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Patra SG, Das NK. Recent advancement on the mechanism of olefin metathesis by Grubbs catalysts: A computational perspective. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115096] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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2
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Małecki P, Gajda K, Gajda R, Woźniak K, Trzaskowski B, Kajetanowicz A, Grela K. Specialized Ruthenium Olefin Metathesis Catalysts Bearing Bulky Unsymmetrical NHC Ligands: Computations, Synthesis, and Application. ACS Catal 2018. [DOI: 10.1021/acscatal.8b04783] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Paweł Małecki
- Biological and Chemical Research Centre, Faculty of Chemistry, University of Warsaw, Żwirki i Wigury Street 101, 02-089 Warszawa, Poland
| | - Katarzyna Gajda
- Biological and Chemical Research Centre, Faculty of Chemistry, University of Warsaw, Żwirki i Wigury Street 101, 02-089 Warszawa, Poland
| | - Roman Gajda
- Faculty of Chemistry, University of Warsaw, 02-089 Warszawa, Poland
| | | | | | - Anna Kajetanowicz
- Biological and Chemical Research Centre, Faculty of Chemistry, University of Warsaw, Żwirki i Wigury Street 101, 02-089 Warszawa, Poland
| | - Karol Grela
- Biological and Chemical Research Centre, Faculty of Chemistry, University of Warsaw, Żwirki i Wigury Street 101, 02-089 Warszawa, Poland
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Mellerup SK, Li C, Wang X, Wang S. Controlling Isomerization Selectivity in Chiral, Photochromic N,C-Chelate Organoboron Systems with Extended π-Conjugation. J Org Chem 2018; 83:11970-11977. [PMID: 30178675 DOI: 10.1021/acs.joc.8b01856] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Alkyne-functionalized chelate boron compounds with extended π-conjugation on one of the aryl groups attached to boron display thermally reversible and regioselective isomerization on the more delocalized substituent, forming base-stabilized boriranes with an intense color. Linking two of such boron chromophores through a 1,4-phenylene spacer via ethynyl moieties leads to photochemically inert molecules, while connecting them by a nonconjugated silicon bridge yields photochromic systems capable of switching at a single boron center.
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Affiliation(s)
- Soren K Mellerup
- Department of Chemistry , Queen's University , Kingston , Ontario K7L 3N6 , Canada
| | - Cally Li
- Department of Chemistry , Queen's University , Kingston , Ontario K7L 3N6 , Canada
| | - Xiang Wang
- Department of Chemistry , Queen's University , Kingston , Ontario K7L 3N6 , Canada
| | - Suning Wang
- Department of Chemistry , Queen's University , Kingston , Ontario K7L 3N6 , Canada
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Tanji Y, Mitsutake N, Fujihara T, Tsuji Y. Steric Effect of Carboxylate Ligands on Pd-Catalyzed Intramolecular C(sp 2 )-H and C(sp 3 )-H Arylation Reactions. Angew Chem Int Ed Engl 2018; 57:10314-10317. [PMID: 29863302 DOI: 10.1002/anie.201804566] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Revised: 06/04/2018] [Indexed: 12/15/2022]
Abstract
A bulky carboxylic acid bearing three cyclohexylmethyl substituents at the α-position, namely, tri(cyclohexylmethyl)acetic acid, is demonstrated to act as an efficient ligand source in Pd-catalyzed intramolecular C(sp2 )-H and C(sp3 )-H arylation reactions. The reactions proceed smoothly under mild reaction conditions, even at room temperature due to the steric bulk of the carboxylate ligands, which accelerates the rate-determining C-H bond activation step in the catalytic cycle.
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Affiliation(s)
- Yutaka Tanji
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto, 615-8510, Japan
| | - Naoya Mitsutake
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto, 615-8510, Japan
| | - Tetsuaki Fujihara
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto, 615-8510, Japan
| | - Yasushi Tsuji
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto, 615-8510, Japan
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Abstract
Carbon monoxide is widely acknowledged as an important gasotransmitter in the mammalian system with importance on par with that of nitric oxide. It has also been firmly established as a potential therapeutic agent with a wide range of indications including organ transplantation, cancer, bacterial infection, and inflammation-related conditions such as colitis and sepsis. One major issue in developing CO based therapeutics is its delivery in a pharmaceutically acceptable form. Currently, there are generally five forms of deliveries: inhaled CO, photosensitive CO-releasing molecules, encapsulated CO, CO dissolved in drinks, and molecules that would release CO under physiological conditions without the need for light. For over a decade, the last category only included metal-based CO releasing molecules. What had been missing were organic CO prodrugs, which release CO under physiological conditions with tunable rates and in response to various exogenous and endogenous triggers such as water, chemical reagents, esterase, ROS, and changes in pH. This Account describes our work in this area as well as the demonstration for these organic prodrugs to recapitulate CO's pharmacological effects both in vitro and in vivo. Generally, two categories of CO prodrugs have been developed in our lab. Both can be considered as precursors of norbornadien-7-ones, which readily undergo cheletropic reaction under very mild conditions to extrude CO. The first category of CO prodrugs capitalizes on the inter- and intramolecular inverse electron demand Diels-Alder (DAinv) reaction to trigger CO release under physiological conditions. As for the bimolecular CO prodrugs, we proposed a new concept of "enrichment triggered CO release" by conjugating both components with a mitochondria-targeting moiety to achieve targeted CO delivery with improved biological outcomes in vitro and in vivo. As for the unimolecular CO prodrugs, the release half-lives can be readily tuned from minutes to days by varying the substituents on the dienone ring, the tethering linker, and the alkyne. Some significant structure-release rates relationships (SRRs) have been unveiled. An esterase-activated CO prodrug and a cascade prodrug system for co-delivery of CO and another payload have also been devised using such an intramolecular click and release strategy. The second category of CO prodrugs leverage on an elimination reaction to generate norbornadien-7-ones for CO release from norborn-2-en-7-ones. In the case of pH-sensitive ones, the CO release is triggered by β-elimination, and the release rate can be quantitatively predicted using the Hammett constant of the substituents on the leaving group. The ROS-activated ones take advantage of ROS-induced selenoxide elimination to achieve targeted CO delivery to disease sites with elevated ROS level. We strongly believe that these CO prodrugs could serve as powerful tools for CO-associated biological studies and are promising candidates for ultimate clinical applications.
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Affiliation(s)
- Xingyue Ji
- Department of Chemistry and Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, Georgia 30303 United States
| | - Binghe Wang
- Department of Chemistry and Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, Georgia 30303 United States
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6
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Steric Effect of Carboxylate Ligands on Pd-Catalyzed Intramolecular C(sp2
)-H and C(sp3
)-H Arylation Reactions. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201804566] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Beltrán TF, Zaragoza G, Delaude L. Synthesis and complexation of superbulky imidazolium-2-dithiocarboxylate ligands. Dalton Trans 2017; 46:9036-9048. [PMID: 28660927 DOI: 10.1039/c7dt01889d] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
The superbulky N-heterocyclic carbenes (NHCs) 2,6-bis(diphenylmethyl)-4-methylimidazol-2-ylidene (IDip*Me) and its 4-methoxy analogue (IDip*OMe) reacted instantaneously with carbon disulfide to afford the corresponding imidazolium-2-dithiocarboxylate zwitterions in high yields. These new dithiolate ligands were fully characterized and their coordination chemistry toward common Re(i) and Ru(ii) metal sources was thoroughly investigated. Neutral [ReBr(CO)3(S2C·NHC)] chelates featured three facially-arranged carbonyl groups on a distorted octahedron, whereas cationic [RuCl(p-cymene)(S2C·NHC)]PF6 complexes displayed a piano-stool geometry. The molecular structures of the six new compounds revealed that the NHC·CS2 inner salts were highly flexible. Indeed, the torsion angle between their anionic and cationic moieties varied between ca. 63° in the free ligands and 3° in the ruthenium complexes. Concomitantly, the S-C-S bite angle underwent a contraction from 131° to 110-113° upon chelation. Computation of the %VBur parameter showed that the dithiocarboxylate unit of the NHC·CS2 betaines chiefly determined the steric requirements of the imidazolium moieties, irrespective of the metal center involved in the complexation. The replacement of the p-methyl substituents of IDip*Me with p-methoxy groups in IDip*OMe did not significantly affect the ligand bulkiness. The more electron-donating methoxy group led, however, to small changes in various IR wavenumbers used to probe the electron donor properties of the carbene moiety.
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Affiliation(s)
- Tomás F Beltrán
- Laboratory of Organometallic Chemistry and Homogeneous Catalysis, Institut de Chimie (B6a), Allée du six Août 13, Quartier Agora, Université de Liège, 4000 Liège, Belgium.
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Reimann S, Ehlers P, Sharif M, Spannenberg A, Langer P. A general protocol for the efficient synthesis of polyarylated benzenes by multiple Suzuki-Miyaura reactions of polychlorinated benzenes. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.01.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Yu B, Luo Z, Hamad FB, Leus K, van Hecke K, Verpoort F. Effect of the bulkiness of indenylidene moieties on the catalytic initiation and efficiency of second-generation ruthenium-based olefin metathesis catalysts. Catal Sci Technol 2016. [DOI: 10.1039/c5cy01506e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Fast initiation and high efficiency of ruthenium indenylidene catalysts induced by steric repulsion between two ligands (SIMes ligand and bulky indenylidene ligand).
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Affiliation(s)
- Baoyi Yu
- Department of Inorganic and Physical Chemistry
- Ghent University
- Krijgslaan 281-S3
- 9000 Ghent
- Belgium
| | - Zhixiong Luo
- Laboratory of Organometallics
- Catalysis and Ordered Materials
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing
- Wuhan University of Technology
- Wuhan 430070
| | - Fatma B. Hamad
- Dar es Salaam University College of Education
- Faculty of Science
- Department of Chemistry
- Dar es Salaam
- Tanzania
| | - Karen Leus
- Department of Inorganic and Physical Chemistry
- Ghent University
- Krijgslaan 281-S3
- 9000 Ghent
- Belgium
| | - Kristof van Hecke
- Department of Inorganic and Physical Chemistry
- Ghent University
- Krijgslaan 281-S3
- 9000 Ghent
- Belgium
| | - Francis Verpoort
- Laboratory of Organometallics
- Catalysis and Ordered Materials
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing
- Wuhan University of Technology
- Wuhan 430070
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Fujihara T, Yoshikawa T, Satou M, Ohta H, Terao J, Tsuji Y. N-Heterocyclic carbene ligands bearing poly(ethylene glycol) chains: effect of the chain length on palladium-catalyzed coupling reactions employing aryl chlorides. Chem Commun (Camb) 2015; 51:17382-5. [DOI: 10.1039/c5cc07588b] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
N-Heterocyclic carbenes bearing poly(ethylene glycol) chains of different lengths have been employed as ligands in palladium-catalyzed coupling reactions of aryl chlorides.
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Affiliation(s)
- Tetsuaki Fujihara
- Department of Energy and Hydrocarbon Chemistry
- Graduate School of Engineering
- Kyoto University
- Kyoto 615-8510
- Japan
| | - Takahiro Yoshikawa
- Department of Energy and Hydrocarbon Chemistry
- Graduate School of Engineering
- Kyoto University
- Kyoto 615-8510
- Japan
| | - Motoi Satou
- Department of Energy and Hydrocarbon Chemistry
- Graduate School of Engineering
- Kyoto University
- Kyoto 615-8510
- Japan
| | - Hidetoshi Ohta
- Department of Energy and Hydrocarbon Chemistry
- Graduate School of Engineering
- Kyoto University
- Kyoto 615-8510
- Japan
| | - Jun Terao
- Department of Energy and Hydrocarbon Chemistry
- Graduate School of Engineering
- Kyoto University
- Kyoto 615-8510
- Japan
| | - Yasushi Tsuji
- Department of Energy and Hydrocarbon Chemistry
- Graduate School of Engineering
- Kyoto University
- Kyoto 615-8510
- Japan
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11
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Foscato M, Occhipinti G, Venkatraman V, Alsberg BK, Jensen VR. Automated Design of Realistic Organometallic Molecules from Fragments. J Chem Inf Model 2014; 54:767-80. [DOI: 10.1021/ci4007497] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Marco Foscato
- Department
of Chemistry, University of Bergen, Allégaten 41, N-5007 Bergen, Norway
| | - Giovanni Occhipinti
- Department
of Chemistry, University of Bergen, Allégaten 41, N-5007 Bergen, Norway
| | - Vishwesh Venkatraman
- Department
of Chemistry, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
| | - Bjørn K. Alsberg
- Department
of Chemistry, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
| | - Vidar R. Jensen
- Department
of Chemistry, University of Bergen, Allégaten 41, N-5007 Bergen, Norway
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12
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Fujihara T, Nishida T, Terao J, Tsuji Y. Synthesis and characterization of ruthenium(II) complexes with dendritic N-heterocyclic carbene ligands. Inorganica Chim Acta 2014. [DOI: 10.1016/j.ica.2013.05.026] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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13
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Herndon JW. The chemistry of the carbon-transition metal double and triple bond: Annual survey covering the year 2011. Coord Chem Rev 2013. [DOI: 10.1016/j.ccr.2013.05.011] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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14
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Yamamoto T, Nagata Y, Suginome M. Catalytic Asymmetric Synthesis with Chirality-Switchable Helical Polymer Ligands. J SYN ORG CHEM JPN 2013. [DOI: 10.5059/yukigoseikyokaishi.71.461] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Akai Y, Yamamoto T, Nagata Y, Ohmura T, Suginome M. Enhanced Catalyst Activity and Enantioselectivity with Chirality-Switchable Polymer Ligand PQXphos in Pd-Catalyzed Asymmetric Silaborative Cleavage of meso-Methylenecyclopropanes. J Am Chem Soc 2012; 134:11092-5. [DOI: 10.1021/ja303506k] [Citation(s) in RCA: 111] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Yuto Akai
- Department of Synthetic Chemistry and Biological Chemistry,
Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Takeshi Yamamoto
- Department of Synthetic Chemistry and Biological Chemistry,
Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Yuuya Nagata
- Department of Synthetic Chemistry and Biological Chemistry,
Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Toshimichi Ohmura
- Department of Synthetic Chemistry and Biological Chemistry,
Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Michinori Suginome
- Department of Synthetic Chemistry and Biological Chemistry,
Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
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Fujihara T. New Design of Periphery-Functionalized Ligands and Their Application in Transition-Metal-Catalyzed Reactions. J SYN ORG CHEM JPN 2012. [DOI: 10.5059/yukigoseikyokaishi.70.928] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Delaude L, Demonceau A. Retracing the evolution of monometallic ruthenium–arene catalysts for C–C bond formation. Dalton Trans 2012; 41:9257-68. [DOI: 10.1039/c2dt30293d] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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