Syntheses of amphiphilic glycosylamides from glycosyl azides without transient reduction to glycosylamines
作者:Paul Boullanger、Valérie Maunier、Dominique Lafont
DOI:10.1016/s0008-6215(99)00284-0
日期:2000.2
Protected glycosyl azides react with acyl chlorides in the presence of triphenylphosphine to afford glycosylamides in high yields, at room temperature. Starting from the beta-glycosyl azides, the reaction is highly stereoselective and occurs with retention of configuration, whereas the alpha-azido anomers display a lower stereoselectivity giving rise to alpha/beta mixtures of glycosylamides. The reaction
在三苯基膦的存在下,保护的糖基叠氮化物在室温下与酰氯反应,以高收率提供糖基酰胺。从β-糖基叠氮化物开始,该反应是高度立体选择性的,并且保持构型发生,而α-叠氮基端基异构体显示出较低的立体选择性,从而产生糖基酰胺的α/β混合物。将反应物应用于几种单糖叠氮化物和具有各种酰基氯的乳糖酰叠氮化物;已证明其通常用于制备1,2-反式β-糖基酰胺。