Synthesis of β-d-Galp-(1→3)-β-d-Galp-(1→6)-[β-d-Galf-(1→4)]-d-GlcNAc, a tetrasaccharide component of mucins of Trypanosoma cruzi
作者:Carola Gallo-Rodriguez、M.Agustina Gil-Libarona、Verónica M Mendoza、Rosa M de Lederkremer
DOI:10.1016/s0040-4020(02)01226-7
日期:2002.11
The synthesis of free β-d-Galp-(1→3)-β-d-Galp-(1→6)-[β-d-Galf-(1→4)]-d-GlcNAc and the corresponding alditol which has been previously isolated by reductive β-elimination of Trypanosoma cruzi glycoproteins are described. A convergent route was envisioned by condensing an acceptor derivative of β-d-Galf-(1→4)-d-GlcNAc with a donor derivative of β-d-Galp-(1→3)-d-Galp. The trichloroacetimidate method, as
游离β-d-Gal的合成p(1→3)-β-d-Gal的- p - (1→6) - [β-d-Gal的˚F - (1→4)] - d-GlcNAc的和描述了先前已经通过还原性β-消除克氏锥虫糖蛋白分离的相应的糖醇。会聚路径通过冷凝β-d-Gal的的受体衍生物设想˚F - (1→4)-D-GlcNAc的具有β-d-Gal的供体衍生物p - (1→3)-D-半乳糖p。三氯乙酰亚胺酸盐方法以及SnCl 4促进的缩合用于引入半乳糖呋喃糖基单元。另一方面,用糖基-醛糖内酯方法,然后用二异戊基硼烷还原内酯,再异构化为半乳糖吡喃糖构型,得到供体衍生物,其通过三氯乙酰亚氨酸酯方法缩合。此外,对于引入β-d-Gal的的合成子p - (1→3)-D-半乳糖˚F单元进行说明。