Calysolins I–IV, Resin Glycosides from Calystegia soldanella
作者:Ayako Takigawa、Haruka Muto、Kiyotaka Kabata、Masafumi Okawa、Junei Kinjo、Hitoshi Yoshimitsu、Toshihiro Nohara、Masateru Ono
DOI:10.1021/np2006378
日期:2011.11.28
Four new resin glycosides having intramolecular cyclic ester structures (jalapins), named calysolins I-IV (1-4), were isolated from the methanol extract of leaves, stems, and roots of Calystegia soldanella, along with one known jalapin (5) derivative. The structures of 1-4 were determined on the basis of spectroscopic data and chemical evidence. They fall into two types, one having a 22-membered ring (1 and 4) and the other with a 27-membered ring (2 and 3). The sugar moieties of 1-4 were partially acylated by some organic acids. Compound 4 is the first example of a hexaglycoside of jalapin.
Identification and Characterization of Component Organic and Glycosidic Acids of Crude Resin Glycoside Fraction from Calystegia soldanella
作者:Ayako Takigawa、Hiroaki Setoguchi、Masafumi Okawa、Junei Kinjo、Hiroyuki Miyashita、Kazumi Yokomizo、Hitoshi Yoshimitsu、Toshihiro Nohara、Masateru Ono
DOI:10.1248/cpb.59.1163
日期:——
Alkaline hydrolysis of the crude resin glycoside fraction of the leaves, stems, and roots of Calystegia soldanella ROEM. et SCHULT. (Convolvulaceae) gave four new glycosidic acids, named calysolic acids A, B, C, and D, along with one known glycosidic acid, soldanellic acid B, and three organic acids, 2S-methylbutyric, tiglic, and 2S,3S-nilic acids. The structures of the new glycosidic acids were characterized on the basis of spectroscopic data and chemical evidence.