101
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Zhou P, Hu B, Wang Y, Zhang Q, Li X, Yan S, Yu F. Convenient Synthesis of Quinoline-4-carboxylate Derivatives through the Bi(OTf)3
-Catalyzed Domino Cyclization/Esterification Reaction of Isatins with Enaminones in Alcohols. European J Org Chem 2018. [DOI: 10.1002/ejoc.201800734] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Pan Zhou
- Faculty of Life Science and Technology; Kunming University of Science and Technology; 650504 Kunming P. R. China
| | - Biao Hu
- Faculty of Life Science and Technology; Kunming University of Science and Technology; 650504 Kunming P. R. China
| | - Yanqin Wang
- Faculty of Life Science and Technology; Kunming University of Science and Technology; 650504 Kunming P. R. China
| | - Qiaohe Zhang
- Faculty of Life Science and Technology; Kunming University of Science and Technology; 650504 Kunming P. R. China
| | - Xiang Li
- Research Center for Analysis and Measurement; Kunming University of Science and Technology; 650500 Kunming P. R. China
| | - Shengjiao Yan
- School of Chemical Science and Technology; Yunnan University; 650500 Kunming P. R. China
| | - Fuchao Yu
- Faculty of Life Science and Technology; Kunming University of Science and Technology; 650504 Kunming P. R. China
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102
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Wang C, Ge S. Versatile Cobalt-Catalyzed Enantioselective Entry to Boryl-Functionalized All-Carbon Quaternary Stereogenic Centers. J Am Chem Soc 2018; 140:10687-10690. [DOI: 10.1021/jacs.8b06814] [Citation(s) in RCA: 58] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Chao Wang
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Shaozhong Ge
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
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103
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Kim-Lee SH, Alonso I, Mauleón P, Arrayás RG, Carretero JC. Rationalizing the Role of NaOtBu in Copper-Catalyzed Carboboration of Alkynes: Assembly of Allylic All-Carbon Quaternary Stereocenters. ACS Catal 2018. [DOI: 10.1021/acscatal.8b02123] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Shin-Ho Kim-Lee
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid (UAM), Cantoblanco, 28049 Madrid, Spain
| | - Inés Alonso
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid (UAM), Cantoblanco, 28049 Madrid, Spain
- Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid (UAM), 28049 Madrid, Spain
| | - Pablo Mauleón
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid (UAM), Cantoblanco, 28049 Madrid, Spain
- Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid (UAM), 28049 Madrid, Spain
| | - Ramón Gómez Arrayás
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid (UAM), Cantoblanco, 28049 Madrid, Spain
- Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid (UAM), 28049 Madrid, Spain
| | - Juan C. Carretero
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid (UAM), Cantoblanco, 28049 Madrid, Spain
- Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid (UAM), 28049 Madrid, Spain
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104
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Wei D, Carboni B, Sortais JB, Darcel C. Iron-Catalyzed Dehydrogenative Borylation of Terminal Alkynes. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201800588] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Duo Wei
- Univ Rennes, CNRS; ISCR (Institut des Sciences Chimiques de Rennes), UMR 6226, F-; 35042 Rennes France
| | - Bertrand Carboni
- Univ Rennes, CNRS; ISCR (Institut des Sciences Chimiques de Rennes), UMR 6226, F-; 35042 Rennes France
| | - Jean-Baptiste Sortais
- Univ Rennes, CNRS; ISCR (Institut des Sciences Chimiques de Rennes), UMR 6226, F-; 35042 Rennes France
- LCC-CNRS; Université de Toulouse, CNRS, UPS; Toulouse France
- Institut Universitaire de France; 1 rue Descartes 75231 Paris Cedex 05 France
| | - Christophe Darcel
- Univ Rennes, CNRS; ISCR (Institut des Sciences Chimiques de Rennes), UMR 6226, F-; 35042 Rennes France
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105
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Nichols BR, Akhmedov NG, Petersen JL, Popp BV. Access to a pair of ambiphilic phosphine-borane regioisomers by rhodium-catalyzed hydroboration. Dalton Trans 2018; 47:8456-8465. [PMID: 29901042 DOI: 10.1039/c8dt01467a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Lewis basic substrates, such as vinylphosphines and enamines, can be problematic for transition-metal catalysed hydrofunctionalization reactions due to their propensity to ligate and deactivate transition-metal catalysts as well as form direct Lewis adducts with reaction partners. While exploring rhodium-catalyzed hydroboration of diphenylvinylphosphine with pinacolborane, we found that a high degree of regiocontrol could be achieved without the need to diminish the Lewis basicity of the phosphine by oxidation or prior-protection. At slightly elevated temperature, a high yield of the previously unreported branched regioisomer, 1-pinacolatoborono-1-diphenylphosphinoethane, was achieved with regioselectivity greater than 10 : 1 using [Rh(COD)Cl]2 as the catalyst and AgOTf as a catalytic additive. Inversion of regioselectivity occurred at low temperature and high yield of the linear regioisomer was observed. Subsequent functionalization of the new branched phosphine-boronic ester and its coordination to rhodium were also investigated.
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Affiliation(s)
- Brian R Nichols
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26505, USA.
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106
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Buñuel E, Cárdenas DJ. Towards Useful Boronates through Atom-Economical Catalyzed Cascade Reactions. Chemistry 2018; 24:11239-11244. [DOI: 10.1002/chem.201800659] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Indexed: 01/14/2023]
Affiliation(s)
- Elena Buñuel
- Departamento de Química Orgánica, Facultad de Ciencias; Universidad Autónoma de Madrid, Institute for Advanced Research in Chemical Sciences (IAdChem); Av. Francisco Tomás y Valiente 7 Cantoblanco 28049 Madrid Spain
| | - Diego J. Cárdenas
- Departamento de Química Orgánica, Facultad de Ciencias; Universidad Autónoma de Madrid, Institute for Advanced Research in Chemical Sciences (IAdChem); Av. Francisco Tomás y Valiente 7 Cantoblanco 28049 Madrid Spain
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107
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Iwai K, Yokoyama S, Asahara H, Nishiwaki N. Phosphine Induced Dimerization of Propargyl Alcohols Leading to Allyl Propargyl Ethers. J Oleo Sci 2018; 67:773-778. [PMID: 29760335 DOI: 10.5650/jos.ess17277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
A facile method for synthesizing allyl propargyl ethers (APEs) was developed based on the dimerization of propargyl alcohols. The reaction proceeded via an oxaphosphetane intermediate, which was generated without the use of a strong base, thus making this process a pseudo-Wittig reaction under mild reaction conditions. A wide variety of functional groups, including formyl and pyridyl groups were tolerated, thus yielding the corresponding functionalized APEs, which are otherwise not readily prepared via conventional methods. Moreover, a cross-reaction was found to occur when the reaction was conducted in the presence of alcohols that were more acidic than propargyl alcohol, which suggests that the proton transfer from the intermediately formed betaine to the second alcohol is crucial for undergoing the dimerization.
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Affiliation(s)
- Kento Iwai
- School of Environmental Science and Engineering, Kochi University of Technology
| | - Soichi Yokoyama
- School of Environmental Science and Engineering, Kochi University of Technology.,Research Center for Material Science and Engineering, Kochi University of Technology
| | - Haruyasu Asahara
- School of Environmental Science and Engineering, Kochi University of Technology.,Research Center for Material Science and Engineering, Kochi University of Technology.,Department of Applied Chemistry, Grasuate School of Engineering, Osaka University
| | - Nagatoshi Nishiwaki
- School of Environmental Science and Engineering, Kochi University of Technology.,Research Center for Material Science and Engineering, Kochi University of Technology
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108
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Wu C, Teo WJ, Ge S. Cobalt-Catalyzed (E)-Selective anti-Markovnikov Hydrosilylation of Terminal Alkynes. ACS Catal 2018. [DOI: 10.1021/acscatal.8b01410] [Citation(s) in RCA: 68] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Caizhi Wu
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Wei Jie Teo
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Shaozhong Ge
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
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109
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Obligacion JV, Chirik PJ. Earth-Abundant Transition Metal Catalysts for Alkene Hydrosilylation and Hydroboration: Opportunities and Assessments. Nat Rev Chem 2018; 2:15-34. [PMID: 30740530 PMCID: PMC6365001 DOI: 10.1038/s41570-018-0001-2] [Citation(s) in RCA: 486] [Impact Index Per Article: 81.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The addition of a silicon-hydrogen or a boron-hydrogen bond across a carbon-carbon multiple bonds is a well-established method for the introduction of versatile silane and borane functional groups to base hydrocarbon feedstocks. Transition metal catalysis, historically with precious second- and third- row transition metals, has been used to broaden the scope of the hydrofunctionalization reaction, improve reaction rate and enhance selectivity. The anti-Markovnikov selectivity of platinum-catalyzed hydrosilylation of alkenes, for example, is an enabling synthetic technology in the multibillion-dollar silicones industry. Increased emphasis on sustainable catalytic methods and more economic processes has shifted focus to catalysis with more earth-abundant transition metals such as iron, cobalt and nickel. This review describes contemporary approaches and offers a contextual analysis of catalytic alkene hydrosilylation and hydroboration reactions using first-row transition metals. Emphasis is placed on defining advances in the field, what constitutes catalyst cost, safety, and important design features to enable precious metal-like reactivity, as well as new chemistry that is unique to first-row transition metals.
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Affiliation(s)
- Jennifer V Obligacion
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Paul J Chirik
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
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110
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Qi J, Zhang FL, Huang YS, Xu AQ, Ren SC, Yi ZY, Wang YF. Radical Borylative Cyclization of 1,6-Dienes: Synthesis of Boron-Substituted Six-Membered Heterocycles and Carbocycles. Org Lett 2018; 20:2360-2364. [PMID: 29624068 DOI: 10.1021/acs.orglett.8b00694] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A radical borylative cyclization reaction of 1,6-dienes was developed to assemble boron-handled six-membered heterocycles and carbocycles. This reaction was initiated by the chemo- and regio-controlled addition of an N-heterocyclic carbene-boryl radical to one of the alkene tethers, followed by an intramolecular 6- exo cyclization to afford a six-membered ring framework. The utility of this method was demonstrated in the synthesis of diverse paroxetine analogues through late-stage derivatization of the boryl functional unit.
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Affiliation(s)
- Jing Qi
- Hefei National Laboratory for Physical Sciences at the Microscale, Center for Excellence in Molecular Synthesis of CAS, and Department of Chemistry , University of Science and Technology of China , 96 Jinzhai Road , Hefei , Anhui 230026 , People's Republic of China
| | - Feng-Lian Zhang
- Hefei National Laboratory for Physical Sciences at the Microscale, Center for Excellence in Molecular Synthesis of CAS, and Department of Chemistry , University of Science and Technology of China , 96 Jinzhai Road , Hefei , Anhui 230026 , People's Republic of China
| | - Yun-Shuai Huang
- Hefei National Laboratory for Physical Sciences at the Microscale, Center for Excellence in Molecular Synthesis of CAS, and Department of Chemistry , University of Science and Technology of China , 96 Jinzhai Road , Hefei , Anhui 230026 , People's Republic of China
| | - Ai-Qing Xu
- Hefei National Laboratory for Physical Sciences at the Microscale, Center for Excellence in Molecular Synthesis of CAS, and Department of Chemistry , University of Science and Technology of China , 96 Jinzhai Road , Hefei , Anhui 230026 , People's Republic of China
| | - Shi-Chao Ren
- Hefei National Laboratory for Physical Sciences at the Microscale, Center for Excellence in Molecular Synthesis of CAS, and Department of Chemistry , University of Science and Technology of China , 96 Jinzhai Road , Hefei , Anhui 230026 , People's Republic of China
| | - Zhen-Yu Yi
- Hefei National Laboratory for Physical Sciences at the Microscale, Center for Excellence in Molecular Synthesis of CAS, and Department of Chemistry , University of Science and Technology of China , 96 Jinzhai Road , Hefei , Anhui 230026 , People's Republic of China
| | - Yi-Feng Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, Center for Excellence in Molecular Synthesis of CAS, and Department of Chemistry , University of Science and Technology of China , 96 Jinzhai Road , Hefei , Anhui 230026 , People's Republic of China.,State Key Laboratory of Elemento-Organic Chemistry , Nankai University , Tianjin 300071 , People's Republic of China
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111
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112
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Cabrera-Lobera N, Rodríguez-Salamanca P, Nieto-Carmona JC, Buñuel E, Cárdenas DJ. Iron-Catalyzed Hydroborylative Cyclization of 1,6-Enynes. Chemistry 2018; 24:784-788. [PMID: 29105882 DOI: 10.1002/chem.201704401] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Indexed: 12/14/2022]
Abstract
We report first Fe-catalyzed hydroborylative cyclization reaction. The process provides one C-C and one C-B bond in a single operation and shows a wide scope, allowing the formation of carbo- and heterocycles containing a homoallylic boryl unit that can be further functionalized. The reaction takes place in smooth conditions, with inexpensive catalytic system and full atom economy since HBpin is the borylation agent, in contrast to our previously reported Pd-catalyzed reaction. Both aryl and alkyl substituted alkynes are reactive, revealing a wide reaction scope. Mechanistic studies suggest the intermediacy of FeII -hydride active catalyst capable to react with the alkyne group prior to alkene insertion, and computational studies suggest the occurrence of barrierless σ-bond metathesis involving HBpin and Fe-C bonds along the catalytic cycle.
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Affiliation(s)
- Natalia Cabrera-Lobera
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, Institute for Advanced Research in, Chemical Sciences (IAdChem), Av. Francisco Tomás y Valiente 7, Cantoblanco, 28049-Madrid, Spain
| | - Patricia Rodríguez-Salamanca
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, Institute for Advanced Research in, Chemical Sciences (IAdChem), Av. Francisco Tomás y Valiente 7, Cantoblanco, 28049-Madrid, Spain
| | - Juan C Nieto-Carmona
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, Institute for Advanced Research in, Chemical Sciences (IAdChem), Av. Francisco Tomás y Valiente 7, Cantoblanco, 28049-Madrid, Spain
| | - Elena Buñuel
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, Institute for Advanced Research in, Chemical Sciences (IAdChem), Av. Francisco Tomás y Valiente 7, Cantoblanco, 28049-Madrid, Spain
| | - Diego J Cárdenas
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, Institute for Advanced Research in, Chemical Sciences (IAdChem), Av. Francisco Tomás y Valiente 7, Cantoblanco, 28049-Madrid, Spain
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113
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Cobalt-Catalyzed Diborylation of 1,1-disubstituted Vinylarenes: A Practical Route to Branched gem
-Bis(boryl)alkanes. Angew Chem Int Ed Engl 2018; 57:1654-1658. [DOI: 10.1002/anie.201710389] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Revised: 11/09/2017] [Indexed: 01/21/2023]
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114
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Teo WJ, Ge S. Cobalt-Catalyzed Diborylation of 1,1-disubstituted Vinylarenes: A Practical Route to Branched gem
-Bis(boryl)alkanes. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201710389] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Wei Jie Teo
- Department of Chemistry; National University of Singapore; 3 Science Drive 3 Singapore 117543 Singapore
| | - Shaozhong Ge
- Department of Chemistry; National University of Singapore; 3 Science Drive 3 Singapore 117543 Singapore
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115
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Sang HL, Yu S, Ge S. Copper-catalyzed asymmetric hydroboration of 1,3-enynes with pinacolborane to access chiral allenylboronates. Org Chem Front 2018. [DOI: 10.1039/c8qo00167g] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A wide range of functionalized 1,3-enynes undergo hydroboration with pinacolborane to produce enantiomerically enriched allenylboronates in the presence of a chiral copper catalyst.
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Affiliation(s)
- Hui Leng Sang
- Department of Chemistry
- National University of Singapore
- Singapore 117543
- Singapore
| | - Songjie Yu
- Department of Chemistry
- National University of Singapore
- Singapore 117543
- Singapore
| | - Shaozhong Ge
- Department of Chemistry
- National University of Singapore
- Singapore 117543
- Singapore
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116
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Wang C, Teo WJ, Ge S. Access to stereodefined (Z)-allylsilanes and (Z)-allylic alcohols via cobalt-catalyzed regioselective hydrosilylation of allenes. Nat Commun 2017; 8:2258. [PMID: 29273720 PMCID: PMC5741631 DOI: 10.1038/s41467-017-02382-7] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Accepted: 11/23/2017] [Indexed: 11/23/2022] Open
Abstract
Hydrosilylation of allenes is the addition of a hydrogen atom and a silyl group to a carbon–carbon double bond of an allene molecule and represents a straightforward and atom-economical approach to prepare synthetically versatile allylsilanes and vinylsilanes. However, this reaction generally produces six possible isomeric organosilanes, and the biggest challenge in developing this reaction is to control both regioselectivity and stereoselectivity. The majorities of the developed allene hydrosilylation reactions show high selectivity towards the production of vinylsilanes or branched allylsilanes. By employing a cobalt catalyst generated from readily available and bench-stable cobalt precursor and phosphine-based ligands, here we show that this reaction proceeds under mild conditions in a regioselective and stereoselective manner, and affords synthetically challenging, but valuable linear cis-allylsilanes with excellent stereoselectivity (generally cis to trans ratios: >98:2). This cobalt-catalyzed (Z)-selective allene hydrosilylation provides a general approach to access molecules containing stereodefined (Z)-alkene units. Controlling selectivity in the hydrosilylation of allenes poses serious challenges in terms of product stereochemistry. Here the authors show that the title reaction proceeds with excellent (Z)-selectivity by use of a cobalt catalyst in the presence of phosphine-based ligands.
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Affiliation(s)
- Chao Wang
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
| | - Wei Jie Teo
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
| | - Shaozhong Ge
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore.
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117
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Sang HL, Yu S, Ge S. Cobalt-catalyzed regioselective stereoconvergent Markovnikov 1,2-hydrosilylation of conjugated dienes. Chem Sci 2017; 9:973-978. [PMID: 29629163 PMCID: PMC5873224 DOI: 10.1039/c7sc04002d] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Accepted: 11/26/2017] [Indexed: 11/21/2022] Open
Abstract
The first transition metal-catalyzed stereoconvergent Markovnikov 1,2-hydrosilylation of (E/Z)-dienes was effectively achieved with excellent E-selectivities using a cobalt catalyst.
We report the first stereoconvergent Markovnikov 1,2-hydrosilylation of conjugated dienes using catalysts generated from bench-stable Co(acac)2 and phosphine ligands. A wide range of E/Z-dienes underwent this Markovnikov 1,2-hydrosilylation in a stereoconvergent manner, affording (E)-allylsilanes in high isolated yields with high stereoselectivities (E/Z = >99 : 1) and high regioselectivities (b/l up to > 99 : 1). Mechanistic studies revealed that this stereoconvergence stems from a σ–π–σ isomerization of an allylcobalt species generated by the 1,4-hydrometalation of Z-dienes. In addition, a cobalt catalyst that can only catalyze the hydrosilylation of the E-isomer of an (E/Z)-diene was identified, which allows the separation of the (Z)-isomer from an isomeric mixture of (E/Z)-dienes. Furthermore, asymmetric hydrosilylation of (E)-1-aryl-1,3-dienes was studied with Co(acac)2/(R)-difluorphos and good enantioselectivities (er up to 90 : 10) were obtained.
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Affiliation(s)
- Hui Leng Sang
- Department of Chemistry , National University of Singapore , 3 Science Drive 3 , Singapore 117543 , Singapore .
| | - Songjie Yu
- Department of Chemistry , National University of Singapore , 3 Science Drive 3 , Singapore 117543 , Singapore .
| | - Shaozhong Ge
- Department of Chemistry , National University of Singapore , 3 Science Drive 3 , Singapore 117543 , Singapore .
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118
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Yu S, Sang HL, Ge S. Enantioselective Copper-Catalyzed Alkylation of Quinoline N-Oxides with Vinylarenes. Angew Chem Int Ed Engl 2017; 56:15896-15900. [PMID: 29044900 DOI: 10.1002/anie.201709411] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 10/14/2017] [Indexed: 11/06/2022]
Abstract
An asymmetric copper-catalyzed alkylation of quinoline N-oxides with chiral Cu-alkyl species, generated by migratory insertion of a vinylarene into a chiral Cu-H complex, is reported. A variety of quinoline N-oxides and vinylarenes underwent this Cu-catalyzed enantioselective alkylation reaction, affording the corresponding chiral alkylated N-heteroarenes in high yield with high-to-excellent enantioselectivity. This enantioselective protocol represents the first general and practical approach to access a wide range of chiral alkylated quinolines.
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Affiliation(s)
- Songjie Yu
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
| | - Hui Leng Sang
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
| | - Shaozhong Ge
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
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119
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Yu S, Sang HL, Ge S. Enantioselective Copper-Catalyzed Alkylation of Quinoline N
-Oxides with Vinylarenes. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201709411] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Songjie Yu
- Department of Chemistry; National University of Singapore; 3 Science Drive 3, Singapore 117543 Singapore
| | - Hui Leng Sang
- Department of Chemistry; National University of Singapore; 3 Science Drive 3, Singapore 117543 Singapore
| | - Shaozhong Ge
- Department of Chemistry; National University of Singapore; 3 Science Drive 3, Singapore 117543 Singapore
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120
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Iwamoto H, Ozawa Y, Kubota K, Ito H. Copper(I)-Catalyzed Regio- and Stereoselective Intramolecular Alkylboration of Propargyl Ethers and Amines. J Org Chem 2017; 82:10563-10573. [DOI: 10.1021/acs.joc.7b02071] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hiroaki Iwamoto
- Division of Applied Chemistry,
Graduate School of Engineering, Hokkaido University, Sapporo, Hokkaido 060-8628, Japan
| | - Yu Ozawa
- Division of Applied Chemistry,
Graduate School of Engineering, Hokkaido University, Sapporo, Hokkaido 060-8628, Japan
| | - Koji Kubota
- Division of Applied Chemistry,
Graduate School of Engineering, Hokkaido University, Sapporo, Hokkaido 060-8628, Japan
| | - Hajime Ito
- Division of Applied Chemistry,
Graduate School of Engineering, Hokkaido University, Sapporo, Hokkaido 060-8628, Japan
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121
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Ma M, Li J, Shen X, Yu Z, Yao W, Pullarkat SA. Sterically bulky amido magnesium methyl complexes: syntheses, structures and catalysis. RSC Adv 2017. [DOI: 10.1039/c7ra08836a] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The synthesis, crystal structure and catalysis of a series of sterically bulky amidomagnesium methyl complexes are described.
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Affiliation(s)
- Mengtao Ma
- College of Science
- Nanjing Forestry University
- Nanjing 210037
- People's Republic of China
| | - Jia Li
- College of Science
- Nanjing Forestry University
- Nanjing 210037
- People's Republic of China
| | - Xingchao Shen
- College of Science
- Nanjing Forestry University
- Nanjing 210037
- People's Republic of China
| | - Zhijuan Yu
- College of Science
- Nanjing Forestry University
- Nanjing 210037
- People's Republic of China
| | - Weiwei Yao
- College of Pharmacy
- Nanjing University of Chinese Medicine
- Nanjing 210023
- People's Republic of China
| | - Sumod A. Pullarkat
- Division of Chemistry & Biological Chemistry
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore 637371
- Singapore
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122
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Hsieh JC, Hong YC, Yang CM, Mannathan S, Cheng CH. Nickel-catalyzed highly chemo- and stereoselective borylative cyclization of 1,6-enynes with bis(pinacolato)diboron. Org Chem Front 2017. [DOI: 10.1039/c7qo00321h] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
A highly chemo- and stereoselective nickel-catalyzed borylative cyclization of 1,6-enynes with bis(pinacolato)diboron.
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Affiliation(s)
- Jen-Chieh Hsieh
- Department of Chemistry
- Tamkang University
- New Taipei City
- Republic of China
| | - Ya-Chun Hong
- Department of Chemistry
- National Tsing Hua University
- Hsinchu
- Republic of China
| | - Chun-Ming Yang
- Department of Chemistry
- National Tsing Hua University
- Hsinchu
- Republic of China
| | | | - Chien-Hong Cheng
- Department of Chemistry
- National Tsing Hua University
- Hsinchu
- Republic of China
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