A novel, efficient glycosylating reagent, R 3,4-O-isopropylidene-2-O-(4-methoxybenzyl)-1-thio-.beta. -L-fucopyranoside wherein R is a lower alkyl or lower alkenyl of 1 to 8 carbons such as methyl or pentenyl, is described. This novel reagent provides for the facile synthesis of linear and other .alpha.-L-fucosyl oligosaccharides. In addition, a method for the preparation of 2'-O-.alpha.-L-fucopyranosyl-lactose, which comprises reacting the abovementioned glycosylating reagent with solvated 4-O-(6-O-acetyl-3,4-O-isopropylidene-.beta.-D-galactopyranosyl)-2,3,5,6-di -O-isopropylidene-D-glucose, dimethyl acetal, a tetrabutylammonium halide and a catalyst and then de-O-acetylating the resulting reaction product with sodium methoxide methanol, is also disclosed.
一种新颖、高效的糖基化试剂,R 3,4-O-异丙基亚甲基-2-O-(4-甲氧基苄基)-1-
硫代-β-
L-岩藻糖苷,其中R是1到8个碳原子的较低烷基或较低烯基,如甲基或
戊烯基。这种新颖试剂可便捷合成线性和其他α-
L-岩藻糖寡糖。此外,还公开了一种制备2'-O-α-
L-岩藻糖基-
乳糖的方法,包括将上述糖基化试剂与溶解的4-O-(6-O-乙酰-3,4-O-异丙基-β-
D-半乳糖苷)-2,3,5,6-二-异丙基-
D-葡萄糖,二甲基
缩醛,四丁基
铵卤化物和催化剂反应,然后用
甲醇甲酸钠去醋酰化产物。