Prearranged Glycosides, 4!. Synthesisvia Prearranged Glycosides of a Tetrasaccharide Fragment Related to the Capsular Polysaccharide ofStreptococcus pneumoniae Type 27
作者:Gunter Schüle、Thomas Ziegler
DOI:10.1002/jlac.199619961016
日期:1996.10
The blockwise synthesis of the pyruvated tetrasaccharide 4,6-(S)-pyruvic-acetal-β-d-GlcNAcp-(13)-α-d-Galp-(14)-β-l-Rhap-(14)-β-d-Glcp-O(CH2)5NH2 (32), related to the repeating unit of the capsular polysaccharide of Streptoccus pneumoniae type 27, by coupling of the suitably protected disaccharide blocks 4,6(S)-pyruvic-acetal-β-d-GlcNAcp-(13)-α-d-Galp-trichloroacetimidate (13) and β-l-Rhap-(14)-β-d-Glcp-O(CH2)5NHZ
所述pyruvated四糖的合成嵌段4,6-(小号)-pyruvic缩醛-β-d-GlcNAc的p - (13)-α-d-Gal的p - (14)-β-1-鼠李p - (14 )-β-d-GLC p -O(CH 2)5 NH 2(32),有关的荚膜多糖的重复单元Streptoccus肺炎,由适当保护的二糖块4,6的耦合(类型27小号) -pyruvic缩醛-β-d-GlcNAc的p - (13)-α-d-Gal的p -trichloroacetimidate(13)和β-L-鼠李糖p - (14)-β-d-GLC p -O(CH 2)描述了5 NHZ(29β)。后者的二糖受体是通过预先排列的糖苷,通过被保护的5-氨基戊基β-d-吡喃葡萄糖苷的分子内糖基化而制备的,所述5-氨基戊基β-d-吡喃葡萄糖苷通过在乙基的1-硫代-α-1-鼠李糖吡喃糖苷的C-3至C-2处的琥珀酰桥连接。研究了偶联的异