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Transfer Hydrogenation of N- and O-Containing Heterocycles Including Pyridines with H 3N-BH 3 Under the Catalysis of the Homogeneous Ruthenium Precatalyst. Org Lett 2024; 26:866-871. [PMID: 38270139 DOI: 10.1021/acs.orglett.3c04051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2024]
Abstract
In this study, we report a transfer hydrogenation protocol that utilizes borane-ammonia (H3N-BH3) as the hydrogen source and a commercially available RuCl3·xH2O precatalyst for the selective aromatic reduction of quinolines, quinoxalines, pyridines, pyrazines, indoles, benzofurans, and furan derivatives to form the corresponding alicyclic heterocycles in good to excellent isolated yields. Applications of this straightforward protocol include the efficient preparation of useful key pharmaceutical intermediates, such as donepezil and flumequine, including a biologically active compound.
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Homogenous nickel-catalyzed chemoselective transfer hydrogenation of functionalized nitroarenes with ammonia-borane. Chem Commun (Camb) 2023. [PMID: 37997758 DOI: 10.1039/d3cc05173k] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2023]
Abstract
Homogeneous Ni-catalyzed highly selective transfer hydrogenation of nitroarenes was successfully established using NH3BH3 as a hydrogen source. A broad range of functional groups were selectively reduced to provide the corresponding anilines in good to high yields. Further, pharmaceutically active compounds can be prepared that would otherwise be challenging to access.
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3
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Methanol as a Potential Hydrogen Source for Reduction Reactions Enabled by a Commercial Pt/C Catalyst. J Org Chem 2023; 88:2245-2259. [PMID: 36753730 DOI: 10.1021/acs.joc.2c02657] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Abstract
Catalytic reduction reactions using methanol as a transfer hydrogenating agent is gaining significant attention because this simple alcohol is inexpensive and produced on a bulk scale. Herein, we report the catalytic utilization of methanol as a hydrogen source for the reduction of different functional organic compounds such as nitroarenes, olefins, and carbonyl compounds. The key to the success of this transformation is the use of a commercially available Pt/C catalyst, which enabled the transfer hydrogenation of a series of simple and functionalized nitroarenes-to-anilines, alkenes-to-alkanes, and aldehydes-to-alcohols using methanol as both the solvent and hydrogen donor. The practicability of this Pt-based protocol is showcased by demonstrating catalyst recycling and reusability as well as reaction upscaling. In addition, the Pt/C catalytic system was also adaptable for the N-methylation and N-alkylation of anilines via the borrowing hydrogen process. This work provides a simple and flexible approach to prepare a variety of value-added products from readily available methanol, Pt/C, and other starting materials.
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4
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Biowaste carbon supported manganese nanoparticles as an active catalyst for the selective hydrogenation of bio-based aldehydes. Catal Today 2022. [DOI: 10.1016/j.cattod.2022.07.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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5
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Recent Trends in Upgrading of CO2 as a C1 Reactant in N‐ and C‐Methylation Reactions. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202200270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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6
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Lignin Residue-Derived Carbon-Supported Nanoscale Iron Catalyst for the Selective Hydrogenation of Nitroarenes and Aromatic Aldehydes. ACS OMEGA 2022; 7:19804-19815. [PMID: 35721941 PMCID: PMC9202032 DOI: 10.1021/acsomega.2c01566] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Accepted: 05/20/2022] [Indexed: 05/05/2023]
Abstract
Heterogeneous iron-based catalysts governing selectivity for the reduction of nitroarenes and aldehydes have received tremendous attention in the arena of catalysis, but relatively less success has been achieved. Herein, we report a green strategy for the facile synthesis of a lignin residue-derived carbon-supported magnetic iron (γ-Fe2O3/LRC-700) nanocatalyst. This active nanocatalyst exhibits excellent activity and selectivity for the hydrogenation of nitroarenes to anilines, including pharmaceuticals (e.g., flutamide and nimesulide). Challenging and reducible functionalities such as halogens (e.g., chloro, iodo, and fluoro) and ketone, ester, and amide groups were tolerated. Moreover, biomass-derived aldehyde (e.g., furfural) and other aromatic aldehydes were also effective for the hydrogenation process, often useful in biomedical sciences and other important areas. Before and after the reaction, the γ-Fe2O3/LRC-700 nanocatalyst was thoroughly characterized by X-ray diffraction (XRD), N2 adsorption-desorption, X-ray photoelectron spectroscopy (XPS), high-resolution transmission electron microscopy (HR-TEM), Raman spectroscopy, and thermogravimetric analysis (TGA). Additionally, the γ-Fe2O3/LRC-700 nanocatalyst is stable and easily separated using an external magnet and recycled up to five cycles with no substantial drop in the activity. Eventually, sustainable and green credentials for the hydrogenation reactions of 4-nitrobenzamide to 4-aminobenzamide and benzaldehyde to benzyl alcohol were assessed with the help of the CHEM21 green metrics toolkit.
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Abstract
Catalysis plays a decisive role in the advancement of sustainable processes in chemical, pharmaceutical, and agrochemical industries as well as petrochemical, material, and energy technologies. Notably, more than 80% of...
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8
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Challenges and recent advancements in the transformation of CO 2 into carboxylic acids: straightforward assembly with homogeneous 3d metals. Chem Soc Rev 2022; 51:9371-9423. [DOI: 10.1039/d1cs00921d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Transformation of carbon dioxide (CO2) into valuable organic carboxylic acids is essential for maintaining sustainability. In this review, such CO2 thermo-, photo- and electrochemical transformations under 3d-transition metal catalysis are described from 2017 until 2022.
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Reductive Amination, Hydrogenation and Hydrodeoxygenation of 5‐Hydroxymethylfurfural using Silica‐supported Cobalt‐ Nanoparticles. ChemCatChem 2021. [DOI: 10.1002/cctc.202101234] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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10
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11
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12
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Simple RuCl
3
‐catalyzed
N
‐Methylation of Amines and Transfer Hydrogenation of Nitroarenes using Methanol. ChemCatChem 2021. [DOI: 10.1002/cctc.202001937] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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13
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Pd/C-catalyzed transfer hydrogenation of aromatic nitro compounds using methanol as a hydrogen source. J INDIAN CHEM SOC 2021. [DOI: 10.1016/j.jics.2021.100014] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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14
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Biorenewable carbon-supported Ru catalyst for N-alkylation of amines with alcohols and selective hydrogenation of nitroarenes. NEW J CHEM 2021. [DOI: 10.1039/d1nj01654g] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A renewable carbon-supported Ru catalyst (Ru/PNC-700) facilely prepared via simple impregnation followed by the pyrolysis process for N-alkylation of anilines with benzyl alcohol and chemoselective hydrogenation of nitroarenes.
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15
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Cover Picture: Synthesis of Functional Chemicals from Lignin‐derived Monomers by Selective Organic Transformations (Adv. Synth. Catal. 23/2020). Adv Synth Catal 2020. [DOI: 10.1002/adsc.202001276] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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16
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Pd-Nanoparticles immobilized organo-functionalized SBA-15: An efficient heterogeneous catalyst for selective hydrogenation of C C double bonds of α,β-unsaturated carbonyl compounds. MOLECULAR CATALYSIS 2020. [DOI: 10.1016/j.mcat.2020.111200] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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17
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Synthesis of Functional Chemicals from Lignin‐derived Monomers by Selective Organic Transformations. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000634] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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18
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Catalytic reductive aminations using molecular hydrogen for synthesis of different kinds of amines. Chem Soc Rev 2020; 49:6273-6328. [DOI: 10.1039/c9cs00286c] [Citation(s) in RCA: 123] [Impact Index Per Article: 30.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Catalytic reductive aminations using molecular hydrogen represent an essential and widely used methodology for the synthesis of different kinds of amines.
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Commercial Pd/C-Catalyzed N-Methylation of Nitroarenes and Amines Using Methanol as Both C1 and H2 Source. J Org Chem 2019; 84:15389-15398. [DOI: 10.1021/acs.joc.9b02141] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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20
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Front Cover: Expedient Synthesis of N
-Methyl- and N
-Alkylamines by Reductive Amination using Reusable Cobalt Oxide Nanoparticles (ChemCatChem 6/2018). ChemCatChem 2018. [DOI: 10.1002/cctc.201800337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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21
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Expedient Synthesis of N
-Methyl- and N
-Alkylamines by Reductive Amination using Reusable Cobalt Oxide Nanoparticles. ChemCatChem 2018. [DOI: 10.1002/cctc.201800339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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22
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Expedient Synthesis of N
-Methyl- and N
-Alkylamines by Reductive Amination using Reusable Cobalt Oxide Nanoparticles. ChemCatChem 2018. [DOI: 10.1002/cctc.201701617] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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23
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Übergangsmetallkatalysierte Nutzung von Methanol als C1-Quelle in der organischen Synthese. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201612520] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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24
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Transition-Metal-Catalyzed Utilization of Methanol as a C1 Source in Organic Synthesis. Angew Chem Int Ed Engl 2017; 56:6384-6394. [DOI: 10.1002/anie.201612520] [Citation(s) in RCA: 171] [Impact Index Per Article: 24.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2016] [Revised: 02/16/2017] [Indexed: 01/05/2023]
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25
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Palladium-catalyzed carbonylative C–H activation of arenes with norbornene as the coupling partner. J Organomet Chem 2016. [DOI: 10.1016/j.jorganchem.2015.12.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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26
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Palladium-Catalyzed Trifluoromethylation of (Hetero)Arenes with CF3
Br. Angew Chem Int Ed Engl 2016; 55:2782-6. [DOI: 10.1002/anie.201511131] [Citation(s) in RCA: 107] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Indexed: 12/30/2022]
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29
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Synthesis of nitriles from amines using nanoscale Co3O4-based catalysts via sustainable aerobic oxidation. Org Biomol Chem 2016; 14:3356-9. [DOI: 10.1039/c6ob00184j] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The selective oxidation of amines for the benign synthesis of nitriles under mild conditions is described.
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30
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Corrigendum: Palladium-Catalyzed Carbonylative Reactions of 1-Bromo-2-fluorobenzenes with Various Nucleophiles: Effective Combination of Carbonylation and Nucleophilic Substitution. Chemistry 2015; 21:17541. [DOI: 10.1002/chem.201504244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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31
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32
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Palladium‐Catalyzed Carbonylative Cyclization of Arenes by CH Bond Activation with DMF as the Carbonyl Source. Chemistry 2015; 21:16370-3. [DOI: 10.1002/chem.201503314] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Indexed: 01/17/2023]
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33
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Convenient copper-mediated Chan–Lam coupling of 2-aminopyridine: facile synthesis of N-arylpyridin-2-amines. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.06.092] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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34
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Heterogeneous Platinum-Catalyzed CH Perfluoroalkylation of Arenes and Heteroarenes. Angew Chem Int Ed Engl 2015; 54:4320-4. [DOI: 10.1002/anie.201411066] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Revised: 12/17/2014] [Indexed: 11/06/2022]
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35
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Heterogeneous Platinum-Catalyzed CH Perfluoroalkylation of Arenes and Heteroarenes. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201411066] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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36
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Nitrogen-Doped Graphene-Activated Iron-Oxide-Based Nanocatalysts for Selective Transfer Hydrogenation of Nitroarenes. ACS Catal 2015. [DOI: 10.1021/cs501916p] [Citation(s) in RCA: 132] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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37
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Pd/C as an efficient heterogeneous catalyst for carbonylative four-component synthesis of 4(3H)-quinazolinones. Catal Sci Technol 2015. [DOI: 10.1039/c5cy00907c] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A relatively mild, operationally simple, phosphine-free and recyclable catalytic system for the carbonylative synthesis of 4(3H)-quinazolinones with 2-iodoanilines, trimethyl orthoformate, and amines as the substrates has been developed.
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38
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High-resolution imaging with SEM/T-SEM, EDX and SAM as a combined methodical approach for morphological and elemental analyses of single engineered nanoparticles. RSC Adv 2014. [DOI: 10.1039/c4ra05092d] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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39
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Palladium-Catalyzed Carbonylative [3+2+1] Annulation ofN-Aryl-Pyridine-2-Amines with Internal Alkynes by CH Activation: Facile Synthesis of 2-Quinolinones. Chemistry 2014; 20:14189-93. [DOI: 10.1002/chem.201404462] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Indexed: 01/02/2023]
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40
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Palladium-Catalyzed Carbonylation of 2-Bromoanilines with 2-Formylbenzoic Acid and 2-Halobenzaldehydes: Efficient Synthesis of Functionalized Isoindolinones. Chemistry 2014; 20:14184-8. [DOI: 10.1002/chem.201404446] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Indexed: 11/08/2022]
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41
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Palladium@Cerium(IV) Oxide-Catalyzed Oxidative Synthesis ofN-(2-Pyridyl)indolesviaCH Activation Reaction. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201400466] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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42
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Palladium-Catalyzed Carbonylations of Aryl Bromides using Paraformaldehyde: Synthesis of Aldehydes and Esters. Angew Chem Int Ed Engl 2014; 53:10090-4. [DOI: 10.1002/anie.201404833] [Citation(s) in RCA: 117] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2014] [Indexed: 12/20/2022]
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43
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Palladium-Catalyzed Carbonylations of Aryl Bromides using Paraformaldehyde: Synthesis of Aldehydes and Esters. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201404833] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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44
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Base-Controlled Selectivity in the Synthesis of Linear and Angular Fused Quinazolinones by a Palladium-Catalyzed Carbonylation/Nucleophilic Aromatic Substitution Sequence. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201402779] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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45
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Base-Controlled Selectivity in the Synthesis of Linear and Angular Fused Quinazolinones by a Palladium-Catalyzed Carbonylation/Nucleophilic Aromatic Substitution Sequence. Angew Chem Int Ed Engl 2014; 53:7579-83. [DOI: 10.1002/anie.201402779] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2014] [Revised: 04/22/2014] [Indexed: 01/03/2023]
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46
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A convenient palladium-catalyzed carbonylative synthesis of quinazolines from 2-aminobenzylamine and aryl bromides. RSC Adv 2014. [DOI: 10.1039/c4ra11303a] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
An interesting approach for the synthesis of 2-functionalized quinazolines has been developed. Various quinazolines have been produced in moderate to excellent yields.
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47
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Palladium-catalyzed oxidative carbonylative coupling of arylboronic acids with terminal alkynes to alkynones. Org Biomol Chem 2014; 12:5590-3. [DOI: 10.1039/c4ob01128g] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first example of palladium-catalyzed oxidative carbonylation of arylboronic acids with terminal alkynes has been developed. By an appropriate combination of a palladium salt, a ligand, and an oxidant, the desired alkynones were isolated in moderate to good yields.
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48
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Efficient palladium-catalyzed double carbonylation of o-dibromobenzenes: synthesis of thalidomide. Org Biomol Chem 2014; 12:5578-81. [DOI: 10.1039/c4ob00796d] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A convenient and mild procedure for double carbonylation of o-dibromobenzene with various 2-amino pyridines and naturally occurring amines has been developed. N-Substituted phthalimides were produced in good to excellent yields. Furthermore, thalidomide was produced in excellent yield under these conditions.
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49
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On the role of surface composition and curvature on biointerface formation and colloidal stability of nanoparticles in a protein-rich model system. Colloids Surf B Biointerfaces 2013; 108:110-9. [PMID: 23528607 DOI: 10.1016/j.colsurfb.2013.02.027] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2012] [Revised: 02/15/2013] [Accepted: 02/18/2013] [Indexed: 12/13/2022]
Abstract
The need for a better understanding of nanoparticle-protein interactions and the mechanisms governing the resulting colloidal stability has been emphasised in recent years. In the present contribution, the short and long term colloidal stability of silica nanoparticles (SNPs) and silica-poly(ethylene glycol) nanohybrids (Sil-PEG) have been scrutinised in a protein model system. Well-defined silica nanoparticles are rapidly covered by bovine serum albumin (BSA) and form small clusters after 20min while large agglomerates are detected after 10h depending on both particle size and nanoparticle-protein ratio. Oppositely, Sil-PEG hybrids present suppressive protein adsorption and enhanced short and long term colloidal stability in protein solution. No critical agglomeration was found for either system in the absence of protein, proving that instability found for SNPs must arise as a consequence of protein adsorption and not to high ionic environment. Analysis of the small angle X-ray scattering (SAXS) structure factor indicates a short-range attractive potential between particles in the silica-BSA system, which is in good agreement with a protein bridging agglomeration mechanism. The results presented here point out the importance of the nanoparticle surface properties on the ability to adsorb proteins and how the induced or depressed adsorption may potentially drive the resulting colloidal stability.
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50
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Multi-parametric reference nanomaterials for toxicology: state of the art, future challenges and potential candidates. RSC Adv 2013. [DOI: 10.1039/c3ra42112k] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
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