101
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Maestri G, Larraufie MH, Ollivier C, Malacria M, Fensterbank L, Lacôte E. Rearrangements of N-Acyl Isothioureas. Alternate Access to Acylguanidines from Cyanamides. Org Lett 2012; 14:5538-41. [DOI: 10.1021/ol3026439] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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102
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Benedetti E, Penoni A, Lomazzi M, Tibiletti F, Goddard JP, Fensterbank L, Malacria M, Palmisano G. Synthesis of Nitrogen-Containing Heterocycles via Ring-Closing Ene-Ene and Ene-Yne Metathesis Reactions: An Easy Access to 1- and 2-Benzazepine Scaffolds and Five- and Six-Membered Lactams. SYNTHESIS-STUTTGART 2012. [DOI: 10.1055/s-0032-1317352] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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103
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Dupré N, Brazel C, Fensterbank L, Malacria M, Thorimbert S, Hasenknopf B, Lacôte E. Self-Buffering Hybrid Gold-Polyoxometalate Catalysts for the Catalytic Cyclization of Acid-Sensitive Substrates. Chemistry 2012; 18:12962-5. [DOI: 10.1002/chem.201201007] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2012] [Indexed: 11/07/2022]
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104
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Fensterbank L, Goddard JP, Malacria M, Ollivier C. Homolytic Reduction of Onium Salts. Chimia (Aarau) 2012; 66:425-32. [DOI: 10.2533/chimia.2012.425] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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105
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Ekomié A, Lefèvre G, Fensterbank L, Lacôte E, Malacria M, Ollivier C, Jutand A. Iron-Catalyzed Reductive Radical Cyclization of Organic Halides in the Presence of NaBH4: Evidence of an Active Hydrido Iron(I) Catalyst. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201200589] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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106
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Ekomié A, Lefèvre G, Fensterbank L, Lacôte E, Malacria M, Ollivier C, Jutand A. Iron-Catalyzed Reductive Radical Cyclization of Organic Halides in the Presence of NaBH4: Evidence of an Active Hydrido Iron(I) Catalyst. Angew Chem Int Ed Engl 2012; 51:6942-6. [DOI: 10.1002/anie.201200589] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2012] [Revised: 05/03/2012] [Indexed: 11/11/2022]
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107
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Fukuyama T, Ohta Y, Brancour C, Miyagawa K, Ryu I, Dhimane AL, Fensterbank L, Malacria M. Rh-Catalyzed [5+1] and [4+1] Cycloaddition Reactions of 1,4-Enyne Esters with CO: A Shortcut to Functionalized Resorcinols and Cyclopentenones. Chemistry 2012; 18:7243-7. [PMID: 22505021 DOI: 10.1002/chem.201200045] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2012] [Indexed: 11/08/2022]
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108
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Fensterbank L, Lacôte E, Larraufie MH, Maestri G, Malacria M, Ollivier C. The Cyanamide Moiety, Synthesis and Reactivity. SYNTHESIS-STUTTGART 2012. [DOI: 10.1055/s-0031-1289749] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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109
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Fensterbank L, Goddard JP, Lacôte E, Zhao Q, Curran D, Malacria M. NHC-Catalyzed Chemo- and Regioselective Hydrosilylation of Carbonyl Derivatives. Synlett 2012. [DOI: 10.1055/s-0031-1290208] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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110
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Tehfe MA, Monot J, Malacria M, Fensterbank L, Fouassier JP, Curran DP, Lacôte E, Lalevée J. A Water-Compatible NHC-Borane: Photopolymerizations in Water and Rate Constants for Elementary Radical Reactions. ACS Macro Lett 2012; 1:92-95. [PMID: 35578461 DOI: 10.1021/mz200087g] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Rate constants for important elementary reactions of 2,4-dimethyl-1,2,4-triazol-3-ylidene borane (1) and its derived boryl radical have been measured in the presence and absence of water. Reactions including H-abstraction by tBuO•, and onward reactions of the derived radical with methyl acrylate (addition), iodopropane (halogen abstraction), and an iodonium salt (oxidation) are unaffected by the presence of a high concentration (1.5 M) of water. Extending these results, borane (1) has been found to be an efficient new co-initiator for the visible light photopolymerization of monomers in the presence of both air and water.
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111
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Neves AC, Aitken HM, Kyne SH, Fensterbank L, Lacôte E, Malacria M, Ollivier C, Schiesser CH. Intramolecular homolytic substitution of seleninates – a computational study. Tetrahedron 2012. [DOI: 10.1016/j.tet.2011.10.037] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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112
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Blanchard S, Derat E, Desage‐El Murr M, Fensterbank L, Malacria M, Mouriès‐Mansuy V. Non‐Innocent Ligands: New Opportunities in Iron Catalysis. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201100985] [Citation(s) in RCA: 136] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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113
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Barbazanges M, Augé M, Moussa J, Amouri H, Aubert C, Desmarets C, Fensterbank L, Gandon V, Malacria M, Ollivier C. Enantioselective Ir(I)-catalyzed carbocyclization of 1,6-enynes by the chiral counterion strategy. Chemistry 2011; 17:13789-94. [PMID: 22052592 DOI: 10.1002/chem.201102723] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2011] [Indexed: 11/11/2022]
Abstract
Enantioenriched bicyclo[4.1.0]hept-2-enes were synthesized by Ir(I)-catalyzed carbocyclization of 1,6-enynes. No chiral ligands were used, CO and PPh(3) were the only ligands bound to iridium. Instead, the stereochemical information was localized on the counterion of the catalyst, generated in situ by reaction of Vaska's complex (trans-[IrCl(CO)(PPh(3))(2)]) with a chiral silver phosphate. Enantiomeric excesses up to 93% were obtained when this catalytic mixture was used. (31)P NMR and IR spectroscopy suggest that formation of the trans- [Ir(CO)(PPh(3))(2)](+) moiety occurs by chlorine abstraction. Moreover, density functional theory calculations support a 6-endo-dig cyclization promoted by this cationic moiety. The chiral phosphate anion (O-P*) controls the enantioselectivity through formation of a loose ion pair with the metal center and establishes a C-H···O-P* hydrogen bond with the substrate. This is a rare example of asymmetric counterion-directed transition-metal catalysis and represents the first application of such a strategy to a C-C bond-forming reaction.
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114
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Curran DP, Solovyev A, Makhlouf Brahmi M, Fensterbank L, Malacria M, Lacôte E. Cover Picture: Synthesis and Reactions of N-Heterocyclic Carbene Boranes (Angew. Chem. Int. Ed. 44/2011). Angew Chem Int Ed Engl 2011. [DOI: 10.1002/anie.201105618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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115
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Curran DP, Solovyev A, Makhlouf Brahmi M, Fensterbank L, Malacria M, Lacôte E. Titelbild: Komplexe von N-heterocyclischen Carbenen mit Boranen: Synthese und Reaktionen (Angew. Chem. 44/2011). Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201105618] [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]
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116
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Larraufie MH, Maestri G, Beaume A, Derat É, Ollivier C, Fensterbank L, Courillon C, Lacôte E, Catellani M, Malacria M. Exception to the ortho Effect in Palladium/Norbornene Catalysis. Angew Chem Int Ed Engl 2011; 50:12253-6. [DOI: 10.1002/anie.201104356] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2011] [Revised: 08/24/2011] [Indexed: 11/10/2022]
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117
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Larraufie MH, Maestri G, Beaume A, Derat É, Ollivier C, Fensterbank L, Courillon C, Lacôte E, Catellani M, Malacria M. Exception to the ortho Effect in Palladium/Norbornene Catalysis. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201104356] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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118
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Simonneau A, Garcia P, Goddard JP, Mouriès-Mansuy V, Malacria M, Fensterbank L. Combination of gold catalysis and Selectfluor for the synthesis of fluorinated nitrogen heterocycles. Beilstein J Org Chem 2011; 7:1379-86. [PMID: 22043249 PMCID: PMC3201052 DOI: 10.3762/bjoc.7.162] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2011] [Accepted: 09/14/2011] [Indexed: 11/30/2022] Open
Abstract
We herein report the synthesis of 3-fluoro-2-methylene-pyrrolidine (3a) and -piperidine (3b) from 1,5- and 1,6-aminoalkynes, respectively, using a combination of a gold-catalyzed hydroamination reaction followed by electrophilic trapping of an intermediate cyclic enamine by Selectfluor. Careful attention was paid to the elucidation of the mechanism and Selectfluor was suggested to play the double role of promoting the oxidation of gold(I) to a gold(III) active species and also the electrophilic fluorination of the enamine intermediates.
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119
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Curran DP, Solovyev A, Makhlouf Brahmi M, Fensterbank L, Malacria M, Lacôte E. Synthesis and reactions of N-heterocyclic carbene boranes. Angew Chem Int Ed Engl 2011; 50:10294-317. [PMID: 21898724 DOI: 10.1002/anie.201102717] [Citation(s) in RCA: 355] [Impact Index Per Article: 27.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2011] [Indexed: 11/10/2022]
Abstract
Boranes are widely used Lewis acids and N-heterocyclic carbenes (NHCs) are popular Lewis bases, so it is remarkable how little was known about their derived complexes until recently. NHC-boranes are typically readily accessible and many are so stable that they can be treated like organic compounds rather than complexes. They do not exhibit "borane chemistry", but instead are proving to have a rich chemistry of their own as reactants, as reagents, as initiators, and as catalysts. They have significant potential for use in organic synthesis and in polymer chemistry. They can be used to easily make unusual complexes with a broad spectrum of functional groups not usually seen in organoboron chemistry. Many of their reactions occur through new classes of reactive intermediates including borenium cations, boryl radicals, and even boryl anions. This Review provides comprehensive coverage of the synthesis, characterization, and reactions of NHC-boranes.
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120
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Curran DP, Solovyev A, Makhlouf Brahmi M, Fensterbank L, Malacria M, Lacôte E. Komplexe von N-heterocyclischen Carbenen mit Boranen: Synthese und Reaktionen. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201102717] [Citation(s) in RCA: 105] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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121
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Benedetti E, Simonneau A, Hours A, Amouri H, Penoni A, Palmisano G, Malacria M, Goddard JP, Fensterbank L. (Pentamethylcyclopentadienyl)Iridium Dichloride Dimer {[IrCp*Cl2]2}: A Novel Efficient Catalyst for the Cycloisomerizations of Homopropargylic Diols and N-Tethered Enynes. Adv Synth Catal 2011. [DOI: 10.1002/adsc.201100124] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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122
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Zhao Q, Curran DP, Malacria M, Fensterbank L, Goddard JP, Lacôte E. N-Heterocyclic Carbene-Catalyzed Hydrosilylation of Styryl and Propargylic Alcohols with Dihydrosilanes. Chemistry 2011; 17:9911-4. [PMID: 21796697 DOI: 10.1002/chem.201101822] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2011] [Indexed: 11/08/2022]
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123
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Walton JC, Brahmi MM, Monot J, Fensterbank L, Malacria M, Curran DP, Lacôte E. Electron Paramagnetic Resonance and Computational Studies of Radicals Derived from Boron-Substituted N-Heterocyclic Carbene Boranes. J Am Chem Soc 2011; 133:10312-21. [DOI: 10.1021/ja2038485] [Citation(s) in RCA: 97] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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124
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Lebœuf D, Simonneau A, Aubert C, Malacria M, Gandon V, Fensterbank L. Gold-Catalyzed 1,3-Acyloxy Migration/5-exo-dig Cyclization/1,5-Acyl Migration of Diynyl Esters. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201101179] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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125
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Lebœuf D, Simonneau A, Aubert C, Malacria M, Gandon V, Fensterbank L. Gold-catalyzed 1,3-acyloxy migration/5-exo-dig cyclization/1,5-acyl migration of diynyl esters. Angew Chem Int Ed Engl 2011; 50:6868-71. [PMID: 21671317 DOI: 10.1002/anie.201101179] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2011] [Indexed: 11/10/2022]
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