Tetrahydroxanthones from Mongolian medicinal plant Gentianella amarella ssp. acuta
作者:Shuangxin Lu、Naonobu Tanaka、Kazuyoshi Kawazoe、Kotaro Murakami、Davaadagva Damdinjav、Enkhjargal Dorjbal、Yoshiki Kashiwada
DOI:10.1007/s11418-016-1015-z
日期:2016.10
Two tetrahydroxanthones, 1,3,5S,8S-tetrahydroxy-5,6,7,8-tetrahydroxanthone (1) and 1,3,5R,8S-tetrahydroxy-5,6,7,8-tetrahydroxanthone (2), and six new tetrahydroxanthone glycosides, amarellins A–F (3–8), were isolated from the aerial parts of a Mongolian medicinal plant Gentianella amarella ssp. acuta (Gentianaceae). The structures of 1–8 were elucidated on the basis of spectroscopic analysis, chemical conversion, and ECD calculation. Amarellins A–C (3–5) were assigned as 8-O-β-d-glucoside, 8-O-β-d-xyloside, and 1-O-β-d-glucoside of 1, respectively, while amarellins D–F (6–8) were elucidated to be 8-O-β-d-xyloside, 1-O-β-d-glucoside, and 3-O-β-d-glucoside of 2, respectively.
从蒙古族药用植物龙胆(Gentianella amarella ssp. acuta,龙胆科)的气生部分分离出两种四氢黄酮--1,3,5S,8S-四羟基-5,6,7,8-四氢黄酮(1)和1,3,5R,8S-四羟基-5,6,7,8-四氢黄酮(2),以及六种新的四氢黄酮苷--龙胆素A-F(3-8)。通过光谱分析、化学转化和 ECD 计算,阐明了 1-8 种物质的结构。其中,龙胆苷 A-C(3-5)分别为 1 的 8-O-β-d-葡萄糖苷、8-O-β-d-木糖苷和 1-O-β-d-葡萄糖苷;龙胆苷 D-F(6-8)分别为 2 的 8-O-β-d-木糖苷、1-O-β-d-葡萄糖苷和 3-O-β-d-葡萄糖苷。