Starfish saponins. Part 5. Structure of sepositoside A, a novel steroidal cyclic glycoside from the starfish Echinaster sepositus
作者:Francesco De Simone、Antonio Dini、Estea Finamore、Luigi Minale、Cosimo Pizza、Raffaele Riccio、Franco Zollo
DOI:10.1039/p19810001855
日期:——
The toxic major saponinfrom the starfish Echinaster sepositus, has been completely characterized. The structure is unique having as it does both a Δ7,3β,6β-dioxygenated-23-oxosteroidal moiety and a sugar moiety [β-D-glucopyranosyl-(1→2)-β-D-galactopyranosyl-(1→2)-β-D-glucuronopyranosyl] which bridges the C-3 and C-6 atoms of the steroid. The 3β-hydroxy-group of the steroid forms an O-acetal linkage
海星Echinaster sepositus的有毒主要皂苷已被完全鉴定。该结构是具有独特因为它既有Δ 7,3β,6β二氧化-23- oxosteroidal部分和糖部分[β- d -glucopyranosyl-(1→2)-β- d -galactopyranosyl-(1→2 )-β- D-葡糖醛酸吡喃糖基],它连接了类固醇的C-3和C-6原子。类固醇的3β-羟基与葡萄糖醛酸酯单元形成O-缩醛键,而吡喃葡萄糖基单元的HO-C(6‴)与糖苷配基的C-6连接,形成6β - O-醚基连锁。