Selective α-d-glucosylation of methyl 4,6-O-benzylidene-α- and β-d-glucopyranosides with 2,3,4,6-tetra-O-benzyl-α-d-glucopyranosyl bromide under catalysis by halide ion
N.m.r. and conformational studies of the methyl glycosides of some 1,2- and 1,3-linked disaccharides
作者:Per-Erik Jansson、Lennart Kenne、Elke Schweda
DOI:10.1039/p19880002729
日期:——
1 H and 13C N.m.r.studies and conformational analysis have been performed on the methyl glycosides of ten 1,2- and 1,3-linkeddisaccharides in which the glycosidic linkages have different stereochemical surroundings. Conformational analysis, using the HSEA-approach, indicates a number of protonoxygen and proton–proton interactions, resulting, inter alia, in downfield and upfield shifts of anomeric
1 H和13 C Nmr研究和构象分析已对十个1,2-和1,3-连接的二糖的甲基糖苷进行了研究,其中糖苷键具有不同的立体化学环境。构象分析,使用HSEA的方法中,表示数字protonoxygen和质子-质子相互作用,所得的尤其,在异头质子信号的前冲和高场位移,分别。获得的13 C nmr糖基化位移已用于模拟1,3-连接的α-和β- D-葡聚糖的光谱。