研究者詳細 - 仁科　勇太

論文 - 仁科　勇太

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炭化水素の酸化触媒および炭化水素酸化物の製造方法査読

仁科勇太

特願2012-029061，岡山大学 2012年

臭素化触媒及びその製造方法査読

仁科勇太

特願2011-263954，岡山大学 2011年12月

Synthesis of Multisubstituted Cyclopentadienes from Cyclopentenones Prepared via Catalytic Double Aldol Condensation and Nazarov Reaction Sequence 査読

Yuta Nishina, Tomohiro Tatsuzaki, Ayano Tsubakihara, Yoichiro Kuninobu, Kazuhiko Takai

SYNLETT 17 ( 17 ) 2585 - 2589 2011年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：GEORG THIEME VERLAG KG

The rhenium-catalyzed synthesis of cyclopentenone derivatives via double aldol condensation and successive Nazarov reaction is described. The cyclopentenones were converted to the corresponding cyclopentadienes using organolithium reagents. Cyclopentadienes with four different substituents could be synthesized by stepwise double aldol condensation using a ketone and two types of aldehydes, followed by treatment with an organolithium reagent.

DOI： 10.1055/s-0030-1260324

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ハロゲン化触媒及びハロゲン化合物の製造方法査読

仁科勇太

PCT/JP2011/74795，岡山大学 2011年10月

Facile Sc(OTf)(3)-Catalyzed Generation and Successive Aromatization of Isobenzofuran from o-Dicarbonylbenzenes 査読

Yuta Nishina, Tatsuya Kida, Tomonari Ureshino

ORGANIC LETTERS 13 ( 15 ) 3960 - 3963 2011年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC

Isobenzofuran can be prepared from o-phthalaldehyde using hydrosilane. The formed isobenzofuran Is trapped by an alkene via a Diels-Alder reaction. Further dehydration proceeds to furnish the conjugated aromatic compound. This multistep reaction was promoted by catalytic amounts of Sc(OTf)(3).

DOI： 10.1021/ol201479p

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ハロゲン化触媒およびハロゲン化合物の製造方法査読

仁科勇太

特願2011-008026号，岡山大学 2011年1月

ハロゲン化触媒及びハロゲン化合物の製造方法査読

仁科勇太

特願2010-288035号岡山大学 2010年12月

Synthesis of Functionalized Pentacenes from Isobenzofurans Derived from C−H Bond Activation 査読

Kuninobu Yoichiro, Seiki Takayuki, Kanamaru Shunsuke, Nishina Yuta, Takai Kazuhiko

ORGANIC LETTERS 12 ( 22 ) 5287 - 5289 2010年11月

Rhenium-Catalyzed Insertion of Nonpolar and Polar Unsaturated Molecules into an Olefinic C-H Bond 査読

Yoichiro Kuninobu, Yasuo Fujii, Takashi Matsuki, Yuta Nishina, Kazuhiko Takai

ORGANIC LETTERS 11 ( 12 ) 2711 - 2714 2009年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC

Treatment of olefins bearing a directing group with alpha,beta-unsaturated carbonyl compounds, alkynes, or aldehydes in the presence of a catalytic amount of a rhenium complex, [ReBr(CO)(3)(thf)](2) gave gamma,delta-unsaturated carbonyl compounds, dienes, and allyl silyl ethers, respectively. This reaction proceeds via C-H bond activation, insertion of unsaturated molecules into the formed rhenium-carbon bond, and then reductive elimination (or transmetalation in the case of aldehydes).

DOI： 10.1021/ol900962v

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Reactions and Mechanistic Studies of Rhenium-Catalyzed Insertion of α,β-Unsaturated Carbonyl Compounds into a C-H Bond 査読

Kuninobu Yoichiro, Nishina Yuta, Okaguchi Kayo, Shouho Makoto, Takai Kazuhiko

BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 81 ( 11 ) 1393 - 1401 2008年11月

Synthesis of Cp-Re Complexes via Olefinic C-H Activation and Successive Formation of Cyclopentadienes 査読

Yoichiro Kuninobu, Yuta Nishina, Takashi Matsuki, Kazuhiko Takai

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 130 ( 43 ) 14062 - + 2008年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC

Treatment of an a,p-unsaturated ketimine with an alpha,beta-unsaturated carbonyl compound in the presence of a rhenium complex, Re-2(CO)(10), gave a cyclopentadienyl-rhenium complex. This reaction proceeds via rhenium-catalyzed C-H bond activation of an olefinic C-H bond, insertion of an alpha,beta-unsaturated carbonyl compound into a Re-C bond of the alkenylrhenium intermediate, intramolecular nucleophilic cyclization, reductive elimination, elimination of aniline to give a cyclopentadiene derivative, followed by the formation of a cyclopentadienyl-rhenium complex from the cyclopentadiene derivative and the rhenium complex.

DOI： 10.1021/ja805921f

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Hydroarylation of acetylenes, acrylates, and isocyanates with heteroaromatic compounds under rhenium catalysis 査読

Yoichiro Kuninobu, Kou Kikuchi, Yukimi Tokunaga, Yuta Nishina, Kazuhiko Takai

TETRAHEDRON 64 ( 26 ) 5974 - 5981 2008年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：PERGAMON-ELSEVIER SCIENCE LTD

With the aid of a directing group, an imine moiety, heteroaromatic compounds add to acetylenes in the presence of a catalytic amount of [ReBr(CO)(3)(THF)](2) at the adjacent position of the directing group regioselectively to give hydroarylation of the acetylenes in good to excellent yields. Similarly, heteroaromatic compounds react with acrylates and isocyanates to give the corresponding hydroarylation products under rhenium catalysis. (C) 2008 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.tet.2008.01.145

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Rhenium-catalyzed synthesis of indene derivatives via C-H bond activation 査読

Yoichiro Kuninobu, Yuta Nishina, Atsushi Kawata, Makoto Shouho, Kazuhiko Takai

PURE AND APPLIED CHEMISTRY 80 ( 5 ) 1149 - 1154 2008年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：INT UNION PURE APPLIED CHEMISTRY

Rhenium complex, [ReBr(CO)(3)(thf)](2)-catalyzed reactions between aromatic imines and either acetylenes or alpha,beta-unsaturated carbonyl compounds gave indene derivatives in good to excellent yields. These reactions proceed via C-H bond activation, insertion of acetylenes or alpha,beta-unsaturated carbonyl compounds, intramolecular nucleophilic cyclization, and reductive elimination. Indene derivatives were also obtained from aromatic ketones and alpha,beta-unsaturated carbonyl compounds in the presence of catalytic amounts of the rhenium complex and p-anisidine. Sequential ruthenium-catalyzed hydroamination of aromatic acetylenes with anilines, and rhenium-catalyzed reactions of the formed aromatic ketimines with alpha,beta-unsaturated carbonyl compounds also provided indene derivatives.

DOI： 10.1351/pac200880051149

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Rhenium-catalyzed synthesis of naphthalene derivatives via insertion of aldehydes into a C-H bond 査読

Yoichiro Kuninobu, Yuta Nishina, Kazuhiko Takai

TETRAHEDRON 63 ( 35 ) 8463 - 8468 2007年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：PERGAMON-ELSEVIER SCIENCE LTD

Arhenium complex, [ReBr(CO)(3)(THF)](2), catalyzed reactions of aromatic ketimines and aldehydes with dienophiles, followed by dehydration, to give naphthalene derivatives in good to excellent yields. This reaction proceeds via C-H bond activation, insertion of an aldehyde, intramolecular nucleophilic cyclization, reductive elimination, elimination of aniline and Diels-Alder reaction. After dehydration, naphthalene derivatives were formed. (c) 2007 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.tet.2007.05.083

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Manganese-catalyzed insertion of aldehydes into a C-H bond 査読

Yoichiro Kuninobu, Yuta Nishina, Takahiro Takeuchi, Kazuhiko Takai

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 46 ( 34 ) 6518 - 6520 2007年

わこうどの声

仁科勇太

炭素 2017 ( 279 ) 156 - 156 2007年

Rhenium-catalyzed insertion of aldehyde into a C-H bond: Synthesis of isobenzofuran derivatives 査読

Yoichiro Kuninobu, Yuta Nishina, Chie Nakagawa, Kazuhiko Takai

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 128 ( 38 ) 12376 - 12377 2006年9月

Sequential ruthenium-catalyzed hydroamination and rhenium-catalyzed C-H bond activation leading to indene derivatives 査読

Yoichiro Kuninobu, Yuta Nishina, Kazuhiko Takai

ORGANIC LETTERS 8 ( 13 ) 2891 - 2893 2006年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC

Formal [3+2] annulation of arylacetylenes and alpha,beta-unsaturated carbonyl compounds is achieved in a one-pot reaction by successive treatment of the acetylenes with aniline and a catalytic amount of Ru-3(CO)(12) and NH4PF6 and C-H bond activation catalyzed by [ReBr(CO)(3)(thf)](2). The result suggests that the second rhenium-catalyzed indene formation is not disturbed by the first catalyst system.

DOI： 10.1021/ol0611292

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Rhenium- and aniline-catalyzed one-pot annulation of aromatic ketones and alpha,beta-unsaturated esters initiated by C-H bond activation 査読

Y Kuninobu, Y Nishina, M Shoitho, K Takai

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 45 ( 17 ) 2766 - 2768 2006年

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