朝藿素B和朝藿素C的结构

EPIMEDOKOREANIN B AND EPIMEDODOREANIN C FROM THE AERIAL PARTS OF EPIMEDIUM KOREANUM NAKAI

从朝鲜淫羊藿（ＥｐｅｉｍｅｄｉｕｍｋｏｒｅａｎｕｍＮａｄａｉ）地上部分中分离得到二个新黄酮成分：朝藿素Ｂ（ｅｐｉｍｅｄｏｋｏｒｅａｎｉｎＢ）（Ｉｘ）和朝藿素Ｃ（ｅｐｉｍｅｄｏｋｏｒｅａｎｉｎＣ）（ＸＶ），经光谱分析证明，朝藿素Ｂ（ＩＸ）的结构为５，７，３｀，４｀－ｔｅｔｒａｈｙｄｒｏｘｙｌ－８，５｀，－ｄｉｐｒｅｎｙｌｆｌａｖｏｎｅ；朝藿素ｃ（ｘｖ）的结构为５，７，３１｀，７｀－ｔｅｔｒａｈｙｄｒｏｘｙｌ－８－ｐｒｅｎｙｌ－２｛［２｀－（ｌ－ｈｙｄｒｏｘｙｌ－ｌ－ｍｅｔｈｙｌｅｔｈｙｌ）－２｀，３｀－ｄｉｈｙｄｒｏｂｅｎｚｏｆｕｒａｎ］－５｀－ｙｌ｝－ｃｈｒｏｍｏｎｅ．

Two new flavones were isolated ftom aerial parts of Epimedium koreanum Nakai, family Berberidaceae,On the basis of physicochemical properties and spectroscopic analysis theirstructures were elucidated as 5,7,3`,4`- tetrahydroxyl-8,5`-diprenylflavone(IX),7,3`,7`-tetrahydroxyl-8-prenyl -2{[2`-(1-hydroxyl-l-methylethyl)2`,3`-dihydrobenzofuran]-5`- yl}-chromone(XV).They are named epimedokoreanin B(IX)and epimedokoreanin C(XV)respectively.