Zobrazeno 1 - 10
of 189
pro vyhledávání: '"Tomohiro Maegawa"'
Publikováno v:
Frontiers in Chemistry, Vol 8 (2020)
An efficient and practical route for the synthesis of α-sanshools and spilanthol is described herein. Several modifications of an existing method enabled the preparation of the (2E,6Z,8E,10E)-tetraene precursor of hydroxy-α-sanshool in good yield.
Externí odkaz:
https://doaj.org/article/0cfaf1ed98964c729798b6922804d32e
Publikováno v:
ACS Omega, Vol 3, Iss 5, Pp 5375-5381 (2018)
Externí odkaz:
https://doaj.org/article/950a79934d9d4a4881b70bc666856206
Publikováno v:
ARKIVOC, Vol 2003, Iss 6, Pp 62-70 (2003)
Externí odkaz:
https://doaj.org/article/31c408b42dcd4662b583d48ca3ce46ae
A concise synthesis of thioaurones via NBS-induced cyclization of MOM-protected 2′-mercaptochalcones
Autor:
Akira Nakamura, Fei Rao, Kazuchika Ukiya, Riko Matsunaga, Shin-ichiro Ohira, Tomohiro Maegawa
Publikováno v:
Organic & Biomolecular Chemistry. 21:1134-1137
Herein we present a simple and efficient method for the synthesis of thioaurones (hemithioindigos) from MOM-protected 2′-mercaptochalcones with NBS and pyridine.
Autor:
Tomohiro Maegawa, Akira Nakamura, Tohko Kine, Haruna Uenishi, Yuri Maki, Yasuhito Kase, Mayo Takagi
Publikováno v:
Synlett.
We have developed a regioselective synthesis of 3,4-disubstituted isoxazoles by using a chalcone-rearrangement strategy. The reaction of β-ketoacetals with hydroxylamine hydrochloride and pyridine afforded the corresponding 3,4-disubstituted isoxazo
Autor:
Yasuyoshi Miki, Tomohiro Maegawa, Ryohei Oishi, Ayumi Maekawa, Kazutoshi Segi, Hiromi Hamamoto, Akira Nakamura
Publikováno v:
Synthesis. 54:4095-4103
We investigated the reaction of ketoximes with hypervalent iodine reagents. A combination of PhI(OAc)2 and BF3·Et2O promoted the Beckmann rearrangement of ketoximes, thus yielding the corresponding amides. From a detailed investigation of the reacti
Autor:
Akira, Nakamura, Fei, Rao, Kazuchika, Ukiya, Riko, Matsunaga, Shin-Ichiro, Ohira, Tomohiro, Maegawa
Publikováno v:
Organicbiomolecular chemistry.
A mild and efficient approach for the synthesis of thioaurones
Autor:
Akira Nakamura, Akira Imamiya, Yuichiro Ikegami, Fei Rao, Harumi Yuguchi, Yasuyoshi Miki, Tomohiro Maegawa
Publikováno v:
RSC advances. 12(47)
We developed a method for highly selective synthesis of two benzofuran isomers, by rearranging and subsequently transforming 2-hydroxychalcones. Depending on the reaction conditions, synthesis of 3-formylbenzofurans, unconventional products, and 3-ac
Autor:
Ryo Murakami, Akira Nakamura, Norihito Kawashita, Kouichi Matsumoto, Tomohiro Maegawa, Kouhei Yamamoto
Publikováno v:
Synthesis. 53:3862-3868
A method for synthesizing six-membered heterocyclic compounds was developed based on the features of O,P-acetals. Sequential reactions of intramolecular cyclization between the methylene carbon atom of O,P-acetal and its electrophilic functional grou
Autor:
Hiroaki Sasai, Yuka Hirose, Ganesh Tatya Kamble, Ankit Kumar, Da-Yang Zhou, Tomohiro Maegawa, Shinobu Takizawa, Takeyuki Suzuki, Makoto Sako, Magnus Rueping, Keigo Higashida, Kevin Kaut
Publikováno v:
Organic Chemistry Frontiers. 8:4878-4885
The catalytic enantioselective oxidative hetero-coupling of arenols using a chiral vanadium(V) complex has been developed. The coupling of hydroxycarbazole derivatives with various arenols provided axially chiral biarenols with high chemo-, regio-, a