Zobrazeno 1 - 10
of 31
pro vyhledávání: '"Etsuji Yamanaka"'
Publikováno v:
Tetrahedron Letters. 33:4959-4962
Structure of DHG, a depolymerized glycosaminoglycan from sea cucumber was determined to be a fucose-branched chondroitin 4,6-sulfate by means of chemical degradation and 2D-NMR spectroscopy.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0c8ad28835f4014ebab364829835459e
https://doi.org/10.1016/s0040-4039(00)61245-5
https://doi.org/10.1016/s0040-4039(00)61245-5
Publikováno v:
Chemical and Pharmaceutical Bulletin. 38:1702-1706
We investigated the selectivities and structure requirements for alpha-1 and alpha-2 adrenoceptor blocking activities of yohimbine (YO) and its 12 related analogs, such as β-yohimbine (β-YO), dihydrocorynantheine (DHC) and (-)indoloquinolizidine ((
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::305777604d2ded211de8d8d92ef79253
https://doi.org/10.1248/cpb.38.1702
https://doi.org/10.1248/cpb.38.1702
Autor:
Shin-ichiro Sakal, Masaki Yokota, Mariko Kitajima, Sumphan Wongseripatana, Norio Aimi, Dhavadee Ponglux, Etsuji Yamanaka
Publikováno v:
Tetrahedron Letters. 27:4585-4588
11-Methoxykoumine (13) was derived from 18-hydroxygardnerine (4) through C-C intramolecular bond formation by Pdo catalysis between the indole part and allylic cation in an indole alkaloid. This is first example of the proof for the biogenetic route
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a8fd174f4cae8d1d1ca7c9906f6c1023
https://doi.org/10.1016/s0040-4039(00)85010-8
https://doi.org/10.1016/s0040-4039(00)85010-8
Publikováno v:
Tetrahedron Letters. 16:719-722
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::33d4612433557491641924d7c148f1c8
https://doi.org/10.1016/s0040-4039(00)71966-6
https://doi.org/10.1016/s0040-4039(00)71966-6
Publikováno v:
YAKUGAKU ZASSHI. 95:1511-1516
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ef8ed06a5ce90fe8446eb1b1260a3fc0
https://doi.org/10.1248/yakushi1947.95.12_1511
https://doi.org/10.1248/yakushi1947.95.12_1511
Publikováno v:
YAKUGAKU ZASSHI. 103:1028-1033
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e89296aa794dcd5da73a2560a03f532b
https://doi.org/10.1248/yakushi1947.103.10_1028
https://doi.org/10.1248/yakushi1947.103.10_1028
Publikováno v:
Chemical and Pharmaceutical Bulletin. 30:2068-2076
Oxindole alkaloids chosen as starting materials were isopteropodine (1a) pteropodine (1b) isoformosanine (7a) and formosanine (7b). Reduction of the iminoethers prepared from the oxindole alkaloids with Et3 O^+B^-F4, with NaBH3 (OAc) or with NaBH4/Sn
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7780e7bd9e94e1c149363739fcd8bd13
https://doi.org/10.1248/cpb.30.2068
https://doi.org/10.1248/cpb.30.2068
Autor:
Kunie Nagashima, Keiko Nakayama, Mayumi Yamauchi, Etsuji Yamanaka, Shin-ichiro Sakai, Noriko Yanagishima
Publikováno v:
Chemical and Pharmaceutical Bulletin. 28:2527-2530
A convenient synthesis of 1, 2, 3, 4, 6, 7, 12, 12b-octahydroindolo [2, 3-a] quinolizine (1) is described. The condensation of tryptamine (2) with diethyl (2-formylethyl) malonate (3a), followed by treatment with alkali, gave the lactam ester (5a). D
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c675633fb267943240d2e218183590be
https://doi.org/10.1248/cpb.28.2527
https://doi.org/10.1248/cpb.28.2527
Autor:
Keiichi Yamaguchi, Katsumi Hotoda, Toshihiko Okamoto, Ichiro Yamamoto, Joju Haginiwa, Etsuji Yamanaka, Norio Aimi, Shin-ichiro Sakai
Publikováno v:
YAKUGAKU ZASSHI. 104:222-237
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e0ac1818432d52e6c255367d1781abd4
https://doi.org/10.1248/yakushi1947.104.3_222
https://doi.org/10.1248/yakushi1947.104.3_222
Autor:
Junko Kurita, Morio Fujiu, Etsuji Yamanaka, Joju Haginiwa, Norio Aimi, Shin-ichiro Sakai, Nobuo Shinma
Publikováno v:
Chemical and Pharmaceutical Bulletin. 25:2067-2071
Two minor alkaloids were newly isolated from Uncaria rhynchophylla MIQ., and their structures elucidated as geissoschizine methyl ether (a new compound) and akuammigine, respectively. The Cotton effect due to the chirality of the E ring of heteroyohi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::feed071999ac3efa090d994fcb89b378
https://doi.org/10.1248/cpb.25.2067
https://doi.org/10.1248/cpb.25.2067