1
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Bisht SK, Sharma D, Kannan R, Rajeshkumar T, Maron L, Venugopal A. Quest for Active Species in Al/B-Catalyzed CO 2 Hydrosilylation. Inorg Chem 2023; 62:18543-18552. [PMID: 37906233 DOI: 10.1021/acs.inorgchem.3c02771] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2023]
Abstract
We demonstrate the catalytic role of aluminum and boron centers in aluminum borohydride [(2-Me2CH2C6H4)(C6H5)Al(μ-H)2B(C6H5)2] (6) during carbon dioxide (CO2) hydrosilylation. Preliminary investigations into CO2 reduction using [(2-Me2NCH2C6H4)(H)Al(μ-H)]2 (1) and [Ph3C][B(3,5-C6H3Cl2)4] (2) in the presence of Et3SiH and PhSiH3 resulted in CH2(OSiR3)2 and CH3OSiR3, which serve as formaldehyde and methanol surrogates, respectively. In pursuit of identifying the active catalytic species, three compounds, B(3,5-C6H3Cl2)3 (3), [(2-Me2NCH2C6H4)(3,5-C6H3Cl2)Al(μ-H)2B(3,5-C6H3Cl2)2] (4), and [(2-Me2NCH2C6H4)2Al(THF)][B(3,5-C6H3Cl2)4] (5), were isolated. Among compounds 2-5, the highest catalytic conversion was achieved by 4. Further, 4 and 6 were prepared in a straightforward method by treating 1 with 3 and BPh3, respectively. 6 was found to be in equilibrium with 1 and BPh3, thus making the catalytic process of 6 more efficient than that of 4. Computational investigations inferred that CO2 reduction occurs across the Al-H bond, while Si-H activation occurs through a concerted mechanism involving an in situ generated aluminum formate species and BPh3.
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Affiliation(s)
- Sheetal Kathayat Bisht
- School of Chemistry, Indian Institute of Science Education and Research (IISER) Thiruvananthapuram, Vithura, Thiruvananthapuram 695551, India
| | - Deepti Sharma
- School of Chemistry, Indian Institute of Science Education and Research (IISER) Thiruvananthapuram, Vithura, Thiruvananthapuram 695551, India
| | - Ramkumar Kannan
- School of Chemistry, Indian Institute of Science Education and Research (IISER) Thiruvananthapuram, Vithura, Thiruvananthapuram 695551, India
| | - Thayalan Rajeshkumar
- Laboratoire de Physique et Chimie des Nano-objets, Institut National des Sciences Appliquées, Toulouse, Cedex 4 31077, France
| | - Laurent Maron
- Laboratoire de Physique et Chimie des Nano-objets, Institut National des Sciences Appliquées, Toulouse, Cedex 4 31077, France
| | - Ajay Venugopal
- School of Chemistry, Indian Institute of Science Education and Research (IISER) Thiruvananthapuram, Vithura, Thiruvananthapuram 695551, India
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2
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Moon HW, Lavagnino MN, Lim S, Palkowitz MD, Mandler MD, Beutner GL, Drance MJ, Lipshultz JM, Scola PM, Radosevich AT. Deoxyfluorination of 1°, 2°, and 3° Alcohols by Nonbasic O-H Activation and Lewis Acid-Catalyzed Fluoride Shuttling. J Am Chem Soc 2023; 145:22735-22744. [PMID: 37812176 PMCID: PMC11179691 DOI: 10.1021/jacs.3c08373] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/10/2023]
Abstract
A method for deoxyfluorination of aliphatic primary, secondary, and tertiary alcohols is reported, employing a nontrigonal phosphorus triamide for base-free alcohol activation in conjunction with an organic soluble fluoride donor and a triarylborane fluoride shuttling catalyst. Mechanistic experiments are consistent with a reaction that proceeds by the collapse of an oxyphosphonium fluoroborate ion pair with fluoride transfer. The substrate scope complements existing deoxyfluorination methods and enables the preparation of homochiral secondary and tertiary alkylfluorides by stereoinversion of the substrate alcohol.
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Affiliation(s)
- Hye Won Moon
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Marissa N. Lavagnino
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Soohyun Lim
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Maximilian D. Palkowitz
- Small Molecule Drug Discovery, Bristol Myers Squibb, 250 Water Street, Cambridge, Massachusetts 02141, United States
| | - Michael D. Mandler
- Small Molecule Drug Discovery, Bristol Myers Squibb, Princeton, New Jersey 08543, United States
| | - Gregory L. Beutner
- Chemical and Synthetic Development, Bristol Myers Squibb, One Squibb Drive, New Brunswick, New Jersey 08903, United States
| | - Myles J. Drance
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Jeffrey M. Lipshultz
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Paul M. Scola
- Small Molecule Drug Discovery, Bristol Myers Squibb, 250 Water Street, Cambridge, Massachusetts 02141, United States
| | - Alexander T. Radosevich
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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3
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Stefkova K, Guerzoni MG, van Ingen Y, Richards E, Melen RL. B(C 6F 5) 3-Catalyzed Diastereoselective and Divergent Reactions of Vinyldiazo Esters with Nitrones: Synthesis of Highly Functionalized Diazo Compounds. Org Lett 2023; 25:500-505. [PMID: 36634071 PMCID: PMC9887602 DOI: 10.1021/acs.orglett.2c04198] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Indexed: 01/13/2023]
Abstract
Herein we report a mild, transition-metal-free, highly diastereoselective Lewis acid catalyzed methodology toward the synthesis of isoxazolidine-based diazo compounds from the reaction between vinyldiazo esters and nitrones. Interestingly, the isoxazolidine products were identified to have contrasting diastereoselectivity to previously reported metal-catalyzed reactions. Furthermore, the same catalyst can be used with enol diazo esters, prompting the formation of Mukaiyama-Mannich products. These diazo products can then be further functionalized to afford benzo[b]azepine and pyrrolidinone derivatives.
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Affiliation(s)
| | | | - Yara van Ingen
- Cardiff Catalysis Institute, School
of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, Cymru/Wales, United Kingdom
| | - Emma Richards
- Cardiff Catalysis Institute, School
of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, Cymru/Wales, United Kingdom
| | - Rebecca L. Melen
- Cardiff Catalysis Institute, School
of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, Cymru/Wales, United Kingdom
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4
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He T, Edwards TC, Majima R, Jung E, Kankanala J, Xie J, Geraghty RJ, Wang Z. Repurposing N-hydroxy thienopyrimidine-2,4-diones (HtPD) as inhibitors of human cytomegalovirus pUL89 endonuclease: Synthesis and biological characterization. Bioorg Chem 2022; 129:106198. [PMID: 36265353 PMCID: PMC9643671 DOI: 10.1016/j.bioorg.2022.106198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 10/03/2022] [Accepted: 10/05/2022] [Indexed: 11/02/2022]
Abstract
The terminase complex of human cytomegalovirus (HCMV) is required for viral genome packaging and cleavage. Critical to the terminase functions is a metal-dependent endonuclease at the C-terminus of pUL89 (pUL89-C). We have previously reported metal-chelating N-hydroxy thienopyrimidine-2,4-diones (HtPD) as inhibitors of human immunodeficiency virus 1 (HIV-1) RNase H. In the current work, we have synthesized new analogs and resynthesized known analogs of two isomeric HtPD subtypes, anti-HtPD (13), and syn-HtPD (14), and characterized them as inhibitors of pUL89-C. Remarkably, the vast majority of analogs strongly inhibited pUL89-C in the biochemical endonuclease assay, with IC50 values in the nM range. In the cell-based antiviral assay, a few analogs inhibited HCMV in low μM concentrations. Selected analogs were further characterized in a biophysical thermal shift assay (TSA) and in silico molecular docking, and the results support pUL89-C as the protein target of these inhibitors. Collectively, the biochemical, antiviral, biophysical, and in silico data reported herein indicate that the isomeric HtPD chemotypes 13-14 can serve as valuable chemical platforms for designing improved inhibitors of HCMV pUL89-C.
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Affiliation(s)
- Tianyu He
- Center for Drug Design, College of Pharmacy, University of Minnesota, Minneapolis, MN 55455, USA
| | - Tiffany C Edwards
- Center for Drug Design, College of Pharmacy, University of Minnesota, Minneapolis, MN 55455, USA
| | - Ryuichi Majima
- Center for Drug Design, College of Pharmacy, University of Minnesota, Minneapolis, MN 55455, USA
| | - Eunkyung Jung
- Center for Drug Design, College of Pharmacy, University of Minnesota, Minneapolis, MN 55455, USA
| | - Jayakanth Kankanala
- Center for Drug Design, College of Pharmacy, University of Minnesota, Minneapolis, MN 55455, USA
| | - Jiashu Xie
- Center for Drug Design, College of Pharmacy, University of Minnesota, Minneapolis, MN 55455, USA
| | - Robert J Geraghty
- Center for Drug Design, College of Pharmacy, University of Minnesota, Minneapolis, MN 55455, USA
| | - Zhengqiang Wang
- Center for Drug Design, College of Pharmacy, University of Minnesota, Minneapolis, MN 55455, USA.
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5
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Wang B, Zhang GM, Zhang H, Wang JY. B(C 6F 5) 3-catalyzed oxidation of α-diazoesters using DMF and molecular oxygen as oxygen sources. RSC Adv 2022; 12:33584-33588. [PMID: 36505720 PMCID: PMC9682326 DOI: 10.1039/d2ra05739e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Accepted: 11/09/2022] [Indexed: 11/24/2022] Open
Abstract
A metal-free catalytic oxidation of α-diazoesters via a green environmental-friendly route was developed. The α-diazoesters were converted to α-ketoesters using DMF and molecular oxygen as oxygen sources and B(C6F5)3 as the catalyst, without any additives. This protocol has a broad adaptability of substrates and good compatibility with a range of functional groups, and it offers new insight into reactions catalyzed by B(C6F5)3.
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Affiliation(s)
- Bei Wang
- Department of Chemistry, Asymmetric Synthesis and Chiral Technology Key Laboratory of Sichuan Province, Xihua UniversityChengdu 610041P. R. China,Chengdu Institute of Organic Chemistry, Chinese Academy of SciencesChengdu 610041P. R. China,University of Chinese Academy of SciencesBeijing 100049P. R. China
| | - Guo-Min Zhang
- Department of Chemistry, Asymmetric Synthesis and Chiral Technology Key Laboratory of Sichuan Province, Xihua UniversityChengdu 610041P. R. China,Chengdu Institute of Organic Chemistry, Chinese Academy of SciencesChengdu 610041P. R. China,University of Chinese Academy of SciencesBeijing 100049P. R. China
| | - Hua Zhang
- Department of Chemistry, Asymmetric Synthesis and Chiral Technology Key Laboratory of Sichuan Province, Xihua UniversityChengdu 610041P. R. China,Chengdu Institute of Organic Chemistry, Chinese Academy of SciencesChengdu 610041P. R. China,University of Chinese Academy of SciencesBeijing 100049P. R. China
| | - Ji-Yu Wang
- Department of Chemistry, Asymmetric Synthesis and Chiral Technology Key Laboratory of Sichuan Province, Xihua UniversityChengdu 610041P. R. China,Chengdu Institute of Organic Chemistry, Chinese Academy of SciencesChengdu 610041P. R. China
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6
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Mandal D, Chen T, Qu Z, Grimme S, Stephan DW. Reactions of Frustrated Lewis Pairs with Chloro‐Diazirines: Cleavage of N=N Double Bonds. Angew Chem Int Ed Engl 2022; 61:e202209241. [PMID: 35830598 PMCID: PMC9543150 DOI: 10.1002/anie.202209241] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Indexed: 01/19/2023]
Abstract
The reactions of FLPs with diazomethanes leads to the rapid loss of N2. In contrast, in this work, we reported reactions of phosphine/borane FLPs with chlorodiazirines which led to the reduction of the N=N double bond, affording linked phosphinimide/amidoborate zwitterions of the general form R3PNC(Ar)NR′BX(C6F5)2. A detailed DFT mechanistic study showed that these reactions proceed via FLP addition to the N=N bond, followed by subsequent group transfer reactions to nitrogen and capture of the halide anion.
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Affiliation(s)
- Dipendu Mandal
- Institute of Drug Discovery Technology Ningbo University Ningbo 315211, Zhejiang China
| | - Ting Chen
- Institute of Drug Discovery Technology Ningbo University Ningbo 315211, Zhejiang China
| | - Zheng‐Wang Qu
- Mulliken Center for Theoretical Chemistry, Clausius Institut für Physikalische und Theoretische Chemie Rheinische Friedrich-Wilhelms-Universität Bonn Beringstrasse 4 53115 Bonn Germany
| | - Stefan Grimme
- Mulliken Center for Theoretical Chemistry, Clausius Institut für Physikalische und Theoretische Chemie Rheinische Friedrich-Wilhelms-Universität Bonn Beringstrasse 4 53115 Bonn Germany
| | - Douglas W. Stephan
- Institute of Drug Discovery Technology Ningbo University Ningbo 315211, Zhejiang China
- Department of Chemistry University of Toronto 80 St. George St Toronto ON M5S3H6 Canada
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7
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Mandal D, Chen T, Qu ZW, Grimme S, Stephan DW. <p class="Title1">Reactions of Frustrated Lewis Pairs with Chloro‐Diazirines: Cleavage of N=N Double Bonds<o:p></o:p></p>. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202209241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Dipendu Mandal
- University of Toronto - St George Campus: University of Toronto Chemistry CANADA
| | | | - Zheng-Wang Qu
- University of Bonn: Rheinische Friedrich-Wilhelms-Universitat Bonn Theoretical chemistry GERMANY
| | - Stefan Grimme
- University of Bonn: Rheinische Friedrich-Wilhelms-Universitat Bonn Theoretical chemistry GERMANY
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8
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Kaehler T, Lorenz J, Ould DMC, Engl D, Santi M, Gierlichs L, Wirth T, Melen RL. Borane promoted aryl transfer reaction for the synthesis of α-aryl functionalised β-hydroxy and β-keto esters. Org Biomol Chem 2022; 20:4298-4302. [PMID: 35575126 DOI: 10.1039/d2ob00643j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of a series of α-aryl or α-alkyl functionalised β-hydroxy and β-keto esters has been achieved by reacting α-diazoesters with boranes, and aldehydes, ketones, anhydrides, nitriles, esters or isocyanates. In a mild reaction protocol, 26 examples are presented in yields up to 73%.
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Affiliation(s)
- Tanja Kaehler
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, Cymru/Wales, UK.
| | - Jonas Lorenz
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, Cymru/Wales, UK.
| | - Darren M C Ould
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, Cymru/Wales, UK.
| | - Dorothea Engl
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, Cymru/Wales, UK.
| | - Micol Santi
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, Cymru/Wales, UK.
| | - Lukas Gierlichs
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, Cymru/Wales, UK.
| | - Thomas Wirth
- 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.
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9
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Esarte Palomero O, Jones RA. Ferrocene tethered boramidinate frustrated Lewis pairs: stepwise capture of CO 2 and CO. Dalton Trans 2022; 51:6275-6284. [PMID: 35379999 DOI: 10.1039/d2dt00691j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis and reactivity of novel ferrocene tethered boramidinate frustrated Lewis pairs (FLPs), capable of the sequential capture of small molecules, is reported. Reactions of 1,1'-dicarbodiimidoferrocenes with different boranes provides access to metallocene tethered FLPs. The reactivity of the boramidinate moieties can be tuned by the nature of the carbodiimido substituents (alkyl vs. aryl) and the borane used in the reduction (9-borabicyclo[3.3.1]nonane [(C8H14)2BH]2vs. bis-pentafluorophenyl borane [(C6F5)2BH]2). The boramidinate FLP arms do not engage in intramolecular reactions, allowing for independent small molecule capture by each FLP. By careful synthetic control, sequential capture of different gaseous small molecules (CO2 and CO or CO2 and CNtBu) by the same bis(boramidinate)ferrocene molecule has been demonstrated.
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Affiliation(s)
- Orhi Esarte Palomero
- Department of Chemistry - The University of Texas at Austin, 105 E 24th St., Austin, TX 78712, USA.
| | - Richard A Jones
- Department of Chemistry - The University of Texas at Austin, 105 E 24th St., Austin, TX 78712, USA.
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10
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Sakharov P, Novikov MS, Nguyen TK, Kinzhalov MA, Khlebnikov AF, Rostovskii NV. Blue Light-Promoted Cross-Coupling of α-Diazo Esters with Isocyanides: Synthesis of Ester-Functionalized Ketenimines. ACS OMEGA 2022; 7:9071-9079. [PMID: 35309460 PMCID: PMC8928522 DOI: 10.1021/acsomega.2c00367] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Accepted: 02/23/2022] [Indexed: 05/09/2023]
Abstract
A metal-free scalable synthesis of functionalized ketenimines from alkyl α-(aryl/heteroaryl)-α-diazoacetates and alkyl isocyanides induced by blue light irradiation has been developed. The reaction proceeds at room temperature without any photocatalyst and provides ketenimines in moderate to good yields. Density functional theory (DFT) calculations and the experimental study showed that aryl(alkoxycarbonyl)carbenes in both singlet and triplet states can react with isocyanides but only the reaction of the former leads to the smooth formation of ketenimines. The obtained ketenimines were used for the synthesis of functionalized amidines under mild metal-free conditions.
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11
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Dasgupta A, Richards E, Melen RL. Triarylborane Catalyzed Carbene Transfer Reactions Using Diazo Precursors. ACS Catal 2022; 12:442-452. [PMID: 35028191 PMCID: PMC8749965 DOI: 10.1021/acscatal.1c04746] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Revised: 11/30/2021] [Indexed: 12/21/2022]
Abstract
Reactive carbenes generated from diazo compounds are key intermediates for a range of organic reactions to afford synthetically useful organic compounds. The majority of these reactions have been carried out using transition metal catalysts. However, the formation of carbene intermediates using main group elements has not been widely investigated for synthetic purposes. Recent studies have demonstrated that triarylboranes can be used for the in situ generation of reactive carbene intermediates in both stoichiometric and catalytic reactions. These new reactivities of triarylboranes have gained significant attention in synthetic chemistry particularly in catalytic studies. The range of organic compounds that have been synthesized through these reactions are important as pharmaceuticals or agrochemicals. In this perspective, we highlight the recent progress and ongoing challenges of carbene transfer reactions generated from their corresponding diazo precursors using triarylboranes as catalysts. We also highlight the stoichiometric use of triarylboranes in which the boranes not only activate the diazo functionality to afford a carbene intermediate but also actively participate in the reactions as a reagent. The different mechanisms for activation and carbene transfer are described along with the mechanistic and computational studies that have aided the elucidation of these reaction pathways. Potential opportunities for the use of boranes as a catalyst toward different carbene transfer reactions and their future prospects are discussed.
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Affiliation(s)
- Ayan Dasgupta
- Cardiff Catalysis Institute,
School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, Cymru/Wales, United Kingdom
| | - Emma Richards
- Cardiff Catalysis Institute,
School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, Cymru/Wales, United Kingdom
| | - Rebecca L. Melen
- Cardiff Catalysis Institute,
School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, Cymru/Wales, United Kingdom
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12
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Qin H, Xie Q, He L. Diastereoselective synthesis of chroman bearing spirobenzofuranone scaffolds via oxa-Michael/1,6-conjugated addition of para-quinone methides with benzofuranone-type olefins. RSC Adv 2022; 12:16684-16687. [PMID: 35754894 PMCID: PMC9169491 DOI: 10.1039/d2ra03031d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Accepted: 05/29/2022] [Indexed: 12/17/2022] Open
Abstract
A simple and convenient cyclization of ortho-hydroxyphenyl-substituted para-quinone methides with benzofuran-2-one type active olefins via oxa-Michael/1,6-conjugated addition has been developed, which afforded an easy access to enriched functionalized chroman-spirobenzofuran-2-one scaffolds with good to excellent yields (up to 90%) and diastereoselectivities (up to >19 : 1 dr). This reaction provided an efficient method for constructing desired spirocyclic compounds combining both well-known heterocyclic pharmacophores chroman and benzofuran-2-one. Highly diastereoselective synthesis of spirocyclic compounds combining both well-known heterocyclic pharmacophores chroman and benzofuran-2-one.![]()
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Affiliation(s)
- Hongmei Qin
- College of Chemistry and Materials Engineering, Guiyang University, Guiyang, 550005, P. R. China
| | - Qimei Xie
- College of Chemistry and Chemical Engineering, China West Normal University, Nanchong, 637002, P. R. China
| | - Long He
- College of Chemistry and Materials Engineering, Guiyang University, Guiyang, 550005, P. R. China
- College of Chemistry and Chemical Engineering, China West Normal University, Nanchong, 637002, P. R. China
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13
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Babaahmadi R, Dasgupta A, Hyland CJT, Yates BF, Melen R, Ariafard A. Understanding the Influence of Donor-Acceptor Diazo Compounds on the Catalyst Efficiency of B(C6F5)3 Towards Carbene Formation. Chemistry 2021; 28:e202104376. [PMID: 34958698 PMCID: PMC9303686 DOI: 10.1002/chem.202104376] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Indexed: 11/25/2022]
Abstract
Diazo compounds have been largely used as carbene precursors for carbene transfer reactions in a variety of functionalization reactions. However, the ease of carbene generation from the corresponding diazo compounds depends upon the electron donating/withdrawing substituents either side of the diazo functionality. These groups strongly impact the ease of N2 release. Recently, tris(pentafluorophenyl)borane [B(C6F5)3] has been shown to be an alternative transition metal‐free catalyst for carbene transfer reactions. Herein, a density functional theory (DFT) study on the generation of carbene species from α‐aryl α‐diazocarbonyl compounds using catalytic amounts of B(C6F5)3 is reported. The significant finding is that the efficiency of the catalyst depends directly on the nature of the substituents on both the aryl ring and the carbonyl group of the substrate. In some cases, the boron catalyst has negligible effect on the ease of the carbene formation, while in other cases there is a dramatic reduction in the activation energy of the reaction. This direct dependence is not commonly observed in catalysis and this finding opens the way for intelligent design of this and other similar catalytic reactions.
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Affiliation(s)
| | - Ayan Dasgupta
- Cardiff University, School of chemistry, Cardiff University, 57 Park Place, Cardiff, CF10 3AT, Cardiff, UNITED KINGDOM
| | | | - Brian F Yates
- University of Tasmania, Faculty of Education, AUSTRALIA
| | - Rebecca Melen
- Cardiff University, Chemistry, Main Building, Park Place, CF10 3AT, Cardiff, UNITED KINGDOM
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14
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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.
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15
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Dasgupta A, Pahar S, Babaahmadi R, Gierlichs L, Yates BF, Ariafard A, Melen RL. Borane Catalyzed Selective Diazo Cross‐Coupling Towards Pyrazoles. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202101312] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Ayan Dasgupta
- Cardiff Catalysis Institute, School of Chemistry Cardiff University Main Building, Park Place Cardiff CF10 3AT Cymru/Wales United Kingdom
| | - Sanjukta Pahar
- Cardiff Catalysis Institute, School of Chemistry Cardiff University Main Building, Park Place Cardiff CF10 3AT Cymru/Wales United Kingdom
| | - Rasool Babaahmadi
- School of Natural Sciences (Chemistry) University of Tasmania Private Bag 75 Hobart Tasmania 7001 Australia
| | - Lukas Gierlichs
- Cardiff Catalysis Institute, School of Chemistry Cardiff University Main Building, Park Place Cardiff CF10 3AT Cymru/Wales United Kingdom
| | - Brian F. Yates
- School of Natural Sciences (Chemistry) University of Tasmania Private Bag 75 Hobart Tasmania 7001 Australia
| | - Alireza Ariafard
- School of Natural Sciences (Chemistry) University of Tasmania Private Bag 75 Hobart Tasmania 7001 Australia
| | - Rebecca L. Melen
- Cardiff Catalysis Institute, School of Chemistry Cardiff University Main Building, Park Place Cardiff CF10 3AT Cymru/Wales United Kingdom
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16
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Dasgupta A, Babaahmadi R, Pahar S, Stefkova K, Gierlichs L, Yates BF, Ariafard A, Melen RL. Tris(pentafluorphenyl)boran‐katalysierte Erzeugung von Carbenium‐Ionen und autokatalytische Pyrazol‐Synthese – eine theoretische und experimentelle Studie. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202109744] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Ayan Dasgupta
- Cardiff Catalysis Institute School of Chemistry Cardiff University Main Building, Park Place Cardiff CF10 3AT Cymru/Wales Großbritannien
| | - Rasool Babaahmadi
- School of Physical Sciences University of Tasmania Private Bag 75 Hobart Tasmania 7001 Australien
| | - Sanjukta Pahar
- Cardiff Catalysis Institute School of Chemistry Cardiff University Main Building, Park Place Cardiff CF10 3AT Cymru/Wales Großbritannien
| | - Katarina Stefkova
- Cardiff Catalysis Institute School of Chemistry Cardiff University Main Building, Park Place Cardiff CF10 3AT Cymru/Wales Großbritannien
| | - Lukas Gierlichs
- Cardiff Catalysis Institute School of Chemistry Cardiff University Main Building, Park Place Cardiff CF10 3AT Cymru/Wales Großbritannien
| | - Brian F. Yates
- School of Physical Sciences University of Tasmania Private Bag 75 Hobart Tasmania 7001 Australien
| | - Alireza Ariafard
- School of Physical Sciences University of Tasmania Private Bag 75 Hobart Tasmania 7001 Australien
| | - Rebecca L. Melen
- Cardiff Catalysis Institute School of Chemistry Cardiff University Main Building, Park Place Cardiff CF10 3AT Cymru/Wales Großbritannien
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17
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Dasgupta A, Babaahmadi R, Pahar S, Stefkova K, Gierlichs L, Yates BF, Ariafard A, Melen RL. Tris(pentafluorophenyl)borane-Catalyzed Carbenium Ion Generation and Autocatalytic Pyrazole Synthesis-A Computational and Experimental Study. Angew Chem Int Ed Engl 2021; 60:24395-24399. [PMID: 34590773 PMCID: PMC8596400 DOI: 10.1002/anie.202109744] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 09/16/2021] [Indexed: 12/11/2022]
Abstract
In recent years, metal-free organic synthesis using triarylboranes as catalysts has become a prevalent research area. Herein we report a comprehensive computational and experimental study for the highly selective synthesis of N-substituted pyrazoles through the generation of carbenium species from the reaction between aryl esters and vinyl diazoacetates in the presence of catalytic tris(pentafluorophenyl)borane [B(C6 F5 )3 ]. DFT studies were undertaken to illuminate the reaction mechanism revealing that the in situ generation of a carbenium species acts as an autocatalyst to prompt the regiospecific formation of N-substituted pyrazoles in good to excellent yields (up to 81 %).
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Affiliation(s)
- Ayan Dasgupta
- Cardiff Catalysis InstituteSchool of ChemistryCardiff UniversityMain Building, Park PlaceCardiffCF10 3ATCymru/WalesUnited Kingdom
| | - Rasool Babaahmadi
- School of Physical SciencesUniversity of TasmaniaPrivate Bag 75HobartTasmania7001Australia
| | - Sanjukta Pahar
- Cardiff Catalysis InstituteSchool of ChemistryCardiff UniversityMain Building, Park PlaceCardiffCF10 3ATCymru/WalesUnited Kingdom
| | - Katarina Stefkova
- Cardiff Catalysis InstituteSchool of ChemistryCardiff UniversityMain Building, Park PlaceCardiffCF10 3ATCymru/WalesUnited Kingdom
| | - Lukas Gierlichs
- Cardiff Catalysis InstituteSchool of ChemistryCardiff UniversityMain Building, Park PlaceCardiffCF10 3ATCymru/WalesUnited Kingdom
| | - Brian F. Yates
- School of Physical SciencesUniversity of TasmaniaPrivate Bag 75HobartTasmania7001Australia
| | - Alireza Ariafard
- School of Physical SciencesUniversity of TasmaniaPrivate Bag 75HobartTasmania7001Australia
| | - Rebecca L. Melen
- Cardiff Catalysis InstituteSchool of ChemistryCardiff UniversityMain Building, Park PlaceCardiffCF10 3ATCymru/WalesUnited Kingdom
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18
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Zhang ZH, Wang X, Wang XJ, Li Y, Hong M. Tris(2,4-difluorophenyl)borane/Triisobutylphosphine Lewis Pair: A Thermostable and Air/Moisture-Tolerant Organic Catalyst for the Living Polymerization of Acrylates. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c01356] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Zhen-Hua Zhang
- Tianjin Key Lab of Composite & Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai 200032, China
| | - Xing Wang
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai 200032, China
| | - Xiao-Jun Wang
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai 200032, China
| | - Yuesheng Li
- Tianjin Key Lab of Composite & Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China
| | - Miao Hong
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai 200032, China
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19
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Abstract
Herein, we report on the tris(pentafluorophenyl)borane-catalyzed reaction of carbazole heterocycles with aryldiazoacetates. We could demonstrate that selective N-H functionalization occurs in the case of an unprotected carbazole, other N-heterocycles, and secondary amines in good yields. In contract, the protected carbazole undergoes C-H functionalization at the C-3 position in a good yield. The application of both approaches was studied in 41 examples with up to a 97% yield.
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Affiliation(s)
- Feifei He
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, D-52074 Aachen, Germany
| | - Rene M Koenigs
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, D-52074 Aachen, Germany
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20
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Xin HL, Rao X, Ishitani H, Kobayashi S. Sequential Continuous-Flow Synthesis of 3-Aryl Benzofuranones. Chem Asian J 2021; 16:1906-1910. [PMID: 34137489 DOI: 10.1002/asia.202100461] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Revised: 05/27/2021] [Indexed: 01/01/2023]
Abstract
A sequential continuous-flow system to produce 3-aryl benzofuranones was developed. Starting from 2,4-di-tert-butylphenol and glyoxylic acid monohydrate, both the initial cyclocondensation and the subsequent Friedel-Crafts alkylation were catalyzed by the same heterogeneous catalyst, Amberlyst-15H. The catalyst has a promising life-time for these two steps, and it was able to be recovered and reused for several runs without deactivation. By using the established flow system, 5,7-di-tert-butyl-3-(3,4-dimethylphenyl)-3H-benzofuran-2-one (Irganox HP-136), which is a commercial antioxidant, was prepared in 88% two-step yield. Reactions with various aromatic compounds proceeded well under flow conditions to afford 3-aryl benzo-furanone derivatives in high yields with good functional group compatibility.
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Affiliation(s)
- Hai-Long Xin
- Department of Chemistry, School of Science, The University of Tokyo, Hongo, 113-0033, Bunkyo-ku, Tokyo, Japan
| | - Xiaofeng Rao
- Department of Chemistry, School of Science, The University of Tokyo, Hongo, 113-0033, Bunkyo-ku, Tokyo, Japan
| | - Haruro Ishitani
- Green & Sustainable Chemistry Social Cooperation Laboratory, Graduate School of Science, The University of Tokyo, Hongo, 113-0033, Bunkyo-ku, Tokyo, Japan
| | - Shū Kobayashi
- Department of Chemistry, School of Science, The University of Tokyo, Hongo, 113-0033, Bunkyo-ku, Tokyo, Japan.,Green & Sustainable Chemistry Social Cooperation Laboratory, Graduate School of Science, The University of Tokyo, Hongo, 113-0033, Bunkyo-ku, Tokyo, Japan
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21
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Liu Q, Yang L, Yao C, Geng J, Wu Y, Hu X. Controlling the Lewis Acidity and Polymerizing Effectively Prevent Frustrated Lewis Pairs from Deactivation in the Hydrogenation of Terminal Alkynes. Org Lett 2021; 23:3685-3690. [PMID: 33877853 DOI: 10.1021/acs.orglett.1c01073] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Two strategies were reported to prevent the deactivation of Frustrated Lewis pairs (FLPs) in the hydrogenation of terminal alkynes: reducing the Lewis acidity and polymerizing the Lewis acid. A polymeric Lewis acid (P-BPh3) with high stability was designed and synthesized. Excellent conversion (up to 99%) and selectivity can be achieved in the hydrogenation of terminal alkynes catalyzed by P-BPh3. This catalytic system works quite well for different substrates. In addition, the P-BPh3 can be easily recycled.
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Affiliation(s)
- Qiang Liu
- School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
| | - Liu Yang
- School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
| | - Chenfei Yao
- School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
| | - Jiao Geng
- School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
| | - Youting Wu
- School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
| | - Xingbang Hu
- School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
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22
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Empel C, Nguyen TV, Koenigs RM. Tropylium-Catalyzed O–H Insertion Reactions of Diazoalkanes with Carboxylic Acids. Org Lett 2021; 23:548-553. [DOI: 10.1021/acs.orglett.0c04069] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Claire Empel
- RWTH Aachen University, Institute of Organic Chemistry, Landoltweg 1, D-52074 Aachen, Germany
| | - Thanh Vinh Nguyen
- School of Chemistry, University of New South Wales, Sydney 2052, NSW, Australia
| | - Rene M. Koenigs
- RWTH Aachen University, Institute of Organic Chemistry, Landoltweg 1, D-52074 Aachen, Germany
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23
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Hu S, Lu Z, Liu M, Xu H, Wu J, Chen F. TfOH-Catalyzed Cascade C-H Activation/Lactonization of Phenols with α-Aryl-α-diazoesters: Rapid Access to α-Aryl Benzofuranones. J Org Chem 2020; 85:14916-14925. [PMID: 32957783 DOI: 10.1021/acs.joc.0c01583] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Aryl benzofuranones are privileged structural units present in natural products and pharmaceutically relevant compounds with high bioactivity and therapeutic value; synthetic access to these scaffolds remains an area of intensive interest. A new and efficient TfOH-catalyzed cascade ortho C-H activation/lactonization of phenols with α-aryl-α-diazoacetates is reported. This metal-free protocol provides an operationally simple and rapid method for the one-pot assembly of diverse α-aryl benzofuranones in high yields with broad substrate scope, a readily starting material, good chemo-regioselectivity, and excellent functional group compatibility.
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Affiliation(s)
- Sha Hu
- Engineering Center of Catalysis and Synthesis for Chiral Molecules, Department of Chemistry, Fudan University, Shanghai 200433, China.,Shanghai Engineering Center of Industrial Catalysis for Chiral Drugs, Shanghai 200433, China
| | - Zuolin Lu
- Institute of Pharmaceutical Science and Technology, Zhejiang University of Technology, 18 Chao Wang Road, Hangzhou 310014, China
| | - Minjie Liu
- Engineering Center of Catalysis and Synthesis for Chiral Molecules, Department of Chemistry, Fudan University, Shanghai 200433, China.,Shanghai Engineering Center of Industrial Catalysis for Chiral Drugs, Shanghai 200433, China
| | - Hanlin Xu
- Engineering Center of Catalysis and Synthesis for Chiral Molecules, Department of Chemistry, Fudan University, Shanghai 200433, China.,Shanghai Engineering Center of Industrial Catalysis for Chiral Drugs, Shanghai 200433, China
| | - Jiale Wu
- Engineering Center of Catalysis and Synthesis for Chiral Molecules, Department of Chemistry, Fudan University, Shanghai 200433, China.,Shanghai Engineering Center of Industrial Catalysis for Chiral Drugs, Shanghai 200433, China
| | - Fener Chen
- Engineering Center of Catalysis and Synthesis for Chiral Molecules, Department of Chemistry, Fudan University, Shanghai 200433, China.,Shanghai Engineering Center of Industrial Catalysis for Chiral Drugs, Shanghai 200433, China.,Institute of Pharmaceutical Science and Technology, Zhejiang University of Technology, 18 Chao Wang Road, Hangzhou 310014, China
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24
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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.
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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
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25
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Transition‐Metal‐Free C(sp
2
)–C(sp
2
) Cross‐Coupling of Diazo Quinones with Catechol Boronic Esters. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202006542] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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26
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Dasgupta A, Stefkova K, Babaahmadi R, Gierlichs L, Ariafard A, Melen RL. Triarylborane-Catalyzed Alkenylation Reactions of Aryl Esters with Diazo Compounds. Angew Chem Int Ed Engl 2020; 59:15492-15496. [PMID: 32485034 PMCID: PMC7497215 DOI: 10.1002/anie.202007176] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Indexed: 11/08/2022]
Abstract
Herein we report a facile, mild reaction protocol to form carbon-carbon bonds in the absence of transition metal catalysts. We demonstrate the metal-free alkenylation reactions of aryl esters with α-diazoesters to give highly functionalized enyne products. Catalytic amounts of tris(pentafluorophenyl)borane (10-20 mol %) are employed to afford the C=C coupled products (31 examples) in good to excellent yields (36-87 %). DFT studies were used to elucidate the mechanism for this alkenylation reaction.
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Affiliation(s)
- Ayan Dasgupta
- Cardiff Catalysis InstituteSchool of ChemistryCardiff UniversityMain Building, Park PlaceCardiffCF10 3AT, Cymru/WalesUK
| | - Katarína Stefkova
- Cardiff Catalysis InstituteSchool of ChemistryCardiff UniversityMain Building, Park PlaceCardiffCF10 3AT, Cymru/WalesUK
| | - Rasool Babaahmadi
- School of Natural Sciences – ChemistryUniversity of TasmaniaPrivate Bag 75Hobart, Tasmania7001Australia
| | - Lukas Gierlichs
- Cardiff Catalysis InstituteSchool of ChemistryCardiff UniversityMain Building, Park PlaceCardiffCF10 3AT, Cymru/WalesUK
| | - Alireza Ariafard
- School of Natural Sciences – ChemistryUniversity of TasmaniaPrivate Bag 75Hobart, Tasmania7001Australia
| | - Rebecca L. Melen
- Cardiff Catalysis InstituteSchool of ChemistryCardiff UniversityMain Building, Park PlaceCardiffCF10 3AT, Cymru/WalesUK
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27
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28
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Dasgupta A, Babaahmadi R, Slater B, Yates BF, Ariafard A, Melen RL. Borane-Catalyzed Stereoselective C–H Insertion, Cyclopropanation, and Ring-Opening Reactions. Chem 2020. [DOI: 10.1016/j.chempr.2020.06.035] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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29
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Dasgupta A, Stefkova K, Babaahmadi R, Gierlichs L, Ariafard A, Melen RL. Triarylboran‐katalysierte Alkenylierungen von Arylestern mit Diazoverbindungen. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202007176] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Ayan Dasgupta
- Cardiff Catalysis Institute School of Chemistry Cardiff University Main Building, Park Place Cardiff CF10 3AT, Cymru/Wales UK
| | - Katarína Stefkova
- Cardiff Catalysis Institute School of Chemistry Cardiff University Main Building, Park Place Cardiff CF10 3AT, Cymru/Wales UK
| | - Rasool Babaahmadi
- School of Natural Sciences-Chemistry University of Tasmania Private Bag 75 Hobart, Tasmania 7001 Australien
| | - Lukas Gierlichs
- Cardiff Catalysis Institute School of Chemistry Cardiff University Main Building, Park Place Cardiff CF10 3AT, Cymru/Wales UK
| | - Alireza Ariafard
- School of Natural Sciences-Chemistry University of Tasmania Private Bag 75 Hobart, Tasmania 7001 Australien
| | - Rebecca L. Melen
- Cardiff Catalysis Institute School of Chemistry Cardiff University Main Building, Park Place Cardiff CF10 3AT, Cymru/Wales UK
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30
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Wu K, Wu LL, Zhou CY, Che CM. Transition-Metal-Free C(sp 2 )-C(sp 2 ) Cross-Coupling of Diazo Quinones with Catechol Boronic Esters. Angew Chem Int Ed Engl 2020; 59:16202-16208. [PMID: 32558142 DOI: 10.1002/anie.202006542] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Indexed: 12/11/2022]
Abstract
A transition-metal-free C(sp2 )-C(sp2 ) bond formation reaction by the cross-coupling of diazo quinones with catechol boronic esters was developed. With this protocol, a variety of biaryls and alkenyl phenols were obtained in good to high yields under mild conditions. The reaction tolerates various functionalities and is applicable to the derivatization of pharmaceuticals and natural products. The synthetic utility of the method was demonstrated by the short synthesis of multi-substituted triphenylenes and three bioactive natural products, honokiol, moracin M, and stemofuran A. Mechanistic studies and density functional theory (DFT) calculations revealed that the reaction involves attack of the boronic ester by a singlet quinone carbene followed by a 1,2-rearrangement through a stepwise mechanism.
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Affiliation(s)
- Kai Wu
- State Key Laboratory of Synthetic Chemistry, Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, China.,HKU Shenzhen Institute of Research & Innovation, Shenzhen, China
| | - Liang-Liang Wu
- State Key Laboratory of Synthetic Chemistry, Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, China
| | - Cong-Ying Zhou
- State Key Laboratory of Synthetic Chemistry, Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, China.,HKU Shenzhen Institute of Research & Innovation, Shenzhen, China.,Present address: College of Chemistry and Materials Science, Jinan University, Guangzhou, China
| | - Chi-Ming Che
- State Key Laboratory of Synthetic Chemistry, Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, China.,HKU Shenzhen Institute of Research & Innovation, Shenzhen, China
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31
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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.
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Affiliation(s)
- Jamie L Carden
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, Cymru/Wales, UK.
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32
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Gazis TA, Mohajeri Thaker BAJ, Willcox D, Ould DMC, Wenz J, Rawson JM, Hill MS, Wirth T, Melen RL. 1,3-Carboboration of iodonium ylides. Chem Commun (Camb) 2020; 56:3345-3348. [DOI: 10.1039/c9cc08749d] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein, we disclose the utilisation of iodonium ylides to access a range of boron dienolates.
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Affiliation(s)
- Theodore A. Gazis
- Cardiff Catalysis Institute
- School of Chemistry
- Cardiff University
- Cardiff
- UK
| | | | - Darren Willcox
- Cardiff Catalysis Institute
- School of Chemistry
- Cardiff University
- Cardiff
- UK
| | - Darren M. C. Ould
- Cardiff Catalysis Institute
- School of Chemistry
- Cardiff University
- Cardiff
- UK
| | - Jan Wenz
- Cardiff Catalysis Institute
- School of Chemistry
- Cardiff University
- Cardiff
- UK
| | - Jeremy M. Rawson
- Department of Chemistry and Biochemistry
- University of Windsor
- Ontario N9B 3P4
- Canada
| | | | | | - Rebecca L. Melen
- Cardiff Catalysis Institute
- School of Chemistry
- Cardiff University
- Cardiff
- UK
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33
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Cao LL, Zhou J, Qu Z, Stephan DW. Single Electron Transfer to Diazomethane-Borane Adducts Prompts C-H Bond Activations. Angew Chem Int Ed Engl 2019; 58:18487-18491. [PMID: 31589360 PMCID: PMC6972512 DOI: 10.1002/anie.201912338] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Indexed: 12/31/2022]
Abstract
While (Ph2 CN2 )B(C6 F5 )3 is unstable, single electron transfer from Cp*2 Co affords the isolation of stable products [Cp*2 Co][Ph2 CNNHB(C6 F5 )3 ] 1 and [Cp*Co(C5 Me4 CH2 B(C6 F5 )3 )] 2. The analogous combination of Ph2 CN2 and BPh3 showed no evidence of adduct formation and yet single electron transfer from Cp*2 Cr affords the species [Cp*2 Cr][PhC(C6 H4 )NNBPh3 ] 3 and [Cp*2 Cr][Ph2 CNNHBPh3 ] 4. Computations showed both reactions proceed via transient radical anions of the diphenyldiazomethane-borane adducts to effect C-H bond activations.
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Affiliation(s)
- Levy L. Cao
- Department of ChemistryUniversity of Toronto80 St. George St.TorontoOntarioM5S3H6Canada
| | - Jiliang Zhou
- Department of ChemistryUniversity of Toronto80 St. George St.TorontoOntarioM5S3H6Canada
| | - Zheng‐Wang Qu
- Mulliken Center for Theoretical ChemistryInstitut für Physikalische und Theoretische ChemieRheinische Friedrich-Wilhelms-Universität BonnBeringstrasse 453115BonnGermany
| | - Douglas W. Stephan
- Department of ChemistryUniversity of Toronto80 St. George St.TorontoOntarioM5S3H6Canada
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34
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Cao LL, Zhou J, Qu Z, Stephan DW. Single Electron Transfer to Diazomethane–Borane Adducts Prompts C−H Bond Activations. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201912338] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Levy L. Cao
- Department of ChemistryUniversity of Toronto 80 St. George St. Toronto Ontario M5S3H6 Canada
| | - Jiliang Zhou
- Department of ChemistryUniversity of Toronto 80 St. George St. Toronto Ontario M5S3H6 Canada
| | - Zheng‐Wang Qu
- Mulliken Center for Theoretical ChemistryInstitut für Physikalische und Theoretische ChemieRheinische Friedrich-Wilhelms-Universität Bonn Beringstrasse 4 53115 Bonn Germany
| | - Douglas W. Stephan
- Department of ChemistryUniversity of Toronto 80 St. George St. Toronto Ontario M5S3H6 Canada
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35
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Liu C, Wu S, Sun W, Meng H, Xing S, Zhu B. Rapid and Efficient Construction of Indolizino[3,4,5‐
ab
]isoindole Skeletons by a Rhodium‐Catalyzed Tandem Reaction. ASIAN J ORG CHEM 2019. [DOI: 10.1002/ajoc.201900660] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Chang Liu
- Tianjin Key Laboratory of Structure and Performance for Functional MoleculesKey Laboratory of Inorganic-Organic Hybrid Functional Material ChemistryMinistry of Education (Tianjin Normal University)College of ChemistryTianjin Normal University Tianjin 300387 People's Republic of China
| | - Shaonan Wu
- Tianjin Key Laboratory of Structure and Performance for Functional MoleculesKey Laboratory of Inorganic-Organic Hybrid Functional Material ChemistryMinistry of Education (Tianjin Normal University)College of ChemistryTianjin Normal University Tianjin 300387 People's Republic of China
| | - Wan Sun
- Tianjin Key Laboratory of Structure and Performance for Functional MoleculesKey Laboratory of Inorganic-Organic Hybrid Functional Material ChemistryMinistry of Education (Tianjin Normal University)College of ChemistryTianjin Normal University Tianjin 300387 People's Republic of China
| | - Haifang Meng
- Tianjin Key Laboratory of Structure and Performance for Functional MoleculesKey Laboratory of Inorganic-Organic Hybrid Functional Material ChemistryMinistry of Education (Tianjin Normal University)College of ChemistryTianjin Normal University Tianjin 300387 People's Republic of China
| | - Siyang Xing
- Tianjin Key Laboratory of Structure and Performance for Functional MoleculesKey Laboratory of Inorganic-Organic Hybrid Functional Material ChemistryMinistry of Education (Tianjin Normal University)College of ChemistryTianjin Normal University Tianjin 300387 People's Republic of China
| | - Bolin Zhu
- Tianjin Key Laboratory of Structure and Performance for Functional MoleculesKey Laboratory of Inorganic-Organic Hybrid Functional Material ChemistryMinistry of Education (Tianjin Normal University)College of ChemistryTianjin Normal University Tianjin 300387 People's Republic of China
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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.
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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.
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