1,2(3)-Tetrahydro-3,3′-biplumbagin: A naphthalenone and other constituents from Plumbago zeylanica
作者:G.M.Kamal B. Gunaherath、A.A.Leslie Gunatilaka、M.Uvais S. Sultanbawa、S. Balasubramaniam
DOI:10.1016/0031-9422(83)80232-5
日期:1983.1
Abstract The isolation of plumbagin, droserone, isoshinanolone and a new naphthalenone, 1,2(3)-tetrahydro-3,3′-biplumbagin is reported from the phenolic fract
compounds were established by spectral analysis. The quinones obtained from the chloroform extract of the fruits were compared with previously reported quinones obtained from ethanol extracts. The quinones in the fruits were categorized in three groups: quinones from ethanol extract only, quinones from chloroform extract only, and quinones from both extracts. The six naphthoquinones, 19-21, 25, 26, and 29,
新二硫菊酯(22),mamegakinone(23),ehretione(24),异羟氯吡菊酯(25)和β-二氢铅素(26)。通过光谱分析确定了新化合物的结构。从水果的氯仿提取物中获得的醌与先前报道的从乙醇提取物中获得的醌进行了比较。水果中的醌分为三类:仅乙醇提取物的醌,仅氯仿提取物的醌和两种提取物的醌。检查了六个萘醌19-21、25、26和29,它们的鱼鳞毒素活性和萌发抑制活性。醌19-21、26和29在10 ppm的浓度下对日本幼鱼(Oryzias latipes var。)表现出鱼毒的活性。醌19至21和26对生菜种子表现出抑制发芽的活性(Lactuca sativa L. var。
Naphthoquinones and triterpenes from some asian Diospyros species
作者:Muhamad Bin Zakaria、J.A.D. Jeffreys、Peter G. Waterman、Shou-Ming Zhong
DOI:10.1016/s0031-9422(00)80490-2
日期:1984.1
Cis- and trans-isoshinanolone from Dioncophyllum thollonii: absolute configuration of two `known', wide-spread natural products1Part 127 in the series `Acetogenic isoquinoline alkaloids'. For part 126, see Bringmann et al., submitted for publication (a).1
作者:Gerhard Bringmann、Miriam Münchbach、Kim Messer、Dagmar Koppler、Manuela Michel、Olaf Schupp、Matthias Wenzel、Adriaan M Louis
DOI:10.1016/s0031-9422(99)00080-1
日期:1999.7
From the rare West African liana, Dioncophyllum thollonii (Dioncophyllaceae), the known acetogenic tetralones, cis- and trans-isoshinanolone, were isolated. Exemplarily on this material, a new ruthenium-catalyzed oxidative degradation procedure, related to the well-established stereoanalysis of 1,3-dimethyltetrahydroisoquinolines lines, was ela berated. The method allo ws to unambiguously attribute the absolute configuration of these natural products, which likewise occur in several other plant species. For the rapid discrimination between the four possible stereoisomeric forms of isoshinanolone (i.e. the cis- and transdiastereomers and their enantiomers), an HPLC-analytical procedure on a chiral stationary phase has been developed. (C) 1999 Elsevier Science Ltd. All rights reserved.
The absolute configuration of (+)-isoshinanolone and in situ LC–CD analysis of its stereoisomers from crude extracts
The absolute configuration of(+)-isoshinanolone, a wide-spread acetogenic metabolite from higher plants, has been determined by X-ray structure analysis of its new dibromide; accordingly, this natural tetralone is 3R,4R-configured, in agreement with previous degradative results. In addition, a first chiroptical on-line stereoanalysis for isoshinanolones is presented, i.a. by HPLC on a chiral phase coupled to CD spectroscopy, giving pure CD spectra of all of the four stereoisomers of isoshinanolone directly from stereoisomeric mixtures. (C) 2001 Elsevier Science Ltd. All rights reserved.