Zobrazeno 1 - 10
of 25
pro vyhledávání: '"Junya Higashi"'
Autor:
Tetsuo Okujima, Taku Shoji, Junya Higashi, Masafumi Yasunami, Noboru Morita, Shunji Ito, Akifumi Maruyama
Publikováno v:
HETEROCYCLES. 89(11):2588-2603
Preparation of 2-aryl- and 6-heteroarylazulenes 2-6 and 8-10 was established by the palladium-catalyzed cross-coupling reaction of the corresponding haloazulenes with lithium aryl- and heteroarylmagnesium ate complexes, which were readily prepared fr
Autor:
Kozo Toyota, Tetsuo Okujima, Junya Higashi, Taku Shoji, Mitsuhisa Maruyama, Noboru Morita, Shunji Ito, Akifumi Maruyama
Publikováno v:
Bulletin of the Chemical Society of Japan. 87:141-154
6-Methoxy- and 6-dimethylaminoazulenes with methylthio groups at the 1- or 1,3-positions have been prepared by electrophilic substitution of the corresponding azulenes with DMSO in the presence of ...
Publikováno v:
European Journal of Organic Chemistry. 2011:584-592
Novel bis(3-methylthio-1-azulenyl) methyl cations 3a(+) and 3b(+) and dications 4a(2+) and 4b(2+) were synthesized by the hydride abstraction reaction of the corresponding hydride derivatives 7a, 7b, 8a, and 8b, which were readily prepared by the aci
Publikováno v:
European Journal of Organic Chemistry. 2009:5948-5952
Ferrocenylmethylene-bridged calix[4]azulene derivative 3 and bis(1-azulenyl)ferrocenylmethane derivative 4 were obtained by the reaction of 6-tert-butylazulene (6) with ferrocenecarbaldehyde (7) in acetic acid. The new bis(1-azulenyl)ferrocenylmethyl
Autor:
Taku Shoji, Masafumi Yasunami, Noboru Morita, Kozo Toyota, Ryuji Yokoyama, Tetsuo Okujima, Junya Higashi, Shunji Ito
Publikováno v:
European Journal of Organic Chemistry. 2009:1554-1563
Electrophilic ipso-substitution reactions between 1,3,6-tri-tert-butylazulene (2) and several electrophilic reagents were examined. Friedel–Crafts and Vilsmeier reactions of 2 gave the corresponding ipso-substitution products in moderate to excelle
Autor:
Kozo Toyota, Junya Higashi, Kunihide Fujimori, Toyonobu Asao, Noboru Morita, Shunji Ito, Taku Shoji, Masafumi Yasunami
Publikováno v:
European Journal of Organic Chemistry. 2008:1242-1252
The reaction of azulenes with several sulfoxides in the presence of acid anhydrides to afford the corresponding 1-azulenylsulfonium and 1,3-azulenediyldisulfonium ions is reported. The subsequent conversion of these ions in high yields into 1-azuleny
Autor:
Junya Higashi, Kozo Toyota, Noboru Morita, Shunji Ito, Shigeru Kikuchi, Masataka Watanabe, Taku Shoji, Masafumi Yasunami, Kazuyuki Okada
Publikováno v:
ResearcherID
5-Isopropyl-2H-cyclohepta[b]furan-2-one (1) reacted with DMSD to give dimethyl(5-isopropyl-2-oxo-2H-cyclohepta[b]furan-3-yl)sulfonium trifluoromethanesulfonate (2), which was treated with E(t)3N to give 5-isopropyl-3-methylthio-2H-cyclohepta[b]furan-
Autor:
Tetsuo Okujima, Noboru Morita, Junya Higashi, Shunji Ito, Taku Shoji, Masafumi Yasunami, Akifumi Maruyama
Publikováno v:
ChemInform. 46
2- and 6-arylazulene substrates (III) and (VIII) are prepared by cross-coupling of aryl halides (I) with 2- or 6-haloazulene (II) and (VII).
Autor:
Junya Higashi, Taku Shoji, Yuta Inoue, Noboru Morita, Shunji Ito, Atsuyo Yamamoto, Erika Shimomura
Publikováno v:
Chemistry Letters. 41:1644-1646
The synthesis of azulene-substituted polymethine dyes 3–6 was established by the Zincke-type ring-opening reaction of pyridinium salt 2 with several secondary amines, followed by the alumina-cataly...
Autor:
Mitsuhisa Maruyama, Noboru Morita, Shunji Ito, Akifumi Maruyama, Taku Shoji, Tetsuo Okujima, Junya Higashi, Kozo Toyota
Publikováno v:
ChemInform. 45
The synthesis of 1-methylthio- and 1,3-bis(methylthio)azulenes with an electron-donating group at the 6-position as well as their transformation into the corresponding novel 1,1′-bisazulene derivatives [cf.