101
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Roy D, Uozumi Y. Recent Advances in Palladium-Catalyzed Cross-Coupling Reactions at ppm to ppb Molar Catalyst Loadings. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700810] [Citation(s) in RCA: 185] [Impact Index Per Article: 26.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- David Roy
- Institute for Molecular Science; Myodaiji; Okazaki 444-8787 Japan
| | - Yasuhiro Uozumi
- Institute for Molecular Science; Myodaiji; Okazaki 444-8787 Japan
- Green Nanocatalysis Research Team; RIKEN Center for Sustainable Resource Science; Wako 351-0198 Japan
- JST-ACCEL; Myodaiji; Okazaki 444-8787 Japan
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102
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Denmark SE, Ambrosi A. Understanding Site Selectivity in the Palladium-Catalyzed Cross-Coupling of Allenylsilanolates. Synlett 2017; 28:2415-2420. [PMID: 29904234 PMCID: PMC5997285 DOI: 10.1055/s-0036-1588471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Allenylsilanolates can undergo cross-coupling at the α- or γ-terminus, and site selectivity appears to be determined by the intrinsic transmetalation mechanism. Fine-tuning of concentration, nucleophilicity, and steric bulk of the silanolate moiety allows for the selective formation of one isomer over the other. Whereas the α-isomer can be obtained in synthetically useful yield, the γ-isomer is favored only when employing reaction conditions that are inevitably associated with diminished reactivity.
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Affiliation(s)
- Scott E Denmark
- University of Illinois at Urbana-Champaign, Department of Chemistry, 600 S Mathews Ave., Urbana, IL 61801, USA
| | - Andrea Ambrosi
- University of Illinois at Urbana-Champaign, Department of Chemistry, 600 S Mathews Ave., Urbana, IL 61801, USA
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103
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Nareddy P, Jordan F, Szostak M. Recent Developments in Ruthenium-Catalyzed C–H Arylation: Array of Mechanistic Manifolds. ACS Catal 2017. [DOI: 10.1021/acscatal.7b01645] [Citation(s) in RCA: 211] [Impact Index Per Article: 30.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Pradeep Nareddy
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Frank Jordan
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Michal Szostak
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
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104
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Cheng B, Lu P, Zhang H, Cheng X, Lu Z. Highly Enantioselective Cobalt-Catalyzed Hydrosilylation of Alkenes. J Am Chem Soc 2017; 139:9439-9442. [PMID: 28654260 DOI: 10.1021/jacs.7b04137] [Citation(s) in RCA: 134] [Impact Index Per Article: 19.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A cobalt-catalyzed highly Markovnikov-type and enantioselective hydrosilylation of alkenes is developed for the efficient synthesis of valuable chiral dihydrosilanes. This protocol is operationally simple and atom-economy, and using relatively simple and readily available starting materials. The reaction is suitable for both aryl and aliphatic alkenes with excellent functional group tolerability. The reaction could be easily carried out in a gram-scale. The TOF and TON is up to 1800 and 860, respectively.
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Affiliation(s)
- Biao Cheng
- Department of Chemistry, Zhejiang University , Hangzhou 310058, China
| | - Peng Lu
- Department of Chemistry, Zhejiang University , Hangzhou 310058, China
| | - Heyi Zhang
- Department of Chemistry, Zhejiang University , Hangzhou 310058, China
| | - Xinpeng Cheng
- Department of Chemistry, Zhejiang University , Hangzhou 310058, China
| | - Zhan Lu
- Department of Chemistry, Zhejiang University , Hangzhou 310058, China
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105
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Lin Y, Jiang KZ, Cao J, Zheng ZJ, Xu Z, Cui YM, Xu LW. Iridium-Catalyzed Intramolecular C-H Silylation of Siloxane-Tethered Arene and Hydrosilane: Facile and Catalytic Synthesis of Cyclic Siloxanes. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700160] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Yan Lin
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education; Hangzhou Normal University; Hangzhou 311121 People's Republic of China
| | - Ke-Zhi Jiang
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education; Hangzhou Normal University; Hangzhou 311121 People's Republic of China
| | - Jian Cao
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education; Hangzhou Normal University; Hangzhou 311121 People's Republic of China
| | - Zhan-Jiang Zheng
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education; Hangzhou Normal University; Hangzhou 311121 People's Republic of China
| | - Zheng Xu
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education; Hangzhou Normal University; Hangzhou 311121 People's Republic of China
| | - Yu-Ming Cui
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education; Hangzhou Normal University; Hangzhou 311121 People's Republic of China
| | - Li-Wen Xu
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education; Hangzhou Normal University; Hangzhou 311121 People's Republic of China
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106
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Nareddy P, Jordan F, Szostak M. Highly chemoselective ruthenium(ii)-catalyzed direct arylation of cyclic and N, N-dialkyl benzamides with aryl silanes. Chem Sci 2017; 8:3204-3210. [PMID: 28507696 PMCID: PMC5414548 DOI: 10.1039/c7sc00156h] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Accepted: 02/16/2017] [Indexed: 11/21/2022] Open
Abstract
The ruthenium(ii)-catalyzed oxidative cross-coupling of C(sp2)-H bonds with organosilanes has been accomplished for the first time. This novel protocol enlists challenging cyclic and N,N-dialkyl benzamides as weakly-coordinating substrates to achieve highly regioselective C(sp2)-H arylation as a proof-of-concept, taking advantage of the attractive features of organosilanes as coupling partners. This innovative method is characterized by very high chemoselectivity, installing halide functional groups (I, Br, Cl) that are incompatible with Ru(ii)-carboxylate systems employing halides as cross-coupling partners, while obviating the need for sensitive organometallic reagents and cryogenic temperatures typical to the classic directed-ortho-metallation (DoM) techniques, employing benzamides to afford bioactive structural motifs.
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Affiliation(s)
- Pradeep Nareddy
- Department of Chemistry , Rutgers University , 73 Warren Street , Newark , NJ 07102 , USA .
| | - Frank Jordan
- Department of Chemistry , Rutgers University , 73 Warren Street , Newark , NJ 07102 , USA .
| | - Michal Szostak
- Department of Chemistry , Rutgers University , 73 Warren Street , Newark , NJ 07102 , USA .
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107
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Gribble MW, Pirnot MT, Bandar JS, Liu RY, Buchwald SL. Asymmetric Copper Hydride-Catalyzed Markovnikov Hydrosilylation of Vinylarenes and Vinyl Heterocycles. J Am Chem Soc 2017; 139:2192-2195. [PMID: 28117996 PMCID: PMC5386394 DOI: 10.1021/jacs.6b13029] [Citation(s) in RCA: 104] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
![]()
We
report a highly enantioselective CuH-catalyzed Markovnikov hydrosilylation
of vinylarenes and vinyl heterocycles. This method has a broad scope
and enables both the synthesis of isolable silanes and the conversion
of crude products to chiral alcohols. Density functional theory calculations
support a mechanism proceeding by hydrocupration followed by σ-bond
metathesis with a hydrosilane.
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Affiliation(s)
- Michael W Gribble
- Department of Chemistry, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
| | - Michael T Pirnot
- Department of Chemistry, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
| | - Jeffrey S Bandar
- Department of Chemistry, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
| | - Richard Y Liu
- Department of Chemistry, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
| | - Stephen L Buchwald
- Department of Chemistry, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
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108
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Du X, Hou W, Zhang Y, Huang Z. Pincer cobalt complex-catalyzed Z-selective hydrosilylation of terminal alkynes. Org Chem Front 2017. [DOI: 10.1039/c7qo00250e] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Co-Catalyzed Z-selective hydrosilylation of terminal alkynes produces (Z)-β-vinylsilanes, which are further converted to (Z)-disubstituted alkenes by Pd-catalyzed cross couplings.
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Affiliation(s)
- Xiaoyong Du
- State Key Laboratory of Organometallic Chemistry
- Shanghai Institute of Organic Chemistry
- Shanghai
- China
| | - Wenjun Hou
- State Key Laboratory of Organometallic Chemistry
- Shanghai Institute of Organic Chemistry
- Shanghai
- China
| | - Yanlu Zhang
- State Key Laboratory of Organometallic Chemistry
- Shanghai Institute of Organic Chemistry
- Shanghai
- China
| | - Zheng Huang
- State Key Laboratory of Organometallic Chemistry
- Shanghai Institute of Organic Chemistry
- Shanghai
- China
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109
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Nareddy P, Jordan F, Szostak M. Ruthenium(ii)-catalyzed ortho-C–H arylation of diverse N-heterocycles with aryl silanes by exploiting solvent-controlled N-coordination. Org Biomol Chem 2017; 15:4783-4788. [DOI: 10.1039/c7ob00818j] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the first method for the direct, regioselective Ru(ii)-catalyzed oxidative arylation of C–H bonds in diverse N-heterocycles with aryl silanes by exploiting solvent-controlled N-coordination.
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Affiliation(s)
| | - Frank Jordan
- Department of Chemistry
- Rutgers University
- Newark
- USA
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110
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Komiyama T, Minami Y, Hiyama T. Recent Advances in Transition-Metal-Catalyzed Synthetic Transformations of Organosilicon Reagents. ACS Catal 2016. [DOI: 10.1021/acscatal.6b02374] [Citation(s) in RCA: 229] [Impact Index Per Article: 28.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Takeshi Komiyama
- Department
of Applied Chemistry, Chuo University, Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan
| | - Yasunori Minami
- Research
and Development Initiative, Chuo University, Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan
| | - Tamejiro Hiyama
- Research
and Development Initiative, Chuo University, Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan
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111
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Lian Z, Nielsen DU, Lindhardt AT, Daasbjerg K, Skrydstrup T. Cooperative redox activation for carbon dioxide conversion. Nat Commun 2016; 7:13782. [PMID: 27981967 PMCID: PMC5171923 DOI: 10.1038/ncomms13782] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Accepted: 11/01/2016] [Indexed: 11/14/2022] Open
Abstract
A longstanding challenge in production chemistry is the development of catalytic methods for the transformation of carbon dioxide into useful chemicals. Silane and borane promoted reductions can be fined-tuned to provide a number of C1-building blocks under mild conditions, but these approaches are limited because of the production of stoichiometric waste compounds. Here we report on the conversion of CO2 with diaryldisilanes, which through cooperative redox activation generate carbon monoxide and a diaryldisiloxane that actively participate in a palladium-catalysed carbonylative Hiyama-Denmark coupling for the synthesis of an array of pharmaceutically relevant diarylketones. Thus the disilane reagent not only serves as the oxygen abstracting agent from CO2, but the silicon-containing ‘waste', produced through oxygen insertion into the Si–Si bond, participates as a reagent for the transmetalation step in the carbonylative coupling. Hence this concept of cooperative redox activation opens up for new avenues in the conversion of CO2.
While CO2 can be converted to CO for further reactivity, typically this involves the generation of large amounts of waste. Here the authors report the conversion of CO2 to CO, with the siloxane by-product being further used in a carbonylative Hiyama-Denmark coupling to form diarylketones.
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Affiliation(s)
- Zhong Lian
- Carbon Dioxide Activation Center (CADIAC), Interdisciplinary Nanoscience Center, Department of Chemistry, Aarhus University, Gustav Wieds Vej 14, 8000 Aarhus C, Denmark
| | - Dennis U Nielsen
- Carbon Dioxide Activation Center (CADIAC), Interdisciplinary Nanoscience Center, Department of Chemistry, Aarhus University, Gustav Wieds Vej 14, 8000 Aarhus C, Denmark
| | - Anders T Lindhardt
- Carbon Dioxide Activation Center (CADIAC), Interdisciplinary Nanoscience Center, Department of Engineering, Aarhus University, Finlandsgade 22, 8200 Aarhus N, Denmark
| | - Kim Daasbjerg
- Carbon Dioxide Activation Center (CADIAC), Interdisciplinary Nanoscience Center, Department of Chemistry, Aarhus University, Gustav Wieds Vej 14, 8000 Aarhus C, Denmark
| | - Troels Skrydstrup
- Carbon Dioxide Activation Center (CADIAC), Interdisciplinary Nanoscience Center, Department of Chemistry, Aarhus University, Gustav Wieds Vej 14, 8000 Aarhus C, Denmark
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112
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Melvin PR, Hazari N, Beromi MM, Shah HP, Williams MJ. Pd-Catalyzed Suzuki-Miyaura and Hiyama-Denmark Couplings of Aryl Sulfamates. Org Lett 2016; 18:5784-5787. [PMID: 27808517 PMCID: PMC5321212 DOI: 10.1021/acs.orglett.6b02330] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Using a recently discovered precatalyst, the first Pd-catalyzed Suzuki-Miyaura reactions using aryl sulfamates that occur at room temperature are reported. In complementary work, it is demonstrated that a related precatalyst can facilitate the coupling of aryl silanolates, which are less toxic and reactive nucleophiles than boronic acids with aryl chlorides. By combining our results using modern electrophiles and nucleophiles, the first Hiyama-Denmark reactions using aryl sulfamates are reported.
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Affiliation(s)
- Patrick R. Melvin
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Nilay Hazari
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Megan Mohadjer Beromi
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Hemali P. Shah
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Michael J. Williams
- Department of Process Chemistry, Merck Research Laboratories, Rahway, New Jersey 07065, United States
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113
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Bruña S, Garrido-Castro AF, Perles J, Montero-Campillo MM, Mó O, Kaifer AE, Cuadrado I. Multi-Ferrocene-Containing Silanols as Redox-Active Anion Receptors. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00559] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
| | | | | | | | | | - Angel E. Kaifer
- Center
for Supramolecular Science and Department of Chemistry, University of Miami, Coral Gables, Florida 33124-0431, United States
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114
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Jang J, Raja GCE, Lee JH, Son Y, Kim J, Lee S. Palladium-catalyzed decarboxylative coupling reaction with alkynyl carboxylic acids and arylsiloxanes. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.08.095] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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115
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Morstein J, Kalkman ED, Bold C, Cheng C, Hartwig JF. Copper-Mediated C-N Coupling of Arylsilanes with Nitrogen Nucleophiles. Org Lett 2016; 18:5244-5247. [PMID: 27689746 DOI: 10.1021/acs.orglett.6b02543] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A method for the oxidative coupling of arylsilanes with nitrogen nucleophiles is reported. This method occurs with a broad range of heptamethyltrisiloxylarenes and nitrogen nucleophiles, proceeds with the arylsilane as limiting reagent, and does not require a fluoride activator with electron-poor arylsilanes. The combination of this method with C-H silylation generates arylamines from unactivated arenes with site selectivity controlled by steric effects. This combination of steps gives direct access to many compounds that cannot be accessed via alternative C-H functionalization methods, including direct C-H amination or the combination of C-H borylation and amination.
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Affiliation(s)
- Johannes Morstein
- Department of Chemistry, University of California , Berkeley, California 94720, United States
| | - Eric D Kalkman
- Department of Chemistry, University of California , Berkeley, California 94720, United States
| | | | - Chen Cheng
- Department of Chemistry, University of California , Berkeley, California 94720, United States
| | - John F Hartwig
- Department of Chemistry, University of California , Berkeley, California 94720, United States
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116
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Thornbury RT, Toste FD. Palladium-Catalyzed Defluorinative Coupling of 1-Aryl-2,2-Difluoroalkenes and Boronic Acids: Stereoselective Synthesis of Monofluorostilbenes. Angew Chem Int Ed Engl 2016; 55:11629-32. [PMID: 27511868 PMCID: PMC5176253 DOI: 10.1002/anie.201605651] [Citation(s) in RCA: 142] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2016] [Indexed: 11/10/2022]
Abstract
The palladium-catalyzed defluorinative coupling of 1-aryl-2,2-difluoroalkenes with boronic acids is described. Broad functional-group tolerance arises from a redox-neutral process by a palladium(II) active species which is proposed to undergo a β-fluoride elimination to afford the products. The monofluorostilbene products were formed with excellent diastereoselectivity (≥50:1) in all cases, and it is critical, as traditional chromatographic techniques often fail to separate monofluoroalkene isomers. As a demonstration of this method's unique combination of reactivity and functional-group tolerance, a Gleevec® analogue, using a monofluorostilbene as an amide isostere, was synthesized.
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Affiliation(s)
- Richard T Thornbury
- Department of Chemistry, University of California, Berkeley, Berkeley, CA, 94720, USA
| | - F Dean Toste
- Department of Chemistry, University of California, Berkeley, Berkeley, CA, 94720, USA.
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117
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Thornbury RT, Toste FD. Palladium-Catalyzed Defluorinative Coupling of 1-Aryl-2,2-Difluoroalkenes and Boronic Acids: Stereoselective Synthesis of Monofluorostilbenes. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201605651] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Richard T. Thornbury
- Department of Chemistry; University of California, Berkeley; Berkeley CA 94720 USA
| | - F. Dean Toste
- Department of Chemistry; University of California, Berkeley; Berkeley CA 94720 USA
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118
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Morstein J, Hou H, Cheng C, Hartwig JF. Trifluoromethylation of Arylsilanes with [(phen)CuCF3 ]. Angew Chem Int Ed Engl 2016; 55:8054-7. [PMID: 27214849 PMCID: PMC4976628 DOI: 10.1002/anie.201601163] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Revised: 04/10/2016] [Indexed: 11/05/2022]
Abstract
A method for the trifluoromethylation of arylsilanes is reported. The reaction proceeds with [(phen)CuCF3 ] as the CF3 source under mild, oxidative conditions with high functional-group compatibility. This transformation complements prior trifluoromethylation of arenes in several ways. Most important, this method converts arylsilanes formed by the silylation of aryl C-H bonds to trifluoromethylarenes, thereby allowing the conversion of arenes to trifluoromethylarenes. The unique capabilities of the reported method are demonstrated by the conversion of a C-H bond into a C-CF3 bond in active pharmaceutical ingredients which do not undergo this overall transformation by alternative functionalization processes, including a combination of borylation and trifluoromethylation.
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Affiliation(s)
- Johannes Morstein
- Department of Chemistry, University of California, Berkeley, Berkeley, CA, 94720, USA
| | - Haiyun Hou
- Department of Chemistry, University of California, Berkeley, Berkeley, CA, 94720, USA
| | - Chen Cheng
- Department of Chemistry, University of California, Berkeley, Berkeley, CA, 94720, USA
| | - John F Hartwig
- Department of Chemistry, University of California, Berkeley, Berkeley, CA, 94720, USA.
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119
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Morstein J, Hou H, Cheng C, Hartwig JF. Trifluoromethylation of Arylsilanes with [(phen)CuCF3
]. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201601163] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Johannes Morstein
- Department of Chemistry; University of California, Berkeley; Berkeley CA 94720 USA
| | - Haiyun Hou
- Department of Chemistry; University of California, Berkeley; Berkeley CA 94720 USA
| | - Chen Cheng
- Department of Chemistry; University of California, Berkeley; Berkeley CA 94720 USA
| | - John F. Hartwig
- Department of Chemistry; University of California, Berkeley; Berkeley CA 94720 USA
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120
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delPozo J, Casares JA, Espinet P. In Situ Generation of ArCu from CuF2 Makes Coupling of Bulky Aryl Silanes Feasible and Highly Efficient. Chemistry 2016; 22:4274-84. [PMID: 26895353 DOI: 10.1002/chem.201504435] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Indexed: 11/11/2022]
Abstract
A bimetallic system of Pd/CuF2, catalytic in Pd and stoichiometric in Cu, is very efficient and selective for the coupling of fairly hindered aryl silanes with aryl, anisyl, phenylaldehyde, p-cyanophenyl, p-nitrophenyl, or pyridyl iodides of conventional size. The reaction involves the activation of the silane by Cu(II), followed by disproportionation and transmetalation from the Cu(I)(aryl) to Pd(II), upon which coupling takes place. Cu(III) formed during disproportionation is reduced to Cu(I)(aryl) by excess aryl silane, so that the CuF2 system is fully converted into Cu(I)(aryl) and used in the coupling. Moreover, no extra source of fluoride is needed. Interesting size selectivity towards coupling is found in competitive reactions of hindered aryl silanes. Easily accessible [PdCl2 (IDM)(AsPh3)] (IDM = 1,3-dimethylimidazol-2-ylidene) is by far the best catalyst, and the isolated products are essentially free from As or Pd (<1 ppm). The mechanistic aspects of the process have been experimentally examined and discussed.
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Affiliation(s)
- Juan delPozo
- IU CINQUIMA/Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, 47011, Valladolid, Spain
| | - Juan A Casares
- IU CINQUIMA/Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, 47011, Valladolid, Spain.
| | - Pablo Espinet
- IU CINQUIMA/Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, 47011, Valladolid, Spain.
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121
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Frihed TG, Fürstner A. Progress in the trans-Reduction and trans-Hydrometalation of Internal Alkynes. Applications to Natural Product Synthesis. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2016. [DOI: 10.1246/bcsj.20150317] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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122
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Pan S, Wu F, Yu R, Chen W. Palladium-Catalyzed Sequential Acylation/Cyanation of Aryl Iodides: A Regiospecific Synthesis of 2-Cyanoaryl Ketones. J Org Chem 2016; 81:1558-64. [DOI: 10.1021/acs.joc.5b02710] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Shanfei Pan
- Department
of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Feifei Wu
- Department
of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Ruicheng Yu
- Department
of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Wanzhi Chen
- Department
of Chemistry, Zhejiang University, Hangzhou 310027, China
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123
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Liu Y, Wang X, Cai X, Chen G, Li J, Zhou Y, Wang J. Highly Active Palladium-Based Catalyst System for the Aerobic Oxidative Direct Coupling of Benzene to Biphenyl. ChemCatChem 2015. [DOI: 10.1002/cctc.201500951] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Yangqing Liu
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering; Nanjing Tech University; Nanjing Jiangsu 210009 P.R. China
| | - Xiaochen Wang
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering; Nanjing Tech University; Nanjing Jiangsu 210009 P.R. China
| | - Xiaochun Cai
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering; Nanjing Tech University; Nanjing Jiangsu 210009 P.R. China
| | - Guojian Chen
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering; Nanjing Tech University; Nanjing Jiangsu 210009 P.R. China
| | - Jing Li
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering; Nanjing Tech University; Nanjing Jiangsu 210009 P.R. China
| | - Yu Zhou
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering; Nanjing Tech University; Nanjing Jiangsu 210009 P.R. China
| | - Jun Wang
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering; Nanjing Tech University; Nanjing Jiangsu 210009 P.R. China
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