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5 results on '"Kotomi Yamada"'

1. Alkynoxy-Directed C–H Functionalizations: Palladium(0)-Catalyzed Annulations of Alkynyl Aryl Ethers with Alkynes

Author

Yuki Shiraishi, Mayuko Kanda, Kotomi Yamada, Yasunori Minami, Tomohiro Anami, Tatsuro Kodama, and Tamejiro Hiyama

Subjects
chemistry.chemical_compound, Annulation, Chemistry, Aryl, Organic chemistry, chemistry.chemical_element, Sequence (biology), General Chemistry, Medicinal chemistry, Palladium, Catalysis
Abstract

Palladium(0)-catalyzed insertion/annulation sequence between aryl silylethynyl ethers and internal alkynes was found to proceed through activation of ortho-C–H bonds assisted by alkynoxy groups and...

Published
2015

2. Intramolecular Hydroalkylation via Activation oftert-Butyl C–H Bond in Silylethynyl Aryl Ethers

Author

Kotomi Yamada, Yasunori Minami, Yuta Noguchi, and Tamejiro Hiyama

Subjects
inorganic chemicals, chemistry.chemical_classification, Tert butyl, Ketone, Pivalic acid, C h bond, 010405 organic chemistry, Aryl, General Chemistry, 010402 general chemistry, 01 natural sciences, Medicinal chemistry, Aldehyde, 0104 chemical sciences, Acetic acid, chemistry.chemical_compound, chemistry, Intramolecular force, Organic chemistry
Abstract

The title reaction of silylethynyl 2,6-(tBu)2phenyl ethers took place in the presence of a palladium catalyst and pivalic acid to give 2-silylmethylenechromanes. The initial products were converted by treatment with acetic acid to thermodynamically stable 4H-chromenes, which were further reacted with activated aldehyde and ketone.

Published
2016

3. ChemInform Abstract: Alkynoxy-Directed C-H Functionalizations: Palladium(0)-Catalyzed Annulations of Alkynyl Aryl Ethers with Alkynes

Author

Yuki Shiraishi, Tomohiro Anami, Yasunori Minami, Mayuko Kanda, Tatsuro Kodama, Tamejiro Hiyama, and Kotomi Yamada

Subjects
Annulation, chemistry.chemical_compound, Stereochemistry, Chemistry, Aryl, chemistry.chemical_element, General Medicine, Catalysis, Palladium, Sequence (medicine)
Abstract

Palladium(0)-catalyzed insertion/annulation sequence between aryl silylethynyl ethers and internal alkynes was found to proceed through activation of ortho-C–H bonds assisted by alkynoxy groups and...

Published
2016

4. Palladium-Catalyzed Cycloaddition of Alkynyl Aryl Ethers with Internal Alkynes via Selective Ortho C–H Activation

Author

Tamejiro Hiyama, Kotomi Yamada, Yasunori Minami, and Yuki Shiraishi

Subjects
Hydride, Aryl, chemistry.chemical_element, General Chemistry, Biochemistry, Oxidative addition, Medicinal chemistry, Catalysis, Cycloaddition, chemistry.chemical_compound, Colloid and Surface Chemistry, chemistry, Surface modification, Organic chemistry, Palladium
Abstract

Alkynyl aryl ethers react with internal alkynes through selective ortho C-H activation by a palladium(0) catalyst to give substituted 2-methylidene-2H-chromenes. The alkynoxy group acts as a directing group to promote ortho C-H functionalization. Deuterium-labeling experiments indicated that the arylpalladium hydride complex is a key intermediate via oxidative addition. Various functional groups tolerate the present transformation to give the corresponding products.

Published
2012

5. ChemInform Abstract: Palladium-Catalyzed Cycloaddition of Alkynyl Aryl Ethers with Internal Alkynes via Selective ortho C-H Activation

Author

Tamejiro Hiyama, Yuki Shiraishi, Kotomi Yamada, and Yasunori Minami

Subjects
chemistry.chemical_compound, chemistry, Aryl, chemistry.chemical_element, General Medicine, Medicinal chemistry, Cycloaddition, Catalysis, Palladium
Abstract

Silylalkynyl aryl ethers and internal alkynes give under optimized conditions silylmethylidene-substituted chromenes.

Published
2012

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