An efficient glycosylation of carboxylic acids 2a-p has been developed employing 2-deoxyglycosyl phosphorodithioates 1a-h as glycosyl donors and Ag+ salts as activators. In the case of aliphatic acids the method is highly β-stereoselective. Stereoselectivity of glycosylation of aromatic acids depends on their structure. The α/β ratio is temperature dependent. Hydroxy groups in α-hydroxycarboxylic acids are not affected by glycosylation under the reaction conditions used.
利用2-脱氧糖基
磷酸二
硫酯1a-h作为糖基供体和Ag+盐作为活化剂,已经开发出一种高效的
羧酸2a-p的糖基化方法。对于脂肪族酸,该方法具有高度的β-立体选择性。芳香族酸的糖基化立体选择性取决于其结构,α/β比例受温度影响。在所用的反应条件下,α-羟基
羧酸中的羟基不受糖基化的影响。