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Hashimoto T, Shimazaki Y, Omatsu Y, Maruoka K. Indanol-Based Chiral Organoiodine Catalysts for Enantioselective Hydrative Dearomatization. Angew Chem Int Ed Engl 2018; 57:7200-7204. [PMID: 29700910 DOI: 10.1002/anie.201803889] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2018] [Revised: 04/26/2018] [Indexed: 01/09/2023]
Abstract
Rapid development in the last decade has rendered chiral organoiodine(I/III) catalysis a reliable methodology in asymmetric catalysis. However, due to the severely limited numbers of effective organoiodine catalysts, many reactions still give low to modest enantioselectivity. We report herein a solution to this issue through the introduction of a pivotal indanol scaffold to the catalyst design. Our catalyst architecture exhibits the advantage of high modularity and thereby expedites catalyst optimization. The catalyst was optimized for the challenging and highly sought-after hydrative dearomatization of 2-substituted phenols at the 4-position.
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Affiliation(s)
- Takuya Hashimoto
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto, 606-8502, Japan.,Department of Chemistry, Graduate School of Science, Chiba University, 1-33, Yayoi, Inage, Chiba, 263-8522, Japan.,Chiba Iodine Resource Innovation Center, 1-33, Yayoi, Inage, Chiba, 263-8522, Japan
| | - Yuto Shimazaki
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto, 606-8502, Japan
| | - Yamato Omatsu
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto, 606-8502, Japan
| | - Keiji Maruoka
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto, 606-8502, Japan.,School of Chemical Engineering and Light Industry, Guangdong University of Technology, Panyu District, Guangzhou, 510006, China
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Hashimoto T, Shimazaki Y, Omatsu Y, Maruoka K. Indanol-Based Chiral Organoiodine Catalysts for Enantioselective Hydrative Dearomatization. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201803889] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Takuya Hashimoto
- Department of Chemistry; Graduate School of Science; Kyoto University; Sakyo Kyoto 606-8502 Japan
- Department of Chemistry; Graduate School of Science; Chiba University; 1-33, Yayoi, Inage Chiba 263-8522 Japan
- Chiba Iodine Resource Innovation Center; 1-33, Yayoi, Inage Chiba 263-8522 Japan
| | - Yuto Shimazaki
- Department of Chemistry; Graduate School of Science; Kyoto University; Sakyo Kyoto 606-8502 Japan
| | - Yamato Omatsu
- Department of Chemistry; Graduate School of Science; Kyoto University; Sakyo Kyoto 606-8502 Japan
| | - Keiji Maruoka
- Department of Chemistry; Graduate School of Science; Kyoto University; Sakyo Kyoto 606-8502 Japan
- School of Chemical Engineering and Light Industry; Guangdong University of Technology; Panyu District Guangzhou 510006 China
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Yakura T, Nambu H, Fujiwara T. Development of Novel Catalytic System, Iodoarene-Oxone<sup>®</sup>, on Hypervalent Iodine Oxidation of Phenols and Alcohols. J SYN ORG CHEM JPN 2017. [DOI: 10.5059/yukigoseikyokaishi.75.209] [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)
- Takayuki Yakura
- Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama
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Feldman AW, Ovaska SI, Ovaska TV. Facile Access to Cyclooctanoid Ring Systems via Microwave-Assisted Tandem 6-exo dig Cyclization-Rearrangement Sequence. Tetrahedron 2014; 70:4147-4155. [PMID: 24994941 DOI: 10.1016/j.tet.2014.02.089] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Appropriately substituted 5-alkyn-1-ol systems bearing a nitrile moiety at the triple bond serve as versatile precursors to a variety of cyclooctenone derivatives via a "one-pot" base-catalyzed oxyanionic 6-exo dig cyclization/Claisen rearrangement sequence under microwave irradiation. It was found that the initially formed cyclic intermediate consists of a mixture of endo and exocyclic isomers, which appear to be in equilibrium under the reaction conditions. However, the only observed products from these reactions are α-cyano substituted cyclooctenones, derived from the exocyclic dihydrofuran intermediates.
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Affiliation(s)
- Aaron W Feldman
- Department of Chemistry, Connecticut College, 270 Mohegan Avenue, New London, Connecticut 06320, United States of America
| | - Sami I Ovaska
- Department of Chemistry, Connecticut College, 270 Mohegan Avenue, New London, Connecticut 06320, United States of America
| | - Timo V Ovaska
- Department of Chemistry, Connecticut College, 270 Mohegan Avenue, New London, Connecticut 06320, United States of America
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Skropeta D, Pastro N, Zivanovic A. Kinase inhibitors from marine sponges. Mar Drugs 2011; 9:2131-2154. [PMID: 22073013 PMCID: PMC3210622 DOI: 10.3390/md9102131] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2011] [Revised: 10/01/2011] [Accepted: 10/14/2011] [Indexed: 01/08/2023] Open
Abstract
Protein kinases play a critical role in cell regulation and their deregulation is a contributing factor in an increasing list of diseases including cancer. Marine sponges have yielded over 70 novel compounds to date that exhibit significant inhibitory activity towards a range of protein kinases. These compounds, which belong to diverse structural classes, are reviewed herein, and ordered based upon the kinase that they inhibit. Relevant synthetic studies on the marine natural product kinase inhibitors have also been included.
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Affiliation(s)
- Danielle Skropeta
- School of Chemistry, University of Wollongong, Wollongong, NSW 2522, Australia; E-Mails: (N.P.); (A.Z.)
- Centre for Medicinal Chemistry, University of Wollongong, Wollongong, NSW 2522, Australia
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +61-2-42214360; Fax: +61-2-42214287
| | - Natalie Pastro
- School of Chemistry, University of Wollongong, Wollongong, NSW 2522, Australia; E-Mails: (N.P.); (A.Z.)
| | - Ana Zivanovic
- School of Chemistry, University of Wollongong, Wollongong, NSW 2522, Australia; E-Mails: (N.P.); (A.Z.)
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Lee DW, Pandey RK, Lindeman S, Donaldson WA. Reactivity of acyclic (pentadienyl)iron(1+) cations: Synthetic studies directed toward the frondosins. Org Biomol Chem 2011; 9:7742-7. [DOI: 10.1039/c1ob05720k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Reiter M, Torssell S, Lee S, Macmillan DWC. The organocatalytic three-step total synthesis of (+)-frondosin B. Chem Sci 2010; 1:37-42. [PMID: 22299067 DOI: 10.1039/c0sc00204f] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The frondosins are a family of marine sesquiterpenes isolated from the sponge Dysidea frondosa that exhibit biological activities ranging from anti-inflammatory properties to potential application in anticancer and HIV therapy. Herein, a concise enantioselective total synthesis of (+)-frondosin B is described which requires a total of three chemical steps. The enantioselective conjugate addition of a benzofuran-derived boronic acid to crotonaldehyde in the presence of an imidazolidinone organocatalyst builds the critical stereogenic center of frondosin B in the first operation, while the remaining two ring systems of this natural product are installed in the two subsequent steps. A combination of X-ray crystallographic data, deuterium labeling, and chemical correlation studies provides further evidence as to the correct absolute stereochemical assignment of (+)-frondosin B.
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Affiliation(s)
- Maud Reiter
- Merck Center for Catalysis at Princeton University, Princeton, New Jersey, 08544, USA
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Masters KS, Flynn BL. An efficient synthesis of (±)-frondosin B using a Stille–Heck reaction sequence. Org Biomol Chem 2010; 8:1290-2. [DOI: 10.1039/b924542a] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Ovaska TV, Sullivan JA, Ovaska SI, Winegrad JB, Fair JD. Asymmetric synthesis of seven-membered carbocyclic rings via a sequential oxyanionic 5-exo-dig cyclization/claisen rearrangement process. Total synthesis of (-)-frondosin B. Org Lett 2009; 11:2715-8. [PMID: 19514798 DOI: 10.1021/ol900967j] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Appropriately substituted nonracemic allyl alcohols, readily prepared from the corresponding enones by application of the CBS methodology, were converted to optically active cycloheptenone derivatives with almost complete transfer of chirality via an efficient "one-pot", cycloisomerization/Claisen rearrangement process. This methodology was directly applied to the expedient total synthesis of (-)-frondosin B.
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Affiliation(s)
- Timo V Ovaska
- Department of Chemistry, Connecticut College, 270 Mohegan Avenue, New London, Connecticut 06320, USA.
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Ilardi EA, Stivala CE, Zakarian A. [3,3]-Sigmatropic rearrangements: recent applications in the total synthesis of natural products. Chem Soc Rev 2009; 38:3133-48. [PMID: 19847347 DOI: 10.1039/b901177n] [Citation(s) in RCA: 187] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Among the fundamental chemical transformations in organic synthesis, the [3,3]-sigmatropic rearrangement occupies a unique position as a powerful, reliable, and well-defined method for the stereoselective construction of carbon-carbon or carbon-heteroatom bonds. While many other reactions can unite two subunits and create a new bond, the strengths of sigmatropic rearrangements derive from their ability to enable structural reorganization with unmatched build-up of complexity. Recent applications that illustrate [3,3]-sigmatropic processes as a key concept in the synthesis of complex natural products are described in this tutorial review, covering literature from about 2001 through early 2009.
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Affiliation(s)
- Elizabeth A Ilardi
- Department of Chemistry and Biochemistry, University of California at Santa Barbara, Santa Barbara, CA 93106, USA
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Mehta G, Likhite NS. Synthetic studies towards bioactive frondosins: rapid framework access and diversity creation. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.07.021] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Masters KS, Flynn BL. A concise approach to the polycyclic scaffold of frondosin D. J Org Chem 2008; 73:8081-4. [PMID: 18798675 DOI: 10.1021/jo800682n] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In a study directed at developing a concise approach to the polycyclic core of frondosin D, a Stille-Heck sequence has been identified that gives direct access to the trimethylbicyclo[5.4.0]undecane ring system common to all frondosins.
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Affiliation(s)
- Kye-Simeon Masters
- Department of Medicinal Chemistry, Victorian College of Pharmacy, Monash University, 381 Royal Parade, Parkville, VIC 3052, Australia
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Abstract
This review covers the isolation, structural determination, synthesis and chemical and microbiological transformations of natural sesquiterpenoids. 423 references are cited.
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Affiliation(s)
- Braulio M Fraga
- Instituto de Productos Naturales y Agrobiología, CSIC, 38206, La Laguna, Tenerife, Canary Islands, Spain.
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Li X, Keon AE, Sullivan JA, Ovaska TV. Studies toward frondosin A and its analogues. Formal total synthesis of (+/-)-frondosin A. Org Lett 2008; 10:3287-90. [PMID: 18611033 DOI: 10.1021/ol8011343] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Two reaction sequences commencing with different starting materials were successfully employed for the synthesis of frondosin A analogues, including (+/-)-frondosin A dimethyl ether. Construction of the bicyclo[5.4.0]undecane core in each case was achieved through an expedient microwave-assisted tandem 5-exo cyclization--Claisen rearrangement process.
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Affiliation(s)
- Xin Li
- Department of Chemistry, Connecticut College, 270 Mohegan Avenue, New London, Connecticut 06320, USA
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Mak S, Curtis N, Payne A, Congreve M, Wildsmith A, Francis C, Davies J, Pascu S, Burton J, Holmes A. Synthesis of (+)-Obtusenyne. Chemistry 2008; 14:2867-85. [DOI: 10.1002/chem.200701567] [Citation(s) in RCA: 28] [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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Ovaska TV, Kyne RE. Intramolecular thermal allenyne [2 + 2] cycloadditions; facile construction of the 5-6-4 ring core of sterpurene. Tetrahedron Lett 2008; 49:376-378. [PMID: 19562093 DOI: 10.1016/j.tetlet.2007.11.042] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
A variety of 1-allenyl-2-propargyl-substituted cyclopentanol derivatives were found to undergo facile intramolecular microwave-assisted 2+2 alleneyne cycloaddition reactions to generate tricyclic 5-6-4 ring systems present in the sterpurenes.
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Affiliation(s)
- Timo V Ovaska
- Department of Chemistry, Connecticut College, 270 Mohegan Avenue, New London, CT 06320, USA
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Abstract
An expeditious reaction sequence featuring a microwave-assisted tandem 5-exo cyclization-Claisen rearrangement process was used to assemble the A/B ring system of frondosin B. Completion of the target natural product was achieved in 38.2% yield over an eight-step linear sequence.
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Affiliation(s)
- Xin Li
- Department of Chemistry, Connecticut College, 270 Mohegan Avenue, New London, Connecticut 06320, USA
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