Components of Ether-Insoluble Resin Glycoside (Rhamnoconvolvulin) from Rhizoma Jalapae Braziliensis
作者:Masateru Ono、Hiroko Nishioka、Tadashi Fukushima、Hiroko Kunimatsu、Aiko Mine、Hideo Kubo、Kazumoto Miyahara
DOI:10.1248/cpb.57.262
日期:——
Alkaline hydrolysis of the ether-insoluble resin glycoside (convolvulin) fraction of the roots of Ipomoea operculata (GOMES) MART. (Convolvulaceae) afforded a glycosidic acid named operculinic acid H along with isovaleric, tiglic, and exogonic (3,6:6,9-diepoxydecanoic) acids. Operculinic acid H was characterized to be 3S,12S-dihydroxyhexadecanoic acid 12-O-β-D-glucopyranosyl-(1→3)-O-α-L-rhamnopyranosyl-(1→2)-[O-β-D-glucopyranosyl-(1→3)]-O-β-D-glucopyranosyl-(1→2)-[O-α-L-rhamnopyranosyl-(1→6)]-O-β-D-glucopyranoside on the basis of spectroscopic data and chemical evidence. The absolute configuration of exogonic acid determined from the α-methoxy-α-trifluoromethylphenylacetic acid esters of the hydrogenolysis products revealed that exogonic acid exists as a mixture (ca. 1 : 1) of two epimers, (3S,6S,9R)- and (3S,6R,9R)-diepoxydecanoic acids.
对厣苕子(GOMES)MART(旋花科)根中的醚不溶性树脂苷(convolvulin)部分进行碱性水解,得到了名为厣苕子酸 H 的苷酸,以及异戊酸、惕格酸和外庚酸(3,6:6,9-diepoxyd)。(旋花科)的根中提取出一种糖苷酸,命名为 Operculinic 酸 H 以及异戊酸、tiglic 酸和外庚酸(3,6:6,9-二环氧癸酸)。operculinic acid H 的特征是 3S、12S-二羟基十六烷酸 12-O-β-<小>D小>-吡喃葡萄糖基-(1→3)-O-α-<小>L小>-吡喃鼠李糖基-(1→2)-[O-β-<小>D小>-吡喃葡萄糖基-(1→3)]-O-β-D-吡喃葡萄糖基-(1→2)-[O-α-L-吡喃鼠李糖基-(1→6)]-O-β-D-吡喃葡萄糖苷的光谱数据和化学证据。根据氢解产物的α-甲氧基-α-三氟甲基苯乙酸酯测定的外果苷酸的绝对构型显示,外果苷酸以(3S,6S,9R)-和(3S,6R,9R)-二环氧癸酸两种表聚体的混合物(约 1 : 1)形式存在。