所述的合成ø -连接的含有六糖β- d -Gal ˚F - (1→2)-β- d -Gal ˚F在克氏锥虫粘蛋白†
摘要:
六糖β- D -Gal p-(1→2)-[β- D -Gal p-(1→3)]-β- D -Gal p-(1→6)-[β- D -Gal f(1→2)-β- d -Gal ˚F(1→4)] - d -GlcNAc(1)是从一些菌株的粘蛋白释放作为醛糖醇通过还原性β-消除最大碳水化合物结构锥虫。末端β- D- Gal p单位是通过反唾液酸酶进行唾液酸化的位点,其将唾液酸从宿主转移至寄生虫。六糖1通过基于腈辅助糖基化的[3 + 3]聚合策略,使用三氯乙酰亚氨酸酯方法合成了SnO。所述β- d -Gal ˚F - (1→2)-β- d -Gal ˚F - d -GlcNAc合成子依次从还原端构造成的非还原端使用苄α- d -galactofuranoside作为起始原料内部Gal f单元。对这种新型前体的选择是在一个反应步骤中从半乳糖中获得的,从而可以在O-2处引入一个正交的参与的乙酰丙酰基。因此,Gal
所述的合成ø -连接的含有六糖β- d -Gal ˚F - (1→2)-β- d -Gal ˚F在克氏锥虫粘蛋白†
摘要:
六糖β- D -Gal p-(1→2)-[β- D -Gal p-(1→3)]-β- D -Gal p-(1→6)-[β- D -Gal f(1→2)-β- d -Gal ˚F(1→4)] - d -GlcNAc(1)是从一些菌株的粘蛋白释放作为醛糖醇通过还原性β-消除最大碳水化合物结构锥虫。末端β- D- Gal p单位是通过反唾液酸酶进行唾液酸化的位点,其将唾液酸从宿主转移至寄生虫。六糖1通过基于腈辅助糖基化的[3 + 3]聚合策略,使用三氯乙酰亚氨酸酯方法合成了SnO。所述β- d -Gal ˚F - (1→2)-β- d -Gal ˚F - d -GlcNAc合成子依次从还原端构造成的非还原端使用苄α- d -galactofuranoside作为起始原料内部Gal f单元。对这种新型前体的选择是在一个反应步骤中从半乳糖中获得的,从而可以在O-2处引入一个正交的参与的乙酰丙酰基。因此,Gal
Synthesis of the hexasaccharide from Trypanosoma cruzi mucins with the Galp(1 → 2)Galf unit constructed with a superarmed thiogalactopyranosyl donor
摘要:
Hexasaccharide beta-D-Galp-(1 -> 2)-[beta-D-Galp-(1 -> 3)]-beta-D-Galp-(1 -> 6)-[beta-D-Galp-(1 -> 2)-beta-D-Galf-(1 -> 4)]-D-GlcNAc (1) was found O-linked in mucins of Trypanosoma cruzi epimastigotes and metacyclic trypomatigotes. Studies on the biological pathways and functionalities of the mucin oligosaccharides are prompted in order to understand the interactions of these molecules with the insect host. Trisaccharide constituent beta-D-Galp-(1 -> 2)-beta-D-Galf-(1 -> 4)-D-GlcNAc was constructed from the reducing to the non-reducing end. We discuss the difficulties to introduce a Galp unit at the O-2 position of a partially protected galactofuranosyl unit which were overcome using an anchimerically superarmed donor. By this route and employing a [3 + 3] nitrilium convergent approach hexasaccharide 1 was synthesized in moderate yield.