Zobrazeno 1 - 10
of 178
pro vyhledávání: '"MASASHI OHBA"'
Publikováno v:
Chemical Physics. 419:84-89
We have employed a laser desorption technique combined with supersonic-jet cooling for producing base pairs of adenine nucleosides, adenosine (Ado) and N6,N6-dimethyladenosine (DMAdo) under low-temperature conditions. The resulting base pairs are the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::db413eb1fb7cd42c7f9d5ffbe8c907fa
https://doi.org/10.1016/j.chemphys.2013.01.038
https://doi.org/10.1016/j.chemphys.2013.01.038
Publikováno v:
The Journal of Physical Chemistry A. 114:11231-11237
Monohydration structures of the guanine-guanine and guanine-cytosine base pairs have been elucidated by IR-UV double resonance spectroscopy combined with ab initio calculations. The systems studied consist of the homodimer of 9-methylguanine and the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a127940277f4823d083017f6357fa68d
https://doi.org/10.1021/jp102918k
https://doi.org/10.1021/jp102918k
Autor:
Hitomi Tada, Tomoko Ohkubo, Yutaro Miyamoto, Yasuhito Kobayashi, Yasutaka Tajima, Masashi Ohba, Kazuo Yamazaki
Publikováno v:
HETEROCYCLES. 96:324
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5cbbef31e588a0ff92e2761c406f9e8c
https://doi.org/10.3987/com-17-13857
https://doi.org/10.3987/com-17-13857
Autor:
Itaru Natsutani, Masashi Ohba
Publikováno v:
Tetrahedron. 63:12689-12694
A full account of the total synthesis of 18-demethyl-19-hydroxy-Na-demethyl-Nb-methylsuaveoline (1), the structure assigned to macrocaffrine isolated from Rauwolfia caffra, is presented. The key steps involved are an intramolecular cycloaddition reac
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::337958eadb51496b3ae1e7998882dbb5
https://doi.org/10.1016/j.tet.2007.10.005
https://doi.org/10.1016/j.tet.2007.10.005
Publikováno v:
Tetrahedron. 63:10337-10344
A full account of the highly stereoselective total synthesis of two indole alkaloids, suaveoline ( 4 ) and norsuaveoline ( 5 ), is presented. Central features of the synthetic strategy include the conversion of l -tryptophan methyl ester ( 12 ) into
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ee371b093ee47c4319f1988a0258e366
https://doi.org/10.1016/j.tet.2007.07.070
https://doi.org/10.1016/j.tet.2007.07.070
Autor:
Masashi Ohba, Kei Fukuyama, Aiko Hosoi, Kazuyoshi Takeda, Akihiro Nishibayashi, Yoshinori Okuno, Shigeki Isomura
Publikováno v:
ChemInform. 46
2,4,6-Trichlorobenzoyl-4-dimethylaminopyridine (modified Yamaguchi reagent) is shown to be an efficient reagent for the esterification, that allows to avoid the use of intractable acid chlorides as well as acid anhydrides.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a13f27b6f49289f060a6e98065fe6382
https://doi.org/10.1002/chin.201507057
https://doi.org/10.1002/chin.201507057
Publikováno v:
Chemical and Pharmaceutical Bulletin. 54(1):63-67
A full account of the total synthesis of two monoterpene alkaloids, (-)-plectrodorine [(-)-1] and (+)-oxerine [(+)-3], is presented. The key steps involved are the formation of the oxazole alcohol 10 from the γ-butyrolactone 9 and the intramolecular
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b4152b250b66a283a8880673322ba3a3
http://hdl.handle.net/2297/7559
http://hdl.handle.net/2297/7559
Publikováno v:
Tetrahedron Letters. 45:6471-6474
Total synthesis of two Rauwolfia alkaloids, suaveoline ( 1 ) and norsuaveoline ( 2 ), has been achieved through a highly stereoselective route starting from l -tryptophan methyl ester ( 9 ) and exploiting the intramolecular Diels–Alder reaction of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0692f3e86d8a026575361ea731517c65
https://doi.org/10.1016/j.tetlet.2004.06.108
https://doi.org/10.1016/j.tetlet.2004.06.108
Autor:
Masashi Ohba, Itaru Natsutani
Publikováno v:
Heterocycles. 63(12):2845-2850
A synthesis of Na-demethyl-20-deethylsuaveoline (1), the structure assigned to the Rauwolfia alkaloid sellowiine, has been accomplished for the first time through a route using intramolecular oxazole-olefin Diels-Alder reaction. The 1 H- and 1 3 C-NM
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d116c1e20db00a49b9ce0d0ad17c8ed1
http://hdl.handle.net/2297/3277
http://hdl.handle.net/2297/3277
Autor:
Keisuke Uji, Midori Tabata, Keitaro Suzuki, Kazuaki Ohyama, Sachiko Yanagihara, Kazuo Yamazaki, Tetsuji Hosono, Ai Tatara, Mai Aritake, Shungo Takamoto, Kei Ogiso, Masashi Ohba, Takumi Sugahara
Publikováno v:
HETEROCYCLES. 94:503
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d71f02e6f7dbfb197e00afda73826adc
https://doi.org/10.3987/com-16-13638
https://doi.org/10.3987/com-16-13638