Difructose dianhydrides from sucrose and fructo-oligosaccharides and their use as building blocks for the preparation of amphiphiles, liquid crystals, and polymers
作者:José Manuel García Fernández、Andrée Gadelle、Jacques Defaye
DOI:10.1016/0008-6215(94)00239-8
日期:1994.12
derivatives of 2. Reaction of chloromethyloxirane with 1 or 2 yielded hydrophilic polymers. The 6,6'-di-S-heptyl-6,6'-dithio derivative of 1 displayed liquid crystal properties. The 6,6'-dideoxy-6,6'-diiodosucrose precursor was prepared by the reaction of Garegg's iodine-imidazole-triphenylphosphine reagent with sucrose in N,N-dimethylformamide solution.
蔗糖和低聚果糖中的果糖基部分的选择性质子活化,在20摄氏度下用吡啶鎓聚(氟化氢)产生动力学产物α-D-果糖呋喃糖β-D-果糖呋喃糖1,2':2,1 '-二酐(1)或其热力学更稳定的异构体α-D-果糖呋喃糖β-D-果糖吡喃糖1,2':2,1'-二酐(2),具体取决于氟化氢与吡啶的比率。用6,6'-二氯-6,6'-二脱氧蔗糖或6,6'-二脱氧-6,6'-二碘蔗糖进行了类似的反应,只是使用了更高的HF比例,得到了相应的6-脱氧-6-卤代-α-D-果糖呋喃糖6'-脱氧-6'-卤代-β-D-果糖呋喃糖1,2':2,1'-二酐衍生物。在适当的亲核试剂作用下,两种6,6'-二卤化物均被转化,进入带有6,6'-二-S-庚基-6,6'-二硫代,6,6'-二叠氮基-6,6'-二脱氧和然后6,6'-二氨基-6,6的二果呋喃糖二酐衍生物-二脱氧官能团。还通过直接卤化制备2的6-氯-6-脱氧和6-脱氧-6-碘衍生物