Isothiocyanates and cyclic thiocarbamates of α, α′-trehalose, sucrose, and cyclomaltooligosaccharides
作者:JoséManuel García Fernández、Carmen Ortiz Mellet、JoséLuis Jiménez Blanco、José Fuentes Mota、Andrée Gadelle、Annie Coste-Sarguet、Jacques Defaye
DOI:10.1016/0008-6215(94)00312-4
日期:1995.3
amino sugars with thiophosgene. In the absence of base, all isothiocyanates were stable and could be stored and acetylated without decomposition. In the presence of triethylamine, 6,6'-dideoxy-6,6'-diisothiocyanato-alpha,alpha'-trehalose underwent intramolecular cyclisation involving HO-4 to give the corresponding bis(cyclic thiocarbamate). The product of cyclisation at a single glucopyranosyl unit
6,6'-Dideoxy-6,6'-diisothiocyanato-alpha,alpha'-海藻糖(4),6-deoxy-6-isothiocyanato-alpha-D-果糖呋喃糖β-D-果糖吡喃糖1,2':2 ,1'-二酐(11),6,6'-二脱氧-6,6'-二异硫氰酸根合蔗糖(16)和全(6-脱氧-6-异硫氰酸根合)-环麦芽六糖(23),-环麦芽庚糖(27)和通过使相应的氨基糖与硫光气反应以高收率制备β-环麦芽八糖(31)。在没有碱的情况下,所有异硫氰酸酯都是稳定的,可以储存和乙酰化而不会分解。在三乙胺的存在下,将涉及HO-4的6,6'-二脱氧-6,6'-二异硫氰基-α,α'-海藻糖进行分子内环化反应,得到相应的双(环状硫代氨基甲酸酯)。在上述二异硫氰酸酯与混合的(H +,HO-)离子交换树脂的处理中,获得了在单个吡喃葡萄糖基单元上的环化产物。在相同的反应条件下,6,6'-二脱氧-6