Zobrazeno 1 - 10
of 32
pro vyhledávání: '"Tatsuhiro Tokunaga"'
Autor:
Tomohisa Ogawa, Katsuyoshi Hoshino, Shuji Yasuike, Tatsuhiro Tokunaga, Jyoji Kurita, Kentaro Yamaguchi, Hiroko Seki
Publikováno v:
The Journal of Physical Chemistry B. 108:18698-18704
The electrochemical behaviors of a series of four intramolecular hypervalent complexes containing Sb···N bonding (antimony (III, V) compounds) and of the relevant common precursors, organonitrogen and (tri- and penta-) substituted stibines, have b
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::537db88bbb2d518bc59819b59ee788c9
https://doi.org/10.1021/jp040587u
https://doi.org/10.1021/jp040587u
Autor:
Hiroko Seki, Tsutomu Ishikawa, Tatsuhiro Tokunaga, Masahiro Suzukawa, Keiro Higuchi, Hiroyo Kabasawa, Keiko Yanagisawa, Masako Ikeno
Publikováno v:
Helvetica Chimica Acta. 85:2636-2643
The chemistry of N-hydroxyguanidines, focusing on photo-sensitized oxygenation and reaction with nitric oxide (NO), was examined. In the former reaction, a urea derivative was obtained as the main product together with the generation of NO. On the ot
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::74d0771e992612e0df6682fe1c490fed
https://doi.org/10.1002/1522-2675(200209)85:9<2636::aid-hlca2636>3.0.co
https://doi.org/10.1002/1522-2675(200209)85:9<2636::aid-hlca2636>3.0.co
Autor:
Ryuji Tsuzuki, Katsumi Sudoh, Susumu Watanuki, Jun-Ichi Kazami, Shin-ichi Tsukamoto, Isao Yanagisawa, Tatsuhiro Tokunaga, Hironori Harada, Akihiro Tanaka, Akira Fujimori
Publikováno v:
Chemical and Pharmaceutical Bulletin. 49:1593-1603
In the previous paper, we described a series of the 2-arylethenesulfonamide derivatives, a novel class of ETA-selective endothelin (ET) receptor antagonists, including the compounds 1a, b. Compound 1a showed excellent oral antagonistic activities and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::65f740f68a330e019f1488ddd6c02401
https://doi.org/10.1248/cpb.49.1593
https://doi.org/10.1248/cpb.49.1593
Autor:
Jyoji Kurita, Tatsuhiro Tokunaga, Masaaki Ikoma, Syuji Yasuike, Kentaro Yamaguchi, Hiroko Seki
Publikováno v:
Tetrahedron. 56:8833-8839
Hypervalent Sb⋯N bonding observed in triarylstibanes was investigated by single-crystal X-ray diffraction study, comparison of the 15N chemical shifts, and HMBC NMR spectroscopic detection of the 1H–13C long-range coupling. This bonding is strong
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e40fc3b96fbb5506a5b37e0c841d6993
https://doi.org/10.1016/s0040-4020(00)00813-9
https://doi.org/10.1016/s0040-4020(00)00813-9
Autor:
Keiko Fukuda, Tatsuhiro Tokunaga, Tsutomu Ishikawa, Kentaro Yamaguchi, Toshio Isobe, Hiroko Seki
Publikováno v:
The Journal of Organic Chemistry. 65:7774-7778
Simple preparation methods for modified guanidines were explored for new chiral superbases. Thus, (4S,5S)-4,5-diphenyl- and diastereomeric cyclohexane-fused 2-iminoimidazolidines were prepared from (1S,2S)-1,2-diphenylethylenediamine and (1R,2R)- or
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::08bf141674064cf5ce939a3b411a0b5c
https://doi.org/10.1021/jo000745n
https://doi.org/10.1021/jo000745n
Autor:
Keiko Fukuda, Tatsuhiro Tokunaga, Toshio Isobe, Kentaro Yamaguchi, Tsutomu Ishikawa, Hiroko Seki
Publikováno v:
The Journal of Organic Chemistry. 65:7779-7785
Simple preparation methods of modified guanidines have been explored as potential chiral superbases. Thus, 3,7,8-trisubstituted and 3,6,7, 8-tetrasubstituted 1,4,6-triazabicyclooctene systems were prepared from (1S,2S)-1,2-diphenylethylenediamine thr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e8a57b424f872fd5c7e6c21057a713ec
https://doi.org/10.1021/jo000746f
https://doi.org/10.1021/jo000746f
Publikováno v:
Tetrahedron. 56:2935-2939
Selective and double-selective J -HMBC 2D methods were developed and employed to determine the coupling constants of harman ( 1 ). The 1 H– 13 C and 1 H– 15 N long-range coupling constants could be accurately determined without interference from
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::54eeeafa7d88c70bb12dd5f942c5c3b3
https://doi.org/10.1016/s0040-4020(00)00175-7
https://doi.org/10.1016/s0040-4020(00)00175-7
Autor:
Jyoji Kurita, Shuji Yasuike, Masaaki Ikoma, Tatsuhiro Tokunaga, Kentaro Yamaguchi, Hiroko Seki
Publikováno v:
Tetrahedron Letters. 41:1031-1034
Direct evidence of intramolecular Sb···N nonbonded interaction was obtained by means of 1H–13C and 1H–15N heteronuclear multiple bond correlation (HMBC) experiments. The long-range coupling constants between 1H and 13C nuclei through antimony
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ca2d4f632cc7761208b2f43747d15d65
https://doi.org/10.1016/s0040-4039(99)02189-9
https://doi.org/10.1016/s0040-4039(99)02189-9
Publikováno v:
The Journal of Antibiotics. 49:811-814
YM-24074 (formerly called YL-01869P) is a new antibiotic and type I collagenase inhibitor. The structure of this compound was elucidated by spectroscopic analysis and confirmed by acid degradation to be N-(1"-acetyl-3"-methylbutyl)-2- [2'-[(N-hydroxy
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::092d43d148c19e868773692343735077
https://doi.org/10.7164/antibiotics.49.811
https://doi.org/10.7164/antibiotics.49.811
Autor:
Motoo Morioka, Mitsuyoshi Shibazaki, Tatsuhiro Tokunaga, Yasuto Suzuki, Ratna Murni Rantiatmodjo, B. Setiawan, Kazuma Kamigiri, Kenichi Suzuki
Publikováno v:
The Journal of Antibiotics. 49:136-139
Novel antibacterial antibiotics, kalimantacins A, B and C, have been isolated from the fermentation broth of Alcaligenes sp. YL-02632S. In this paper, the taxonomy of the producing strain, fermentation, isolation and biological activities of kalimant
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8bab5d8b9b4efabf61f640c499644156
https://doi.org/10.7164/antibiotics.49.136
https://doi.org/10.7164/antibiotics.49.136