1
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Zhai G, Liu Q, Ji J, Wu Y, Geng J, Hu X. Recyclable polymerized Lewis acid poly-BPh(C6F5)2 catalyzed selective N-formylation and N-methylation of amines with carbon dioxide and phenylsilanes. J CO2 UTIL 2022. [DOI: 10.1016/j.jcou.2022.102052] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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2
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Chen C, Li J, Daniliuc CG, Mück‐Lichtenfeld C, Kehr G, Erker G. The [(NHC)B(H)C
6
F
5
]
+
Cations and Their [B](H)−CO Borane Carbonyls. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202009353] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Chaohuang Chen
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Münster Corrensstraße 40 48149 Münster Germany
| | - Jun Li
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Münster Corrensstraße 40 48149 Münster Germany
| | - Constantin G. Daniliuc
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Münster Corrensstraße 40 48149 Münster Germany
| | - Christian Mück‐Lichtenfeld
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Münster Corrensstraße 40 48149 Münster Germany
| | - Gerald Kehr
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Münster Corrensstraße 40 48149 Münster Germany
| | - Gerhard Erker
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Münster Corrensstraße 40 48149 Münster Germany
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3
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Chen C, Li J, Daniliuc CG, Mück-Lichtenfeld C, Kehr G, Erker G. The [(NHC)B(H)C 6 F 5 ] + Cations and Their [B](H)-CO Borane Carbonyls. Angew Chem Int Ed Engl 2020; 59:21460-21464. [PMID: 32705756 DOI: 10.1002/anie.202009353] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Indexed: 11/11/2022]
Abstract
Hydride abstraction from the heterocyclic carbene borane adducts (NHC)BH2 C6 F5 (NHC: IMes or IMe4 ) gave the B-H containing [(NHC)B(H)C6 F5 ]+ borenium cations. They added carbon monoxide to give the respective [(NHC)B(H)(C6 F5 )CO]+ boron carbonyl cations. Carbon nucleophiles add to the boron carbonyl to give [B](H) acyls. Hydride reduced the [B]CO cation to hydroxymethylborane derivatives.
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Affiliation(s)
- Chaohuang Chen
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 40, 48149, Münster, Germany
| | - Jun Li
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 40, 48149, Münster, Germany
| | - Constantin G Daniliuc
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 40, 48149, Münster, Germany
| | - Christian Mück-Lichtenfeld
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 40, 48149, Münster, Germany
| | - Gerald Kehr
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 40, 48149, Münster, Germany
| | - Gerhard Erker
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 40, 48149, Münster, Germany
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4
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Walker JCL, Oestreich M. Lewis Acid Catalyzed Transfer Hydromethallylation for the Construction of Quaternary Carbon Centers. Angew Chem Int Ed Engl 2019; 58:15386-15389. [PMID: 31449730 PMCID: PMC6856816 DOI: 10.1002/anie.201909852] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2019] [Indexed: 12/18/2022]
Abstract
The design and gram-scale synthesis of a cyclohexa-1,4-diene-based surrogate of isobutene gas is reported. Using the highly electron-deficient Lewis acid B(C6 F5 )3 , application of this surrogate in the hydromethallylation of electron-rich styrene derivatives provided sterically congested quaternary carbon centers. The reaction proceeds by C(sp3 )-C(sp3 ) bond formation at a tertiary carbenium ion that is generated by alkene protonation. The possibility of two concurrent mechanisms is proposed on the basis of mechanistic experiments using a deuterated surrogate.
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Affiliation(s)
- Johannes C. L. Walker
- Institut für ChemieTechnische Universität BerlinStrasse des 17. Juni 11510623BerlinGermany
| | - Martin Oestreich
- Institut für ChemieTechnische Universität BerlinStrasse des 17. Juni 11510623BerlinGermany
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5
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Walker JCL, Oestreich M. Lewis Säure‐katalysierte Transferhydromethallylierung für den Aufbau quartärer Kohlenstoffzentren. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201909852] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Johannes C. L. Walker
- Institut für Chemie Technische Universität Berlin Straße des 17. Juni 115 10623 Berlin Deutschland
| | - Martin Oestreich
- Institut für Chemie Technische Universität Berlin Straße des 17. Juni 115 10623 Berlin Deutschland
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6
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Guru MM, De S, Dutta S, Koley D, Maji B. B(C 6F 5) 3-catalyzed dehydrogenative cyclization of N-tosylhydrazones and anilines via a Lewis adduct: a combined experimental and computational investigation. Chem Sci 2019; 10:7964-7974. [PMID: 31853352 PMCID: PMC6839809 DOI: 10.1039/c9sc02492a] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Accepted: 07/05/2019] [Indexed: 12/19/2022] Open
Abstract
Tris(pentafluorophenyl)borane-catalyzed dehydrogenative-cyclization of N-tosylhydrazones with aromatic amines has been disclosed. This metal-free catalytic protocol is compatible with a range of functional groups to provide both symmetrical and unsymmetrical 3,4,5-triaryl-1,2,4-triazoles. Mechanistic experiments and density functional theory (DFT) studies suggest an initial Lewis adduct formation of N-tosylhydrazone with B(C6F5)3 followed by sequential intermolecular amination of the borane adduct with aniline, intramolecular cyclization and frustrated Lewis pair (FLP)-catalyzed dehydrogenation for the generation of substituted 1,2,4-triazoles.
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Affiliation(s)
- Murali Mohan Guru
- Department of Chemical Sciences , Indian Institute of Science Education and Research Kolkata , Mohanpur-741246 , India . ;
| | - Sriman De
- Department of Chemical Sciences , Indian Institute of Science Education and Research Kolkata , Mohanpur-741246 , India . ;
| | - Sayan Dutta
- Department of Chemical Sciences , Indian Institute of Science Education and Research Kolkata , Mohanpur-741246 , India . ;
| | - Debasis Koley
- Department of Chemical Sciences , Indian Institute of Science Education and Research Kolkata , Mohanpur-741246 , India . ;
| | - Biplab Maji
- Department of Chemical Sciences , Indian Institute of Science Education and Research Kolkata , Mohanpur-741246 , India . ;
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7
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Kalelkar PP, Geng Z, Finn MG, Collard DM. Azide-Substituted Polylactide: A Biodegradable Substrate for Antimicrobial Materials via Click Chemistry Attachment of Quaternary Ammonium Groups. Biomacromolecules 2019; 20:3366-3374. [DOI: 10.1021/acs.biomac.9b00504] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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8
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Adak T, Schulmeister J, Dietl MC, Rudolph M, Rominger F, Hashmi ASK. Gold-Catalyzed Highly Chemo- and Regioselective C-H Bond Functionalization of Phenols with Haloalkynes. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900653] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Tapas Adak
- Organisch-Chemisches Institut; Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Jürgen Schulmeister
- Organisch-Chemisches Institut; Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Martin C. Dietl
- Organisch-Chemisches Institut; Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Matthias Rudolph
- Organisch-Chemisches Institut; Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Frank Rominger
- Organisch-Chemisches Institut; Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - A. Stephen K. Hashmi
- Organisch-Chemisches Institut; Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
- Chemistry Department; Faculty of Science; King Abdulaziz University; 21589 Jeddah Saudi Arabia
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9
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Abstract
The study of main-group molecules that behave and react similarly to transition-metal (TM) complexes has attracted significant interest in recent decades. Most notably, the attractive idea of replacing the all-too-often rare and costly metals from catalysis has motivated efforts to develop main-group-element-mediated reactions. Main-group elements, however, lack the electronic flexibility of TM complexes that arises from combinations of empty and filled d orbitals and that seem ideally suited to bind and activate many substrates. In this review, we look at boron, an element that despite its nonmetal nature, low atomic weight, and relative redox staticity has achieved great milestones in terms of TM-like reactivity. We show how in interelement cooperative systems, diboron molecules, and hypovalent complexes the fifth element can acquire a truly metallomimetic character. As we discuss, this character is powerfully demonstrated by the reactivity of boron-based molecules with H2, CO, alkynes, alkenes and even with N2.
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10
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Liu W, Zeng R, Han Y, Wang Y, Tao H, Chen Y, Liu F, Liang Y. Computational and experimental investigation on the BCl3 promoted intramolecular amination of alkenes and alkynes. Org Biomol Chem 2019; 17:2776-2783. [DOI: 10.1039/c9ob00264b] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The BCl3 promoted aminoboration of alkenes and alkynes was investigated both computationally and experimentally, leading to the discovery of a metal-free hydroamination of alkynes.
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Affiliation(s)
- Wei Liu
- State Key Laboratory of Coordination Chemistry
- Jiangsu Key Laboratory of Advanced Organic Materials
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
| | - Ruxin Zeng
- State Key Laboratory of Coordination Chemistry
- Jiangsu Key Laboratory of Advanced Organic Materials
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
| | - Yingbin Han
- State Key Laboratory of Coordination Chemistry
- Jiangsu Key Laboratory of Advanced Organic Materials
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
| | - Yajun Wang
- State Key Laboratory of Coordination Chemistry
- Jiangsu Key Laboratory of Advanced Organic Materials
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
| | - Huimin Tao
- State Key Laboratory of Coordination Chemistry
- Jiangsu Key Laboratory of Advanced Organic Materials
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
| | - Yu Chen
- State Key Laboratory of Coordination Chemistry
- Jiangsu Key Laboratory of Advanced Organic Materials
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
| | - Fang Liu
- College of Sciences
- Nanjing Agricultural University
- Nanjing 210095
- China
| | - Yong Liang
- State Key Laboratory of Coordination Chemistry
- Jiangsu Key Laboratory of Advanced Organic Materials
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
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11
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Li Y, Huang D, Huang J, Liu Y, Maruoka K. Chemoselective Preparation of 1-Iodoalkynes, 1,2-Diiodoalkenes, and 1,1,2-Triiodoalkenes Based on the Oxidative Iodination of Terminal Alkynes. J Vis Exp 2018. [PMID: 30272667 DOI: 10.3791/58063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
We present the chemoselective synthesis of 1-(iodoethynyl)-4-methylbenzene, 1-(1,2-diiodovinyl)-4-methylbenzene, and 1-methyl-4-(1,2,2-triiodovinyl)benzene as representative examples for the practical chemoselective preparation of 1-iodoalkynes, 1,2-diiodoalkenes, and 1,1,2-triiodoalkenes from the chemoselective iodination of terminal alkynes mediated by hypervalent-iodine reagents. The chemoselectivity was confirmed by using p-tolylethyne as a model substrate to screen a variety of iodine sources and/or the hypervalent-iodine reagents. A combination of tetrabutylammonium iodide (TBAI) and (diacetoxyiodo)benzene (PIDA) selectively generates 1-iodoalkynes, while a combination of KI and PIDA generates 1,2-diiodoalkenes. A one-pot synthesis based on both TBAI-PIDA and KI-PIDA yields the corresponding 1,1,2-triiodoalkenes. These protocols were subsequently applied to the synthesis of synthetically important aromatic and aliphatic 1-iodoalkynes, 1,2-diiodoalkenes, and 1,1,2-triiodoalkenes, which were obtained in good yield with excellent chemoselectivity.
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Affiliation(s)
- Youzhi Li
- School of Chemical Engineering and Light Industry, Guangdong University of Technology
| | - Daya Huang
- School of Chemical Engineering and Light Industry, Guangdong University of Technology
| | - Ju Huang
- School of Chemical Engineering and Light Industry, Guangdong University of Technology
| | - Yan Liu
- School of Chemical Engineering and Light Industry, Guangdong University of Technology;
| | - Keiji Maruoka
- School of Chemical Engineering and Light Industry, Guangdong University of Technology; Department of Chemistry, Graduate School of Science, Kyoto University;
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12
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Wilkins LC, Soltani Y, Lawson JR, Slater B, Melen RL. Divergent Elementoboration: 1,3-Haloboration versus 1,1-Carboboration of Propargyl Esters. Chemistry 2018; 24:7364-7368. [PMID: 29700863 PMCID: PMC6055811 DOI: 10.1002/chem.201801493] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Indexed: 01/03/2023]
Abstract
This work showcases the 1,3-haloboration reaction of alkynes in which boron and chlorine add to propargyl systems in a proposed sequential oxazoliumborate formation with subsequent ring-opening and chloride migration. In addition, the functionalization of these propargyl esters with dimethyl groups in the propargylic position leads to stark differences in reactivity whereby a formal 1,1-carboboration prevails to give the 2,2-dichloro-3,4-dihydrodioxaborinine products as an intramolecular chelate. Density functional theory calculations are used to rationalize the distinct carboboration and haloboration pathways. Significantly, this method represents a metal-free route to highly functionalized compounds in a single step to give structurally complex products.
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Affiliation(s)
- Lewis C Wilkins
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, Cymru/Wales, UK
| | - Yashar Soltani
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, Cymru/Wales, UK
| | - James R Lawson
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, Cymru/Wales, UK
| | - Ben Slater
- Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK
| | - Rebecca L Melen
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, Cymru/Wales, UK
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13
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Wang T, Daniliuc CG, Mück-Lichtenfeld C, Kehr G, Erker G. Formation of Reactive π-Conjugated Frustrated N/B Pairs by Borane-Induced Propargyl Amine Rearrangement. J Am Chem Soc 2018; 140:3635-3643. [PMID: 29444567 DOI: 10.1021/jacs.7b11958] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
N-Propargyltetramethylpiperidine reacts with a series of trans-alkenyl-B(C6F5)2 compounds to give the substituted alkenyl-bridged frustrated N/B Lewis pairs 5. Their structures and spectroscopic features indicate a pronounced participation of the mesomeric s-trans-iminium/borata-alkene resonance form. The compounds are thought to be formed in a stepwise addition/rearrangement process which is initiated by a trans-1,2-amine/borane FLP addition to the carbon-carbon triple bond to generate a reactive zwitterionic aziridinium/alkenylborate intermediate. Subsequent alkenylborate attack leads to opening of the activated three-membered heterocycle with clean formation of the products 5a-c. Treatment of the propargyl-TMP substrate with B(C6F5)3 gave a stable example of such an aziridinium/borate betaine, which was isolated and amply characterized. The products 5a-c are active N/B FLPs. They split dihydrogen heterolytically under mild conditions to give the respective NH+/BH- products 9a-c. These contain Z-configurated core C═C double bonds, which indicates rotational equilibration around the central C-C bond of 5a-c during this reaction. Structural and chemical features of the 5c system were analyzed by DFT calculations.
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Affiliation(s)
- Tongdao Wang
- Organisch-Chemisches Institut , Westfälische Wilhelms-Universität Münster , Corrensstraße 40 , 48149 Münster , Germany
| | - Constantin G Daniliuc
- Organisch-Chemisches Institut , Westfälische Wilhelms-Universität Münster , Corrensstraße 40 , 48149 Münster , Germany
| | - Christian Mück-Lichtenfeld
- Organisch-Chemisches Institut , Westfälische Wilhelms-Universität Münster , Corrensstraße 40 , 48149 Münster , Germany
| | - Gerald Kehr
- Organisch-Chemisches Institut , Westfälische Wilhelms-Universität Münster , Corrensstraße 40 , 48149 Münster , Germany
| | - Gerhard Erker
- Organisch-Chemisches Institut , Westfälische Wilhelms-Universität Münster , Corrensstraße 40 , 48149 Münster , Germany
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14
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Saptal VB, Juneja G, Bhanage BM. B(C6F5)3: a robust catalyst for the activation of CO2 and dimethylamine borane for the N-formylation reactions. NEW J CHEM 2018. [DOI: 10.1039/c8nj02816h] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this work, B(C6F5)3 is utilized as an organocatalyst for the transition-metal-free N-formylation of amines using carbon dioxide (CO2) as a C1 source and dimethylamine borane (Me2NH·BH3) as a green hydrogen transfer source at 80 °C.
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Affiliation(s)
- Vitthal B. Saptal
- Department of Chemistry
- Institute of Chemical Technology (Autonomous)
- Matunga
- Mumbai
- India
| | - Gaurav Juneja
- Department of Chemistry
- Institute of Chemical Technology (Autonomous)
- Matunga
- Mumbai
- India
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15
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Radcliffe JE, Dunsford JJ, Cid J, Fasano V, Ingleson MJ. N-Heterocycle-Ligated Borocations as Highly Tunable Carbon Lewis Acids. Organometallics 2017; 36:4952-4960. [PMID: 29430073 PMCID: PMC5803673 DOI: 10.1021/acs.organomet.7b00779] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2017] [Indexed: 11/28/2022]
Abstract
![]()
The relative (to
BEt3) hydride ion affinity (HIA) of
a series of acridine borenium salts has been calculated, with some
HIAs found to be similar to that for [Ph3C]+. The HIA at the acridine C9 position is controlled by both acridine
and the boron substituents, the latter presumably affecting the strength
of the B=N bond in the acridane-BY2 products from
hydride transfer. Through a range of hydride abstraction benchmarking
reactions against organic hydride donors the experimental HIA of [F5acr-BCat]+ (cat = catechol, F5acr =
1,2,3,4,7-pentafluoroacridine) has been confirmed to be extremely
high and closely comparable to that of [Ph3C]+. The high HIA of [F5acr-BCat]+ enables H2 and alkene activation in a FLP with 2,6-di-tert-butylpyridine. Finally, the HIA of pyridine and quinoline borenium
cations has been determined, with the HIA at boron in [PinB(amine)]+ (pin = pinacol, amine = pyridine or quinoline) found to be
relatively low. This enabled the hydroboration of pyridine and quinoline
by HBPin to be achieved through the addition of 5–10 mol %
of bench-stable cationic carbon Lewis acids such as 2-phenyl-N,N-dimethylimidazolium salts.
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Affiliation(s)
- James E Radcliffe
- School of Chemistry, The University of Manchester, Manchester M13 9PL, United Kingdom
| | - Jay J Dunsford
- School of Chemistry, The University of Manchester, Manchester M13 9PL, United Kingdom
| | - Jessica Cid
- School of Chemistry, The University of Manchester, Manchester M13 9PL, United Kingdom
| | - Valerio Fasano
- School of Chemistry, The University of Manchester, Manchester M13 9PL, United Kingdom
| | - Michael J Ingleson
- School of Chemistry, The University of Manchester, Manchester M13 9PL, United Kingdom
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16
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Liu Y, Huang D, Huang J, Maruoka K. Hypervalent Iodine Mediated Chemoselective Iodination of Alkynes. J Org Chem 2017; 82:11865-11871. [PMID: 28803465 DOI: 10.1021/acs.joc.7b01555] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Reported herein are practical approaches for the chemoselective mono-, di-, and tri-iodination of alkynes based on efficient oxidative iodinations catalyzed by hypervalent iodine reagents. The reaction conditions were systematically optimized by altering the iodine source and/or the hypervalent iodine reagent system. The tetrabutylammonium iodide (TBAI)/(diacetoxyiodo)benzene (PIDA) system is specific for monoiodination, while the KI/PIDA system results in di-iodination. Combining the TBAI/PIDA and KI/PIDA systems in one pot provided the corresponding tri-iodination products efficiently. These reaction conditions can be applied to the synthetically important iodination of aromatic and aliphatic alkynes, which was accomplished in good yield (up to 99%) and excellent chemoselectivity. These synthetic methods can also be applied to the efficient chemoselective synthesis of iodoalkyne derivatives, intermediates, and related biologically active compounds.
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Affiliation(s)
- Yan Liu
- School of Chemical Engineering and Light Industry, Guangdong University of Technology , No.100, West Waihuan Road, HEMC, Panyu District, Guangzhou 510006, China
| | - Daya Huang
- School of Chemical Engineering and Light Industry, Guangdong University of Technology , No.100, West Waihuan Road, HEMC, Panyu District, Guangzhou 510006, China
| | - Ju Huang
- School of Chemical Engineering and Light Industry, Guangdong University of Technology , No.100, West Waihuan Road, HEMC, Panyu District, Guangzhou 510006, China
| | - Keiji Maruoka
- School of Chemical Engineering and Light Industry, Guangdong University of Technology , No.100, West Waihuan Road, HEMC, Panyu District, Guangzhou 510006, China.,Department of Chemistry, Graduate School of Science, Kyoto University , Sakyo, Kyoto 606-8502, Japan
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17
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Lawson JR, Melen RL. Tris(pentafluorophenyl)borane and Beyond: Modern Advances in Borylation Chemistry. Inorg Chem 2017; 56:8627-8643. [DOI: 10.1021/acs.inorgchem.6b02911] [Citation(s) in RCA: 153] [Impact Index Per Article: 21.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- James R. Lawson
- School of Chemistry, Cardiff University, Main Building, Cardiff CF10 3AT, Wales
| | - Rebecca L. Melen
- School of Chemistry, Cardiff University, Main Building, Cardiff CF10 3AT, Wales
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18
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Warner AJ, Churn A, McGough JS, Ingleson MJ. BCl
3
‐Induced Annulative Oxo‐ and Thioboration for the Formation of C3‐Borylated Benzofurans and Benzothiophenes. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201610014] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Andrew J. Warner
- School of Chemistry University of Manchester Oxford Road Manchester M13 9PL UK
| | - Anna Churn
- School of Chemistry University of Manchester Oxford Road Manchester M13 9PL UK
| | - John S. McGough
- School of Chemistry University of Manchester Oxford Road Manchester M13 9PL UK
| | - Michael J. Ingleson
- School of Chemistry University of Manchester Oxford Road Manchester M13 9PL UK
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19
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Warner AJ, Churn A, McGough JS, Ingleson MJ. BCl 3 -Induced Annulative Oxo- and Thioboration for the Formation of C3-Borylated Benzofurans and Benzothiophenes. Angew Chem Int Ed Engl 2016; 56:354-358. [PMID: 27897368 PMCID: PMC5396270 DOI: 10.1002/anie.201610014] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Indexed: 11/06/2022]
Abstract
BCl3 -induced borylative cyclization of aryl-alkynes possessing ortho-EMe (E=S, O) groups represents a simple, metal-free method for the formation of C3-borylated benzothiophenes and benzofurans. The dichloro(heteroaryl)borane primary products can be protected to form synthetically ubiquitous pinacol boronate esters or used in situ in Suzuki-Miyaura cross couplings to generate 2,3-disubstituted heteroarenes from simple alkyne precursors in one pot. In a number of cases alkyne trans-haloboration occurs alongside, or instead of, borylative cyclization and the factors controlling the reaction outcome are determined.
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Affiliation(s)
- Andrew J Warner
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Anna Churn
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - John S McGough
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Michael J Ingleson
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
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