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Li R, Mou B, Yamada M, Li W, Nakashima T, Kawai T. From Visible to Near-Infrared Light-Triggered Photochromism: Negative Photochromism. Molecules 2023; 29:155. [PMID: 38202738 PMCID: PMC10780068 DOI: 10.3390/molecules29010155] [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: 10/31/2023] [Revised: 12/13/2023] [Accepted: 12/21/2023] [Indexed: 01/12/2024] Open
Abstract
Photochromic compounds, whose key molecular properties can be effectively modulated by light irradiation, have attracted significant attention for their potential applications in various research fields. The restriction of photoisomerization coloration induced by ultraviolet light limits their applications in the biomedical field and some other fields. Negative photochromism, wherein a relatively stable colored isomer transforms to a colorless metastable isomer under low-energy light irradiation, offers advantages in applications within materials science and life science. This review provides a summary of negatively photochromic compounds based on different molecular skeletons. Their corresponding design strategies and photochromic properties are presented to provide practical guidelines for future investigations. Negatively photochromic compounds can effectively expand the range of photochromic switches for future applications, offering unique properties such as responsiveness to visible to near-infrared light.
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Affiliation(s)
- Ruiji Li
- School of Pharmacy, Jining Medical University, Rizhao 276826, China; (B.M.); (W.L.)
| | - Bingzhao Mou
- School of Pharmacy, Jining Medical University, Rizhao 276826, China; (B.M.); (W.L.)
| | - Mihoko Yamada
- Division of Materials Science, Nara Institute of Science and Technology (NAIST), Ikoma 630-0192, Japan
| | - Wei Li
- School of Pharmacy, Jining Medical University, Rizhao 276826, China; (B.M.); (W.L.)
| | - Takuya Nakashima
- Division of Materials Science, Nara Institute of Science and Technology (NAIST), Ikoma 630-0192, Japan
- Department of Chemistry, Graduate School of Science, Osaka Metropolitan University, Sumiyoshi, Osaka 558-8585, Japan
| | - Tsuyoshi Kawai
- Division of Materials Science, Nara Institute of Science and Technology (NAIST), Ikoma 630-0192, Japan
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2
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Ito H, Mutoh K, Abe J. Bridged-Imidazole Dimer Exhibiting Three-State Negative Photochromism with a Single Photochromic Unit. J Am Chem Soc 2023; 145:6498-6506. [PMID: 36888966 DOI: 10.1021/jacs.3c00476] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/10/2023]
Abstract
Photochromic molecules that can exhibit multiple states of photochromism in a single photochromic unit are considered more attractive than traditional bistable photochromic molecules because they can offer more versatility and control in photoresponsive systems. We have synthesized a negative photochromic 1-(1-naphthyl)pyrenyl-bridged imidazole dimer (NPy-ImD) that has three different isomers: a colorless isomer, 6MR, a blue-colored isomer, 5MR-B, and a red-colored isomer, 5MR-R. NPy-ImD can interconvert between these isomers via a short-lived transient biradical, BR, upon photoirradiation. 5MR-R is the most stable isomer, and the energy levels of 6MR, 5MR-B, and BR are relatively close to each other. The colored isomers 5MR-R and 5MR-B are photochemically isomerized to 6MR via the short-lived BR upon irradiation with blue light and red light, respectively. The absorption bands of 5MR-R and 5MR-B are well separated by more than 150 nm, with a small overlap, which means they can be selectively excited with different light sources, visible light for 5MR-R and NIR light for 5MR-B. The colorless isomer 6MR is formed from the short-lived BR through a kinetically controlled reaction. 6MR and 5MR-B can then be converted to the more stable isomer 5MR-R through a thermodynamically controlled reaction, which is facilitated by the thermally accessible intermediate, BR. Notably, 5MR-R photoisomerizes to 6MR when irradiated with CW-UV light, whereas it photoisomerizes to 5MR-B by a two-photon process when irradiated with nanosecond UV laser pulses.
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Affiliation(s)
- Hiroki Ito
- Department of Chemistry and Biological Science, College of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5258, Japan
| | - Katsuya Mutoh
- Department of Chemistry and Biological Science, College of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5258, Japan
- Department of Chemistry, Graduate School of Science, Osaka Metropolitan University, Sumiyoshi, Osaka 558-8585, Japan
| | - Jiro Abe
- Department of Chemistry and Biological Science, College of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5258, Japan
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3
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Shi YS, Yang DD, Zheng HW, Liang QF, Fang YH, Xiao T, Zheng XJ. Solvent-Modulated Self-Assembly of Naphthalenediimide-Based Cd(II) Complexes and the Controllable Photochromism via Conformational Isomerization. Inorg Chem 2022; 61:15973-15982. [PMID: 36173106 DOI: 10.1021/acs.inorgchem.2c02249] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Rational regulation of the properties of photochromic materials is a challenging and meaningful work. In the present work, NDI-based complexes, namely, [Cd0.5(NDI)(HBDC)]·H2O (1) and a series of conformational isomers of {[Cd(NDI)0.5(BDC)]·MeCN}n (2), were synthesized by varying the solvent conditions (H2BDC = terephthalic acid, NDI = N,N'-bis(3-pyridylcarbonylhydrazine)-1,4,5,8-naphthalene diimide). Complex 1 exhibits a 0D mononuclear structure without photochromic behavior due to the bad conjugation of the naphthalene diimide moiety. The conformational isomers of complex 2 manifest a 3D network, showing ultra-fast photo-induced intermolecular electron transfer photochromic behavior under X-ray, UV, and visible light. However, they show different photochromic rates and coloring contrast upon photoirradiation, which originates from their difference in the distances of lone pair(COO)···π(NDI). This was realized via controlling the solvent ratio in the reaction system. In addition, compared to UV/X-ray light, 2 exhibits greater sensitivity to visible light and is an organic-inorganic hybrid material with photomodulated luminescence. Based on the excellent performance, complex 2 can be applied to filter paper, showing potential applications as an inkless printing medium and selective perception of ammonia and amine vapors in the solid state via different visual color changes.
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Affiliation(s)
- Yong-Sheng Shi
- Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China
| | - Dong-Dong Yang
- Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China
| | - Han-Wen Zheng
- Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China
| | - Qiong-Fang Liang
- Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China
| | - Yu-Hui Fang
- Beijing National Laboratory of Molecular Science, Beijing Key Laboratory of Magnetoelectric Materials and Devices, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Tong Xiao
- Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China
| | - Xiang-Jun Zheng
- Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China
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Abstract
We report the development of the stepwise photochromic imidazole dimer bridged by a sulfur atom. The one-photon absorption leads to the generation of the colored biradical species, which rapidly recombines to the initial imidazole dimer following first-order reaction kinetics. The further photochemical reaction of the biradical species produces the long-lived colored species, which shows intermolecular dimerization.
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Affiliation(s)
- Katsuya Mutoh
- Department of Chemistry, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5258, Japan
| | - Jiro Abe
- Department of Chemistry, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5258, Japan
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5
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Excitation wavelength- and intensity-dependent stepwise two-photon-induced photochromic reaction. Photochem Photobiol Sci 2022; 21:1445-1458. [PMID: 35527290 DOI: 10.1007/s43630-022-00234-y] [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: 01/28/2022] [Accepted: 04/13/2022] [Indexed: 10/18/2022]
Abstract
The photochromic molecules showing wavelength-selective or light intensity-dependent photoresponse are receiving increased attention in recent years. Although a photoswitch with a single chromophore can control the ON and OFF states of a function, that consisting of multi-chromophores would be useful for the specific control in complex systems. Herein, we designed stepwise two-photon induced photochromic molecules (PABI-PIC and PABI-PIC2) consisting of two different photochromic units (PABI and PIC). One-photon absorption reaction in the UV light region of PABI-PIC generates the short-lived transient biradical (BR) that absorbs an additional photon in the visible and UV light region in a stepwise manner to produce the two-photon photochemical product, the quinoidal species (Quinoid). The photochromic properties of these transient species are completely different in color and fading speed. In addition, PABI-PIC also shows the excitation wavelength-dependent photochromism because the excited states of the PABI and PIC units are electronically orthogonal. Therefore, the stepwise photochromic properties of PABI-PIC are easily controlled depending on the excitation light intensity and wavelength. These molecular designs are important for the development of advanced photoresponsive materials.
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Kobayashi Y, Abe J. Recent advances in low-power-threshold nonlinear photochromic materials. Chem Soc Rev 2022; 51:2397-2415. [PMID: 35262107 DOI: 10.1039/d1cs01144h] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Incoherent nonlinear photophysical and photochemical processes based on stepwise two-photon absorption (2PA) processes have been recently used in materials science owing to their unique photoresponses beyond one-photon processes and lower power thresholds to induce the processes than those of coherent nonlinear optical processes. Among them, nonlinear photochromic materials have received considerable attention because they exhibit unconventional photoresponses compared with other incoherent nonlinear processes such as low-power-threshold nonlinear photoresponses with unimolecular systems, gated photochemical reactions and oxygen-insensitive nonlinear photoresponses. Nonlinear photochromic materials are important not only for colorimetric materials, but also for emergent materials that can enrich the next-generation society such as dynamic holographic materials, which are promising for three-dimensional displays. In this tutorial review, we introduce low-power-threshold nonlinear photochromic materials using stepwise 2PA processes. First, we explain the fundamental concepts of photochemistry as well as photochromic reactions. We attempt to provide an intuitive understanding of incoherent nonlinear optical processes using these fundamental concepts. Then, we introduce several recent examples and potential applications of nonlinear photochromic materials. This tutorial review is important for understanding the scientific progress related to these fields and provides a simple unified picture of the incoherent nonlinear optical properties of different types of photofunctional materials.
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Affiliation(s)
- Yoichi Kobayashi
- Department of Applied Chemistry, College of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan.
| | - Jiro Abe
- Department of Chemistry, School of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5258, Japan.
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Nishijima M, Mutoh K, Abe J. A Qualitative Measure of Diradical Character Based on Radical–Radical Coupling Reaction. CHEM LETT 2021. [DOI: 10.1246/cl.210267] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Moe Nishijima
- Department of Chemistry, Aoyama Gakuin University, Sagamihara, Kanagawa 252-5258, Japan
| | - Katsuya Mutoh
- Department of Chemistry, Aoyama Gakuin University, Sagamihara, Kanagawa 252-5258, Japan
| | - Jiro Abe
- Department of Chemistry, Aoyama Gakuin University, Sagamihara, Kanagawa 252-5258, Japan
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Improved photothermal therapy of brain cancer cells and photogeneration of reactive oxygen species by biotin conjugated gold photoactive nanoparticles. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2020; 215:112102. [PMID: 33388605 DOI: 10.1016/j.jphotobiol.2020.112102] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 10/15/2020] [Accepted: 12/09/2020] [Indexed: 12/20/2022]
Abstract
Herein, we report on the design and development of functionalized acrylic polymeric nanoparticles with Spiropyrans (SPs) and imidazole moieties via superficial polymerizations. Then, Au3+ ions were immobilized and reduced on their surface to obtain photoresponsive gold-decorated polymer nanoparticles(Au-NPs). The synthesized Au-NPs were surface adapted with biotin as specific targeting tumor penetration cells and enhance the intercellular uptake through the endocytosis. FT-IR (Fourier-transform Infrared Spectroscopy), UV-Vis (Ultra Violet-Visible Spectrophotometer), EDS (Energy Dispersive X-Ray Spectroscopy), SEM (Scanning Electron Microscope) and HR-TEM (High-resolution transmission electron microscopy) descriptions were engaged to illustrate their spectral analysis and morphological examinations of Bt@Au-NPs. Fluorescence microscopy images of cellular uptake descriptions and ICP-MS (Inductively coupled plasma mass spectrometry) investigation established the cell lines labeling ability and enhanced targetting efficacy of biotin-conjugated Au-NPs (Bt@Au-NPs) toward C6 glioma cells (brain cancer cells) with 72.5% cellular uptake relative to 30.2% for non-conjugated lone. These were further established through intracellular ROS examinations and in vitro cytotoxicity investigation on the C6 glioma cell line. The solid surface plasmon absorptions of the Au-NPs and Bt@Au-NPs providing raised photothermal therapy under UV irradiation. The synthesized multifunctional Bt@Au-NPs with an inclusive combination of potential resources presented encouraging nanoprobe with targeting capability, improved photodynamic and photothermal cancer therapy.
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Ito H, Mutoh K, Abe J. Enhancement of Negative Photochromic Properties of Naphthalene-Bridged Phenoxyl-Imidazolyl Radical Complex. Chemphyschem 2020; 21:1578-1586. [PMID: 32415707 DOI: 10.1002/cphc.202000296] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Revised: 05/11/2020] [Indexed: 11/07/2022]
Abstract
Negative photochromism has increased attention as a light-switch for functional materials. A development of fast photochromic molecules has been also expected because a rapid thermal back reaction within a millisecond time scale is useful for real-time switching. Herein, we synthesized the derivatives of the naphthalene-bridged phenoxyl-imidazolyl radical complex (Np-PIC) showing the negative photochromism to demonstrate the efficient strategy to increase the visible light sensitivity and to control the thermal back reaction rates. The distances of the C-C bond of the transient 2,4'-isomer shows good agreement with the thermodynamic stability, leading to the control of the thermal back reaction rate. We revealed the cyclic voltammetry and the DFT calculations are efficient to predict the characters of the HOMO and LUMO. The introduction of the electron-withdrawing dicyanoquinodimethane group is efficient to induce the photochromic reaction with increased visible-light sensitivity by the expansion of the π-conjugation. The results will give an important insight for the future development of fast-responsive negative photochromic molecules.
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Affiliation(s)
- Hiroki Ito
- Department of Chemistry, School of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa, 252-5258, Japan
| | - Katsuya Mutoh
- Department of Chemistry, School of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa, 252-5258, Japan
| | - Jiro Abe
- Department of Chemistry, School of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa, 252-5258, Japan
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10
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Ding Y, Jiang S, Gao Y, Nie J, Du H, Sun F. Photochromic Polymers Based on Fluorophenyl Oxime Ester Photoinitiators as Photoswitchable Molecules. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c00198] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Yuyang Ding
- College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
| | - Shengling Jiang
- College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
- Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
| | - Yanjing Gao
- College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
| | - Jun Nie
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
- College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
| | - Hongguang Du
- College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
| | - Fang Sun
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
- College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
- Anqing Research Institute, Beijing University of Chemical Technology, Anqing 246000, People’s Republic of China
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11
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Rational combination of azo moiety and pyridine radical for the construction of photochromic metal-organic frameworks. J SOLID STATE CHEM 2020. [DOI: 10.1016/j.jssc.2020.121374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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12
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Belikov MY, Fedoseev SV, Ievlev MY, Ershov OV, Lipin KV, Tafeenko VA. Direct synthesis of variously substituted negative photochromes of hydroxytricyanopyrrole (HTCP) series. SYNTHETIC COMMUN 2020. [DOI: 10.1080/00397911.2020.1772822] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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13
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Kometani A, Inagaki Y, Mutoh K, Abe J. Red or Near-Infrared Light Operating Negative Photochromism of a Binaphthyl-Bridged Imidazole Dimer. J Am Chem Soc 2020; 142:7995-8005. [PMID: 32267153 DOI: 10.1021/jacs.0c02455] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The development of red or near-infrared light (NIR) switchable photochromic molecules is required for an efficient utilization of sunlight and regulation of biological activities. While the photosensitization of photochromic molecules to red or NIR light has been achieved by a two-photon absorption process, the development of a molecule itself having sensitivity to red or NIR light has been now a challenging study. Herein, we developed an efficient molecular design for realizing red or NIR-light-responsive negative photochromism based on binaphthyl-bridged imidazole dimers. The introduction of electron-donating substituents shows the red shift of the absorption band at the visible-light region because of the contribution of a charge-transfer transition. Especially, the introduction of a di(4-methoxyphenyl)amino group (TPAOMe) and a perylenyl group largely shifts the absorption edge of the stable colored form to 900 nm. In addition, because the absorption band of one of the derivatives substituted with TPAOMe covers the whole visible-light region, the colored form shows a neutral gray color. Upon red (660 nm) or NIR-light (790 nm) irradiation, we observed the negative photochromic reaction from the stable colored form to the metastable colorless form. Therefore, the substituted binaphthyl-bridged imidazole dimers constitute the attractive photoswitches within a biological window.
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Affiliation(s)
- Aya Kometani
- Department of Chemistry, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5258, Japan
| | - Yuki Inagaki
- Department of Chemistry, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5258, Japan
| | - Katsuya Mutoh
- Department of Chemistry, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5258, Japan
| | - Jiro Abe
- Department of Chemistry, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5258, Japan
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14
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Tokunaga A, Uriarte LM, Mutoh K, Fron E, Hofkens J, Sliwa M, Abe J. Photochromic Reaction by Red Light via Triplet Fusion Upconversion. J Am Chem Soc 2019; 141:17744-17753. [DOI: 10.1021/jacs.9b08219] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ayako Tokunaga
- Department of Chemistry, School of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5258, Japan
| | - Lucas Martinez Uriarte
- Univ. Lille, CNRS, UMR 8516, LASIR, Laboratoire de Spectrochimie
Infrarouge et Raman, F59 000 Lille, France
| | - Katsuya Mutoh
- Department of Chemistry, School of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5258, Japan
| | - Eduard Fron
- Leuven Chem&Tech: Molecular Imaging and Photonics (MIP), KU Leuven, Celestijnenlaan 200F, P.O. Box 2404, 3001 Leuven, Belgium
| | - Johan Hofkens
- Leuven Chem&Tech: Molecular Imaging and Photonics (MIP), KU Leuven, Celestijnenlaan 200F, P.O. Box 2404, 3001 Leuven, Belgium
| | - Michel Sliwa
- Univ. Lille, CNRS, UMR 8516, LASIR, Laboratoire de Spectrochimie
Infrarouge et Raman, F59 000 Lille, France
| | - Jiro Abe
- Department of Chemistry, School of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5258, Japan
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15
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Belikov MY, Ievlev MY, Fedoseev SV, Ershov OV. Novel group of negative photochromes containing a nitrile-rich acceptor: synthesis and photochromic properties. RESEARCH ON CHEMICAL INTERMEDIATES 2019. [DOI: 10.1007/s11164-019-03853-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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16
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Liu Y, Wang QL, Chen Z, Chen P, Tang KW, Zhou Q, Xie J. Visible-light-induced cascade sulfonylation/cyclization of N-propargylindoles with aryldiazonium tetrafluoroborates via the insertion of sulfur dioxide. Org Biomol Chem 2019; 17:10020-10029. [DOI: 10.1039/c9ob02102g] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A simple and efficient visible-light-catalyzed cascade sulfonylation/cyclization of N-propargylindoles with K2S2O5 and aryldiazonium tetrafluoroborates for the construction of 2-sulfonyl-substituted 9H-pyrrolo[1,2-a]indoles is developed.
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Affiliation(s)
- Yu Liu
- Department of Chemistry and Chemical Engineering
- Hunan Institute of Science and Technology
- Yueyang 414006
- China
| | - Qiao-Lin Wang
- Department of Chemistry and Chemical Engineering
- Hunan Institute of Science and Technology
- Yueyang 414006
- China
| | - Zan Chen
- Department of Chemistry and Chemical Engineering
- Hunan Institute of Science and Technology
- Yueyang 414006
- China
| | - Pu Chen
- Department of Chemistry and Chemical Engineering
- Hunan Institute of Science and Technology
- Yueyang 414006
- China
| | - Ke-Wen Tang
- Department of Chemistry and Chemical Engineering
- Hunan Institute of Science and Technology
- Yueyang 414006
- China
| | - Quan Zhou
- Department of Chemistry and Chemical Engineering
- Hunan Institute of Science and Technology
- Yueyang 414006
- China
| | - Jun Xie
- Department of Chemistry and Chemical Engineering
- Hunan Institute of Science and Technology
- Yueyang 414006
- China
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