1
|
Sokolnicki T, Alharbi MM, van Ingen Y, Rahim S, Pramanik M, Roldan A, Walkowiak J, Melen RL. Reactivity of a series of triaryl borates, B(OAr x) 3, in hydroboration catalysis. Dalton Trans 2023; 52:16118-16122. [PMID: 37901910 DOI: 10.1039/d3dt03333c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2023]
Abstract
In this paper, we compare the reactivity of a series of triaryl borates B(OArx)3 as catalysts for the hydroboration of alkenes and alkynes. It was observed that commercially available B(OPh)3 performed the poorest, whereas catalysts with o-F atoms appeared to perform much better.
Collapse
Affiliation(s)
- Tomasz Sokolnicki
- Cardiff Catalysis Institute, Cardiff University, Translational Research Hub, Maindy Road, Cathays, Cardiff, CF24 4HQ Wales, UK.
- Adam Mickiewicz University, Faculty of Chemistry, Uniwersytetu Poznanskiego 8, 61-614, Poznan, Poland.
- Adam Mickiewicz University, Center for Advanced Technology, Uniwersytetu Poznanskiego 10, 61-614, Poznan, Poland
| | - Mashael M Alharbi
- Cardiff Catalysis Institute, Cardiff University, Translational Research Hub, Maindy Road, Cathays, Cardiff, CF24 4HQ Wales, UK.
- Department of Chemistry, King Faisal University, College of Science, P.O. Box 400, Al-Ahsa 31982, Saudi Arabia
| | - Yara van Ingen
- Cardiff Catalysis Institute, Cardiff University, Translational Research Hub, Maindy Road, Cathays, Cardiff, CF24 4HQ Wales, UK.
| | - Shahnaz Rahim
- Cardiff Catalysis Institute, Cardiff University, Translational Research Hub, Maindy Road, Cathays, Cardiff, CF24 4HQ Wales, UK.
- Department of Chemistry, Abdul Wali Khan University, Mardan, Pakistan
| | - Milan Pramanik
- Cardiff Catalysis Institute, Cardiff University, Translational Research Hub, Maindy Road, Cathays, Cardiff, CF24 4HQ Wales, UK.
| | - Alberto Roldan
- Cardiff Catalysis Institute, Cardiff University, Translational Research Hub, Maindy Road, Cathays, Cardiff, CF24 4HQ Wales, UK.
| | - Jędrzej Walkowiak
- Adam Mickiewicz University, Center for Advanced Technology, Uniwersytetu Poznanskiego 10, 61-614, Poznan, Poland
| | - Rebecca L Melen
- Cardiff Catalysis Institute, Cardiff University, Translational Research Hub, Maindy Road, Cathays, Cardiff, CF24 4HQ Wales, UK.
| |
Collapse
|
2
|
Alharbi MM, van Ingen Y, Roldan A, Kaehler T, Melen RL. Synthesis and lewis acidity of fluorinated triaryl borates. Dalton Trans 2023; 52:1820-1825. [PMID: 36661186 DOI: 10.1039/d2dt04095f] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
A series of fluorinated triaryl borates B(OArF)3 (ArF = 2-FC6H4, 3-FC6H4, 4-FC6H4, 2,4-F2C6H3, 3,5-F2C6H3, 2,3,4-F3C6H2, 2,4,6-F3C6H2, 3,4,5-F3C6H2) have been prepared and isolated from the reactions of the mono-, di-, or tri-fluorophenol with BCl3. The Lewis acidity of these borates has been determined by NMR spectroscopic and theoretical methods and compared to their well-established borane counterpart.
Collapse
Affiliation(s)
- Mashael M Alharbi
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, Cymru/Wales, UK. .,Department of Chemistry, King Faisal University, College of Science, P.O. Box 400, Al-Ahsa 31982, Saudi Arabia
| | - Yara van Ingen
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, Cymru/Wales, UK.
| | - Alberto Roldan
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, Cymru/Wales, UK.
| | - Tanja Kaehler
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, Cymru/Wales, UK.
| | - Rebecca L Melen
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, Cymru/Wales, UK.
| |
Collapse
|
3
|
Willcox DR, Thomas SP. Group 13 exchange and transborylation in catalysis. Beilstein J Org Chem 2023; 19:325-348. [PMID: 36998308 PMCID: PMC10043741 DOI: 10.3762/bjoc.19.28] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Accepted: 02/24/2023] [Indexed: 04/01/2023] Open
Abstract
Catalysis is dominated by the use of rare and potentially toxic transition metals. The main group offers a potentially sustainable alternative for catalysis, due to the generally higher abundance and lower toxicity of these elements. Group 13 elements have a rich catalogue of stoichiometric addition reactions to unsaturated bonds but cannot undergo the redox chemistry which underpins transition-metal catalysis. Group 13 exchange reactions transfer one or more groups from one group 13 element to another, through σ-bond metathesis; where boron is both of the group 13 elements, this is termed transborylation. These redox-neutral processes are increasingly being used to render traditionally stoichiometric group 13-mediated processes catalytic and develop new catalytic processes, examples of which are the focus of this review.
Collapse
Affiliation(s)
- Dominic R Willcox
- EaStCHEM School of Chemistry, University of Edinburgh, Edinburgh, EH9 3FJ, United Kingdom
| | - Stephen P Thomas
- EaStCHEM School of Chemistry, University of Edinburgh, Edinburgh, EH9 3FJ, United Kingdom
| |
Collapse
|
4
|
An in situ study of the thermal decomposition of 2,2′-azobis(2-methylpropionitrile) radical chemistry using a dual-mode EPR resonator. RESEARCH ON CHEMICAL INTERMEDIATES 2022. [DOI: 10.1007/s11164-022-04861-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractA custom-built dual-mode EPR resonator was used to study the radical chemistry of AIBN thermal decomposition. This resonator enables both simultaneous in situ heating using microwaves and EPR measurements to be performed. The thermal decomposition of AIBN was compared following conventional heating methods and microwave-induced (or dielectric) heating methods. Under both heating conditions, the radicals formed and detected by EPR include the 2-cyano-2-propyl (CP●) and 2-cyano-2-propoxyl (CPO●) radicals. Under aerobic conditions, the observed relative distribution of these radicals as observed by EPR is similar following slow heating by conventional or dielectric methods. In both conditions, the kinetically favoured CPO● radicals and their adducts dominate the EPR spectra up to temperatures of approximately 80–90 °C. Under anaerobic conditions, the distribution can be altered as less CPO● is available. However, the observed results are notably different when rapid heating (primarily applied using a MW-induced T-jump) is applied. As the higher reaction temperatures are achieved on a faster timescale, none of the ST●-CPO adducts are actually visible in the EPR spectra. The more rapid and facile heating capabilities created by microwaves may therefore lead to the non-detection of radical intermediates compared to experiments performed using conventional heating methods.
Collapse
|
5
|
Kumar R, Dutta S, Sharma V, Singh PP, Gonnade RG, Koley D, Sen SS. Monomeric Magnesium Catalyzed Alkene and Alkyne Hydroboration. Chemistry 2022; 28:e202201896. [DOI: 10.1002/chem.202201896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Indexed: 11/10/2022]
Affiliation(s)
- Rohit Kumar
- Inorganic Chemistry and Catalysis Division CSIR-National Chemical Laboratory Dr. Homi Bhabha Road, Pashan Pune 411008 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India
| | - Sayan Dutta
- Department of Chemical Sciences Indian Institute of Science Education and Research (IISER) Kolkata Mohanpur 741246 India
| | - Vishal Sharma
- Inorganic Chemistry and Catalysis Division CSIR-National Chemical Laboratory Dr. Homi Bhabha Road, Pashan Pune 411008 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India
| | - Praval P. Singh
- Department of Chemical Sciences Indian Institute of Science Education and Research (IISER) Kolkata Mohanpur 741246 India
| | - Rajesh G. Gonnade
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India
- Physical and Materials Chemistry Catalysis Division CSIR-National Chemical Laboratory Dr. Homi Bhabha Road, Pashan Pune 411008 India
| | - Debasis Koley
- Department of Chemical Sciences Indian Institute of Science Education and Research (IISER) Kolkata Mohanpur 741246 India
| | - Sakya S. Sen
- Inorganic Chemistry and Catalysis Division CSIR-National Chemical Laboratory Dr. Homi Bhabha Road, Pashan Pune 411008 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India
| |
Collapse
|
6
|
Banerjee S, Vanka K. Computational insights into hydroboration with acyclic α-Borylamido-germylene and stannylene catalysts: Cooperative dual catalysis the key to system efficiency. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.115907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
7
|
Altarejos J, Valero A, Manzano R, Carreras J. Synthesis of Tri‐ and Tetrasubstituted Alkenyl Boronates from Alkynes. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200521] [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)
- Julia Altarejos
- Universidad de Alcalá Facultad de Ciencias: Universidad de Alcala Facultad de Ciencias Química Orgánica y Química Inorgánica SPAIN
| | - Antonio Valero
- Universidad de Alcalá Facultad de Ciencias: Universidad de Alcala Facultad de Ciencias Química Orgánica y Química Inorgánica SPAIN
| | - Rubén Manzano
- Universidad de Alcalá Facultad de Ciencias: Universidad de Alcala Facultad de Ciencias Química Orgánica y Química Inorgánica SPAIN
| | - Javier Carreras
- Universidad de Alcalá Facultad de Ciencias: Universidad de Alcala Facultad de Ciencias Química Orgánica y Química Inorgánica Carretera Madrid-Barcelona km 33,6, Campus Universitario.Facultad de Farmacia 28805 Alcalá de Henares SPAIN
| |
Collapse
|
8
|
Lei S, Pan T, Wang M, Zhang Y. Fe-catalyzed reduction of aldimines with HBpin. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.153949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
9
|
Abstract
This review highlights the hydroelementation reactions of conjugated and separated diynes, which depending on the process conditions, catalytic system, as well as the type of reagents, leads to the formation of various products: enynes, dienes, allenes, polymers, or cyclic compounds. The presence of two triple bonds in the diyne structure makes these compounds important reagents but selective product formation is often difficult owing to problems associated with maintaining appropriate reaction regio- and stereoselectivity. Herein we review this topic to gain knowledge on the reactivity of diynes and to systematise the range of information relating to their use in hydroelementation reactions. The review is divided according to the addition of the E-H (E = Mg, B, Al, Si, Ge, Sn, N, P, O, S, Se, Te) bond to the triple bond(s) in the diyne, as well as to the type of the reagent used, and the product formed. Not only are the hydroelementation reactions comprehensively discussed, but the synthetic potential of the obtained products is also presented. The majority of published research is included within this review, illustrating the potential as well as limitations of these processes, with the intent to showcase the power of these transformations and the obtained products in synthesis and materials chemistry.
Collapse
Affiliation(s)
- Jędrzej Walkowiak
- Adam Mickiewicz University in Poznan, Center for Advanced Technology, Uniwersytetu Poznanskiego 10, 61-614, Poznan.
| | - Jakub Szyling
- Adam Mickiewicz University in Poznan, Center for Advanced Technology, Uniwersytetu Poznanskiego 10, 61-614, Poznan. .,Adam Mickiewicz University in Poznan, Faculty of Chemistry, Uniwersytetu Poznanskiego 8, 61-614, Poznan, Poland
| | - Adrian Franczyk
- Adam Mickiewicz University in Poznan, Center for Advanced Technology, Uniwersytetu Poznanskiego 10, 61-614, Poznan.
| | - Rebecca L Melen
- Cardiff Catalysis Institute, Cardiff University, School of Chemistry, Park Place, Main Building, Cardiff CF10 3AT, Cymru/Wales, UK.
| |
Collapse
|
10
|
Abstract
In the last two decades, boron-based catalysis has been gaining increasing traction in the field of organic synthesis. The use of halogenated triarylboranes as main group Lewis acid catalysts is an attractive strategy. It has been applied in a growing number of transformations over the years, where they may perform comparably or even better than the gold standard catalysts. This review discusses methods of borane synthesis and cutting-edge boron-based Lewis acid catalysis, focusing especially on tris(pentafluorophenyl)-borane [B(C6F5)3], and other halogenated triarylboranes, highlighting how boron Lewis acids employed as catalysts can unlock a plethora of unprecedented chemical transformations or improve the efficiency of existing reactions.
Collapse
|
11
|
Ankur, Kannan R, Chambenahalli R, Banerjee S, Yang Y, Maron L, Venugopal A. [(Me
6
TREN)MgOCHPh
2
][B(C
6
F
5
)
4
]: A Model Complex to Explore the Catalytic Activity of Magnesium Alkoxides in Ketone Hydroboration. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100651] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Ankur
- School of Chemistry Indian Institute of Science Education and Research Thiruvananthapuram Vithura Thiruvananthapuram 695551 India
| | - Ramkumar Kannan
- School of Chemistry Indian Institute of Science Education and Research Thiruvananthapuram Vithura Thiruvananthapuram 695551 India
| | - Raju Chambenahalli
- School of Chemistry Indian Institute of Science Education and Research Thiruvananthapuram Vithura Thiruvananthapuram 695551 India
| | - Sumanta Banerjee
- School of Chemistry Indian Institute of Science Education and Research Thiruvananthapuram Vithura Thiruvananthapuram 695551 India
| | - Yan Yang
- LPCNO, UMR 5215, INSA, UPS Université de Toulouse-CNRS 31000 Toulouse France
| | - Laurent Maron
- LPCNO, UMR 5215, INSA, UPS Université de Toulouse-CNRS 31000 Toulouse France
| | - Ajay Venugopal
- School of Chemistry Indian Institute of Science Education and Research Thiruvananthapuram Vithura Thiruvananthapuram 695551 India
| |
Collapse
|
12
|
Bole LJ, Uzelac M, Hernán-Gómez A, Kennedy AR, O'Hara CT, Hevia E. Progressing the Frustrated Lewis Pair Abilities of N-Heterocyclic Carbene/GaR 3 Combinations for Catalytic Hydroboration of Aldehydes and Ketones. Inorg Chem 2021; 60:13784-13796. [PMID: 34191489 DOI: 10.1021/acs.inorgchem.1c01276] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Exploiting the steric incompatibility of the tris(alkyl)gallium GaR3 (R = CH2SiMe3) and the bulky N-heterocyclic carbene (NHC) 1,3-bis(tert-butyl)imidazol-2-ylidene (ItBu), here we report the B-H bond activation of pinacolborane (HBPin), which has led to the isolation and structural authentication of a novel ion pair, [{ItBu-BPin}+{GaR3(μ-H)GaR3}-] (2). Contrastingly, neither ItBu or GaR3 was able to react with HBPin under the conditions of this study. Combining an NHC-stabilized borenium cation, [{ItBu-BPin}+], with an anionic dinuclear gallate, [{GaR3(μ-H)GaR3}-], 2 proved to be unstable in solution at room temperature, evolving to the abnormal NHC-Ga complex [BPinC{{N(tBu)]2CHCGa(R)3}] (3). Interestingly, the structural isomer of 2, with the borenium cation residing at the C4 position of the carbene, [{aItBu-BPin}+{GaR3(μ-H)GaR3}-] (4), was obtained when the abnormal NHC complex [aItBu·GaR3] (1) was heated to 70 °C with HBPin, demonstrating that, under these forced conditions, it is possible to induce thermal frustration of the Lewis base/Lewis acid components of 1, enabling the activation of HBPin. Building on these stoichiometric studies, the frustrated Lewis pair (FLP) reactivity observed for the GaR3/ItBu combination with HBPin could then be upgraded to catalytic regimes, allowing the efficient hydroboration of a range of aldehydes and ketones under mild reaction conditions. Mechanistic insights into the possible reaction pathway involved in this process have been gained by combining kinetic investigations with a comparative study of the catalytic capabilities of several gallium and borenium species related to 2. Disclosing a new cooperative partnership, reactions are proposed to occur via the formation of a highly reactive monomeric hydride gallate, [{ItBu-BPin}+{GaR3(H)}-] (I). Each anionic and cationic component of I plays a key role for success of the hydroboration, with the nucleophilic monomeric gallate anion favoring the transfer of its hydride to the C═O bond of the organic substate, which in turn is activated by coordination to the borenium cation.
Collapse
Affiliation(s)
- Leonie J Bole
- Department für Chemie, Biochemie und Pharmazie, Universität Bern, Bern CH3012, Switzerland
| | - Marina Uzelac
- Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow G1 1XL, United Kingdom
| | - Alberto Hernán-Gómez
- Departamento de Química Orgánica y Química Inorgánica, Universidad de Alcalá, Alcalá de Henares-Madrid 28805, Spain
| | - Alan R Kennedy
- Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow G1 1XL, United Kingdom
| | - Charles T O'Hara
- Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow G1 1XL, United Kingdom
| | - Eva Hevia
- Department für Chemie, Biochemie und Pharmazie, Universität Bern, Bern CH3012, Switzerland
| |
Collapse
|
13
|
Kamal MM, Liu Z, Zhai S, Vidović D. Imine Reduction with Me 2S-BH 3. Molecules 2021; 26:5443. [PMID: 34576911 PMCID: PMC8467297 DOI: 10.3390/molecules26185443] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 08/30/2021] [Accepted: 09/02/2021] [Indexed: 11/25/2022] Open
Abstract
Although there exists a variety of different catalysts for hydroboration of organic substrates such as aldehydes, ketones, imines, nitriles etc., recent evidence suggests that tetra-coordinate borohydride species, formed by activation, redistribution, or decomposition of boron reagents, are the true hydride donors. We then proposed that Me2S-BH3 could also act as a hydride donor for the reduction of various imines, as similar compounds have been observed to reduce carbonyl substrates. This boron reagent was shown to be an effective and chemoselective hydroboration reagent for a wide variety of imines.
Collapse
Affiliation(s)
- Mohammad M. Kamal
- School of Chemistry, Faculty of Sciences, Monash University, Clayton 3800, Australia; (M.M.K.); (Z.L.); (S.Z.)
| | - Zhizhou Liu
- School of Chemistry, Faculty of Sciences, Monash University, Clayton 3800, Australia; (M.M.K.); (Z.L.); (S.Z.)
- Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, China
| | - Siyuan Zhai
- School of Chemistry, Faculty of Sciences, Monash University, Clayton 3800, Australia; (M.M.K.); (Z.L.); (S.Z.)
| | - Dragoslav Vidović
- School of Chemistry, Faculty of Sciences, Monash University, Clayton 3800, Australia; (M.M.K.); (Z.L.); (S.Z.)
| |
Collapse
|
14
|
Singh A, Maji A, Joshi M, Choudhury AR, Ghosh K. Designed pincer ligand supported Co(II)-based catalysts for dehydrogenative activation of alcohols: Studies on N-alkylation of amines, α-alkylation of ketones and synthesis of quinolines. Dalton Trans 2021; 50:8567-8587. [PMID: 34075925 DOI: 10.1039/d0dt03748f] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Base-metal catalysts Co1, Co2 and Co3 were synthesized from designed pincer ligands L1, L2 and L3 having NNN donor atoms respectively. Co1, Co2 and Co3 were characterized by IR, UV-Vis. and ESI-MS spectroscopic studies. Single crystal X-ray diffraction studies were investigated to authenticate the molecular structures of Co1 and Co3. Catalysts Co1, Co2 and Co3 were utilized to study the dehydrogenative activation of alcohols for N-alkylation of amines, α-alkylation of ketones and synthesis of quinolines. Under optimized reaction conditions, a broad range of substrates including alcohols, anilines and ketones were exploited. A series of control experiments for N-alkylation of amines, α-alkylation of ketones and synthesis of quinolines were examined to understand the reaction pathway. ESI-MS spectral studies were investigated to characterize cobalt-alkoxide and cobalt-hydride intermediates. Reduction of styrene by evolved hydrogen gas during the reaction was investigated to authenticate the dehydrogenative nature of the catalysts. Probable reaction pathways were proposed for N-alkylation of amines, α-alkylation of ketones and synthesis of quinolines on the basis of control experiments and detection of reaction intermediates.
Collapse
Affiliation(s)
- Anshu Singh
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee-247667, Uttarakhand, India.
| | | | | | | | | |
Collapse
|
15
|
Ton NNH, Mai BK, Nguyen TV. Tropylium-Promoted Hydroboration Reactions: Mechanistic Insights Via Experimental and Computational Studies. J Org Chem 2021; 86:9117-9133. [PMID: 34134487 DOI: 10.1021/acs.joc.1c01208] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Hydroboration reaction of alkynes is one of the most synthetically powerful tools to access organoboron compounds, versatile precursors for cross-coupling chemistry. This type of reaction has traditionally been mediated by transition-metal or main group catalysts. Herein, we report a novel method using tropylium salts, typically known as organic oxidants and Lewis acids, to promote the hydroboration reaction of alkynes. A broad range of vinylboranes can be easily accessed via this metal-free protocol. Similar hydroboration reactions of alkenes and epoxides can also be efficiently catalyzed by the same tropylium catalysts. Experimental studies and DFT calculations suggested that the reaction follows an uncommon mechanistic pathway, which is triggered by the hydride abstraction of pinacolborane with tropylium ion. This is followed by a series of in situ counterion-activated substituent exchanges to generate boron intermediates that promote the hydroboration reaction.
Collapse
Affiliation(s)
- Nhan N H Ton
- School of Chemistry, University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Binh Khanh Mai
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Thanh Vinh Nguyen
- School of Chemistry, University of New South Wales, Sydney, New South Wales 2052, Australia
| |
Collapse
|
16
|
Stoian C, Olaru M, Cucuiet TA, Kegyes KT, Sava A, Timoshkin AY, Raţ CI, Beckmann J. Bulky Polyfluorinated Terphenyldiphenylboranes: Water Tolerant Lewis Acids. Chemistry 2021; 27:4327-4331. [PMID: 33368648 PMCID: PMC7986919 DOI: 10.1002/chem.202005367] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Indexed: 11/23/2022]
Abstract
Protocols for the synthesis of the bulky polyfluorinated triarylboranes 2,6‐(C6F5)2C6F3B(C6F5)2 (1), 2,6‐(C6F5)2C6F3B[3,5‐(CF3)2C6H3] (2), 2,4,6‐(C6F5)3C6H2B(C6F5)2 (3), 2,4,6‐(C6F5)3C6H2B[3,5‐(CF3)2C6H3] (4) were developed. All boranes are water tolerant and according to the Gutmann‐Beckett method, 1–3 display Lewis acidities larger than that of the prominent B(C6F5)3.
Collapse
Affiliation(s)
- Corina Stoian
- Institut für Anorganische Chemie und Kristallographie, Universität Bremen, Leobener Straße 7, 28359, Bremen, Germany.,Department of Chemistry, Supramolecular Organic and Organometallic Chemistry Centre (SOOMCC), Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, Arany János Steet 11, 400028, Cluj-Napoca, Romania
| | - Marian Olaru
- Institut für Anorganische Chemie und Kristallographie, Universität Bremen, Leobener Straße 7, 28359, Bremen, Germany
| | - Teodor A Cucuiet
- Department of Chemistry, Supramolecular Organic and Organometallic Chemistry Centre (SOOMCC), Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, Arany János Steet 11, 400028, Cluj-Napoca, Romania
| | - Krisztina T Kegyes
- Department of Chemistry, Supramolecular Organic and Organometallic Chemistry Centre (SOOMCC), Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, Arany János Steet 11, 400028, Cluj-Napoca, Romania
| | - Alexandru Sava
- Department of Chemistry, Supramolecular Organic and Organometallic Chemistry Centre (SOOMCC), Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, Arany János Steet 11, 400028, Cluj-Napoca, Romania
| | - Alexey Y Timoshkin
- Institute of Chemistry, St. Petersburg State University, Universitetskaya emb. 7/9, 199034, St. Petersburg, Russia
| | - Ciprian I Raţ
- Department of Chemistry, Supramolecular Organic and Organometallic Chemistry Centre (SOOMCC), Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, Arany János Steet 11, 400028, Cluj-Napoca, Romania
| | - Jens Beckmann
- Institut für Anorganische Chemie und Kristallographie, Universität Bremen, Leobener Straße 7, 28359, Bremen, Germany
| |
Collapse
|
17
|
Hwu JR, Panja A, Gupta NK, Hu Y, Tan K, Lin C, Hwang K, Hsu M, Huang W, Tsay S. Domino Processes of Arynes Reacting with Three Classes of Nucleophiles for Organic Syntheses. European J Org Chem 2021. [DOI: 10.1002/ejoc.202001499] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Jih Ru Hwu
- Department of Chemistry and Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu 30013 Taiwan
| | - Avijit Panja
- Department of Chemistry and Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu 30013 Taiwan
| | - Nitesh K. Gupta
- Department of Chemistry and Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu 30013 Taiwan
| | - Yu‐Chen Hu
- Department of Chemical Engineering National Tsing Hua University Hsinchu 30013 Taiwan
| | - Kui‐Thong Tan
- Department of Chemistry and Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu 30013 Taiwan
| | - Chun‐Cheng Lin
- Department of Chemistry and Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu 30013 Taiwan
| | - Kuo‐Chu Hwang
- Department of Chemistry and Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu 30013 Taiwan
| | - Ming‐Hua Hsu
- Department of Chemistry National Changhua University of Education Changhua County 50007 Taiwan
| | - Wen‐Chieh Huang
- Department of Chemistry and Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu 30013 Taiwan
| | - Shwu‐Chen Tsay
- Department of Chemistry and Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu 30013 Taiwan
| |
Collapse
|
18
|
Geier SJ, Binder JF, Vogels CM, Watanabe LK, Macdonald CLB, Westcott SA. The hydroboration of α-diimines. NEW J CHEM 2021. [DOI: 10.1039/d1nj01025e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The uncatalyzed addition of catecholborane to α-diimines has been examined.
Collapse
Affiliation(s)
- Stephen J. Geier
- Department of Chemistry and Biochemistry, Mount Allison University, Sackville, NB E4L 1G8, Canada
| | - Justin F. Binder
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, ON N9B 3P4, Canada
| | - Christopher M. Vogels
- Department of Chemistry and Biochemistry, Mount Allison University, Sackville, NB E4L 1G8, Canada
| | - Lara K. Watanabe
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, ON N9B 3P4, Canada
| | - Charles L. B. Macdonald
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, ON N9B 3P4, Canada
- Department of Chemistry, Carleton University, Ottawa, ON, K1S 5B6, Canada
| | - Stephen A. Westcott
- Department of Chemistry and Biochemistry, Mount Allison University, Sackville, NB E4L 1G8, Canada
| |
Collapse
|
19
|
Maujean T, Chataigner I, Girard N, Gulea M, Bonnet D. Endocyclic Enamides Derived from Aza‐Diketopiperazines as Olefin Partners in Povarov Reaction: An Access to Tetracyclic N‐Heterocycles. European J Org Chem 2020. [DOI: 10.1002/ejoc.202001339] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Timothé Maujean
- CNRS Laboratoire d'Innovation Thérapeutique, LIT UMR 7200, LabEx Medalis, ITI InnoVec Université de Strasbourg 67000 Strasbourg France
| | - Isabelle Chataigner
- Normandie Université 76000 Rouen France
- CNRS, Laboratoire de Chimie Théorique, LCT UMR 7616 Sorbonne Université 75005 Paris France
| | - Nicolas Girard
- CNRS Laboratoire d'Innovation Thérapeutique, LIT UMR 7200, LabEx Medalis, ITI InnoVec Université de Strasbourg 67000 Strasbourg France
| | - Mihaela Gulea
- CNRS Laboratoire d'Innovation Thérapeutique, LIT UMR 7200, LabEx Medalis, ITI InnoVec Université de Strasbourg 67000 Strasbourg France
| | - Dominique Bonnet
- CNRS Laboratoire d'Innovation Thérapeutique, LIT UMR 7200, LabEx Medalis, ITI InnoVec Université de Strasbourg 67000 Strasbourg France
| |
Collapse
|
20
|
Ould DMC, Carden JL, Page R, Melen RL. Synthesis and Reactivity of Fluorinated Triaryl Aluminum Complexes. Inorg Chem 2020; 59:14891-14898. [PMID: 32869993 PMCID: PMC7581293 DOI: 10.1021/acs.inorgchem.0c01076] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
The addition of the Grignard 3,4,5-ArFMgBr to aluminum(III)
chloride in ether generates the novel triarylalane Al(3,4,5-ArF)3·OEt2. Attempts to synthesize
this alane via transmetalation from the parent borane with trimethylaluminum
gave a dimeric structure with bridging methyl groups, a product of
partial transmetalation. On the other hand, the novel alane Al(2,3,4-ArF)3 was synthesized from the parent borane and trimethylaluminum.
Interestingly, the solid-state structure of Al(2,3,4-ArF)3 shows an extended chain structure resulting from neighboring
Al···F contacts. Al(3,4,5-ArF)3·OEt2 was then found to be an effective catalyst
for the hydroboration of carbonyls, imines, and alkynes with pinacolborane. The addition of the Grignard 3,4,5-ArFMgBr to
aluminum(III) chloride in ether generates the novel triarylalane Al(3,4,5-ArF)3·OEt2. Attempts to synthesize
this alane via transmetalation from the parent borane with trimethylaluminum
gave a dimeric structure with bridging methyl groups; a product of
partial transmetalation. On the other hand, the novel alane Al(2,3,4-ArF)3 was synthesized from the parent borane and trimethylaluminum.
Al(3,4,5-ArF)3·OEt2 was then
found to be an effective catalyst for the hydroboration of carbonyls,
imines and alkynes with pinacolborane.
Collapse
Affiliation(s)
- Darren M C Ould
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Cardiff CF10 3AT, Cymru/Wales, U.K
| | - Jamie L Carden
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Cardiff CF10 3AT, Cymru/Wales, U.K
| | - Rowan Page
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Cardiff CF10 3AT, Cymru/Wales, U.K
| | - Rebecca L Melen
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Cardiff CF10 3AT, Cymru/Wales, U.K
| |
Collapse
|
21
|
Zhang Z, Huang S, Huang L, Xu X, Zhao H, Yan X. Synthesis of Mesoionic N-Heterocyclic Olefins and Catalytic Application for Hydroboration Reactions. J Org Chem 2020; 85:12036-12043. [DOI: 10.1021/acs.joc.0c00257] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Zengyu Zhang
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Shiqing Huang
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Linwei Huang
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Xingyu Xu
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Hongyan Zhao
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Xiaoyu Yan
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| |
Collapse
|
22
|
Altarejos J, Sucunza D, Vaquero JJ, Carreras J. Practical Solvent-Free Microwave-Assisted Hydroboration of Alkynes. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000110] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Julia Altarejos
- Departamento de Química Orgánica y Química Inorgánica; Instituto de Investigación Química “Andrés M. del Río” (IQAR); Universidad de Alcalá; IRYCIS; 28805 Madrid Alcalá de Henares Spain
| | - David Sucunza
- Departamento de Química Orgánica y Química Inorgánica; Instituto de Investigación Química “Andrés M. del Río” (IQAR); Universidad de Alcalá; IRYCIS; 28805 Madrid Alcalá de Henares Spain
| | - Juan J. Vaquero
- Departamento de Química Orgánica y Química Inorgánica; Instituto de Investigación Química “Andrés M. del Río” (IQAR); Universidad de Alcalá; IRYCIS; 28805 Madrid Alcalá de Henares Spain
| | - Javier Carreras
- Departamento de Química Orgánica y Química Inorgánica; Instituto de Investigación Química “Andrés M. del Río” (IQAR); Universidad de Alcalá; IRYCIS; 28805 Madrid Alcalá de Henares Spain
| |
Collapse
|
23
|
Avinash I, Parveen S, Anantharaman G. Backbone Boron-Functionalized Imidazoles/Imidazolium Salts: Synthesis, Structure, Metalation Studies, and Fluoride Sensing Properties. Inorg Chem 2020; 59:5646-5661. [DOI: 10.1021/acs.inorgchem.0c00348] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Iruthayaraj Avinash
- Department of Chemistry, Indian Institute of Technology, Kanpur, Uttar Pradesh 208016, India
| | - Sabeeha Parveen
- Department of Chemistry, Indian Institute of Technology, Kanpur, Uttar Pradesh 208016, India
| | - Ganapathi Anantharaman
- Department of Chemistry, Indian Institute of Technology, Kanpur, Uttar Pradesh 208016, India
| |
Collapse
|
24
|
Docherty JH, Nicholson K, Dominey AP, Thomas SP. A Boron–Boron Double Transborylation Strategy for the Synthesis of gem-Diborylalkanes. ACS Catal 2020. [DOI: 10.1021/acscatal.0c00869] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Jamie H. Docherty
- EaStCHEM School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh EH9 3FJ, United Kingdom
| | - Kieran Nicholson
- EaStCHEM School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh EH9 3FJ, United Kingdom
| | - Andrew P. Dominey
- GSK Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, United Kingdom
| | - Stephen P. Thomas
- EaStCHEM School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh EH9 3FJ, United Kingdom
| |
Collapse
|
25
|
Gioia B, Arnaud A, Radix S, Walchshofer N, Doléans-Jordheim A, Rocheblave L. Solvent- and metal-free hydroboration of alkynes under microwave irradiation. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.151596] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
|
26
|
Carden JL, Dasgupta A, Melen RL. Halogenated triarylboranes: synthesis, properties and applications in catalysis. Chem Soc Rev 2020; 49:1706-1725. [PMID: 32100762 DOI: 10.1039/c9cs00769e] [Citation(s) in RCA: 88] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Halogenated triarylboranes (BAr3) have been known for decades, however it has only been since the surge of interest in main group catalysis that their application as strong Lewis acid catalysts has been recognised. This review aims to look past the popular tris(pentafluorophenyl)borane [B(C6F5)3] to the other halogenated triarylboranes, to give a greater breadth of understanding as to how tuning the Lewis acidity of BAr3 by modifications of the aryl rings can lead to improved reactivity. In this review, a discussion on Lewis acidity determination of boranes is given, the synthesis of these boranes is discussed, and examples of how they are being used for catalysis and frustrated Lewis pair (FLP) chemistry are explained.
Collapse
Affiliation(s)
- Jamie L Carden
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, Cymru/Wales, UK.
| | | | | |
Collapse
|
27
|
Khononov M, Fridman N, Tamm M, Eisen MS. Hydroboration of Aldehydes, Ketones, and Carbodiimides Promoted by Mono(imidazolin‐2‐iminato) Hafnium Complexes. European J Org Chem 2020. [DOI: 10.1002/ejoc.201901750] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Maxim Khononov
- Schulich Faculty of Chemistry TechnionIsrael Institute of Technology 32000 Haifa City Israel
| | - Natalia Fridman
- Schulich Faculty of Chemistry TechnionIsrael Institute of Technology 32000 Haifa City Israel
| | - Matthias Tamm
- Institut fürAnorganische und Analytische Chemie Technische Universität Braunschweig Hagenring 30 38106 Braunschweig Germany
| | - Moris S. Eisen
- Schulich Faculty of Chemistry TechnionIsrael Institute of Technology 32000 Haifa City Israel
| |
Collapse
|
28
|
Kuciński K, Hreczycho G. Potassium Fluoride-Catalyzed Hydroboration of Aldehydes and Ketones: Facile Reduction to Primary and Secondary Alcohols. European J Org Chem 2020. [DOI: 10.1002/ejoc.201901514] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Krzysztof Kuciński
- Faculty of Chemistry; Adam Mickiewicz University in Poznań; Ul. Uniwersytetu Poznańskiego 8 61-614 Poznań Poland
| | - Grzegorz Hreczycho
- Faculty of Chemistry; Adam Mickiewicz University in Poznań; Ul. Uniwersytetu Poznańskiego 8 61-614 Poznań Poland
- Center for Advanced Technologies; Adam Mickiewicz University; Ul. Uniwersytetu Poznańskiego 10 61-614 Poznań Poland
| |
Collapse
|
29
|
Saptal VB, Wang R, Park S. Recent advances in transition metal-free catalytic hydroelementation (E = B, Si, Ge, and Sn) of alkynes. RSC Adv 2020; 10:43539-43565. [PMID: 35519696 PMCID: PMC9058465 DOI: 10.1039/d0ra07768b] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Accepted: 11/15/2020] [Indexed: 12/21/2022] Open
Abstract
This review describes the recent advances in the transition metal-free hydroelementation of alkynes with various metalloid hydrides.
Collapse
Affiliation(s)
- Vitthal B. Saptal
- Department of Chemistry
- Guangdong Technion Israel Institute of Technology
- China
| | - Ruibin Wang
- Department of Chemistry
- Guangdong Technion Israel Institute of Technology
- China
| | - Sehoon Park
- Department of Chemistry
- Guangdong Technion Israel Institute of Technology
- China
- Technion-Israel Institute of Technology
- 32000 Haifa
| |
Collapse
|
30
|
Baldassari LL, Santos KS, Ebersol CP, Lüdtke DS, Moro AV. Ligand-free, catalytic and regioselective hydroboration of selenoalkynes. Catal Sci Technol 2020. [DOI: 10.1039/d0cy01379j] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The copper-catalyzed hydroboration of selenoalkynes in a regio- and stereoselective fashion is reported, delivering selenium-containing vinylboronate products in good yields.
Collapse
Affiliation(s)
- Lucas L. Baldassari
- Institute of Chemistry
- Universidade Federal do Rio Grande do Sul
- Porto Alegre
- Brazil
| | - Kelvin S. Santos
- Institute of Chemistry
- Universidade Federal do Rio Grande do Sul
- Porto Alegre
- Brazil
| | - Camila P. Ebersol
- Institute of Chemistry
- Universidade Federal do Rio Grande do Sul
- Porto Alegre
- Brazil
| | - Diogo S. Lüdtke
- Institute of Chemistry
- Universidade Federal do Rio Grande do Sul
- Porto Alegre
- Brazil
| | - Angélica V. Moro
- Institute of Chemistry
- Universidade Federal do Rio Grande do Sul
- Porto Alegre
- Brazil
| |
Collapse
|
31
|
Nieto-Sepulveda E, Bage AD, Evans LA, Hunt TA, Leach AG, Thomas SP, Lloyd-Jones GC. Kinetics and Mechanism of the Arase-Hoshi R2BH-Catalyzed Alkyne Hydroboration: Alkenylboronate Generation via B–H/C–B Metathesis. J Am Chem Soc 2019; 141:18600-18611. [DOI: 10.1021/jacs.9b10114] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Eduardo Nieto-Sepulveda
- EaStChem, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom
| | - Andrew D. Bage
- EaStChem, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom
| | - Louise A. Evans
- EaStChem, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom
| | - Thomas A. Hunt
- Medicinal Chemistry, Oncology R&D, AstraZeneca, Cambridge, CB4 0WG, United Kingdom
| | - Andrew G. Leach
- School of Health Sciences, Stopford Building, The University of Manchester, Oxford Road, Manchester M13 9PT, United Kingdom
| | - Stephen P. Thomas
- EaStChem, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom
| | - Guy C. Lloyd-Jones
- EaStChem, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom
| |
Collapse
|
32
|
|
33
|
Gazis TA, Dasgupta A, Hill MS, Rawson JM, Wirth T, Melen RL. Reactions of hydrazones and hydrazides with Lewis acidic boranes. Dalton Trans 2019; 48:12391-12395. [PMID: 31397460 DOI: 10.1039/c9dt01359h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The reaction of (diphenylmethylene)hydrazone or 1,4-bis-hydrazone-ylidene(phenylmethyl)benzene with Lewis acidic boranes B(2,4,6-F3C6H2)3 or B(3,4,5-F3C6H2)3 generates the Lewis acid-base adducts. Alternatively, when (9H-fluoren-9-ylidene)hydrazone is employed several products were isolated including 1,2-di(9H-fluoren-9-ylidene)hydrazone, the 2 : 1 borane adduct of NH2-NH2 and the 1-(diarylboraneyl)-2-(9H-fluoren-9-ylidene)hydrazone in which one ArH group has been eliminated. The benzhydrazide starting material also initially gives an adduct when reacted with Lewis acidic boranes which upon heating eliminates ArH generating a CON2B heterocycle.
Collapse
Affiliation(s)
- Theodore A Gazis
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, Cymru/Wales CF10 3AT, UK.
| | - Ayan Dasgupta
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, Cymru/Wales CF10 3AT, UK.
| | - Michael S Hill
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK
| | - Jeremy M Rawson
- Department of Chemistry and Biochemistry, University of Windsor, 401 Sunset Avenue, Windsor, Ontario N9B 3P4, Canada
| | - Thomas Wirth
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, Cymru/Wales CF10 3AT, UK
| | - Rebecca L Melen
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, Cymru/Wales CF10 3AT, UK.
| |
Collapse
|
34
|
Seo Y, Lowe JM, Gagné MR. Controlling Sugar Deoxygenation Products from Biomass by Choice of Fluoroarylborane Catalyst. ACS Catal 2019. [DOI: 10.1021/acscatal.9b01578] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Youngran Seo
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Jared M. Lowe
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Michel R. Gagné
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| |
Collapse
|
35
|
Procter RJ, Uzelac M, Cid J, Rushworth PJ, Ingleson MJ. Low-Coordinate NHC–Zinc Hydride Complexes Catalyze Alkyne C–H Borylation and Hydroboration Using Pinacolborane. ACS Catal 2019. [DOI: 10.1021/acscatal.9b01370] [Citation(s) in RCA: 69] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
| | - Marina Uzelac
- School of Chemistry, University of Edinburgh, Edinburgh EH9 3FJ, U.K
| | - Jessica Cid
- School of Chemistry, University of Manchester, Manchester M13 9PL, U.K
| | - Philip J. Rushworth
- Research and Development, GlaxoSmithKline, Gunnels Wood Road, Stevenage SG1 2NY, U.K
| | | |
Collapse
|
36
|
Bisai MK, Yadav S, Das T, Vanka K, Sen SS. Lithium compounds as single site catalysts for hydroboration of alkenes and alkynes. Chem Commun (Camb) 2019; 55:11711-11714. [DOI: 10.1039/c9cc05783h] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Readily accessible lithium compounds have been employed to catalyze the hydroboration of alkene and alkynes including terpenes using HBpin with anti-Markovnikov selectivity. The mechanism is proposed on the basis of experimental and DFT studies.
Collapse
Affiliation(s)
- Milan Kumar Bisai
- Inorganic Chemistry and Catalysis Division
- CSIR-National Chemical Laboratory
- Pune 411008
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - Sandeep Yadav
- Inorganic Chemistry and Catalysis Division
- CSIR-National Chemical Laboratory
- Pune 411008
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - Tamal Das
- Academy of Scientific and Innovative Research (AcSIR)
- Ghaziabad-201002
- India
- Physical and Material Chemistry Division
- CSIR-National Chemical Laboratory
| | - Kumar Vanka
- Academy of Scientific and Innovative Research (AcSIR)
- Ghaziabad-201002
- India
- Physical and Material Chemistry Division
- CSIR-National Chemical Laboratory
| | - Sakya S. Sen
- Inorganic Chemistry and Catalysis Division
- CSIR-National Chemical Laboratory
- Pune 411008
- India
- Academy of Scientific and Innovative Research (AcSIR)
| |
Collapse
|
37
|
Shegavi ML, Bose SK. Recent advances in the catalytic hydroboration of carbonyl compounds. Catal Sci Technol 2019. [DOI: 10.1039/c9cy00807a] [Citation(s) in RCA: 112] [Impact Index Per Article: 22.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The latest development in the catalytic hydroboration of CO groups is summarized in this review. Access to borate ester intermediates provides a pathway to convert them into the corresponding valuable functionalized alcohols.
Collapse
Affiliation(s)
- Mahadev L. Shegavi
- Centre for Nano and Material Sciences (CNMS)
- JAIN (Deemed-to-be University)
- Jain Global Campus
- Bangalore-562112
- India
| | - Shubhankar Kumar Bose
- Centre for Nano and Material Sciences (CNMS)
- JAIN (Deemed-to-be University)
- Jain Global Campus
- Bangalore-562112
- India
| |
Collapse
|