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Holmbo SD, Pronin SV. A Concise Approach to Anthraquinone-Xanthone Heterodimers. J Am Chem Soc 2018; 140:5065-5068. [PMID: 29621399 DOI: 10.1021/jacs.8b03110] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A synthetic approach to anthraquinone-xanthone heterodimers is described. The route to the pentacyclic core features an efficient assembly of a benzocycloheptenone via a new intramolecular oxidative arylation of an enol ether and a Hauser-Kraus annulation-aldol reaction sequence to access the characteristic bicyclo[3.2.2]nonene motif. Acremoxanthone A is synthesized in 10 steps from commercially available material to demonstrate the application of this approach.
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Affiliation(s)
- Stephen D Holmbo
- Department of Chemistry , University of California , Irvine , California 92697-2025 , United States
| | - Sergey V Pronin
- Department of Chemistry , University of California , Irvine , California 92697-2025 , United States
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2
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Kita Y, Dohi T. Pioneering Metal-Free Oxidative Coupling Strategy of Aromatic Compounds Using Hypervalent Iodine Reagents. CHEM REC 2015. [DOI: 10.1002/tcr.201500020] [Citation(s) in RCA: 101] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Yasuyuki Kita
- College of Pharmaceutical Sciences; Ritsumeikan University; 1-1-1 Nojihigashi Kusatsu Shiga 525-8577 Japan
| | - Toshifumi Dohi
- College of Pharmaceutical Sciences; Ritsumeikan University; 1-1-1 Nojihigashi Kusatsu Shiga 525-8577 Japan
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Sreenithya A, Sunoj RB. Mechanistic insights on iodine(III) promoted metal-free dual C-H activation involved in the formation of a spirocyclic bis-oxindole. Org Lett 2014; 16:6224-7. [PMID: 25420189 DOI: 10.1021/ol503161g] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The mechanism of a metal-free, phenyliodine(III) bis(trifluoroacetate) promoted, dual aryl C-H activation of an anilide to a spirocyclic bis-oxindole is examined using density functional theory (M06-2X). The most preferred pathway proceeds through the involvement of a novel iodonium ion intermediate and a pivotal trifluoroacetate counterion. The two sequential aryl C-H activations, assisted by trifluoroacetate as well as the superior leaving group ability of PhI, facilitate the formation of spirocyclic bis-oxindole.
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Affiliation(s)
- A Sreenithya
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Raghavan B Sunoj
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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Hamamoto H. Development and application of new oxidation systems utilizing oxometalate catalysts. Chem Pharm Bull (Tokyo) 2012; 60:799-817. [PMID: 22790811 DOI: 10.1248/cpb.c112001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
This review describes our recent efforts in the development and application of new oxidation systems utilizing oxometalate catalysts. The novel use of heteropoly acid (HPA), an acidic oxometalate catalyst, in hypervalent iodine-mediated oxidations provided an effective strategy to generate cation radical species that enables a variety of direct C-H functionalizations of aromatic compounds. This strategy brought a facile biaryl synthesis and new spirodienone syntheses in aromatic oxidation chemistry. Moreover, this strategy opens up a facile synthetic route to morphinandienone alkaloids. On the other hand, the use of oxometalate catalyst together with poly(N-isopropylacrylamide) (PNIPAAm)-based polymer in the development of new solid-phase catalyst provided a novel reaction system in water. Due to the characteristic temperature-responsive intelligence of PNIPAAm, this reaction system brought a remarkable acceleration of the reactivity and ease of catalyst recovering in catalytic oxidation that uses hydrogen peroxide or oxygen gas (O<inf>2</inf>) as primary oxidant. In addition, the recovered solid-phase catalyst could be used for consecutive reactions without any significant loss of its catalytic efficacy.
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Affiliation(s)
- Hiromi Hamamoto
- School of Pharmaceutical Sciences, Kinki University, 3–4–1 Kowakae, Higashi-Osaka, Japan.
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Hata K, Hamamoto H, Shiozaki Y, Kita Y. A new synthesis of dienone lactones using a combination of hypervalent iodine(iii) reagent and heteropoly acid. Chem Commun (Camb) 2005:2465-7. [PMID: 15886772 DOI: 10.1039/b501792k] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The oxidation of non-phenolic alkanoic acid derivatives to oxygen heterocycles was investigated; a new oxidative route to dienone lactones has been developed using a combination of hypervalent iodine(III) reagent, phenyliodine(III) bis(trifluoroacetate)(PIFA), and heteropoly acid (HPA).
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Affiliation(s)
- Kayoko Hata
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6, Yamada-oka, Suita, Osaka 565-0871, Japan
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Kita Y. [Development of novel synthetic organic reactions: synthesis of antitumor natural products and leading compounds for new pharmaceuticals]. YAKUGAKU ZASSHI 2002; 122:1011-35. [PMID: 12510383 DOI: 10.1248/yakushi.122.1011] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Biologically active natural products with unique, highly complex molecular skeletons have been used as leading compounds for raw materials of new drugs. Due to the limitations of natural supply, highly efficient, large-scale syntheses and molecular design have been sought in drug discovery. For this purpose, we have focused on a synthetic strategy effective in developing novel reactions and reagents and found several useful regio- and stereospecific reactions, contributing to the synthesis of otherwise unattainable target molecules. The application of these reactions for the total synthesis of three types of potent cytotoxic natural products for the first time is described in this paper. The basic concept is first described. Then the total synthesis of anthracyclines, fredericamycin A, and discorhabdins is reported. Novel reactions using hypervalent iodine reagents under environmentally benign conditions are also described. The future prospects for this method are discussed.
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Affiliation(s)
- Yasuyuki Kita
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565-0871, Japan.
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Ochiai M, Kitagawa Y, Takayama N, Takaoka Y, Shiro M. Synthesis of Chiral Diaryliodonium Salts, 1,1‘-Binaphthyl-2-yl(phenyl)iodonium Tetrafluoroborates: Asymmetric α-Phenylation of β-Keto Ester Enolates. J Am Chem Soc 1999. [DOI: 10.1021/ja992236c] [Citation(s) in RCA: 138] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Masahito Ochiai
- Faculty of Pharmaceutical Sciences, University of Tokushima, 1-78 Shomachi, Tokushima 770-8505, Japan Gifu Pharmaceutical University 5-6-1 Mitahora Higashi, Gifu 502-0003, Japan Rigaku Corporation, 3-9-12 Matsubara Akishima, Tokyo 196-8666, Japan
| | - Yutaka Kitagawa
- Faculty of Pharmaceutical Sciences, University of Tokushima, 1-78 Shomachi, Tokushima 770-8505, Japan Gifu Pharmaceutical University 5-6-1 Mitahora Higashi, Gifu 502-0003, Japan Rigaku Corporation, 3-9-12 Matsubara Akishima, Tokyo 196-8666, Japan
| | - Naoko Takayama
- Faculty of Pharmaceutical Sciences, University of Tokushima, 1-78 Shomachi, Tokushima 770-8505, Japan Gifu Pharmaceutical University 5-6-1 Mitahora Higashi, Gifu 502-0003, Japan Rigaku Corporation, 3-9-12 Matsubara Akishima, Tokyo 196-8666, Japan
| | - Yoshikazu Takaoka
- Faculty of Pharmaceutical Sciences, University of Tokushima, 1-78 Shomachi, Tokushima 770-8505, Japan Gifu Pharmaceutical University 5-6-1 Mitahora Higashi, Gifu 502-0003, Japan Rigaku Corporation, 3-9-12 Matsubara Akishima, Tokyo 196-8666, Japan
| | - Motoo Shiro
- Faculty of Pharmaceutical Sciences, University of Tokushima, 1-78 Shomachi, Tokushima 770-8505, Japan Gifu Pharmaceutical University 5-6-1 Mitahora Higashi, Gifu 502-0003, Japan Rigaku Corporation, 3-9-12 Matsubara Akishima, Tokyo 196-8666, Japan
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Abramovitch RA, Ye X. Intramolecular Cyclizations via Arylnitrenium Ions. Formation of a Six-Membered Ring Rather than a Macrocycle. J Org Chem 1999. [DOI: 10.1021/jo990362t] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Xiaocong Ye
- Department of Chemistry, Clemson University, Clemson, South Carolina 29634-1905
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Kita Y, Takada T, Gyoten M, Tohma H, Zenk MH, Eichhorn J. An Oxidative Intramolecular Phenolic Coupling Reaction for the Synthesis of Amaryllidaceae Alkaloids Using a Hypervalent Iodine(III) Reagent. J Org Chem 1996. [DOI: 10.1021/jo9606766] [Citation(s) in RCA: 110] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yasuyuki Kita
- Faculty of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565, Japan, and Lehrstuhl für Pharmazeutische Biologie, Universität München, Karlstrasse 29 80333 München, Germany
| | - Takeshi Takada
- Faculty of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565, Japan, and Lehrstuhl für Pharmazeutische Biologie, Universität München, Karlstrasse 29 80333 München, Germany
| | - Michiyo Gyoten
- Faculty of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565, Japan, and Lehrstuhl für Pharmazeutische Biologie, Universität München, Karlstrasse 29 80333 München, Germany
| | - Hirofumi Tohma
- Faculty of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565, Japan, and Lehrstuhl für Pharmazeutische Biologie, Universität München, Karlstrasse 29 80333 München, Germany
| | - Meinhart H. Zenk
- Faculty of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565, Japan, and Lehrstuhl für Pharmazeutische Biologie, Universität München, Karlstrasse 29 80333 München, Germany
| | - Jörg Eichhorn
- Faculty of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565, Japan, and Lehrstuhl für Pharmazeutische Biologie, Universität München, Karlstrasse 29 80333 München, Germany
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Affiliation(s)
- Peter J. Stang
- Department of Chemistry, University of Minnesota-Duluth, Duluth, Minnesota 55812
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Kita Y, Egi M, Okajima A, Ohtsubo M, Takada T, Tohma H. Hypervalent iodine(III) induced intramolecular cyclization of substituted phenol ethers bearing an alkyl azido sidechain–a novel synthesis of quinone imine ketals. Chem Commun (Camb) 1996. [DOI: 10.1039/cc9960001491] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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