The corresponding acetylated and free 2-O- and 4-O-glucosyl derivatives of dianhydrohexoses Ib - VIIb and Ic - VIIc have been obtained by the reactions of 2,3,4,6-tetra-O-acetyl-α-D-glucopyranosyl bromide (IX) with 1,6:3,4- and 1,6:2,3-dianhydro-β-D-hexopyranoses (Ia - VIIa). Structure of the products and the effects of glycosylation upon chemical shifts and conformations of the disaccharides prepared have been studied using 1H and 13C NMR spectra.
已获得了二糖醇异构体Ib-VIIb和Ic-VIIc的相应乙酰化和自由2-O-和4-O-葡萄糖基衍生物,通过2,3,4,6-四-O-乙酰基-α-D-葡萄糖吡喃糖溴化物(IX)与1,6:3,4-和1,6:2,3-二糖基-β-D-己糖吡喃糖(Ia-VIIa)的反应。利用1H和13C NMR谱研究了产物的结构以及糖基化对所制备二糖的化学位移和构象的影响。