1
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Gennaiou K, Kelesidis A, Zografos AL. Climbing the Oxidase Phase Ladder by Using Dioxygen as the Sole Oxidant: The Case Study of Costunolide. Org Lett 2024; 26:2934-2938. [PMID: 38551481 PMCID: PMC11187638 DOI: 10.1021/acs.orglett.4c00406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Revised: 03/06/2024] [Accepted: 03/28/2024] [Indexed: 04/20/2024]
Abstract
Natural sesquiterpenoid lactones are prominent scaffolds in drug discovery. Despite the progress made in their synthesis, their extensive oxidative decoration makes their chemo- and stereoselective syntheses highly challenging. Herein, we report our effort to mimic part of the oxidase phase used in the costunolide pathway to achieve the protecting-group-free total synthesis of santamarine, dehydrocostus lactone, estafiatin, and nine more related natural sesquiterpenoid lactones by using dioxygen as the sole oxidant.
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Affiliation(s)
- Kyriaki Gennaiou
- Department of Chemistry, Aristotle
University of Thessaloniki, Main University
Campus, Thessaloniki, 54124, Greece
| | - Antonis Kelesidis
- Department of Chemistry, Aristotle
University of Thessaloniki, Main University
Campus, Thessaloniki, 54124, Greece
| | - Alexandros L. Zografos
- Department of Chemistry, Aristotle
University of Thessaloniki, Main University
Campus, Thessaloniki, 54124, Greece
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2
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Zorrilla JG, Cárdenas DM, Rial C, Molinillo JM, Varela RM, Masi M, Macías FA. Bioprospection of Phytotoxic Plant-Derived Eudesmanolides and Guaianolides for the Control of Amaranthus viridis, Echinochloa crus-galli, and Lolium perenne Weeds. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024; 72:1797-1810. [PMID: 38206382 PMCID: PMC10811690 DOI: 10.1021/acs.jafc.3c06901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2023] [Revised: 12/25/2023] [Accepted: 12/27/2023] [Indexed: 01/12/2024]
Abstract
The phytotoxicities of a selection of eudesmanolides and guaianolides, including natural products and new derivatives obtained by semisynthesis from plant-isolated sesquiterpene lactones, were evaluated in bioassays against three weeds of concern in agriculture (Amaranthus viridis L., Echinochloa crus-galli L., and Lolium perenne L.). Both eudesmanolides and guaianolides were active against the root and shoot growth of all the species, with the eudesmanolides generally showing improved activities. The IC50 values obtained for the herbicide employed as positive control (on root and shoot growth, respectively, A. viridis: 27.8 and 85.7 μM; E. crus-galli: 167.5 and 288.2 μM; L. perenne: 99.1 and 571.4 μM) were improved in most of the cases. Structure-activity relationships were discussed, finding that hydroxylation of the A-ring and C-13 as well as the position, number, and orientation of the hydroxyl groups and the presence of an unsaturated carbonyl group can significantly influence the level of phytotoxicity. γ-Cyclocostunolide was the most active compound in the series, followed by others such as dehydrozaluzanin C and α-cyclocostunolide (outstanding their IC50 values on A. viridis)─natural products that can therefore be suggested as models for herbicide development if further research indicates effectiveness on a larger scale and environmental safety in ecotoxicological assessments.
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Affiliation(s)
- Jesús G. Zorrilla
- Department
of Chemical Sciences, University of Naples
Federico II, Complesso Universitario Monte S. Angelo, Via Cinthia 4, 80126 Naples, Italy
- Allelopathy
Group, Department of Organic Chemistry, Facultad de Ciencias, Institute
of Biomolecules (INBIO), University of Cadiz, C/Avenida República Saharaui,
7, 11510 Puerto
Real, Spain
| | - David M. Cárdenas
- Allelopathy
Group, Department of Organic Chemistry, Facultad de Ciencias, Institute
of Biomolecules (INBIO), University of Cadiz, C/Avenida República Saharaui,
7, 11510 Puerto
Real, Spain
| | - Carlos Rial
- Allelopathy
Group, Department of Organic Chemistry, Facultad de Ciencias, Institute
of Biomolecules (INBIO), University of Cadiz, C/Avenida República Saharaui,
7, 11510 Puerto
Real, Spain
| | - José M.G. Molinillo
- Allelopathy
Group, Department of Organic Chemistry, Facultad de Ciencias, Institute
of Biomolecules (INBIO), University of Cadiz, C/Avenida República Saharaui,
7, 11510 Puerto
Real, Spain
| | - Rosa M. Varela
- Allelopathy
Group, Department of Organic Chemistry, Facultad de Ciencias, Institute
of Biomolecules (INBIO), University of Cadiz, C/Avenida República Saharaui,
7, 11510 Puerto
Real, Spain
| | - Marco Masi
- Department
of Chemical Sciences, University of Naples
Federico II, Complesso Universitario Monte S. Angelo, Via Cinthia 4, 80126 Naples, Italy
| | - Francisco A. Macías
- Allelopathy
Group, Department of Organic Chemistry, Facultad de Ciencias, Institute
of Biomolecules (INBIO), University of Cadiz, C/Avenida República Saharaui,
7, 11510 Puerto
Real, Spain
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3
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Lindner H, Amberg WM, Carreira EM. Iron-Mediated Photochemical Anti-Markovnikov Hydroazidation of Unactivated Olefins. J Am Chem Soc 2023; 145:22347-22353. [PMID: 37811819 PMCID: PMC10591317 DOI: 10.1021/jacs.3c09122] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Indexed: 10/10/2023]
Abstract
Unactivated olefins are converted to alkyl azides with bench-stable NaN3 in the presence of FeCl3·6H2O under blue-light irradiation. The products are obtained with anti-Markovnikov selectivity, and the reaction can be performed under mild ambient conditions in the presence of air and moisture. The transformation displays broad functional group tolerance, which renders it suitable for functionalization of complex molecules. Mechanistic investigations are conducted to provide insight into the hydroazidation reaction and reveal the role of water from the iron hydrate as the H atom source.
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Affiliation(s)
- Henry Lindner
- Department of Chemistry and
Applied Biosciences, Laboratory of Organic Chemistry, ETH Zürich, 8093 Zurich, Switzerland
| | - Willi M. Amberg
- Department of Chemistry and
Applied Biosciences, Laboratory of Organic Chemistry, ETH Zürich, 8093 Zurich, Switzerland
| | - Erick M. Carreira
- Department of Chemistry and
Applied Biosciences, Laboratory of Organic Chemistry, ETH Zürich, 8093 Zurich, Switzerland
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4
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Jurado S, Illa O, Álvarez-Larena A, Pannecouque C, Busqué F, Alibés R. Conformationally Locked Carbocyclic Nucleosides Built on a 4'-Hydroxymethyl-3'-hydroxybicyclo[4.1.0]heptane Template. Stereoselective Synthesis and Antiviral Activity. J Org Chem 2022; 87:15166-15177. [PMID: 36300902 PMCID: PMC9680032 DOI: 10.1021/acs.joc.2c01661] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Two new families of enantiomerically pure carbocyclic nucleoside analogues based on a cyclohexane moiety with five chiral centers and a fused cyclopropyl ring have been synthesized. A highly regio- and stereoselective synthetic approach for the modular construction of the functionalized bicyclo[4.1.0]heptyl azide intermediate 6 has been established. Key steps to achieve this asymmetric synthesis involved highly diastereoselective allylic oxidation and hydroboration reactions. The first family of compounds, 1a,b and 2, presents different natural nucleobases, whereas the second one 3a-e bears functionalized 1,2,3-triazoles. These derivatives have been tested as antiviral agents, and compound 3d has shown to display moderate activity against coxsackie B4 virus.
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Affiliation(s)
- Sergio Jurado
- Departament
de Química, Universitat Autònoma
de Barcelona, Bellaterra, Barcelona 08193, Spain
| | - Ona Illa
- Departament
de Química, Universitat Autònoma
de Barcelona, Bellaterra, Barcelona 08193, Spain
| | - Angel Álvarez-Larena
- Servei
de Difracció de Raigs X, Universitat
Autònoma de Barcelona, Bellaterra, Barcelona 08193, Spain
| | - Christophe Pannecouque
- Department
of Microbiology and Immunology, Laboratory of Virology and Chemotherapy,
Rega Institute for Medical Research, KU
Leuven, Herestraat 49, Leuven B-3000, Belgium
| | - Félix Busqué
- Departament
de Química, Universitat Autònoma
de Barcelona, Bellaterra, Barcelona 08193, Spain,
| | - Ramon Alibés
- Departament
de Química, Universitat Autònoma
de Barcelona, Bellaterra, Barcelona 08193, Spain,
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5
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Liu X, Wang C, Li S, Qu L, Yin F, Lu D, Luo H, Chen X, Luo Z, Cui N, Wang X, Kong L. Parthenolide Derivatives as PKM2 Activators Showing Potential in Colorectal Cancer. J Med Chem 2021; 64:17304-17325. [PMID: 34847663 DOI: 10.1021/acs.jmedchem.1c01380] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
As a vital kinase in the glycolysis system, PKM2 is extensively expressed in colorectal cancer (CRC) to support the energy and biosynthetic needs. In this study, we designed a series of parthenolide (PTL) derivatives through a stepwise structure optimization, and an excellent derivate 29e showed good activity on PKM2 (AC50 = 86.29 nM) and displayed significant antiproliferative activity against HT29 (IC50 = 0.66 μM) and SW480 (IC50 = 0.22 μM) cells. 29e decreased the expression of total PKM2, prevented nucleus translocation of PKM2 dimer, and inhibited PKM2/STAT3 signaling pathway. 29e remarkably increased OCR and decreased the extracellular acidification rate (ECAR). The antiproliferative effect of 29e depended on PKM2, and the Cys424 of PKM2 was the key binding site. Furthermore, 29e significantly suppressed tumor growth in the HT29 xenograft model without obvious toxicity. These outcomes demonstrate that 29e is a promising drug candidate for the treatment of CRC.
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Affiliation(s)
- Xingchen Liu
- Jiangsu Key Laboratory of Bioactive Natural Product Research and State Key Laboratory of Natural Medicines, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 210009, People's Republic of China
| | - Cheng Wang
- Jiangsu Key Laboratory of Bioactive Natural Product Research and State Key Laboratory of Natural Medicines, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 210009, People's Republic of China
| | - Shang Li
- Jiangsu Key Laboratory of Bioactive Natural Product Research and State Key Laboratory of Natural Medicines, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 210009, People's Republic of China
| | - Lailiang Qu
- Jiangsu Key Laboratory of Bioactive Natural Product Research and State Key Laboratory of Natural Medicines, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 210009, People's Republic of China
| | - Fucheng Yin
- Jiangsu Key Laboratory of Bioactive Natural Product Research and State Key Laboratory of Natural Medicines, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 210009, People's Republic of China
| | - Dehua Lu
- Jiangsu Key Laboratory of Bioactive Natural Product Research and State Key Laboratory of Natural Medicines, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 210009, People's Republic of China
| | - Heng Luo
- Jiangsu Key Laboratory of Bioactive Natural Product Research and State Key Laboratory of Natural Medicines, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 210009, People's Republic of China
| | - Xinye Chen
- Jiangsu Key Laboratory of Bioactive Natural Product Research and State Key Laboratory of Natural Medicines, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 210009, People's Republic of China
| | - Zhongwen Luo
- Jiangsu Key Laboratory of Bioactive Natural Product Research and State Key Laboratory of Natural Medicines, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 210009, People's Republic of China
| | - Ningjie Cui
- Jiangsu Key Laboratory of Bioactive Natural Product Research and State Key Laboratory of Natural Medicines, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 210009, People's Republic of China
| | - Xiaobing Wang
- Jiangsu Key Laboratory of Bioactive Natural Product Research and State Key Laboratory of Natural Medicines, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 210009, People's Republic of China
| | - Lingyi Kong
- Jiangsu Key Laboratory of Bioactive Natural Product Research and State Key Laboratory of Natural Medicines, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 210009, People's Republic of China
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6
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Li TZ, Yang XT, Wang JP, Geng CA, Ma YB, Su LH, Zhang XM, Chen JJ. Biomimetic Synthesis of Lavandiolides H, I, and K and Artematrolide F via Diels-Alder Reaction. Org Lett 2021; 23:8380-8384. [PMID: 34634203 DOI: 10.1021/acs.orglett.1c03120] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The biomimetic synthesis of guaianolide dimers lavandiolides H, I, and K and artematrolide F containing a spirolactone moiety has been accomplished for the first time from naturally abundant arglabin in four to six steps with an overall yield up to 60%, and a series of natural product-like guaianolide dimers, trimer, and tetramer were also successfully synthesized. Notably, the trimeric compound exhibited antihepatoma cytotoxicity more potent than that of sorafenib with IC50 values of 6.2 μM (HepG2), 6.8 μM (Huh7), and 7.2 μM (SK-HEP-1).
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Affiliation(s)
- Tian-Ze Li
- State Key Laboratory of Phytochemistry and Plant Resources in West China and Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, People's Republic of China
| | - Xiao-Tong Yang
- State Key Laboratory of Phytochemistry and Plant Resources in West China and Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, People's Republic of China
| | - Jin-Ping Wang
- State Key Laboratory of Phytochemistry and Plant Resources in West China and Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, People's Republic of China
| | - Chang-An Geng
- State Key Laboratory of Phytochemistry and Plant Resources in West China and Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, People's Republic of China
| | - Yun-Bao Ma
- State Key Laboratory of Phytochemistry and Plant Resources in West China and Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, People's Republic of China
| | - Li-Hua Su
- State Key Laboratory of Phytochemistry and Plant Resources in West China and Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, People's Republic of China
| | - Xue-Mei Zhang
- State Key Laboratory of Phytochemistry and Plant Resources in West China and Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, People's Republic of China
| | - Ji-Jun Chen
- State Key Laboratory of Phytochemistry and Plant Resources in West China and Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, People's Republic of China.,University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
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7
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Martínez AR, Morales LP, Ojeda ED, Rodríguez MC, Rodríguez-García I. The Proven Versatility of Cp 2TiCl. J Org Chem 2020; 86:1311-1329. [PMID: 33147037 DOI: 10.1021/acs.joc.0c01233] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
In the last two decades, titanocene monochloride has been postulated as a monoelectronic transfer reagent capable of catalyzing an important variety of chemical transformations. In this Perspective, our contributions to this growing field of research are summarized and analyzed. Especially known have been our contributions in C-C bond formation reactions, hydrogen-atom transfer from water to radicals, and isomerization reactions, as well as the development of a catalytic cycle that has subsequently allowed the preparation of a great variety of natural terpenes. It is also worth mentioning our contribution in the postulation of this single-electron transfer agent (SET) as a new green catalyst with a broad range of applications in organic and organometallic chemistry. The most significant catalytic processes developed by other research groups are also briefly described, with special emphasis on the reaction mechanisms involved. Finally, a reflection is made on the future trends in the research of this SET, aimed at consolidating this chemical as a new green reagent that will be widely used in fine chemistry, green chemistry, and industrial chemical processes.
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Affiliation(s)
- Antonio Rosales Martínez
- Department of Chemical Engineering, Escuela Politécnica Superior, University of Sevilla, 41011 Sevilla, Spain
| | - Laura Pozo Morales
- Department of Chemical Engineering, Escuela Politécnica Superior, University of Sevilla, 41011 Sevilla, Spain
| | - Emilio Díaz Ojeda
- Department of Chemical Engineering, Escuela Politécnica Superior, University of Sevilla, 41011 Sevilla, Spain
| | - María Castro Rodríguez
- Department of Chemical Engineering, Escuela Politécnica Superior, University of Sevilla, 41011 Sevilla, Spain
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8
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Fermi A, Gualandi A, Bergamini G, Cozzi PG. Shining Light on Ti
IV
Complexes: Exceptional Tools for Metallaphotoredox Catalysis. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000966] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Andrea Fermi
- Dipartimento di Chimica "G. Ciamician" Università di Bologna via Selmi 2 40126 Bologna Italy
| | - Andrea Gualandi
- Dipartimento di Chimica "G. Ciamician" Università di Bologna via Selmi 2 40126 Bologna Italy
| | - Giacomo Bergamini
- Dipartimento di Chimica "G. Ciamician" Università di Bologna via Selmi 2 40126 Bologna Italy
| | - Pier Giorgio Cozzi
- Dipartimento di Chimica "G. Ciamician" Università di Bologna via Selmi 2 40126 Bologna Italy
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9
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Feng S, Chen C, Chan KS. Rhodium Porphyrin Catalyzed Regioselective Hydrogenolysis of 1,2-Diarylcyclopropanes with Water as the Hydrogen Source. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00022] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shiyu Feng
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, People’s Republic of China
| | - Chen Chen
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, People’s Republic of China
| | - Kin Shing Chan
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, People’s Republic of China
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10
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Xue D, Xu M, Zheng C, Yang B, Hou M, He H, Gao S. Titanium-promoted Intramolecular Photoenolization/Diels-Alder Reaction to Construct Polycyclic Terpenoids: Formal Synthesis of Mycoleptodiscin A. CHINESE J CHEM 2019. [DOI: 10.1002/cjoc.201800555] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Dongsheng Xue
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering; East China Normal University; 3663N Zhongshan Road, Shanghai 200062 China
| | - Mengmeng Xu
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering; East China Normal University; 3663N Zhongshan Road, Shanghai 200062 China
| | - Chaoying Zheng
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering; East China Normal University; 3663N Zhongshan Road, Shanghai 200062 China
| | - Baochao Yang
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering; East China Normal University; 3663N Zhongshan Road, Shanghai 200062 China
| | - Min Hou
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering; East China Normal University; 3663N Zhongshan Road, Shanghai 200062 China
| | - Haibing He
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development; East China Normal University; 3663N Zhongshan Road, Shanghai 200062 China
| | - Shuanhu Gao
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering; East China Normal University; 3663N Zhongshan Road, Shanghai 200062 China
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development; East China Normal University; 3663N Zhongshan Road, Shanghai 200062 China
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11
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Gordon J, Hildebrandt S, Dewese KR, Klare S, Gansäuer A, RajanBabu TV, Nugent WA. Demystifying Cp 2Ti(H)Cl and its Enigmatic Role in the Reactions of Epoxides with Cp 2TiCl. Organometallics 2018; 37:4801-4809. [PMID: 30733623 DOI: 10.1021/acs.organomet.8b00793] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The role of Cp2Ti(H)Cl in the reactions of Cp2TiCl with trisubstituted epoxides has been investigated in a combined experimental and computational study. Although Cp2Ti(H)Cl has generally been regarded as a robust species, its decomposition to Cp2TiCl and molecular hydrogen was found to be exothermic (ΔG = -11 kcal/mol when the effects of THF solvation are considered). In laboratory studies, Cp2Ti(H)Cl was generated using the reaction of 1,2-epoxy-1-methylcyclohexane with Cp2TiCl as a model. Rapid evolution of hydrogen gas was demonstrated, indicating that Cp2Ti(H)Cl is indeed a thermally unstable molecule, which undergoes intermolecular reductive elimination of hydrogen under the reaction conditions. The stoichiometry of the reaction (Cp2TiCl:epoxide = 1:1) and the quantity of hydrogen produced (1 mole per 2 moles of epoxide) is consistent with this assertion. The diminished yield of allylic alcohol from these reactions under the conditions of protic versus aprotic catalysis can be understood in terms of the predominant titanium(III) present in solution. Under the conditions of protic catalysis, Cp2TiCl complexes with collidine hydrochloride and the titanium(III) center is less available for "cross-disproportionation" with carbon-centered radicals; this leads to by-products from radical capture by hydrogen atom transfer, resulting in a saturated alcohol.
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Affiliation(s)
- Jonathan Gordon
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, OH 43210, USA
| | - Sven Hildebrandt
- Kekulé-Institut für Organische Chemie und Biochemie, Universität Bonn, Gerhard-Domagk-Straße 1, 53121 Bonn, Germany
| | - Kendra R Dewese
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, OH 43210, USA
| | - Sven Klare
- Kekulé-Institut für Organische Chemie und Biochemie, Universität Bonn, Gerhard-Domagk-Straße 1, 53121 Bonn, Germany
| | - Andreas Gansäuer
- Kekulé-Institut für Organische Chemie und Biochemie, Universität Bonn, Gerhard-Domagk-Straße 1, 53121 Bonn, Germany
| | - T V RajanBabu
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, OH 43210, USA
| | - William A Nugent
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, OH 43210, USA
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12
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Yang W, Chen C, Chan KS. Hydrodebromination of allylic and benzylic bromides with water catalyzed by a rhodium porphyrin complex. Dalton Trans 2018; 47:12879-12883. [PMID: 30168570 DOI: 10.1039/c8dt02168f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Hydrodebromination of allylic and benzylic bromides was successfully achieved by a rhodium porphyrin complex catalyst using water as the hydrogen source without a sacrificial reductant. Mechanistic investigations suggest that bromine atom abstraction via a rhodium porphyrin metalloradical operates to give the rhodium porphyrin alkyl species and the subsequent hydrolysis of the rhodium porphyrin alkyl species to a hydrocarbon product is a key step to harness the hydrogen from water.
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Affiliation(s)
- Wu Yang
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, People's Republic of China.
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13
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Martínez AR, Rodríguez MC, Rodríguez-García I, Morales LP, Maecker RNR. Titanocene dichloride: A new green reagent in organic chemistry. CHINESE JOURNAL OF CATALYSIS 2017. [DOI: 10.1016/s1872-2067(17)62894-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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14
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Tam CM, To CT, Chan KS. Ligand effect on the rhodium porphyrin catalyzed hydrogenation of [2.2]paracyclophane with water: key bimetallic hydrogenation. Dalton Trans 2017; 46:10057-10063. [PMID: 28731122 DOI: 10.1039/c7dt02002c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Rhodium porphyrin catalyzed hydrogenation of the aliphatic carbon-carbon σ-bond of [2.2]paracyclophane with water has been examined with a variety of tetraarylporphyrins and axial ligands. Mechanistic investigations show that RhIII(ttp)H, which can be derived from the reaction of [RhII(ttp)]2 with water without a sacrificial reductant, plays an important role in promoting bimetallic reductive elimination to give the hydrogenation product.
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Affiliation(s)
- Chun Meng Tam
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, People's Republic of China.
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15
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Castro Rodríguez M, Rodríguez García I, Rodríguez Maecker RN, Pozo Morales L, Oltra JE, Rosales Martínez A. Cp2TiCl: An Ideal Reagent for Green Chemistry? Org Process Res Dev 2017. [DOI: 10.1021/acs.oprd.7b00098] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- María Castro Rodríguez
- Department
of Chemical Engineering, Escuela Politécnica Superior, University of Sevilla, 41011 Sevilla, Spain
| | | | | | - Laura Pozo Morales
- Department
of Chemical Engineering, Escuela Politécnica Superior, University of Sevilla, 41011 Sevilla, Spain
| | - J. Enrique Oltra
- Department
of Organic Chemistry, Faculty of Science, University of Granada, 18071 Granada, Spain
| | - Antonio Rosales Martínez
- Department
of Chemical Engineering, Escuela Politécnica Superior, University of Sevilla, 41011 Sevilla, Spain
- Petrochemical
Engineering, Universidad de las Fuerzas Armadas-ESPE, 050150 Latacunga, Ecuador
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16
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Zweig JE, Kim DE, Newhouse TR. Methods Utilizing First-Row Transition Metals in Natural Product Total Synthesis. Chem Rev 2017; 117:11680-11752. [PMID: 28525261 DOI: 10.1021/acs.chemrev.6b00833] [Citation(s) in RCA: 138] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
First-row transition-metal-mediated reactions constitute an important and growing area of research due to the low cost, low toxicity, and exceptional synthetic versatility of these metals. Currently, there is considerable effort to replace existing precious-metal-catalyzed reactions with first-row analogs. More importantly, there are a plethora of unique transformations mediated by first-row metals, which have no classical second- or third-row counterpart. Herein, the application of first-row metal-mediated methods to the total synthesis of natural products is discussed. This Review is intended to highlight strategic uses of these metals to realize efficient syntheses and highlight the future potential of these reagents and catalysts in organic synthesis.
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Affiliation(s)
- Joshua E Zweig
- Department of Chemistry, Yale University , 275 Prospect Street, New Haven, Connecticut 06520-8107, United States
| | - Daria E Kim
- Department of Chemistry, Yale University , 275 Prospect Street, New Haven, Connecticut 06520-8107, United States
| | - Timothy R Newhouse
- Department of Chemistry, Yale University , 275 Prospect Street, New Haven, Connecticut 06520-8107, United States
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17
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Jaraíz M, Enríquez L, Pinacho R, Rubio JE, Lesarri A, López-Pérez JL. A DFT-Based Computational-Experimental Methodology for Synthetic Chemistry: Example of Application to the Catalytic Opening of Epoxides by Titanocene. J Org Chem 2017; 82:3760-3766. [PMID: 28288276 DOI: 10.1021/acs.joc.7b00220] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A novel DFT-based Reaction Kinetics (DFT-RK) simulation approach, employed in combination with real-time data from reaction monitoring instrumentation (like UV-vis, FTIR, Raman, and 2D NMR benchtop spectrometers), is shown to provide a detailed methodology for the analysis and design of complex synthetic chemistry schemes. As an example, it is applied to the opening of epoxides by titanocene in THF, a catalytic system with abundant experimental data available. Through a DFT-RK analysis of real-time IR data, we have developed a comprehensive mechanistic model that opens new perspectives to understand previous experiments. Although derived specifically from the opening of epoxides, the prediction capabilities of the model, built on elementary reactions, together with its practical side (reaction kinetics simulations of real experimental conditions) make it a useful simulation tool for the design of new experiments, as well as for the conception and development of improved versions of the reagents. From the perspective of the methodology employed, because both the computational (DFT-RK) and the experimental (spectroscopic data) components can follow the time evolution of several species simultaneously, it is expected to provide a helpful tool for the study of complex systems in synthetic chemistry.
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Affiliation(s)
- Martín Jaraíz
- Department of Electronics, ETSIT, University of Valladolid , Paseo Belén 15, Valladolid 47011, Spain
| | - Lourdes Enríquez
- Department of Electronics, ETSIT, University of Valladolid , Paseo Belén 15, Valladolid 47011, Spain
| | - Ruth Pinacho
- Department of Electronics, ETSIT, University of Valladolid , Paseo Belén 15, Valladolid 47011, Spain
| | - José E Rubio
- Department of Electronics, ETSIT, University of Valladolid , Paseo Belén 15, Valladolid 47011, Spain
| | - Alberto Lesarri
- Department of Physical Chemistry and Inorganic Chemistry, Faculty of Sciences, University of Valladolid , Paseo Belén 7, Valladolid 47011, Spain
| | - José L López-Pérez
- Department of Pharmaceutical Sciences - IBSAL-CIETUS, University of Salamanca , Avda. Campo Charro s/n, Salamanca 37071, Spain.,Department of Pharmacology, Faculty of Medicine, University of Panama , Panama City, Panama
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18
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Rosales A, Rodríguez-García I. Cp2TiCl/D2O/Mn, a formidable reagent for the deuteration of organic compounds. Beilstein J Org Chem 2016; 12:1585-9. [PMID: 27559410 PMCID: PMC4979672 DOI: 10.3762/bjoc.12.154] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Accepted: 07/13/2016] [Indexed: 11/25/2022] Open
Abstract
Cp2TiCl/D2O/Mn is an efficient combination, sustainable and cheap reagent that mediates the D-atom transfer from D2O to different functional groups and can contribute to the synthesis of new deuterated organic compounds under friendly experimental conditions and with great economic advantages.
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Affiliation(s)
- Antonio Rosales
- Department of Chemical and Environmental Engineering, Escuela Politécnica Superior, University of Sevilla, 41011 Sevilla, Spain; Petrochemical Engineering, Universidad de las Fuerzas Armadas-ESPE, 050150 Latacunga, Ecuador
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19
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Yang ZJ, Ge WZ, Li QY, Lu Y, Gong JM, Kuang BJ, Xi X, Wu H, Zhang Q, Chen Y. Syntheses and Biological Evaluation of Costunolide, Parthenolide, and Their Fluorinated Analogues. J Med Chem 2015; 58:7007-20. [PMID: 26226279 DOI: 10.1021/acs.jmedchem.5b00915] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Inspired by the biosynthesis of sesquiterpene lactones (SLs), herein we report the asymmetric total synthesis of the germacrane ring (24). The synthetic strategy features a selective aldol reaction between β,γ-unsaturated chiral sulfonylamide 15a and aldehyde 13, as well as the intramolecular α-alkylation of sulfone 21 to construct a 10-membered carbocylic ring. The key intermediate 24 can be used to prepare the natural products costunolide and parthenolide (PTL), which are the key precursors for transformation into other SLs. Furthermore, the described synthetic sequences are amenable to the total synthesis of SL analogues, such as trifluoromethylated analogues 32 and 45. Analogues 32 and 45 maintained high activities against a series of cancer cell lines compared to their parent PTL and costunolide, respectively. In addition, 32 showed enhanced tolerance to acidic media compared with PTL. To our surprise, PTL and 32 showed comparable half-lives in rat plasma and in the presence of human liver microsomes.
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Affiliation(s)
- Zhong-Jin Yang
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), and Tianjin Key Laboratory of Molecular Drug Research, Nankai University , 94 Weijin Road, Nankai District, Tianjin 300071, People's Republic of China
| | - Wei-Zhi Ge
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), and Tianjin Key Laboratory of Molecular Drug Research, Nankai University , 94 Weijin Road, Nankai District, Tianjin 300071, People's Republic of China
| | - Qiu-Ying Li
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), and Tianjin Key Laboratory of Molecular Drug Research, Nankai University , 94 Weijin Road, Nankai District, Tianjin 300071, People's Republic of China
| | - Yaxin Lu
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), and Tianjin Key Laboratory of Molecular Drug Research, Nankai University , 94 Weijin Road, Nankai District, Tianjin 300071, People's Republic of China
| | - Jian-Miao Gong
- Accendatech Company, Ltd. , Tianjin 300384, People's Republic of China
| | - Bei-Jia Kuang
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), and Tianjin Key Laboratory of Molecular Drug Research, Nankai University , 94 Weijin Road, Nankai District, Tianjin 300071, People's Republic of China
| | - Xiaonan Xi
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), and Tianjin Key Laboratory of Molecular Drug Research, Nankai University , 94 Weijin Road, Nankai District, Tianjin 300071, People's Republic of China.,Tianjin International Joint Academy of Biomedicine , Tianjin 300457, People's Republic of China
| | - Haiting Wu
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), and Tianjin Key Laboratory of Molecular Drug Research, Nankai University , 94 Weijin Road, Nankai District, Tianjin 300071, People's Republic of China.,Tianjin International Joint Academy of Biomedicine , Tianjin 300457, People's Republic of China
| | - Quan Zhang
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), and Tianjin Key Laboratory of Molecular Drug Research, Nankai University , 94 Weijin Road, Nankai District, Tianjin 300071, People's Republic of China
| | - Yue Chen
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), and Tianjin Key Laboratory of Molecular Drug Research, Nankai University , 94 Weijin Road, Nankai District, Tianjin 300071, People's Republic of China
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20
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Rosales A, Rodríguez-García I, Muñoz-Bascón J, Roldan-Molina E, Padial NM, Morales LP, García-Ocaña M, Oltra JE. The Nugent Reagent: A Formidable Tool in Contemporary Radical and Organometallic Chemistry. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500292] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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21
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Fernández-Mateos A, Madrazo SE, Teijón PH, González RR. Radical Cyclization of Epoxy Vinyl- and Allylsulfones Promoted by Titanocene Chloride. J Org Chem 2015; 80:4378-91. [DOI: 10.1021/acs.joc.5b00206] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- A. Fernández-Mateos
- Departamento de
Química
Orgánica, Facultad de CC, Químicas, Universidad de Salamanca, Plaza de los Caídos 1-5, 37008 Salamanca, Spain
| | - S. Encinas Madrazo
- Departamento de
Química
Orgánica, Facultad de CC, Químicas, Universidad de Salamanca, Plaza de los Caídos 1-5, 37008 Salamanca, Spain
| | - P. Herrero Teijón
- Departamento de
Química
Orgánica, Facultad de CC, Químicas, Universidad de Salamanca, Plaza de los Caídos 1-5, 37008 Salamanca, Spain
| | - R. Rubio González
- Departamento de
Química
Orgánica, Facultad de CC, Químicas, Universidad de Salamanca, Plaza de los Caídos 1-5, 37008 Salamanca, Spain
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22
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Rosales A, Muñoz-Bascón J, Roldan-Molina E, Rivas-Bascón N, Padial NM, Rodríguez-Maecker R, Rodríguez-García I, Oltra JE. Synthesis of (±)-aureol by bioinspired rearrangements. J Org Chem 2015; 80:1866-70. [PMID: 25591135 DOI: 10.1021/jo502841u] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A bioinspired and sustainable procedure for the straightforward synthesis of (±)-aureol has been achieved in eight steps (14% overall yield) from epoxyfarnesol. The key steps are the titanocene(III)-catalyzed radical cascade cyclization of an epoxyfarnesol derivative and a biosynthetically inspired sequence of 1,2-hydride and methyl shifts.
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Affiliation(s)
- Antonio Rosales
- Department of Organic Chemistry, Faculty of Sciences, University of Granada , 18071 Granada, Spain
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23
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Giglio BC, Alexanian EJ. Alkene Hydrofunctionalization Using Hydroxamic Acids: A Radical-Mediated Approach to Alkene Hydration. Org Lett 2014; 16:4304-7. [DOI: 10.1021/ol5020202] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Benjamin C. Giglio
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Erik J. Alexanian
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
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24
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Rosales A, Muñoz-Bascón J, Roldan-Molina E, Castañeda MA, Padial NM, Gansäuer A, Rodríguez-García I, Oltra JE. Selective Reduction of Aromatic Ketones in Aqueous Medium Mediated by Ti(III)/Mn: A Revised Mechanism. J Org Chem 2014; 79:7672-6. [DOI: 10.1021/jo501141y] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Antonio Rosales
- Centro
de Investigación, Estudios y Desarrollo de Ingeniería
(CIEDI); Ingeniería Agroindustrial y Alimentos, Universidad de las Américas, 170513 Quito, Ecuador
| | - Juan Muñoz-Bascón
- Departamento
Química Orgánica, Facultad de Ciencias, Universidad de Granada, Campus Fuentenueva s/n, 18071 Granada, Spain
| | - Esther Roldan-Molina
- Departamento
Química Orgánica, Facultad de Ciencias, Universidad de Granada, Campus Fuentenueva s/n, 18071 Granada, Spain
| | - Mayra A. Castañeda
- Centro
de Investigación, Estudios y Desarrollo de Ingeniería
(CIEDI); Ingeniería Agroindustrial y Alimentos, Universidad de las Américas, 170513 Quito, Ecuador
| | - Natalia M. Padial
- Departamento
Química Orgánica, Facultad de Ciencias, Universidad de Granada, Campus Fuentenueva s/n, 18071 Granada, Spain
| | - Andreas Gansäuer
- Kekulé-Institut
für Organische Chemie und Biochemie, Universität Bonn, Gerhard-Domagk-Strasse 1, 53127 Bonn, Germany
| | | | - J. Enrique Oltra
- Departamento
Química Orgánica, Facultad de Ciencias, Universidad de Granada, Campus Fuentenueva s/n, 18071 Granada, Spain
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25
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Abstract
Important biomimetic steps in natural product synthesis have been promoted by transition metals, as exemplified by this beautiful ruthenium-catalyzed rearrangement of an endoperoxide into elysiapyrone A. Such reactions are supposed to occur during the biosynthesis, yet under different catalysis conditions.
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Affiliation(s)
- Xu-Wen Li
- Muséum National d'Histoire Naturelle and Centre National de la Recherche Scientifique
- Unité “Molécules de Communication et Adaptation des Micro-organismes” (UMR 7245 CNRS-MNHN)
- 75005 Paris, France
| | - Bastien Nay
- Muséum National d'Histoire Naturelle and Centre National de la Recherche Scientifique
- Unité “Molécules de Communication et Adaptation des Micro-organismes” (UMR 7245 CNRS-MNHN)
- 75005 Paris, France
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26
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Muñoz-Bascón J, Hernández-Cervantes C, Padial NM, Álvarez-Corral M, Rosales A, Rodríguez-García I, Oltra JE. Ti-Catalyzed Straightforward Synthesis of Exocyclic Allenes. Chemistry 2013; 20:801-10. [DOI: 10.1002/chem.201304033] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Indexed: 11/10/2022]
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27
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Long J, Ding YH, Wang PP, Zhang Q, Chen Y. Protection-Group-Free Semisyntheses of Parthenolide and Its Cyclopropyl Analogue. J Org Chem 2013; 78:10512-8. [DOI: 10.1021/jo401606q] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Jing Long
- The State Key Laboratory
of Medicinal Chemical Biology, Synergetic Innovation Center of Chemical
Science and Engineering (Tianjin), College of Pharmacy, and Tianjin
Key Laboratory of Molecular Drug Research, Nankai University, Tianjin 300071, People’s Republic of China
| | - Ya-Hui Ding
- Accendatech Co., Ltd., Tianjin 300384, People’s Republic of China
| | - Pan-Pan Wang
- The State Key Laboratory
of Medicinal Chemical Biology, Synergetic Innovation Center of Chemical
Science and Engineering (Tianjin), College of Pharmacy, and Tianjin
Key Laboratory of Molecular Drug Research, Nankai University, Tianjin 300071, People’s Republic of China
| | - Quan Zhang
- The State Key Laboratory
of Medicinal Chemical Biology, Synergetic Innovation Center of Chemical
Science and Engineering (Tianjin), College of Pharmacy, and Tianjin
Key Laboratory of Molecular Drug Research, Nankai University, Tianjin 300071, People’s Republic of China
| | - Yue Chen
- The State Key Laboratory
of Medicinal Chemical Biology, Synergetic Innovation Center of Chemical
Science and Engineering (Tianjin), College of Pharmacy, and Tianjin
Key Laboratory of Molecular Drug Research, Nankai University, Tianjin 300071, People’s Republic of China
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28
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Rossi B, Prosperini S, Pastori N, Clerici A, Punta C. New advances in titanium-mediated free radical reactions. Molecules 2012; 17:14700-32. [PMID: 23519248 PMCID: PMC6268425 DOI: 10.3390/molecules171214700] [Citation(s) in RCA: 46] [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: 10/31/2012] [Revised: 11/28/2012] [Accepted: 12/06/2012] [Indexed: 01/11/2023] Open
Abstract
Titanium complexes have been widely used as catalysts for C‑C bond-forming processes via free-radical routes. Herein we provide an overview of some of the most significant contributions in the field, that covers the last decade, emphasizing the key role played by titanium salts in the promotion of selective reactions aimed at the synthesis of multifunctional organic compounds, including nucleophilic radical additions to imines, pinacol and coupling reactions, ring opening of epoxides and living polymerization.
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Affiliation(s)
- Bianca Rossi
- Department of Chemistry, Materials, and Chemical Engineering “Giulio Natta”, Politecnico di Milano, P.zza Leonardo da Vinci 32, 20133 Milano, Italy; E-Mails: (B.R.); (S.P.); (N.P.); (A.C.)
| | - Simona Prosperini
- Department of Chemistry, Materials, and Chemical Engineering “Giulio Natta”, Politecnico di Milano, P.zza Leonardo da Vinci 32, 20133 Milano, Italy; E-Mails: (B.R.); (S.P.); (N.P.); (A.C.)
- INSTM (National Consortium for Materials Science and Technology) Local Unit, Politecnico di Milano, 20133 Milan, Italy
| | - Nadia Pastori
- Department of Chemistry, Materials, and Chemical Engineering “Giulio Natta”, Politecnico di Milano, P.zza Leonardo da Vinci 32, 20133 Milano, Italy; E-Mails: (B.R.); (S.P.); (N.P.); (A.C.)
| | - Angelo Clerici
- Department of Chemistry, Materials, and Chemical Engineering “Giulio Natta”, Politecnico di Milano, P.zza Leonardo da Vinci 32, 20133 Milano, Italy; E-Mails: (B.R.); (S.P.); (N.P.); (A.C.)
| | - Carlo Punta
- Department of Chemistry, Materials, and Chemical Engineering “Giulio Natta”, Politecnico di Milano, P.zza Leonardo da Vinci 32, 20133 Milano, Italy; E-Mails: (B.R.); (S.P.); (N.P.); (A.C.)
- INSTM (National Consortium for Materials Science and Technology) Local Unit, Politecnico di Milano, 20133 Milan, Italy
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29
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Muñoz-Bascón J, Sancho-Sanz I, Álvarez-Manzaneda E, Rosales A, Oltra JE. Highly Selective Barbier-Type Propargylations and Allenylations Catalyzed by Titanocene(III). Chemistry 2012; 18:14479-86. [DOI: 10.1002/chem.201201720] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Indexed: 11/06/2022]
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30
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Gansäuer A, Klatte M, Brändle GM, Friedrich J. Nachhaltige stereoselektive Radikalreduktion durch katalytischen H-Atom-Transfer (HAT). Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201202818] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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31
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Gansäuer A, Klatte M, Brändle GM, Friedrich J. Catalytic Hydrogen Atom Transfer (HAT) for Sustainable and Diastereoselective Radical Reduction. Angew Chem Int Ed Engl 2012; 51:8891-4. [DOI: 10.1002/anie.201202818] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2012] [Indexed: 11/07/2022]
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32
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Rosales A, Muñoz-Bascón J, López-Sánchez C, Álvarez-Corral M, Muñoz-Dorado M, Rodríguez-García I, Oltra JE. Ti-Catalyzed Homolytic Opening of Ozonides: A Sustainable C–C Bond-Forming Reaction. J Org Chem 2012; 77:4171-6. [DOI: 10.1021/jo300344a] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Antonio Rosales
- Department of Organic Chemistry, Faculty of Sciences, University of Granada, 18071 Granada, Spain
| | - Juan Muñoz-Bascón
- Department of Organic Chemistry, Faculty of Sciences, University of Granada, 18071 Granada, Spain
| | | | | | - Manuel Muñoz-Dorado
- Department of Organic Chemistry, University of Almería, 04120 Almería,
Spain
| | | | - J. Enrique Oltra
- Department of Organic Chemistry, Faculty of Sciences, University of Granada, 18071 Granada, Spain
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33
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Gansäuer A, Shi L, Otte M, Huth I, Rosales A, Sancho-Sanz I, Padial NM, Oltra JE. Hydrogen atom donors: recent developments. Top Curr Chem (Cham) 2011; 320:93-120. [PMID: 21452081 DOI: 10.1007/128_2011_124] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
This review highlights recent developments in the field of hydrogen atom transfer (HAT) reagents that circumvent the disadvantages of classical group 14 reagents, such as Bu₃SnH. Special emphasis is laid on the lowering of bond dissociation energies (BDEs) of molecules that could, as yet, not be used as HAT reagents and on the use of organometallic HAT reagents.
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Affiliation(s)
- Andreas Gansäuer
- Kekulé Institut für Organische Chemie und Biochemie der Universität Bonn, Germany.
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34
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Barrios-Francisco R, Benítez-Páez T, Flores-Alamo M, Arévalo A, García JJ. Nickel(0) Complexes with Fluorinated Alkyne Ligands and their Reactivity towards Semihydrogenation and Hydrodefluorination with Water. Chem Asian J 2010; 6:842-9. [DOI: 10.1002/asia.201000601] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2010] [Indexed: 11/06/2022]
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35
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Wang YF, Ni ZY, Dong M, Cong B, Shi QW, Gu YC, Kiyota H. Secondary Metabolites of Plants from the Genus Saussurea: Chemistry and Biological Activity. Chem Biodivers 2010; 7:2623-59. [DOI: 10.1002/cbdv.200900406] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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36
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Galán-Fernández R, Clemente-Tejeda D, Río-Nieto ED, Bermejo FA. Synthesis of diethyl 2-methyl-bicyclo[3.1.1]hept-2-ene-6,6-dicarboxylate by Pd-catalyzed intramolecular allylic alkylation. Stereoselective preparation of its optically homogeneous form from R-(−)-carvone. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.08.051] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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37
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Paradas M, Campaña AG, Jiménez T, Robles R, Oltra JE, Buñuel E, Justicia J, Cárdenas DJ, Cuerva JM. Understanding the Exceptional Hydrogen-Atom Donor Characteristics of Water in TiIII-Mediated Free-Radical Chemistry. J Am Chem Soc 2010; 132:12748-56. [DOI: 10.1021/ja105670h] [Citation(s) in RCA: 112] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Miguel Paradas
- Department of Organic Chemistry, Faculty of Sciences, University of Granada, Campus Fuentenueva s/n, E-18071 Granada, Spain, and Department of Organic Chemistry, Faculty of Sciences, Universidad Autónoma de Madrid, Cantoblanco E-28049, Madrid, Spain
| | - Araceli G. Campaña
- Department of Organic Chemistry, Faculty of Sciences, University of Granada, Campus Fuentenueva s/n, E-18071 Granada, Spain, and Department of Organic Chemistry, Faculty of Sciences, Universidad Autónoma de Madrid, Cantoblanco E-28049, Madrid, Spain
| | - Tania Jiménez
- Department of Organic Chemistry, Faculty of Sciences, University of Granada, Campus Fuentenueva s/n, E-18071 Granada, Spain, and Department of Organic Chemistry, Faculty of Sciences, Universidad Autónoma de Madrid, Cantoblanco E-28049, Madrid, Spain
| | - Rafael Robles
- Department of Organic Chemistry, Faculty of Sciences, University of Granada, Campus Fuentenueva s/n, E-18071 Granada, Spain, and Department of Organic Chemistry, Faculty of Sciences, Universidad Autónoma de Madrid, Cantoblanco E-28049, Madrid, Spain
| | - J. Enrique Oltra
- Department of Organic Chemistry, Faculty of Sciences, University of Granada, Campus Fuentenueva s/n, E-18071 Granada, Spain, and Department of Organic Chemistry, Faculty of Sciences, Universidad Autónoma de Madrid, Cantoblanco E-28049, Madrid, Spain
| | - Elena Buñuel
- Department of Organic Chemistry, Faculty of Sciences, University of Granada, Campus Fuentenueva s/n, E-18071 Granada, Spain, and Department of Organic Chemistry, Faculty of Sciences, Universidad Autónoma de Madrid, Cantoblanco E-28049, Madrid, Spain
| | - José Justicia
- Department of Organic Chemistry, Faculty of Sciences, University of Granada, Campus Fuentenueva s/n, E-18071 Granada, Spain, and Department of Organic Chemistry, Faculty of Sciences, Universidad Autónoma de Madrid, Cantoblanco E-28049, Madrid, Spain
| | - Diego J. Cárdenas
- Department of Organic Chemistry, Faculty of Sciences, University of Granada, Campus Fuentenueva s/n, E-18071 Granada, Spain, and Department of Organic Chemistry, Faculty of Sciences, Universidad Autónoma de Madrid, Cantoblanco E-28049, Madrid, Spain
| | - Juan M. Cuerva
- Department of Organic Chemistry, Faculty of Sciences, University of Granada, Campus Fuentenueva s/n, E-18071 Granada, Spain, and Department of Organic Chemistry, Faculty of Sciences, Universidad Autónoma de Madrid, Cantoblanco E-28049, Madrid, Spain
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Fernández-Mateos A, Madrazo SE, Teijón PH, González RR. Titanocene-Promoted Eliminations on Epoxy Alcohols and Epoxy Esters. European J Org Chem 2010. [DOI: 10.1002/ejoc.200901222] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Paradas M, Campaña AG, Marcos ML, Justicia J, Haidour A, Robles R, Cárdenas DJ, Oltra JE, Cuerva JM. Unprecedented H-atom transfer from water to ketyl radicals mediated by Cp2TiCl. Dalton Trans 2010; 39:8796-800. [DOI: 10.1039/c001689f] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Ghosh P, Cusick JR, Inghrim J, Williams LJ. Silyl-substituted spirodiepoxides: stereoselective formation and regioselective opening. Org Lett 2009; 11:4672-5. [PMID: 19810767 PMCID: PMC3047402 DOI: 10.1021/ol901948d] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A short synthesis of the natural product epi-citreodiol and the method developed to gain access to this target are described. Key advances focus on silyl substituted allenes. Upon exposure to dimethyldioxirane, spirodiepoxides form with high face selectivity and subsequently react at the silyl terminus.
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Affiliation(s)
| | | | - Jennifer Inghrim
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903
| | - Lawrence J. Williams
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903
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Fernández-Mateos A, Madrazo SE, Teijón PH, González RR. Titanocene-Promoted Intermolecular Couplings of Epoxides with Nitriles. An Easy Access to β-Hydroxyketones. J Org Chem 2009; 74:3913-8. [DOI: 10.1021/jo900479v] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- A. Fernández-Mateos
- Departamento de Química Orgánica, Facultad de CC. Químicas, Universidad de Salamanca, Plaza de los Caídos 1-5, 37008 Salamanca, Spain
| | - S. Encinas Madrazo
- Departamento de Química Orgánica, Facultad de CC. Químicas, Universidad de Salamanca, Plaza de los Caídos 1-5, 37008 Salamanca, Spain
| | - P. Herrero Teijón
- Departamento de Química Orgánica, Facultad de CC. Químicas, Universidad de Salamanca, Plaza de los Caídos 1-5, 37008 Salamanca, Spain
| | - R. Rubio González
- Departamento de Química Orgánica, Facultad de CC. Químicas, Universidad de Salamanca, Plaza de los Caídos 1-5, 37008 Salamanca, Spain
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Oh K, Knabe WE. Lewis acid-promoted electron transfer deoxygenation of epoxides, sulfoxides, and amine N-oxides: the role of low-valent niobium complexes from NbCl5 and Zn. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.02.013] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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44
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Estévez R, Justicia J, Bazdi B, Fuentes N, Paradas M, Choquesillo-Lazarte D, García-Ruiz J, Robles R, Gansäuer A, Cuerva J, Oltra J. Ti-Catalyzed Barbier-Type Allylations and Related Reactions. Chemistry 2009; 15:2774-91. [DOI: 10.1002/chem.200802180] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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45
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Barrios-Francisco R, García JJ. Stereoselective Hydrogenation of Aromatic Alkynes Using Water, Triethylsilane, or Methanol, Mediated and Catalyzed by Ni(0) Complexes. Inorg Chem 2008; 48:386-93. [DOI: 10.1021/ic801823x] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Juventino J. García
- Facultad de Química, Universidad Nacional Autónoma de México, México D. F. 04510, México
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46
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Ti-catalyzed transannular cyclization of epoxygermacrolides. Synthesis of antifungal (+)-tuberiferine and (+)-dehydrobrachylaenolide. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.08.114] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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47
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Jin J, Newcomb M. Rate Constants for Hydrogen Atom Transfer Reactions from Bis(cyclopentadienyl)titanium(III) Chloride-Complexed Water and Methanol to an Alkyl Radical. J Org Chem 2008; 73:7901-5. [PMID: 18800812 DOI: 10.1021/jo801869r] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jing Jin
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607
| | - Martin Newcomb
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607
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48
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Setzer WN. Ab initio analysis of the Cope rearrangement of germacrane sesquiterpenoids. J Mol Model 2008; 14:335-42. [PMID: 18274793 DOI: 10.1007/s00894-008-0274-3] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2007] [Accepted: 01/17/2008] [Indexed: 11/25/2022]
Abstract
The energetics of the Cope rearrangement of 17 germacrane sesquiterpenoids to their respective elemane forms have been calculated using both density functional theory (B3LYP/6-31G*) and post Hartee-Fock (MP2/6-31G**) ab initio methods. The calculations are in qualitative agreement with experimentally observed Cope rearrangements, but the two methods give slightly different results. MP2 calculations generally show more favorable elemene energies compared to the respective germacrenes (by around 3-4 kcal mol(-1)) and smaller activation energies (by 2-3 kcal mol(-1)). Additionally, neither method is accurate enough to consistently reproduce the germacrene/elemene equilibrium. Apparently, the generally small energy differences between the two forms in these sesquiterpenoids cannot be adequately reproduced at these levels of calculation.
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Affiliation(s)
- William N Setzer
- Department of Chemistry, University of Alabama in Huntsville, Huntsville, AL 35899, USA.
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49
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Gansäuer A, Justicia J, Fan CA, Worgull D, Piestert F. Reductive C–C Bond Formation after Epoxide Opening via Electron Transfer. Top Curr Chem (Cham) 2007. [DOI: 10.1007/128_2007_130] [Citation(s) in RCA: 122] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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50
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Cuerva J, Campaña A, Justicia J, Rosales A, Oller-López J, Robles R, Cárdenas D, Buñuel E, Oltra J. Water: The Ideal Hydrogen-Atom Source in Free-Radical Chemistry Mediated by TiIII and Other Single-Electron-Transfer Metals? Angew Chem Int Ed Engl 2007. [DOI: 10.1002/anie.200790043] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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