Výsledky vyhledávání - "Mamiko Hayakawa"

Simple methods for the synthesis of N-substituted acryl amides using Na2CO3/SiO2 or NaHSO4/SiO2

Autor: Mamiko Hayakawa, Kenshiro Tashiro, Daiki Sumiya, Tadashi Aoyama

A simple and efficient procedure for the synthesis of N-substituted acryl amides has been developed using Na2CO3/SiO2 or NaHSO4/SiO2. Na2CO3/SiO2 smoothly acts as a base in the reaction between acryloyl chloride and a variety of amines to obtain thei

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Akademický článek

Diastereoselective photochemical radical addition of a cyclic ether to olefins: addition of THF radicals to dialkyl maleates.

Autor: Mamiko Hayakawa¹, Tadashi Aoyama¹, Akihiko Ouchi¹ ouchi.akihiko@nihon-u.ac.jp

Publikováno v: ARKIVOC: Online Journal of Organic Chemistry. 2021, Vol. 2021, p145-154. 10p.

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A Facile Approach to the Synthesis of 3-Acylisoxazole Derivatives with Reusable Solid Acid Catalysts

Autor: Mamiko Hayakawa, Ken-ichi Itoh, Kenta Hasegawa, Shinji Takahashi, Rina Abe, Tadashi Aoyama

Publikováno v: Synthesis. 53:4636-4643

Nitrile oxides were formed from α-nitro ketones using silica gel-supported sodium hydrogen sulfate (NaHSO4/SiO2) or Amberlyst 15 as solid acid catalyst, and then the corresponding 3-acylisoxaszoles were obtained by reacting with alkynes via the 1,3-

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::68d071d71bf8541c65b3d2fc85bb4a22
https://doi.org/10.1055/a-1581-0235

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Diastereoselective photochemical radical addition of a cyclic ether to olefins: addition of THF radicals to dialkyl maleates

Autor: Akihiko Ouchi, Mamiko Hayakawa, Tadashi Aoyama

Publikováno v: Arkivoc. 2021:145-154

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::176f45961e892ae92d66593f8de5d231
https://doi.org/10.24820/ark.5550190.p011.509

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Rate constant for the generation of 1O2 from commonly used triplet sensitizers: a systematic study of the wavelength effect using the ene reaction of 2,3-dimethyl-2-butene

Autor: Mamiko Hayakawa, Tadashi Aoyama, Akihiko Ouchi

Publikováno v: Arkivoc. 2020:81-93

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1f49f817517c4547396167ea3611f785
https://doi.org/10.24820/ark.5550190.p011.388

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Novel synthesis of 1,4-thiazin-2-one O-(tert-butyl) oximes and benzo[b][1,4]thiazin-2-one O-(tert-butyl) oximes in the presence of K2CO3/SiO2

Autor: Shigeru Shimada, Kenshiro Tashiro, Akihiko Ouchi, Tadashi Aoyama, Mamiko Hayakawa

Publikováno v: Tetrahedron Letters. 60:1493-1497

A simple and efficient method was developed for the synthesis of 1,4-thiazin-2-one O-(tert-butyl) oximes and benzo[b][1,4]thiazin-2-one O-(tert-butyl) oximes from N-tert-butoxy acyl imidoyl bromides and 2-aminothiols in the presence of K2CO3/SiO2. Tw

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https://doi.org/10.1016/j.tetlet.2019.04.053

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Integration of a Four-Step Reaction into One-Pot under the Coexistence of Silica-Gel-Supported Acid and Base Reagents: Synthesis of Benzo- and Naphthothiophenes Using NaHSO4/SiO2 and Na2CO3/SiO2

Autor: Tadashi Aoyama, Mamiko Hayakawa, Kyohei Nakaoka, Akihiko Ouchi, Masayuki Kosuge

Publikováno v: Synthesis. 51:2572-2578

A four-step synthesis of benzo- and naphthothiophenes that have biological importance and application in material science was integrated into a one-pot reaction by using silica gel-supported acid and base reagents, NaHSO4/SiO2 and Na2CO3/SiO2. The su

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https://doi.org/10.1055/s-0037-1610866

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A Simple and Efficient One-Pot Synthesis of 3-Acylisoxazolines from Alcohols and α-Nitro Ketones in the Presence of NaHSO4/SiO2

Autor: Tadashi Aoyama, Akihiko Ouchi, Mamiko Hayakawa, Ken-ichi Itoh, Takuya Hanzawa, Natsumi Meguro, Miki Osanai

Publikováno v: European Journal of Organic Chemistry. 2018:6363-6368

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f310ce9aa2944aec3715f850c9353ccf
https://doi.org/10.1002/ejoc.201801196

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A simple and efficient method for the synthesis of 5,6-dihydropyrazin-2(1H)-one O-(tert-butyl)oximes, quinoxalin-2(1H)-one O-(tert-butyl)oximes and its derivatives

Autor: Tadashi Aoyama, Mamiko Hayakawa, Akihiko Ouchi, Shigeru Shimada, Kenshiro Tashiro

Publikováno v: Tetrahedron Letters. 59:4116-4119

A simple and efficient method was developed for the synthesis of 5,6-dihydropyrazin-2(1H)-one O-(tert-butyl)oximes, quinoxalin-2(1H)-one O-(tert-butyl)oximes and its derivatives from N-tert-butoxy acyl imidoyl bromide and diamines. Twenty three novel

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::96bf4f7a3d4b0024e70f3cd47cf1f70f
https://doi.org/10.1016/j.tetlet.2018.10.015

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Sunlight-induced C C bond formation reaction: Radical addition of alcohols/ethers/acetals to olefins

Autor: Mamiko Hayakawa, Hisashi Shirota, Ryuusei Yamada, Souta Hirayama, Akihiko Ouchi, Tadashi Aoyama

Publikováno v: Journal of Photochemistry and Photobiology A: Chemistry. 413:113263

A sunlight-induced C C bond formation reactions upon the addition of alcohols/ethers/acetals to olefins proceeded efficiently using di-tert-butyl peroxide (DTBP). The reactions proceeded faster than many of the previously reported sunlight and many c

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::38d03facf6be9cf095cc730c1bdaf015
https://doi.org/10.1016/j.jphotochem.2021.113263

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