51
|
Kyne SH, Lévêque C, Zheng S, Fensterbank L, Jutand A, Ollivier C. Iron(II) catalyzed reductive radical cyclization reactions of bromoacetals in the presence of NaBH4: optimization studies and mechanistic insights. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.08.039] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
52
|
Goddard JP, Ollivier C, Fensterbank L. Photoredox Catalysis for the Generation of Carbon Centered Radicals. Acc Chem Res 2016; 49:1924-36. [PMID: 27529633 DOI: 10.1021/acs.accounts.6b00288] [Citation(s) in RCA: 199] [Impact Index Per Article: 24.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Radical chemistry has witnessed over the last decades important advances that have positioned it as a methodology of choice in synthetic chemistry. A number of great attributes such as specific reactivities, the knowledge of the kinetics of most elementary processes, the functional group tolerance, and the possibility to operate cascade sequences are clearly responsible for this craze. Nevertheless, at the end of the last century, radical chemistry appeared plagued by several hurdles to overcome such as the use of environmentally problematic mediators or the impossibility of scale up. While the concept of photocatalysis was firmly established in the coordination chemistry community, its diffusion in organic synthetic chemistry remained sporadic for decades until the end of the 2000s with the breakthrough merging of organocatalysis and photocatalysis by the MacMillan group and contemporary reports by the groups of Yoon and Stephenson. Since then, photoredox catalysis has enjoyed particularly active and intense developments. It is now the topic of a still increasing number of publications featuring various applications from asymmetric synthesis, total synthesis of natural products, and polymerization to process (flow) chemistry. In this Account, we survey our own efforts in this domain, focusing on the elaboration of new photocatalytic pathways that could lead to the efficient generation of C-centered functionalized alkyl and aryl radicals. Both reductive and oxidative manifolds are accessible through photoredox catalysis, which has guided us along these lines in our projects. Thus, we studied the photocatalytic reduction of onium salts such as sulfoniums and iodoniums for the production of the elusive aryl radical intermediates. Progressing to more relevant chemistry for synthesis, we examined the cleavage of C-O and the C-Br bonds for the generation of alkyl C-centered radicals. Activated epoxides could serve as valuable substrates of a photocatalyzed variant of the Nugent-RajanBabu-Gansäuer homolytic cleavage of epoxides. Using imidazole based carbamates, we could also devise the first photocatalyzed Barton-McCombie deoxygenation reaction. Finally, bromophenylacetate can be reduced using the [Au2(μ-dppm)2]Cl2 photocatalyst under UVA or visible-light. This was used for the initiation of the controlled atom transfer radical polymerization of methacrylates and acrylates in solution or laminate. Our next endeavors concerned the photocatalyzed oxidation of stabilized carbanions such as enolates of 1,3-dicarbonyl substrates, trifluoroborates, and more extensively bis-catecholato silicates. Because of their low oxidation potentials, the later have proved to be exquisite sources of radical entities, which can be engaged in diverse intermolecular reactions such as vinylation, alkynylation, and conjugate additions. The bis-catecholato silicates were also shown to behave as excellent partners of dual photoredox-nickel catalysis leading in an expeditious manner to libraries of cross coupling products.
Collapse
|
53
|
Jacquet J, Desage-El Murr M, Fensterbank L. Metal-Promoted Coupling Reactions Implying Ligand-Based Redox Changes. ChemCatChem 2016. [DOI: 10.1002/cctc.201600616] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
54
|
Guelen S, Blazejak M, Mouriès-Mansuy V, Fensterbank L. From Enynyl Esters to Functionalized Polycyclic Derivatives via Cycloisomerization and Post-Functionalization. SYNTHESIS-STUTTGART 2016. [DOI: 10.1055/s-0035-1561488] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
The post-functionalization of ketone products originating from the PtCl2-catalyzed cycloisomerization of enynyl esters is described. Post-functionalization is accomplished via diastereoselective alkylation, regioselective cyclopropane opening and regioselective Baeyer–Villiger and Beckmann rearrangements to provide functionalized polycycles.
Collapse
|
55
|
Jacquet J, Chaumont P, Gontard G, Orio M, Vezin H, Blanchard S, Desage-El Murr M, Fensterbank L. C−N Bond Formation from a Masked High-Valent Copper Complex Stabilized by Redox Non-Innocent Ligands. Angew Chem Int Ed Engl 2016; 55:10712-6. [DOI: 10.1002/anie.201605132] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Revised: 07/05/2016] [Indexed: 11/08/2022]
|
56
|
Jacquet J, Chaumont P, Gontard G, Orio M, Vezin H, Blanchard S, Desage-El Murr M, Fensterbank L. C−N Bond Formation from a Masked High-Valent Copper Complex Stabilized by Redox Non-Innocent Ligands. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201605132] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
57
|
Xia Z, Khaled O, Mouriès-Mansuy V, Ollivier C, Fensterbank L. Dual Photoredox/Gold Catalysis Arylative Cyclization of o-Alkynylphenols with Aryldiazonium Salts: A Flexible Synthesis of Benzofurans. J Org Chem 2016; 81:7182-90. [DOI: 10.1021/acs.joc.6b01060] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
58
|
Jaroschik F, Simonneau A, Lemière G, Cariou K, Agenet N, Amouri H, Aubert C, Goddard JP, Lesage D, Malacria M, Gimbert Y, Gandon V, Fensterbank L. Assessing Ligand and Counterion Effects in the Noble Metal Catalyzed Cycloisomerization Reactions of 1,6-Allenynes: a Combined Experimental and Theoretical Approach. ACS Catal 2016. [DOI: 10.1021/acscatal.5b02696] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
59
|
Barbazanges M, Caytan E, Lesage D, Aubert C, Fensterbank L, Gandon V, Ollivier C. Chiral Phosphate in Rhodium-Catalyzed Asymmetric [2+2+2] Cycloaddition: Ligand, Counterion, or Both? Chemistry 2016; 22:8553-8. [PMID: 27167983 DOI: 10.1002/chem.201601188] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2016] [Indexed: 11/08/2022]
Abstract
Investigations based on NMR spectroscopy, mass spectrometry, and DFT calculations shed light on the metallic species generated in the rhodium-catalyzed asymmetric [2+2+2] cycloaddition reaction between diynes and isocyanates with the chiral phosphate TRIP. The catalytic mixture comprising [{Rh(cod)Cl}2 ], 1,4-diphenylphosphinobutane (dppb), and Ag(S)-TRIP actually gives rise to two species, both having an effect on the stereoselectivity. One is a rhodium(I) complex in which TRIP is a weakly coordinating counterion, whereas the other is a bimetallic Rh/Ag complex in which TRIP is a strongly coordinating X-type ligand.
Collapse
|
60
|
Jacquet J, Blanchard S, Derat E, Desage-El Murr M, Fensterbank L. Redox-ligand sustains controlled generation of CF 3 radicals by well-defined copper complex. Chem Sci 2016; 7:2030-2036. [PMID: 29899928 PMCID: PMC5968567 DOI: 10.1039/c5sc03636d] [Citation(s) in RCA: 87] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2015] [Accepted: 11/27/2015] [Indexed: 01/17/2023] Open
Abstract
A well-defined copper complex bearing iminosemiquinone ligands performs single electron reduction of an electrophilic CF3+ source into CF˙3 radicals. This redox behavior is enabled by the ligand which shuttles through two different redox states (iminosemiquinone and iminobenzoquinone) while the copper center is preserved as a Cu(ii). This system was used in the trifluoromethylation of silyl enol ethers, heteroaromatics and in the hydrotrifluoromethylation of alkynes. This is the first example of cooperative redox catalysis for the controlled generation of CF˙3 radicals.
Collapse
|
61
|
Goddard JP, Ollivier C, Fensterbank L, Chenneberg L, Lévêque C, Corcé V, Baralle A. Single-Electron-Transfer Oxidation of Trifluoroborates and Silicates with Organic Reagents: A Comparative Study. Synlett 2016. [DOI: 10.1055/s-0035-1561337] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
62
|
Lévêque C, Chenneberg L, Corcé V, Goddard JP, Ollivier C, Fensterbank L. Primary alkyl bis-catecholato silicates in dual photoredox/nickel catalysis: aryl- and heteroaryl-alkyl cross coupling reactions. Org Chem Front 2016. [DOI: 10.1039/c6qo00014b] [Citation(s) in RCA: 69] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Primary alkyl bis-catecholato silicates have been successfully engaged with aryl and heteroaryl bromide substrates in photoredox/nickel dual catalysis to provide cross coupling products.
Collapse
|
63
|
Lévêque C, Chenneberg L, Corcé V, Ollivier C, Fensterbank L. Organic photoredox catalysis for the oxidation of silicates: applications in radical synthesis and dual catalysis. Chem Commun (Camb) 2016; 52:9877-80. [DOI: 10.1039/c6cc04636c] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Metal free photooxidation of alkyl bis(catecholato)silicates with the organic dye 1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyano-benzene (4CzIPN) allows the smooth formation of alkyl radicals.
Collapse
|
64
|
Vanitcha A, Damelincourt C, Gontard G, Vanthuyne N, Mouriès-Mansuy V, Fensterbank L. Bis-phosphine allene ligand: coordination chemistry and preliminary applications in catalysis. Chem Commun (Camb) 2016; 52:6785-8. [DOI: 10.1039/c6cc02316a] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
A 1,3-bis-diphenylphosphine allene provided new coordination complexes with palladium, platinum and gold salts. The dinuclear gold(i) complex gave promising results in asymmetric catalysis.
Collapse
|
65
|
Ferrand L, Das Neves N, Malacria M, Mouriès-Mansuy V, Ollivier C, Fensterbank L. Gold-catalyzed cycloisomerization of [3]-cumulenols. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2015.02.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
|
66
|
Corcé V, Chamoreau LM, Derat E, Goddard JP, Ollivier C, Fensterbank L. Frontispiz: Silicates as Latent Alkyl Radical Precursors: Visible-Light Photocatalytic Oxidation of Hypervalent Bis-Catecholato Silicon Compounds. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201583963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
67
|
Corcé V, Chamoreau L, Derat E, Goddard J, Ollivier C, Fensterbank L. Frontispiece: Silicates as Latent Alkyl Radical Precursors: Visible‐Light Photocatalytic Oxidation of Hypervalent Bis‐Catecholato Silicon Compounds. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/anie.201583963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
68
|
Augé M, Feraldi-Xypolia A, Barbazanges M, Aubert C, Fensterbank L, Gandon V, Kolodziej E, Ollivier C. Double-Stereodifferentiation in Rhodium-Catalyzed [2 + 2 + 2] Cycloaddition: Chiral Ligand/Chiral Counterion Matched Pair. Org Lett 2015. [DOI: 10.1021/acs.orglett.5b01738] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
69
|
Corcé V, Chamoreau LM, Derat E, Goddard JP, Ollivier C, Fensterbank L. Silicates as Latent Alkyl Radical Precursors: Visible-Light Photocatalytic Oxidation of Hypervalent Bis-Catecholato Silicon Compounds. Angew Chem Int Ed Engl 2015. [PMID: 26216069 DOI: 10.1002/anie.201504963] [Citation(s) in RCA: 220] [Impact Index Per Article: 24.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
This works introduces hypervalent bis-catecholato silicon compounds as versatile sources of alkyl radicals upon visible-light photocatalysis. Using Ir[(dF(CF3)ppy)2(bpy)](PF6) (dF(CF3)ppy = 2-(2,4-difluorophenyl)-5-trifluoromethylpyridine, bpy = bipyridine) as catalytic photooxidant, a series of alkyl radicals, including highly reactive primary ones can be generated and engaged in various intermolecular homolytic reactions. Based on cyclic voltammetry, Stern-Volmer studies, and supported by calculations, a mechanism involving a single-electron transfer from the silicate to the photoactivated iridium complex has been proposed. This oxidative photocatalyzed process can be efficiently merged with nickel-catalyzed Csp2-Csp3 cross-coupling reactions.
Collapse
|
70
|
Corcé V, Chamoreau LM, Derat E, Goddard JP, Ollivier C, Fensterbank L. Silicates as Latent Alkyl Radical Precursors: Visible-Light Photocatalytic Oxidation of Hypervalent Bis-Catecholato Silicon Compounds. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201504963] [Citation(s) in RCA: 77] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
71
|
Vanitcha A, Gontard G, Vanthuyne N, Derat E, Mouriès-Mansuy V, Fensterbank L. Synthesis of Allenes Bearing Phosphine Oxide Groups and Investigation of Their Reactivity toward Gold Complexes. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201500345] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
|
72
|
Lenormand H, Corcé V, Sorin G, Chhun C, Chamoreau LM, Krim L, Zins EL, Goddard JP, Fensterbank L. Versatile Access to Martin’s Spirosilanes and Their Hypervalent Derivatives. J Org Chem 2015; 80:3280-8. [DOI: 10.1021/jo5028497] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
73
|
Nzulu F, Telitel S, Stoffelbach F, Graff B, Morlet-Savary F, Lalevée J, Fensterbank L, Goddard JP, Ollivier C. A dinuclear gold(i) complex as a novel photoredox catalyst for light-induced atom transfer radical polymerization. Polym Chem 2015. [DOI: 10.1039/c5py00435g] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The highly active photocatalyst [Au2(dppm)2]Cl2 is able to efficiently promote controlled/living photoATRP of acrylates and methacrylates.
Collapse
|
74
|
Fensterbank L, Aubert C. Editorial: Max Malacria 65th birthday special issue. Org Chem Front 2014. [DOI: 10.1039/c4qo90034k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
75
|
Nzulu F, Bontemps A, Robert J, Barbazanges M, Fensterbank L, Goddard JP, Malacria M, Ollivier C, Petit M, Rieger J, Stoffelbach F. Gold-Catalyzed Polymerization Based on Carbene Polycyclopropanation. Macromolecules 2014. [DOI: 10.1021/ma501516s] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
|