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Fonseca-López D, Ezenarro-Salcedo D, Nachtigall FM, Santos LS, Macías MA, Rojas RS, Hurtado JJ. Air-Stable Cobalt(III) and Chromium(III) Complexes as Single-Component Catalysts for the Activation of Carbon Dioxide and Epoxides. Inorg Chem 2024; 63:9066-9077. [PMID: 38670933 DOI: 10.1021/acs.inorgchem.4c00151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/28/2024]
Abstract
Cobalt(III) and chromium(III) salophen chloride complexes were synthesized and tested for the cycloaddition of carbon dioxide (CO2) with epoxides to obtain cyclic carbonates. The cat1, cat2, cat4, and cat5 complexes presented high catalytic activity without cocatalysts and are solvent-free at 100 °C, 8 bar, and 9 h. At these conditions, the terminal epoxides (1a-1k) were successfully converted into the corresponding cyclic carbonates with a maximum conversion of ∼99%. Moreover, cat5 was highlighted due to its capability of opening internal epoxides such as limonene oxide (1l) with a 36% conversion to limonene carbonate (2l), and from cyclohexene oxide (1m), cyclic trans-cyclohexene carbonate (2m) and poly(cyclohexene carbonate) were obtained with 15% and 85% selectivity, respectively. A study of the coupling reaction mechanism was proposed with the aid of electrospray ionization mass spectrometry (ESI-MS) analysis, confirming the single-component behavior of the complexes through their ionization due to epoxide coordination. In addition, crystallographic analysis of cat1 single crystals grown in a saturated solution of pyridine helped to demonstrate that the substitution of chloride ion by pyridine ligands to form an octahedral coordination occurs (Py-cat1), supporting the proposed mechanism. Also, a recyclability study was performed for cat5, and a total turnover number of 952 was obtained with only minor losses in catalytic activity after five cycles.
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Affiliation(s)
- Daniela Fonseca-López
- Laboratorio en Química Inorgánica, Catálisis y Bioinorgánica, Departamento de Química, Facultad de Ciencias, Universidad de los Andes, Bogotá 111711, Colombia
| | - David Ezenarro-Salcedo
- Laboratorio en Química Inorgánica, Catálisis y Bioinorgánica, Departamento de Química, Facultad de Ciencias, Universidad de los Andes, Bogotá 111711, Colombia
| | - Fabiane M Nachtigall
- Instituto de Ciencias Aplicadas, Universidad Autónoma de Chile, Talca 3467987, Chile
| | - Leonardo S Santos
- Laboratory of Asymmetric Synthesis, Chemistry Institute of Natural Resources, Universidad de Talca, Talca 3460000, Chile
| | - Mario A Macías
- Crystallography and Chemistry of Materials, Department of Chemistry, Universidad de los Andes, Bogotá 111711, Colombia
| | - René S Rojas
- Laboratorio de Química Inorgánica, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago 6094411, Chile
| | - John J Hurtado
- Laboratorio en Química Inorgánica, Catálisis y Bioinorgánica, Departamento de Química, Facultad de Ciencias, Universidad de los Andes, Bogotá 111711, Colombia
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Jatmika C, Goshima K, Wakabayashi K, Akiyama N, Hirota S, Matsuo T. Second-coordination sphere effects on the reactivities of Hoveyda–Grubbs-type catalysts: a ligand exchange study using phenolic moiety-functionalized ligands. Dalton Trans 2020; 49:11618-11627. [DOI: 10.1039/d0dt02353a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reactivities of Hoveyda–Grubbs-type complexes are tunable through second-coordination sphere effects caused by a functional group in the ligand.
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Affiliation(s)
- Catur Jatmika
- Division of Materials Science
- Graduate School of Science and Technology
- Nara Institute of Science and Technology (NAIST)
- Japan
| | - Kenta Goshima
- Division of Materials Science
- Graduate School of Science and Technology
- Nara Institute of Science and Technology (NAIST)
- Japan
| | - Kazumo Wakabayashi
- Division of Materials Science
- Graduate School of Science and Technology
- Nara Institute of Science and Technology (NAIST)
- Japan
| | - Naoki Akiyama
- Division of Materials Science
- Graduate School of Science and Technology
- Nara Institute of Science and Technology (NAIST)
- Japan
| | - Shun Hirota
- Division of Materials Science
- Graduate School of Science and Technology
- Nara Institute of Science and Technology (NAIST)
- Japan
| | - Takashi Matsuo
- Division of Materials Science
- Graduate School of Science and Technology
- Nara Institute of Science and Technology (NAIST)
- Japan
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Tokala R, Bora D, Sana S, Nachtigall FM, Santos LS, Shankaraiah N. Ru(II)-Catalyzed Regioselective Hydroxymethylation of β-Carbolines and Isoquinolines via C-H Functionalization: Probing the Mechanism by Online ESI-MS/MS Screening. J Org Chem 2019; 84:5504-5513. [PMID: 30945857 DOI: 10.1021/acs.joc.9b00454] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A Ru(II)-catalyzed regioselective C-H activation toward hydroxymethylation of β-carbolines and isoquinolines as effective directing groups has been developed, and the mechanism was probed by using online electrospray ionization-tandem mass spectrometry. The introduction of the hydroxymethyl group in the biologically relevant molecules routed via C-H functionalization remains an important task. Gratifyingly, this protocol draws attention to the regioselective formation of monohydroxymethylated β-carboline/isoquinoline products exclusively.
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Affiliation(s)
- Ramya Tokala
- Department of Medicinal Chemistry , National Institute of Pharmaceutical Education and Research (NIPER) , Hyderabad 500037 , India
| | - Darshana Bora
- Department of Medicinal Chemistry , National Institute of Pharmaceutical Education and Research (NIPER) , Hyderabad 500037 , India
| | - Sravani Sana
- Department of Medicinal Chemistry , National Institute of Pharmaceutical Education and Research (NIPER) , Hyderabad 500037 , India
| | - Fabiane M Nachtigall
- Instituto de Ciencias Químicas Aplicadas , Universidad Autónoma de Chile , Sede Talca 3467987 , Chile
| | - Leonardo S Santos
- Instituto de Química de Recursos Naturales , Universidad de Talca , Talca 3462227 , Chile
| | - Nagula Shankaraiah
- Department of Medicinal Chemistry , National Institute of Pharmaceutical Education and Research (NIPER) , Hyderabad 500037 , India
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