1
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White AM, Dao K, Vrubliauskas D, Könst ZA, Pierens GK, Mándi A, Andrews KT, Skinner-Adams TS, Clarke ME, Narbutas PT, Sim DCM, Cheney KL, Kurtán T, Garson MJ, Vanderwal CD. Catalyst-Controlled Stereoselective Synthesis Secures the Structure of the Antimalarial Isocyanoterpene Pustulosaisonitrile-1. J Org Chem 2017; 82:13313-13323. [DOI: 10.1021/acs.joc.7b02421] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Andrew M. White
- School
of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Kathy Dao
- 1102
Natural Sciences II, Department of Chemistry, University of California, Irvine, California 92697-2025, United States
| | - Darius Vrubliauskas
- 1102
Natural Sciences II, Department of Chemistry, University of California, Irvine, California 92697-2025, United States
| | - Zef A. Könst
- 1102
Natural Sciences II, Department of Chemistry, University of California, Irvine, California 92697-2025, United States
| | - Gregory K. Pierens
- Centre
for Advanced Imaging, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Attila Mándi
- Department
of Organic Chemistry, University of Debrecen, Debrecen, Hungary
| | - Katherine T. Andrews
- Griffith
Institute for Drug Discovery, Griffith University, Nathan, QLD 4111, Australia
| | - Tina S. Skinner-Adams
- Griffith
Institute for Drug Discovery, Griffith University, Nathan, QLD 4111, Australia
| | - Mary E. Clarke
- Griffith
Institute for Drug Discovery, Griffith University, Nathan, QLD 4111, Australia
| | - Patrick T. Narbutas
- School
of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Desmond C.-M. Sim
- School
of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Karen L. Cheney
- School
of Biological Sciences, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Tibor Kurtán
- Department
of Organic Chemistry, University of Debrecen, Debrecen, Hungary
| | - Mary J. Garson
- School
of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Christopher D. Vanderwal
- 1102
Natural Sciences II, Department of Chemistry, University of California, Irvine, California 92697-2025, United States
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2
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Sim DCM, Wayan Mudianta I, White AM, Martiningsih NW, Loh JJM, Cheney KL, Garson MJ. New sesquiterpenoid isonitriles from three species of phyllidid nudibranchs. Fitoterapia 2017; 126:69-73. [PMID: 29031559 DOI: 10.1016/j.fitote.2017.10.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Revised: 10/03/2017] [Accepted: 10/03/2017] [Indexed: 11/15/2022]
Abstract
Chemical investigation of the two nudibranch species Phyllidiella pustulosa and Phyllidia ocellata collected in Queensland, Australia, provided new stereoisomers of 4-isocyano-9-amorphene (1) and of 10-isocyano-4-amorphene (2), respectively. A specimen of Phyllidia picta collected from Bali, Indonesia, contained the axane sesquiterpenoids pictaisonitrile-1 (3) and pictaisonitrile-2 (4). The planar structures were elucidated using 1D and 2D NMR spectroscopy, while relative configurations were established using NOESY correlations, coupling constant data, and comparison with literature data.
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Affiliation(s)
- Desmond C-M Sim
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia.
| | - I Wayan Mudianta
- Study Program of Chemical Analysis, Universitas Pendidikan Ganesha, Bali, 81116, Indonesia.
| | - Andrew M White
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia.
| | - Ni Wayan Martiningsih
- Study Program of Chemical Analysis, Universitas Pendidikan Ganesha, Bali, 81116, Indonesia.
| | - Jasmine J M Loh
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia.
| | - Karen L Cheney
- School of Biological Sciences, The University of Queensland, Brisbane, QLD 4072, Australia.
| | - Mary J Garson
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia.
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3
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Daub ME, Prudhomme J, Ben Mamoun C, Le Roch KG, Vanderwal CD. Antimalarial Properties of Simplified Kalihinol Analogues. ACS Med Chem Lett 2017; 8:355-360. [PMID: 28337330 PMCID: PMC5346982 DOI: 10.1021/acsmedchemlett.7b00013] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2017] [Accepted: 02/16/2017] [Indexed: 11/29/2022] Open
Abstract
Several kalihinol natural products, members of the broader isocyanoterpene family of antimalarial agents, are potent inhibitors of Plasmodium falciparum, the agent of the most severe form of human malaria. Our previous total synthesis of kalihinol B provided a blueprint to generate many analogues within this family, some as complex as the natural product and some much simplified and easier to access. Each analogue was tested for blood-stage antimalarial activity using both drug-sensitive and -resistant P. falciparum strains. Many considerably simpler analogues of the kalihinols retained potent activity, as did a compound with a different decalin scaffold made in only three steps from sclareolide. Finally, one representative compound showed reasonable stability toward microsomal metabolism, suggesting that the isonitrile functional group that is critical for activity is not an inherent liability in these compounds.
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Affiliation(s)
- Mary Elisabeth Daub
- Department
of Chemistry, University of California, 1102 Natural Sciences II, Irvine, California 92697, United States
| | - Jacques Prudhomme
- Department of Cell Biology & Neuroscience, University of California, 900 University Avenue, Riverside, California 92521, United States
| | - Choukri Ben Mamoun
- Department
of Internal Medicine, Section of Infectious Diseases, Yale School of Medicine, New Haven, Connecticut 06520, United States
| | - Karine G. Le Roch
- Department of Cell Biology & Neuroscience, University of California, 900 University Avenue, Riverside, California 92521, United States
| | - Christopher D. Vanderwal
- Department
of Chemistry, University of California, 1102 Natural Sciences II, Irvine, California 92697, United States
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4
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Prawat H, Mahidol C, Kaweetripob W, Prachyawarakorn V, Tuntiwachwuttikul P, Ruchirawat S. Sesquiterpene isocyanides, isothiocyanates, thiocyanates, and formamides from the Thai sponge Halichondria sp. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.05.060] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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5
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Roosen PC, Vanderwal CD. A Formal Enantiospecific Synthesis of 7,20-Diisocyanoadociane. Angew Chem Int Ed Engl 2016; 55:7180-3. [PMID: 27162155 DOI: 10.1002/anie.201603581] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Indexed: 11/11/2022]
Abstract
7,20-Diisocyanoadociane (DICA) is a potent antimalarial isocyanoterpene endowed with a fascinating tetracyclic structure composed of fused chair cyclohexanes. We report a highly stereocontrolled synthesis of a late-stage intermediate, the "Corey dione", from which DICA has been made previously. This formal synthesis features a rapid buildup of much of the complexity of the target through a sequence of enone tandem vicinal difunctionalization, Friedel-Crafts cyclodehydration, and sequential stereocontrolled reductions. Most importantly, this success establishes the broader feasibility of our previously developed general synthesis approach to the isocyanoterpene family and provides a blueprint for a very direct synthesis of DICA and related natural products.
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Affiliation(s)
- Philipp C Roosen
- Department of Chemistry, 1102 Natural Sciences II, University of California, Irvine, Irvine, CA, 92697-2025, USA
| | - Christopher D Vanderwal
- Department of Chemistry, 1102 Natural Sciences II, University of California, Irvine, Irvine, CA, 92697-2025, USA.
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6
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Roosen PC, Vanderwal CD. A Formal Enantiospecific Synthesis of 7,20-Diisocyanoadociane. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201603581] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Philipp C. Roosen
- Department of Chemistry; 1102 Natural Sciences II; University of California, Irvine; Irvine CA 92697-2025 USA
| | - Christopher D. Vanderwal
- Department of Chemistry; 1102 Natural Sciences II; University of California, Irvine; Irvine CA 92697-2025 USA
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7
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Emsermann J, Kauhl U, Opatz T. Marine Isonitriles and Their Related Compounds. Mar Drugs 2016; 14:16. [PMID: 26784208 PMCID: PMC4728513 DOI: 10.3390/md14010016] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Revised: 12/16/2015] [Accepted: 12/23/2015] [Indexed: 11/16/2022] Open
Abstract
Marine isonitriles represent the largest group of natural products carrying the remarkable isocyanide moiety. Together with marine isothiocyanates and formamides, which originate from the same biosynthetic pathways, they offer diverse biological activities and in spite of their exotic nature they may constitute potential lead structures for pharmaceutical development. Among other biological activities, several marine isonitriles show antimalarial, antitubercular, antifouling and antiplasmodial effects. In contrast to terrestrial isonitriles, which are mostly derived from α-amino acids, the vast majority of marine representatives are of terpenoid origin. An overview of all known marine isonitriles and their congeners will be given and their biological and chemical aspects will be discussed.
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Affiliation(s)
- Jens Emsermann
- Institute of Organic Chemistry, Johannes Gutenberg-University Mainz, Duesbergweg 10-14, 55128 Mainz, Germany.
| | - Ulrich Kauhl
- Institute of Organic Chemistry, Johannes Gutenberg-University Mainz, Duesbergweg 10-14, 55128 Mainz, Germany.
| | - Till Opatz
- Institute of Organic Chemistry, Johannes Gutenberg-University Mainz, Duesbergweg 10-14, 55128 Mainz, Germany.
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8
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Affiliation(s)
- Taiki Umezawa
- Faculty of Environmental Earth Science, Hokkaido University
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9
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Ichikawa Y, Yamauchi E, Isobe M. Allyl Cyanate-to-isocyanate Rearrangement for the Synthesis of Quaternary Stereocenter with Nitrogen Substituent. Biosci Biotechnol Biochem 2014; 69:939-43. [PMID: 15914913 DOI: 10.1271/bbb.69.939] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The stereochemistry and efficiency of an allyl cyanate-to-isocyanate rearrangement for the construction of quaternary stereocenter with nitrogen substituent was investigated by the synthesis of (R)-alpha-methylphenylalanine. The rearrangement was found to be stereospecific, and the chirality of allyl carbamate was transferred to that of the quaternary carbon bearing isocyanate group. These results establish that an allyl cyanate-to-isocyanate rearrangement is a useful method for the synthesis of natural products, that contain the quaternary carbon with nitrogen substituent.
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Affiliation(s)
- Yoshiyasu Ichikawa
- Laboratory of Natural Products, Faculty of Science, Kochi University, Kochi.
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10
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Nishikawa K, Umezawa T, Garson MJ, Matsuda F. Confirmation of the configuration of 10-isothiocyanato-4-cadinene diastereomers through synthesis. JOURNAL OF NATURAL PRODUCTS 2012; 75:2232-2235. [PMID: 23163354 DOI: 10.1021/np300439e] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The marine sponge metabolite 10-isothiocyanato-4-cadinene (1) was first isolated by Garson et al. from Acanthella cavernosa in 2000. The same structure 1 was later reported by Wright et al. from the nudibranch Phyllidiella pustulosa and its sponge diet, but with different NMR data. The syntheses of both enantiomers of 1 were accomplished through the isothiocyanation of 10-isocyano-4-cadinene (2) previously synthesized by our group. The correct spectroscopic data and specific rotation value of the structure 1 were determined on the basis of the syntheses. The NMR data of synthetic 1 matched those of the isothiocyanate isolated by Garson and differed from those reported by Wright. The spectroscopic data and specific rotation values of 10-epi-10-isothiocyanato-4-cadinene (6) and di-1,6-epi-10-isothiocyanato-4-cadinene (8) were also established through the syntheses of these diastereomers. Structure 6 has been reported as a natural product by Mitome et al., but the NMR data for the synthetic sample of 6 differ from those of the natural isolate.
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Affiliation(s)
- Keisuke Nishikawa
- Division of Environmental Materials Science, Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan
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11
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Ichikawa Y, Matsuda Y, Okumura K, Nakamura M, Masuda T, Kotsuki H, Nakano K. Asymmetric synthesis of (+)-geranyllinaloisocyanide: assignment of absolute stereochemistry. Org Lett 2011; 13:2520-3. [PMID: 21491897 DOI: 10.1021/ol200308m] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The first nonracemic synthesis of (+)-geranyllinaloisocyanide, starting with (-)-lactic acid methyl ester, has been accomplished by exploiting a [3.3] sigmatropic rearrangement of allyl cyanate. The synthesis enables assignment of the S configuration of the C(3) isocyano substituted, quaternary stereogenic center in natural geranyllinaloisocyanide.
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12
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13
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Jumaryatno P, Stapleton BL, Hooper JNA, Brecknell DJ, Blanchfield JT, Garson MJ. A comparison of sesquiterpene scaffolds across different populations of the tropical marine sponge Acanthella cavernosa. JOURNAL OF NATURAL PRODUCTS 2007; 70:1725-1730. [PMID: 17953446 DOI: 10.1021/np070156d] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Specimens of the Indo-Pacific sponge Acanthella cavernosa Dendy collected from locations along the Eastern coastline of Australia have been shown to contain a range of sesquiterpenes including isothiocyanate 1, isocyanide 10, and the isocyanates 15 and 22. These metabolite studies have provided a basis for chemical comparisons between sponge populations from different geographic locations and between individual specimens collected from a single location.
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Affiliation(s)
- Pinus Jumaryatno
- School of Molecular and Microbial Sciences, The University of Queensland, Brisbane QLD 4072, Australia
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14
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Fischer DF, Xin ZQ, Peters R. Asymmetric Formation of Allylic Amines with N-Substituted Quaternary Stereocenters by PdII-Catalyzed Aza-Claisen Rearrangements. Angew Chem Int Ed Engl 2007; 46:7704-7. [PMID: 17722138 DOI: 10.1002/anie.200702086] [Citation(s) in RCA: 106] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Daniel F Fischer
- Laboratory of Organic Chemistry, ETH Zürich, Wolfgang-Pauli-Strasse 10, Hönggerberg HCI E 111, 8093 Zürich, Switzerland
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15
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Fischer D, Xin ZQ, Peters R. Asymmetrische Synthese von Allylaminen mit N-substituierten quartären Stereozentren durch Palladium(II)-katalysierte Aza-Claisen-Umlagerungen. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200702086] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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16
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17
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18
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Uy MM, Ohta S, Yanai M, Ohta E, Hirata T, Ikegami S. New spirocyclic sesquiterpenes from the marine sponge Geodia exigua. Tetrahedron 2003. [DOI: 10.1016/s0040-4020(02)01619-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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19
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Chang CW. Naturally occurring isocyano/isothiocyanato and related compounds. FORTSCHRITTE DER CHEMIE ORGANISCHER NATURSTOFFE = PROGRESS IN THE CHEMISTRY OF ORGANIC NATURAL PRODUCTS. PROGRES DANS LA CHIMIE DES SUBSTANCES ORGANIQUES NATURELLES 2001; 80:1-186. [PMID: 11036790 DOI: 10.1007/978-3-7091-6331-3_1] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Affiliation(s)
- C W Chang
- Department of Chemistry, University of West Florida, Pensacola, USA
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20
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New Isocyano and Isothiocyanato Terpene Metabolites from the Tropical Marine Sponge Acanthella cavernosa. Tetrahedron 2000. [DOI: 10.1016/s0040-4020(00)00226-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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21
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Garson[xc*] M, Simpson J, Flowers A, Dumdei E. Cyanide and thiocyanate-derived functionality in marine organisms - structures, biosynthesis and ecology. ACTA ACUST UNITED AC 2000. [DOI: 10.1016/s1572-5995(00)80010-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
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22
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Okino T, Yoshimura E, Hirota H, Fusetani N. New antifouling sesquiterpenes from four nudibranchs of the family Phyllidiidae. Tetrahedron 1996. [DOI: 10.1016/0040-4020(96)00481-4] [Citation(s) in RCA: 88] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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23
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24
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Guevel AC, Hart DJ. Synthesis of Carbocycles via Intramolecular Conjugate Additions: Total Syntheses of Axane Sesquiterpenoids. J Org Chem 1996; 61:473-479. [PMID: 11666963 DOI: 10.1021/jo951532e] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Syntheses of (+/-)-axamide-1 (2) and (+/-)-axisonitrile-1 (1) are described. The syntheses require 12 steps and 13 steps, respectively, from vinylogous ester 8 and feature the diastereoselective cyclization of unsaturated ester 7 to perhydroindan 5. Some interesting reactions of the organometallic derived from [(trimethylsilyl)methyl]magnesium chloride and cerium trichloride are also described.
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Affiliation(s)
- Alyx-Caroline Guevel
- Department of Chemistry, The Ohio State University, 120 W. 18th Avenue, Columbus, Ohio 43210
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25
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26
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Braekman JC, Daloze D, Stoller C, Van Soest RW. Chemotaxonomy of Agelas (Porifera: Demospongiae). BIOCHEM SYST ECOL 1992. [DOI: 10.1016/0305-1978(92)90082-o] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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27
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Wolber EKA, Schmittel M, Rüchardt C. Neue Synthesen für isomerenreine Allyl- und Propargylcyanide durch Isocyanid-Cyanid-Umlagerung[1]. ACTA ACUST UNITED AC 1992. [DOI: 10.1002/cber.19921250233] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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28
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29
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30
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Omar S, Tenenbaum L, Manes LV, Crews P. Novel marine sponge derived amino acids 7. The fenestins. Tetrahedron Lett 1988. [DOI: 10.1016/s0040-4039(00)80794-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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31
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32
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Antimicrobial and antineoplastic tyrosine metabolites from a marine sponge,Aplysina fistularis. Arch Pharm Res 1985. [DOI: 10.1007/bf02897562] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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33
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Novel bisabolene-type sesquiterpenoids with a conjugated diene isolated from the okinawan sea sponge theonella cf. swinhoei. Tetrahedron Lett 1984. [DOI: 10.1016/s0040-4039(01)91295-x] [Citation(s) in RCA: 35] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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34
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35
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Ollis W, Rey M, Godtfredsen WO, Rastrup-Andersen N, Vangedal S, King TJ. The constitution of the antibiotic trichoviridin. Tetrahedron 1980. [DOI: 10.1016/0040-4020(80)80027-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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36
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Hagadone MR, Burreson BJ, Scheuer PJ, Finer JS, Clardy J. Defense Allomones of the NudibranchPhyllidia varicosa Lamarck 1801. Helv Chim Acta 1979. [DOI: 10.1002/hlca.19790620742] [Citation(s) in RCA: 75] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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37
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Wratten SJ, Faulkner D, Hirotsu K, Clardy J. Diterpenoid isocyanides from the marine sponge hymeniacidon amphilecta. Tetrahedron Lett 1978. [DOI: 10.1016/s0040-4039(01)95220-7] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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38
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