Search Results - "Takumi Azuma"

Chiral Integrated Catalysts Composed of Bifunctional Thiourea and Arylboronic Acid: Asymmetric Aza-Michael Addition of α,β-Unsaturated Carboxylic Acids by Hayama, Noboru, Azuma, Takumi, Kobayashi, Yusuke, Takemoto, Yoshiji

“…The first intermolecular asymmetric Michael addition of nitrogen-nucleophiles to α,β-unsaturated carboxylic acids was achieved through a new type of…”
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Synthesis of trifunctional thioureas bearing 1,5-disubstituted triazole tether by Ru-catalyzed Huisgen cycloaddition by Takasu, Kiyosei, Azuma, Takumi, Takemoto, Yoshiji

“…Synthesis of trifunctional thiourea catalysts tethered with a variety of functional group is described. 1,5-Triazole tether in the catalysts was constructed by…”
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Auto-tandem catalysis: facile synthesis of substituted alkylidenecyclohexanones by domino (4+2) cycloaddition-elimination reaction by Takasu, Kiyosei, Tanaka, Toru, Azuma, Takumi, Takemoto, Yoshiji

“…A catalytic domino reaction producing substituted 2-alkylidenecyclohexanone from 3-oxymethyl-2-siloxy-1,3-butadienes, which can be prepared from Baylis-Hillman…”
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Formal (3+3) Cycloaddition of Silyl Enol Ethers Catalyzed by Trifric Imide: Domino Michael Addition–Claisen Condensation Accompanied with Isomerization of Silyl Enol Ethers by Azuma, Takumi, Takemoto, Yoshiji, Takasu, Kiyosei

“…We describe here a Tf2NH-catalyzed formal (3+3) cycloaddition of silyl enol ethers with acrylates as a new domino reaction. In the domino sequence, the…”
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Synthesis and properties of chiral thioureas bearing an additional function at a remote position tethered by a 1,5-disubstituted triazole by Takasu, Kiyosei, Azuma, Takumi, Enkhtaivan, Iderbat, Takemoto, Yoshiji

“…The synthesis and properties of multifunctional thioureas bearing a variety of functional groups at a position remote from the thiourea moiety are described. A…”
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Chiral Integrated Catalysts Composed of Bifunctional Thiourea and Arylboronic Acid : Asymmetric Aza-Michael Addition of α,β-Unsaturated Carboxylic Acids by Noboru Hayama, Takumi Azuma, Yusuke Kobayashi, Yoshiji Takemoto

“…The first intermolecular asymmetric Michael addition of nitrogen-nucleophiles to α,β-unsaturated carboxylic acids was achieved through a new type of…”
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A Dual Arylboronic Acid–Aminothiourea Catalytic System for the Asymmetric Intramolecular Hetero-Michael Reaction of α,β‑Unsaturated Carboxylic Acids by Azuma, Takumi, Murata, Akihiro, Kobayashi, Yusuke, Inokuma, Tsubasa, Takemoto, Yoshiji

“…A bifunctional aminoboronic acid has been used to facilitate for the first time the intramolecular aza- and oxa-Michael reactions of α,β-unsaturated carboxylic…”
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Formal (3+3) Cycloaddition of Silyl Enol Ethers Catalyzed by Trifric Imide: Domino Michael Addition-Claisen Condensation Accompanied with Isomerization of Silyl Enol Ethers by Takumi AZUMA, Yoshiji TAKEMOTO, Kiyosei TAKASU

“…We describe here a Tf2NH-catalyzed formal (3+3) cycloaddition of silyl enol ethers with acrylates as a new domino reaction. In the domino sequence, the…”
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Synthesis and Characterization of Binary-Complex Models of Ureas and 1,3-Dicarbonyl Compounds: Deeper Insights into Reaction Mechanisms Using Snap-Shot Structural Analysis by Azuma, Takumi, Kobayashi, Yusuke, Sakata, Ken, Sasamori, Takahiro, Tokitoh, Norihiro, Takemoto, Yoshiji

“…The mechanism of the enantioselective Mannich reaction catalyzed by a hydrogen-bond (HB)-donor bifunctional organocatalyst has been fully investigated using…”
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Chiral Integrated Catalysts Composed of Bifunctional Thiourea and Arylboronic Acid by Hayama, Noboru, Azuma, Takumi, Kobayashi, Yusuke, Takemoto, Yoshiji

“…The first intermolecular asymmetric Michael addition of nitrogen-nucleophiles to α,β-unsaturated carboxylic acids was achieved through a new type of…”
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Formal (3+3) Cycloaddition of Silyl Enol Ethers Catalyzed by Trifric Imide by Azuma, Takumi, Takemoto, Yoshiji, Takasu, Kiyosei

“…We describe here a Tf2NH-catalyzed formal (3+3) cycloaddition of silyl enol ethers with acrylates as a new domino reaction. In the domino sequence, the…”
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Basic Study on the Charging Characteristics and the Vibration Control Using the Linear Synchronous Generator by Azuma, Takumi, Maruyama, Taichi, Ohashi, Shunsuke

“…The linear synchronous generator for harnessing vibration energy was investigated in this study. The linear synchronous generator comprises the permanent…”
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