A general method for the synthesis of oligosaccharides consisting of α-(1→2)- and α-(1→3)-linked rhamnan backbones and GlcNAc side chains
作者:Jianjun Zhang、Fanzuo Kong
DOI:10.1016/s0040-4020(03)00075-9
日期:2003.2
and 3-O-acetyl-2,4-di-O-benzoyl-α-l-rhamnopyranosyl trichloroacetimidate, which were obtained by highly regioselective 3-O-acylations, were used as the key synthons to obtain the required α-(1→2)- and α-(1→3)-linked rhamnoocta saccharide acceptors with 33- and 37-free hydroxyl groups. Therefore, several disaccharides were synthesized, from which tetrasaccharides and hexasaccharides were then synthesized
已经开发了用于合成由具有GlcNAc侧链的(1→2)-和(1→3)-连接的鼠李糖寡糖组成的寡糖的一般方法。例如,在植物致病性细菌丁香假单胞菌pv的脂多糖的O多糖部分中的两个十糖的高效且收敛的合成。获得了ribicola NCPPB 1010。这两个十糖分别由O多糖重复单元I + II和II + I组成。烯丙基3- ø -乙酰基-4- ö苯甲酰基α-L-吡喃鼠李糖苷,烯丙基2- ø -苯甲酰基-3- ø -氯乙酰-α-L-吡喃鼠李糖苷,2,4-二- ö苯甲酰基-3- ø -氯乙酰-α-L-吡喃鼠李糖三氯乙酰亚胺酯,和3- ö -乙酰基-2,4-二- ö苯甲酰基α-L-吡喃鼠李糖三氯乙酰亚胺酯,这是由高度选择性3-O-获得酰化用作关键合成子,以得到所需的具有3 3-和3 7-游离羟基的α-(1→2)-和α-(1→3)连接的鼠李糖单糖受体。因此,合成了几种二糖,然后由它们合成了四糖和六糖。六糖供