The aerial parts of Crotalaria emarginella Vatke (Leguminosae) have afforded a new steroidiridoid, characterized as 1’-hydroxy-isoiridomyrmecinyl- 1’-O-β -3-O-α-stigmast-5-ene, designated as crotasteroiridocin (1), which shows a unique combination of iridoid and sterol units, found very rarely in nature. Furthermore, a rare iridoid glucoside namely, bis-desoxy-dihydro-monotropein (2) has also been isolated from the aerial parts of the plant. The structures of the isolated products were elucidated on the basis of spectral and chemical studies. The anti-inflammatory activity has also been screened, wherein compounds 1 and 2 have shown 25.92% and 28.39% activity respectively, with respect to phenyl butazone against carrageenan employing the rat paw method.
Crotalaria emarginella Vatke(豆科)的地上部分提供了一种新的类固醇萜苷,被描述为1'-羟基-异鼠李素基-1'-O-β-3-O-α-甾醇-5-烯,命名为crotasteroiridocin(1),它显示了在自然界中很少见到的萜苷和甾醇单元的独特组合。此外,还从该植物的地上部分分离出一种罕见的萜苷葡萄糖苷,即双去氧去氢单萜苷(2)。通过光谱和化学研究,阐明了所分离产物的结构。还筛选了其抗炎活性,其中化合物1和2分别显示了25.92%和28.39%的活性,相对于苯丁酸钠,采用大鼠爪法对卡拉胶进行检测。