Two Straightforward Strategies for the Synthesis of Thiodisaccharides with a Furanose Unit as the Nonreducing End
作者:Evangelina Repetto、Carla Marino、M. Laura Uhrig、Oscar Varela
DOI:10.1002/ejoc.200700874
日期:2008.1
Thiodisaccharides having a 1-thiopentofuranose nonreducing end were synthesized by two routes starting from per-O-acylaldofuranoses with arabino, ribo, and xylo configurations. These glycosyl donors were converted into S-glycosyl isothiourea derivatives as precursors of 1-thiofuranose units, which were generated in situ and trapped by a sugar enone to produce, by Michael addition, the thioglycosidic
具有 1-硫代戊呋喃糖非还原性末端的硫代二糖是通过两种途径合成的,从具有阿拉伯、核糖和木糖构型的 per-O-酰基醛基呋喃糖开始。这些糖基供体被转化为 S-糖基异硫脲衍生物作为 1-硫代呋喃糖单元的前体,其原位生成并被糖烯酮捕获,通过迈克尔加成产生硫糖苷键。或者,MoO2Cl2 促进的 6-硫糖衍生物的硫醇基团由过氧酰基呋喃糖进行糖基化,产生具有专属 1,2-反式非对映控制的硫二糖。 (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany , 2008)