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Nishikawa K, Teranishi T, Tsuruta T, Niwa T, Morita K, Hashimoto S, Hoshino A, Kumagai M, Morimoto Y. Establishment of "Ring-Size-Divergent" Synthetic Strategy: Divergent Synthesis, Stereochemical Assignments, and Biological Activity Studies of Nerolidol-Type Sesquiterpenoids and Feroniellins. J Org Chem 2023; 88:15844-15861. [PMID: 37924303 DOI: 10.1021/acs.joc.3c01913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2023]
Abstract
Biomimetic epoxide-opening cascade cyclizations of polyepoxides enable the efficient and rapid construction of polyether skeletons. In this study, we discovered a method for switching the cyclization mode from tetrahydrofuran to tetrahydropyran (THP) formation in epoxide-opening cascades of polyepoxides. The THP formation proceeded via an epoxonium-ion intermediate by simple heating in neutral water. Next, by expanding the switching reaction, we successfully established a "ring-size-divergent" synthetic strategy that enabled the synthesis of the five-, six-, and seven-membered ether rings from identical diepoxide cyclization precursors under simple acidic or neutral conditions. The "ring-size-divergent" synthetic strategy was applied to the short divergent synthesis of nerolidol-type sesquiterpenoids and feroniellins, resulting in the revision of the proposed stereochemistry of certain natural products and the determination of all of the absolute configurations. Additionally, the anti-inflammatory activities of the synthetic samples were evaluated.
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Affiliation(s)
- Keisuke Nishikawa
- Department of Chemistry, Graduate School of Science, Osaka Metropolitan University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Tomonori Teranishi
- Department of Chemistry, Graduate School of Science, Osaka Metropolitan University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Tomoki Tsuruta
- Department of Chemistry, Graduate School of Science, Osaka Metropolitan University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Toshiki Niwa
- Department of Chemistry, Graduate School of Science, Osaka Metropolitan University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Kengo Morita
- Department of Chemistry, Graduate School of Science, Osaka Metropolitan University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Subaru Hashimoto
- Department of Chemistry, Graduate School of Science, Osaka Metropolitan University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Akihiro Hoshino
- Department of Chemistry, Graduate School of Science, Osaka Metropolitan University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Momochika Kumagai
- Department of Chemistry, Graduate School of Science, Osaka Metropolitan University, Sumiyoshi-ku, Osaka 558-8585, Japan
- Faculty of Fisheries, Kagoshima University, Shimoarata, Kagoshima 890-0056, Japan
| | - Yoshiki Morimoto
- Department of Chemistry, Graduate School of Science, Osaka Metropolitan University, Sumiyoshi-ku, Osaka 558-8585, Japan
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Nishikawa K, Kumagai M, Matsumura K, Nishikibe K, Morimoto Y. Natural Product Synthesis Strategy Based on the Concept of Directly Constructing the Ring Skeletons from Linear Substrates. J SYN ORG CHEM JPN 2021. [DOI: 10.5059/yukigoseikyokaishi.79.197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Keisuke Nishikawa
- Department of Chemistry, Graduate School of Science, Osaka City University
| | | | | | | | - Yoshiki Morimoto
- Department of Chemistry, Graduate School of Science, Osaka City University
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Nishikawa K, Morita K, Hashimoto S, Hoshino A, Ikeuchi T, Kumagai M, Morimoto Y. Critical Switching of Cyclization Modes of Polyepoxides in Acidic Aqueous Media and Neutral Water: Synthesis and Revised Structure of a Nerolidol-Type Sesquiterpenoid. Angew Chem Int Ed Engl 2019; 58:10168-10172. [PMID: 31211481 DOI: 10.1002/anie.201906039] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Indexed: 11/12/2022]
Abstract
Biomimetic epoxide-opening cascades of polyepoxides enable the efficient and rapid construction of polyether frameworks. Herein, we show that the epoxide-opening cascade cyclization that affords tetrahydrofuran products in acidic aqueous media produces tetrahydropyran (THP) in neutral water. THP formation proceeded by simply heating polyepoxides in neutral water and followed a different cyclization mode from those observed so far. The novel cascade cyclization in H2 O was applied to the synthesis of a new nerolidol-type sesquiterpenoid, resulting in revision of the proposed structure and determination of the absolute configuration.
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Affiliation(s)
- Keisuke Nishikawa
- Department of Chemistry, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka, 558-8585, Japan
| | - Kengo Morita
- Department of Chemistry, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka, 558-8585, Japan
| | - Subaru Hashimoto
- Department of Chemistry, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka, 558-8585, Japan
| | - Akihiro Hoshino
- Department of Chemistry, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka, 558-8585, Japan
| | - Takumi Ikeuchi
- Department of Chemistry, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka, 558-8585, Japan
| | - Momochika Kumagai
- Department of Chemistry, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka, 558-8585, Japan.,Japan Food Research Laboratories, Ibaraki-shi, Osaka, 567-0085, Japan
| | - Yoshiki Morimoto
- Department of Chemistry, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka, 558-8585, Japan
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Nishikawa K, Morita K, Hashimoto S, Hoshino A, Ikeuchi T, Kumagai M, Morimoto Y. Critical Switching of Cyclization Modes of Polyepoxides in Acidic Aqueous Media and Neutral Water: Synthesis and Revised Structure of a Nerolidol‐Type Sesquiterpenoid. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201906039] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Keisuke Nishikawa
- Department of ChemistryGraduate School of ScienceOsaka City University Sumiyoshi-ku Osaka 558-8585 Japan
| | - Kengo Morita
- Department of ChemistryGraduate School of ScienceOsaka City University Sumiyoshi-ku Osaka 558-8585 Japan
| | - Subaru Hashimoto
- Department of ChemistryGraduate School of ScienceOsaka City University Sumiyoshi-ku Osaka 558-8585 Japan
| | - Akihiro Hoshino
- Department of ChemistryGraduate School of ScienceOsaka City University Sumiyoshi-ku Osaka 558-8585 Japan
| | - Takumi Ikeuchi
- Department of ChemistryGraduate School of ScienceOsaka City University Sumiyoshi-ku Osaka 558-8585 Japan
| | - Momochika Kumagai
- Department of ChemistryGraduate School of ScienceOsaka City University Sumiyoshi-ku Osaka 558-8585 Japan
- Japan Food Research Laboratories Ibaraki-shi Osaka 567-0085 Japan
| | - Yoshiki Morimoto
- Department of ChemistryGraduate School of ScienceOsaka City University Sumiyoshi-ku Osaka 558-8585 Japan
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Tala MF, Talontsi FM, Zeng GZ, Wabo HK, Spiteller M, Tan NH, Tane P. Phytochemical Analysis of a Cytotoxic Fraction of Quassia silvestris using LC-HR-ESI-MS n. PHYTOCHEMICAL ANALYSIS : PCA 2017; 28:210-216. [PMID: 28028887 DOI: 10.1002/pca.2663] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2016] [Revised: 10/15/2016] [Accepted: 10/24/2016] [Indexed: 06/06/2023]
Abstract
INTRODUCTION The genus Quassia is a promising source of secondary metabolites with biological potential including antimalarial and cytotoxic activities. Limited data are available on the phytochemistry and pharmacology of Quassia silvestris Cheek & Jongkind, a Cameroonian medicinal plant used to treat various ailments. OBJECTIVES To carry out the bioassay-guided fractionation and LC-HR-ESI-MS analyses of the leaves extract from Q. silvestris; to purify the active fractions and isolate the major compounds using different chromatographic and spectroscopic methods. The obtained compounds will be evaluated for their biological activity. MATERIAL AND METHODS Following the cytotoxic screening and LC-HR-ESI-MS profiling of fractions obtained from partition of the methanolic extract of Q. silvestris leaves, the CH2 Cl2 -soluble fraction which exhibited the highest cytotoxicity was retained for further investigations. RESULTS Sixteen squalene-derived metabolites were identified with oxasqualenoid derivatives being the most predominant. Among the isolates, structure elucidation of two new oxasqualenoids quassiols E (1) and F (2), were achieved by NMR (one-dimensional (1D) and two-dimensional (2D)) and MS methods. The newly characterised compounds 1 and 2, together with the known tetraol (3) and 3-oxo-oleanoic acid (16) displayed moderate cytotoxicity. CONCLUSION The identification and structural characterisation of highly oxidised squalene derived metabolites from this plant may provide important insight data for further pharmacological investigations. The LC-HR-ESI-MSn method reported here could be developed as a rapid and efficient tool for the analyses of structurally related compounds in the genera Quassia, Simarouba, and Eurycoma of the subfamily Simarouboideae. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Michel Feussi Tala
- Department of Chemistry, University of Dschang, P.O. Box 67, Dschang, Cameroon
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201, Yunnan, P.R. China
| | - Ferdinand Mouafo Talontsi
- Institute of Environmental Research (INFU) of the Faculty of Chemistry and Chemical Biology, TU Dortmund, Otto-Hahn-Str. 6, D-44221, Dortmund, Germany
| | - Guang-Zhi Zeng
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201, Yunnan, P.R. China
| | | | - Michael Spiteller
- Institute of Environmental Research (INFU) of the Faculty of Chemistry and Chemical Biology, TU Dortmund, Otto-Hahn-Str. 6, D-44221, Dortmund, Germany
| | - Ning-Hua Tan
- Department of Chemistry, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Pierre Tane
- Department of Chemistry, University of Dschang, P.O. Box 67, Dschang, Cameroon
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Adrian J, Gross LJ, Stark CBW. The direct oxidative diene cyclization and related reactions in natural product synthesis. Beilstein J Org Chem 2016; 12:2104-2123. [PMID: 27829917 PMCID: PMC5082725 DOI: 10.3762/bjoc.12.200] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2016] [Accepted: 09/07/2016] [Indexed: 12/17/2022] Open
Abstract
The direct oxidative cyclization of 1,5-dienes is a valuable synthetic method for the (dia)stereoselective preparation of substituted tetrahydrofurans. Closely related reactions start from 5,6-dihydroxy or 5-hydroxyalkenes to generate similar products in a mechanistically analogous manner. After a brief overview on the history of this group of transformations and a survey on mechanistic and stereochemical aspects, this review article provides a summary on applications in natural product synthesis. Moreover, current limitations and future directions in this area of chemistry are discussed.
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Affiliation(s)
- Juliane Adrian
- Fachbereich Chemie, Institut für Organische Chemie, Universität Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany
| | - Leona J Gross
- Fachbereich Chemie, Institut für Organische Chemie, Universität Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany
| | - Christian B W Stark
- Fachbereich Chemie, Institut für Organische Chemie, Universität Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany
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Rehman SU, Choe K, Yoo HH. Review on a Traditional Herbal Medicine, Eurycoma longifolia Jack (Tongkat Ali): Its Traditional Uses, Chemistry, Evidence-Based Pharmacology and Toxicology. Molecules 2016; 21:331. [PMID: 26978330 PMCID: PMC6274257 DOI: 10.3390/molecules21030331] [Citation(s) in RCA: 88] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Revised: 03/02/2016] [Accepted: 03/03/2016] [Indexed: 01/13/2023] Open
Abstract
Eurycoma longifolia Jack (known as tongkat ali), a popular traditional herbal medicine, is a flowering plant of the family Simaroubaceae, native to Indonesia, Malaysia, Vietnam and also Cambodia, Myanmar, Laos and Thailand. E. longifolia, is one of the well-known folk medicines for aphrodisiac effects as well as intermittent fever (malaria) in Asia. Decoctions of E. longifolia leaves are used for washing itches, while its fruits are used in curing dysentery. Its bark is mostly used as a vermifuge, while the taproots are used to treat high blood pressure, and the root bark is used for the treatment of diarrhea and fever. Mostly, the roots extract of E. longifolia are used as folk medicine for sexual dysfunction, aging, malaria, cancer, diabetes, anxiety, aches, constipation, exercise recovery, fever, increased energy, increased strength, leukemia, osteoporosis, stress, syphilis and glandular swelling. The roots are also used as an aphrodisiac, antibiotic, appetite stimulant and health supplement. The plant is reported to be rich in various classes of bioactive compounds such as quassinoids, canthin-6-one alkaloids, β-carboline alkaloids, triterpene tirucallane type, squalene derivatives and biphenyl neolignan, eurycolactone, laurycolactone, and eurycomalactone, and bioactive steroids. Among these phytoconstituents, quassinoids account for a major portion of the E. longifolia root phytochemicals. An acute toxicity study has found that the oral Lethal Dose 50 (LD50) of the alcoholic extract of E. longifolia in mice is between 1500-2000 mg/kg, while the oral LD50 of the aqueous extract form is more than 3000 mg/kg. Liver and renal function tests showed no adverse changes at normal daily dose and chronic use of E. longifolia. Based on established literature on health benefits of E. longifolia, it is important to focus attention on its more active constituents and the constituents' identification, determination, further development and most importantly, the standardization. Besides the available data, more evidence is required regarding its therapeutic efficacy and safety, so it can be considered a rich herbal source of new drug candidates. It is very important to conserve this valuable medicinal plant for the health benefit of future generations.
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Affiliation(s)
- Shaheed Ur Rehman
- Institute of Pharmaceutical Science and Technology and College of Pharmacy, Hanyang University, Ansan, Gyeonggi-do 426-791, Korea.
| | - Kevin Choe
- Institute of Pharmaceutical Science and Technology and College of Pharmacy, Hanyang University, Ansan, Gyeonggi-do 426-791, Korea.
| | - Hye Hyun Yoo
- Institute of Pharmaceutical Science and Technology and College of Pharmacy, Hanyang University, Ansan, Gyeonggi-do 426-791, Korea.
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8
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Sheikh NS. Stereoselective synthesis of trans-THF rings using an oxidative cyclisation-radical deoxygenation sequence: application to the formal synthesis of trans-(2R,5R)-linalool oxide. RSC Adv 2015. [DOI: 10.1039/c4ra13258k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Permanganate-mediated oxidative cyclisation-Barton–McCombie radical deoxygenation sequence is applied to 1,5-dienes to achieve stereoselective synthesis of trans-2,5-disubstituted THF rings.
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Affiliation(s)
- Nadeem S. Sheikh
- Department of Chemistry
- Faculty of Science
- King Faisal University
- Al-Ahsa 31982
- Saudi Arabia
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9
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Suzuki G, Minami A, Shimaya M, Kodama T, Morimoto Y, Oguri H, Oikawa H. Analysis of Enantiofacial Selective Epoxidation Catalyzed by Flavin-containing Monooxygenase Lsd18 Involved in Ionophore Polyether Lasalocid Biosynthesis. CHEM LETT 2014. [DOI: 10.1246/cl.140721] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Gaku Suzuki
- Division of Chemistry, Graduate School of Science, Hokkaido University
| | - Atsushi Minami
- Division of Chemistry, Graduate School of Science, Hokkaido University
| | - Mayu Shimaya
- Division of Chemistry, Graduate School of Science, Hokkaido University
| | - Takeshi Kodama
- Department of Chemistry, Graduate School of Science, Osaka City University
| | - Yoshiki Morimoto
- Department of Chemistry, Graduate School of Science, Osaka City University
| | - Hiroki Oguri
- Division of Chemistry, Graduate School of Science, Hokkaido University
| | - Hideaki Oikawa
- Division of Chemistry, Graduate School of Science, Hokkaido University
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Sheikh NS. Comparative perspective and synthetic applications of transition metal mediated oxidative cyclisation of 1,5-dienes towards cis-2,5-disubstituted tetrahydrofurans. Org Biomol Chem 2014; 12:9492-504. [DOI: 10.1039/c4ob01491j] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Synthesis ofcis-2,5-disubstituted tetrahydrofuran rings from 1,5-diene precursors using metal-oxo species along with their mechanistic proposals and synthetic applications is concisely reviewed.
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Affiliation(s)
- Nadeem S. Sheikh
- Department of Chemistry
- Faculty of Science
- King Faisal University
- Al-Ahsa 31982, Saudi Arabia
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Sheikh NS. Synthetic endeavours towards oxasqualenoid natural products containing 2,5-disubstituted tetrahydrofurans – eurylene and teurilene. Nat Prod Rep 2014; 31:1088-100. [DOI: 10.1039/c4np00029c] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Given the unique structural features of oxasqualenoid natural products and their cytotoxicity, representative examples from oxasqualenoids, eurylene and teurilene have been briefly reviewed. Both compounds possess cis- and trans-2,5-disubstituted tetrahydrofuran rings and represent chiral and achiral facets found in this class of natural products.
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Affiliation(s)
- Nadeem S. Sheikh
- Department of Chemistry
- Faculty of Science
- King Faisal University
- Al-Ahsa 31982, Saudi Arabia
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12
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Rodríguez-López J, Pinacho Crisóstomo F, Ortega N, López-Rodríguez M, Martín VS, Martín T. Epoxide-Opening Cascades Triggered by a Nicholas Reaction: Total Synthesis of Teurilene. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201209159] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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13
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Rodríguez-López J, Pinacho Crisóstomo F, Ortega N, López-Rodríguez M, Martín VS, Martín T. Epoxide-opening cascades triggered by a Nicholas reaction: total synthesis of teurilene. Angew Chem Int Ed Engl 2013; 52:3659-62. [PMID: 23436322 DOI: 10.1002/anie.201209159] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2012] [Revised: 12/29/2012] [Indexed: 11/10/2022]
Affiliation(s)
- Julio Rodríguez-López
- Instituto Universitario de Bio-Orgánica Antonio González, Universidad de La Laguna, Francisco Sánchez, 2, 38206 La Laguna, Tenerife, Spain
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Piccialli V, Zaccaria S, Oliviero G, D'Errico S, D'Atri V, Borbone N. Insight into Pyridinium Chlorochromate Chemistry: Catalytic Oxidation of Tetrahydrofuran Compounds and Synthesis of Umbelactone. European J Org Chem 2012. [DOI: 10.1002/ejoc.201200069] [Citation(s) in RCA: 10] [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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15
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Morimoto Y. Total Synthesis of Marine Halogen-Containing Triterpene Polyethers Using Regioselective 5- exo and 6- endo Cyclizations and the Stereochemistry. J SYN ORG CHEM JPN 2012. [DOI: 10.5059/yukigoseikyokaishi.70.154] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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16
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Piccialli V, Zaccaria S, Borbone N, Oliviero G, D'Errico S, Hemminki A, Cerullo V, Romano V, Tuzi A, Centore R. Discovery of a novel one-step RuO4-catalysed tandem oxidative polycyclization/double spiroketalization process. Access to a new type of polyether bis-spiroketal compound displaying antitumour activity. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.10.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Xiong Z, Busch R, Corey EJ. A short total synthesis of (+)-omaezakianol via an epoxide-initiated cationic cascade reaction. Org Lett 2010; 12:1512-4. [PMID: 20218639 DOI: 10.1021/ol100213e] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
(+)-Omaezakianol was synthesized in only three steps from racemic chlorohydrin 4 by Shi epoxidation followed by cascade cyclization and reduction.
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Affiliation(s)
- Zhaoming Xiong
- Department of Medicinal Chemistry, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Ridgebury Road, Ridgefield, Connecticut 06877, USA.
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18
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Piccialli V, Oliviero G, Borbone N, Tuzi A, Centore R, Hemminki A, Ugolini M, Cerullo V. Discovery of a new PCC-mediated stereoselective oxidative spiroketalization process. An access to a new type of poly-THF spiroketal compound displaying anticancer activity. Org Biomol Chem 2009. [DOI: 10.1039/b906872d] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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RuO4-catalyzed oxidative polycyclization of the Cs-symmetric isoprenoid polyene digeranyl. An unexpected stereochemical outcome. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.09.052] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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20
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Morimoto Y. The role of chemical synthesis in structure elucidation of oxasqualenoids. Org Biomol Chem 2008; 6:1709-19. [DOI: 10.1039/b801126e] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Morimoto Y, Nishikawa Y, Ueba C, Tanaka T. Reagent-Controlled Switching of 5-exo to 6-endo Cyclizations in Epoxide Openings. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200503143] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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22
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Morimoto Y, Nishikawa Y, Ueba C, Tanaka T. Reagent-Controlled Switching of 5-exo to 6-endo Cyclizations in Epoxide Openings. Angew Chem Int Ed Engl 2006; 45:810-2. [PMID: 16355433 DOI: 10.1002/anie.200503143] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yoshiki Morimoto
- Department of Chemistry, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan.
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Caserta T, Piccialli V, Gomez-Paloma L, Bifulco G. RuO4-catalyzed oxidative polycyclization of squalene. Determination of the configuration of the penta-tetrahydrofuranyl diol product. Tetrahedron 2005. [DOI: 10.1016/j.tet.2004.11.018] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Morimoto Y, Iwai T, Nishikawa Y, Kinoshita T. Stereospecific and biomimetic synthesis of CS and C2 symmetric 2,5-disubstituted tetrahydrofuran rings as central building blocks of biogenetically intriguing oxasqualenoids. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s0957-4166(02)00718-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Morimoto Y, Takaishi M, Iwai T, Kinoshita T, Jacobs H. Complete assignment of the stereostructure of a new squalene-derived epoxy tri-THF diol from Spathelia glabrescens by total synthesis. Tetrahedron Lett 2002. [DOI: 10.1016/s0040-4039(02)01167-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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27
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Morimoto Y, Kinoshita T, Iwai T. Asymmetric total synthesis of highly symmetric squalene-derived cytotoxic polyethers. Chirality 2002; 14:578-86. [PMID: 12112332 DOI: 10.1002/chir.10083] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The efficient total synthesis of the cytotoxic meso polyether teurilene (1), rarely occurring in nature, was achieved through the effective combination of the concept of two-directional synthesis and rhenium(VII) chemistry. In the key rhenium(VII)-promoted syn oxidative cyclization reaction of the two-directional substrate 16, trans-syn diastereoselectivity (steric control) has been observed in contrast to our early observation of cis-syn diastereoselectivities (chelation control) for bishomoallylic tertiary alcohols 24-27 possessing the neighboring tetrahydrofuran (THF) ring. This synthesis in only 10 steps from commercially available methyl tiglate is significantly shorter than the previous one requiring 25 steps. The total syntheses of four possible C(s) symmetric (3 and 47-49) and one C2 symmetric (4) compounds for biogenetically squalene-derived pentaTHF polyether, glabrescol, was also achieved in relatively few steps by taking advantage of its intrinsic symmetry and one- and two-directional modes of double THF ring formations with vanadium catalyst, tert-butyl hydroperoxide (TBHP), and trifluoroacetic acid (TFA). Thus, the meso structure 3 originally proposed by Jacobs et al. has been revised to the optically pure C2 symmetric structure 4 through its enantioselective total synthesis.
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Affiliation(s)
- Yoshiki Morimoto
- Department of Chemistry, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan.
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Harding WW, Simpson DS, Jacobs H, McLean S, Reynolds WF. A new squalene-derived epoxy tri-THF diol from Spathelia glabrescens. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(01)01578-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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29
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30
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31
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Hioki H, Kanehara C, Ohnishi Y, Umemori Y, Sakai H, Yoshio S, Matsushita M, Kodama M. What Is the Structure of Glabrescol? Stereoselective Synthesis of Reported Glabrescol. Angew Chem Int Ed Engl 2000. [DOI: 10.1002/1521-3757(20000717)112:14<2652::aid-ange2652>3.0.co;2-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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32
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Le Huérou Y, Doyon J, Grée RL. Stereocontrolled Synthesis of Key Advanced Intermediates toward Simplified Acetogenin Analogues. J Org Chem 1999; 64:6782-6790. [PMID: 11674687 DOI: 10.1021/jo990772h] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The stereo- and enantiocontrolled synthesis of substituted beta-hydroxy ethers based on glycol and catechol bearing an alkyne group and a series of substituents is reported. These substrates were designed to mimic the bis-THF array of annonaceous acetogenins and to provide an access to simplified and modified analogues. The key steps of the synthesis involve the condensation of the nonracemic mesylate of solketal with ethylene glycol and catechol, followed by an alkylation with a glycidyl derivative. Under appropriate conditions, the reaction is completely stereoselective and allows the synthesis of all the diastereomers. After the epoxide was opened with triethylsilylacetylene, the second epoxide was unmasked and reacted with a series of alkyl, aryl, amine, and alcohol reagents. A series of 28 analogues was prepared having a glycol or a catechol core, a stereodefined configuration of the flanking hydroxyl groups, and an acetylenic appendage suitable for a coupling to a lactone-bearing fragment.
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Affiliation(s)
- Yvan Le Huérou
- Laboratoire de Synthèses et d'Activations de Biomolécules, CNRS, ESA 6052, ENSCR, Avenue du Général Leclerc, 35700 Rennes-Beaulieu, France
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