科研之友
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摘要
Two new phenolic compounds, 6-hydroxy-7-methoxy-3-(4-methoxyphenyl)-2H-chromen-2-one (1) and 7-hydroxy-6-methoxy-3-(4-methoxyphenyl)-2H-chromen-2-one (2), together with six known phenols (3-8), were isolated from the stems of Cassia siamea. The structure of 1-8 was elucidated by spectroscopic methods including extensive 1D and 2D NMR techniques. Compounds 1-8 were evaluated for their anti-tobacco mosaic virus (anti-TMV) activity. The results showed that compounds 1 and 2 have potential anti-TMV activity with inhibition rates of 28.2 and 23.5%, respectively. Compounds 3-8 also showed anti-TMV activity with inhibition rates in the range of 11.6-19.8%.
