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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

The Synthesis of Heteroarylazulene

T. Shoji, S. Kikuchi, S. Ito, and N. Morita

Heterocycles   66 ( 1 )   91 - 94   2005.12

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Azulene-based Donor-Acceptor Systems: Synthesis, Optical and Electrochemical Properties

T. Shoji and S. Ito

Chem. Eur. J.   23 ( 66 )   16696 - 16709   2017.12

新規導入機器の紹介　元素分析装置

伊東俊司

弘前大学　機器分析センター年報   ( 5 )   3 - 6   2011.12

Recent Advances in the Development of Methods for the Preparation of Functionalized Azulenes for Electrochromic Applications

S. Ito, T. Shoji, and N. Morita

Synlett   ( 16 )   2279 - 2298   2011.10

Creation of Stabilized Electrochromic Materials by Taking Advantage of Azulene Skeletons

S. Ito and N. Morita

Eur. J. Org. Chem.   ( 27 )   4567 - 4579   2009.9

The Chemistry of 2H-Cyclohepta[b]furan-2-one: Synthesis, Transformation and Spectral Properties

N. Morita, K. Toyota, and S. Ito

Heterocycles   78 ( 8 )   1917 - 1954   2009.8

アズレン化学の展望と応用

齋藤勝裕、川俣　純、伊東俊司

未来材料   8 ( 10 )   32 - 38   2008.9

新規導入機器の紹介　フーリエ変換高分解能核磁気共鳴装置

伊東俊司

弘前大学　機器分析センター年報   ( 1 )   4 - 7   2008.2

アズレン環の特性を活かした有機機能性物質の創出

伊東俊司、森田　昇、久保貴弘

有機合成化学協会誌   62 ( 8 )   766 - 777   2004.8