Convenient synthesis of 4-thiolactose, 3,4-dithiolactose and related thiooligosaccharides and disulfides. Inhibitory activity of the glycomimetics against a β-galactosidase
作者:Verónica E. Manzano、María Laura Uhrig、Oscar Varela
DOI:10.1039/c2ob26388b
日期:——
The ring-opening reaction of sugar 3,4-epoxides by 2,3,4,6-tetra-O-acetyl-1-thio-β-D-galactopyranose (7) as a nucleophile led to (1 → 3)- and (1 → 4)-thiodisaccharides. High regio- and diastereoselectivities were achieved in the synthesis of the per-O-acetyl derivative of the β-D-Galp-S-(1 → 4)-4-thio-α-D-Glcp-O-iPr (10). Analogues of the 4-thiolactoside 10 have been prepared, with the β-D-Galp non-reducing
糖3,4-环氧化物通过2,3,4,6-四-O-乙酰基-1-硫基-β - D-吡喃半乳糖(7)作为亲核试剂的开环反应导致(1→3)-和(1→4)-硫代二糖。在β- D -Gal p-S-(1→4)-4-硫代-α - D -Glc p-O -iPr的全-O-乙酰基衍生物的合成中实现了很高的区域选择性和非对映选择性(10)。4 thiolactoside的类似物10已经制备,与β- d -Gal p非还原端小号-连接到d -Glc p,d-Gul p和D -Ido p。7对2-丙基3,6-二-O-乙酰基-3,4-表硫基-α- D-吡喃半乳糖苷(6)的C-4的类似区域选择性攻击导致2-丙基3,4-二硫代糖苷衍生物15。在该反应期间,15的游离3-SH基团进行氧化二聚或具有7的SH功能的氧化偶合,得到各自的二硫化物。使用β- D -Gal p或β- D -Gal f的三氯乙酰亚氨酸酯衍生物对15的巯