Search Results - "Shimbayashi, Takuya"

Recent Progress on Cyclic Nitrenoid Precursors in Transition‐Metal‐Catalyzed Nitrene‐Transfer Reactions by Shimbayashi, Takuya, Sasakura, Kohei, Eguchi, Akira, Okamoto, Kazuhiro, Ohe, Kouichi

“…Nitrene‐transfer reactions are powerful synthetic tools for the direct incorporation of nitrogen atoms into organic molecules. The discovery of novel…”
Get full text

Synthesis of 2H-Azirines by Iridium-Catalyzed Decarboxylative Ring Contraction of Isoxazol-5(4H)-ones by Okamoto, Kazuhiro, Shimbayashi, Takuya, Yoshida, Masato, Nanya, Atsushi, Ohe, Kouichi

“…A phosphine‐free iridium‐catalyzed reaction of isoxazol‐5(4H)‐ones (isoxazolones) has been developed, and affords 2H‐azirines through decarboxylation and ring…”
Get full text

Iron‐Catalyzed Aminative Cyclization/Intermolecular Homolytic Aromatic Substitution Using Oxime Esters and Simple Arenes by Shimbayashi, Takuya, Okamoto, Kazuhiro, Ohe, Kouichi

“…Intermolecular C−H alkylation of simple arenes in the presence of an iron catalyst has been achieved in a cascade manner with an aminative cyclization…”
Get full text

Generation of Stable Ruthenium(IV) Ketimido Complexes by Oxidative Addition of Oxime Esters to Ruthenium(II): Reactivity Studies Based on Electronic Properties of the Ru−N Bond by Shimbayashi, Takuya, Okamoto, Kazuhiro, Ohe, Kouichi

“…The reaction of an oxime ester with [Ru(PPh3)3X2] proceeded smoothly at room temperature to afford a stable RuIV ketimido complex as oxidative adduct. The…”
Get full text

Indium-Catalyzed [2 + 2] Cycloaddition of Allylsilanes to Internal Alkynones by Okamoto, Kazuhiro, Shimbayashi, Takuya, Tamura, Eisuke, Ohe, Kouichi

“…We have developed an indium-catalyzed [2 + 2] cycloaddition of allylsilanes to alkynones leading to selective cyclobutenone formation. The resulting…”
Get full text

A 7‑Step Formal Asymmetric Total Synthesis of Strictamine via an Asymmetric Propargylation and Metal-Mediated Cyclization by Smith, Myles W, Zhou, Zhiyao, Gao, Alison X, Shimbayashi, Takuya, Snyder, Scott A

“…Herein is shown how a novel catalytic asymmetric propargylation of 3,4-dihydro-β-carboline, followed by a designed Au­(I)/Ag­(I)-mediated 6-endo-dig…”
Get full text

Recent Advances in Homogeneous Catalysis via Metal–Ligand Cooperation Involving Aromatization and Dearomatization by Takuya Shimbayashi, Ken-ichi Fujita

“…Recently, an increasing number of metal complex catalysts have been developed to achieve the activation or transformation of substrates based on cooperation…”
Get full text

Ruthenium-catalyzed Decarboxylative and Dehydrogenative Formation of Highly Substituted Pyridines from Alkene-tethered Isoxazol-5(4H)-ones by Okamoto, Kazuhiro, Sasakura, Kohei, Shimbayashi, Takuya, Ohe, Kouichi

“…A ruthenium-catalyzed reaction of alkene-tethered isoxazol-5(4H)-ones affording pyridines has been developed. Di-, tri-, and tetrasubstituted pyridines were…”
Get full text

Effect of Substituents in Functional Bipyridonate Ligands on Ruthenium‐Catalyzed Dehydrogenative Oxidation of Alcohols: An Experimental and Computational Study by Shimbayashi, Takuya, Ito, Hajime, Shimizu, Mineyuki, Sano, Hayato, Sakaki, Shigeyoshi, Fujita, Ken‐ichi

“…A series of hexamethylbenzene (HMB)–Ru complexes 2–5 bearing a 4,4’‐functionalized 2,2’‐bipyridine‐6,6’‐dionate (bpyO) ligand, which exhibits metal‐ligand…”
Get full text

Environmentally Friendly Synthesis of N-Methylated Nitrogen Heterocycles from an Aqueous Solution of Methylamine and Diols by Fujita, Ken-ichi, Enomoto, Akane, Shimbayashi, Takuya

Get full text

Effect of a Substituent in Cyclopentadienyl Ligand on Iridium-Catalyzed Acceptorless Dehydrogenation of Alcohols and 2-Methyl-1,2,3,4-tetrahydroquinoline by Jaeyoung Jeong, Takuya Shimbayashi, Ken-ichi Fujita

“…New iridium(III)-bipyridonate complexes having cyclopentadienyl ligands with a series of alkyl substituents were synthesized for the purpose of tuning the…”
Get full text

Iridium-Catalyzed Transfer Hydrogenation of Ketones and Aldehydes Using Glucose as a Sustainable Hydrogen Donor by Masato Yoshida, Ryota Hirahata, Takayoshi Inoue, Takuya Shimbayashi, Ken-ichi Fujita

“…A new catalytic system for transfer hydrogenation of carbonyl compounds using glucose as a hydrogen donor was developed. Various ketones and aldehydes were…”
Get full text

Palladium-Catalyzed Selective Formation of Substituted Pyrroles from Alkene-tethered Cyclic Oxime Esters by Ohe, Kouichi, Okamoto, Kazuhiro, Oda, Tomohiro, Shimbayashi, Takuya, Matsushita, Gaku, Sasakura, Kohei

Get full text

Successive Activation of C–H and C–O Bonds of Vinyl Ethers by a Diphosphine and Hydrido-Bridged Diiridium Complex by Takahashi, Yoshinori, Shimbayashi, Takuya, Fujita, Ken-ichi

“…The reaction of [(Cp*Ir)2(μ-dmpm)(μ-H)][OTf] (2) [Cp* = η5-C5Me5, dmpm = bis(dimethylphosphino)methane] with 2,3-dihydrofuran gives…”
Get full text

Dehydrogenative Transformation of Alcoholic Substrates in Aqueous Media Catalyzed by an Iridium Complex Having a Functional Ligand with α-Hydroxypyridine and 4,5-Dihydro-1H-imidazol-2-yl Moieties by Masato Yoshida, Han Wang, Takuya Shimbayashi, Ken-ichi Fujita

“…A new catalytic system that employs water as an environmentally friendly solvent for the dehydrogenative oxidation of alcohols and lactonization of diols has…”
Get full text

Synthesis of 2H-Azirines by Iridium-Catalyzed Decarboxylative Ring Contraction of Isoxazol-5(4H)-ones by Okamoto, Kazuhiro, Shimbayashi, Takuya, Yoshida, Masato, Nanya, Atsushi, Ohe, Kouichi

“…A phosphine‐free iridium‐catalyzed reaction of isoxazol‐5(4H)‐ones (isoxazolones) has been developed, and affords 2H‐azirines through decarboxylation and ring…”
Get full text

Metal-catalyzed hydrogenation and dehydrogenation reactions for efficient hydrogen storage by Shimbayashi, Takuya, Fujita, Ken-ichi

“…Hydrogen is widely considered an ideal energy source from the viewpoint of sustainability. However, as hydrogen is a gas under ambient conditions and needs to…”
Get full text

Facile Construction of Tetrahydropyrrolizines by Iron-Catalyzed Double Cyclization of Alkene-Tethered Oxime Esters with 1,2-Disubstituted Alkenes by Shimbayashi, Takuya, Nakamoto, Daiki, Okamoto, Kazuhiro, Ohe, Kouichi

“…The iron-catalyzed cycloaddition reaction of alkene-tethered oxime esters with 1,2-disubstituted alkenes afforded tetrahydro­pyrrolizines, the structural motif…”
Get full text

Palladium-Catalyzed Aza-Wittig-Type Condensation of Isoxazol-5(4H)-ones with Aldehydes by Okamoto, Kazuhiro, Shimbayashi, Takuya, Tamura, Eisuke, Ohe, Kouichi

“…This paper describes the development of a palladium‐catalyzed decarboxylative inter‐ and intramolecular condensation reaction of isoxazol‐5(4 H)‐ones with…”
Get full text

Divergent Catalytic Approach from Cyclic Oxime Esters to Nitrogen-Containing Heterocycles with Group 9 Metal Catalysts by Shimbayashi, Takuya, Matsushita, Gaku, Nanya, Atsushi, Eguchi, Akira, Okamoto, Kazuhiro, Ohe, Kouichi

“…We report the divergent catalytic transformation of alkene-tethered isoxazol-5­(4H)-ones by using rhodium and cobalt catalysts to afford 2H-pyrroles (with Rh…”
Get full text