Conversion of Glucosamine to Galactosamine and Allosamine Derivatives: Control of Inversions of Stereochemistry at C-3 and C-4
作者:Ross P. McGeary、Karen Wright、Istvan Toth
DOI:10.1021/jo010210+
日期:2001.7.1
of sodium benzoate with a series of trimesylates derived from glucosamine have been examined in an attempt to gain facile access to galactosamine analogues. Trimesylate 17, in which the amino group was protected as a phthalimide, underwent double displacement at positions 4 and 6 to give the dibenzoate 18 with the desired galactosamine configuration. In contrast, trimesylates 21 and 27, in which the
为了使人们容易地获得半乳糖胺类似物,已经研究了苯甲酸钠与一系列衍生自葡糖胺的偏苯三酸酯的反应。其中氨基被保护为邻苯二甲酰亚胺的三甲磺酸酯17,在4和6位进行了两次置换,得到具有所需半乳糖胺构型的二苯甲酸酯18。相反,其中氨基被保护为乙酰胺的均苯三甲酸酯21和27出乎意料地在位置3和6进行了两次置换,分别得到具有异源胺构型的产物22和28。