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Three new C-alkylated flavonoids from Desmodium oblongum
Yan-Ping Li1,2, Qiu-Fen Hu3, Gao-Xiong Rao1,2
1a College of Pharmaceutic Science , Yunnan University of Traditional Chinese Medicine , Kunming 650500 , China.
Abstract:
Three new C-alkylated flavonoids, 4'-hydroxy-8-isobutyryl-7-methoxy-6-methyl-flavone (1), 4',7-dimethoxy-8-isobutyryl-6-methyl-flavone (2), and 4',7-dimethoxy-8-isobutyryl-flavone (3), together with three know ones luteolin (4), kaemferol (5), and quercetin (6), were isolated from Desmodium oblongum. Their structures were elucidated by spectroscopic methods, including extensive 1D- and 2D-NMR techniques. Compound 1 showed cytotoxicity against NB4, SHSY5Y, and MCF7 cell lines with IC50 values of 8.5, 6.5, and 7.8 μM; compound 2 showed cytotoxicity against SHSY5Y and PC3 cell lines with IC50 values of 5.0 and 6.8 μM; compound 3 displayed cytotoxicity against SHSY5Y and MCF7 cell lines with IC50 values of 6.4 and 9.4 μM, respectively.
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