作者:Stefan Oscarson、Pär Svahnberg
DOI:10.1039/b009670a
日期:——
with two glucuronate thioglycoside donors differently substituted in the 4-position, O-methyl and O-mesyl, respectively, to give trisaccharides. DMTST as promoter in diethyl ether gives exclusively the α-linked products in high yield. Treatment of the 4″-O-mesyl trisaccharide with DBU then gives the α,β-unsaturated uronic acid derivative. The protection pattern introduced in the acceptor allows continued
含两个糖醛酸 三糖,(4-脱氧β-大号-苏式-己-4- enopyranosyluronic酸) -和(4- ö甲基α- d -gluropyranosyluronic酸) - (1→2)-β- d -xylopyranosyl-(1 →4)-从纸浆中合成酶水解产物中发现的D-木吡喃糖。常见的二木糖苷2'-OH受体对甲氧基苯基[3,4- O-(2',3'-二甲氧基丁烷-2',3'-二基)-β- D-木吡喃糖基]-(1→4)-构建2,3-二-O-苯甲酰基-β - D-吡喃吡喃糖苷,并与在4-位不同取代的两个葡萄糖醛酸硫代糖苷供体,O-甲基和O-mesyl分别给出 三糖。DMTST作为中的启动子乙醚仅以高收率得到α-连接产物。然后用DBU处理4″ -O-甲磺酰基三糖,得到不饱和的α,β糖醛酸衍生物。受体中引入的保护模式可以继续合成更大的寡糖。除去丁二酮缩醛产生3',4'-受体,并且对甲氧基苯基