Solid-Phase Synthesis of a Branched Hexasaccharide Using a Highly Efficient Synthetic Strategy
作者:Fabien Roussel、Mohamed Takhi、Richard R. Schmidt
DOI:10.1021/jo016018p
日期:2001.12.1
The solid-phase synthesis of branched lacto-N-neohexaose derivative 1 occurring in human milk is described. The new building block of lactose 3 bearing the orthogonal temporary hydroxy protecting groups 9-fluorenylmethyloxycarbonyl (Fmoc) and levulinoyl (Lev) has been prepared. Its use, together with that of lactosamine donor 4, glucosamine donor 5, and O-galactosyl trichloroacetimidate 6, has enabled
描述了在人乳中发生的支链乳酸-N-新己糖衍生物1的固相合成。已经制备了带有正交的临时羟基保护基9-芴基甲氧基羰基(Fmoc)和乙酰丙酰基(Lev)的乳糖3的新结构单元。它的使用与乳糖胺供体4,葡糖胺供体5和O-半乳糖基三氯乙酰亚氨酸酯6的使用,使得能够按照两种不同方法以优异的总收率(43%,八步中每步90%)制备六糖22。这项工作的另一个关键特征是成功使用了新制备的酯型连接基2,该连接基具有与异头氧连接的苄基间隔基。该接头具有从聚合物载体上裂解后产生苄基异头部分的优点,