Inhibitors of cAMP Phosphodiesterase in Medicinal Plants. Part XVIII. Inhibitors of Adenosine 3',5'-Cyclic Monophosphate Phosphodiesterase from Schisandra chinensis and the Structure Activity Relationship of Lignans.
The constituents of Schizandra chinensis Baill. I. Isolation and structure determination of five new lignans, gomisin A, B, C, F and G, and the absolute structure of schizandrin.
Five new dibenzocyclooctadiene lignans, named gomisin A (2), B (3), C (4), F (5) and G (6), were isolated from the petroleum ether extract of fruits of Schizandra chinensis BAILL. (Schizandraceae) and their absolute structures were elucidated by chemical and spectral techniques. The absolute structure of schizandrin (1), the plane structure of which had already been elucidated by Kochetkov et al., was also elucidated on the basis of spectroscopic results.
从五味子果实石油醚提取物中分离得到 5 种新的二苯并环辛二烯木脂素,分别命名为 gomisin A (2)、B (3)、C (4)、F (5) 和 G (6)。通过化学和光谱技术阐明了五味子科(Schizandraceae)及其绝对结构。 Kochetkov等人已经阐明了五味子素(1)的平面结构,并且根据光谱结果也阐明了五味子素(1)的绝对结构。
Anti-aids agents—XXVI. Structure-activity correlations of Gomisin-G-related anti-HIV lignans from Kadsura interior and of related synthetic analogues
Bioactivity-directed fractionation of an ethanolic extract of the stems of Kadsura interior led to the isolation and identification of 12 known lignans (1-12). Seven of these compounds (1, 6, 8-12) were active as anti-HIV agents. Gomisin-G (11) exhibited the most potent anti-HIV activity with EC50 and therapeutic index (TI) Values of 0.006 mu g/mL and 300, respectively. Schisantherin-D (6), kadsuranin (8), and schisandrin-C (10) showed good activity with EC50 values of 0.5, 0.8, and 1.2 mu g/mL, and TI values of 110, 56, and 33.3, respectively. Ten related synthetic biphenyl compounds, five variously substituted bismethylenedioxy, dimethoxy, and dimethoxycarbonyl isomers (18-22) and five brominated derivatives (23-27) also were evaluated for inhibitory activity against HIV-1 replication in acutely infected H9 cells. The total syntheses of two new isomers (21 and 22) are reported for the first time. The anti-HIV data indicated that the relative position and types of substituents on the phenolic hydroxy groups of either the natural lignans or the synthetic biphenyl compounds rather than the numbers of bromine(s) on the aromatic rings art of primary importance. In the cyclooctane ring of the natural lignans, the position and substitution of hydroxy groups are also important to enhanced anti-HIV activity. (C) 1997 Elsevier Science Ltd.