1
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Vitali Forconesi G, Basso A, Banfi L, Gugliotta D, Lambruschini C, Nola M, Riva R, Rocca V, Moni L. Total Synthesis of 4- epi-Bengamide E. Molecules 2024; 29:1715. [PMID: 38675534 PMCID: PMC11052282 DOI: 10.3390/molecules29081715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2024] [Revised: 04/08/2024] [Accepted: 04/09/2024] [Indexed: 04/28/2024] Open
Abstract
Bengamide E is a bioactive natural product that was isolated from Jaspidae sponges by Crews and co-workers in 1989. It displays a wide range of biological activities, including antitumor, antibiotic, and anthelmintic properties. With the aim of investigating the structural feature essential for their activity, several total syntheses of Bengamide E and its analogues have been reported in the literature. Nevertheless, no synthesis of the stereoisomer with modification of its configuration at C-4 carbon has been reported so far. Here, we report the first total synthesis of the 4-epi-Bengamide E. Key reactions in the synthesis include a chemoenzimatic desymmetrization of biobased starting materials and a diastereoselective Passerini reaction using a chiral, enantiomerically pure aldehyde, and a lysine-derived novel isocyanide.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Lisa Moni
- Department of Chemistry and Industrial Chemistry, University of Genova, Via Dodecaneso, 31, 16146 Genova, Italy; (G.V.F.); (A.B.); (L.B.); (D.G.); (C.L.); (M.N.); (R.R.); (V.R.)
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2
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Ishihara J. Progress in Lewis-Acid-Templated Diels-Alder Reactions. Molecules 2024; 29:1187. [PMID: 38474699 DOI: 10.3390/molecules29051187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2023] [Revised: 03/04/2024] [Accepted: 03/05/2024] [Indexed: 03/14/2024] Open
Abstract
The synthesis of natural products with complicated architectures often requires the use of segments with functional groups that can be structurally transformed with the desired stereogenic centers. Bicyclic 𝛾-lactones have great potential as a suitable segment for natural product synthesis. However, the stereoselective construction of such functionalized bicyclic 𝛾-lactones is not as straightforward as one might expect. The template-mediated Diels-Alder reaction is one of the most powerful and versatile methods for providing bicyclic 𝛾-lactones with high regioselectivity and stereoselectivity. In this reaction, the diene is linked to the dienophile by a temporary tether, allowing the reaction to proceed efficiently, yielding a product that can be used for natural product synthesis. This review describes some important instances of the template-mediated Diels-Alder reaction and its application to the synthesis of biologically active compounds.
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Affiliation(s)
- Jun Ishihara
- Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 853-8521, Japan
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3
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Xue D, Que Y, Shao H, He H, Zhao X, Gao S. Stereoselective Synthesis of the Core Structures of Pyrrocidines and Wortmannines through the Excited-State Nazarov Reactions. Org Lett 2021; 23:2736-2741. [PMID: 33760620 DOI: 10.1021/acs.orglett.1c00643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reaction conditions and scope of the excited-state Nazarov reaction of dicyclicvinyl ketones were studied. The stereochemistry of this electrocyclization is consistent with the mechanism of the pericyclic reaction and Woodward-Hoffmann rule. UV-light-promoted excited-state Nazarov reactions gave hydrofluorenones bearing a syn-cis configuration via a disrotatory cyclization. The core tricyclic hydrofluorenones of pyrrocidines and wortmannines were constructed via the excited-state Nazarov reactions, which demonstrated their synthetic potential in complex natural product total synthesis.
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Affiliation(s)
- Dongsheng Xue
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
| | - Yonglei Que
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
| | - Hao Shao
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
| | - Haibing He
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
| | - Xiaoli Zhao
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
| | - Shuanhu Gao
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China.,Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
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4
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Willems T, De Mol ML, De Bruycker A, De Maeseneire SL, Soetaert WK. Alkaloids from Marine Fungi: Promising Antimicrobials. Antibiotics (Basel) 2020; 9:antibiotics9060340. [PMID: 32570899 PMCID: PMC7345139 DOI: 10.3390/antibiotics9060340] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Revised: 06/12/2020] [Accepted: 06/15/2020] [Indexed: 01/20/2023] Open
Abstract
Resistance of pathogenic microorganisms against antimicrobials is a major threat to contemporary human society. It necessitates a perpetual influx of novel antimicrobial compounds. More specifically, Gram− pathogens emerged as the most exigent danger. In our continuing quest to search for novel antimicrobial molecules, alkaloids from marine fungi show great promise. However, current reports of such newly discovered alkaloids are often limited to cytotoxicity studies and, moreover, neglect to discuss the enigma of their biosynthesis. Yet, the latter is often a prerequisite to make them available through sufficiently efficient processes. This review aims to summarize novel alkaloids with promising antimicrobial properties discovered in the past five years and produced by marine fungi. Several discovery strategies are summarized, and knowledge gaps in biochemical production routes are identified. Finally, links between the structure of the newly discovered molecules and their activity are proposed. Since 2015, a total of 35 new antimicrobial alkaloids from marine fungi were identified, of which 22 showed an antibacterial activity against Gram− microorganisms. Eight of them can be classified as narrow-spectrum Gram− antibiotics. Despite this promising ratio of novel alkaloids active against Gram− microorganisms, the number of newly discovered antimicrobial alkaloids is low, due to the narrow spectrum of discovery protocols that are used and the fact that antimicrobial properties of newly discovered alkaloids are barely characterized. Alternatives are proposed in this review. In conclusion, this review summarizes novel findings on antimicrobial alkaloids from marine fungi, shows their potential as promising therapeutic candidates, and hints on how to further improve this potential.
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5
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Ishihara J. Chiral Lewis Acid-template Diels-Alder Reaction and the Application of Natural Product Synthesis. J SYN ORG CHEM JPN 2020. [DOI: 10.5059/yukigoseikyokaishi.78.204] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Jun Ishihara
- Graduate School of Biomedical Sciences, Nagasaki University
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6
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Ishihara J, Usui F, Kurose T, Baba T, Kawaguchi Y, Watanabe Y, Hatakeyama S. Synthetic Studies on Spirolides A and B: Formation of the Upper Carbon Framework Based on a Lewis Acid Template-Catalyzed Diels-Alder Reaction. Chemistry 2018; 25:1543-1552. [DOI: 10.1002/chem.201804977] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Indexed: 11/08/2022]
Affiliation(s)
- Jun Ishihara
- Graduate School of Biomedical Sciences; Nagasaki University; 1-14, Bunkyo-machi Nagasaki 852-8521 Japan
| | - Fuma Usui
- Graduate School of Biomedical Sciences; Nagasaki University; 1-14, Bunkyo-machi Nagasaki 852-8521 Japan
| | - Tomohiro Kurose
- Graduate School of Biomedical Sciences; Nagasaki University; 1-14, Bunkyo-machi Nagasaki 852-8521 Japan
| | - Tomohiro Baba
- Graduate School of Biomedical Sciences; Nagasaki University; 1-14, Bunkyo-machi Nagasaki 852-8521 Japan
| | - Yasunori Kawaguchi
- Graduate School of Biomedical Sciences; Nagasaki University; 1-14, Bunkyo-machi Nagasaki 852-8521 Japan
| | - Yuki Watanabe
- Graduate School of Biomedical Sciences; Nagasaki University; 1-14, Bunkyo-machi Nagasaki 852-8521 Japan
| | - Susumi Hatakeyama
- Medical Innovation Center; Nagasaki University; 1-14, Bunkyo-machi Nagasaki 852-8521 Japan
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7
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Affiliation(s)
- Sukalyan Bhadra
- Inorganic Materials and Catalysis Division, Academy of Scientific and Innovative Research, CSIR-Central Salt and Marine Chemicals Research Institute, G. B. Marg, Bhavnagar, 364002 Gujarat, India
| | - Hisashi Yamamoto
- Molecular Catalyst Research Center, Chubu University, 1200, Matsumoto-Cho, Kasugai, Aichi 487-8501, Japan
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8
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A brief history of antibiotics and select advances in their synthesis. J Antibiot (Tokyo) 2017; 71:153-184. [DOI: 10.1038/ja.2017.62] [Citation(s) in RCA: 77] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Revised: 04/17/2017] [Accepted: 04/23/2017] [Indexed: 12/20/2022]
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9
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Sugata H, Kato R, Tsubogo T, Uchiro H. A Chirality-Returning Sequence for the Synthesis of an Unnatural Isomer of Hirsutellone B. ASIAN J ORG CHEM 2017. [DOI: 10.1002/ajoc.201600610] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Hayato Sugata
- Faculty of Pharmaceutical Sciences; Tokyo University of Science; 2641 Yamazaki Noda Chiba 278-8510 Japan
| | - Ryo Kato
- Faculty of Pharmaceutical Sciences; Tokyo University of Science; 2641 Yamazaki Noda Chiba 278-8510 Japan
| | - Tetsu Tsubogo
- Faculty of Pharmaceutical Sciences; Tokyo University of Science; 2641 Yamazaki Noda Chiba 278-8510 Japan
- Division of Fusion of Regenerative Medicine with DDS; Research Institute for Science and Technology (RIST); Tokyo University of Science; 2641 Yamazaki Noda Chiba 278-8510 Japan
| | - Hiromi Uchiro
- Faculty of Pharmaceutical Sciences; Tokyo University of Science; 2641 Yamazaki Noda Chiba 278-8510 Japan
- Division of Fusion of Regenerative Medicine with DDS; Research Institute for Science and Technology (RIST); Tokyo University of Science; 2641 Yamazaki Noda Chiba 278-8510 Japan
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10
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11
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Liu J, Bedell TA, West JG, Sorensen EJ. Design and Synthesis of Molecular Scaffolds with Anti-infective Activity. Tetrahedron 2016; 72:3579-3592. [PMID: 27284210 PMCID: PMC4894353 DOI: 10.1016/j.tet.2016.01.044] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
| | - T. Aaron Bedell
- Department of Chemistry, Princeton University, Frick Chemical Laboratory, Princeton, New Jersey 08544, USA
| | - Julian G. West
- Department of Chemistry, Princeton University, Frick Chemical Laboratory, Princeton, New Jersey 08544, USA
| | - Erik J. Sorensen
- Department of Chemistry, Princeton University, Frick Chemical Laboratory, Princeton, New Jersey 08544, USA
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12
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Shi Y, Gao S. Recent advances of synthesis of fluorenone and fluorene containing natural products. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.02.022] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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13
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Frihed TG, Fürstner A. Progress in the trans-Reduction and trans-Hydrometalation of Internal Alkynes. Applications to Natural Product Synthesis. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2016. [DOI: 10.1246/bcsj.20150317] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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14
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Yang L, Song L, Huang C, Huang M, Liu B. Exploiting ortho-substitution effect on formation of oxygen-containing [10]paracyclophane through ring-closing metathesis. Org Chem Front 2016. [DOI: 10.1039/c5qo00373c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of strained paracyclophanes is facilitated byortho-substitution effect on phenyl ring.
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Affiliation(s)
- Li Yang
- Key Laboratory of Green Chemistry & Technology of Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
- P. R. China
| | - Liqiang Song
- Key Laboratory of Green Chemistry & Technology of Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
- P. R. China
| | - Chong Huang
- Key Laboratory of Green Chemistry & Technology of Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
- P. R. China
| | - Mingzheng Huang
- Key Laboratory of Green Chemistry & Technology of Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
- P. R. China
| | - Bo Liu
- Key Laboratory of Green Chemistry & Technology of Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
- P. R. China
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15
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Toward the synthesis of hirsutellone B via an intramolecular Diels–Alder/ketene-trapping strategy. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.01.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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16
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Ishihara J, Nakadachi S, Watanabe Y, Hatakeyama S. Lewis Acid Template-Catalyzed Asymmetric Diels–Alder Reaction. J Org Chem 2015; 80:2037-41. [DOI: 10.1021/acs.joc.5b00055] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jun Ishihara
- Graduate School of Biomedical
Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
| | - Shino Nakadachi
- Graduate School of Biomedical
Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
| | - Yuki Watanabe
- Graduate School of Biomedical
Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
| | - Susumi Hatakeyama
- Graduate School of Biomedical
Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
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17
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Tadano KI, Nagai S, Yamagishi Y, Shimizu Y, Takao KI. An Access to the 13-Membered Cyclophane Substructure in GKK1032As: An Intramolecular 1,4-Addition Approach. HETEROCYCLES 2015. [DOI: 10.3987/com-14-s(k)55] [Citation(s) in RCA: 5] [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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18
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Tadano KI. Our recent progress on the intramolecular Diels-Alder reaction approach in natural products synthesis: synthetic studies of the octahydronaphthalene substructure of versipelostatins and the A/B/C-tricyclic substructure of GKK1032s. CHEM REC 2014; 14:623-40. [PMID: 25049071 DOI: 10.1002/tcr.201402008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Indexed: 11/06/2022]
Abstract
During this decade, the enantio- and stereoselective synthesis of natural products has been actively explored in the author's laboratory. In this account, the author outlines practical syntheses of the polycyclic substructures of two novel structurally formidable antibiotics, namely, the trans-fused octahydronaphthalene moiety of versipelostatins and the A/B/C-tricyclic decahydrofluorene moiety of GKK1032s. Both syntheses have been achieved with remarkable regio- and stereoselectivity via intramolecular Diels-Alder reactions using well-designed enantiomeric substrates.
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Affiliation(s)
- Kin-Ichi Tadano
- Department of Applied Chemistry, Keio University, Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan.
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19
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Majumdar KC, Sinha B. Coinage metals (Cu, Ag and Au) in the synthesis of natural products. RSC Adv 2014. [DOI: 10.1039/c3ra44336a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
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20
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Reber KP, Tilley SD, Carson CA, Sorensen EJ. Toward a synthesis of hirsutellone B by the concept of double cyclization. J Org Chem 2013; 78:9584-607. [PMID: 24032341 PMCID: PMC3920480 DOI: 10.1021/jo401799f] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
This account describes a strategy for directly forming three of the six rings found in the polyketide natural product hirsutellone B via a novel cyclization cascade. The key step in our approach comprises two transformations: a large-ring-forming, nucleophilic capture of a transient acylketene and an intramolecular Diels-Alder reaction, both of which occur in tandem through thermolyses of appropriately functionalized, polyunsaturated dioxinones. These thermally induced "double cyclization" cascades generate three new bonds, four contiguous stereocenters, and a significant fraction of the polycyclic architecture of hirsutellone B. The advanced macrolactam and macrolactone intermediates that were synthesized by this process possess key features of the hirsutellone framework, including the stereochemically dense decahydrofluorene core and the strained para-cyclophane ring. However, attempts to complete the carbon skeleton of hirsutellone B via transannular carbon-carbon bond formation were undermined by competitive O-alkylation reactions. This account also documents how we adapted to this undesired outcome through an evaluation of several distinct strategies for synthesis, as well as our eventual achievement of a formal total synthesis of hirsutellone B.
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Affiliation(s)
- Keith P. Reber
- Frick Chemistry Laboratory, Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA
| | - S. David Tilley
- Frick Chemistry Laboratory, Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA
| | - Cheryl A. Carson
- Frick Chemistry Laboratory, Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA
| | - Erik J. Sorensen
- Frick Chemistry Laboratory, Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA
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21
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Li XW, Ear A, Nay B. Hirsutellones and beyond: figuring out the biological and synthetic logics toward chemical complexity in fungal PKS-NRPS compounds. Nat Prod Rep 2013; 30:765-82. [PMID: 23640165 DOI: 10.1039/c3np70016j] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Covering: up to early 2013. Fungal polyketides and their hybrid non ribosomal peptide derivatives are characterized by often striking structural features and biological activities. Their diversity and their complexity arise from highly organized and programmable biosynthetic pathways and have been challenged by many synthetic chemists. This review will conceptually illustrate how complexity can be generated, starting from a general biosynthetic purpose (the fundaments of PKS-NRPS assembly lines) and finally showing how the particular class of hirsutellone compounds has emerged from such processes in relation to post-elongation and secondary tailoring events. Synthetic efforts to produce these natural products will be described with a special emphasis on complexity-generating strategies and steps. Thus, the biosynthetic and synthetic works will be analyzed in a continuous flow, focusing on both the logic of Nature and organic chemists.
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Affiliation(s)
- Xu-Wen Li
- Muséum National d'Histoire Naturelle, Molécules de Communication et Adaptation des Micro-organismes (UMR 7245 CNRS-MNHN), 57 rue Cuvier (CP 54), 75005 Paris, France
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22
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Yu X, Sun D. Macrocyclic drugs and synthetic methodologies toward macrocycles. Molecules 2013; 18:6230-68. [PMID: 23708234 PMCID: PMC4374646 DOI: 10.3390/molecules18066230] [Citation(s) in RCA: 159] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2013] [Revised: 05/15/2013] [Accepted: 05/20/2013] [Indexed: 01/02/2023] Open
Abstract
Macrocyclic scaffolds are commonly found in bioactive natural products and pharmaceutical molecules. So far, a large number of macrocyclic natural products have been isolated and synthesized. The construction of macrocycles is generally considered as a crucial and challenging step in the synthesis of macrocyclic natural products. Over the last several decades, numerous efforts have been undertaken toward the synthesis of complex naturally occurring macrocycles and great progresses have been made to advance the field of total synthesis. The commonly used synthetic methodologies toward macrocyclization include macrolactonization, macrolactamization, transition metal-catalyzed cross coupling, ring-closing metathesis, and click reaction, among others. Selected recent examples of macrocyclic synthesis of natural products and druglike macrocycles with significant biological relevance are highlighted in each class. The primary goal of this review is to summarize currently used macrocyclic drugs, highlight the therapeutic potential of this underexplored drug class and outline the general synthetic methodologies for the synthesis of macrocycles.
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Affiliation(s)
| | - Dianqing Sun
- Department of Pharmaceutical Sciences, The Daniel K. Inouye College of Pharmacy, University of Hawai’i at Hilo, 34 Rainbow Drive, Hilo, HI 96720, USA; E-Mail:
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23
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Tanaka R, Ohishi K, Takanashi N, Nagano T, Suizu H, Suzuki T, Kobayashi S. Synthetic Study of Pyrrocidines: First Entry to the Decahydrofluorene Core of Pyrrocidines. Org Lett 2012; 14:4886-9. [DOI: 10.1021/ol3022116] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ryo Tanaka
- Faculty of Pharmaceutical Sciences, Tokyo University of Science (RIKADAI), 2641Yamazaki, Noda-shi, Chiba 278-8510, Japan
| | - Kentaro Ohishi
- Faculty of Pharmaceutical Sciences, Tokyo University of Science (RIKADAI), 2641Yamazaki, Noda-shi, Chiba 278-8510, Japan
| | - Noriyuki Takanashi
- Faculty of Pharmaceutical Sciences, Tokyo University of Science (RIKADAI), 2641Yamazaki, Noda-shi, Chiba 278-8510, Japan
| | - Tomohiko Nagano
- Faculty of Pharmaceutical Sciences, Tokyo University of Science (RIKADAI), 2641Yamazaki, Noda-shi, Chiba 278-8510, Japan
| | - Hiroshi Suizu
- Faculty of Pharmaceutical Sciences, Tokyo University of Science (RIKADAI), 2641Yamazaki, Noda-shi, Chiba 278-8510, Japan
| | - Takahiro Suzuki
- Faculty of Pharmaceutical Sciences, Tokyo University of Science (RIKADAI), 2641Yamazaki, Noda-shi, Chiba 278-8510, Japan
| | - Susumu Kobayashi
- Faculty of Pharmaceutical Sciences, Tokyo University of Science (RIKADAI), 2641Yamazaki, Noda-shi, Chiba 278-8510, Japan
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24
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Gulder T, Baran PS. Strained cyclophane natural products: Macrocyclization at its limits. Nat Prod Rep 2012; 29:899-934. [DOI: 10.1039/c2np20034a] [Citation(s) in RCA: 102] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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25
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Uchiro H, Kato R, Sakuma Y, Takagi Y, Arai Y, Hasegawa D. Synthetic studies of GKK1032s: the asymmetric synthesis of the decahydrofluorene skeleton via a novel cyclization of silyl enol ether and sequential retro Diels–Alder and intramolecular Diels–Alder reactions. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.09.069] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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26
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Uchiro H, Kato R, Arai Y, Hasegawa M, Kobayakawa Y. Total Synthesis of Hirsutellone B via Ullmann-Type Direct 13-Membered Macrocyclization. Org Lett 2011; 13:6268-71. [DOI: 10.1021/ol202748e] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hiromi Uchiro
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba 278-8510, Japan
| | - Ryo Kato
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba 278-8510, Japan
| | - Yuuki Arai
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba 278-8510, Japan
| | - Miki Hasegawa
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba 278-8510, Japan
| | - Yu Kobayakawa
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba 278-8510, Japan
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27
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Nicolaou KC, Sun YP, Sarlah D, Zhan W, Wu TR. Bioinspired synthesis of hirsutellones A, B, and C. Org Lett 2011; 13:5708-10. [PMID: 21913732 DOI: 10.1021/ol202239u] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The total synthesis of hirsutellones A (1), B (2), and C (3) has been achieved through a bioinspired late-stage sequence starting from advanced intermediate 6. The sequence proceeded via labile intermediate 17,1'-dehydrohirsutellone B (5) and delivered, in addition to the natural products (1-3), hirsutellone analogue 1',2',17-epi-hirsutellone C (1',2',17-epi-3).
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Affiliation(s)
- K C Nicolaou
- Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA.
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