A new C-glycosylflavone,5-hydroxyl-4′,7-dimethoxyflavone-6-C-[0-(α-L-3″-acetylrhamno-pyranosy)-1→2-β-D-glucopyranoside](1),along with five known C-glycosylflavones,5-hydroxy-4′,7-dimethoxyfavone-6-C-[0-(α-L-2′″-acetylrhamnopyranosy1)-1→2-β-D-glucopyranoside](2),embinin(3),embigenin(4),swertisin(5)and swertiajaponin(6)were isolated from the leaves of Iris tectorum Maxim.Their structures were elucidated on the basis of extensive NM R experiments and spectral methods and their cytotoxic activities against A 549(lung cancer)human cell lines were determined.
Two new acylated C-glycosylflavones were isolated from the leaves of Iris lactea var. chinensis, and their structures were elucidated on the basis of extensive NMR experiments and mass spectrometry methods and were assigned as 5-hydroxy-4＇- methoxyflavone-7-O-（β-D-2＇＇＇＇4＇＇＇＇-diacetylrhamnopyranosyl）-6-C-[ O-（α-L-6＇＇＇-acetyl-glucpyranosyl）-1→2-β-D-glucopyrano- side] （irislactin A） and 5-hydroxy-4＇,7-dimethoxyflavone-6-C-[O-（α-L-2＇＇＇,3＇＇＇-diacetylrhanmo-pyranosyl）-1→ 2-β-D-glucopyranoside] （irislactin B）.
Two new C-glycosylflavones were isolated from the whole plant of Mimosa pudica, and their structures were determined as 6,7,3＇,4＇-tetrahydroxyl-8-C-[α-L-rhamnopyranosyl-（1 → 2）]-β-D-glucopyranosyl flavone （1）, 5,7,3＇,4＇-tetrahydroxy-8-C[β-D- apiose-（1 → 4）]-β-D-glycopyranosyl flavone （2）. Their structures elucidated by chemical and spectroscopic analysis including IR, MS, 1D and 2D NMR spectra.
目的研究海南含羞草(M im osa pudica)的化学成分。方法利用D iaion HP-20,Toyopearl HW-40,MC I-Gel CHP-20,Sephadex LH-20,RP18及硅胶等柱色谱法对海南含羞草成分进行分离纯化,根据理化性质和光谱数据鉴定化合物的结构。结果分离鉴定了4个化合物:7,8,3,′4′-四羟基-6-C-[α-L-鼠李糖-(1→2)]-β-D-葡糖黄酮碳苷(I),5,7,4′-三羟基-8-C-[α-L-鼠李糖(1→2)]-β-D-葡糖黄酮碳苷(II),5,7,3,′4′-四羟基-6-C-[α-L-鼠李糖-(1→2)]-β-D-葡糖黄酮碳苷(III),儿茶素(IV)。结论化合物I为新化合物,化合物II^IV为首次从该植物中分离得到。
