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Zhang Y, Takahama K, Osawa Y, Kuwahara D, Yamada R, Oyama KI, Honda M. Characteristics of LED light-induced geometrical isomerization and degradation of astaxanthin and improvement of the color value and crystallinity of astaxanthin utilizing the photoisomerization. Food Res Int 2023; 174:113553. [PMID: 37986432 DOI: 10.1016/j.foodres.2023.113553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Revised: 09/26/2023] [Accepted: 10/01/2023] [Indexed: 11/22/2023]
Abstract
The effects of light-emitting diode (LED) irradiation characterized by different emission wavelengths on the E/Z-isomerization and degradation of astaxanthin were investigated. LED irradiation slightly promoted Z-isomerization of astaxanthin, whereas the all-E-isomerization was highly efficiently promoted at specific wavelengths, especially at 365 nm. Astaxanthin isomers did not degrade significantly when dissolved in ethanol and subjected to LED irradiation conditions for 300 min. However, significant degradation was achieved when ethyl acetate was used for dissolution, and the samples were irradiated at the wavelength of 405 nm. The addition of α-tocopherol suppressed the photodegradation of astaxanthin. LED irradiation significantly affected the physical properties of astaxanthin Z-isomers. Irradiation with 365, 405, and 470 nm LEDs enhanced the color value (redness) and crystallinity of the Z-isomers via an all-E-isomerization reaction. These findings can contribute to the development of technologies that can arbitrarily control the E/Z-isomer ratio and physical properties of astaxanthin.
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Affiliation(s)
- Yelin Zhang
- Department of Chemistry, Faculty of Science & Technology, Meijo University, 1-501 Shiogamaguchi, Tempaku-ku, Nagoya, Aichi 468-8502, Japan; Department of Materials Process Engineering, Nagoya University, Furo-cho, Nagoya, Aichi 464-8601, Japan
| | - Kentaro Takahama
- Technical Center, Nagoya University, Furo-cho, Nagoya, Aichi 464-8601, Japan
| | - Yukiko Osawa
- Biotechnology R&D Group, ENEOS Corporation, 8 Chidoricho, Naka-ku, Yokohama, Kanagawa 231-0815, Japan
| | - Daichi Kuwahara
- Biotechnology R&D Group, ENEOS Corporation, 8 Chidoricho, Naka-ku, Yokohama, Kanagawa 231-0815, Japan
| | - Rio Yamada
- Chemical Instrumentation Facility, Research Center for Materials Science, Nagoya University, Furo-cho, Nagoya, Aichi 464-8602, Japan
| | - Kin-Ichi Oyama
- Chemical Instrumentation Facility, Research Center for Materials Science, Nagoya University, Furo-cho, Nagoya, Aichi 464-8602, Japan
| | - Masaki Honda
- Department of Chemistry, Faculty of Science & Technology, Meijo University, 1-501 Shiogamaguchi, Tempaku-ku, Nagoya, Aichi 468-8502, Japan.
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Győrfi N, Tasnádi G, Gyuris M, Kotschy A. Visible-Light-Induced Synthesis of Branched Ethers via Multicomponent Reactions. J Org Chem 2023. [PMID: 37418511 DOI: 10.1021/acs.joc.3c00804] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/09/2023]
Abstract
The Spin-Center Shift (SCS) elimination is a specific way for the generation of radicals with relevance in synthetic and biochemical pathways. The combination of SCS-mediated radical chemistry and atom-transfer radical addition (ATRA) offers new directions in diversity-oriented chemical synthesis. Herein, we report a photoredox three-component reaction of α-acyloxy-N-heterocycles as radical precursors, styrene derivatives as radical trapping agents, and alcohols as nucleophilic quenchers. The novel radical-polar crossover reaction provides access to a diverse set of branched ethers possessing high structural complexity. The utility of the transformation was also demonstrated by the synthesis of a complex drug derivative and it was easily scalable to the multigram level. The scope and limitations were also explored and a plausible mechanism was proposed.
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Affiliation(s)
- Nándor Győrfi
- Servier Research Institute of Medicinal Chemistry, Záhony u 7, 1031 Budapest, Hungary
- Eötvös Loránd University, Institute of Chemistry, Pázmány Péter s. 1/A, 1117 Budapest, Hungary
| | - Gábor Tasnádi
- Servier Research Institute of Medicinal Chemistry, Záhony u 7, 1031 Budapest, Hungary
| | - Márió Gyuris
- Servier Research Institute of Medicinal Chemistry, Záhony u 7, 1031 Budapest, Hungary
| | - Andras Kotschy
- Servier Research Institute of Medicinal Chemistry, Záhony u 7, 1031 Budapest, Hungary
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MacMillan JWM, McGuire RT, Stradiotto M. Organic Base Enabled Nickel‐Catalyzed Mono‐α‐Arylation of Feedstock Solvents. Chemistry 2022; 28:e202200764. [DOI: 10.1002/chem.202200764] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Indexed: 12/23/2022]
Affiliation(s)
- Joshua W. M. MacMillan
- Department of Chemistry Dalhousie University 6274 Coburg Road, P.O. Box 15000 Halifax, Nova Scotia B3H 4R2 Canada
| | - Ryan T. McGuire
- Department of Chemistry Dalhousie University 6274 Coburg Road, P.O. Box 15000 Halifax, Nova Scotia B3H 4R2 Canada
| | - Mark Stradiotto
- Department of Chemistry Dalhousie University 6274 Coburg Road, P.O. Box 15000 Halifax, Nova Scotia B3H 4R2 Canada
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Yu JT, Li Y, Chen R, Yang Z, Pan C. DTBP-promoted site-selective α-alkoxyl C-H functionalization of alkyl esters: synthesis of 2-alkyl ester substituted chromanones. Org Biomol Chem 2021; 19:4520-4528. [PMID: 33928985 DOI: 10.1039/d1ob00605c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The direct C-H functionalization of ethyl acetates was developed, delivering a variety of 1-(4-oxochroman-2-yl)ethyl acetate derivatives by reacting with chromones. This reaction has a wide substrate scope with excellent site-selective C-H activation at the inactive α-hydrogen of the alkoxyl group instead of the α-hydrogen of the carbonyl group under radical conditions. Compared with other protocols for the α-alkoxyl C-H functionalization of alkyl esters, a distinguishing feature of this reaction is that no metal catalyst was required, with DTBP as the sole oxidant.
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Affiliation(s)
- Jin-Tao Yu
- School of Petrochemical Engineering, Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, Changzhou University, Changzhou 213164, P. R. China.
| | - Yiting Li
- School of Petrochemical Engineering, Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, Changzhou University, Changzhou 213164, P. R. China.
| | - Rongzhen Chen
- School of Petrochemical Engineering, Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, Changzhou University, Changzhou 213164, P. R. China.
| | - Zixian Yang
- School of Petrochemical Engineering, Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, Changzhou University, Changzhou 213164, P. R. China.
| | - Changduo Pan
- School of Petrochemical Engineering, Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, Changzhou University, Changzhou 213164, P. R. China. and School of Chemical and Environmental Engineering, Jiangsu University of Technology, Changzhou 213001, P. R. China
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