論文 - 関口 龍太
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Synthesis, Structural, and Optical Properties of Azuleno[1,2-c]pyran-1-ones: Bro̷nsted Acid-Mediated Cyclization of 2-Azulenylalkynes
Shoji Taku, Sasahara Nichika, Hamasaki Atom, Mori Shigeki, Okujima Tetsuo, Sekiguchi Ryuta, Ito Shunji
The Journal of Organic Chemistry 88 ( 22 ) 15739 - 15749 2023年10月
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Synthesis of Azuleno[2,1-b]quinolones and Quinolines via Brønsted Acid-Catalyzed Cyclization of 2-Arylaminoazulenes
Shoji Taku, Takeuchi Mutsumi, Uda Mayumi, Ariga Yukino, Yamazaki Akari, Sekiguchi Ryuta, Ito Shunji
Molecules 28 5785 2023年07月
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Synthesis of 2‐Perfluoroalkylazuleno[2,1‐d]pyrimidin‐4(3H)‐ones via Brønsted Acid‐Mediated Intramolecular Cyclization and Transformation into Pyrimidines
Shoji Taku, Ariga Yukino, Sakata Naoko, Ando Daichi, Mori Shigeki, Okujima Tetsuo, Sekiguchi Ryuta, Ito Shunji
Advanced Synthesis & Catalysis in press 2023年07月
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Synthesis of Maleimide-Fused Aceheptylenes from Guaiazulene
Shoji Taku, Uda Mayumi, Okujima Tetsuo, Sekiguchi Ryuta, Ito Shunji
Heterocycles 106 ( 4 ) 641 - 648 2023年03月
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Construction of 2,2’-biazulene framework via Brønsted acid-promoted annulation of 2,3-di(1-azulenyl)benzofurans
Shoji Taku, Sakata Naoko, Ariga Yukino, Yamazaki Akari, Katoh Ryuzi, Okujima Tetsuo, Sekiguchi Ryuta, Ito Shunji
Chemical Communications 59 3447 - 3450 2023年02月
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Bis(3-methylthio-1-azulenyl)phenylmethyl Cations and Dications Connected by a 1,4-Phenylene Spacer: Synthesis and Their Electrochemical Properties
Shoji Takui, Sakata Naoko, Sekiguchi Ryuta, Ito Shunji
Organics 3 ( 4 ) 507 - 519 2022年12月
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Benz[a]azulenequinones: Reaction of Benz[a]azulenes with Pyridinium Hydrobromide Perbromide
Shoji Taku, Yamazaki Akari, Sakata Naoko, Sekiguchi Ryuta, Ito Shunji, Yasunami Masafumi
Molbank 2022 ( 4 ) M1467 2022年10月
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Synthesis of phthalimides cross-conjugated with an azulene ring, and their structural, optical and electrochemical properties
Shoji Taku, Iida Nanami, Yamazaki Akari, Ariga Yukino, Ohta Akira, Sekiguchi Ryuta, Nagahata Tatsuki, Nagasawa Takuya, Ito Shunji
ORGANIC & BIOMOLECULAR CHEMISTRY 18 ( 12 ) 2274 - 2282 2020年03月
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Molecular Transformation to Pyrroles, Pentafulvenes, and Pyrrolopyridines by [2+2] Cycloaddition of Propargylamines with Tetracyanoethylene
Shoji Taku, Takagaki Sho, Ariga Yukino, Yamazaki Akari, Takeuchi Mutsumi, Ohta Akira, Sekiguchi Ryuta, Mori Shigeki, Okujima Tetsuo, Ito Shunji
CHEMISTRY-A EUROPEAN JOURNAL 26 ( 9 ) 1931 - 1935 2020年02月
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Synthesis of azuleno[2,1-b]thiophenes by cycloaddition of azulenylalkynes with elemental sulfur and their structural, optical and electrochemical properties
Shoji Taku, Miura Kota, Ohta Akira, Sekiguchi Ryuta, Ito Shunji, Endo Yuya, Nagahata Tatsuki, Mori Shigeki, Okujima Tetsuo
ORGANIC CHEMISTRY FRONTIERS 6 ( 15 ) 2801 - 2811 2019年08月
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Preparation of a large-sized highly flexible carbon nanohoop
Nakagawa Yuta, Sekiguchi Ryuta, Kawakami Jun, Ito Shunji
ORGANIC & BIOMOLECULAR CHEMISTRY 17 ( 28 ) 6843 - 6853 2019年07月
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Synthesis of 6-Amino- and 6-Arylazoazulenes via Nucleophilic Aromatic Substitution and Their Reactivity and Properties
Shoji Taku, Sugiyama Shuhei, Takeuchi Mutsumi, Ohta Akira, Sekiguchi Ryuta, Ito Shunji, Yatsu Tomoaki, Okujima Tetsuo, Yasunami Masafumi
JOURNAL OF ORGANIC CHEMISTRY 84 ( 3 ) 1257 - 1275 2019年02月
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Synthesis of azulenophthalimides by phosphine-mediated annulation of 1,2-diformylazulenes with maleimides
Shoji Taku, Araki Takanori, Iida Nanami, Miura Kota, Ohta Akira, Sekiguchi Ryuta, Ito Shunji, Okujima Tetsuo
ORGANIC CHEMISTRY FRONTIERS 6 ( 2 ) 195 - 204 2019年01月
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Synthesis and photophysical properties of azuleno[1 ',2 ':4,5]pyrrolo[2,1-b]quinazoline-6,14-diones: Azulene analogs of tryptanthrin
Kogawa Chieko, Fujiwara Asuka, Sekiguchi Ryuta, Shoji Taku, Kawakami Jun, Okazaki Masaaki, Ito Shunji
TETRAHEDRON 74 ( 49 ) 7018 - 7029 2018年12月
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SYNTHESIS OF 2-AMINO-1-CYANOAZULENES: SUBSTITUENT EFFECT ON 2H-CYCLOHEPTA[b]FURAN-2-ONES TOWARD THE REACTION WITH MALONONITRILE
Shoji Taku, Sugiyama Shuhei, Miura Kota, Ohta Akira, Sekiguchi Ryuta, Ito Shunji, Mori Shigeki, Okujima Tetsuo
HETEROCYCLES 97 ( 2 ) 1068 - 1081 2018年09月
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Synthesis of 2-Methyl-1-azulenyl Tetracyanobutadienes and Dicyanoquinodimethanes: Substituent Effect of 2-Methyl Moiety on the Azulene Ring toward the Optical and Electrochemical Properties
Shoji Taku, Miura Kota, Araki Takanori, Maruyama Akifumi, Ohta Akira, Sekiguchi Ryuta, Ito Shunji, Okujima Tetsuo
JOURNAL OF ORGANIC CHEMISTRY 83 ( 12 ) 6690 - 6705 2018年06月
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Molecular Transformation of 2-Methylazulenes: An Efficient and Practical Synthesis of 2-Formyl- and 2-Ethynylazulenes
Shoji Taku, Araki Takanori, Iida Nanami, Kobayashi Yoshiaki, Ohta Akira, Sekiguchi Ryuta, Ito Shunji, Mori Shigeki, Okujima Tetsuo, Yasunami Masafumi
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY 2018 ( 9 ) 1145 - 1157 2018年03月
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Synthesis of azulene-substituted benzofurans and isocoumarins via intramolecular cyclization of 1-ethynylazulenes, and their structural and optical properties
Shoji Taku, Tanaka Miwa, Takagaki Sho, Miura Kota, Ohta Akira, Sekiguchi Ryuta, Ito Shunji, Moric Shigeki, Okujima Tetsuo
ORGANIC & BIOMOLECULAR CHEMISTRY 16 ( 3 ) 480 - 489 2018年01月
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Cyanine-cyanine hybrid structure as a stabilized polyelectrochromic system: synthesis, stabilities, and redox behavior of di(1-azulenyl)methylium units connected with electron-accepting pi-electron systems
Ito Shunji, Sekiguchi Ryuta, Mizushima Akira, Kudo Kohei, Kawakami Jun, Shoji Taku
ARKIVOC 145 - 169 2018年
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SYNTHESIS OF AZULENE-SUBSTITUTED TETRAARYLPYRROLES BY REACTION OF 1-AZULENYL KETONES WITH BENZOIN AND AMMONIUM ACETATE
Shoji Taku, Takagaki Sho, Tanaka Miwa, Araki Takanori, Sugiyama Shuhei, Sekiguchi Ryuta, Ohta Akira, Ito Shunji, Okujima Tetsuo
HETEROCYCLES 94 ( 10 ) 1870 - 1883 2017年10月