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Lee J, Grandner JM, Engle KM, Houk KN, Grubbs RH. In Situ Catalyst Modification in Atom Transfer Radical Reactions with Ruthenium Benzylidene Complexes. J Am Chem Soc 2016; 138:7171-7. [DOI: 10.1021/jacs.6b03767] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Juneyoung Lee
- Arnold
and Mabel Beckman Laboratories of Chemical Synthesis, Division of
Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Jessica M. Grandner
- Department
of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Keary M. Engle
- Arnold
and Mabel Beckman Laboratories of Chemical Synthesis, Division of
Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - K. N. Houk
- Department
of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Robert H. Grubbs
- Arnold
and Mabel Beckman Laboratories of Chemical Synthesis, Division of
Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
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Nada T, Yoneshige Y, Ii Y, Matsumoto T, Fujioka H, Shuto S, Arisawa M. Nonmetathesis Heterocycle Formation by Ruthenium-Catalyzed Intramolecular [2 + 2] Cycloaddition of Allenamide-enes to Azabicyclo[3.1.1]heptanes. ACS Catal 2016. [DOI: 10.1021/acscatal.6b00628] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tomomi Nada
- Faculty
of Pharmaceutical Sciences, Hokkaido University, Kita 12, Nishi 6, Kita-ku, Sapporo 060-0812, Japan
| | - Yusuke Yoneshige
- Graduate
School of Pharmaceutical Sciences, Osaka University, Yamada-oka
1-6, Suita, Osaka 565-0871, Japan
| | - Yasuhiro Ii
- Graduate
School of Pharmaceutical Sciences, Osaka University, Yamada-oka
1-6, Suita, Osaka 565-0871, Japan
| | - Takashi Matsumoto
- X-ray Research
Laboratory, Rigaku Corporation, 3-9-12 Matsubara-cho, Akishima, Tokyo 196-8666, Japan
| | - Hiromichi Fujioka
- Graduate
School of Pharmaceutical Sciences, Osaka University, Yamada-oka
1-6, Suita, Osaka 565-0871, Japan
| | - Satoshi Shuto
- Faculty
of Pharmaceutical Sciences, Hokkaido University, Kita 12, Nishi 6, Kita-ku, Sapporo 060-0812, Japan
| | - Mitsuhiro Arisawa
- Faculty
of Pharmaceutical Sciences, Hokkaido University, Kita 12, Nishi 6, Kita-ku, Sapporo 060-0812, Japan
- Graduate
School of Pharmaceutical Sciences, Osaka University, Yamada-oka
1-6, Suita, Osaka 565-0871, Japan
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Iqbal M, Raftery J, Quayle P. Crystal structure of catena-poly[hemi[1,3-bis-(2,6-diisoprop-ylphenyl)imidazolium] [[μ3-acetato-κ(3) O:O:O'-tri-μ2-acetato-κ(6) O:O'-dicopper(II)(Cu-Cu)]-μ-chlorido] di-chloro-methane sesqui-solvate]. Acta Crystallogr E Crystallogr Commun 2015; 71:m148-9. [PMID: 26396778 PMCID: PMC4571378 DOI: 10.1107/s2056989015013675] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Accepted: 07/18/2015] [Indexed: 11/11/2022]
Abstract
The title copper(II) complex, {(C27H37N2)[Cu4(CH3COO)8Cl]·3CH2Cl2} n , is a one-dimensional coordination polymer. The asymmetric unit is composed of a copper(II) tetra-acetate paddle-wheel complex, a Cl(-) anion situated on a twofold rotation axis, half a 1,3-bis-(2,6-diisoprop-ylphenyl)imidazolium cation (the whole mol-ecule being generated by twofold rotation symmetry) and one and a half of a di-chloro-methane solvent mol-ecule (one being located about a twofold rotation axis). The central metal-organic framework comprises of a tetra-nuclear copper(II) acetate 'paddle-wheel' complex which arises from the dimerization of the copper(II) tetra-acetate core comprising of three μ2-bidentate acetate and one μ3-tridentate acetate ligands per binuclear paddle-wheel complex. Both Cu(II) atoms of the binuclear component adopt a distorted square-pyramidal coordination geometry (τ = 0.04), with a Cu⋯Cu separation of 2.6016 (2) Å. The apical coordination site of one Cu(II) atom is occupied by an O atom of a neighbouring acetate bridge [Cu-O = 2.200 (2) Å], while that of the second Cu(II) atom is occupied by a bridging chloride ligand [Cu⋯Cl = 2.4364 (4) Å]. The chloride bridge is slightly bent with respect to the Cu⋯Cu inter-nuclear axis [Cu-Cl-Cu = 167.06 (6)°] and the tetra-nuclear units are located about a twofold rotation axis, forming the one-dimensional polymer that propagates along [101]. Charge neutrality is maintained by the inclusion of the 1,3-bis-(2,6-diisoprop-ylphenyl)imidazolium cation within the crystal lattice. In the crystal, the cation and di-chloro-methane solvent mol-ecules are linked to the coordin-ation polymer by various C-H⋯O and C-H⋯Cl hydrogen bonds. There are no other significant inter-molecular inter-actions present.
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Affiliation(s)
- Mohammad Iqbal
- School of Chemistry, University of Manchester, Manchester M13 9PL, UK
- Pakistan Institute of Nuclear Science and Technology, PO Box Nilore, Islamabad, Pakistan
| | - James Raftery
- School of Chemistry, University of Manchester, Manchester M13 9PL, UK
| | - Peter Quayle
- School of Chemistry, University of Manchester, Manchester M13 9PL, UK
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Diaba F, Martínez-Laporta A, Bonjoch J. Atom transfer radical cyclization of trichloroacetamides to electron-rich acceptors using Grubbs' catalysts: synthesis of the tricyclic framework of FR901483. J Org Chem 2014; 79:9365-72. [PMID: 25203675 DOI: 10.1021/jo501110c] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Intramolecular Kharasch-type additions of trichloroacetamides on anisole and enol acetates catalyzed by Grubbs' ruthenium carbenes are described. This protocol provides access to highly functionalized 2-azaspiro[4.5]decanes, morphan compounds, and the azatricyclic core of FR901483.
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Affiliation(s)
- Faïza Diaba
- Laboratori de Química Orgànica, Facultat de Farmàcia, IBUB, Universitat de Barcelona , Av. Joan XXIII s/n, 08028-Barcelona, Spain
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Fuwa H, Noguchi T, Noto K, Sasaki M. Tandem catalysis in domino olefin cross-metathesis/intramolecular oxa-conjugate cyclization: concise synthesis of 2,6-cis-substituted tetrahydropyran derivatives. Org Biomol Chem 2013; 10:8108-12. [PMID: 22948791 DOI: 10.1039/c2ob26189h] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Herein, we describe the concise synthesis of 2,6-cis-substituted tetrahydropyran derivatives based on a domino olefin cross-metathesis/intramolecular oxa-conjugate cyclization (CM/IOCC) reaction. We have found that the domino CM/IOCC of δ-hydroxy olefins with α,β-unsaturated carbonyl compounds (e.g., trans-crotonaldehyde or N-acryloyl-2,5-dimethylpyrrole) could be efficiently achieved in the presence of the second-generation Hoveyda-Grubbs catalyst under elevated temperature conditions, directly affording 2,6-cis-substituted tetrahydropyrans in excellent yields with synthetically useful diastereoselectivity ("auto-tandem catalysis"). In addition, we have found that the domino CM/IOCC of δ-hydroxy olefins with α,β-unsaturated carbonyl compounds could be achieved simply by performing CM in the presence of a Brønsted acid in CH(2)Cl(2) at 25-35 °C, which delivered 2,6-cis-substituted tetrahydropyrans in good yields with excellent diastereoselectivity ("orthogonal-tandem catalysis"). To understand the mechanism of auto-tandem catalysis in the domino CM/IOCC reaction, we have investigated the role of ruthenium hydride complexes in the IOCC of a ζ-hydroxy α,β-unsaturated ketone as a model case.
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Affiliation(s)
- Haruhiko Fuwa
- Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan.
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Kiefer G, Ruiz J, Solari E, Hilt G, Severin K. Ruthenium-Catalyzed Sequential Enyne Cross-Metathesis/ATRA Reactions. European J Org Chem 2011. [DOI: 10.1002/ejoc.201101263] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Kato H, Ishigame T, Oshima N, Hoshiya N, Shimawaki K, Arisawa M, Shuto S. One-Pot Ring-Closing Metathesis (RCM)/Oxidation by an Assisted Tandem Ruthenium Catalysis for the Synthesis of 2-Quinolones. Adv Synth Catal 2011. [DOI: 10.1002/adsc.201100303] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Muñoz‐Molina JM, Belderrain TR, Pérez PJ. Atom Transfer Radical Reactions as a Tool for Olefin Functionalization – On the Way to Practical Applications. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201100379] [Citation(s) in RCA: 103] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- José María Muñoz‐Molina
- Laboratorio de Catálisis Homogénea, Departamento de Química y Ciencia de los Materiales, Unidad Asociada al CSIC, Centro de Investigación en Química Sostenible (CIQSO), Campus de El Carmen s/n, Universidad de Huelva, 21007 Huelva, Spain
| | - Tomás R. Belderrain
- Laboratorio de Catálisis Homogénea, Departamento de Química y Ciencia de los Materiales, Unidad Asociada al CSIC, Centro de Investigación en Química Sostenible (CIQSO), Campus de El Carmen s/n, Universidad de Huelva, 21007 Huelva, Spain
| | - Pedro J. Pérez
- Laboratorio de Catálisis Homogénea, Departamento de Química y Ciencia de los Materiales, Unidad Asociada al CSIC, Centro de Investigación en Química Sostenible (CIQSO), Campus de El Carmen s/n, Universidad de Huelva, 21007 Huelva, Spain
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Radicals in transition metal catalyzed reactions? transition metal catalyzed radical reactions? - a fruitful interplay anyway: part 2. Radical catalysis by group 8 and 9 elements. Top Curr Chem (Cham) 2011; 320:191-322. [PMID: 22143610 DOI: 10.1007/128_2011_285] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
This review summarizes the current status of transition metal catalyzed reactions involving radical intermediates in organic chemistry. This part focuses on radical-based methods catalyzed by group 8 and group 9 metal complexes. Reductive and redox-neutral coupling methods catalyzed by low-valent metal complexes as well as catalytic oxidative C-C bond formations are reviewed.
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Fuwa H, Noto K, Sasaki M. Stereoselective Synthesis of Substituted Tetrahydropyrans via Domino Olefin Cross-Metathesis/Intramolecular Oxa-Conjugate Cyclization. Org Lett 2010; 12:1636-9. [DOI: 10.1021/ol100431m] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Haruhiko Fuwa
- Laboratory of Biostructural Chemistry, Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Kenkichi Noto
- Laboratory of Biostructural Chemistry, Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Makoto Sasaki
- Laboratory of Biostructural Chemistry, Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
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Shindoh N, Takemoto Y, Takasu K. Auto-Tandem Catalysis: A Single Catalyst Activating Mechanistically Distinct Reactions in a Single Reactor. Chemistry 2009; 15:12168-79. [DOI: 10.1002/chem.200901486] [Citation(s) in RCA: 234] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Alcaide B, Almendros P, Luna A. Grubbs' ruthenium-carbenes beyond the metathesis reaction: less conventional non-metathetic utility. Chem Rev 2009; 109:3817-58. [PMID: 19572654 DOI: 10.1021/cr9001512] [Citation(s) in RCA: 285] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Benito Alcaide
- Departamento de Química Orgánica I, Facultad de Química, Universidad Complutense de Madrid, 28040 Madrid, Spain.
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Bull JA, Luján C, Hutchings MG, Quayle P. Application of the BHQ benzannulation reaction to the synthesis of benzo-fused coumarins. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.03.077] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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C. Majumdar K, Muhuri S, Ul Islam R, Chattopadhyay B. Synthesis of Five- and Six-Membered Heterocyclic Compounds by the Application of the Metathesis Reactions. HETEROCYCLES 2009. [DOI: 10.3987/rev-08-646] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Bull JA, Hutchings MG, Luján C, Quayle P. New reactivity patterns of copper(I) and other transition metal NHC complexes: application to ATRC and related reactions. Tetrahedron Lett 2008. [DOI: 10.1016/j.tetlet.2007.12.084] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Thommes K, Içli B, Scopelliti R, Severin K. Atom-Transfer Radical Addition (ATRA) and Cyclization (ATRC) Reactions Catalyzed by a Mixture of [RuCl2Cp*(PPh3)] and Magnesium. Chemistry 2007; 13:6899-907. [PMID: 17546709 DOI: 10.1002/chem.200700442] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A new catalytic procedure for atom-transfer radical addition (ATRA) and cyclization (ATRC) reactions is described. The combination of the ruthenium(III) complex [RuCl(2)Cp*(PPh3)] (Cp*: pentamethylcyclopentadienyl) with magnesium allows these reactions to be performed under mild conditions with high efficiency. In most cases, the catalyst concentrations required are significantly lower than those used in previously reported procedures. It is suggested that magnesium acts as a reducing agent that generates and regenerates the catalytically active ruthenium(II) species. The precatalyst [RuCl(2)Cp*(PPh3)] has been analyzed by X-ray crystallography.
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Affiliation(s)
- Katrin Thommes
- Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
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Herndon JW. The chemistry of the carbon–transition metal double and triple bond: Annual survey covering the year 2005. Coord Chem Rev 2007. [DOI: 10.1016/j.ccr.2006.11.002] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Bull J, Hutchings M, Quayle P. A Remarkably Simple and Efficient Benzannulation Reaction. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200603416] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Bull JA, Hutchings MG, Quayle P. A Remarkably Simple and Efficient Benzannulation Reaction. Angew Chem Int Ed Engl 2007; 46:1869-72. [PMID: 17450613 DOI: 10.1002/anie.200603416] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- James A Bull
- School of Chemistry, University of Manchester, Manchester M13 9PL, UK
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Dragutan V, Dragutan I, Delaude L, Demonceau A. NHC–Ru complexes—Friendly catalytic tools for manifold chemical transformations. Coord Chem Rev 2007. [DOI: 10.1016/j.ccr.2006.09.002] [Citation(s) in RCA: 243] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Majumdar KC, Basu PK, Chattopadhyay SK. Formation of five- and six-membered heterocyclic rings under radical cyclisation conditions. Tetrahedron 2007. [DOI: 10.1016/j.tet.2006.09.049] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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A resourceful new strategy in organic synthesis: Tandem and stepwise metathesis/non-metathesis catalytic processes. J Organomet Chem 2006. [DOI: 10.1016/j.jorganchem.2006.08.012] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Edlin CD, Faulkner J, Fengas D, Helliwell M, Knight CK, House D, Parker J, Preece I, Quayle P, Raftery J, Richards SN. Toward catalyst economy: A programmed approach to the synthesis of bicyclic lactones and lactams. J Organomet Chem 2006. [DOI: 10.1016/j.jorganchem.2006.08.017] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Courchay FC, Sworen JC, Ghiviriga I, Abboud KA, Wagener KB. Understanding Structural Isomerization during Ruthenium-Catalyzed Olefin Metathesis: A Deuterium Labeling Study. Organometallics 2006. [DOI: 10.1021/om0509894] [Citation(s) in RCA: 106] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Florence C. Courchay
- The George and Josephine Butler Polymer Research Laboratory, Department of Chemistry, University of Florida, Gainesville, Florida 32611
| | - John C. Sworen
- The George and Josephine Butler Polymer Research Laboratory, Department of Chemistry, University of Florida, Gainesville, Florida 32611
| | - Ion Ghiviriga
- The George and Josephine Butler Polymer Research Laboratory, Department of Chemistry, University of Florida, Gainesville, Florida 32611
| | - Khalil A. Abboud
- The George and Josephine Butler Polymer Research Laboratory, Department of Chemistry, University of Florida, Gainesville, Florida 32611
| | - Kenneth B. Wagener
- The George and Josephine Butler Polymer Research Laboratory, Department of Chemistry, University of Florida, Gainesville, Florida 32611
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Schmidt B. Olefin metathesis and isomerization: From undesired side reactions to useful synthetic methodology. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.molcata.2006.03.026] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Alcaide B, Almendros P, Alonso JM. A practical ruthenium-catalyzed cleavage of the allyl protecting group in amides, lactams, imides, and congeners. Chemistry 2006; 12:2874-9. [PMID: 16419144 DOI: 10.1002/chem.200501227] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A convenient methodology for the deprotection of N-allylic amide-like moieties was developed. The first examples accounting for the ruthenium-catalyzed deallylation of amides, lactams, imides, pyrazolidones, hydantoins, and oxazolidinones have been achieved by the sequential use of Grubbs carbene (isomerization step) and RuCl(3) (oxidation step). A variety of substrates, including enantiopure multifunctional beta- and gamma-lactams, can be employed.
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Affiliation(s)
- Benito Alcaide
- Departamento de Química Orgánica I, Facultad de Química, Universidad Complutense de Madrid, 28040 Madrid, Spain.
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Edlin CD, Faulkner J, Helliwell M, Knight CK, Parker J, Quayle P, Raftery J. Atom transfer radical cyclization reactions (ATRC): synthetic applications. Tetrahedron 2006. [DOI: 10.1016/j.tet.2006.01.038] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Catalyst economy. Part 2: Sequential metathesis—Kharasch sequences using the Grubbs metathesis catalysts. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2005.12.018] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Ruthenium-catalyzed tandem ring closing metathesis (RCM) – atom transfer radical cyclization (ATRC) sequences. J Organomet Chem 2005. [DOI: 10.1016/j.jorganchem.2005.06.042] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Helliwell M, Fengas D, Knight CK, Parker J, Quayle P, Raftery J, Richards SN. Bifurcate, tandem ATRC reactions: towards 2-oxabicyclo[4.3.0]nonane core of eunicellins. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.08.104] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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