Papers - ITO SHUNJI
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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
T. Shoji, Y. Ariga, N. Sakata, D. Ando, S. Mori, T. Okujima, R. Sekiguchi, and S. Ito
Adv. Synth. Catal. 365 ( 21 ) 3648 - 3657 2023.11
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Synthesis, Structural, and Optical Properties of Azuleno[1,2 c]pyran 1-ones: Bronsted Acid-Mediated Cyclization of 2-Azulenylalkynes
T. Shoji, N. Sasahara, A. Hamasaki, S. Mori, T. Okujima, R. Sekiguchi, and S. Ito
J. Org. Chem. 88 ( 22 ) 15739 - 15749 2023.10
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Aggregation-induced Emission and Solid-State Fluorescence of 2-(4-(N,N-diphenylamino)phenyl)tryptanthrin
J. Kawakami, M. Harada, Y. Akagi, M. Takahashi, S. Ohta, and S. Ito
Journal of the Japan Society of Colour Material 96 ( 15 ) 333 - 337 2023.10
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Synthesis of Azuleno[2,1-b]quinolones and Quinolines via Brønsted Acid-Catalyzed Cyclization of 2-Arylaminoazulenes
T. Shoji, M. Takeuchi, M. Uda, Y. Ariga, A. Yamazaki, R. Sekiguchi, and S. Ito
Molecules 28 ( 15 ) 5785 2023.8
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Synthesis of Maleimide-fused Aceheptylenes from Guaiazulene
T. Shoji, M. Uda, T. Okujima, R. Sekiguchi, and S. Ito
Heterocycles 106 ( 4 ) 641 - 648 2023.4
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Construction of 2,2’-Biazulene Framework via Brønsted Acid Promoted Annulation of 2,3-Di(1-azulenyl)benzofurans
T. Shoji, N. Sakata, Y. Ariga, A. Yamazaki, R. Katoh, T. Okujima, R. Sekiguchi, and S. Ito
Chem. Commun. 59 ( 23 ) 3447 - 3450 2023.3
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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
T. Shoji, N. Sakata, R. Sekiguchi, and S. Ito
Organics 3 ( 4 ) 507 - 519 2022.12
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Benz[a]azulenequinones: Reaction of Benz[a]azulenes with Pyridinium Hydrobromide Perbromide
T. Shoji, A. Yamazaki, N. Sakata, R. Sekiguchi, S. Ito, and M. Yasunami
Molbank 2022 ( 4 ) M1467 2022.12
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Fluorescence Based on Excited-State Intramolecular Proton Transfer of 1-(2-Benzothiazolyl)-2-hydroxytryptanthrin
J. Kawakami, M. Takahashi, and S. Ito
Journal of the Japan Society of Colour Material 95 ( 7 ) 185 - 188 2022.7
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Azuleno[6,5-b]indoles: Palladium-Catalyzed Oxidative Ring-Closing Reaction of 6-(Arylamino)azulenes
T. Shoji, Y. Ariga, S. Ito, and M. Yasunami
Heterocycles 105 ( 1 ) 383 - 396 2022.6
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Synthesis of 8-Aryl-2H-cyclohepta[b]furan-2-ones and Transformation into 4-Arylazulenes
T. Shoji, D. Ando, A. Yamazaki, Y. Ariga, A. Hamasaki, S. Mori, T. Okujima, and S. Ito
Chem. Lett. 51 ( 5 ) 533 - 537 2022.5
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Synthesis, Reactivity, and Properties of Benz[a]azulenes via the [8 + 2] Cycloaddition of 2H-Cyclohepta[b]furan-2-ones with an Enamine
T. Shoji, A. Yamazaki, R. Katoh, K. Shimamura, R. Sakai, M. Yasunami, T. Okujima, and S. Ito
J. Org. Chem. 87 ( 9 ) 5827 - 5845 2022.5
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Azulene-Substituted Donor-Acceptor Polymethines and 1,6’-Bi-, 1,6’;3,6’’-Ter-, and Quinqueazulenes via Zincke Salts: Synthesis, and Structural, Optical, and Electrochemical Properties
T. Shoji, A. Yamazaki, Y. Ariga, M. Uda, D. Ando, N. Sasahara, N. Kai, and S. Ito
ChemPlusChem 86 ( 6 ) 946 - 966 2021.6
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Solid-State Fluorescence of Tryptanthrin Analogs
J. Kawakami, C. Osanai, S. Ohta, and S. Ito
Transactions of the Materials Research Society of Japan (Trans. Mat. Res. Soc. Japan) 46 ( 1 ) 45 - 48 2021.3
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Synthesis, Photophysical and Electrochemical Properties of 1-, 2-, and 6-(2-Benzofuryl)azulenes
T. Shoji, Y. Ariga, A. Yamazaki, M. Uda, T. Nagasawa, and S. Ito
Bull. Chem. Soc. Jpn. 94 ( 3 ) 1000 - 1009 2021.3
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Synthesis of Thiophene-fused Heptalenes by Cycloaddition of Azulenothiophenes with Dimethyl Acetylenedicarboxylate
T. Shoji, K. Miura, Y. Ariga, A. Yamazaki, S. Ito, and M. Yasunami
Sci. Rep. 10 12477 2020.7
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Synthesis of Phthalimides Cross-Conjugated with An Azulene Ring, and their Structural, Optical and Electrochemical Properties
T. Shoji, N. Iida, A. Yamazaki, Y. Ariga, A. Ohta, R. Sekiguchi, T. Nagahata, T. Nagasawa, and S. Ito
Org. Biomol. Chem. 18 ( 12 ) 2274 - 2282 2020.3
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Photophysical Properties of 2-Hydroxytryptanthrin Analog as a Near-Infrared Dye for Fluorescent Imaging
J. Kawakami, C. Osanai, and S. Ito
Transactions of the Materials Research Society of Japan (Trans. Mat. Res. Soc. Japan) 45 ( 1 ) 19 - 22 2020.2
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Molecular Transformation to Pyrroles, Pentafulvenes, and Pyrrolopyridines by [2 + 2] Cycloaddition of Propargylamines with Tetracyanoethylene
T. Shoji, S. Takagaki, Y. Ariga, A. Yamazaki, M. Takeuchi, A. Ohta, R. Sekiguchi, S. Mori, T. Okujima, and S. Ito
Chem. Eur. J. 2020.2
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Direct synthesis of 2-arylazulenes by [8 + 2] cycloaddition of 2H-cyclohepta[b]furan-2-ones with silyl enol ethers
T. Shoji, S. Sugiyama, Y. Kobayashi, A. Yamazaki, Y. Ariga, R. Kato, H. Wakui, M. Yasunami, and S. Ito
Chem. Commun. 56 ( 10 ) 1485 - 1488 2020.2
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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
T. Shoji, K. Miura, A. Ohta, R. Sekiguchi, S. Ito, Y. Endo, T. Nagahata, S. Mori, and T. Okujima
Org. Chem. Front. 6 ( 15 ) 2801 - 2811 2019.8
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Aggregation-induced Emission Properties of 2-(N,N-diphenylamino)tryptanthrin
J. Kawakami, M. Harada, and S. Ito
Transactions of the Materials Research Society of Japan (Trans. Mat. Res. Soc. Japan) 44 ( 4 ) 153 - 156 2019.8
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Preparation of a Large-sized Highly Flexible Carbon Nanohoop
Y. Nakagawa, R. Sekiguchi, J. Kawakami, and S. Ito
Org. Biomol. Chem. 17 ( 28 ) 6843 - 6853 2019.7
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Benzo-fused BODIPY Derivative as a Fluorescent Chemosensor for Fe3+, Cu2+, and Al3+
J. Kawakami, Y. Sasaki, K. Yanase, and S. Ito
Transactions of the Materials Research Society of Japan (Trans. Mat. Res. Soc. Japan) 44 ( 2 ) 69 - 73 2019.4
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Synthesis of 6‑Amino- and 6‑Arylazoazulenes via Nucleophilic Aromatic Substitution and Their Reactivity and Properties
T. Shoji, S. Sugiyama, M. Takeuchi, A. Ohta, R. Sekiguchi, S. Ito, T. Yatsu, T. Okujima, and M. Yasunami
J. Org. Chem. 84 ( 3 ) 1257 - 1275 2019.2
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Synthesis of Azulenophthalimides by Phosphinemediated Annulation of 1,2-Diformylazulenes with Maleimides
T. Shoji, T. Araki, N. Iida, K. Miura, A. Ohta, R. Sekiguchi, S. Ito, and T. Okujima
Org. Chem. Front. 6 ( 2 ) 195 - 204 2019.1
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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
C. Kogawa, A. Fujiwara, R. Sekiguchi, T. Shoji, J. Kawakami, M. Okazaki, and S. Ito
Tetrahedron 74 ( 49 ) 7018 - 7029 2018.12
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Fluorescence Emission Mechanism of Three N,N-dimethylaminotryptanthrins by Density Functional Theory Calculations
J. Kawakami, C. Osanai, and S. Ito
Transactions of the Materials Research Society of Japan (Trans. Mat. Res. Soc. Japan) 43 ( 5 ) 319 - 323 2018.9
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Synthesis of 2-Methyl-1-azulenyl Tetracyanobutadienes and Dicyanoquinodimethanes: Substituent Effect of 2-Methyl Moiety on Azulene Ring toward the Optical and Electrochemical Properties
T. Shoji, K. Miura, T. Araki, A. Maruyama, A. Ohta, R. Sekiguchi, S. Ito, and T. Okujima
J. Org. Chem. 83 ( 12 ) 6690 - 6705 2018.6
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2-Hydroxy-1-((2-(pyridin-2-yl)hydrazono)methyl)tryptanthrin as a Fluorescent Chemosensor for Metal Ions
J. Kawakami, M. Sasagawa, and S. Ito
Transactions of the Materials Research Society of Japan (Trans. Mat. Res. Soc. Japan) 43 ( 3 ) 209 - 212 2018.6
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Synthesis of 2-Amino-1-cyanoazulenes: Substituent Effect on 2H-Cyclohepta[b]furan-2-ones toward the Reaction with Malononitrile
T. Shoji, S. Sugiyama, K. Miura, A. Ohta, R. Sekiguchi, S. Ito, S. Mori, and T. Okujima
Heterocycles 97 ( 2 ) 1068 - 1081 2018.4
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2-Hydroxytryptanthrin and 1-Formyl-2-hydroxytryptanthrin as Fluorescent Metal-ion Sensors and Near-infrared Fluorescent Labeling Reagents
J. Kawakami, Y. Kinami, M. Takahashi, and S. Ito
Transactions of the Materials Research Society of Japan (Trans. Mat. Res. Soc. Japan) 43 ( 2 ) 109 - 112 2018.4
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Molecular Transformation of 2-Methylazulenes: An Efficient and Practical Synthesis of 2-Formyl- and 2-Ethynylazulenes
T. Shoji, T. Araki, N. Iida, Y. Kobayashi, A. Ohta, R. Sekiguchi, S. Ito, S. Mori, T. Okujima, and M. Yasunami
Eur. J. Org. Chem. ( 9 ) 1145 - 1157 2018.3
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Synthesis of Azulene-substituted Benzofurans and Isocoumarins via Intramolecular Cyclization of 1-Ethynylazulenes, and their Structural and Optical Properties
T. Shoji, M. Tanaka, S. Takagaki, K. Miura, A. Ohta, R. Sekiguchi, S. Ito, S. Mori, and T. Okujima
Org. Biomol. Chem. 15 ( 3 ) 480 - 489 2018.1
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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 π-electron systems
S. Ito, R. Sekiguchi, A. Mizushima, K. Kudo, J. Kawakami, and T. Shoji
Arkivoc ( part ii ) 145 - 169 2017.11
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Synthesis of Azulene-substituted Tetraarylpyrroles by Reaction of 1-Azulenyl Ketones with Benzoin and Ammonium Acetate
T. Shoji, S. Takagaki, M. Tanaka, T. Araki, S. Sugiyama, R. Sekiguchi, A. Ohta, S. Ito, and T. Okujima
Heterocycles 94 ( 18 ) 1870 - 1883 2017.10
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Synthesis of 2-Amino- and 2-Arylazoazulenes via Nucleophilic Aromatic Substitution of 2-Chloroazulenes with Amines and Arylhydrazines
T. Shoji, S. Sugiyama, T. Araki, A. Ohta, R. Sekiguchi, S. Ito, S. Mori, T. Okujima, and M. Yasunami
Org. Biomol. Chem. 15 ( 18 ) 3917 - 3923 2017.5
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Synthesis of 2-Aminofurans by Sequential [2 + 2] Cycloaddition–Nucleophilic Addition of 2-Propyn-1-ols with Tetracyanoethylene and Amine-Induced Transformation to 6-Aminopentafulvenes
T. Shoji, D. Nagai, M. Tanaka, T. Araki, A. Ohta, R. Sekiguchi, S. Ito, S. Mori, and T. Okujima
Chem. Eur. J. 23 ( 21 ) 5126 - 5136 2017.4
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Synthesis of Azulene-substituted Benzofurans and Isocoumarins via Intramolecular Cyclization of 1-Ethynylazulenes
T. Shoji, M. Tanaka, S. Takagaki, K. Miura, A. Ohta, R. Sekiguchi, S. Ito, S. Mori, and T. Okujima
Org. Biomol. Chem. 15 ( 18 ) 3917 - 3923 2017.4
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Synthesis and Electrochemical Properties of Azulene-substituted Tetracyanobutadiene and Dicyanoquinodimethane Chromophores Connected with Naphthalene Cores
T. Shoji, M. Maruyama, A. Maruyama, D. Nagai, M. Tanaka, R. Sekiguchi, S. Ito, and T. Okujima
Heterocycles 95 ( 1 ) 353 - 369 2017.4
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Synthesis of 2-Azulenyltetrathiafulvalenes by Palladium-Catalyzed Direct Arylation of 2-Chloroazulenes with Tetrathiafulvalene and Their Optical and Electrochemical Properties
T. Shoji, T. Araki, S. Sugiyama, A. Ohta, R. Sekiguchi, S. Ito, T. Okujima, and K. Toyota
J. Org. Chem. 82 ( 3 ) 1657 - 1665 2017.2
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Preparation of a Cyclic Polyphenylene Array for a Chiral-Type Carbon Nanotube Segment
R. Sekiguchi, S. Kudo, J. Kawakami, A. Sakai, H. Ikeda, H. Nakamura, K. Ohta, and S. Ito
Bull. Chem. Soc. Jpn. 89 ( 10 ) 1260 - 1275 2016.10
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Synthesis of 1-azulenyl ketones by Brønsted acid mediated hydration of 1-azulenylalkynes
T. Shoji, M. Tanaka, T. Araki, S. Takagaki, R. Sekiguchi, and S. Ito
RSC Adv. 6 ( 82 ) 78303 - 78306 2016.8
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Synthesis of 1,2’-Biazulenes by Palladium-Catalyzed Unusual Homocoupling Reaction of 1-Haloazulenes in the Presence of Ferrocene
T. Shoji, K. Miyashita, T. Araki, M. Tanaka, A. Maruyama, R. Sekiguchi, S. Ito, T. Okujima
Synthesis 48 ( 15 ) 2438 - 2448 2016.8
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Spectral Characteristics of Highly Fluorescent 2-(N,N-dimethylamino)tryptanthrin
J. Kawakami, T. Kadowaki, M. Ikeda, Y. Habata, S. Ito, and H. Kitahara
Transactions of the Materials Research Society of Japan (Trans. MRS-J) 41 ( 2 ) 143 - 146 2016.6
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Naphthalene Ring-Fused 2-Aminotryptanthrin as a Fluorescent Chemosensor for Al3+
J. Kawakami, A. Tsuiki, S. Ito, and H. Kitahara
Transactions of the Materials Research Society of Japan (Trans. MRS-J) 41 ( 1 ) 131 - 133 2016.2
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Photophysical Properties of the 2-Hydroxytryptanthrin and its Sodium Salt as Near-infrared Dyes for Fluorescent Imaging
J. Kawakami, M. Takahashi, S. Ito, and H. Kitahara
Anal. Sci. 32 ( 2 ) 251 - 253 2016.2
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Synthesis and Properties of (3-Phenyl-1-azulenyl)tetracyanobetadienes and Tris(aryltetracyanobetadiene)s Connected with 1,3,5-Tri(1-azulenyl)benzene Core
T. Shoji, A. Maruyama, M. Tanaka, D. Nagai, E. Shimomura, K. Fujimori, S. Ito, T. Okujima, K. Toyota, and M. Yasunami
ChemistrySelect 1 ( 1 ) 49 - 56 2016.1
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Synthesis of 2- and 6-Thienylazulenes by Palladium-catalyzed Direct Arylation of 2- and 6-Haloazulenes with Thiophene Derivatives
T. Shoji, A. Maruyama, S. Ito, and T. Okujima
Org. Biomol. Chem. 13 ( 40 ) 10191 - 10197 2015.10
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Synthesis, Properties, and Redox Behavior of Ferrocenyl-1,1,4,4-tetracyano-1,3-butadienes Connected by Arylamine and Azobenzene Spacers
T. Shoji, N. Kamata, A. Maruyama, S. Ito, and T. Okujima
Bull. Chem. Soc. Jpn. 88 ( 9 ) 1338 - 1346 2015.9
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Preparation of a Cyclic Polyphenylene Array for a Zigzag-Type Carbon Nanotube Segment
R. Sekiguchi, K. Takahashi, J. Kawakami, A. Sakai, H. Ikeda, A. Ishikawa, K. Ohta, and S. Ito
J. Org. Chem. 80 ( 10 ) 5092 - 5110 2015.5
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Synthesis, Properties, and Redox Behavior of Tris(1-azulenyltetracyanobetadiene) and Tris[1-azulenylbis(tetracyanobetadiene)] Chromophores Connected to a 1,3,5-Tri(1-azulenyl)benzene Core
T. Shoji, A. Maruyama, E. Shimomura, D. Nagai, S. Ito, T. Okujima, and K. Toyota
Eur. J. Org. Chem. ( 9 ) 1979 - 1990 2015.3
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Synthesis, Properties, and Redox Behavior of 1,1,4,4-Tetracyano-2-ferrocenyl-1,3-butadienes Connected by Aryl, Biaryl, and Teraryl Spacers
T. Shoji, A. Maruyama, C. Yaku, N. Kamata, S. Ito, T. Okujima, and K. Toyota
Chem. Eur. J. 21 ( 1 ) 402 - 409 2015.1
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Synthesis of 2,6-Diaminoazulenes by the SNAr Reaction with Cyclic Amines
T. Shoji, Y. Fujiwara, A. Maruyama, M. Maruyama, S. Ito, M. Yasunami (the late), R. Yokoyama, and N. Morita
Heterocycles 90 ( 1 ) 136 - 143 2015.1
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Synthesis of 2-Aryl- and 6-Heteroaryl-1,3-di(4-pyridyl)azulenes by Katritzky’s Pyridylation of 2-Aryl- and 6-Heteroarylazulenes
T. Shoji, A. Maruyama, S. Ito, T. Okujima, M. Yasunami, J. Higashi, K. Toyota, and N. Morita
Heterocycles 89 ( 11 ) 2588 - 2603 2014.11
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2-Aminotryptanthrin Derivative with Pyrene as a FRET-based Fluorescent Chemosensor for Metal Ions
J. Kawakami, A. Soma, K. Kikuchi, Y. Kikuchi, S. Ito, and H. Kitahara
Anal. Sci. 30 ( 10 ) 949 - 954 2014.10
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Synthesis of 1,3-Bis(tetracyano-2-azulenyl-3-butadienyl)azulenes by the [2 + 2] Cycloaddition–Retroelectrocyclization of 1,3-Bis(azulenylethynyl)azulenes with Tetracyanoethylene
T. Shoji, M. Maruyama, A. Maruyama, S. Ito, T. Okujima, K. Toyota
Chem. Eur. J. 20 ( 37 ) 11903 - 11912 2014.9
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Synthesis of 2,2’-Diamino-1,1’-biazulenes by the Copper-Catalyzed Homo-Coupling Reaction of 2-Aminoazulenes
T. Shoji, A. Maruyama, A. Yamamoto, Y. Fujiwara, S. Ito, T. Okujima, and N. Morita
Chem. Lett. 43 ( 7 ) 1122 - 1124 2014.7
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Synthesis and Redox Behavior of 1,2-Dihydro-1-oxabenz[a]azulen-2-ones
S. Ito, S. Yamazaki, S. Kudo, R. Sekiguchi, J. Kawakami, M. Takahashi, T. Matsuhashi, K. Toyota, and N. Morita
Tetrahedron 70 ( 17 ) 2796 - 2803 2014.4
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Synthesis, Properties, and Structure of DDQ-adducted 2H-Cyclohepta[b]furan-2-ones
T. Shoji, M. Maruyama, E. Shimomura, A. Maruyama, S. Ito, M. Yasunami, J. Higashi, K. Toyota, and N. Morita
Heterocycles 88 ( 1 ) 319 - 329 2014.1
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Synthesis and Properties of 6-Methoxy- and 6-Dimethylamino-1-methylthio- and 1,3-Bis(methylthio)azulenes and Triflic Anhydride-Mediated Synthesis of Their Biaryl Derivatives
T. Shoji, A. Maruyama, M. Maruyama, S. Ito, T. Okujima, J. Higashi, K. Toyota, and N. Morita
Bull. Chem. Soc. Jpn. 87 ( 1 ) 141 - 154 2014.1
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Synthesis, Properties, and Redox Behavior of Tertacyanobutadiene and Dicyanoquinodimethane Chromophores Bearing Two Azulenyl Substituent
T. Shoji, M. Maruyama, E. Shimomura, A. Maruyama, S. Ito, T. Okujima, K. Toyota, and N. Morita
J. Org. Chem. 78 ( 24 ) 12513 - 12524 2013.12
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Synthesis and Properties of Azulene-substituted Donor–Acceptor Chromophores Connected by Arylamine Cores
T. Shoji, E. Shimomura, M. Maruyama, S. Ito, T. Okujima, K. Toyota, and N. Morita
Eur. J. Org. Chem. ( 34 ) 7785 - 7799 2013.12
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Universality of Molten State of Alkyl Chain in Liquid-Crystalline Mesophases: Smectic E Phase of 6-Alkyl-2-phenylazulene
T. Adachi, H. Saitoh, Y. Yamamura, M. Hishida, M. Ueda, S. Ito, and K. Saito
Bull. Chem. Soc. Jpn. 86 ( 9 ) 1022 - 1027 2013.9
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Structure–Activity Relationship Analysis for Antimicrobial Activities of Tryptanthrin Derivatives Using Quantum Chemical Calculations
J. Kawakami, H. Kakinami, N. Matsushima, A. Nakane, H. Kitahara, M. Nagaki, and S. Ito
J. Comput. Chem. Jpn. 12 ( 2 ) 109 - 112 2013.6
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Synthesis of 1,6’-Bi- and 1,6’:3,6’’-Terazulenes from 1-Pyridyl- and 1,3-Bis(pyridyl)azulenes by Zieglar–Hafner’s Method
T. Shoji, A. Yamamoto, Y. Inoue, E. Shimomura, M. Maruyama, S. Ito, T. Okujima, and N. Morita
Chem. Lett. 42 ( 6 ) 638 - 640 2013.6
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Efficient Synthesis and Redox Behavior of A Series of 6-Alkyl-2-phenylazulenes
S. Ito, M. Ueda, R. Sekiguchi, and J. Kawakami
Tetrahedron 69 ( 21 ) 4259 - 4269 2013.5
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Synthesis of 2-Azulenyl-1,1,4,4-tetracyano-3-ferrocenyl-1,3-butadienes by the [2 + 2] Cycloaddition of (Ferrocenylethynyl)azulenes with Tetracyanoethylene
T. Shoji, S. Ito, T. Okujima, and N. Morita
Chem. Eur. J. 19 ( 18 ) 5721 - 5730 2013.4
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Efficient Synthesis and Redox Behavior of A Series of 6-Alkyl-2-phenylazulenes
S. Ito, M. Ueda, R. Sekiguchi, and J. Kawakami
Tetrahedron 69 ( 21 ) 4259 - 4269 2013.3
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Fluorescent Solvatochromism of 2-Aminotryptanthrin
J. Kawakami, H. Kawaguchi, K. Kikuchi, A. Yamaya, S. Ito, and H. Kitahara
Transactions of the Materials Research Society of Japan (Trans. MRS-J) 38 ( 1 ) 123 - 125 2013.3
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Synthesis of Novel Thiophene-Fused 1,1’-Biazulene Derivative by the Reaction of Azuleno[1,2-b]thiophene with N-Iodosuccinimide
T. Shoji, E. Shimomura, Y. Inoue, M. Maruyama, A. Yamamoto, K. Fujimori, S. Ito, M. Yasunami, and N. Morita
Heterocycles 87 ( 2 ) 303 - 306 2013.2
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Synthesis, Properties and Redox Behavior of Ene–Diyne Scaffolds Bearing 1- and 2-Azulenyl Groups at the Periphery
T. Shoji, E. Shimomura, M. Maruyama, S. Ito, T. Okujima, and N. Morita
Eur. J. Org. Chem. ( 5 ) 957 - 964 2013.2
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8-Hydroxyquinoline Ligands as Fluorescent Chemosensors for Zinc and Cadmium Ions
J. Kawakami, Y. Yamauchi, M. Ohta, and S. Ito
Transactions of the Materials Research Society of Japan (Trans. MRS-J) 37 ( 4 ) 601 - 602 2012.12
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Synthesis and Solvatochromic Properties of Azulene-Substituted Donor–Acceptor-Type Polymethine Dyes
T. Shoji, A. Yamamoto, Y. Inoue, E. Shimomura, S. Ito, J. Higashi, and N. Morita
Chem. Lett. 41 ( 12 ) 1644 - 1646 2012.12
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Comprehensive Characterisation of the E Phase of 6-Octyl-2-phenylazulene
T. Adachi, Y. Yamamura, M. Hishida, M. Ueda, S. Ito, and K. Saito
Liq. Cryst. 39 ( 11 ) 1340 - 1344 2012.11
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Synthesis of Push-Pull Chromophores by the Sequential [2 + 2] Cycloaddition of 1-Azulenylbutadiynes with Tetracyanoethylene and Tetrathiafulvalene
T. Shoji, S. Ito, T. Okujima, and N. Morita
Org. Biomol. Chem. 10 ( 41 ) 8308 - 8313 2012.11
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Synthesis and Properties of Mono-, Bis-, Tris- and Tetrakis[1,1,4,4-tetracyano-2-(1-azulenyl)-1,3-butadien-3-yl] Chromophores Connected to a Benzene Ring by Phenylethynyl- and 2-Thienylethynyl Spacers
T. Shoji, M. Maruyama, S. Ito, and N. Morita
Bull. Chem. Soc. Jpn. 85 ( 7 ) 761 - 773 2012.7
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Synthesis and Redox Behavior of Cyanovinyl–Substituted 2H-Cyclohepta[b]furan-2-ones
T. Shoji, J. Higashi, S. Ito, M. Oda, M. Yasunami, and N. Morita
Heterocycles 86 ( 1 ) 305 - 315 2012.5
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First Synthesis of 1-(Indol-2-yl)azulenes by Vilsmeier–Haack Type Arylation with Triflic Anhydride as an Activating Reagent
T. Shoji, Y. Inoue, and S. Ito
Tetrahedron Lett. 53 ( 12 ) 1493 - 1496 2012.3
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Synthesis of Donor–Acceptor Chromophores by the [2 + 2] Cycloaddition of Arylethynyl-2H-cyclohepta[b]furan-2-ones with 7,7,8,8-Tetracyanoquinodimethane
T. Shoji, J. Higashi, S. Ito, T. Okujima, M. Yasunami, and N. Morita
Org. Biomol. Chem. 10 ( 12 ) 2431 - 2438 2012.3
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First Synthesis of 2-Heteroarylazulenes by the Electrophilic Substitution of Azulene with Triflate of N-Containing Heterocycles
T. Shoji, Y. Inoue, S. Ito T. Okujima, and N. Morita
Heterocycles 85 ( 1 ) 35 - 41 2012.1
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Antibacterial and Antifungal Activities of Tryptanthrin Derivatives
J. Kawakami, N. Matsushima, Y. Ogawa, H. Kakinami, A. Nakane, H. Kitahara, M. Nagaki, and S. Ito
Transactions of the Materials Research Society of Japan (Trans. MRS-J) 36 ( 4 ) 603 - 606 2011.12
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Synthesis and [2+2] Cycloaddition with Tetracyanoethylene of Ene–Diyne Scaffolds Bearing Ferrocenes at the Periphery
T. Shoji, S. Ito, T. Okujima, and N. Morita
Eur. J. Org. Chem. ( 26 ) 5134 - 5140 2011.9
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The [2+2] Cycloaddition Reaction of Ethynylated 2H-Cyclohepta[b]furan-2-ones with 2,3-Dichloro-5,6-dicyano-1,4-benzoquinone
T. Shoji, J. Higashi, S. Ito, M. Yasunami, and N. Morita
Heterocycles 83 ( 10 ) 2271 - 2274 2011.9
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Synthesis of 1-Heteroaryl- and 1,3-Bis(heteroaryl)azulenes: Electrophilic Heteroarylation of Azulenes with the Triflate of N-Containing Heteroarenes
T. Shoji, S. Ito, J. Higashi, and N. Morita
Eur. J. Org. Chem. ( 27 ) 5311 - 5322 2011.9
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Synthesis of Redox-Active Intramolecular Charge-Transfer Chromophores by the [2+2] Cycloaddition of Ethynylated 2H-Cyclohepta[b]furan-2-ones with Tetracyanoethylene
T. Shoji, J. Higashi, S. Ito, T. Okujima, M. Yasunami, and N. Morita
Chem. Eur. J. 17 ( 18 ) 5116 - 5129 2011.4
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TD-DFT Study on the Fluorescent Chemosensor for Hg2+, 2-(Benzo-d-thiazol-2-yl)quinolone
R. Miyamoto, J. Kawakami, R. Ohtake, M. Nagaki, and S. Ito
J. Mol. Struct. 991 ( 1-3 ) 73 - 78 2011.4
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Synthesis and Redox Behavior of Bis(3-methylthio-1-azulenyl)methyl Cations and Dications Connected by 2-Thienyl and 2,5-Thiophenediyl Spacers
T. Shoji, J. Higashi, S. Ito, T. Okujima, and N. Morita
Eur. J. Org. Chem. ( 3 ) 584 - 592 2011.1
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Antibacterial Activity of Radial Compounds with Peripheral Quaternary Ammonium Units
J. Kawakami, I. Harada, A. Nakane, H. Kitahara, M. Nagaki, and S. Ito
Transactions of the Materials Research Society of Japan (Trans. MRS-J) 35 ( 4 ) 885 - 887 2010.12
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Poly(amide amine) Dendrimers with Naphthyl Units as Fluorescent Chemosensor Materials for Metal Cations
J. Kawakami, Y. Miyamoto, T. Isobe, M. Nagaki, and S. Ito
Transactions of the Materials Research Society of Japan (Trans. MRS-J) 35 ( 4 ) 849 - 852 2010.12
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Synthesis and Liquid Crystalline Behavior of Azulene-based Liquid Crystals with 6-Hexadecyl Substituents on Each Azulene Ring
K. Nakagawa, T. Yokoyama, K. Toyota, N. Morita, S. Ito, S. Tahata, M. Ueda, J. Kawakami, M. Yokokawa, Y. Kanai, and K. Ohta
Tetrahedron 66 ( 42 ) 8304 - 8312 2010.10
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Synthesis, Properties, and Redox Behavior of Ferrocene-substituted Bis(3-methylthio-1-azulenyl)methylium Ions
T. Shoji, J. Higashi, S. Ito, and N. Morita
Eur. J. Inorg. Chem. ( 30 ) 4886 - 4891 2010.10
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Synthesis of 1-(Pyridyl, quinolyl, and isoquinolyl)azulenes by Reissert-Henze Type Reaction
T. Shoji, K. Okada, S. Ito, K. Toyota, and N. Morita
Tetrahedron Lett. 51 ( 39 ) 5127 - 5130 2010.9
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Synthesis of 5-Heteroaryl- and 5,7-Bis(heteroaryl)azulenes by Electrophilic Substitution of 1,3-Di-tert-butylazulene with Triflates of N-Containing Heterocycles
T. Shoji, S. Ito, K. Toyota, and N. Morita
Eur. J. Org. Chem. ( 6 ) 1059 - 1069 2010.2
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2-Aminotryptanthrin Derivative with Pyrene as a FRET-based Fluorescent Chemosensor for Al3+
J. Kawakami, K. Kikuchi, K. Chiba, N. Matushima, A. Yamaya, S. Ito, M. Nagaki, and H. Kitahara
Anal. Sci. 25 ( 12 ) 1385 - 1386 2009.12
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Synthesis and Properties of Ferrocenylmethylene-Bridged Calix[4]azulene and a New Example of Bis(1-azulenyl)ferrocenylmethylium Ion
T. Shoji, J. Higashi, S. Ito, K. Toyota, T. Iwamoto, and N. Morita
Eur. J. Org. Chem. ( 34 ) 5948 - 5952 2009.12
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Toward the Preparation of Electrochromic Materials with Strong Absorption in the Near Infrared Region: Synthesis and Redox Behavior of Azulene-Substituted Enediyne Scaffoldings Connected by 9,10-Anthracenediyl Spacer
S. Ito, T. Iida, J. Kawakami, T. Okujima, and N. Morita
Eur. J. Org. Chem. ( 31 ) 5355 - 5364 2009.11
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Reactions between 1-Ethynylazulenes and 7,7,8,8-Tetracyanoquinodimethane (TCNQ): Preparation, Properties, and Redox Behavior of Novel Azulene-Substituted Redox-Active Chromophores
T. Shoji, S. Ito, K. Toyota, M. Yasunami, and N. Morita
Eur. J. Org. Chem. ( 25 ) 4316 - 4324 2009.9
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Synthesis and Redox Behavior of 1,3-Bis(methylthio-) and 1,3-Bis(phenylthio)azulenes Bearing 2- and 3-Thienyl Substituents by Palladium-catalyzed Cross-Coupling Reaction of 2- and 6-Haloazulenes with Thienylmagnesium Ate-complexes
T. Shoji, S. Ito, K. Toyota, T. Iwamoto, M. Yasunami, and N. Morita
Eur. J. Org. Chem. ( 25 ) 4307 - 4315 2009.9
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Synthesis and Redox Behavior of Ene-diyne Scaffolds that Bears Ferrocenes at the Periphery
T. Shoji, S. Ito, K. Toyota, and N. Morita
Tetrahedron Lett. 50 ( 23 ) 2825 - 2827 2009.6
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Electrophilic Ipso-Substitution and Some Unique Reaction Behavior of 1,3,6-Tri-tert-butylazulene
T. Shoji, S. Ito, J. Higashi, T. Okujima, R. Yokoyama, K. Toyota, S. Ito, M. Yasunami, and N. Morita
Eur. J. Org. Chem. ( 10 ) 1554 - 1563 2009.4
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Heteroarylation of 1-Azulenyl Methyl Sulfide: Two-Step Synthetic Strategy for 1-Methylthio-3-(heteroaryl)azulenes Using the Triflate of N-Containing Heterocycles
J. Higashi, T. Shoji, S. Ito, K. Toyota, M. Yasunami, and N. Morita
Eur. J. Org. Chem. ( 34 ) 5823 - 5831 2008.12
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Synthesis, Properties, and Redox Behavior of Mono-, Bis-, and Tris[1,1,4,4-tetracyano-2-(1-azulenyl)-3-butadienyl] Chromophores Binding with Benzene and Thiophene Cores
T. Shoji, S. Ito, K. Toyota, M. Yasunami, and N. Morita
Chem. Eur. J. 14 ( 27 ) 8398 - 8408 2008.9
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Synthesis and Reactivity of 3-Methylsulfinyl-2H-cyclohepta[b]furan-2-ones
J. Higashi, K. Okada, T. Shoji, K. Toyota, M. Watanabe, M. Yasunami, S. Kikuchi, S. Ito, and N. Morita
Heterocycles 76 ( 1 ) 759 - 770 2008.9
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Synthesis and Intramolecular Pericyclization of 1-Azulenyl Thioketones
S. Ito, T. Okujima, S. Kikuchi, T. Shoji, N. Morita, T. Asao, T. Ikoma, S. Tero-Kubota, J. Kawakami, and A. Tajiri
J. Org. Chem. 73 ( 6 ) 2256 - 2263 2008.3
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Synthesis and Redox Behaviors of 1-Azulenyl Sulfides and Efficient Synthesis of 1,1’-Biazulenes
T. Shoji, J. Higashi, S. Ito, K. Toyota, T. Asao, M. Yasunami, K. Fujimori, and N. Morita
Eur. J. Org. Chem. ( 7 ) 1242 - 1252 2008.3
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2-(Benzo-d-thiazol-2-yl)quinoline as a Fluorescent Chemosensor Material for Hg(II)
J. Kawakami, R. Ohtake, R. Miyamoto, M. Nagaki, and S. Ito
Transactions of the Materials Research Society of Japan (Trans. MRS-J) 33 ( 1 ) 9 - 11 2008.3
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A Novel Approach to 5,5’-Diisopropyl-3,3’-bi-2H-cyclohepta[b]furan-2-one
N. Morita, J. Higashi, K. Okada, T. Shoji, K. Toyota, M. Watanabe, M. Yasunami, S. Kikuchi, and S. Ito
Heterocycles 73 ( 1 ) 237 - 240 2007.12
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Transition Metal Free Synthesis and Pyridinylation of 1,1-Biazulene
T. Shoji, S. Ito, K. Toyota, M. Yasunami, and N. Morita
Tetrahedron Lett. 48 ( 29 ) 4999 - 5002 2007.7
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Charge Transfer Induced Enhancement of Near-IR Two-Photon Absorption of 5,15-Bis(azulenylethynyl) Zinc(II) Porphyrins
K. S. Kim, S. B. Noh, T. Katsuda, S. Ito, A. Osuka, and D. Kim
Chem. Commun. ( 24 ) 2479 - 2481 2007.6
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Synthesis of 5-Heteroarylazulenes: First Selective Electrophilic Substitution for 5-Position of Azulene
T. Shoji, S. Ito, M. Watanabe, K. Toyota, M. Yasunami, and N. Morita
Tetrahedron Lett. 48 ( 17 ) 3009 - 3012 2007.4
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Synthesis of Heteroarylazulenes: Transition-Metal Free Coupling Strategy of Azulene with Heterocycles
T. Shoji, R. Yokoyama, S. Ito, M. Watanabe, K. Toyota, M. Yasunami, and N. Morita
Tetrahedron Lett. 48 ( 7 ) 1099 - 1103 2007.2
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Synthesis, Stabilities, and Redox Behavior of Mono-, Di-, and Tetracations Composed of Di(1-azulenyl)methylium Units Connected to a Benzene Ring by Phenyl- and 2-Thienylacetylene Spacers. A Concept of a Cyanine-Cyanine Hybrid as a Stabilized Electrochromic System
S. Ito, K. Akimoto, J. Kawakami, A. Tajiri, T. Shoji, H. Satake, and N. Morita
J. Org. Chem. 72 ( 1 ) 162 - 172 2007.1
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Reaction of 2H-Cyclohepta[b]furan-2-ones with Pyridinium Salts of Trifluoromethanesulfonic Anhydride
N. Morita, T. Matsuki, M. Nakashima, T. Shoji, K. Toyota, S. Kikuchi, and S. Ito
Heterocycles 69 ( 1 ) 119 - 122 2006.12
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Poly(amine ester) Dendrimer with Naphthyl Units as a Fluorescent Chemosensor for Al(III), Cu(II), and Zn(II)
J. Kawakami, T. Mizuguchi, and S. Ito
Anal. Sci. 22 ( 11 ) 1383 - 1384 2006.11
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Time-dependent DFT Study of Emission Mechanism of 8-Hydroxyquinoline Derivatives as Fluorescent Chemosensors for Metal Ions
R. Miyamoto, J. Kawakami, S. Takahashi, S. Ito, M. Nagaki, and H. Kitahara
J. Comput. Chem. Jpn. 5 ( 3 ) 19 - 22 2006.3
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The Synthesis of Heteroarylazulene
T. Shoji, S. Kikuchi, S. Ito, and N. Morita
Heterocycles 66 ( 1 ) 91 - 94 2005.12
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Poly(amide amine) Dendrimer with Naphthyl Units as a Fluorescent Chemosensor for Metal Ions
J. Kawakami, T. Isobe, Y. Sasaki, S. Ito, M. Nagaki, and H. Kitahara
Anal. Sci. 21 ( 7 ) 729 - 730 2005.7
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Synthesis and Properties of Hexakis(6-octyl-2-azulenyl)benzene as a Multielectron Redox System with Liquid Crystalline Behavior
S. Ito, M. Ando, A. Nomura, N. Morita, C. Kabuto, H. Mukai, K. Ohta, J. Kawakami, A. Yoshizawa, and A. Tajiri
J. Org. Chem. 70 ( 10 ) 3939 - 3949 2005.5
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Synthesis and Dynamic Stereochemistry of Azulene-Substituted 9-Fluorenyl, 9,10-Dihydro-10,10-dimethyl-9-anthryl, 10,11-Dihydro-5H-dibenzo[a,d]cyclohepten-5-yl, and 5H-Dibenzo[a,d]cyclohepten-5-yl Cations. Correlations of Stabilities of the Carbocations and Rotational Barrier of Azulene Ring
S. Ito, J. Kawakami, A. Tajiri, D. Ryuzaki, N. Morita, T. Asao, M. Watanabe, and N. Harada
Bull. Chem. Soc. Jpn. 78 ( 11 ) 2051 - 2065 2005.4
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Azulene-Substituted Aromatic Amines. Synthesis and Amphoteric Redox Behavior of N,N-Di(6-azulenyl)-p-toluidine and N,N,N',N'-Tetra(6-azulenyl)-p-phenylene- diamine and their Derivatives
S. Ito, T. Kubo, N. Morita, T. Ikoma, S. Tero-Kubota, J. Kawakami, and A. Tajiri
J. Org. Chem. 70 ( 6 ) 2285 - 2293 2005.3
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A Practical Spectroscopic and Theoretical Approach to Study the Electrochromism in Molecular-Based Materials: The Case of a Family of Dendrimeric-Like Poly(6-azulenylethynyl)benzenes
J. Casado, R. P. Ortiz, J. T. L. Navarrete, S. Ito, and N. Morita
J. Phys. Chem. B 108 ( 48 ) 18463 - 18471 2004.12
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Synthesis of Azulen-3-ylheterocyclic Using 2-(1-Methoxycarbonylazulen-3-yl)ethynyltriphenylphosphonium Bromide
N. Morita, S. Moriyama, T. Shoji, M. Nakashima, M. Watanabe, S. Kikuchi, S. Ito, and K. Fujimori
Heterocycles 64 ( 1 ) 305 - 316 2004.12
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Efficient Preparation of 2-Azulenylboronate and Miyaura-Suzuki Cross-Coupling Reaction with Aryl Bromides for Easy Access to Poly(2-azulenyl)benzenes
S. Ito, T. Terazono, T. Kubo, T. Okujima, N. Morita, T. Murafuji, Y. Sugihara, K. Fujimori, J. Kawakami, and A. Tajiri
Tetrahedron 60 ( 25 ) 5357 - 5366 2004.6
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Electrochromic Application of Enediyne Scaffolding as a Redox-Active Chromophore. Synthesis and Redox Behavior of 9,10-Bis[3-(6-azulenyl)-1- (6-azulenylethynyl)-2-propynylidene]-9,10-dihydroanthracenes
S. Ito, H. Inabe, N. Morita, and A. Tajiri
Eur. J. Org. Chem. ( 8 ) 1774 - 1780 2004.4
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Preparation of azulenyllithium and magnesium reagents utilizing halogen–metal exchange reaction of several iodoazulenes with organolithium or magnesium ate complex
S. Ito, T. Kubo, N. Morita, Y. Matsui, T. Watanabe, A. Ohta, K. Fujimori, T. Murafuji, Y. Sugihara, and A. Tajiri
Tetrahedron Lett. 45 ( 14 ) 2891 - 2894 2004.3
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Competition between Intramolecular Electron-Transfer and Energy-Transfer Processes in Photoexcited Azulene-C60 Dyad
T. Makinoshima, M. Fujitsuka, O. Ito, S. Ito, and N. Morita
J. Phys. Chem. A. 108 ( 3 ) 368 - 375 2004.1
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Synthesis of Azulenylheterocyclic Compounds using 2-(2-Azulenyl)ethynyltriphenylphosphonium Bromide
S. Ito, S. Moriyama, M. Nakashima, M. Watanabe, T. Kubo, M. Yasunami, K. Fujimori, and N. Morita
Heterocycles 61 ( 1 ) 339 - 348 2003.12
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Synthesis, Stability, and Redox Behavior of Di(1-azulenyl)(6-azulenyl)methylium Hexafluorophosphates. Generation of a Donor-Acceptor Substituted Neutral Radical by Azulenes
S. Ito, T. Kubo, N. Morita, T. Ikoma, S. Tero-Kubota, and A. Tajiri
J. Org. Chem. 68 ( 25 ) 9753 - 9762 2003.12
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Synthesis of 2-Aminoazulene Derivatives. Nucleophilic and Palladium-Catalyzed Amination of 2-Substituted Azulene
R. Yokoyama, S. Ito, T. Okujima, T. Kubo, M. Yasunami, A. Tajiri, and N. Morita
Tetrahedron 59 ( 41 ) 8191 - 8198 2003.10
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Synthesis, Stability and Bonding Situation of Tris-, Bis- and Mono[9-(azuleno[1,2-b]thienyl)]methyl Cations
S. Ito, T. Kubo, M. Kondo, C. Kabuto, N. Morita, T. Asao, K. Fujimori, M. Watanabe, N. Harada, and M. Yasunami
Org. Biomol. Chem. 1 ( 14 ) 2572 - 2580 2003.7
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Preparation, Characterization, and Cycloaddition Reaction of the Heterocumulenes Attached Directly to Azulenes. An Efficient Strategy for the Preparation of Azulene-Substituted Heterocycles
S. Ito, T. Okujima, C. Kabuto, and N. Morita
Tetrahedron 59 ( 25 ) 4651 - 4659 2003.6
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Reaction of Azulenes with 1-Trifluoromethanesulfonylpyridinium Trifluoromethanesulfonate (TPT) and Synthesis of the Parent Azulene
S. Ito, R. Yokoyama, T. Okujima, T. Terazono, T. Kubo, A. Tajiri, M. Watanabe, and N. Morita
Org. Biomol. Chem. 1 ( 6 ) 1947 - 1952 2003.6
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Substrate Specificities of Medium-Prenylchain Elongating Enzymes, Hexaprenyl- and Heptaprenyl Diphosphate Synthases
M. Nagaki, K. Kuwahara, K. Kimura, J. Kawakami, Y. Maki, S. Ito, N. Morita, T. Nishino, and T. Koyama
J. Mol. Catal. B: Enzymatic 22 ( 1-2 ) 97 - 103 2003.4
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Synthesis of Poly(6-azulenylethynyl)benzene Derivatives as a Multi-Electron Redox System with Liquid Crystalline Behavior
S. Ito, H. Inabe, N. Morita, K. Ohta, T. Kitamura, and K. Imafuku
J. Am. Chem. Soc. 125 ( 6 ) 1669 - 1680 2003.2
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Synthesis, Absolute Configuration and Conformation of Optically Active 1,2-Homoheptafulvalene
S. Ito, M. Kurita, S. Kikuchi, T. Asao, Y. Ito, M. Oda, H. Sotokawa, A. Tajiri, and N. Morita
Org. Biomol. Chem. 1 ( 3 ) 488 - 492 2003.2