Zobrazeno 1 - 10
of 22
pro vyhledávání: '"Masaaki Katai"'
Publikováno v:
Journal of Chemical Crystallography. 34:311-315
The photooxidation with HgO in benzene and the hydrolysis with 2%-KOH in methanol of the grayanotoxin (GTX) derivative (4) gave a 10,20-epoxy-grayanotoxin-II(5). The crystal structure of (5) has been determined by X-ray diffraction at room temperatur
Autor:
Tadamasa Terai, Ken-ichi Sakaguchi, Masami Kusunoki, Jun'ichi Katakawa, Tadahiro Tetsumi, Masaaki Katai, Mamoru Sato
Publikováno v:
Journal of Chemical Crystallography. 32:39-42
The crystal and molecular structure of a new diterpenyl glycoside, Ptr-1, is presented. The crystal is triclinic, space group P1, with a = 8.2414(8) A, b = 13.0826(9) A, c = 6.1427(8) A, α = 95.345(9)°, β = 111.589(8)°, γ = 96.726(7)°, V = 604.
Autor:
Jun'ichi Katakawa, Tadamasa Terai, Masaaki Katai, Mamoru Sato, Ken-ichi Sakaguchi, Tadahiro Tetsumi
Publikováno v:
Journal of Chemical Crystallography. 30:573-576
The crystal and molecular structure of a grayanotoxin VII is presented. The crystal is monoclinic, space group P21, with a = 7.647(1) A, b = 11.7591(7) A, c = 10.0873(6) A, β = 91.143(8)°, V = 906.9(1) A3, Z = 2. The structure was solved by direct
Publikováno v:
Journal of Chemical Crystallography. 26:153-156
The crystal and molecular structure of a grayanotoxin III derivative, 6-0-acetylgrayanotoxin III is presented. The crystal is orthorhombic, space group P212121, witha=15.582(3),b=21.304(3),c=6.339(3)A,V=2104(1) A3Z=4. The structure was solved by dire
Autor:
Tadahiro Tetsumi, Isao Narama, Mamoru Sato, Masaaki Katai, Tetsuro Matsuura, Jun'ichi Katakawa, Daisuke Araho, Tadamasa Terai, Kanehiro Osakabe
Publikováno v:
ChemInform. 31
The structure of iso-grayanotoxin II, a new diterpenoid from Leucothoe grayana MAX., has been determined as 3 beta,5 beta,6 beta,14 beta,16 alpha-pentahydroxygrayanotox-9(10)-ene by spectroscopic and X-ray crystallographic analysis. The lethal dosage
Autor:
Masaaki Katai, Tadahiro Tetsumi, Jun'ichi Katakawa, Daisuke Araho, Kanehiro Osakabe, Tadamasa Terai, Tetsuro Matsuura, Mamoru Sato, Isao Narama
Publikováno v:
Chemical and Pharmaceutical Bulletin. 48:142-144
The structure of iso-grayanotoxin II, a new diterpenoid from Leucothoe grayana MAX., has been determined as 3 beta,5 beta,6 beta,14 beta,16 alpha-pentahydroxygrayanotox-9(10)-ene by spectroscopic and X-ray crystallographic analysis. The lethal dosage
Autor:
Jun'ichi Katakawa, Tadahiro Tetsumi, Mamoru Sato, Tadamasa Terai, Ken-ichi Sakaguchi, Masaaki Katai
Publikováno v:
Journal of Chemical Crystallography. 30:139-141
The crystal and molecular structure of a grayanotoxin derivative, iso-grayanotoxin II, is presented. The crystal is orthorhombic, space group $$P2_1 2_1 2_1 ,{\text{ with }}a{\text{ = 12}}{\text{.357(1) }}{\AA}{\text{, }}b{\text{ = 23}}{\text{.354(1)
Autor:
Tadamasa Terai, Tetsuro Matsuura, Tadahiro Tetsumi, Kanehiro Osakabe, Jun'ichi Katakawa, Isao Narama, Masaaki Katai, Ken-ichi Sakaguchi
Publikováno v:
Chemicalpharmaceutical bulletin. 51(3)
Novel 9alpha and 9beta-hydroxy grayanotoxin II derivatives were prepared by photo-sensitized oxygenation of iso-grayanotoxin II and oxidation of grayanotoxin II tetraacetate with selenium dioxide respectively. The lethal dosage of 9alpha and 9beta-hy
Publikováno v:
Bulletin of the Chemical Society of Japan. 67:866-868
The three-dimensional structure of asebotoxin IV has been determined by X-ray diffraction at room temperature. The crystals are triclinic, space group P1, with a = 9.934(2), b = 8.8746(9), c = 7.0073(9) A, α = 71.05(1), β = 80.04(1), γ = 70.71(1)
Publikováno v:
Bulletin of the Chemical Society of Japan. 65:2836-2838
The structure of 3,6-dioxograyanotoxin I ((14R)-14-acetoxy-5,10,16-trihydroxygrayanotoxane-3,6-dione) is based on four rings with various conformations. The mutual ring junction of the molecule is the same as that of grayanotoxin I.