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Sono M, Yamashita Y, Hirai M, Nishio Y, Takaoka S, Tori M. One-Electron Oxidation of Geranyl Acetone Derivatives Using Ceric(IV) Ammonium Nitrate and Manganese(III) Acetate: Carbon–Carbon Bond Formation. Nat Prod Commun 2022. [DOI: 10.1177/1934578x221109424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Oxidation of geranyl acetone derivatives with ceric ammonium nitrate (CAN) and Mn(OAc)3 afforded tricyclic and bicyclic compounds as well as hydroxy and nitro compounds as a result of one-electron oxidation followed by carbon–carbon bond formation. This is the first example of radical cyclization (formed by one-electron oxidation) of geranyl acetone derivative 1 and its isomer 4 to give tri- and bicyclic products with carbon–carbon bond formation.
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Affiliation(s)
- Masakazu Sono
- Tokushima Bunri University Faculty of Pharmaceutical Sciences, Tokushima, Japan
| | - Yui Yamashita
- Tokushima Bunri University Faculty of Pharmaceutical Sciences, Tokushima, Japan
| | - Mayu Hirai
- Tokushima Bunri University Faculty of Pharmaceutical Sciences, Tokushima, Japan
| | - Yayoi Nishio
- Tokushima Bunri University Faculty of Pharmaceutical Sciences, Tokushima, Japan
| | - Shigeru Takaoka
- Tokushima Bunri University Faculty of Pharmaceutical Sciences, Tokushima, Japan
| | - Motoo Tori
- Tokushima Bunri University, Tokushima, Japan
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2
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Heravi MM, Nazari A. Samarium(ii) iodide-mediated reactions applied to natural product total synthesis. RSC Adv 2022; 12:9944-9994. [PMID: 35424959 PMCID: PMC8965710 DOI: 10.1039/d1ra08163b] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2021] [Accepted: 03/12/2022] [Indexed: 12/22/2022] Open
Abstract
Natural product synthesis remains a field in which new synthetic methods and reagents are continually being evaluated. Due to the demanding structures and complex functionality of many natural products, only powerful and selective methods and reagents will be highlighted in this proceeding. Since its introduction by Henri Kagan, samarium(ii) iodide (SmI2, Kagan's reagent) has found increasing use in chemical synthesis. Over the years, many reviews have been published on the application of SmI2 in numerous reductive coupling procedures as well as in natural product total synthesis. This review highlights recent advances in SmI2-mediated synthetic strategies, as applied in the total synthesis of natural products since 2004. Natural product synthesis remains a field in which new synthetic methods and reagents are continually being evaluated.![]()
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Affiliation(s)
- Majid M Heravi
- Department of Chemistry, School of Science, Alzahra University PO Box 1993891176 Vanak Tehran Iran +98 21 88041344 +98 21 88044051
| | - Azadeh Nazari
- Department of Chemistry, School of Science, Alzahra University PO Box 1993891176 Vanak Tehran Iran +98 21 88041344 +98 21 88044051
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3
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Nimkar A, Maity S, Hoz S. Coordination of tridentate ligands to SmI 2: cooperativity and incremental effect on reduction potential and on reactivity. PURE APPL CHEM 2020. [DOI: 10.1515/pac-2019-0213] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Abstract
The effect of coordination of a series of tridentate ligands (TDLs) on various features of SmI2 was determined. The TDLs used in this study were diethylene glycol (OOO), diethanolamine (ONO), 2-(2-Aminoethoxy) ethanol (OON), N-(2-Hydroxyethyl) ethylene diamine (ONN) and glycerol (GLY). Of special interest is the effect of these additives on the reduction potential of SmI2. The cyclic voltammograms of the TDLs with nitrogen at the binding sites display simultaneously several peaks, each corresponding to a different coordination level of SmI2, enabling determination of three equilibrium constants. The results are in concert with electronic spectra of SmI2 complexes with these ligands. The second and third equilibrium constants were found to be larger than the first, demonstrating the cooperativity effect. Moreover, the incremental effect of each moiety on the reduction potential of SmI2 was determined. Regarding reactivity of SmI2, excessive coordination of some ligands is shown to have an adverse effect.
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Affiliation(s)
- Amey Nimkar
- Department of Chemistry , Bar-Ilan University , Ramat Gan 5290002 , Israel
| | - Sandeepan Maity
- Department of Chemistry , Bar-Ilan University , Ramat Gan 5290002 , Israel
| | - Shmaryahu Hoz
- Department of Chemistry , Bar-Ilan University , Ramat Gan 5290002 , Israel
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4
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Tori M. [Diversity of Plants Belonging to the Genus Ligularia (Asteraceae) Based on Terpenoids and Synthetic Studies on Some Terpenoids]. YAKUGAKU ZASSHI 2016; 136:309-27. [PMID: 26831809 DOI: 10.1248/yakushi.15-00238] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The terpenoid constituents of Ligularia virgaurea (30 samples), Ligularia pleurocaulis (8 samples), Ligularia dictyoneura (8 samples), Ligularia brassicoides (5 samples), Ligularia lingiana (1 sample), and Ligularia liatroides (1 sample)(all belonging to section Senecillis of Ligularia, Asteraceae and collected in Yunnan, Sichuan, Qinghai, and Gansu provinces, China), from which 220 compounds were isolated, including 113 novel ones, are reviewed. Five chemotypes were identified in L. virgaurea based on their chemical constituents, while three clades were detected from the base sequences. Although intra-specific diversity was found in L. virgaurea, more samples were needed of other species in order to reach a definite conclusion. Inter-specific diversity was also examined in section Senecillis but was restricted due to the scarcity of samples. Synthetic studies on chiral natural products to determine their absolute configurations, especially those of riccardiphenols A and B as well as crispatanolide, which were all isolated from the liverwort, are briefly reviewed.
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Affiliation(s)
- Motoo Tori
- Faculty of Pharmaceutical Sciences, Tokushima Bunri University
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5
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Sono M, Nishibuchi Y, Yamaguchi N, Tori M. Cyclization into Hydrindanes Using Samarium Diiodide: Stereochemical Features Depending on the Protecting Group. Nat Prod Commun 2016. [DOI: 10.1177/1934578x1601100807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Monocyclic compounds bearing ketone and enone moieties in the same molecule can be cyclized to bicyclic compounds initiated by samarium diiodide. The stereochemistry of the products depended on the reaction conditions and also the protecting group of the hydroxy group existed in the molecule. A cyclization mechanism is discussed.
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Affiliation(s)
- Masakazu Sono
- Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima, 770-8514, Japan
| | - Yukiko Nishibuchi
- Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima, 770-8514, Japan
| | - Norihito Yamaguchi
- Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima, 770-8514, Japan
| | - Motoo Tori
- Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima, 770-8514, Japan
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6
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Racine E, Burchak ON, Py S. Synthesis of α-Acyloxynitrones and Reactivity towards Samarium Diiodide. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600478] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Emilie Racine
- Univ. Grenoble Alpes; DCM; CNRS; DCM; 38000 Grenoble France
| | | | - Sandrine Py
- Univ. Grenoble Alpes; DCM; CNRS; DCM; 38000 Grenoble France
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7
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Kise N, Tuji T, Sakurai T. Stereoselective intramolecular coupling of barbituric acids with aliphatic ketones and O-methyl oximes by electroreduction: radical cyclization mechanism supported by DFT study. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.03.035] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Zhang S, Naab BD, Jucov EV, Parkin S, Evans EGB, Millhauser GL, Timofeeva TV, Risko C, Brédas JL, Bao Z, Barlow S, Marder SR. n-Dopants Based on Dimers of Benzimidazoline Radicals: Structures and Mechanism of Redox Reactions. Chemistry 2015; 21:10878-85. [PMID: 26088609 DOI: 10.1002/chem.201500611] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2015] [Indexed: 11/07/2022]
Abstract
Dimers of 2-substituted N,N'-dimethylbenzimidazoline radicals, (2-Y-DMBI)2 (Y=cyclohexyl (Cyc), ferrocenyl (Fc), ruthenocenyl (Rc)), have recently been reported as n-dopants for organic semiconductors. Here their structural and energetic characteristics are reported, along with the mechanisms by which they react with acceptors, A (PCBM, TIPS-pentacene), in solution. X-ray data and DFT calculations both indicate a longer C-C bond for (2-Cyc-DMBI)2 than (2-Fc-DMBI)2 , yet DFT and ESR data show that the latter dissociates more readily due to stabilization of the radical by Fc. Depending on the energetics of dimer (D2 ) dissociation and of D2 -to-A electron transfer, D2 reacts with A to form D(+) and A(-) by either of two mechanisms, differing in whether the first step is endergonic dissociation or endergonic electron transfer. However, the D(+) /0.5 D2 redox potentials-the effective reducing strengths of the dimers-vary little within the series (ca. -1.9 V vs. FeCp2 (+/0) ) (Cp=cyclopentadienyl) due to cancelation of trends in the D(+/0) potential and D2 dissociation energy. The implications of these findings for use of these dimers as n-dopants, and for future dopant design, are discussed.
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Affiliation(s)
- Siyuan Zhang
- School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, GA 30332-0400 (USA)
| | - Benjamin D Naab
- Departments of Chemical Engineering and Chemistry, Stanford University, Stanford, CA 94303 (USA)
| | - Evgheni V Jucov
- Department of Chemistry, New Mexico Highlands University, Las Vegas, NM 87701 (USA)
| | - Sean Parkin
- Department of Chemistry, University of Kentucky, Lexington, KY 40506 (USA)
| | - Eric G B Evans
- Department of Chemistry and Biochemistry, University of California - Santa Cruz, Santa Cruz, CA 95064 (USA)
| | - Glenn L Millhauser
- Department of Chemistry and Biochemistry, University of California - Santa Cruz, Santa Cruz, CA 95064 (USA)
| | - Tatiana V Timofeeva
- Department of Chemistry, New Mexico Highlands University, Las Vegas, NM 87701 (USA)
| | - Chad Risko
- School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, GA 30332-0400 (USA)
- Department of Chemistry and Center for Applied Energy Research (CAER), University of Kentucky, Lexington, KY 40506-0055 (USA)
| | - Jean-Luc Brédas
- School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, GA 30332-0400 (USA)
- Division of Physical Sciences and Engineering King Abdullah University of Science and Technology, Thuwal, 23955-6900 (Saudi Arabia)
| | - Zhenan Bao
- Departments of Chemical Engineering and Chemistry, Stanford University, Stanford, CA 94303 (USA).
| | - Stephen Barlow
- School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, GA 30332-0400 (USA).
| | - Seth R Marder
- School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, GA 30332-0400 (USA).
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