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Shichijo K, Kametani Y, Shiota Y, Yoshizawa K, Fujitsuka M, Shimakoshi H. Effect of Macrocycles on the Photochemical and Electrochemical Properties of Cobalt-Dehydrocorrin Complex: Formation and Investigation of Co(I) Species. Inorg Chem 2023; 62:11785-11795. [PMID: 37307067 DOI: 10.1021/acs.inorgchem.3c00882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Co(II)-pyrocobester (P-Co(II)), a dehydrocorrin complex, was semisynthesized from vitamin B12 (cyanocobalamin), and its photochemical and electrochemical properties were investigated and compared to those of the cobester (C-Co(II)), the cobalt-corrin complex. The UV-vis absorptions of P-Co(II) in CH2Cl2, ascribed to the π-π* transition, were red-shifted compared to those of C-Co(II) due to the π-expansion of the macrocycle in the pyrocobester. The reversible redox couple of P-Co(II) was observed at E1/2 = -0.30 V vs Ag/AgCl in CH3CN, which was assigned to the Co(II)/Co(I) redox couple by UV-vis, ESR, and molecular orbital analysis. This redox couple was positively shifted by 0.28 V compared to that of C-Co(II). This is caused by the high electronegativity of the dehydrocorrin macrocycle, which was estimated by DFT calculations for the free-base ligands. The reactivity of the Co(I)-pyrocobester (P-Co(I)) was evaluated by the reaction with methyl iodide in CV and UV-vis to form a photosensitive Co(III)-CH3 complex (P-Co(III)-CH3). The properties of the excited state of P-Co(I), *Co(I), were also investigated by femtosecond transient absorption (TA) spectroscopy. The lifetime of *Co(I) was estimated to be 29 ps from the kinetic trace at 587 nm. The lifetime of *Co(I) became shorter in the presence of Ar-X, such as iodobenzonitrile (1a), bromobenzonitrile (1b), and chlorobenzonitrile (1c), and the rate constants of electron transfer (ET) between the *Co(I) and Ar-X were determined to be 2.9 × 1011 M-1 s-1, 4.9 × 1010 M-1 s-1, and 1.0 × 1010 M-1 s-1 for 1a, 1b, and 1c, respectively.
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Affiliation(s)
- Keita Shichijo
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, Nishi-ku, Motooka, 744, Fukuoka 819-0395, Japan
| | - Yohei Kametani
- Institute for Materials Chemistry and Engineering, Kyushu University, Nishi-ku, Motooka, 744, Fukuoka 819-0395, Japan
| | - Yoshihito Shiota
- Institute for Materials Chemistry and Engineering, Kyushu University, Nishi-ku, Motooka, 744, Fukuoka 819-0395, Japan
| | - Kazunari Yoshizawa
- Institute for Materials Chemistry and Engineering, Kyushu University, Nishi-ku, Motooka, 744, Fukuoka 819-0395, Japan
| | - Mamoru Fujitsuka
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, Osaka 567-0047, Japan
| | - Hisashi Shimakoshi
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, Nishi-ku, Motooka, 744, Fukuoka 819-0395, Japan
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Su YS, Cheng MJ, Wu MD, Chai CY, Kwan AL, Su SH, Kuo YH. Chemical Constituents from a Mangrove-Derived Actinobacteria Isoptericola chiayiensis BCRC 16888 and Evaluation of Their Anti-NO Activity. Chem Biodivers 2021; 18:e2100211. [PMID: 34323355 DOI: 10.1002/cbdv.202100211] [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: 03/19/2021] [Accepted: 06/21/2021] [Indexed: 11/08/2022]
Abstract
Cultivation of the actinobacteria strain Isoptericola chiayiensis, a mangrove-derived actinobacteria that was isolated from a mangrove soil collected in Chiayi County, resulted in the isolation of one new 2-furanone derivative, isopterfuranone (1), one new sesquiterpenoid, isopterchiayione (2), one new benzenoid derivative, isopterinoid (3), five new flavonoids, chiayiflavans A-E (4-8), and 4 metabolites isolated for the first time from nature source, methyl 3-(4-methyl-2,5-dioxopyrrolidin-3-yl)propanoate (9), 3-ethyl-4-methylpyrrolidine-2,5-dione (10), chiayiensol (11) and chiayiensic acid (12). Their structures were determined through in-depth spectroscopic and mass-spectrometric analyses. Most of the isolates showed potent inhibitory effects on NO production in LPS-stimulated RAW 264.7 murine macrophages cells with IC50 values ranging from 9.36 to 40.02 μM. Of these isolates, 4 and 5 showed NO inhibitory activity with IC50 values of 17.14 and 9.36 μM, stronger than the positive control quercetin (IC50 =36.95 μM). This is the first report on flavan metabolites from the genus Isoptericola.
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Affiliation(s)
- Yung-Shun Su
- Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University (KMU), Kaohsiung, 807, Taiwan.,Department of Dermatology, Kaohsiung Medical University Chung-Ho Memorial Hospital, Kaohsiung, 807, Taiwan
| | - Ming-Jen Cheng
- Bioresource Collection and Research Center (BCRC), Food Industry Research and Development Institute (FIRDI), Hsinchu, 300, Taiwan
| | - Ming-Der Wu
- Bioresource Collection and Research Center (BCRC), Food Industry Research and Development Institute (FIRDI), Hsinchu, 300, Taiwan
| | - Chee-Yin Chai
- Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University (KMU), Kaohsiung, 807, Taiwan.,Department of Pathology, Kaohsiung Medical University Chung-Ho Memorial Hospital, Kaohsiung, 807, Taiwan
| | - Aij-Lie Kwan
- Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University (KMU), Kaohsiung, 807, Taiwan.,Department of Neurosurgery, Kaohsiung Medical University Chung-Ho Memorial Hospital, Kaohsiung, 807, Taiwan
| | - Sheng-Han Su
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan
| | - Yueh-Hsiung Kuo
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan.,Department of Chinese Pharmaceutical Sciences and Chinese Medicine Resources, College of Pharmacy, China Medical University, Taichung, 404, Taiwan.,Department of Biotechnology, Asia University, Taichung, 413, Taiwan.,Chinese Medicine Research Center, China Medical University, Taichung, 404, Taiwan
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Kurcoń S, Proinsias KÓ, Gryko D. Cobryketone Derived from Vitamin B12via Palladium-Catalyzed Cleavage of the sp3–sp3 Carbon–Carbon Bond. J Org Chem 2013; 78:4115-22. [DOI: 10.1021/jo4004629] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Sylwester Kurcoń
- Institute of Organic Chemistry PAS, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Keith ó Proinsias
- Institute of Organic Chemistry PAS, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Dorota Gryko
- Institute of Organic Chemistry PAS, Kasprzaka 44/52, 01-224 Warsaw, Poland
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