4-tribenzyl-1-thio-d-glucopyranoside, as a mixture of anomers, was employed for the stereoselective synthesis of the potassium salt of (2R)-2-O-alpha-d-glucopyranosyl-(1-->6)-alpha-d-glucopyranosyl-2,3-dihydroxypropa noic acid (alpha-d-glucosyl-(1-->6)-alpha-d-glucosyl-(1-->2)-d-glyceric acid, GGG), a recently isolated compatible solute. The alpha-anomer was by far the major product of both glycosylation reactions using
作为异构体的混合物,将乙基6-O-乙酰基-2,3,4-三苄基-1-
硫代-d-
吡喃
葡萄糖苷用于(2R)-2-O-α-
钾盐的立体选择性合成d-
吡喃
葡萄糖基-(1-> 6)-α-d-
吡喃
葡萄糖基-2,3-二羟基
丙酸(α-d-
葡萄糖基-(1-> 6)-alpha-d-
葡萄糖基-(1-- > 2)-d-
甘油酸(GGG),最近分离出的相容溶质。到目前为止,使用NIS / TfOH作为活化剂,α-端基异构体是两个糖基化反应的主要产物。