OHTA Akira
Academic Assembly School of Science and Technology Institute of Science
Faculty of Science Department of Science Course of Chemistry
Professor
Researcher Information
Research Keyword
- Structural Organic Chemistry, Functional Organic Chemistry
Research activity information
Paper
- Molecular Transformation to Pyrroles, Pentafulvenes, andPyrrolopyridines by [2+2] Cycloaddition of Propargylamines withTetracyanoethylene
T. Shoji, S. Takagaki, Y. Ariga, A.Yamazaki, M. Takeuchi, A. Ohta, R. Sekiguchi, S.i Mori, T. Okujima, S. Ito
Chem. Eur. J., 26, 1931-1935, 2020 - 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, S. Ito
Org. Biomol. Chem., 18, 2274-2282, 2020 - Synthesis of 6-Amino- and 6-Arylazoazulenes via Nucleophilic Aromatic Substitution and Their Reactivity and Propertie
T. Shoji, S. Sugiyama, M. Takeuchi, A. Ohta, R. Sekiguchi, S.i Ito, T. Yatsu, T. Okujima, M. Yasunami
J. Org. Chem., 84, 1257-1275, 2019 - Synthesis of azulenophthalimides by phosphine-mediated annulation of 1,2-diformylazulenes with maleimides
T. Shoji, T. Araki, N. Iida, K. Miura, A. Ohta, R. Sekiguchi, S. Ito, T. Okujima
Org. Chem. Front., 6, 195-204, 2019 - 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, T. Okujima
Org. Chem. Front., 6, 2801-2811, 2019 - 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. Itoi; S. Mori; T. Okujima.
Org. Biomol. Chem., 16, 480-489, 2018 - 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. Itoi; S. Mori; T. Okujima; Y. Yasunami.
Eur. J. Org. Chem., 2018, 1145-1157, 2018 - 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.
T. Shoji; K. Miura; T. Araki; A. Maruyama; A. Ohta; R. Sekiguchi; S. Itoi; T. Okujima.
J. Org. Chem., 83, 6690-6705, 2018 - Micropore Formation of [Zn2(Oxac) (Taz)2]·(H2O)2.5 via CO2 Adsorption
M. Zubir, A.Hamasaki, T. Iiyama, A. Ohta, H. Ohki, S. Ozeki
LANGMUIR, 33, 680-684, 2017 - 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, K. Toyota
J. Org. Chem., 82, 1657-1665, 2017 - Synthesis of 2-Aminofurans by Sequential [2+2] Cycloaddition-Nucleophilic Addition of 2-Propyn-1-ols with Tetracyanoethylene and Amine-Induced Transformation into 6-Aminopentafulvenes
T. Shoji, D. Nagai, M. Tanaka, T. Araki, A. Ohta, R. Sekiguchi, S. Ito, S. Mori, T. Okujima
Chem. Eur. J., 23, 5126-5136, 2017 - 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, M. Yasunami
Org. Biomol. Chem., 15, 3917-3923, 2017 - 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. Itoi; T. Okujima.
Heterocycles, 94, 1870-1883, 2017 - Magnetic Field Control of Micropore Formation in [Zn2(Oxac)(Taz)2]·(H2O)x
M. Zubir, A. Hamasaki, T. Iiyama, A. Ohta, H. Ohki, and S. Ozeki,
Chem. Lett., 45, 362-364, 2016 - Synthesis and Stability of 1,1-Diphenyl-1H-azulenium Cation
M. Oda, N. Nakajima, Y. Kumai, A. Ohta, R. Miyatake, and S. Kuroda
Am. J. Org. Chem., 6, 8-16, 2016 - Novel Synthetic Methods for Disubstituted Pyrroles from Pyrrolidine and 2-Substituted 1-Pyrrolines
M. Oda, S. Ito, Y. Fukuchi, S. Kato, Y. Fujiwara, Y. Kumai, K. Ariyasu, A. Ohta, S. Kuroda, and R. Miyatake
IJSRSET, 2, 424-435, 2016 - REDOX RESPONSIVE POLYMER INCORPORATED WITH MESOGENIC UNIT AND BIS(BENZODITHIOLYL)BITHIENYL SCAFFOLD
Toshihiro Ohtake, Hideki Tanaka, Tetsuro Matsumoto, Mutsumi Kimura, and Akira Ohta
Heterocycles, 90(2), 811-818, 2015, Refereed - Synthesis and Properties of 2,6-Bis(1-Azaazulen-2-yl)-Pyridine
M. Oda, Y. Yamaga, Y. Kumai, A. Ohta, and R. Miyatake
Mod. Chem., 2, 14-17, 2015 - Synthesis and Spectrocsopic Properties of 1H-Cyclohepta[2,1-b:3,4-b’]diindole and Molecular Structure of its Protonated Species
Y. Kumai, R. Miyatake, Y. Sugeno, A. Ohta, and Mitsunori Oda
Am. J. Org. Chem., 5, 10-13, 2015 - A Short-Step Synthesis of syn-1,6:8,13-Dimethano[14]annulene Dicarboximides
M. Oda, M. Neha, Y. Kumai, A. Ohta, R. Miyatake, Y. Zhang, and S. Kuroda
Am. J. Org. Chem., 5, 105-111, 2015 - Unusually Efficient Deformylative Synthesis of 1,2,8,9-Tetrasubstituted Dipyrrins from 4,5-Disubstituted Pyrrole-2-carbaldehydes
Mitsunori Oda, Yurie Fujiwara, Yoshimitsu Kumai, Akira Ohta, and Ryuta Miyatake
Heterocycles, 90, 238-251, 2015, Refereed - An improved synthesis of arenedicarboximides by phosphine-assisted annulation of arene-1,2-dicarbaldehyde with N-Substituted maleimide
M. Oda, H. Shimosasa, Y. Kumai, A. Ohta, and R. Miyatake
Mod. Chem., 2, 29-35, 2014 - Deformation of Redox-Active Polymer Gel Based on Polysiloxane Backbone and Bis(benzodithiolyl)bithienyl Scaffold
Toshihiro Ohtake, Hideki Tanaka, Tetsuro Matsumoto, Akira Ohta, and Mutsumi Kimura
LANGMUIR, 30, 14680-14685, 2014, Refereed - A short-step synthesis of 1,6-methano[10]annulene-3,4-dicarboximides and their benzene-, naphthalene-, and thiophene-annulated compounds
Mitsunori Oda, Tomomi Nakamura, Miyako Neha, Daisuke Miyawaki, Akira Ohta, Shigeyasu Kuroda and Ryuta Miyatake
Eur. J. Org. Chem, 2014, 5976-5985, 2014 - Redox-Driven Molecular Switches Consisting of Bis(benzodithiolyl)bithienyl Scaffold and Mesogenic Moieties: Synthesis and Complexes with Liquid Crystalline Polymer
Toshihiro Ohtake, Hideki Tanaka, Tetsuro Matsumoto, Mutsumi Kimura, and Akira Ohta
J. Org. Chem., 74, 6590-6602, 2014 - Effects of Alkoxy Substitution on the Optical Properties of 9,10-Anthraquinone and Anthracene: 2,3,6,7-Tetrapropoxy-substituted vs. 2,6-Dipropoxy-substituted Derivatives
A. Ohta, K. Hattori, Y. Kusumoto, T. Kawase, T. Kobayashi, H. Naito, and C. Kitamura
Chem. Lett., 41, 674-676, 2012, Refereed - 2,3,6,7-Tetramethoxy-9,10-anthraquinone
A. Ohta, K. Hattori, T. Kawase, T. Kobayashi, H. Naito, and C. Kitamura
Acta Cryst., E68, o2587, 2012, Refereed - 2,6-Dimethoxy-9,10-anthraquinone
A. Ohta, K. Hattori, T. Kobayashi, H. Naito, T. Kawase, C. Kitamura
Acta Cryst., E68, o2843, 2012, Refereed - Out-of-plane deformation of the azulene ring along its short molecular axis in crystal and theoretical structures of 1,3-diheterolyl- and 1,3-diphenylazulenes
A. Ohta, S. Kuroda,N. C. Thanh, K. Terasawa, K. Fujimori, K. Nakajima, and M. Oda
Heterocycles, 79, 451-470, 2009 - Preparation of Azulene Substituted Pyrazine and Quinoxaline Derivatives
N. Furuta, T. Mizutani, A. Ohta, and K. Fujimori
Heterocycles, 77, 1079-1088, 2009 - Synthesis of 1,2-Azulenequinone Derivatives by Bromine-Oxidation
H. Wakabayashi, O. Irinamihira, S. Shibata, T. Kurihara, Y. Uchiyama, A. Ohta, and K. Fujimori
Heterocycles, 76, 1133-1140, 2008 - Preparation of new nitrogen-bridged heterocycles. 60. Syntheses and conformational analyses of bis(indolizin-1-yl) Disulfides
A. Kakehi, H. Suga, H. Okuno, M. Okuhara, and A. Ohta
Chem. Pharm. Bull., 55(10), 1458-1465, 2007 - Synthesis and properties of bis(1,3-Benzodithiole)-type redox systems containing a xylyl rotator unit: A new type of redox-responsive molecular rotor
Y. Uchiyama, A. Ohta, and K. Fujimori
Heterocycles, 74, 251-257, 2007
- Out-of-plane deformation of the azulene ring in crystal structures of simply substituted azulene derivatives.
A. Ohta, N. C. Thanh, K. Terasawa, K. Fujimori, S. Kuroda, and M. Oda
Tetrahedron Lett., 47(16), 2815-2819, 2006 - Novel 9,10-bis(1,3-dithiol-2-ylidene)-9,10-dihydroanthracene derivatives bridged by a crown ether unit at the 1,8-positions: a new type of redox-switchable hosts undergoing reversible structural changes.
A. Ohta, T. Numae, Y. Yamashita, and K. Fujimori
Heterocycles, 67(2), 665-678, 2006 - Synthesis and properties of novel bis(1,3-benzodithiolium)-type dications containing a biaryl unit: new redox systems undergoing reversible structural changes by electron transfer.
A. Ohta, C. Ueki, Y. Uchiyama, and K. Fujimori
Heterocycles, 69(1), 365-375, 2006 - Poly(benzyl ether) dendrimers with strongly fluorescent distyrylbenzene cores as the fluorophores for peroxyoxalate chemiluminescence: insulating effect of dendritic structures on fluorescent sites.
R. Koike, Y. Katayose, A. Ohta, J. Motoyoshiya,, Y. Nishii, and H. Aoyama
Tetrahedron, 61(46), 11020-11026, 2005
- 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 - Preparation and structure of Di(2-azulenyl)ketene adducts. gamma-lactone and beta-lactam derivatives.
S. Ito, H. Hamazaki, Y. Hirasawa, A. Ohta, K. Fujimori, N. Tanaka, and M. Shiro
Heterocycles, 62, 463-478, 2004 - Preparation of new nitrogen-bridged heterocycles. 56. Syntheses and reactions of 1-[2,2-bis(alkylthio)-1-(ethoxycarbonylacetyl)vinyl]pyridinium salts.
A. Kakehi, H. Suga, Y. Yamauchi, K.Yasuraoka, T. Kobayashi, and A. Ohta
Chem. Pharm. Bull., 52(11), 1316-1321, 2004 - Synthesis of azulenequinones fused with thiophene and furan.
H. Matsuo, K. Fujimori, A. Ohta, A. Kakehi, M. Yasunami, and T. Nozoe
Heterocycles, 61, 271-279, 2003 - Preparation, structure, and properties of 1,3-bis-(1,4-dithiafulven-6-yl)azulenes.
A. Ohta, K. Yamaguchi, N. Fujisawa, Y. Yamashita, and K. Fujimori
Heterocycles, 54, 377-385, 2001 - Neighboring group effect of pyridazine and pyrazine rings for p -facial selectivity in the reactions of fused isopropylidenenorbornene systems with electrophilic reagents.
T. Kobayashi,K. Miki, B. Nikaeen, andA. Ohta
J. Chem. Soc., Perkin Trans. 1, 1372-1385, 2001 - Novel bis(1,3-dithiole) electron donors by oxidative intramolecular cyclization of 2,2'-bis(1,4-dithiafulven-6-yl)-3,3'-bithienyls.
A. Ohta and Y. Yamashita
Mol. Cryst. Liq. Cryst., 296, 1-18, 1997 - Preparation, properties, and oxidation of novel bis(1,3-dithiole)compounds containing a di(2-thienyl)methane unit
A. Ohta and Y. Yamashita
Heterocycles, 44, 263-276, 1997 - Oxidative intramolecular cyclization of 2,2'-bis(1,4-dithiafulven-6-yl)-3,3'-bithienyls affording novel bis(1,3-dithiole) electron donors.
A. Ohta and Y. Yamashita
J. Chem. Soc., Chem., Commun., 1761-1762, 1995 - Preparation and properties of bis[5-(6-methyl-1,4-dithiafulven-6-yl)-2-thienyl]methanes affording near-infrared absorbing cations by oxidation.
A. Ohta and Y. Yamashita
J. Chem. Soc., Chem., Commun., 557-558, 1995 - Preparation andproperties of tris(1,3-dithiole) donors containing thiophene spacer units.
A. Ohta and Y. Yamashita
Heterocycles, 40, 123-126, 1995 - Hetero-analogs of Hueckel degenerate systems and related compounds: preparation of thienyl-substituted fulvalene and electron-donating tetrathiafulvalene vinylogues and conductive complexes.
A. Ohta, T. Kobayashi, and H. Kato,
J. Chem. Soc., Perkin Trans. 1, (8), 905-911, 1993 - Preparation of thienyl-substituted fulvalene and tetrathiafulvalene vinylogens as electron donors and conductive complexes derived from one of them.
A. Ohta, T. Kobayashi, and H. Kato,
J. Chem. Soc., Chem., Commun., (5), 431-432, 1993
