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Takuya Hirakawa

Tottori University

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Publication

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Organic Letters | 2011

Ruthenium-Catalyzed Regioselective [2 + 2 + 2] Cyclotrimerization of Trifluoromethyl Group Substituted Internal Alkynes

Motoi Kawatsura; Mitsuaki Yamamoto; Junya Namioka; Koji Kajita; Takuya Hirakawa; Toshiyuki Itoh

It found that the Ru(3)(CO)(12) coordinated with 2-(diphenylphosphino)benzonitrile (2-DPPBN) to effectively catalyze the [2 + 2 + 2] cyclotrimerization of the trifluoromethyl group substituted internal alkynes in high yields with up to >98% regioselectivity. Isolation of a ruthenacyclopentadiene was successful and confirmed that the complex is a reaction intermediate.

Organic Letters | 2014

Enantioselective Allylic Amination of Trifluoromethyl Group Substituted Racemic and Unsymmetrical 1,3-Disubstituted Allylic Esters by Palladium Catalysts

Motoi Kawatsura; Shou Terasaki; Maki Minakawa; Takuya Hirakawa; Kazunori Ikeda; Toshiyuki Itoh

The palladium-catalyzed regio- and enantioselective allylic amination of trifluoromethyl group substituted racemic and unsymmetrical 1,3-disubstituted allylic esters has been accomplished. The enantioselective formation of the α-type allylic amines was attained by the dynamic kinetic asymmetric transformation (DYKAT).

Advanced Synthesis & Catalysis | 2008

Remarkable Activation of an Enzyme by (R)‐Pyrrolidine‐ Substituted Imidazolium Alkyl PEG Sulfate

Yoshikazu Abe; Takuya Hirakawa; Shino Nakajima; Nagisa Okano; Shuichi Hayase; Motoi Kawatsura; Yoshihiko Hirose; Toshiyuki Itoh

Tetrahedron Letters | 2008

Regioselective synthesis of trifluoromethyl group substituted allylic amines via palladium-catalyzed allylic amination

Motoi Kawatsura; Takuya Hirakawa; Tomoko Tanaka; Daiji Ikeda; Shuichi Hayase; Toshiyuki Itoh

Tetrahedron Letters | 2008

Ruthenium-catalyzed linear selective allylic aminations of monosubstituted allyl acetates

Motoi Kawatsura; Fumio Ata; Takuya Hirakawa; Shuichi Hayase; Toshiyuki Itoh

Tetrahedron | 2011

Regioselective synthesis of trifluoromethyl group containing allylic amines by palladium-catalyzed allylic amination and sequential isomerization

Takuya Hirakawa; Kazunori Ikeda; Daiji Ikeda; Tomoko Tanaka; Hiroshi Ogasa; Motoi Kawatsura; Toshiyuki Itoh

Tetrahedron-asymmetry | 2007

Synthesis of enantiomerically pure cycloalkenols via combination strategy of enzyme-catalyzed reaction and RCM reaction

Han Shi-Hui; Takuya Hirakawa; Takaaki Fukuba; Shuichi Hayase; Motoi Kawatsura; Toshiyuki Itoh

Journal of Fluorine Chemistry | 2013

A chronicle review: Regioselective synthesis of trifluoromethyl group containing allylic amines using palladium-catalyzed allylic amination pathway

Takuya Hirakawa; Motoi Kawatsura; Toshiyuki Itoh

Synlett | 2010

Regioselective Synthesis ofOptically Active Trifluoromethyl Group Substituted AllylicAmines by Palladium-Catalyzed Allylic Amination

Takuya Hirakawa; Kazunori Ikeda; Hiroshi Ogasa; Motoi Kawatsura; Toshiyuki Itoh

Chemistry Letters | 2011

Palladium-catalyzed Regio- and Diastereoselective Allylic Alkylation in Ionic Liquids

Motoi Kawatsura; Hideyuki Nobuto; Shunsuke Hayashi; Takuya Hirakawa; Daiji Ikeda; Toshiyuki Itoh

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Collaboration

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Motoi Kawatsura

Tottori University

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Toshiyuki Itoh

Tottori University

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Shuichi Hayase

Tottori University

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Daiji Ikeda

Tottori University

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Kazunori Ikeda

Nihon University

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Hiroshi Ogasa

Tottori University

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Nagisa Okano

Tottori University

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Shino Nakajima

Tottori University

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Tomoko Tanaka

Tottori University

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Yoshikazu Abe

Tottori University

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