A new and efficient three-step procedure for the synthesis of 1,6-anhydro-α-D-galactofuranose is described. The key step involves the formation of the galactofuranosyl iodide by treatment of per-O-TBS-D-Galf with TMSI, the selective 6-O-desilylation by an excess of TMSI, and the simultaneous nucleophilic attack of the 6-hydroxy group on the anomeric carbon, with the iodide as a good leaving group. This compound is a good precursor for building blocks for the construction of 1→6 linkages.
描述了一种新的高效三步合成1,6-脱水α-D-半乳糖的方法。关键步骤涉及通过使用TMSI处理per-O-TBS-D-Gal f,形成半乳糖基碘化物,通过过量的TMSI进行选择性的6-O-脱硅基化,同时伴随着6-羟基团对缩醛糖基的核攻击,以碘化物作为良好的离去基团。该化合物是构建1→6键的构建块的良好前体。