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Your search keyword '"Ryosuke Takechi"' showing total 8 results
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8 results on '"Ryosuke Takechi"'

1. Rhodium-Catalyzed Enantioselective Addition of Tricyclopropylboroxin to N-Sulfonylimines

Author

Tomotaka Nagai, Ryosuke Takechi, Yusuke Ebe, and Takahiro Nishimura

Subjects
Addition reaction, Diene, 010405 organic chemistry, Stereochemistry, Ligand, Organic Chemistry, Enantioselective synthesis, chemistry.chemical_element, 010402 general chemistry, 01 natural sciences, Medicinal chemistry, Catalysis, 0104 chemical sciences, Rhodium, chemistry.chemical_compound, chemistry
Abstract

A hydroxorhodium complex coordinated with a chiral diene ligand efficiently catalyzed the asymmetric addition of tricyclopropylboroxin to N -sulfonylimines in high yields and high enantioselectivities.

Published
2016

2. Enantioselective 1,4-addition of cyclopropylboronic acid catalyzed by rhodium/chiral diene complexes

Author

Ryosuke Takechi and Takahiro Nishimura

Subjects
Diene, Metals and Alloys, Enantioselective synthesis, chemistry.chemical_element, General Chemistry, Catalysis, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Rhodium, chemistry.chemical_compound, chemistry, Acid catalyzed, Materials Chemistry, Ceramics and Composites, Organic chemistry
Abstract

Rhodium-catalyzed asymmetric addition of cyclopropylboronic acids to electron-deficient alkenes such as alkenylsulfones, enones, enoates, and nitroalkenes proceeded to give high yields of the corresponding 1,4-addition products with high enantioselectivity.

Published
2015

3. ChemInform Abstract: Enantioselective 1,4-Addition of Cyclopropylboronic Acid Catalyzed by Rhodium/Chiral Diene Complexes

Author

Ryosuke Takechi and Takahiro Nishimura

Subjects
chemistry.chemical_compound, chemistry, Diene, Acid catalyzed, Enantioselective synthesis, chemistry.chemical_element, Organic chemistry, General Medicine, Rhodium
Abstract

Rhodium-catalyzed asymmetric addition of cyclopropylboronic acids to electron-deficient alkenes such as alkenylsulfones, enones, enoates, and nitroalkenes proceeded to give high yields of the corresponding 1,4-addition products with high enantioselectivity.

Published
2015

4. ChemInform Abstract: Rhodium-Catalyzed Asymmetric Addition of Arylboronic Acids to Cyclic N-Sulfonyl Ketimines Towards the Synthesis of α,α-Diaryl-α-Amino Acid Derivatives

Author

Takahiro Nishimura and Ryosuke Takechi

Subjects
chemistry.chemical_classification, Sulfonyl, Addition reaction, chemistry.chemical_compound, Amino acid derivative, chemistry, Diene, chemistry.chemical_element, General Medicine, Medicinal chemistry, Rhodium, Amino acid, Catalysis
Abstract

Rhodium/chiral diene complex-catalyzed asymmetric addition of arylboronic acids to cyclic ketimines having an ester group proceeded to give the corresponding α-amino acid derivatives in high yields with high enantioselectivity. The cyclic amino acid derivative was transformed into a linear α,α-diaryl-substituted α-N-methylamino acid ester.

Published
2015

5. Rhodium-catalyzed asymmetric addition of arylboronic acids to cyclic N-sulfonyl ketimines towards the synthesis of α,α-diaryl-α-amino acid derivatives

Author

Ryosuke Takechi and Takahiro Nishimura

Subjects
Sulfonyl, chemistry.chemical_classification, Diene, Molecular Structure, Organic Chemistry, chemistry.chemical_element, Biochemistry, Medicinal chemistry, Boronic Acids, Catalysis, Rhodium, Amino acid, chemistry.chemical_compound, Amino acid derivative, chemistry, Nitriles, Organometallic Compounds, Organic chemistry, Imines, Physical and Theoretical Chemistry, Amino Acids
Abstract

Rhodium/chiral diene complex-catalyzed asymmetric addition of arylboronic acids to cyclic ketimines having an ester group proceeded to give the corresponding α-amino acid derivatives in high yields with high enantioselectivity. The cyclic amino acid derivative was transformed into a linear α,α-diaryl-substituted α-N-methylamino acid ester.

Published
2015

6. ChemInform Abstract: Chiral Broensted Acid-Catalyzed Enantioselective Addition of Indoles to Ketimines

Author

Ryohei Kobayashi, Taichi Kano, Ryosuke Takechi, and Keiji Maruoka

Subjects
inorganic chemicals, chemistry.chemical_compound, Addition reaction, chemistry, organic chemicals, Acid catalyzed, Organocatalysis, Enantioselective synthesis, Organic chemistry, General Medicine, Phosphoric acid, Catalysis
Abstract

The title reaction is catalyzed by a chiral phosphoric acid and represents a rare example of an addition reaction to a non-aromatic ketimine (II).

Published
2014

7. Chiral Brønsted acid-catalyzed enantioselective addition of indoles to ketimines

Author

Taichi Kano, Ryohei Kobayashi, Ryosuke Takechi, and Keiji Maruoka

Subjects
Addition reaction, chemistry.chemical_compound, chemistry, Organic Chemistry, Enantioselective synthesis, Organic chemistry, Physical and Theoretical Chemistry, Brønsted–Lowry acid–base theory, Biochemistry, Phosphoric acid, Catalysis
Abstract

A highly enantioselective addition of indoles to a readily available ketimine was found to be catalyzed by a chiral phosphoric acid. This organocatalytic process represents a rare example of an addition reaction to a non-aromatic ketimine.

Published
2013

8. Rhodium-Catalyzed Enantioselective Addition of Tricyclopropylboroxin to N-Sulfonylimines.

Author

Takahiro Nishimura, Tomotaka Nagai, Ryosuke Takechi, and Yusuke Ebe

Subjects
RHODIUM, CATALYSIS, ADDITION reactions, IMINES, LIGANDS (Chemistry), DIOLEFINS
Abstract

A hydroxorhodium complex coordinated with a chiral diene ligand efficiently catalyzed the asymmetric addition of tricyclopropylboroxin to N-sulfonylimines in high yields and high enantioselectivities. [ABSTRACT FROM AUTHOR]

Published
2016
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