Absolute configurations of some oligostilbenes from Vitis coignetiae and Vitis vinifera ‘Kyohou’
摘要:
Hepatotoxic oligostilbenes, (+)-vitisin A and (+)-cis-vitisin A were isolated as a pure form, respectively by the method of recycled HPLC. The structure of cis-vitisin A was confirmed by the photochemical transformation of vitisin A. The absolute configurations of (+)-ampelopsin A, (+)-ampelopsin B, (+)-vitisin A, (+)-cis-vitisin A and (+)-vitisin D were also determined by chemical and spectroscopic methods. (C) 1998 Elsevier Science Ltd. All rights reserved.
Chemical determination of the absolute structures of resveratrol dimers, ampelopsins A, B, D and F
摘要:
The absolute configurations of four stilbenedimers, (+)-ampelopsin- A, (+)-ampelopsins B, (-)-ampelopsins D and (+)ampelopsins F were respectively determined on the basis of chemical evidence. (C) 2002 Elsevier Science Ltd. All rights reserved.
Antitumor agents 200.1 cytotoxicity of naturally occurring resveratrol oligomers and their acetate derivatives
作者:Masayoshi Ohyama、Toshiyuki Tanaka、Tetsuro Ito、Munekazu Iinuma、Kenneth F. Bastow、Kuo-Hsiung Lee
DOI:10.1016/s0960-894x(99)00520-x
日期:1999.10
Eleven resveratrol oligomers and six acetylated derivatives were evaluated for in vitro cytotoxicity against a panel of human tumor cell lines. The acetate of (-)-ampelopsin A (12) showed potent and selective cytotoxic activity with ED50 values of 0.6, 0.7 and 2.0 mu g/mL against KB, 1A9 and MCF-7 cells, respectively. Hopeaphenol (10) and pallidol hexaacetate (13) also showed significant cytotoxicity against KB cells with ED50 values of 1.2 and 1.6 mu g/mL, respectively. (C) 1999 Elsevier Science Ltd. All rights reserved.
Chemical determination of the absolute structures of resveratrol dimers, ampelopsins A, B, D and F
The absolute configurations of four stilbenedimers, (+)-ampelopsin- A, (+)-ampelopsins B, (-)-ampelopsins D and (+)ampelopsins F were respectively determined on the basis of chemical evidence. (C) 2002 Elsevier Science Ltd. All rights reserved.
Absolute configurations of some oligostilbenes from Vitis coignetiae and Vitis vinifera ‘Kyohou’
Hepatotoxic oligostilbenes, (+)-vitisin A and (+)-cis-vitisin A were isolated as a pure form, respectively by the method of recycled HPLC. The structure of cis-vitisin A was confirmed by the photochemical transformation of vitisin A. The absolute configurations of (+)-ampelopsin A, (+)-ampelopsin B, (+)-vitisin A, (+)-cis-vitisin A and (+)-vitisin D were also determined by chemical and spectroscopic methods. (C) 1998 Elsevier Science Ltd. All rights reserved.