1
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Swann N, Tang K, Nam J, Lee J, Domin M, Shaw TE, Kozimor SA, Som S, Lee KL. Intermolecular C-H silylations of arenes and heteroarenes with mono-, bis-, and tris(trimethylsiloxy)hydrosilanes: control of silane redistribution under operationally diverse approaches. Chem Sci 2024; 15:11912-11918. [PMID: 39092102 PMCID: PMC11290416 DOI: 10.1039/d4sc03394a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2024] [Accepted: 06/17/2024] [Indexed: 08/04/2024] Open
Abstract
Efficient catalytic protocols for C-H silylations of arenes and heteroarenes with sterically and electronically different hydrosiloxysilanes are disclosed. The silylations are catalyzed by a well-defined Rh-complex (1 mol%), derived from [Rh(1,5-hexadiene)Cl]2 and a bulky BINAP type ligand. This catalyst not only promotes C-Si bond formation affording the desired products in up to 95% isolated yield, but also can suppress the silane redistribution side reactions of HSiMe2(OTMS). The protocol can also be applied for the C-H silylations of more reactive HSiMe(OTMS)2 with a much lower catalyst loading (0.25 mol%) and even with sterically demanding HSi(OTMS)3. The steric bulk of the arene substituent and hydrosiloxysilane is a major factor in determining the regioselectivity and electronic effect as secondary. The current method can be performed under operationally diverse conditions: with/without a hydrogen scavenger or solvent.
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Affiliation(s)
- Noah Swann
- University of Central Florida, Department of Chemistry 4111 Libra Drive, PSB #255 Orlando FL USA 32816
| | - Kiki Tang
- University of Central Florida, Department of Chemistry 4111 Libra Drive, PSB #255 Orlando FL USA 32816
| | - Jihyeon Nam
- University of Central Florida, Department of Chemistry 4111 Libra Drive, PSB #255 Orlando FL USA 32816
| | - Jooyeon Lee
- University of Central Florida, Department of Chemistry 4111 Libra Drive, PSB #255 Orlando FL USA 32816
| | - Marek Domin
- Mass Spectrometry Centre, Boston College 245 Beacon Street, Chestnut Hill MA 02467 USA
| | - Thomas E Shaw
- Los Alamos National Laboratory P.O. Box 1663 Los Alamos NM 87545 USA
| | - Stosh A Kozimor
- Los Alamos National Laboratory P.O. Box 1663 Los Alamos NM 87545 USA
| | - Salina Som
- University of Central Florida, Department of Chemistry 4111 Libra Drive, PSB #255 Orlando FL USA 32816
| | - Kangsang L Lee
- University of Central Florida, Department of Chemistry 4111 Libra Drive, PSB #255 Orlando FL USA 32816
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2
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Chen S, Zhu J, Ke J, Li Y, He C. Enantioselective Intermolecular C-H Silylation of Heteroarenes for the Synthesis of Acyclic Si-Stereogenic Silanes. Angew Chem Int Ed Engl 2022; 61:e202117820. [PMID: 35263001 DOI: 10.1002/anie.202117820] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Indexed: 12/21/2022]
Abstract
Intermolecular C-H silylation for the synthesis of acyclic silanes bearing a silicon-stereogenic center in one enantiomeric form remains unknown to date. Herein, we report the first enantioselective intermolecular C-H silylation of heteroarenes for the synthesis of acyclic silicon-stereogenic heteroarylsilanes. This process undergoes a rhodium-catalyzed direct intermolecular dehydrogenative Si-H/C-H cross-coupling, giving access to a variety of acyclic heteroarylated silicon-stereogenic monohydrosilanes, including bis-Si-stereogenic silanes, in decent yields with excellent chemo-, regio-, and stereo-control, which significantly enlarge the chemical space of the optically active silicon-stereogenic monohydrosilanes.
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Affiliation(s)
- Shuyou Chen
- Shenzhen Grubbs Institute and Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Jiefeng Zhu
- Shenzhen Grubbs Institute and Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Jie Ke
- Shenzhen Grubbs Institute and Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Yingzi Li
- Shenzhen Grubbs Institute and Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Chuan He
- Shenzhen Grubbs Institute and Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
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3
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Chen S, Zhu J, Ke J, Li Y, He C. Enantioselective Intermolecular C−H Silylation of Heteroarenes for the Synthesis of Acyclic Si‐Stereogenic Silanes. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202117820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Shuyou Chen
- Shenzhen Grubbs Institute and Department of Chemistry Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and Technology Shenzhen Guangdong 518055 China
| | - Jiefeng Zhu
- Shenzhen Grubbs Institute and Department of Chemistry Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and Technology Shenzhen Guangdong 518055 China
| | - Jie Ke
- Shenzhen Grubbs Institute and Department of Chemistry Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and Technology Shenzhen Guangdong 518055 China
| | - Yingzi Li
- Shenzhen Grubbs Institute and Department of Chemistry Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and Technology Shenzhen Guangdong 518055 China
| | - Chuan He
- Shenzhen Grubbs Institute and Department of Chemistry Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and Technology Shenzhen Guangdong 518055 China
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4
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Som S, Choi J, Katsoulis D, Lee KL. A direct method to access various functional arylalkoxysilanes by Rh-catalysed intermolecular C–H silylation of alkoxysilanes. Chem Sci 2022; 13:10759-10764. [PMID: 36320708 PMCID: PMC9491085 DOI: 10.1039/d2sc03727k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Accepted: 08/19/2022] [Indexed: 11/29/2022] Open
Abstract
Efficient protocols for intermolecular C–H silylations of unactivated arenes and heteroarenes with HMe2SiOEt are disclosed. The silylations are catalysed by a Rh-complex (0.5 mol%) derived from commercially available [Rh(coe)2Cl]2 and (S,S)-Ph-BPE in the presence of cyclohexene at 100 °C, furnishing desired arylethoxydimethylsilanes up to 99% yield. The regioselectivity is mainly affected by the steric bulk of the substituents in arenes and by electronic effects as an ancillary factor. Mechanistic study revealed that the mono-hydrido dimeric Rh-complex, [Rh2(Ph-BPE)2(μ-H)(μ-Cl)], is an active catalytic intermediate, which further suppresses the formation of redistribution byproducts in the silylation. Preliminary results show that the current protocol can be extended to double C–H silylations affording bis-silylated arenes and is applicable to the silylation of HMeSi(OEt)2 to deliver the corresponding (aryl)SiMe(OEt)2. The control of alkoxysilane redistribution enables the direct access of functional arylalkoxysilanes by Rh-catalyzed C–H silylations.![]()
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Affiliation(s)
- Salina Som
- University of Central Florida, Department of Chemistry, 4111 Libra Drive, PSB #255, Orlando, FL, USA 32816
| | - Jongwook Choi
- Dow Chemical Company, 2200 West Salzburg Road, Auburn, MI, USA 48611
| | | | - Kangsang L. Lee
- University of Central Florida, Department of Chemistry, 4111 Libra Drive, PSB #255, Orlando, FL, USA 32816
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5
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Murai M. Silylative Cyclization with Dehydrogenation Leading to Benzosilole‐Fused Azulenes Showing Unique Stimuli‐Responsive Fluorescence. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100651] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Masahito Murai
- Department of Chemistry Graduate School of Science Nagoya University Furo, Chikusa 464-8602 Nagoya Japan
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6
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Miura H, Hirata R, Tomoya T, Shishido T. Electrophilic C(sp
2
)−H Silylation by Supported Gold Catalysts. ChemCatChem 2021. [DOI: 10.1002/cctc.202101123] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Hiroki Miura
- Department of Applied Chemistry for Environment Graduate School of Urban Environmental Sciences Tokyo Metropolitan University 1-1 Minami-Osawa Hachioji, Tokyo 192-0397 Japan
- Research Center for Hydrogen Energy-based Society 1-1 Minami-Osawa Hachioji, Tokyo 192-0397 Japan
- Elements Strategy Initiative for Catalysts & Batteries Kyoto University 1-30 Goryo-Ohara Nishikyo-ku, Kyoto 615-8245 Japan
| | - Ryuji Hirata
- Department of Applied Chemistry for Environment Graduate School of Urban Environmental Sciences Tokyo Metropolitan University 1-1 Minami-Osawa Hachioji, Tokyo 192-0397 Japan
| | - Toyomasu Tomoya
- Department of Applied Chemistry for Environment Graduate School of Urban Environmental Sciences Tokyo Metropolitan University 1-1 Minami-Osawa Hachioji, Tokyo 192-0397 Japan
| | - Tetsuya Shishido
- Department of Applied Chemistry for Environment Graduate School of Urban Environmental Sciences Tokyo Metropolitan University 1-1 Minami-Osawa Hachioji, Tokyo 192-0397 Japan
- Research Center for Hydrogen Energy-based Society 1-1 Minami-Osawa Hachioji, Tokyo 192-0397 Japan
- Elements Strategy Initiative for Catalysts & Batteries Kyoto University 1-30 Goryo-Ohara Nishikyo-ku, Kyoto 615-8245 Japan
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7
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Saito H, Shimokawa J, Yorimitsu H. The dioxasilepanyl group as a versatile organometallic unit: studies on stability, reactivity, and utility. Chem Sci 2021; 12:9546-9555. [PMID: 34349929 PMCID: PMC8278973 DOI: 10.1039/d1sc02083h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Accepted: 06/05/2021] [Indexed: 12/15/2022] Open
Abstract
Organic synthesis is performed based on precise choices of functional groups and reactions employed. In a multistep synthesis, an ideal functional group should be compatible with various reaction conditions and unaltered until it is subjected to a selective conversion. The current study was set out to search for a silicon functionality that meets these criteria. Here we have established a new silicon-based synthetic methodology centred on a bulky 7-membered dialkoxysilyl group (2,4,4,7,7-pentamethyl-1,3,2-dioxasilepan-2-yl) that uniquely has both stability and on-demand reactivity. The exceptional stability of this functional group was corroborated by both experimental and computational studies which demonstrated that key factors for its stability were a 7-membered structure and steric hindrance. In turn, the dioxasilepanyl group was found to become reactive and to be easily transformed in the presence of appropriate activators. Combined with the development of easy and robust methods to introduce the dioxasilepanyl group onto aryl rings, these findings have allowed a shorter and more efficient synthesis of a bioactive molecule, thus demonstrating the potential utility of the easily accessible dioxasilepanyl group in organic synthesis.
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Affiliation(s)
- Hayate Saito
- Department of Chemistry, Graduate School of Science, Kyoto University Sakyo-ku Kyoto 606-8502 Japan
| | - Jun Shimokawa
- Department of Chemistry, Graduate School of Science, Kyoto University Sakyo-ku Kyoto 606-8502 Japan
| | - Hideki Yorimitsu
- Department of Chemistry, Graduate School of Science, Kyoto University Sakyo-ku Kyoto 606-8502 Japan
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8
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Esteruelas MA, Martínez A, Oliván M, Oñate E. Kinetic Analysis and Sequencing of Si–H and C–H Bond Activation Reactions: Direct Silylation of Arenes Catalyzed by an Iridium-Polyhydride. J Am Chem Soc 2020; 142:19119-19131. [DOI: 10.1021/jacs.0c07578] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Miguel A. Esteruelas
- Departamento de Quı́mica Inorgánica, Instituto de Sı́ntesis Quı́mica y Catálisis Homogénea (ISQCH), Centro de Innovación en Quı́mica Avanzada (ORFEO−CINQA), Universidad de Zaragoza−CSIC, 50009 Zaragoza, Spain
| | - Antonio Martínez
- Departamento de Quı́mica Inorgánica, Instituto de Sı́ntesis Quı́mica y Catálisis Homogénea (ISQCH), Centro de Innovación en Quı́mica Avanzada (ORFEO−CINQA), Universidad de Zaragoza−CSIC, 50009 Zaragoza, Spain
| | - Montserrat Oliván
- Departamento de Quı́mica Inorgánica, Instituto de Sı́ntesis Quı́mica y Catálisis Homogénea (ISQCH), Centro de Innovación en Quı́mica Avanzada (ORFEO−CINQA), Universidad de Zaragoza−CSIC, 50009 Zaragoza, Spain
| | - Enrique Oñate
- Departamento de Quı́mica Inorgánica, Instituto de Sı́ntesis Quı́mica y Catálisis Homogénea (ISQCH), Centro de Innovación en Quı́mica Avanzada (ORFEO−CINQA), Universidad de Zaragoza−CSIC, 50009 Zaragoza, Spain
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9
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Guo C, Yang D, Liang M, Zhang X, Jiao H. Mechanistic Insights into the Chemo‐Selective Dehydrogenative Silylation of Alkenes Catalyzed by Bis(imino)pyridine Cobalt Complex from DFT Computations. ChemCatChem 2020. [DOI: 10.1002/cctc.202000272] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Cai‐Hong Guo
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials (Ministry of Education) School of Chemistry and Material Science Shanxi Normal University Linfen 041004 P. R. China
| | - Dandan Yang
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials (Ministry of Education) School of Chemistry and Material Science Shanxi Normal University Linfen 041004 P. R. China
| | - Min Liang
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials (Ministry of Education) School of Chemistry and Material Science Shanxi Normal University Linfen 041004 P. R. China
| | - Xiang Zhang
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials (Ministry of Education) School of Chemistry and Material Science Shanxi Normal University Linfen 041004 P. R. China
| | - Haijun Jiao
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock Albert-Einstein-Straße 29a 18059 Rostock Germany
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10
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Murai M, Nishinaka N, Enoki T, Takai K. Regioselective Sequential Silylation and Borylation of Aromatic Aldimines as a Strategy for Programming Synthesis of Multifunctionalized Benzene Derivatives. Org Lett 2020; 22:316-321. [PMID: 31850763 DOI: 10.1021/acs.orglett.9b04338] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Regioselective difunctionalization of two different C-H bonds in one pot using a three-component coupling reaction is described. The reaction order is important for controlling the reactivity and regioselectivity, and the first silylation promotes the second borylation. The introduced formyl, silyl, and boryl functional groups could be independently converted to other functional groups, and the substitution pattern for the resulting benzenes is difficult to access by conventional methods.
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Affiliation(s)
- Masahito Murai
- Division of Applied Chemistry, Graduate School of Natural Science and Technology , Okayama University , 3-1-1 Tsushimanaka , Kita-ku, Okayama 700-8530 , Japan.,Department of Chemistry, Graduate School of Science , Nagoya University , Furo, Chikusa, Nagoya 464-8602 , Japan
| | - Naoki Nishinaka
- Division of Applied Chemistry, Graduate School of Natural Science and Technology , Okayama University , 3-1-1 Tsushimanaka , Kita-ku, Okayama 700-8530 , Japan
| | - Takahiro Enoki
- Division of Applied Chemistry, Graduate School of Natural Science and Technology , Okayama University , 3-1-1 Tsushimanaka , Kita-ku, Okayama 700-8530 , Japan
| | - Kazuhiko Takai
- Division of Applied Chemistry, Graduate School of Natural Science and Technology , Okayama University , 3-1-1 Tsushimanaka , Kita-ku, Okayama 700-8530 , Japan
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11
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Iridium-Catalyzed Silylation. TOP ORGANOMETAL CHEM 2020. [DOI: 10.1007/3418_2020_55] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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12
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Murai M, Nishinaka N, Kimura M, Takai K. Regioselective Functionalization of 9,9-Dimethyl-9-silafluorenes by Borylation, Bromination, and Nitration. J Org Chem 2019; 84:5667-5676. [PMID: 30938531 DOI: 10.1021/acs.joc.9b00598] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Despite the utility of 9-silafluorenes as functional materials and as building blocks, methods for efficient functionalization of their backbone are rare, probably because of the presence of easily cleavable C-Si bonds. Although controlling the regioselectivity of iridium-catalyzed direct borylation of C-H bonds is difficult, we found that bromination and nitration of 2-methoxy-9-silafluorene under mild conditions occurred predominantly at the electron-rich position. The resulting product having methoxy and bromo groups can be utilized as a building block for the synthesis of unsymmetrically substituted 9-silafluorene-containing π-conjugated molecules.
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Affiliation(s)
- Masahito Murai
- Division of Applied Chemistry, Graduate School of Natural Science and Technology , Okayama University , 3-1-1 Tsushimanaka , Kita-ku, Okayama 700-8530 , Japan
| | - Naoki Nishinaka
- Division of Applied Chemistry, Graduate School of Natural Science and Technology , Okayama University , 3-1-1 Tsushimanaka , Kita-ku, Okayama 700-8530 , Japan
| | - Mizuki Kimura
- Division of Applied Chemistry, Graduate School of Natural Science and Technology , Okayama University , 3-1-1 Tsushimanaka , Kita-ku, Okayama 700-8530 , Japan
| | - Kazuhiko Takai
- Division of Applied Chemistry, Graduate School of Natural Science and Technology , Okayama University , 3-1-1 Tsushimanaka , Kita-ku, Okayama 700-8530 , Japan
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13
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Murai M, Nishimura K, Takai K. Palladium-catalyzed double-bond migration of unsaturated hydrocarbons accelerated by tantalum chloride. Chem Commun (Camb) 2019; 55:2769-2772. [PMID: 30768079 DOI: 10.1039/c9cc00223e] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The operationally simple palladium-catalyzed double-bond migration without heteroatom-containing coordinating functional groups is described. Addition of TaCl5 as a second catalyst greatly enhanced the migration efficiency to provide β-alkylstyrenes through migration of up to a five-carbon chain. Both catalysts were commercially available, and the reaction occurred without external ligands under neutral conditions. The reaction proceeded via generation of π-allyl palladium species, which enabled the chemoselective double-bond migration of hydrocarbons in the presence of allylethers. Remote functionalization through double-bond migration was also demonstrated using FeCl3 as a second catalyst.
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Affiliation(s)
- Masahito Murai
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, and Research Institute for Interdisciplinary Science, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan.
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14
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Minami Y, Hiyama T. Designing Cross-Coupling Reactions using Aryl(trialkyl)silanes. Chemistry 2018; 25:391-399. [PMID: 30024650 DOI: 10.1002/chem.201803213] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Revised: 07/18/2018] [Indexed: 01/08/2023]
Abstract
Organo(trialkyl)silanes have several advantages, including high stability, low toxicity, good solubility, easy handling, and ready availability compared with heteroatom-substituted silanes. However, methods for the cross-coupling of organo(trialkyl)silanes are limited, most probably because of their exceeding robustness. Thus, a practical method for the cross-coupling of organo(trialkyl)silanes has been a long-standing challenging research target. This article discusses how aryl(trialkyl)silanes can be used in cross-coupling reactions. A pioneering example is CuII catalytic conditions with the use of electron-accepting aryl- or heteroaryl(triethyl)silanes and aryl iodides. The reaction forms biaryls or teraryls. This design concept can be extended to Pd/CuII -catalyzed cross-coupling polymerization reactions between such silanes and aryl bromides or chlorides and to CuI -catalyzed alkylation using alkyl halides.
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Affiliation(s)
- Yasunori Minami
- Research and Development Initiative, Chuo University, 1-13-27, Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan
| | - Tamejiro Hiyama
- Research and Development Initiative, Chuo University, 1-13-27, Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan
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15
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Affiliation(s)
- Masahito Murai
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
| | - Kazuki Origuchi
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
| | - Kazuhiko Takai
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
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16
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Murai M, Nishinaka N, Takai K. Iridium-Catalyzed Sequential Silylation and Borylation of Heteroarenes Based on Regioselective C-H Bond Activation. Angew Chem Int Ed Engl 2018; 57:5843-5847. [PMID: 29573532 DOI: 10.1002/anie.201801229] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Revised: 03/06/2018] [Indexed: 12/30/2022]
Abstract
An iridium-catalyzed regioselective sequential silylation and borylation of heteroarenes was developed, which represents a rare example of unsymmetrical intermolecular C-H bond difunctionalization through the introduction of two different functionalities during a one-pot transformation. Although the substrate scope for the dehydrogenative silylation of heteroarenes has been limited mainly to electron-rich five-membered rings, the current reaction proceeds with both electron-rich and electron-deficient heteroarenes with the aid of heteroatom-directing C-H bond activation. The regioselectivity of the second borylation was controlled by both steric factors and the electronic effect of the silyl group installed in the first step. In combination with the classic cross-coupling reaction, this method provides rapid access to multisubstituted heteroarenes.
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Affiliation(s)
- Masahito Murai
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama, 700-8530, Japan
| | - Naoki Nishinaka
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama, 700-8530, Japan
| | - Kazuhiko Takai
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama, 700-8530, Japan
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17
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Murai M, Nishinaka N, Takai K. Iridium-Catalyzed Sequential Silylation and Borylation of Heteroarenes Based on Regioselective C−H Bond Activation. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201801229] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Masahito Murai
- Division of Applied Chemistry, Graduate School of Natural Science and Technology; Okayama University; 3-1-1 Tsushimanaka, Kita-ku Okayama 700-8530 Japan
| | - Naoki Nishinaka
- Division of Applied Chemistry, Graduate School of Natural Science and Technology; Okayama University; 3-1-1 Tsushimanaka, Kita-ku Okayama 700-8530 Japan
| | - Kazuhiko Takai
- Division of Applied Chemistry, Graduate School of Natural Science and Technology; Okayama University; 3-1-1 Tsushimanaka, Kita-ku Okayama 700-8530 Japan
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18
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Murai M, Nishiyama A, Nishinaka N, Morita H, Takai K. Iridium-catalysed hydrosilylation of cyclopropanes via regioselective carbon-carbon bond cleavage. Chem Commun (Camb) 2017; 53:9281-9284. [PMID: 28771260 DOI: 10.1039/c7cc04296e] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
While cyclopropanes have been explored as synthetically valuable building blocks, their transformation without conjugated substituents or directly substituted heteroatoms remains challenging. The current study describes the iridium-catalysed ring-opening hydrosilylation of cyclopropanes. A nitrogen-based directing group was found to control the reactivity of iridium active species as well as the regiochemistry of carbon-carbon bond cleavage and hydrosilylation.
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Affiliation(s)
- Masahito Murai
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, and Research Institute for Interdisciplinary Science, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan.
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19
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Murai M, Okada R, Asako S, Takai K. Rhodium-Catalyzed Silylative and Germylative Cyclization with Dehydrogenation Leading to 9-Sila- and 9-Germafluorenes: A Combined Experimental and Computational Mechanistic Study. Chemistry 2017; 23:10861-10870. [DOI: 10.1002/chem.201701579] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2017] [Indexed: 11/09/2022]
Affiliation(s)
- Masahito Murai
- Division of Applied Chemistry; Graduate School of Natural Science and Technology; Okayama University; 3-1-1 Tsushimanaka, Kita-ku Okayama 700-8530 Japan
| | - Ryo Okada
- Division of Applied Chemistry; Graduate School of Natural Science and Technology; Okayama University; 3-1-1 Tsushimanaka, Kita-ku Okayama 700-8530 Japan
| | - Sobi Asako
- Division of Applied Chemistry; Graduate School of Natural Science and Technology; Okayama University; 3-1-1 Tsushimanaka, Kita-ku Okayama 700-8530 Japan
| | - Kazuhiko Takai
- Division of Applied Chemistry; Graduate School of Natural Science and Technology; Okayama University; 3-1-1 Tsushimanaka, Kita-ku Okayama 700-8530 Japan
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20
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Murai M, Takeuchi Y, Takai K. Iridium-catalyzed Dehydrogenative Dimerization of Benzylmethylsilanes via Silylation of C(sp3)–H Bonds Adjacent to a Silicon Atom. CHEM LETT 2017. [DOI: 10.1246/cl.170369] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Masahito Murai
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530
| | - Yutaro Takeuchi
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530
| | - Kazuhiko Takai
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530
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21
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Komiyama T, Minami Y, Hiyama T. Aryl(triethyl)silanes for Biaryl and Teraryl Synthesis by Copper(II)-Catalyzed Cross-Coupling Reaction. Angew Chem Int Ed Engl 2016; 55:15787-15791. [DOI: 10.1002/anie.201608667] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2016] [Revised: 10/14/2016] [Indexed: 12/20/2022]
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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22
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Komiyama T, Minami Y, Hiyama T. Aryl(triethyl)silanes for Biaryl and Teraryl Synthesis by Copper(II)-Catalyzed Cross-Coupling Reaction. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201608667] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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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23
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Guo L, Chatupheeraphat A, Rueping M. Decarbonylative Silylation of Esters by Combined Nickel and Copper Catalysis for the Synthesis of Arylsilanes and Heteroarylsilanes. Angew Chem Int Ed Engl 2016; 55:11810-3. [PMID: 27560460 DOI: 10.1002/anie.201604696] [Citation(s) in RCA: 104] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Indexed: 12/13/2022]
Abstract
An efficient nickel/copper-catalyzed decarbonylative silylation reaction of carboxylic acid esters with silylboranes is described. This reaction provides access to structurally diverse silanes with high efficiency and excellent functional-group tolerance starting from readily available esters.
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Affiliation(s)
- Lin Guo
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Adisak Chatupheeraphat
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Magnus Rueping
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany. .,King Abdullah University of Science and Technology (KAUST), KAUST Catalysis Center (KCC), Thuwal, 23955-6900, Saudi Arabia.
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24
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Guo L, Chatupheeraphat A, Rueping M. Decarbonylative Silylation of Esters by Combined Nickel and Copper Catalysis for the Synthesis of Arylsilanes and Heteroarylsilanes. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201604696] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Lin Guo
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Adisak Chatupheeraphat
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Magnus Rueping
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
- King Abdullah University of Science and Technology (KAUST); KAUST Catalysis Center (KCC); Thuwal 23955-6900 Saudi Arabia
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25
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Murai M, Okada R, Nishiyama A, Takai K. Synthesis and Properties of Sila[n]helicenes via Dehydrogenative Silylation of C-H Bonds under Rhodium Catalysis. Org Lett 2016; 18:4380-3. [PMID: 27513028 DOI: 10.1021/acs.orglett.6b02134] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Use of a rhodium catalyst with (R)-(S)-BPPFA ligand allows efficient synthesis of sila[n]helicenes via dehydrogenative silylation of C-H bonds. By selecting the proper ligands, the current method provides the ability to prepare unsymmetrical sila[n]helicene derivatives without any oxidants. The resulting sila[6]helicene is a rare example of a five-membered ring-fused [6]helicene, which was isolated as a single pure enantiomer without substituents on the terminal benzene rings.
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Affiliation(s)
- Masahito Murai
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, and ‡Research Center of New Functional Materials for Energy Production, Storage and Transport, Okayama University , 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
| | - Ryo Okada
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, and ‡Research Center of New Functional Materials for Energy Production, Storage and Transport, Okayama University , 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
| | - Atsushi Nishiyama
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, and ‡Research Center of New Functional Materials for Energy Production, Storage and Transport, Okayama University , 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
| | - Kazuhiko Takai
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, and ‡Research Center of New Functional Materials for Energy Production, Storage and Transport, Okayama University , 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
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26
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Murai M, Takeuchi Y, Yamauchi K, Kuninobu Y, Takai K. Rhodium-Catalyzed Synthesis of Chiral Spiro-9-silabifluorenes by Dehydrogenative Silylation: Mechanistic Insights into the Construction of Tetraorganosilicon Stereocenters. Chemistry 2016; 22:6048-58. [DOI: 10.1002/chem.201504718] [Citation(s) in RCA: 91] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Revised: 01/26/2016] [Indexed: 11/09/2022]
Affiliation(s)
- Masahito Murai
- Division of Applied Chemistry; Graduate School of Natural Science and Technology; Okayama University; 3-1-1 Tsushimanaka, Kita-ku Okayama 700-8530 Japan
| | - Yutaro Takeuchi
- Division of Applied Chemistry; Graduate School of Natural Science and Technology; Okayama University; 3-1-1 Tsushimanaka, Kita-ku Okayama 700-8530 Japan
| | - Kanae Yamauchi
- Division of Applied Chemistry; Graduate School of Natural Science and Technology; Okayama University; 3-1-1 Tsushimanaka, Kita-ku Okayama 700-8530 Japan
| | - Yoichiro Kuninobu
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
| | - Kazuhiko Takai
- Division of Applied Chemistry; Graduate School of Natural Science and Technology; Okayama University; 3-1-1 Tsushimanaka, Kita-ku Okayama 700-8530 Japan
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27
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Ma Y, Wang B, Zhang L, Hou Z. Boron-Catalyzed Aromatic C-H Bond Silylation with Hydrosilanes. J Am Chem Soc 2016; 138:3663-6. [PMID: 26959863 DOI: 10.1021/jacs.6b01349] [Citation(s) in RCA: 131] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Metal-free catalytic C-H silylation of a series of aromatic compounds such as N,N-disubstituted anilines with various hydrosilanes has been achieved for the first time using commercially available B(C6F5)3 as a catalyst. This protocol features simple and neutral reaction conditions, high regioselectivity, wide substrate scope (up to 40 examples), Si-Cl bond compatibility, and no requirement for a hydrogen acceptor.
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Affiliation(s)
- Yuanhong Ma
- Organometallic Chemistry Laboratory and RIKEN Center for Sustainable Resource Science, RIKEN , 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Baoli Wang
- Organometallic Chemistry Laboratory and RIKEN Center for Sustainable Resource Science, RIKEN , 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Liang Zhang
- Organometallic Chemistry Laboratory and RIKEN Center for Sustainable Resource Science, RIKEN , 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Zhaomin Hou
- Organometallic Chemistry Laboratory and RIKEN Center for Sustainable Resource Science, RIKEN , 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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28
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Palladium‐Catalyzed Direct Arylation of Azulene Based on Regioselective C−H Bond Activation. ASIAN J ORG CHEM 2016. [DOI: 10.1002/ajoc.201600062] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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29
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Lee KS, Katsoulis D, Choi J. Intermolecular C–H Silylation of Arenes and Heteroarenes with HSiEt3 under Operationally Diverse Conditions: Neat/Stoichiometric and Acceptor/Acceptorless. ACS Catal 2016. [DOI: 10.1021/acscatal.5b02806] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kang-sang Lee
- Dow Corning Corporation, 2200 West Salzburg Road, Auburn, Michigan 48611, United States
| | - Dimitris Katsoulis
- Dow Corning Corporation, 2200 West Salzburg Road, Auburn, Michigan 48611, United States
| | - Jongwook Choi
- Dow Corning Corporation, 2200 West Salzburg Road, Auburn, Michigan 48611, United States
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30
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Bheeter CB, Chen L, Soulé JF, Doucet H. Regioselectivity in palladium-catalysed direct arylation of 5-membered ring heteroaromatics. Catal Sci Technol 2016. [DOI: 10.1039/c5cy02095f] [Citation(s) in RCA: 168] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
In the past few years, several results using modified catalysts and new reaction conditions have been reported permitting better control of the regioselectivity of Pd-catalysed arylations.
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Affiliation(s)
- Charles Beromeo Bheeter
- Organometalliques, Matériaux et Catalyse
- Institut des Sciences Chimiques de Rennes
- UMR 6226 CNRS-Université de Rennes 1
- 35042 Rennes
- France
| | - Lu Chen
- Organometalliques, Matériaux et Catalyse
- Institut des Sciences Chimiques de Rennes
- UMR 6226 CNRS-Université de Rennes 1
- 35042 Rennes
- France
| | - Jean-François Soulé
- Organometalliques, Matériaux et Catalyse
- Institut des Sciences Chimiques de Rennes
- UMR 6226 CNRS-Université de Rennes 1
- 35042 Rennes
- France
| | - Henri Doucet
- Organometalliques, Matériaux et Catalyse
- Institut des Sciences Chimiques de Rennes
- UMR 6226 CNRS-Université de Rennes 1
- 35042 Rennes
- France
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31
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Schnapperelle I, Breitenlechner S, Bach T. Kinetic Studies on the Palladium(II)-Catalyzed Oxidative Cross-Coupling of Thiophenes with Arylboron Compounds and Their Mechanistic Implications. Chemistry 2015; 21:18407-16. [DOI: 10.1002/chem.201503067] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2015] [Indexed: 12/28/2022]
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32
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Roy D, Maekawa H, Murai M, Takai K. Short Synthesis of [5]- and [7]Phenacenes with Silyl Groups at the Axis Positions. Chem Asian J 2015. [DOI: 10.1002/asia.201500700] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- David Roy
- Division of Applied Chemistry; Graduate School of Natural Science and Technology, Okayama University; 3-1-1 Tsushimanaka, Kita-ku Okayama 700-8530 Japan
| | - Hiroyuki Maekawa
- Division of Applied Chemistry; Graduate School of Natural Science and Technology, Okayama University; 3-1-1 Tsushimanaka, Kita-ku Okayama 700-8530 Japan
| | - Masahito Murai
- Division of Applied Chemistry; Graduate School of Natural Science and Technology, Okayama University; 3-1-1 Tsushimanaka, Kita-ku Okayama 700-8530 Japan
| | - Kazuhiko Takai
- Division of Applied Chemistry; Graduate School of Natural Science and Technology, Okayama University; 3-1-1 Tsushimanaka, Kita-ku Okayama 700-8530 Japan
- ACT-C (Japan) Science and Technology Agency; 4-1-8 Honcho, Kawaguchi Saitama 332-0012 Japan
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33
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Xu Z, Xu LW. Silylations of Arenes with Hydrosilanes: From Transition-Metal-Catalyzed C¢X Bond Cleavage to Environmentally Benign Transition-Metal-Free C¢H Bond Activation. CHEMSUSCHEM 2015; 8:2176-2179. [PMID: 26073645 DOI: 10.1002/cssc.201500467] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2015] [Indexed: 06/04/2023]
Abstract
The construction of carbon-silicon bonds is highlighted as an exciting achievement in the field of organosilicon chemistry and green chemistry. Recent developments in this area will enable the sustainable chemical conversion of silicon resources into synthetically useful compounds. Especially, the catalytic silylation through C¢H bond activation without directing groups and hydrogen acceptors is one of the most challenging topics in organic chemistry and green chemistry. These remarkable findings on catalytic silylation can pave the way to a more environmentally benign utilization of earth-abundant silicon-based resources in synthetic chemistry.
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Affiliation(s)
- Zheng Xu
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, No. 1378, Wenyi West Road, Science Park of Hangzhou Normal University, Hangzhou City, 311121 (PR China)
| | - Li-Wen Xu
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, No. 1378, Wenyi West Road, Science Park of Hangzhou Normal University, Hangzhou City, 311121 (PR China).
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou (PR China).
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34
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Murai M, Matsumoto K, Takeuchi Y, Takai K. Rhodium-Catalyzed Synthesis of Benzosilolometallocenes via the Dehydrogenative Silylation of C(sp2)–H Bonds. Org Lett 2015; 17:3102-5. [DOI: 10.1021/acs.orglett.5b01373] [Citation(s) in RCA: 103] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Masahito Murai
- Division of Applied Chemistry, Graduate School of
Natural Science
and Technology and ‡Research Center of New Functional Materials for Energy Production,
Storage and Transport, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
| | - Koji Matsumoto
- Division of Applied Chemistry, Graduate School of
Natural Science
and Technology and ‡Research Center of New Functional Materials for Energy Production,
Storage and Transport, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
| | - Yutaro Takeuchi
- Division of Applied Chemistry, Graduate School of
Natural Science
and Technology and ‡Research Center of New Functional Materials for Energy Production,
Storage and Transport, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
| | - Kazuhiko Takai
- Division of Applied Chemistry, Graduate School of
Natural Science
and Technology and ‡Research Center of New Functional Materials for Energy Production,
Storage and Transport, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
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35
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Murai M, Takeshima H, Morita H, Kuninobu Y, Takai K. Acceleration Effects of Phosphine Ligands on the Rhodium-Catalyzed Dehydrogenative Silylation and Germylation of Unactivated C(sp(3))-H Bonds. J Org Chem 2015; 80:5407-14. [PMID: 25961415 DOI: 10.1021/acs.joc.5b00920] [Citation(s) in RCA: 92] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The current work describes the marked rate of acceleration caused by phosphine ligands on the rhodium-catalyzed dehydrogenative silylation and germylation of unactivated C(sp(3))-H bonds. The reactivity was affected by the steric and electronic nature of the phosphine ligands. The use of the bulky and electron-rich diphosphine ligand (R)-DTBM-SEGPHOS was highly effective to yield the dehydrogenative silylation products selectively in the presence of a hydrogen acceptor. An appropriate choice of C2-symmetric chiral diphosphine ligand enables the asymmetric dehydrogenative silylation via the enantioselective desymmetrization of the C(sp(3))-H bond. The unprecedented catalytic germylation of C(sp(3))-H bonds with dehydrogenation was also examined with the combination of the rhodium complex and a wide bite angle diphosphine ligand to provide the corresponding 2,3-dihydrobenzo[b]germoles in good yield.
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Affiliation(s)
| | | | | | - Yoichiro Kuninobu
- ‡Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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36
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Murai M, Takami K, Takeshima H, Takai K. Iridium-Catalyzed Dehydrogenative Silylation of Azulenes Based on Regioselective C–H Bond Activation. Org Lett 2015; 17:1798-801. [DOI: 10.1021/acs.orglett.5b00575] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | | | - Kazuhiko Takai
- ACT-C, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
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