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Abstract
Two new flavones, siameflavones A and B (1 and 2), together with five known flavones (3–7) were isolated from the stem of Cassia siamea. Their structures were elucidated by spectroscopic methods including extensive 1D and 2D NMR techniques. Compounds 1–5 were evaluated for their anti-tobacco mosaic virus (Anti-TMV) activity. The results showed that compounds 1–5 showed weak anti-TMV activity with inhibition rates in the range of 11.6–18.5%.
Disclosure statement
No potential conflict of interest was reported by the authors.
Additional information
Funding
This research was financially supported by the National Natural Science Foundation of China [grant number 21032085], the program for Innovative Research Team (in Science and Technology) in University of Yunnan Provinve [grant number IRTSTYN 2014-11], the Yunnan University of Nationalities Green Chemistry and Functional Materials Research for Provincial Innovation Team (2011HC008), the National Undergraduates Innovating Experimentation Project (2011HX18), and start-up funds of Yunnan University of Nationalities.