Results 181 to 190 of about 2,581 (218)

Chemie der Ginkgolide, II. Isolierung und Strukturaufklärung eines neuen Ginkgolids

Liebigs Annalen der Chemie, 1987
AbstractAus Blättern des Ginkgo‐Baumes wird ein neues Ginkgolid (5) isoliert, das wir als Ginkgolid J bezeichnen. Die Strukturaufklärung gelang sowohl mit spektroskopischen Methoden als auch durch chemischen Korrelation mit Ginkgolid C.
Klaus Weinges, Michael Hepp, Hermann Jaggy   +2 more
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Extraction of ginkgolides from Ginkgo biloba

China Journal of Chinese Matera Medica, 2010
To establish the technology for extraction of ginkgolides from Ginkgo Biloba with alcohol-water.The parameters such as alcohol concentration, pH of extracting solution, ratio of dosage liquor, temperature and time, the extraction of ginkgolides from G.
Jun, He, Shuo, Yang, Jianian, Yang, Xiaohong, Qing   +3 more
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Extraction, isolation and purification for Ginkgolide B

China Journal of Chinese Materia Medica, 2010
To establish a simple extraction, isolation and purification method for ginkgolide B from ginkgo leaf.The optimum conditions of extraction, isolation and purification were studied by taking the transfer rate of ginkgolide B as index.Ginkgo leaf was extracted with 70% ethanol for three times, the extracts were concentrated to remove ethanol and diluted ...
Chenfeng, Zhang, Minghui, Li, Yun, Tang, Yanhai, Zhang, Min, Shi, Longsheng, Sheng   +5 more
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Determination of the derivative from ginkgolide B

Natural Product Research, 2008
A new compound decomposed from ginkgolide B(GB) is discovered and identified by MS and UV spectrum. It is the dehydrate of GB, which was named as ginkgolide K before. Differently, it cannot exist independently, but only in equilibrium with GB. It is found first time that 3-hydroxy is active in some solvent.
Chuanxun, Yuan, Jian, Pan, Xueqiao, Hu
openaire   +2 more sources

Chemistry of Ginkgolides, VII. Preparation and Crystal Structure Analysis of a Secondary Ozonide from Ginkgolide A

Liebigs Annalen, 1997
AbstractBy hydrogenation of 3,14‐didehydro‐10‐hydroxyginkgolide (3,14‐anhydroginkgolide A, 1) the 3,14‐didehydro‐10‐hydroxyginkgolide‐15‐acid (2) was obtained. Reaction with diazomethane led to the methyl ester 2a, which was transformed into its MOM derivative 2b.
Klaus Weinges, Hartmut Schick, Hans Pritzkow   +2 more
openaire   +1 more source

The Total Synthesis of (±)-Ginkgolide B

Journal of the American Chemical Society, 2000
The total synthesis of the potent PAF antagonist ginkgolide B has been accomplished. The complex architecture of ginkgolide B which includes six rings, eleven stereogenic centers, ten oxygenated carbons, and four contiguous fully substituted carbons is a daunting challenge for chemical synthesis. The synthesis of ginkgolide B was accomplished through a
Michael T. Crimmins, Jennifer M. Pace, Philippe G. Nantermet, Agnes S. Kim-Meade, James B. Thomas, Scott H. Watterson, Allan S. Wagman   +6 more
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Ionization Constants of Ginkgolide B in Aqueous Solution

Analytical Chemistry, 1996
The thermodynamic ionization constants (pK(a)(1), pK(a)(2), and pK(a)(3)) of ginkgolide B (9H-1,7a-(epoxymethano)-1H,6aH-cyclopenta[c]furo[2,3-b]furo-[3',2':3,4]cyclopenta[1,2-d]furan-5,9,12-(4H)-trione, 3-tert-butylhexahydro-4,7b,11-trihydroxy-8-methyl-) in aqueous solution have been settled by pH-metric and NMR studies.
O, Zekri, P, Boudeville, P, Genay, B, Perly, P, Braquet, P, Jouenne, J L, Burgot   +6 more
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Ginkgolides and Bilobalide: Their Physical, Chromatographic and Spectroscopic Properties

ChemInform, 2005
AbstractFor Abstract see ChemInform Abstract in Full Text.
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The ginkgolides. IV. Stereochemistry of the ginkgolides

Tetrahedron Letters, 1967
M. Maruyama, A. Terahara, Y. Nakadaira, M.C. Woods, Y. Takagi, K. Nakanishi   +5 more
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The ginkgolides. III. The structure of the ginkgolides

Tetrahedron Letters, 1967
M. Maruyama, A. Terahara, Y. Nakadaira, M. C. Woods, K. Nakanishi   +4 more
openaire   +1 more source