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Liang S, Jensen MP. [Fe(NCMe) 6](BF 4) 2 is a bifunctional catalyst for styrene aziridination by nitrene transfer and heterocycle expansion by subsequent dipolar insertion. J Inorg Biochem 2024; 256:112551. [PMID: 38678911 DOI: 10.1016/j.jinorgbio.2024.112551] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2024] [Revised: 03/24/2024] [Accepted: 04/04/2024] [Indexed: 05/01/2024]
Abstract
The solvated iron(II) salt [Fe(NCMe)6](BF4)2 (Me = methyl) is shown to be a bifunctional catalyst with respect to aziridination of styrene. The salt serves as an active catalyst for nitrene transfer from PhINTs to styrene to form 2-phenyl-N-tosylaziridine (Ph = phenyl; Ts = tosyl, -S{O}2-p-C6H4Me). The iron(II) salt also acts as a Lewis acid in non-coordinating CH2Cl2 solution, to catalyze heterolytic CN bond cleavage of the aziridine and insertion of dipolarophiles. The 1,3-zwitterionic intermediate is presumably supported by interaction of the metal dication with the anion, and by resonance stabilization of the carbocation. Nucleophilic dipolarophiles then insert to give a five-membered heterocyclic ring. The result is a two-step cycloaddition, formally [2 + 1 + 2], that is typically regiospecific, but not stereospecific. This reaction mechanism was confirmed by conducting a series of one-step, [3 + 2] additions of unsaturated molecules into pre-formed 2-phenyl-N-tosylaziridine, also catalyzed by [Fe(NCMe)6](BF4)2. Relevant substrates include styrenes, carbonyl compounds and alkynes. These yield five-membered heterocylic rings, including pyrrolidines, oxazolidines and dihydropyrroles, respectively. The reaction scope appears limited only by the barrier to formation of the dipolar intermediate, and by the nucleophilicity of the captured dipolarophile. The bifunctionality of an inexpensive, earth-abundant and non-toxic catalyst suggests a general strategy for one-pot construction of heterocyclic rings, as demonstrated specifically for pyrrolidine ring formation.
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Affiliation(s)
- Shengwen Liang
- Department of Chemistry and Biochemistry, Ohio University, Athens, OH 45701, USA
| | - Michael P Jensen
- Department of Chemistry and Biochemistry, Ohio University, Athens, OH 45701, USA.
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2
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Yin HN, Wang PC, Liu Z. Recent advances in biocatalytic C-N bond-forming reactions. Bioorg Chem 2024; 144:107108. [PMID: 38244379 DOI: 10.1016/j.bioorg.2024.107108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Revised: 12/25/2023] [Accepted: 01/06/2024] [Indexed: 01/22/2024]
Abstract
Molecules containing C-N bonds are of paramount importance in a diverse array of organic-based materials, natural products, pharmaceutical compounds, and agricultural chemicals. Biocatalytic C-N bond-forming reactions represent powerful strategies for producing these valuable targets, and their significance in the field of synthetic chemistry has steadily increased over the past decade. In this review, we provide a concise overview of recent advancements in the development of C-N bond-forming enzymes, with a particular emphasis on the inherent chemistry involved in these enzymatic processes. Overall, these enzymatic systems have proven their potential in addressing long-standing challenges in traditional small-molecule catalysis.
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Affiliation(s)
- Hong-Ning Yin
- National Institute of Biological Sciences, Beijing 102206, China; Tsinghua Institute of Multidisciplinary Biomedical Research, Tsinghua University, Beijing 100084, China
| | - Peng-Cheng Wang
- National Institute of Biological Sciences, Beijing 102206, China
| | - Zhen Liu
- National Institute of Biological Sciences, Beijing 102206, China; Tsinghua Institute of Multidisciplinary Biomedical Research, Tsinghua University, Beijing 100084, China.
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3
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Kotwal N, Chauhan P. Accessing Pyridines via a Nitrene Internalization Process. Angew Chem Int Ed Engl 2024; 63:e202317228. [PMID: 38116832 DOI: 10.1002/anie.202317228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Revised: 12/15/2023] [Accepted: 12/20/2023] [Indexed: 12/21/2023]
Abstract
Pyridines are valuable pharmacophores, and their access via direct and selective transmutation of carbon atom with desired nitrogen could become crucial in drug discovery processes. However, only scarce examples can be found when it comes C-to-N-transmutation reactions of aromatics that could lead to the facile synthesis of pyridines or other azaarenes. In this context, Levin and co-workers recently disclosed a process leading to pyridines from the corresponding aryl azides via the regioselective nitrene internalization process. Notably, the transformation did not lead to any further modification of the rest of the aromatic skeleton. This innovative work enabled selectively accessing various pyridine derivatives through direct nitrogen scan operations on benzene derivatives, which were otherwise not feasible.
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Affiliation(s)
- Namrata Kotwal
- Department of Chemistry, Indian Institute of Technology Jammu, Jagti, NH-44, Nagrota Bypass, Jammu, 181221, J&K, India
| | - Pankaj Chauhan
- Department of Chemistry, Indian Institute of Technology Jammu, Jagti, NH-44, Nagrota Bypass, Jammu, 181221, J&K, India
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4
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Baris N, Dračínský M, Tarábek J, Filgas J, Slavíček P, Ludvíková L, Boháčová S, Slanina T, Klepetářová B, Beier P. Photocatalytic Generation of Trifluoromethyl Nitrene for Alkene Aziridination. Angew Chem Int Ed Engl 2024; 63:e202315162. [PMID: 38081132 DOI: 10.1002/anie.202315162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Indexed: 01/06/2024]
Abstract
N-Trifluoromethylated organics may be applied in drug design, agrochemical synthesis, and materials science, among other areas. Yet, despite recent advances in the synthesis of aliphatic, cyclic and heterocyclic N-trifluoromethyl compounds, no strategy based on trifluoromethyl nitrene has hitherto been explored. Here we describe the formation of triplet trifluoromethyl nitrene from azidotrifluoromethane, a stable and safe-to-use precursor, by visible light photocatalysis. The addition of CF3 N to alkenes via biradical intermediates afforded previously unknown aziridines substituted with trifluoromethyl group on the nitrogen atom. The obtained aziridines were converted into either N-trifluoromethylimidazolines, via formal [3+2] cycloaddition with nitriles, mediated by a Lewis acid, or into N-trifluoromethylaldimines, via ring opening and aryl group migration mediated by a strong Brønsted acid. Our findings open new opportunities for the development of novel classes of N-CF3 compounds with possible applications in the life sciences.
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Affiliation(s)
- Norbert Baris
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 2, 166 00, Prague 6, Czech Republic
- Department of Organic Chemistry, Faculty of Science, Charles University, Hlavova 2030/8, 128 43, Prague, Czech Republic
| | - Martin Dračínský
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 2, 166 00, Prague 6, Czech Republic
| | - Ján Tarábek
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 2, 166 00, Prague 6, Czech Republic
| | - Josef Filgas
- Department of Physical Chemistry, University of Chemistry and Technology, Technická 5, 166 28, Prague, Czech Republic
| | - Petr Slavíček
- Department of Physical Chemistry, University of Chemistry and Technology, Technická 5, 166 28, Prague, Czech Republic
| | - Lucie Ludvíková
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 2, 166 00, Prague 6, Czech Republic
| | - Soňa Boháčová
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 2, 166 00, Prague 6, Czech Republic
| | - Tomáš Slanina
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 2, 166 00, Prague 6, Czech Republic
| | - Blanka Klepetářová
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 2, 166 00, Prague 6, Czech Republic
| | - Petr Beier
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 2, 166 00, Prague 6, Czech Republic
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5
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Ravindra S, Natarajan K, Padma Priya VR, Kataria R, Nandi GC. Visible Light Mediated Co-Catalyzed Isocyanide Insertion with Sulfonyl Azide: Synthesis of Sulfonyl Carbamimidic Azide and Sulfonyl Aminotetrazole via Carbodiimide Intermediate. Chemistry 2023; 29:e202303153. [PMID: 37878800 DOI: 10.1002/chem.202303153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Revised: 10/24/2023] [Accepted: 10/25/2023] [Indexed: 10/27/2023]
Abstract
Herein, we report an operationally simple and efficient protocol to prepare sulfonyl carbamimidic azide and N-sulfonyl aminotetrazole via Co-catalyzed three component coupling of sulfonyl azide (acts as nitrene source), isocyanide, and TMS-azide at room temperature under visible light. Initially, the carbamimidic azide is formed, which cyclizes only in the presence of base to deliver N-sulfonyl aminotetrazole in very good yields. The sulfonyl aminotetrazole can also be synthesized directly without isolating the carbamimidic azide in the presence of base. The sulfonyl azide is anticipated to generate nitrene and reacts with isocyanide to produce carbodiimide. Subsequent addition of azide (TMS-N3 ) to carbodiimide results in the formation of carbamimidic azide.
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Affiliation(s)
- Sundaresan Ravindra
- Department of Chemistry, National Institute of Technology- Tiruchirappalli, Tiruchirappalli, Tamilnadu, 620 015, India
| | - Kannan Natarajan
- Department of Chemistry, National Institute of Technology- Tiruchirappalli, Tiruchirappalli, Tamilnadu, 620 015, India
| | - Vetrivel R Padma Priya
- Department of Chemistry, National Institute of Technology- Tiruchirappalli, Tiruchirappalli, Tamilnadu, 620 015, India
| | - Ramesh Kataria
- Department of Chemistry and Centre for Advanced Studies in Chemistry, Panjab University, Chandigarh, 160014, India
| | - Ganesh Chandra Nandi
- Department of Chemistry, National Institute of Technology- Tiruchirappalli, Tiruchirappalli, Tamilnadu, 620 015, India
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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] [What about the content of this article? (0)] [Affiliation(s)] [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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Tang X, Noda H, Shibasaki M. Locking the Conformation of a Paddlewheel Rhodium Complex: Design, Synthesis, and Applications in Catalytic Nitrene Transfers. Angew Chem Int Ed Engl 2023:e202311027. [PMID: 37749060 DOI: 10.1002/anie.202311027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 09/22/2023] [Accepted: 09/25/2023] [Indexed: 09/27/2023]
Abstract
The exponential proliferation of conformers makes it impossible to examine the entire population in most systems. Controlling conformational ensembles is thus pivotal in many areas of chemistry. Rh2 (esp)2 , a dicarboxylate-derived paddlewheel rhodium complex, is one of the most effective catalysts for nitrene chemistry. Its enormous success has led to preparing many analogous complexes. However, there has been little consideration for the conformational dynamics of the parent catalyst. Herein, we report a new ligand modification principle that prevents conformer interconversion. The resulting complex comprises two isolable conformers, whose structures have been determined by X-ray diffraction. Combined experimental and computational data has revealed similarities and dissimilarities between the conformationally confined and parent complexes. Three model cases have demonstrated the utility of conformational fixation in the development of stereoselective catalysts for nitrene transfer reactions. The design principle described in this study can be combined with other established modification strategies, serving as a springboard for further advancement of the chemistry of paddlewheel metal complexes.
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Affiliation(s)
- Xinxin Tang
- Institute of Microbial Chemistry (BIKAKEN), Tokyo, 3-14-23 Kamiosaki, Shinagawa-ku, 141-0021, Tokyo, Japan
| | - Hidetoshi Noda
- Institute of Microbial Chemistry (BIKAKEN), Tokyo, 3-14-23 Kamiosaki, Shinagawa-ku, 141-0021, Tokyo, Japan
| | - Masakatsu Shibasaki
- Institute of Microbial Chemistry (BIKAKEN), Tokyo, 3-14-23 Kamiosaki, Shinagawa-ku, 141-0021, Tokyo, Japan
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8
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Passia MT, Bormann N, Ward JS, Rissanen K, Bolm C. Synthesis of N-Monosubstituted Sulfondiimines by Metal-free Iminations of Sulfiliminium Salts. Angew Chem Int Ed Engl 2023:e202305703. [PMID: 37141043 DOI: 10.1002/anie.202305703] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Revised: 05/04/2023] [Accepted: 05/04/2023] [Indexed: 05/05/2023]
Abstract
Sulfondiimines are marginalized entities among nitrogencontaining organosulfur compounds, despite offering promising properties for applications in various fields including medicinal and agrochemical. Herein, we present a metal-free and rapid synthetic procedure for the synthesis of N-monosubstituted sulfondiimines that overcomes current limitations in their synthetic accessibility. Particularly, S,S-dialkyl substrates, which are commonly difficult to convert by existing methods, react well with a combination of iodine, 1,8-diazabicyclo[5.4.0]undec-7-en (DBU), and iminoiodanes (PhINR) in acetonitrile (MeCN) to furnish the corresponding sulfondiimines in yields up to 85% (25 examples). Valuable "free" NH-N'Hsulfondiimines can then be accessed by N-deprotection under mild reaction conditions. Several experimental observations suggest a mechanistic pathway diverging from the common radical-based iodine/iminoiodane mechanism. Based on the experimental results in combination with data obtained by 1H-NMR spectroscopy, ESI mass spectrometry, and crystallographic analysis we propose a direct amination from PhINNs and a reaction path via a cationic iodonitrene.
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Affiliation(s)
- Marco T Passia
- RWTH Aachen University: Rheinisch-Westfalische Technische Hochschule Aachen, Chemistry, GERMANY
| | - Niklas Bormann
- RWTH Aachen University: Rheinisch-Westfalische Technische Hochschule Aachen, Chemistry, GERMANY
| | - Jas S Ward
- University of Jyväskylä: Jyvaskylan Yliopisto, Chemistry, FINLAND
| | - Kari Rissanen
- University of Jyväskylä: Jyvaskylan Yliopisto, Chemistry, FINLAND
| | - Carsten Bolm
- RWTH Aachen University: Rheinisch-Westfalische Technische Hochschule Aachen, Chemistry, Landoltweg 1, 52056, Aachen, GERMANY
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9
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Qian W, Wende RC, Schreiner PR, Mardyukov A. Selective Preparation of Phosphorus Mononitride (P≡N) from Phosphinoazide and Reversible Oxidation to Phosphino nitrene. Angew Chem Int Ed Engl 2023; 62:e202300761. [PMID: 36877095 DOI: 10.1002/anie.202300761] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Revised: 03/05/2023] [Accepted: 03/06/2023] [Indexed: 03/07/2023]
Abstract
The interstellar candidate phosphorus mononitride PN, a metastable species, was generated through high-vacuum flash pyrolysis of (o-phenyldioxyl)phosphinoazide in cryogenic matrices. Although the PN stretching band was not directly detected because of its low infrared intensity and possible overlaps with other strong bands, o-benzoquinone, carbon monoxide, and cyclopentadienone as additional fragmentation products were clearly identified. Moreover, an elusive o-benzoquinone-PN complex formed when (o-phenyldioxyl)phosphinoazide was exposed to UV irradiation at λ = 254 nm. Its recombination to (o-phenyldioxyl)-λ5-phosphinonitrile was observed upon irradiation with the light λ = 523 nm, which demonstrates for the first time the reactivity of PN towards an organic molecule. Free energy profile computations at the B3LYP/def2-TZVP density functional theory level reveal a concerted mechanism. To provide further evidence, UV/Vis spectra of the precursor and the irradiation products were recorded and agree well with time-dependent DFT computations.
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Affiliation(s)
- Weiyu Qian
- University of Giessen: Justus Liebig Universitat Giessen, Institute of Organic Chemistry, GERMANY
| | - Raffael C Wende
- Justus Liebig Universitat Giessen, Institute of Organic Chemistry, GERMANY
| | - Peter R Schreiner
- Justus Liebig Universitat Giessen, Institute of Organic Chemistry, GERMANY
| | - Artur Mardyukov
- Justus-Liebig University, Institute of Organic Chemistry, Heinrich-Buff-Ring 17, 35392, Giessen, GERMANY
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10
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Nie X, Ye C, Ivlev SI, Meggers E. Nitrene-Mediated C-H Oxygenation: Catalytic Enantioselective Formation of Five-Membered Cyclic Organic Carbonates. Angew Chem Int Ed Engl 2022; 61:e202211971. [PMID: 36184573 PMCID: PMC9827974 DOI: 10.1002/anie.202211971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2022] [Indexed: 11/06/2022]
Abstract
The synthesis of non-racemic 5-membered cyclic carbonates from abundant alcohols is reported. Conversion of the alcohol into an azanyl carbonate is followed by a chiral-at-ruthenium catalyzed cyclization to provide chiral cyclic carbonates in yields of up to 95 % and with up to 99 % ee. This new synthetic method is proposed to proceed through a nitrene-mediated intramolecular C(sp3 )-H oxygenation which includes an unusual 1,7-hydrogen atom transfer within a ruthenium nitrene intermediate. The method is applicable to the synthesis of non-racemic chiral mono-, di- and trisubstituted cyclic alkylene carbonates.
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Affiliation(s)
- Xin Nie
- Fachbereich ChemiePhilipps-Universität MarburgHans-Meerwein-Straße 435043MarburgGermany
| | - Chen‐Xi Ye
- Fachbereich ChemiePhilipps-Universität MarburgHans-Meerwein-Straße 435043MarburgGermany
| | - Sergei I. Ivlev
- Fachbereich ChemiePhilipps-Universität MarburgHans-Meerwein-Straße 435043MarburgGermany
| | - Eric Meggers
- Fachbereich ChemiePhilipps-Universität MarburgHans-Meerwein-Straße 435043MarburgGermany
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11
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Huang L, Zhang F, Sun W, Kang X. Nitrene-functionalized ruthenium nanoparticles: Spectral evidence for the conjugated ruthenium-nitrene π bonds and the impact on the catalytic activity. J Colloid Interface Sci 2020; 588:761-766. [PMID: 33308851 DOI: 10.1016/j.jcis.2020.11.109] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Revised: 11/10/2020] [Accepted: 11/26/2020] [Indexed: 11/30/2022]
Abstract
In this manuscript, ruthenium (Ru) nanoparticles functionalized with nitrene ligands through the ruthenium-nitrene (RuN) π bonds are explored. By synthesizing the nitrene ligands with and without 15N-labelling, RuN π bonds on Ru nanoparticles are evidenced by experimental and theoretically calculated FTIR spectra. The coordination of nitrene ligands on Ru nanoparticles surface, the interfacial charge delocalization and the impact of nitrene ligands on the catalytic performance of Ru nanoparticles are further characterized by magic-angle spinning solid-state carbon nuclear magnetic resonance spectroscopy (13C NMR) of 13CO-adsorbed Ru nanoparticles, photoluminescence and the hydrogenation of styrene.
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Affiliation(s)
- Lin Huang
- New Energy Research Institute, School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China
| | - Fengqi Zhang
- New Energy Research Institute, School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China
| | - Wenming Sun
- Department of Applied Chemistry, China Agricultural University, Beijing 100193, China
| | - Xiongwu Kang
- New Energy Research Institute, School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China.
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12
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Murakami T, Sato Y, Yoshioka K, Tanaka M. Convenient stereocontrolled amidoglycosylation of alcohols with acetylated glycals and trichloroethoxysulfonamide. Carbohydr Res 2016; 434:121-131. [PMID: 27639338 DOI: 10.1016/j.carres.2016.09.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Revised: 09/02/2016] [Accepted: 09/02/2016] [Indexed: 11/27/2022]
Abstract
A regio- and stereo-controlled, rhodium(II)-catalyzed amidoglycosylation of alcohols has been developed using O-acetylated glycals, trichloroethoxysulfonamide, and iodosobenzene. This one-pot amidoglycosylation was applied to a variety of primary and secondary alcohols to afford the β-O-glycosides with acceptable yields up to 84%. The reaction would proceed via stereoselective intermolecular aziridination of the glycal from the α-face followed by SN2 reaction with alcohol at C-1 from the β-face to give 1,2:2,3-di-trans-substituted isomer only.
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Affiliation(s)
- Teiichi Murakami
- Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Central 6, Tsukuba, Ibaraki 305-8566, Japan.
| | - Yukari Sato
- Research Institute for Energy Conservation, National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Central 2, Tsukuba, Ibaraki 305-8562, Japan
| | - Kyoko Yoshioka
- Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 6, Tsukuba, Ibaraki 305-8566, Japan
| | - Mutsuo Tanaka
- Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Central 6, Tsukuba, Ibaraki 305-8566, Japan
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13
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Peng H, Dornevil KH, Draganov AB, Chen W, Dai C, Nelson WH, Liu A, Wang B. An unexpected copper catalyzed 'reduction' of an arylazide to amine through the formation of a nitrene intermediate. Tetrahedron 2013; 69:5079-5085. [PMID: 23997313 PMCID: PMC3752911 DOI: 10.1016/j.tet.2013.04.091] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Azido nitrobenzoxadiazole (NBD) was observed to undergo a 'reduction' reaction in the absence of an obvious reducing agent, leading to amine formation. In the presence of an excess amount of DMSO, a sulfoxide conjugate was also formed. The ratio of these two products was both temperature- and solvent-dependent, with the addition of water significantly enhancing the ratio of the 'reduction' product. Two intermediates of the azido-NBD reaction in DMSO were trapped and characterized by low-temperature EPR spectroscopy. One was an organic free radical (S=1/2) and another was a triplet nitrene (S=1) species. A mechanism was proposed based on the characterized free radical and triplet intermediates.
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Affiliation(s)
- Hanjing Peng
- Department of Chemistry, Center for Biotechnology and Drug Design, and Center for Diagnostics and Therapeutics, Georgia State University, P.O. Box 3965, Atlanta, Georgia 30302-3965, USA
| | - Kednerlin H. Dornevil
- Department of Chemistry, Center for Biotechnology and Drug Design, and Center for Diagnostics and Therapeutics, Georgia State University, P.O. Box 3965, Atlanta, Georgia 30302-3965, USA
| | - Alexander B. Draganov
- Department of Chemistry, Center for Biotechnology and Drug Design, and Center for Diagnostics and Therapeutics, Georgia State University, P.O. Box 3965, Atlanta, Georgia 30302-3965, USA
| | - Weixuan Chen
- Department of Chemistry, Center for Biotechnology and Drug Design, and Center for Diagnostics and Therapeutics, Georgia State University, P.O. Box 3965, Atlanta, Georgia 30302-3965, USA
| | - Chaofeng Dai
- Department of Chemistry, Center for Biotechnology and Drug Design, and Center for Diagnostics and Therapeutics, Georgia State University, P.O. Box 3965, Atlanta, Georgia 30302-3965, USA
| | - William H. Nelson
- Department of Physics and Astronomy, Georgia State University, P.O. Box 4106, Atlanta, Georgia 30302-4106, USA
| | - Aimin Liu
- Department of Chemistry, Center for Biotechnology and Drug Design, and Center for Diagnostics and Therapeutics, Georgia State University, P.O. Box 3965, Atlanta, Georgia 30302-3965, USA
| | - Binghe Wang
- Department of Chemistry, Center for Biotechnology and Drug Design, and Center for Diagnostics and Therapeutics, Georgia State University, P.O. Box 3965, Atlanta, Georgia 30302-3965, USA
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