1
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Sharma M, Fritz RM, Bhatia H, Adebanjo JO, Lu Z, Omary MA, Cundari TR, Choudhury A, Stavropoulos P. C-H amination chemistry mediated by trinuclear Cu(I) sites supported by a ligand scaffold featuring an arene platform and tetramethylguanidinyl residues. Dalton Trans 2024; 53:15946-15958. [PMID: 39264342 DOI: 10.1039/d4dt01670j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/13/2024]
Abstract
Tripodal ligands that can encapsulate single or multiple metal sites in C3-symmetric geometric configurations constitute valuable targets for novel catalysts. Of particular interest in ligand development are efforts toward incorporating apical elements that exhibit little if any electron donicity, to enhance the electrophilic nature of a trans positioned active oxidant (e.g., metal-oxo, -nitrene). The tripodal ligand TMG3trphen-Arene has been synthesized, featuring an arene platform 1,3,5-substituted with phenylene arms possessing tetramethylguanidinyl (TMG) residues. Compound [(TMG3trphen-Arene)Cu3(μ-Cl)3] has been subsequently synthesized by extracting a Cu3(μ-Cl)3 cluster from anhydrous CuCl and shown to encapsulate a crown-shaped Cu3(μ-Cl)3 fragment, supported by Cu-NTMG bonds and modest Cu3⋯arene long-range contacts. Energy decomposition analysis (EDA) indicates that electrostatic contributions to the total interaction energy far exceed those due to orbital interactions. The latter involve orbital pairings largely associated with the NTMG stabilization of the Cu3(μ-Cl)3 cluster. The independent gradient model based on the Hirshfeld partition (IGMH) corroborates that contacts between the arene platform and the Cu3 triangle are noncovalent in nature. Catalyst [(TMG3trphen-Arene)Cu3(μ-Cl)3] enables amination of sec-benzylic and tert-C-H bonds of a panel of substrates by pre-synthesized PhINTces in solvent matrices that incorporate small amounts of HFIP. The involvement of an electrophilic aminating agent is evidenced by the better yields obtained for electron-rich benzylic sites and is further supported by Hammett analysis that reveals the development of a small positive charge during C-H bond activation. A rather modest KIE effect (2.1) is obtained from intramolecular H(D) competition in the amination of ethylbenzene, at the borderline of reported values for concerted and stepwise C-H amination systems. DFT analysis of the putative copper-nitrene oxidant indicates that the nitrene N atom is bridging between two copper sites in closely spaced triplet (ground state) and broken-symmetry singlet electronic configurations.
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Affiliation(s)
- Meenakshi Sharma
- Department of Chemistry, Missouri University of Science and Technology, Rolla, MO 65409, USA.
| | - Reece M Fritz
- Department of Chemistry, Missouri University of Science and Technology, Rolla, MO 65409, USA.
| | - Himanshu Bhatia
- Department of Chemistry, Missouri University of Science and Technology, Rolla, MO 65409, USA.
| | - Joseph O Adebanjo
- Department of Chemistry, University of North Texas, Denton, TX 76203, USA
| | - Zhou Lu
- Department of Chemistry, University of North Texas, Denton, TX 76203, USA
| | - Mohammad A Omary
- Department of Chemistry, University of North Texas, Denton, TX 76203, USA
| | - Thomas R Cundari
- Department of Chemistry, University of North Texas, Denton, TX 76203, USA
| | - Amitava Choudhury
- Department of Chemistry, Missouri University of Science and Technology, Rolla, MO 65409, USA.
| | - Pericles Stavropoulos
- Department of Chemistry, Missouri University of Science and Technology, Rolla, MO 65409, USA.
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2
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Yang YZ, Xue Q, Xiong ZQ, Li Y, Ouyang XH, Hu M, Li JH. Divergent [2 + n] Heteroannulation of β-CF 3-1,3-enynes with Alkyl Azides via Hydrogen Atom Transfer and Radical Substitution. Org Lett 2024; 26:889-894. [PMID: 38251851 DOI: 10.1021/acs.orglett.3c04041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2024]
Abstract
A copper-promoted divergent intermolecular [2 + n] heteroannulation of β-CF3-1,3-enynes with alkyl azides via alkyl radical-driven HAT and radical substitution (C-C bond formation) to form four- to ten-membered saturated N-heterocycles is developed. This method enables the aryl-induced or kinetically controlled site selective functionalization of the remote C(sp3)-H bonds at positions 2, 3, 4, 5, 6, 7, or 8 toward the nitrogen atom through triplet nitrene formation, radical addition across the C═C bond, HAT and radical substitution cascades, and features a broad substrate scope, excellent site selectivity, and facile late-stage derivatization of bioactive molecules. Initial deuterium-labeling and control experiments shed light on the reaction mechanism via nitrene formation and HAT.
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Affiliation(s)
- Yu-Zhong Yang
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, China
- State Key Laboratory Base of Eco-Chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Qi Xue
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, China
| | - Zhi-Qiang Xiong
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, China
| | - Yang Li
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, China
| | - Xuan-Hui Ouyang
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, China
| | - Ming Hu
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, China
- State Key Laboratory Base of Eco-Chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Jin-Heng Li
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, China
- State Key Laboratory Base of Eco-Chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China
- School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 475004, China
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3
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Noda H, Asada Y, Shibasaki M. Examining the effects of additives and precursors on the reactivity of rhodium alkyl nitrenes generated from substituted hydroxylamines. Front Chem 2023; 11:1271896. [PMID: 38025067 PMCID: PMC10654751 DOI: 10.3389/fchem.2023.1271896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Accepted: 10/23/2023] [Indexed: 12/01/2023] Open
Abstract
In this study, the reactivity of the alkyl nitrenes, generated from the substituted hydroxylamine precursors, was determined using the same rhodium catalyst. The results revealed that in competitive C-H insertion experiments, the regioselectivity between benzylic and tertiary C-H bonds could be modulated by adding Brønsted acids or changing the substituents on oxygen. This study enhances our understanding of the metallonitrene structures and provides valuable insights for further development of selective N-heterocycle syntheses.
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Affiliation(s)
- Hidetoshi Noda
- Institute of Microbial Chemistry (BIKAKEN), Tokyo, Japan
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4
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Domenianni LI, Bauer M, Schmidt-Räntsch T, Lindner J, Schneider S, Vöhringer P. Photoinduced Metallonitrene Formation by N 2 Elimination from Azide Diradical Ligands. Angew Chem Int Ed Engl 2023; 62:e202309618. [PMID: 37549374 DOI: 10.1002/anie.202309618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 08/04/2023] [Accepted: 08/07/2023] [Indexed: 08/09/2023]
Abstract
Transition-metal nitrides/nitrenes are highly promising reagents for catalytic nitrogen-atom-transfer reactivity. They are typically prepared in situ upon optically induced N2 elimination from azido precursors. A full exploitation of their catalytic potential, however, requires in-depth knowledge of the primary photo-induced processes and the structural/electronic factors mediating the N2 loss with birth of the terminal metal-nitrogen core. Using femtosecond infrared spectroscopy, we elucidate here the primary molecular-level mechanisms responsible for the formation of a unique platinum(II) nitrene with a triplet ground state from a closed-shell platinum(II) azide precursor. The spectroscopic data in combination with quantum-chemical calculations provide compelling evidence that product formation requires the initial occupation of a singlet excited state with an anionic azide diradical ligand that is bound to a low-spin d8 -configured PtII ion. Subsequent intersystem crossing generates the Pt-bound triplet azide diradical, which smoothly evolves into the triplet nitrene via N2 loss in a near barrierless adiabatic dissociation. Our data highlight the importance of the productive, N2 -releasing state possessing azide ππ* character as a design principle for accessing efficient N-atom-transfer catalysts.
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Affiliation(s)
- Luis I Domenianni
- Clausius-Institut für Physikalische und Theoretische Chemie, Rheinische Friedrich-Wilhelms-Universität, Wegelerstraße 12, 53115, Bonn, Germany
| | - Markus Bauer
- Clausius-Institut für Physikalische und Theoretische Chemie, Rheinische Friedrich-Wilhelms-Universität, Wegelerstraße 12, 53115, Bonn, Germany
| | - Till Schmidt-Räntsch
- Georg-August-Universität Göttingen, Institut für Anorganische Chemie, Tammannstraße 4, 37077, Göttingen, Germany
| | - Jörg Lindner
- Clausius-Institut für Physikalische und Theoretische Chemie, Rheinische Friedrich-Wilhelms-Universität, Wegelerstraße 12, 53115, Bonn, Germany
| | - Sven Schneider
- Georg-August-Universität Göttingen, Institut für Anorganische Chemie, Tammannstraße 4, 37077, Göttingen, Germany
| | - Peter Vöhringer
- Clausius-Institut für Physikalische und Theoretische Chemie, Rheinische Friedrich-Wilhelms-Universität, Wegelerstraße 12, 53115, Bonn, Germany
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5
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Carsch KM, North SC, DiMucci IM, Iliescu A, Vojáčková P, Khazanov T, Zheng SL, Cundari TR, Lancaster KM, Betley TA. Nitrene transfer from a sterically confined copper nitrenoid dipyrrin complex. Chem Sci 2023; 14:10847-10860. [PMID: 37829016 PMCID: PMC10566472 DOI: 10.1039/d3sc03641c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Accepted: 09/04/2023] [Indexed: 10/14/2023] Open
Abstract
Despite the myriad Cu-catalyzed nitrene transfer methodologies to form new C-N bonds (e.g., amination, aziridination), the critical reaction intermediates have largely eluded direct characterization due to their inherent reactivity. Herein, we report the synthesis of dipyrrin-supported Cu nitrenoid adducts, investigate their spectroscopic features, and probe their nitrene transfer chemistry through detailed mechanistic analyses. Treatment of the dipyrrin CuI complexes with substituted organoazides affords terminally ligated organoazide adducts with minimal activation of the azide unit as evidenced by vibrational spectroscopy and single crystal X-ray diffraction. The Cu nitrenoid, with an electronic structure most consistent with a triplet nitrene adduct of CuI, is accessed following geometric rearrangement of the azide adduct from κ1-N terminal ligation to κ1-N internal ligation with subsequent expulsion of N2. For perfluorinated arylazides, stoichiometric and catalytic C-H amination and aziridination was observed. Mechanistic analysis employing substrate competition reveals an enthalpically-controlled, electrophilic nitrene transfer for primary and secondary C-H bonds. Kinetic analyses for catalytic amination using tetrahydrofuran as a model substrate reveal pseudo-first order kinetics under relevant amination conditions with a first-order dependence on both Cu and organoazide. Activation parameters determined from Eyring analysis (ΔH‡ = 9.2(2) kcal mol-1, ΔS‡ = -42(2) cal mol-1 K-1, ΔG‡298K = 21.7(2) kcal mol-1) and parallel kinetic isotope effect measurements (1.10(2)) are consistent with rate-limiting Cu nitrenoid formation, followed by a proposed stepwise hydrogen-atom abstraction and rapid radical recombination to furnish the resulting C-N bond. The proposed mechanism and experimental analysis are further corroborated by density functional theory calculations. Multiconfigurational calculations provide insight into the electronic structure of the catalytically relevant Cu nitrene intermediates. The findings presented herein will assist in the development of future methodology for Cu-mediated C-N bond forming catalysis.
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Affiliation(s)
- Kurtis M Carsch
- Department of Chemistry and Chemical Biology, Harvard University Cambridge MA 02138 USA
| | - Sasha C North
- Center for Advanced Scientific Computing and Modeling (CASCaM), Department of Chemistry, University of North Texas, Denton TX 76203 USA
| | - Ida M DiMucci
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University Ithaca New York 14853 USA
| | - Andrei Iliescu
- Department of Chemistry and Chemical Biology, Harvard University Cambridge MA 02138 USA
| | - Petra Vojáčková
- Department of Chemistry and Chemical Biology, Harvard University Cambridge MA 02138 USA
| | - Thomas Khazanov
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University Ithaca New York 14853 USA
| | - Shao-Liang Zheng
- Department of Chemistry and Chemical Biology, Harvard University Cambridge MA 02138 USA
| | - Thomas R Cundari
- Center for Advanced Scientific Computing and Modeling (CASCaM), Department of Chemistry, University of North Texas, Denton TX 76203 USA
| | - Kyle M Lancaster
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University Ithaca New York 14853 USA
| | - Theodore A Betley
- Department of Chemistry and Chemical Biology, Harvard University Cambridge MA 02138 USA
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6
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Zars E, Pick L, Swain A, Bhunia M, Carroll PJ, Munz D, Meyer K, Mindiola DJ. Iron-Catalyzed Intermolecular C-H Amination Assisted by an Isolated Iron-Imido Radical Intermediate. Angew Chem Int Ed Engl 2023:e202311749. [PMID: 37815099 DOI: 10.1002/anie.202311749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2023] [Revised: 10/02/2023] [Accepted: 10/03/2023] [Indexed: 10/11/2023]
Abstract
Here we report the use of a base metal complex [(tBu pyrpyrr2 )Fe(OEt2 )] (1-OEt2 ) (tBu pyrpyrr2 2- =3,5-tBu2 -bis(pyrrolyl)pyridine) as a catalyst for intermolecular amination of Csp3 -H bonds of 9,10-dihydroanthracene (2 a) using 2,4,6-trimethyl phenyl azide (3 a) as the nitrene source. The reaction is complete within one hour at 80 °C using as low as 2 mol % 1-OEt2 with control in selectivity for single C-H amination versus double C-H amination. Catalytic C-H amination reactions can be extended to other substrates such as cyclohexadiene and xanthene derivatives and can tolerate a variety of aryl azides having methyl groups in both ortho positions. Under stoichiometric conditions the imido radical species [(tBu pyrpyrr2 )Fe{=N(2,6-Me2 -4-tBu-C6 H2 )] (1-imido) can be isolated in 56 % yield, and spectroscopic, magnetometric, and computational studies confirmed it to be an S = 1 FeIV complex. Complex 1-imido reacts with 2 a to produce the ferrous aniline adduct [(tBu pyrpyrr2 )Fe{NH(2,6-Me2 -4-tBu-C6 H2 )(C14 H11 )}] (1-aniline) in 45 % yield. Lastly, it was found that complexes 1-imido and 1-aniline are both competent intermediates in catalytic intermolecular C-H amination.
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Affiliation(s)
- Ethan Zars
- Department of Chemistry, University of Pennsylvania, 231 S 34th St, Philadelphia, PA-19104, USA
| | - Lisa Pick
- Department of Chemistry & Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen - Nürnberg (FAU), 91058, Erlangen, Germany
| | - Abinash Swain
- Inorganic Chemistry: Coordination Chemistry, Saarland University, Campus C4 1, 66123, Saarbrücken, Germany
| | - Mrinal Bhunia
- Department of Chemistry, University of Pennsylvania, 231 S 34th St, Philadelphia, PA-19104, USA
| | - Patrick J Carroll
- Department of Chemistry, University of Pennsylvania, 231 S 34th St, Philadelphia, PA-19104, USA
| | - Dominik Munz
- Inorganic Chemistry: Coordination Chemistry, Saarland University, Campus C4 1, 66123, Saarbrücken, Germany
| | - Karsten Meyer
- Department of Chemistry & Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen - Nürnberg (FAU), 91058, Erlangen, Germany
| | - Daniel J Mindiola
- Department of Chemistry, University of Pennsylvania, 231 S 34th St, Philadelphia, PA-19104, USA
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7
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Singh R, Bains AK, Kundu A, Jain H, Yadav S, Dey D, Adhikari D. Mechanistic Elucidation of an Alcohol Oxidation Reaction Promoted by a Nickel Azophenolate Complex. Organometallics 2023. [DOI: 10.1021/acs.organomet.2c00667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/18/2023]
Affiliation(s)
- Rahul Singh
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, SAS Nagar 140306, India
| | - Amreen K. Bains
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, SAS Nagar 140306, India
| | - Abhishek Kundu
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, SAS Nagar 140306, India
| | - Harshit Jain
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, SAS Nagar 140306, India
| | - Sudha Yadav
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, SAS Nagar 140306, India
| | - Dhananjay Dey
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, SAS Nagar 140306, India
| | - Debashis Adhikari
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, SAS Nagar 140306, India
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8
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Rodríguez M, M Rodríguez A, López-Resano S, Pericàs MA, Díaz-Requejo MM, Maseras F, Pérez PJ. Non-innocent Role of the Halide Ligand in the Copper-Catalyzed Olefin Aziridination Reaction. ACS Catal 2023; 13:706-713. [PMID: 37808365 PMCID: PMC10552652 DOI: 10.1021/acscatal.2c05069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Revised: 12/05/2022] [Indexed: 12/24/2022]
Abstract
In the context of copper-catalyzed nitrene transfer to olefins, many systems operate upon mixing a CuX salt (X = halide, OTf) and a polydentate N-based ligand, assuming that the X ligand is displaced from the coordination sphere toward a counterion position. Herein, we demonstrated that such general assumption should be in doubt since studies carried out with the well-defined copper(I) complexes (TTM)CuCl and [(TTM)Cu(NCMe)]PF6 (TTM = tris(triazolyl)methane ligand) demonstrate a dual behavior from a catalytic and mechanistic point of view that exclusively depends on the presence or absence of the chloride ligand bonded to the metal center. When coordinated, the turnover-limiting step corresponds to the formation of the carbon-nitrene bond, whereas in its absence, the highest barrier corresponds to the formation of the copper-nitrene intermediate.
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Affiliation(s)
- Manuel
R. Rodríguez
- Laboratorio
de Catálisis Homogénea, Unidad Asociada al CSIC, CIQSO-Centro
de Investigación en Química Sostenible and Departamento
de Química, Universidad de Huelva, 21007 Huelva, Spain
| | - Anabel M Rodríguez
- Laboratorio
de Catálisis Homogénea, Unidad Asociada al CSIC, CIQSO-Centro
de Investigación en Química Sostenible and Departamento
de Química, Universidad de Huelva, 21007 Huelva, Spain
| | - Sara López-Resano
- Institute
of Chemical Research of Catalonia, ICIQ, The Barcelona Institute of
Science and Technology, Av. Països Catalans, 16, 43007 Tarragona, Spain
| | - Miquel A. Pericàs
- Institute
of Chemical Research of Catalonia, ICIQ, The Barcelona Institute of
Science and Technology, Av. Països Catalans, 16, 43007 Tarragona, Spain
| | - M. Mar Díaz-Requejo
- Laboratorio
de Catálisis Homogénea, Unidad Asociada al CSIC, CIQSO-Centro
de Investigación en Química Sostenible and Departamento
de Química, Universidad de Huelva, 21007 Huelva, Spain
| | - Feliu Maseras
- Institute
of Chemical Research of Catalonia, ICIQ, The Barcelona Institute of
Science and Technology, Av. Països Catalans, 16, 43007 Tarragona, Spain
| | - Pedro J. Pérez
- Laboratorio
de Catálisis Homogénea, Unidad Asociada al CSIC, CIQSO-Centro
de Investigación en Química Sostenible and Departamento
de Química, Universidad de Huelva, 21007 Huelva, Spain
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9
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Ji H, Wang Z, Zhan H, Fang Z, Zhang Q, Li D. Copper-catalyzed benzylic C–H amidation of toluene derivatives with N-(8-quinolyl)amides through C(sp3)–H/N–H cross dehydrogenative coupling. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.133066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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10
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Ji H, Zhan H, Chen S, Fang Z, Zhang Q, Li D. Copper‐catalyzed C(sp
3
)−H/N−H Cross Dehydrogenative Coupling Between Toluene Derivatives and Picolinamides. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202200454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Huihui Ji
- New Materials and Green Manufacturing Talent Introduction and Innovation Demonstration Base School of Materials and Chemical Engineering Hubei University of Technology Wuhan 430068 China
| | - Hongju Zhan
- Hubei Provincial Key Laboratory of Drug Synthesis and Optimization Jingchu University of Technology Jingmen 448000 China
| | - Shumin Chen
- Hubei Provincial Key Laboratory of Drug Synthesis and Optimization Jingchu University of Technology Jingmen 448000 China
| | - Zeguo Fang
- New Materials and Green Manufacturing Talent Introduction and Innovation Demonstration Base School of Materials and Chemical Engineering Hubei University of Technology Wuhan 430068 China
| | - Qian Zhang
- New Materials and Green Manufacturing Talent Introduction and Innovation Demonstration Base School of Materials and Chemical Engineering Hubei University of Technology Wuhan 430068 China
| | - Dong Li
- New Materials and Green Manufacturing Talent Introduction and Innovation Demonstration Base School of Materials and Chemical Engineering Hubei University of Technology Wuhan 430068 China
- Hubei Provincial Key Laboratory of Drug Synthesis and Optimization Jingchu University of Technology Jingmen 448000 China
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11
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Pigot C, Brunel D, Dumur F. Indane-1,3-Dione: From Synthetic Strategies to Applications. Molecules 2022; 27:5976. [PMID: 36144711 PMCID: PMC9501146 DOI: 10.3390/molecules27185976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Revised: 09/01/2022] [Accepted: 09/06/2022] [Indexed: 11/26/2022] Open
Abstract
Indane-1,3-dione is a versatile building block used in numerous applications ranging from biosensing, bioactivity, bioimaging to electronics or photopolymerization. In this review, an overview of the different chemical reactions enabling access to this scaffold but also to the most common derivatives of indane-1,3-dione are presented. Parallel to this, the different applications in which indane-1,3-dione-based structures have been used are also presented, evidencing the versatility of this structure.
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Affiliation(s)
- Corentin Pigot
- Aix Marseille Univ, CNRS, ICR, UMR 7273, F-13397 Marseille, France
| | - Damien Brunel
- Aix Marseille Univ, CNRS, ICR, UMR 7273, F-13397 Marseille, France
| | - Frédéric Dumur
- Aix Marseille Univ, CNRS, ICR, UMR 7273, F-13397 Marseille, France
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12
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Xing Q, Jiang D, Zhang J, Guan L, Li T, Zhao Y, Di M, Chen H, Che C, Zhu Z. Combining visible-light induction and copper catalysis for chemo-selective nitrene transfer for late-stage amination of natural products. Commun Chem 2022; 5:79. [PMID: 36697627 PMCID: PMC9814389 DOI: 10.1038/s42004-022-00692-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Accepted: 06/22/2022] [Indexed: 01/28/2023] Open
Abstract
Nitrene transfer chemistry is an effective strategy for introducing C-N bonds, which are ubiquitous in pharmaceuticals, agrochemicals and diverse bioactive natural products. The development of chemical methodology that can functionalize unique sites within natural products through nitrene transfer remains a challenge in the field. Herein, we developed copper catalyzed chemoselective allylic C-H amination and catalyst-free visible-light induced aziridination of alkenes through nitrene transfer. In general, both reactions tolerate a wide range of functional groups and occur with predictable regioselectivity. Furthermore, combination of these two methods enable the intermolecular chemo-selective late-stage amination of biologically active natural products, leading to C-H amination or C=C aziridination products in a tunable way. A series of control experiments indicate two-step radical processes were involved in both reaction systems.
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Affiliation(s)
- Qi Xing
- BayRay Innovation Center, Shenzhen Bay Laboratory, Shenzhen, 518132, China.
| | - Ding Jiang
- BayRay Innovation Center, Shenzhen Bay Laboratory, Shenzhen, 518132, China
| | - Jiayin Zhang
- BayRay Innovation Center, Shenzhen Bay Laboratory, Shenzhen, 518132, China
| | - Liangyu Guan
- BayRay Innovation Center, Shenzhen Bay Laboratory, Shenzhen, 518132, China
| | - Ting Li
- BayRay Innovation Center, Shenzhen Bay Laboratory, Shenzhen, 518132, China
| | - Yi Zhao
- BayRay Innovation Center, Shenzhen Bay Laboratory, Shenzhen, 518132, China
| | - Man Di
- BayRay Innovation Center, Shenzhen Bay Laboratory, Shenzhen, 518132, China
| | - Huangcan Chen
- BayRay Innovation Center, Shenzhen Bay Laboratory, Shenzhen, 518132, China
| | - Chao Che
- BayRay Innovation Center, Shenzhen Bay Laboratory, Shenzhen, 518132, China.
- State Key Laboratory of Chemical Oncogenomics and Key Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School, Shenzhen, 518055, China.
| | - Zhendong Zhu
- BayRay Innovation Center, Shenzhen Bay Laboratory, Shenzhen, 518132, China.
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13
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Rodríguez AM, Pérez-Ruíz J, Molina F, Poveda A, Pérez-Soto R, Maseras F, Díaz-Requejo MM, Pérez PJ. Introducing the Catalytic Amination of Silanes via Nitrene Insertion. J Am Chem Soc 2022; 144:10608-10614. [PMID: 35648453 PMCID: PMC9490852 DOI: 10.1021/jacs.2c03739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
The
direct functionalization
of Si–H bonds by the nitrene
insertion methodology is described. A copper(I) complex bearing a
trispyrazolylborate ligand catalyzes the transfer of a nitrene group
from PhI=NTs to the Si–H bond of silanes, disilanes,
and siloxanes, leading to the exclusive formation of Si–NH
moieties in the first example of this transformation. The process
tolerates other functionalities in the substrate such as several C–H
bonds and alkyne and alkene moieties directly bonded to the silicon
center. Density functional theory (DFT) calculations provide a mechanistic
interpretation consisting of a Si–H homolytic cleavage and
subsequent rebound to the Si-centered radical.
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Affiliation(s)
- Anabel M Rodríguez
- Laboratorio de Catálisis Homogénea, Unidad Asociada al CSIC, CIQSO-Centro de Investigación en Química Sostenible and Departamento de Química, Universidad de Huelva, 21007 Huelva, Spain
| | - Jorge Pérez-Ruíz
- Laboratorio de Catálisis Homogénea, Unidad Asociada al CSIC, CIQSO-Centro de Investigación en Química Sostenible and Departamento de Química, Universidad de Huelva, 21007 Huelva, Spain
| | - Francisco Molina
- Laboratorio de Catálisis Homogénea, Unidad Asociada al CSIC, CIQSO-Centro de Investigación en Química Sostenible and Departamento de Química, Universidad de Huelva, 21007 Huelva, Spain
| | - Ana Poveda
- CICbioGUNE, Basque Research & Technology Alliance (BRTA), Bizkaia Technology Park, Building 800, 48160 Derio, Bizkaia, Spain
| | - Raúl Pérez-Soto
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Avgda. Països Catalans, 16, 43007 Tarragona, Spain
| | - Feliu Maseras
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Avgda. Països Catalans, 16, 43007 Tarragona, Spain
| | - M Mar Díaz-Requejo
- Laboratorio de Catálisis Homogénea, Unidad Asociada al CSIC, CIQSO-Centro de Investigación en Química Sostenible and Departamento de Química, Universidad de Huelva, 21007 Huelva, Spain
| | - Pedro J Pérez
- Laboratorio de Catálisis Homogénea, Unidad Asociada al CSIC, CIQSO-Centro de Investigación en Química Sostenible and Departamento de Química, Universidad de Huelva, 21007 Huelva, Spain
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14
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Schmidt‐Räntsch T, Verplancke H, Lienert JN, Demeshko S, Otte M, Van Trieste GP, Reid KA, Reibenspies JH, Powers DC, Holthausen MC, Schneider S. Nitrogen Atom Transfer Catalysis by Metallonitrene C-H Insertion: Photocatalytic Amidation of Aldehydes. Angew Chem Int Ed Engl 2022; 61:e202115626. [PMID: 34905281 PMCID: PMC9305406 DOI: 10.1002/anie.202115626] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Indexed: 11/18/2022]
Abstract
C-H amination and amidation by catalytic nitrene transfer are well-established and typically proceed via electrophilic attack of nitrenoid intermediates. In contrast, the insertion of (formal) terminal nitride ligands into C-H bonds is much less developed and catalytic nitrogen atom transfer remains unknown. We here report the synthesis of a formal terminal nitride complex of palladium. Photocrystallographic, magnetic, and computational characterization support the assignment as an authentic metallonitrene (Pd-N) with a diradical nitrogen ligand that is singly bonded to PdII . Despite the subvalent nitrene character, selective C-H insertion with aldehydes follows nucleophilic selectivity. Transamidation of the benzamide product is enabled by reaction with N3 SiMe3 . Based on these results, a photocatalytic protocol for aldehyde C-H trimethylsilylamidation was developed that exhibits inverted, nucleophilic selectivity as compared to typical nitrene transfer catalysis. This first example of catalytic C-H nitrogen atom transfer offers facile access to primary amides after deprotection.
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Affiliation(s)
- Till Schmidt‐Räntsch
- Institut für Anorganische ChemieUniversität GöttingenTammannstraße 437077GöttingenGermany
| | - Hendrik Verplancke
- Institut für Anorganische und Analytische ChemieGoethe-UniversitätMax-von-Laue-Straße 760438Frankfurt am MainGermany
| | - Jonas N. Lienert
- Institut für Anorganische und Analytische ChemieGoethe-UniversitätMax-von-Laue-Straße 760438Frankfurt am MainGermany
| | - Serhiy Demeshko
- Institut für Anorganische ChemieUniversität GöttingenTammannstraße 437077GöttingenGermany
| | - Matthias Otte
- Institut für Anorganische ChemieUniversität GöttingenTammannstraße 437077GöttingenGermany
| | | | - Kaleb A. Reid
- Department of ChemistryTexas A&M University3255 TAMUCollege StationTX 77843USA
| | | | - David C. Powers
- Department of ChemistryTexas A&M University3255 TAMUCollege StationTX 77843USA
| | - Max C. Holthausen
- Institut für Anorganische und Analytische ChemieGoethe-UniversitätMax-von-Laue-Straße 760438Frankfurt am MainGermany
| | - Sven Schneider
- Institut für Anorganische ChemieUniversität GöttingenTammannstraße 437077GöttingenGermany
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15
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Fu Y, Zerull EE, Schomaker JM, Liu P. Origins of Catalyst-Controlled Selectivity in Ag-Catalyzed Regiodivergent C-H Amination. J Am Chem Soc 2022; 144:2735-2746. [PMID: 35130697 DOI: 10.1021/jacs.1c12111] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Ag-catalyzed nitrene transfer (NT) converts C-H bonds into valuable C-N bonds. These reactions offer a promising strategy for catalyst-controlled regiodivergent functionalization of different types of reactive C-H bonds, as the regioselectivity is tunable by varying the steric and electronic environments around the Ag nitrene, as well as the identity of the nitrene precursors and the tether length. Therefore, a unified understanding of how these individual factors affect the regioselectivity is key to the rational design of highly selective and regiodivergent C-H amination reactions. Herein, we report a computational study of various Ag-catalyzed NT reactions that indicates a concerted H-atom transfer (HAT)/C-N bond formation mechanism. A detailed analysis was carried out on the effects of the C-H bond dissociation enthalpy (BDE), charge transfer, ligand-substrate steric repulsions, and transition state ring strain on the stability of the C-H insertion transition states with different Ag nitrene complexes. The ancillary ligands on the Ag and the nitrene precursor identity both affect transition state geometries to furnish differing sensitivities to the BDE, tether length, and electronic effects of the reactive C-H bonds. Based on our understanding of the dominant factors that control selectivity, we established a rational catalyst and precursor selection approach for regiodivergent amination of diverse C-H bonds. The computationally predicted regiodivergent amination of β- and γ-C-H bonds of aliphatic alcohol derivatives was validated by experimental studies.
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Affiliation(s)
- Yue Fu
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Emily E Zerull
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, United States
| | - Jennifer M Schomaker
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, United States
| | - Peng Liu
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States.,Department of Chemical and Petroleum Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
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16
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Schmidt‐Räntsch T, Verplancke H, Lienert JN, Demeshko S, Otte M, Van Trieste GP, Reid KA, Reibenspies JH, Powers DC, Holthausen MC, Schneider S. Nitrogen Atom Transfer Catalysis by Metallonitrene C−H Insertion: Photocatalytic Amidation of Aldehydes. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202115626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Till Schmidt‐Räntsch
- Institut für Anorganische Chemie Universität Göttingen Tammannstraße 4 37077 Göttingen Germany
| | - Hendrik Verplancke
- Institut für Anorganische und Analytische Chemie Goethe-Universität Max-von-Laue-Straße 7 60438 Frankfurt am Main Germany
| | - Jonas N. Lienert
- Institut für Anorganische und Analytische Chemie Goethe-Universität Max-von-Laue-Straße 7 60438 Frankfurt am Main Germany
| | - Serhiy Demeshko
- Institut für Anorganische Chemie Universität Göttingen Tammannstraße 4 37077 Göttingen Germany
| | - Matthias Otte
- Institut für Anorganische Chemie Universität Göttingen Tammannstraße 4 37077 Göttingen Germany
| | | | - Kaleb A. Reid
- Department of Chemistry Texas A&M University 3255 TAMU College Station TX 77843 USA
| | | | - David C. Powers
- Department of Chemistry Texas A&M University 3255 TAMU College Station TX 77843 USA
| | - Max C. Holthausen
- Institut für Anorganische und Analytische Chemie Goethe-Universität Max-von-Laue-Straße 7 60438 Frankfurt am Main Germany
| | - Sven Schneider
- Institut für Anorganische Chemie Universität Göttingen Tammannstraße 4 37077 Göttingen Germany
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17
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Wang Z, Yang B, Yang Q, Wang Y. C(sp 3)–H 1,3-diamination of cumene derivatives catalyzed by a dirhodium( ii) catalyst. Org Chem Front 2022. [DOI: 10.1039/d2qo00461e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Using the single-electron oxidation cycle of a dirhodium catalyst, amination can form two primary C–N bonds in a one-step process.
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Affiliation(s)
- Zhifan Wang
- College of Chemistry, Sichuan University, Chengdu, 610041, P.R. China
| | - Beiqi Yang
- College of Chemistry, Sichuan University, Chengdu, 610041, P.R. China
| | - Qi Yang
- College of Chemistry, Sichuan University, Chengdu, 610041, P.R. China
| | - Yuanhua Wang
- College of Chemistry, Sichuan University, Chengdu, 610041, P.R. China
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18
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Van Trieste GP, Reid KA, Hicks MH, Das A, Figgins MT, Bhuvanesh N, Ozarowski A, Telser J, Powers DC. Nitrene Photochemistry of Manganese
N
‐Haloamides**. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202108304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | - Kaleb A. Reid
- Department of Chemistry Texas A&M University College Station TX 77843 USA
| | - Madeline H. Hicks
- Department of Chemistry Texas A&M University College Station TX 77843 USA
| | - Anuvab Das
- Department of Chemistry Texas A&M University College Station TX 77843 USA
| | - Matthew T. Figgins
- Department of Chemistry Texas A&M University College Station TX 77843 USA
| | - Nattamai Bhuvanesh
- Department of Chemistry Texas A&M University College Station TX 77843 USA
| | - Andrew Ozarowski
- National High Magnetic Field Laboratory Florida State University Tallahassee FL 32310 USA
| | - Joshua Telser
- Department of Biological, Physical and Chemical Sciences Roosevelt University Chicago IL 60605 USA
| | - David C. Powers
- Department of Chemistry Texas A&M University College Station TX 77843 USA
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19
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Noda H. Imbuing an Old Heterocycle with the Power of Modern Catalysis: An Isoxazolidin-5-one Story. Chem Pharm Bull (Tokyo) 2021; 69:1160-1169. [PMID: 34853282 DOI: 10.1248/cpb.c21-00750] [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] [Indexed: 11/22/2022]
Abstract
Isoxazolidin-5-ones have been regarded as β-amino acid surrogates owing to their labile N-O bond. While many efforts have been devoted to the catalytic enantioselective synthesis of the core of this heterocycle, its further transformation has been less explored, especially in the context of catalysis. This review summarizes the author's research on the development of catalytic reactions using isoxazolidin-5-ones as substrates. Asymmetric catalysis has proven effective for C-C bond formation at the carbonyl α-carbon. Catalytic asymmetric allylation and direct Mannich-type reactions have been developed. Further, the resulting products have been readily converted into the corresponding quaternary β2,2-amino acids. Moreover, isoxazolidin-5-ones have been identified as alkyl nitrene precursors in the presence of a suitable metal catalyst. The generated metallonitrene undergoes either the electrophilic amination of the aromatic ring or aliphatic C-H insertion, affording a series of cyclic β-amino acids. A remarkable difference in chemoselectivity between rhodium and copper alkyl nitrenes has also been demonstrated, highlighting the unique nature of the underexplored reactive intermediates. The various linear and cyclic β-amino acids obtained through the study are likely to find great utility in a broad range of chemical sciences.
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20
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Afonin MY, Sedelnikova AY, Konokhova AY, Sukhikh TS, Konchenko SN. STRUCTURE AND COMPOSITION OF [(nacnac)MnCl]2 (nacnac = HC(C(Me)N(2.6-i-Pr2C6H3))2) PRODUCTS REDUCED BY POTASSIUM-INTERCALATED GRAPHITE IN TOLUENE AND BENZENE. J STRUCT CHEM+ 2021. [DOI: 10.1134/s0022476621100139] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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21
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Chiral bis(pyrazolyl)methane copper(I) complexes and their application in nitrene transfer reactions. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES 2021. [DOI: 10.1515/znb-2021-0140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
In this study, chiral bis(pyrazolyl)methane copper(I) acetonitrile complexes were applied to generate two novel terminal copper tosyl nitrene complexes with the nitrene generating agent SPhINTs in dichloromethane at low temperatures. The syntheses of the chiral bis(pyrazolyl)methane ligands are based on pulegone and camphor, members of the natural chiral pool. The chiral copper(I) acetonitrile complexes were applied as catalysts in the copper nitrene mediated aziridination reaction of different styrene derivatives and the C–H amination of various substrates. The reactions afforded good yields, but low enantiomeric excess under mild conditions. The nitrene species have been characterized with UV/Vis and EPR spectroscopy and the products of the decay by ESI mass spectrometry.
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22
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Van Trieste GP, Reid KA, Hicks MH, Das A, Figgins MT, Bhuvanesh N, Ozarowski A, Telser J, Powers DC. Nitrene Photochemistry of Manganese N-Haloamides*. Angew Chem Int Ed Engl 2021; 60:26647-26655. [PMID: 34662473 DOI: 10.1002/anie.202108304] [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: 06/22/2021] [Indexed: 11/06/2022]
Abstract
Manganese complexes supported by macrocyclic tetrapyrrole ligands represent an important platform for nitrene transfer catalysis and have been applied to both C-H amination and olefin aziridination catalysis. The reactivity of the transient high-valent Mn nitrenoids that mediate these processes renders characterization of these species challenging. Here we report the synthesis and nitrene transfer photochemistry of a family of MnIII N-haloamide complexes. The S=2 N-haloamide complexes are characterized by 1 H NMR, UV-vis, IR, high-frequency and -field EPR (HFEPR) spectroscopies, and single-crystal X-ray diffraction. Photolysis of these complexes results in the formal transfer of a nitrene equivalent to both C-H bonds, such as the α-C-H bonds of tetrahydrofuran, and olefinic substrates, such as styrene, to afford aminated and aziridinated products, respectively. Low-temperature spectroscopy and analysis of kinetic isotope effects for C-H amination indicate halogen-dependent photoreactivity: Photolysis of N-chloroamides proceeds via initial cleavage of the Mn-N bond to generate MnII and amidyl radical intermediates; in contrast, photolysis of N-iodoamides proceeds via N-I cleavage to generate a MnIV nitrenoid (i.e., {MnNR}7 species). These results establish N-haloamide ligands as viable precursors in the photosynthesis of metal nitrenes and highlight the power of ligand design to provide access to reactive intermediates in group-transfer catalysis.
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Affiliation(s)
| | - Kaleb A Reid
- Department of Chemistry, Texas A&M University, College Station, TX, 77843, USA
| | - Madeline H Hicks
- Department of Chemistry, Texas A&M University, College Station, TX, 77843, USA
| | - Anuvab Das
- Department of Chemistry, Texas A&M University, College Station, TX, 77843, USA
| | - Matthew T Figgins
- Department of Chemistry, Texas A&M University, College Station, TX, 77843, USA
| | - Nattamai Bhuvanesh
- Department of Chemistry, Texas A&M University, College Station, TX, 77843, USA
| | - Andrew Ozarowski
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, 32310, USA
| | - Joshua Telser
- Department of Biological, Physical and Chemical Sciences, Roosevelt University, Chicago, IL, 60605, USA
| | - David C Powers
- Department of Chemistry, Texas A&M University, College Station, TX, 77843, USA
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23
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Han X, Shan LX, Zhu JX, Zhang CS, Zhang XM, Zhang FM, Wang H, Tu YQ, Yang M, Zhang WS. Copper-Nitrene-Catalyzed Desymmetric Oxaziridination/1,2-Alkyl Rearrangement of 1,3-Diketones toward Bicyclic Lactams. Angew Chem Int Ed Engl 2021; 60:22688-22692. [PMID: 34414645 DOI: 10.1002/anie.202107909] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Indexed: 11/08/2022]
Abstract
Although copper-nitrene has been extensively studied as a versatile active species in various transformations, asymmetric reactions involving copper-nitrene have been limited to the aziridination of olefins. Herein, we report the novel copper-nitrene-catalyzed desymmetric oxaziridination reaction of cyclic diketones with alkyl azides and the subsequent rearrangement of the resulting highly active intermediate, which produces a synthetically challenging chiral bicyclic lactam containing a quaternary carbon center. This procedure not only enriches the copper-nitrene-catalyzed asymmetric reactions, but also provides an alternative strategy to address the inherent challenges of catalytic asymmetric Schmidt reactions. This unique reaction could inspire the investigation of novel copper-nitrene-catalyzed asymmetric transformations and their reaction mechanisms.
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Affiliation(s)
- Xue Han
- State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China
| | - Li-Xin Shan
- State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China
| | - Jin-Xin Zhu
- College of Pharmaceutical Science and Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals, Zhejiang University of Technology, Hangzhou, 310014, China
| | - Chang-Sheng Zhang
- State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China
| | - Xiao-Ming Zhang
- State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China
| | - Fu-Min Zhang
- State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China
| | - Hong Wang
- College of Pharmaceutical Science and Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals, Zhejiang University of Technology, Hangzhou, 310014, China
| | - Yong-Qiang Tu
- State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China.,School of Chemistry and Chemical Engineering and Shanghai Key Laboratory of Chiral Medicine Chemistry, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Ming Yang
- State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China
| | - Wen-Shuo Zhang
- State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China
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24
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Han X, Shan L, Zhu J, Zhang C, Zhang X, Zhang F, Wang H, Tu Y, Yang M, Zhang W. Copper‐Nitrene‐Catalyzed Desymmetric Oxaziridination/1,2‐Alkyl Rearrangement of 1,3‐Diketones toward Bicyclic Lactams. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202107909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Xue Han
- State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 China
| | - Li‐Xin Shan
- State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 China
| | - Jin‐Xin Zhu
- College of Pharmaceutical Science and Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals Zhejiang University of Technology Hangzhou 310014 China
| | - Chang‐Sheng Zhang
- State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 China
| | - Xiao‐Ming Zhang
- State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 China
| | - Fu‐Min Zhang
- State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 China
| | - Hong Wang
- College of Pharmaceutical Science and Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals Zhejiang University of Technology Hangzhou 310014 China
| | - Yong‐Qiang Tu
- State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 China
- School of Chemistry and Chemical Engineering and Shanghai Key Laboratory of Chiral Medicine Chemistry Shanghai Jiao Tong University Shanghai 200240 China
| | - Ming Yang
- State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 China
| | - Wen‐Shuo Zhang
- State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 China
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25
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Affiliation(s)
- Hidetoshi Noda
- Institute of Microbial Chemistry 3-14-23 Kamiosaki, Shinagaku-ku Tokyo 141-0021 Japan
| | - Xinxin Tang
- Institute of Microbial Chemistry 3-14-23 Kamiosaki, Shinagaku-ku Tokyo 141-0021 Japan
| | - Masakatsu Shibasaki
- Institute of Microbial Chemistry 3-14-23 Kamiosaki, Shinagaku-ku Tokyo 141-0021 Japan
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26
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Mori-Quiroz LM, Comadoll CG, Super JE, Clift MD. Exploiting Iminoquinones as Electrophilic at Nitrogen "N+" Synthons for C-N Bond Construction. Org Lett 2021; 23:7008-7013. [PMID: 34477395 DOI: 10.1021/acs.orglett.1c00867] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
New methods for C-N bond construction exploiting the N-centered electrophilic character of iminoquinones are reported. Iminoquinones, generated in situ via the condensation of o-vinylanilines with benzoquinones, undergo acid-catalyzed cyclization to afford N-arylindoles in excellent yields. Under similar reaction conditions, homoallylic amines react analogously to afford N-arylpyrroles. Additionally, organometallic nucleophiles are shown to add to the nitrogen atom of N-alkyliminoquinones to provide amine products. Finally, iminoquinones are shown to be competent electrophiles for copper-catalyzed hydroamination.
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Affiliation(s)
- Luis M Mori-Quiroz
- Department of Chemistry, The University of Kansas, 1140 Gray-Little Hall, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - Chelsea G Comadoll
- Department of Chemistry, The University of Kansas, 1140 Gray-Little Hall, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - Jonathan E Super
- Department of Chemistry, The University of Kansas, 1140 Gray-Little Hall, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - Michael D Clift
- Department of Chemistry, The University of Kansas, 1140 Gray-Little Hall, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
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27
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Fuentes MÁ, Gava R, Saper NI, Romero EA, Caballero A, Hartwig JF, Pérez PJ. Copper‐Catalyzed Dehydrogenative Amidation of Light Alkanes. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202104737] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- M. Ángeles Fuentes
- Laboratorio de Catálisis Homogénea Unidad Asociada al CSIC CIQSO-Centro de Investigación en Química Sostenible and Departamento de Química Universidad de Huelva 21007 Huelva Spain
| | - Riccardo Gava
- Laboratorio de Catálisis Homogénea Unidad Asociada al CSIC CIQSO-Centro de Investigación en Química Sostenible and Departamento de Química Universidad de Huelva 21007 Huelva Spain
| | - Noam I. Saper
- Department of Chemistry University of California Berkeley CA 94720 USA
| | - Erik A. Romero
- Department of Chemistry University of California Berkeley CA 94720 USA
| | - Ana Caballero
- Laboratorio de Catálisis Homogénea Unidad Asociada al CSIC CIQSO-Centro de Investigación en Química Sostenible and Departamento de Química Universidad de Huelva 21007 Huelva Spain
| | - John F. Hartwig
- Department of Chemistry University of California Berkeley CA 94720 USA
| | - Pedro J. Pérez
- Laboratorio de Catálisis Homogénea Unidad Asociada al CSIC CIQSO-Centro de Investigación en Química Sostenible and Departamento de Química Universidad de Huelva 21007 Huelva Spain
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28
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Peralta RA, Huxley MT, Albalad J, Sumby CJ, Doonan CJ. Single-Crystal-to-Single-Crystal Transformations of Metal-Organic-Framework-Supported, Site-Isolated Trigonal-Planar Cu(I) Complexes with Labile Ligands. Inorg Chem 2021; 60:11775-11783. [PMID: 34160208 DOI: 10.1021/acs.inorgchem.1c00849] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Transition-metal complexes bearing labile ligands can be difficult to isolate and study in solution because of unwanted dinucleation or ligand substitution reactions. Metal-organic frameworks (MOFs) provide a unique matrix that allows site isolation and stabilization of well-defined transition-metal complexes that may be of importance as moieties for gas adsorption or catalysis. Herein we report the development of an in situ anion metathesis strategy that facilitates the postsynthetic modification of Cu(I) complexes appended to a porous, crystalline MOF. By exchange of coordinated chloride for weakly coordinating anions in the presence of carbon monoxide (CO) or ethylene, a series of labile MOF-appended Cu(I) complexes featuring CO or ethylene ligands are prepared and structurally characterized using X-ray crystallography. These complexes have an uncommon trigonal planar geometry because of the absence of coordinating solvents. The porous host framework allows small and moderately sized molecules to access the isolated Cu(I) sites and displace the "place-holder" CO ligand, mirroring the ligand-exchange processes involved in Cu-centered catalysis.
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Affiliation(s)
- Ricardo A Peralta
- Centre for Advanced Nanomaterials and Department of Chemistry, The University of Adelaide, North Terrace, Adelaide, South Australia 5000, Australia
| | - Michael T Huxley
- Centre for Advanced Nanomaterials and Department of Chemistry, The University of Adelaide, North Terrace, Adelaide, South Australia 5000, Australia
| | - Jorge Albalad
- Centre for Advanced Nanomaterials and Department of Chemistry, The University of Adelaide, North Terrace, Adelaide, South Australia 5000, Australia
| | - Christopher J Sumby
- Centre for Advanced Nanomaterials and Department of Chemistry, The University of Adelaide, North Terrace, Adelaide, South Australia 5000, Australia
| | - Christian J Doonan
- Centre for Advanced Nanomaterials and Department of Chemistry, The University of Adelaide, North Terrace, Adelaide, South Australia 5000, Australia
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Fuentes MÁ, Gava R, Saper NI, Romero EA, Caballero A, Hartwig JF, Pérez PJ. Copper-Catalyzed Dehydrogenative Amidation of Light Alkanes. Angew Chem Int Ed Engl 2021; 60:18467-18471. [PMID: 33979475 PMCID: PMC8457245 DOI: 10.1002/anie.202104737] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Indexed: 01/18/2023]
Abstract
The functionalization of C-H bonds in light alkanes, particularly to form C-N bonds, remains a challenge. We report the dehydrogenative coupling of amides with C1-C4 hydrocarbons to form N-alkyl amide products with tBuOOtBu as oxidant, and a copper complex of a phenanthroline-type ligand as catalyst. The reactions occurred in good yields in benzene or supercritical carbon dioxide as solvents. This strategy allowed for the determination of the relative reactivity of these alkane C-H bonds toward this amination process and showed, in contrast to prior work with larger alkanes, that the reactivity correlated with bond dissociation energies.
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Affiliation(s)
- M Ángeles Fuentes
- Laboratorio de Catálisis Homogénea, Unidad Asociada al CSIC, CIQSO-Centro de Investigación en Química Sostenible and Departamento de Química, Universidad de Huelva, 21007, Huelva, Spain
| | - Riccardo Gava
- Laboratorio de Catálisis Homogénea, Unidad Asociada al CSIC, CIQSO-Centro de Investigación en Química Sostenible and Departamento de Química, Universidad de Huelva, 21007, Huelva, Spain
| | - Noam I Saper
- Department of Chemistry, University of California, Berkeley, CA, 94720, USA
| | - Erik A Romero
- Department of Chemistry, University of California, Berkeley, CA, 94720, USA
| | - Ana Caballero
- Laboratorio de Catálisis Homogénea, Unidad Asociada al CSIC, CIQSO-Centro de Investigación en Química Sostenible and Departamento de Química, Universidad de Huelva, 21007, Huelva, Spain
| | - John F Hartwig
- Department of Chemistry, University of California, Berkeley, CA, 94720, USA
| | - Pedro J Pérez
- Laboratorio de Catálisis Homogénea, Unidad Asociada al CSIC, CIQSO-Centro de Investigación en Química Sostenible and Departamento de Química, Universidad de Huelva, 21007, Huelva, Spain
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30
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Ghosh SK, Hu M, Comito R. One-Pot Synthesis of Primary and Secondary Aliphatic Amines via Mild and Selective sp3 C-H Imination. Chemistry 2021; 27:17601-17608. [PMID: 34387903 DOI: 10.1002/chem.202102627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Indexed: 11/09/2022]
Abstract
The direct replacement of sp3 C-H bonds with simple amine units (-NH2) remains synthetically challenging, although primary aliphatic amines are ubiquitous in medicinal chemistry and natural product synthesis. We report a mild and selective protocol for preparing primary and secondary aliphatic amines in a single pot, based on intermolecular sp3 C-H imination. The first C-H imination of diverse alkanes, this method shows useful site-selectivity within substrates bearing multiple sp3 C-H bonds. Furthermore, this reaction tolerates polar functional groups relevant for complex molecule synthesis, highlighted in the synthesis of amine pharmaceuticals and amination of natural products. We characterize a unique C-H imination mechanism based on radical rebound to an iminyl radical, supported by kinetic isotope effects, stereoablation, resubmission, and computational modeling. This work constitutes a selective method for complex amine synthesis and a new mechanistic platform for C-H amination.
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Affiliation(s)
- Subrata K Ghosh
- University of Houston, Chemistry, Department of Chemistry, 3585 Cullen Boulevard, Room 112, 77204-5003, Houston, UNITED STATES
| | - Mengnan Hu
- University of Houston, Chemistry, Department of Chemistry, 3585 Cullen Boulevard, Room 112, 77204-5003, Houstonn, UNITED STATES
| | - Robert Comito
- University of Houston, Chemistry, Department of Chemistry, 3585 Cullen Boulevard, Room 112, 77204-5003, Houston, UNITED STATES
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31
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Aguilar-Calderón JR, Fehn D, Sorsche D, Miehlich M, Carroll PJ, Zars E, Meyer K, Mindiola DJ. Redox-Controlled and Reversible N-N Bond Forming and Splitting with an Iron IV Terminal Imido Ligand. Inorg Chem 2021; 60:13091-13100. [PMID: 34375089 DOI: 10.1021/acs.inorgchem.1c01509] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Oxidation of the low-spin FeIV imido complex [{(tBupyrr)2py}Fe═NAd] (1) ((tBupyrr)2py2- = 2,6-bis(3,5-di-tert-butyl-pyrrolyl)pyridine, Ad = 1-adamantyl) with AgOAc or AgNO3 promotes reductive N-N bond coupling of the former imido nitrogen with a pyrrole nitrogen to form the respective ferric hydrazido-like pincer complexes [{(tBupyrrNAd)(tBupyrr)py}Fe(κ2-X)] (X = OAc-, 2OAc; NO3-, 2NO3). Reduction of 2OAc with KC8 cleaves the N-N bond to reform the FeIV imido ligand in 1, whereas acid-mediated demetalation of 2OAc or 2NO3 yields the free hydrazine ligand [(tBupyrrNHAd)(tBupyrrH)py] (3), the latter of which can be used as a direct entry to the iron imido complex when treated with [Fe{N(SiMe3)2}2]. In addition to characterizing these Fe systems, we show how this nitrene transfer strategy can be expanded to Co for the one-step synthesis of Co{(tBu-NHAdpyrr)(tBupyrr)py}] (4) ((tBu-NHAdpyrr)(tBupyrr)py2- = 2-(3-tBu-5-(1-adamantylmethyl-2-methylpropane-2-yl)-pyrrol-2-yl)-6-(3,5-tBu2-pyrrol-2-yl)-pyridine).
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Affiliation(s)
| | - Dominik Fehn
- Inorganic Chemistry, Department of Chemistry and Pharmacy, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), 91058 Erlangen, Germany
| | - Dieter Sorsche
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Matthias Miehlich
- Inorganic Chemistry, Department of Chemistry and Pharmacy, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), 91058 Erlangen, Germany
| | - Patrick J Carroll
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Ethan Zars
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Karsten Meyer
- Inorganic Chemistry, Department of Chemistry and Pharmacy, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), 91058 Erlangen, Germany
| | - Daniel J Mindiola
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
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Mao W, Fehn D, Heinemann FW, Scheurer A, Munz D, Meyer K. A Pair of Cobalt(III/IV) Terminal Imido Complexes. Angew Chem Int Ed Engl 2021; 60:16480-16486. [PMID: 33847448 PMCID: PMC8362208 DOI: 10.1002/anie.202103170] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Revised: 03/29/2021] [Indexed: 12/16/2022]
Abstract
The reaction of the cobalt(I) complex [(TIMMNmes )CoI ](BPh4 ) (2) (TIMMNmes =tris-[2-(3-mesitylimidazolin-2-ylidene)methyl]amine) with 1-adamantylazide yields the cobalt(III) imido complex [(TIMMNmes )CoIII (NAd)](BPh4 ) (3) with concomitant release of dinitrogen. The N-anchor in diamagnetic 3 features an unusual, planar tertiary amine, which results from repulsive electrostatic interaction with the filled d(z2 )-orbital of the cobalt ion and negative hyperconjugation with the neighboring methylene groups. One-electron oxidation of 3 with [FeCp2 ](OTf) provides access to the rare, high-valent cobalt(IV) imido complex [(TIMMNmes )CoIV (NAd)](OTf)2 (4). Despite a half-life of less than 1 h at room temperature, 4 could be isolated at low temperatures in analytically pure form. Single-crystal X-ray diffractometry and EPR spectroscopy corroborate the molecular structure and the d5 low-spin, S= 1 / 2 , electron configuration. A computational analysis of 4 suggests high covalency within the CoIV =NAd bond with non-negligible spin density located at the imido moiety, which translates into substantial triplet nitrene character.
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Affiliation(s)
- Weiqing Mao
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)Inorganic ChemistryEgerlandstrasse 191058ErlangenGermany
| | - Dominik Fehn
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)Inorganic ChemistryEgerlandstrasse 191058ErlangenGermany
| | - Frank W. Heinemann
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)Inorganic ChemistryEgerlandstrasse 191058ErlangenGermany
| | - Andreas Scheurer
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)Inorganic ChemistryEgerlandstrasse 191058ErlangenGermany
| | - Dominik Munz
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)Inorganic ChemistryEgerlandstrasse 191058ErlangenGermany
- Current address: Saarland UniversityInorganic Chemistry: Coordination ChemistryCampus C4.166123SaarbrückenGermany
| | - Karsten Meyer
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)Inorganic ChemistryEgerlandstrasse 191058ErlangenGermany
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33
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Ghosh M, Khan S. N-Heterocyclic silylenes in coinage metal chemistry: an account of recent advances. Dalton Trans 2021; 50:10674-10688. [PMID: 34236058 DOI: 10.1039/d1dt01955d] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This article intends to highlight and comprehensively summarize the recent developments in the field of silylene-coinage metal chemistry. Recent years have witnessed exponential growth in the utilization of N-heterocyclic silylenes as ligands in transition metal chemistry. Still, silylene-coinage metal complexes have only started to appear very recently. Particular attention is focused on the synthetic approaches to silylene-coinage metal complexes and their unusual properties derived from the spectroscopic and crystallographic data. Recent studies have demonstrated that silylene-coinage metal complexes exhibit catalytic efficiency towards hydrosilylation, copper-catalyzed alkyne azide cycloaddition (CuAAC), and glycosidation reactions. Although the chemistry of silylene-coinage metal complexes has only begun to blossom, these findings justify the need for a review at this stage of development. This article will summarize the previous work on silylene-coinage metal complexes followed by recent advances and conclude with future possibilities.
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Affiliation(s)
- Moushakhi Ghosh
- Department of Chemistry, Indian Institute of Science Education and Research Pune, Dr Homi Bhaba Road, Pashan, Pune, 411008, India.
| | - Shabana Khan
- Department of Chemistry, Indian Institute of Science Education and Research Pune, Dr Homi Bhaba Road, Pashan, Pune, 411008, India.
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34
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Mao W, Fehn D, Heinemann FW, Scheurer A, Munz D, Meyer K. A Pair of Cobalt(III/IV) Terminal Imido Complexes. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202103170] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Weiqing Mao
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Inorganic Chemistry Egerlandstrasse 1 91058 Erlangen Germany
| | - Dominik Fehn
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Inorganic Chemistry Egerlandstrasse 1 91058 Erlangen Germany
| | - Frank W. Heinemann
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Inorganic Chemistry Egerlandstrasse 1 91058 Erlangen Germany
| | - Andreas Scheurer
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Inorganic Chemistry Egerlandstrasse 1 91058 Erlangen Germany
| | - Dominik Munz
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Inorganic Chemistry Egerlandstrasse 1 91058 Erlangen Germany
- Current address: Saarland University Inorganic Chemistry: Coordination Chemistry Campus C4.1 66123 Saarbrücken Germany
| | - Karsten Meyer
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Inorganic Chemistry Egerlandstrasse 1 91058 Erlangen Germany
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35
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Warm K, Monte Pérez I, Kuhlmann U, Hildebrandt P, Farquhar E, Swart M, Ray K. Stable, but still reactive – investigations on the effects of Lewis acid binding on copper nitrene intermediates. Z Anorg Allg Chem 2021. [DOI: 10.1002/zaac.202100092] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Katrin Warm
- Institut für Chemie Humboldt-Universität zu Berlin Brook-Taylor-Straße 2 12489 Berlin Germany
| | - Inés Monte Pérez
- Institut für Chemie Humboldt-Universität zu Berlin Brook-Taylor-Straße 2 12489 Berlin Germany
| | - Uwe Kuhlmann
- Institut für Chemie Technische Universität Berlin Fakultät II Straße des 17. Juni 135 10623 Berlin Germany
| | - Peter Hildebrandt
- Institut für Chemie Technische Universität Berlin Fakultät II Straße des 17. Juni 135 10623 Berlin Germany
| | - Erik Farquhar
- Brookhaven National Laboratory NSLS-II, Bldg. 745, Room 106, P.O. Box 5000 11973-5000 Upton NY United States
| | - Marcel Swart
- Institut de Química Computacional i Catàlisi Universitat de Girona Campus Montilivi (Ciències) Maria Aurèlia Capmany i Farnés, 69 17003 Girona, ICREA and Pg. Lluís Companys 23 08010 Barcelona Spain
| | - Kallol Ray
- Institut für Chemie Humboldt-Universität zu Berlin Brook-Taylor-Straße 2 12489 Berlin Germany
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36
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Thomas F, Oster M, Schön F, Göbgen KC, Amarouch B, Steden D, Hoffmann A, Herres-Pawlis S. A new generation of terminal copper nitrenes and their application in aromatic C-H amination reactions. Dalton Trans 2021; 50:6444-6462. [PMID: 33908532 DOI: 10.1039/d1dt00832c] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Copper nitrene complexes are highly reactive species and are known as intermediates in the copper catalyzed C-H amination. In this study, three novel copper tosyl nitrene complexes were synthesized at low temperatures, stabilized with heteroscorpionate ligands of the bis(pyrazolyl)methane family. The copper nitrenes were obtained by the reaction of a copper(i) acetonitrile complex with SPhINTs in dichloromethane. We show that the ligand design has a major influence on the catalytic activity and the thermal stability of the copper nitrene complex. Not only the choice of the third N donor, but also the substituent in the 5-position of the pyrazolyl moiety, have an impact on the stability. Furthermore, the novel copper nitrene complexes were used for catalytic aziridination of styrenes and C-H amination reactions of aromatic and aliphatic substrates under mild reaction conditions. Even challenging substrates like benzene and cyclohexane were aminated with good yields. The copper nitrene complexes were characterized using UV/Vis spectroscopy, low temperature Evans NMR spectroscopy, density functional theory, domain-based local pair natural orbital coupled cluster calculations (DLPNO-CCSD(T)) and cryo-UHR mass spectrometry.
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Affiliation(s)
- Fabian Thomas
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1a, 52074 Aachen, Germany.
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37
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Desnoyer AN, Nicolay A, Ziegler MS, Lakshmi KV, Cundari TR, Tilley TD. A Dicopper Nitrenoid by Oxidation of a Cu ICu I Core: Synthesis, Electronic Structure, and Reactivity. J Am Chem Soc 2021; 143:7135-7143. [PMID: 33877827 DOI: 10.1021/jacs.1c02235] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A dicopper nitrenoid complex was prepared by formal oxidative addition of the nitrenoid fragment to a dicopper(I) center by reaction with the iminoiodinane PhINTs (Ts = tosylate). This nitrenoid complex, (DPFN)Cu2(μ-NTs)[NTf2]2 (DPFN = 2,7-bis(fluorodi(2-pyridyl)methyl)-1,8-naphthyridine), is a powerful H atom abstractor that reacts with a range of strong C-H bonds to form a mixed-valence Cu(I)/Cu(II) μ-NHTs amido complex in the first example of a clean H atom transfer to a dicopper nitrenoid core. In line with this reactivity, DFT calculations reveal that the nitrenoid is best described as an iminyl (NR radical anion) complex. The nitrenoid was trapped by the addition of water to form a mixed-donor hydroxo/amido dicopper(II) complex, which was independently obtained by reaction of a Cu2(μ-OH)2 complex with an amine through a protonolysis pathway. This mixed-donor complex is an analogue for the proposed intermediate in copper-catalyzed Chan-Evans-Lam coupling, which proceeds via C-X (X = N or O) bond formation. Treatment of the dicopper(II) mixed donor complex with MgPh2(THF)2 resulted in generation of a mixture that includes both phenol and a previously reported dicopper(I) bridging phenyl complex, illustrating that both reduction of dicopper(II) to dicopper(I) and concomitant C-X bond formation are feasible.
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Affiliation(s)
- Addison N Desnoyer
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720-1460, United States.,Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Amélie Nicolay
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720-1460, United States.,Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Micah S Ziegler
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720-1460, United States.,Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - K V Lakshmi
- Department of Chemistry and Chemical Biology and The Baruch '60 Center for Biochemical Solar Energy, Research, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Thomas R Cundari
- Department of Chemistry, Center for Advanced Scientific Computing and Modeling (CASCaM), University of North Texas, Denton, Texas 76203, United States
| | - T Don Tilley
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720-1460, United States.,Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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38
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Fu X, Zhao Q, Zhao W. Synthesis of β‐Alkoxy Amines from Alkenes, Sulfonyl Azides, and Alcohols though Copper‐Catalyzed Three‐Component Tandem Reactions via Regioselective Ring‐Opening of Aziridine Intermediates. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100087] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Xiao‐Fei Fu
- College of Chemistry and Chemical Engineering Shangqiu Normal University Shangqiu 476000 P. R. China
- College of Chemistry Zhengzhou University Zhengzhou 450001 P. R. China
| | - Qiang Zhao
- Department of Chemistry Purdue University West Lafayette Indiana 47907 United States
| | - Wen‐Xian Zhao
- College of Chemistry and Chemical Engineering Shangqiu Normal University Shangqiu 476000 P. R. China
- College of Chemistry Zhengzhou University Zhengzhou 450001 P. R. China
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39
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Tak RK, Amemiya F, Noda H, Shibasaki M. Generation and application of Cu-bound alkyl nitrenes for the catalyst-controlled synthesis of cyclic β-amino acids. Chem Sci 2021; 12:7809-7817. [PMID: 34168835 PMCID: PMC8188474 DOI: 10.1039/d1sc01419f] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Accepted: 04/24/2021] [Indexed: 12/20/2022] Open
Abstract
The advent of saturated N-heterocycles as valuable building blocks in medicinal chemistry has led to the development of new methods to construct such nitrogen-containing cyclic frameworks. Despite the apparent strategic clarity, intramolecular C-H aminations with metallonitrenes have only sporadically been explored in this direction because of the intractability of the requisite alkyl nitrenes. Here, we report copper-catalysed intramolecular amination using an alkyl nitrene generated from substituted isoxazolidin-5-ones upon N-O bond cleavage. The copper catalysis exclusively aminates aromatic C(sp2)-H bonds among other potentially reactive groups, offering a solution to the chemoselectivity problem that has been troublesome with rhodium catalysis. A combined experimental and computational study suggested that the active species in the current cyclic β-amino acid synthesis is a dicopper alkyl nitrene, which follows a cyclisation pathway distinct from the analogous alkyl metallonitrene.
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Affiliation(s)
- Raj K Tak
- Institute of Microbial Chemistry (BIKAKEN) Tokyo3-14-23 Kamiosaki, Shinagawa-ku Tokyo 141-0021 Japan
| | - Fuyuki Amemiya
- Institute of Microbial Chemistry (BIKAKEN) Tokyo3-14-23 Kamiosaki, Shinagawa-ku Tokyo 141-0021 Japan
| | - Hidetoshi Noda
- Institute of Microbial Chemistry (BIKAKEN) Tokyo3-14-23 Kamiosaki, Shinagawa-ku Tokyo 141-0021 Japan
| | - Masakatsu Shibasaki
- Institute of Microbial Chemistry (BIKAKEN) Tokyo3-14-23 Kamiosaki, Shinagawa-ku Tokyo 141-0021 Japan
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40
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Grant LN, Bhunia M, Pinter B, Rebreyend C, Carroll ME, Carroll PJ, de Bruin B, Mindiola DJ. Pursuit of an Electron Deficient Titanium Nitride. Inorg Chem 2021; 60:5635-5646. [PMID: 33825450 DOI: 10.1021/acs.inorgchem.0c03644] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The nitride salt [(PN)2Ti≡N{μ2-K(OEt2)}]2 (1) (PN- = (N-(2-PiPr2-4-methylphenyl)-2,4,6-Me3C6H2) can be oxidized with two equiv of I2 or four equiv of ClCPh3 to produce the phosphinimide-halide complexes (NPN')(PN)Ti(X) (X- = I (2), Cl (3); NPN' = N-(2-NPiPr2-4-methylphenyl)-2,4,6-Me3C6H22-), respectively. In the case of 2, H2 was found to be one of the other products; whereas, HCPh3 and Gomberg's dimer were observed upon the formation of 3. Independent studies suggest that the oxidation of 1 could imply the formation of the transient nitridyl species [(PN)2Ti(≡N•)] (A), which can either oxidize the proximal phosphine atom to produce the Ti(III) intermediate [(NPN')(PN)Ti] (B) or, alternatively, engage in H atom abstraction to form the parent imido (PN)2Ti≡NH (4). The latter was independently prepared and was found to photochemically convert to the titanium-hydride, (NPN')(PN)Ti(H) (5). Isotopic labeling studies using (PN)2Ti≡ND (4-d1) as well as reactivity studies of 5 with a hydride abstractor demonstrate the presence of the hydride ligand in 5. An alternative route to putative A was observed via a photochemically promoted incomplete reduction of the azide ligand in (PN)2Ti(N3) (6) to 4. This process was accompanied by some formation of 5. Frozen matrix X-band EPR studies of 6, performed under photolytic conditions, were consistent with species B being formed under these reaction conditions, originating from a low barrier N-insertion into the phosphine group in the putative nitridyl species A. Computational studies were also undertaken to discover the mechanism and plausibility of the divergent pathways (via intermediates A and B) in the formation of 2 and 3, and to characterize the bonding and electronic structure of the elusive nitrogen-centered radical in A.
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Affiliation(s)
- Lauren N Grant
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Mrinal Bhunia
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Balazs Pinter
- Department of Chemistry, Universidad Técnica Federico Santa María, Valparaíso 2390123, Chile
| | - Christophe Rebreyend
- Department of Homogeneous Catalysis, Universiteit van Amsterdam, Faculty of Science, van 't Hoff Institute for Molecular Sciences, Postbus 94720, Amsterdam
| | - Maria E Carroll
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Patrick J Carroll
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Bas de Bruin
- Department of Homogeneous Catalysis, Universiteit van Amsterdam, Faculty of Science, van 't Hoff Institute for Molecular Sciences, Postbus 94720, Amsterdam
| | - Daniel J Mindiola
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
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Yu F, Zhou Z, Song J, Zhao Y. DFT and AFIR study on the copper(i)-catalyzed mechanism of 5-enamine-trisubstituted-1,2,3-triazole synthesis via C-N cross-coupling and the origin of ring-opening of 2 H-azirines. RSC Adv 2021; 11:2744-2755. [PMID: 35424213 PMCID: PMC8693862 DOI: 10.1039/d0ra07498e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Accepted: 12/03/2020] [Indexed: 12/04/2022] Open
Abstract
Understanding the synthesis mechanism of substituted 1,2,3-triazoles is an important and state-of-the-art research area of contemporary copper(i)-catalyzed terminal alkyne and organic azide click reaction (CuAAC), which has invoked increasing close collaborations between experiment and theory including copper catalyzed interrupted click reaction. In this study, the mechanism of Cu(i)-catalyzed 5-enamine-functionalized fully substituted 1,2,3-triazole synthesis was rationalized via density functional theory (DFT) and multicomponent artificial force-induced reaction (MC-AFIR) methods. The reasonable reaction route consists of (a) di-copper catalyzed ring-opening of 2H-azirines, (b) alkyne hydrogen atom transfer, (c) [3 + 2] ring cycloaddition, and (d) C-N bond formation through reductive elimination. The MC-AFIR method was used for the systematic determination of transition states for the C/N-Cu bond formation, C-N bond coupling and crossing points between singlet and triplet states. Our survey on the prereactant complexes suggested that the dicopper-catalyzed 2H-azirine ring-opening and alkyne hydrogen activation are both thermodynamically feasible via a singlet/triplet crossing point. This explains why Et3N is critical for alkyne hydrogen transfer (HT) before the [3 + 2] cycloaddition reaction, and the C-N cross-coupling product instead of the click product (byproduct). Our DFT results indicate that the transmetalation process is the rate determination step along the triplet state potential energy surface. This study provides important mechanistic insights for the interrupted CuAAC reaction to form 5-enamine-fully-substituted-1,2,3-triazoles. Further insight prediction interprets that solvent and extra strong ligand coordination play a certain role in competitive reactions.
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Affiliation(s)
- Fan Yu
- Department of Chemistry, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University Hangzhou 310018 China
| | - Zhaoman Zhou
- Department of Chemistry, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University Hangzhou 310018 China
| | - Jiajia Song
- Department of Chemistry, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University Hangzhou 310018 China
| | - Yanying Zhao
- Department of Chemistry, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University Hangzhou 310018 China
- State Key Laboratory of Advanced Textiles Materials and Manufacture Technology, Ministry of Education, Zhejiang Sci-Tech University Hangzhou 310018 China
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42
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Shao Z, Wang F, Shi J, Ma L, Li Z. Synergetic copper/TEMPO-catalysed benzylic C–H imidation with N-fluorobenzenesulfonimide at room temperature and tandem conversions with alcohols or arenes. Org Chem Front 2021. [DOI: 10.1039/d1qo00340b] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
A remote carbamate-directed benzylic C–H imidation with NFSI at room temperature through synergetic CuCl-TEMPO catalysis and tandem alkoxylation or arylation with alcohols or arenes are described.
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Affiliation(s)
- Zhong Shao
- Department of Pharmaceutical and Biological Engineering
- School of Chemical Engineering
- Sichuan University
- Chengdu 610065
- China
| | - Fang Wang
- Department of Pharmaceutical and Biological Engineering
- School of Chemical Engineering
- Sichuan University
- Chengdu 610065
- China
| | - Jingqi Shi
- Department of Pharmaceutical and Biological Engineering
- School of Chemical Engineering
- Sichuan University
- Chengdu 610065
- China
| | - Lifang Ma
- Department of Pharmaceutical and Biological Engineering
- School of Chemical Engineering
- Sichuan University
- Chengdu 610065
- China
| | - Ziyuan Li
- Department of Pharmaceutical and Biological Engineering
- School of Chemical Engineering
- Sichuan University
- Chengdu 610065
- China
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43
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Casey KC, Appiah JK, Robinson JR. Low-Symmetry β-Diketimine Aryloxide Rare-Earth Complexes: Flexible, Reactive, and Selective. Inorg Chem 2020; 59:14827-14837. [PMID: 32986427 DOI: 10.1021/acs.inorgchem.0c02170] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
We report the synthesis, characterization, and reactivity of a new low-symmetry β-diketimine featuring a pendant amino(methyl)phenol donor and its corresponding heteroleptic rare-earth (RE) complexes. This includes the first structurally characterized examples of alcoholysis and insertion from an isolated REIII amide in a β-diketimine framework. The flexible methylene linkage leads to REIII complexes with tunable dynamic solution behavior that defines their stoichiometric and catalytic reactivity. The addition of a strong neutral donor ligand, tricyclohexylphosphine oxide, suppresses a prevalent catalyst degradation pathway (base-promoted elimination) and dramatically enhances the catalyst performance in the stereospecific ring-opening polymerization of rac-β-butyrolactone. Our results further demonstrate the importance of ligand reorganization in the stoichiometric and catalytic activity of REIII ions.
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Affiliation(s)
- Kerry C Casey
- Department of Chemistry, Brown University, 324 Brook Street, Providence, Rhode Island 02912, United States
| | - Jude K Appiah
- Department of Chemistry, Brown University, 324 Brook Street, Providence, Rhode Island 02912, United States
| | - Jerome R Robinson
- Department of Chemistry, Brown University, 324 Brook Street, Providence, Rhode Island 02912, United States
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44
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Wu Y, Chen K, Ge X, Ma P, Xu Z, Lu H, Li G. Redox-Neutral P(O)-N Coupling between P(O)-H Compounds and Azides via Dual Copper and Photoredox Catalysis. Org Lett 2020; 22:6143-6149. [PMID: 32649207 DOI: 10.1021/acs.orglett.0c02207] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
We report a redox-neutral P(O)-N coupling reaction of P(O)-H compounds with azides via photoredox and copper catalysis, providing new access to useful phosphinamides, phosphonamides, and phosphoramides. This transformation tolerates a wide range of nucleophilic functionalities including alcohol and amine nucleophiles, which makes up for the deficiency of classical nitrogen nucleophilic substitution reactions. As a demonstration of the broad potential applications of this new methodology, late-stage functionalization of a diverse array of azido-bearing natural products and drug molecules, a preliminary asymmetric reaction, and a continuous visible-light photoflow process have been developed.
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Affiliation(s)
- Yanan Wu
- Institute of Chemistry and BioMedical Sciences, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China
| | - Ken Chen
- Institute of Chemistry and BioMedical Sciences, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China
| | - Xia Ge
- Institute of Chemistry and BioMedical Sciences, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China
| | - Panpan Ma
- Institute of Chemistry and BioMedical Sciences, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China
| | - Zhiyuan Xu
- Institute of Chemistry and BioMedical Sciences, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China
| | - Hongjian Lu
- Institute of Chemistry and BioMedical Sciences, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China
| | - Guigen Li
- Institute of Chemistry and BioMedical Sciences, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China.,Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, United States
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45
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Xie Z, Zhou F, Ding K. Copper‐Mediated Diamination of Arylboronic Acids for the Synthesis of 2‐Aryl Benzimidazoles Using Trimethylsilyl Azide as the Amino Sources with Aldehydes. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000385] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Zeqiang Xie
- International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Discovery of Chinese Ministry of Education (MOE)Guangzhou City Key Laboratory of Precision Chemical Drug DevelopmentSchool of PharmacyJinan University 601 Huangpu Avenue West Guangzhou 510632 People's Republic of China
| | - Fengtao Zhou
- International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Discovery of Chinese Ministry of Education (MOE)Guangzhou City Key Laboratory of Precision Chemical Drug DevelopmentSchool of PharmacyJinan University 601 Huangpu Avenue West Guangzhou 510632 People's Republic of China
| | - Ke Ding
- International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Discovery of Chinese Ministry of Education (MOE)Guangzhou City Key Laboratory of Precision Chemical Drug DevelopmentSchool of PharmacyJinan University 601 Huangpu Avenue West Guangzhou 510632 People's Republic of China
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47
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Bakhoda AG, Wiese S, Greene C, Figula BC, Bertke JA, Warren TH. Radical Capture at Nickel(II) Complexes: C–C, C–N, and C–O Bond Formation. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00021] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Abolghasem Gus Bakhoda
- Georgetown University, Department of Chemistry, Washington, District of Columbia 20057-1227, United States
| | - Stefan Wiese
- Georgetown University, Department of Chemistry, Washington, District of Columbia 20057-1227, United States
| | - Christine Greene
- Georgetown University, Department of Chemistry, Washington, District of Columbia 20057-1227, United States
| | - Bryan C. Figula
- Georgetown University, Department of Chemistry, Washington, District of Columbia 20057-1227, United States
| | - Jeffery A. Bertke
- Georgetown University, Department of Chemistry, Washington, District of Columbia 20057-1227, United States
| | - Timothy H. Warren
- Georgetown University, Department of Chemistry, Washington, District of Columbia 20057-1227, United States
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48
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Shing KP, Wan Q, Chang XY, Che CM. The first crystallographically characterised ruthenium(vi) alkylimido porphyrin competent for aerobic epoxidation and hydrogen atom abstraction. Chem Commun (Camb) 2020; 56:4428-4431. [PMID: 32195498 DOI: 10.1039/c9cc09972g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The syntheses of [RuVI(Por)(NAd)(O)] and [RuVI(2,6-F2-TPP)(NAd)2] have been described. [RuVI(2,6-F2-TPP)(NAd)(O)] capable of catalysing aerobic epoxidation of alkenes has been characterised by X-ray crystallography with Ru[double bond, length as m-dash]NAd and Ru[double bond, length as m-dash]O bond distances being 1.778(5) Å and 1.760(4) Å (∠O-Ru-NAd: 174.37(19)°), respectively. Its first reduction potential is 740 mV cathodically shifted from that of [RuVI(2,6-F2-TPP)(O)2].
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Affiliation(s)
- Ka-Pan Shing
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, China.
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49
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Bower JK, Cypcar AD, Henriquez B, Stieber SCE, Zhang S. C(sp 3)-H Fluorination with a Copper(II)/(III) Redox Couple. J Am Chem Soc 2020; 142:8514-8521. [PMID: 32275410 DOI: 10.1021/jacs.0c02583] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Despite the growing interest in the synthesis of fluorinated organic compounds, few reactions are able to incorporate fluoride ions directly into alkyl C-H bonds. Here, we report the C(sp3)-H fluorination reactivity of a formally copper(III) fluoride complex. The C-H fluorination intermediate, LCuF, along with its chloride and bromide analogues, LCuCl and LCuBr, were prepared directly from halide sources with a chemical oxidant and fully characterized with single-crystal X-ray diffraction, X-ray absorption spectroscopy, UV-vis spectroscopy, and 1H nuclear magnetic resonance spectroscopy. Quantum chemical calculations reveal significant halide radical character for all complexes, suggesting their ability to initiate and terminate a C(sp3)-H halogenation sequence by sequential hydrogen atom abstraction (HAA) and radical capture. The capability of HAA by the formally copper(III) halide complexes was explored with 9,10-dihydroanthracene, revealing that LCuF exhibits rates 2 orders of magnitude higher than LCuCl and LCuBr. In contrast, all three complexes efficiently capture carbon radicals to afford C(sp3)-halogen bonds. Mechanistic investigation of radical capture with a triphenylmethyl radical revealed that LCuF proceeds through a concerted mechanism, while LCuCl and LCuBr follow a stepwise electron transfer-halide transfer pathway. The capability of LCuF to perform both hydrogen atom abstraction and radical capture was leveraged to enable fluorination of allylic and benzylic C-H bonds and α-C-H bonds of ethers at room temperature.
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Affiliation(s)
- Jamey K Bower
- Department of Chemistry & Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Andrew D Cypcar
- Department of Chemistry & Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Brenda Henriquez
- Department of Chemistry & Biochemistry, California State Polytechnic University, Pomona, 3801 West Temple Avenue, Pomona, California 91768, United States
| | - S Chantal E Stieber
- Department of Chemistry & Biochemistry, California State Polytechnic University, Pomona, 3801 West Temple Avenue, Pomona, California 91768, United States
| | - Shiyu Zhang
- Department of Chemistry & Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
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50
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Affiliation(s)
- Anuvab Das
- Department of Chemistry, Texas A&M University, College Station, Texas, USA
| | | | - David C. Powers
- Department of Chemistry, Texas A&M University, College Station, Texas, USA
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