Synthesis of heparinoligosaccharides and their interaction with eosinophil-derived neurotoxin
作者:Shang-Cheng Hung、Xin-An Lu、Jinq-Chyi Lee、Margaret Dah-Tsyr Chang、Shun-lung Fang、Tan-chi Fan、Medel Manuel L. Zulueta、Yong-Qing Zhong
DOI:10.1039/c1ob06415k
日期:——
A convenient route for the synthesis of heparin oligosaccharides involving regioselective protection of D-glucosamine and a concise preparation of rare L-ido sugars from diacetone α-D-glucose is described. Stereoselective coupling of a D-glucosamine-derived trichloroacetimidate with a 1,6-anhydro-β-L-idopyranosyl 4-alcohol gave the desired α-linked disaccharide, which was used as repeating unit for
合成肝素寡糖的简便方法涉及区域选择性保护 D-葡萄糖胺并从中精制稀有的L - ido糖双丙酮α- D-葡萄糖描述。D-葡糖胺衍生的三氯乙亚氨酸酯与1,6-脱水-β - L-偶氮吡喃糖基4-醇的立体选择性偶联产生所需的α-连接的二糖,其用作双链延长和终止的重复单元。使用D从还原端到非还原端逐步组装-葡糖胺衍生的单糖作为起始单元提供了具有不同链长的寡糖骨架。一系列官能团转化提供了具有3、5和7个糖单元的预期肝素寡糖。这些寡糖与嗜酸性粒细胞衍生的神经毒素(EDN),阳离子核糖核酸酶和人类嗜酸性粒细胞产生的介体的相互作用进行了进一步研究。结果表明,在5μgmL -1时,七糖具有足够强的干扰作用,以阻断EDN与Beas-2B细胞的结合。三糖和五糖在50μgmL -1浓度下具有中等抑制性能,但在10μgmL -1处未观察到抑制作用。IC 50三糖,五糖和七糖的值分别为69.4、47.2和0.225μgmL