Convenient construction of a variety of glycosidic linkages using a universal glucosyl donor
作者:Ken-ichi Sato、Shoji Akai、Koudai Sakai、Masaru Kojima、Hideshige Murakami、Tetsuya Idoji
DOI:10.1016/j.tetlet.2005.08.109
日期:2005.10
The donor 8 undergoes glycosidation with a primary carbohydrate alcohol 7 to give disaccharide 9 having a 1,2-cis-α-glycosidic linkage in 90% yield. The construction of the corresponding 1,2-trans-α-glycosidic linkage was performed in 68% yield (three steps) from 9. A similar glycosidation of the 2-O-(N-phenylcarbamoyl)-glucosyl donor 6 derived from 8 with 7 gave disaccharide 11 having a 1,2-trans-β-glycosidic
这封信涉及使用通用的葡萄糖基供体构建糖苷键的四种类型(顺式-α,反式-α,顺式-β和反式-β)的概念。由d-葡萄糖以36%的产率合成选择性保护的通用葡萄糖基供体8(八步)。供体8用伯糖醇7进行糖基化,以90%的产率得到具有1,2-顺式-α-糖苷键的二糖9。相应的1,2-反式-α-糖苷键的构建以68%的收率(三个步骤)从9进行。由8衍生的2- O-(N-苯基氨基甲酰基)-葡萄糖基供体6与7的类似糖苷化以75%的产率得到具有1,2-反式-β-糖苷键的二糖11。从11开始,相应的1,2-顺式-β-连接的构建以53%的产率(三个步骤)进行。