Abstract

Two new glycosidic acids, calyhedic acids E (1a) and F (2a), were isolated from the glycosidic acid fraction afforded by alkaline hydrolysis of the crude resin glycoside fraction obtained from whole plants of Calystegia hederacea Wall. Compounds 1a and 2a were characterised as 11S-hydroxyhexadecanoic acid 11-O-β-D-glucopyranosyl-(1→6)-O-β-D-glucopyranosyl-(1→6)-O-β-D-glucopyranosyl-(1→3)-[O-α-L-rhamnopyranosyl-(1→2)]-O-β-D-glucopyranosyl-(1→2)-β-D-quinovopyranoside and an isomer of 1a, in which the 11S-hydroxyhexadecanoyl residue of 1a was replaced by a 12S-hydroxyhexadecanoyl residue, respectively, on the basis of spectroscopic data.

摘要

两个新的糖苷酸，calyhedic酸E（1A）和F（图2a），从通过从完整的植物中得到的粗树脂糖苷分数的碱性水解，得到酸糖苷级分中分离打碗hederacea墙。化合物1a和2a被表征为 11 S-羟基十六烷酸 11 - O -β-D-吡喃葡萄糖基-(1→6) -O -β-D-吡喃葡萄糖基-(1→6) -O -β-D-吡喃葡萄糖基- (1→3)-[ O -α-L-吡喃鼠李糖基-(1→2)]- O -β-D-吡喃葡萄糖基-(1→2)-β-D-吡喃喹啉苷和1a的异构体，其中11秒根据光谱数据，1a的-羟基十六酰基残基分别被12 S-羟基十六酰基残基取代。