolecular Diels-Alder reaction.
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Affiliation(s)
- Barry M Trost
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, USA.
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37
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Sperry JB, Constanzo JR, Jasinski J, Butcher RJ, Wright DL. Studies on the Diels–Alder reaction of annulated furans: application to the synthesis of substituted phenanthrenes. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.02.148] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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38
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Friedel M, Golz G, Mayer P, Lindel T. Oxidative cyclization of a seco-cladiellane diterpenoid. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.01.080] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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39
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Castoldi D, Caggiano L, Bayón P, Costa AM, Cappella P, Sharon O, Gennari C. Synthesis of novel, simplified, C-7 substituted eleutheside analogues with potent microtubule-stabilizing activity. Tetrahedron 2005. [DOI: 10.1016/j.tet.2004.12.039] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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40
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Castoldi D, Caggiano L, Panigada L, Sharon O, Costa AM, Gennari C. A Formal Total Synthesis of Eleutherobin Through an Unprecedented Kinetically Controlled Ring-Closing-Metathesis Reaction of a Densely Functionalized Diene. Angew Chem Int Ed Engl 2005; 44:588-91. [PMID: 15597390 DOI: 10.1002/anie.200461767] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Damiano Castoldi
- Dipartimento di Chimica Organica e Industriale, Centro di Eccellenza C.I.S.I., Università degli Studi di Milano, Istituto di Scienze e Tecnologie Molecolari del CNR, Via G. Venezian 21, 20133 Milano, Italy
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41
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Castoldi D, Caggiano L, Panigada L, Sharon O, Costa AM, Gennari C. A Formal Total Synthesis of Eleutherobin Through an Unprecedented Kinetically Controlled Ring-Closing-Metathesis Reaction of a Densely Functionalized Diene. Angew Chem Int Ed Engl 2005. [DOI: 10.1002/ange.200461767] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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42
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Chapter 5.3 Five-membered ring systems: Furans and benzofurans. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/s0959-6380(05)80049-2] [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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43
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Lepore SD, He Y, Damisse P. Studies on the Base-Promoted Conversion of Conjugated Alkynyl Esters to α-Substituted α-Allenyl Esters. J Org Chem 2004; 69:9171-5. [PMID: 15609951 DOI: 10.1021/jo0487754] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report the development of an efficient method for the conversion of a variety of conjugated alkynyl esters to alpha-substituted conjugated allenyl esters (racemic) through the use of strong amide bases. Substantially improved yields over typical enolate formation conditions were observed with the use of 2 equiv of lithium diisopropylamide. Trapping studies indicate that the second equivalent of base likely leads to the dianion intermediate, which upon addition of methyl iodide, trimethylsilyl chloride, or tributyltin chloride gives mixtures of alpha-substituted conjugated allenyl and beta,gamma-alkynyl deconjugated esters. Further optimization revealed that additive salts such as LiCl lead primarily to the allenyl product while the use of HMPA as a cosolvent gives the beta,gamma-alkynyl deconjugated alkylation product. The role of base, base concentration, and electrophile on product yield and selectivity is also discussed.
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Affiliation(s)
- Salvatore D Lepore
- Department of Chemistry, Florida Atlantic University, Boca Raton, Florida 33431, USA.
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44
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45
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Beumer R, Bayón P, Bugada P, Ducki S, Mongelli N, Sirtori FR, Telser J, Gennari C. Synthesis of novel simplified sarcodictyin/eleutherobin analogs with potent microtubule-stabilizing activity, using ring closing metathesis as the key-step. Tetrahedron 2003. [DOI: 10.1016/j.tet.2003.08.057] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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