H-bond-mediated aglycone delivery (HAD) pathway. A new practical method for the stereoselective synthesis of β-glycosides of mannosamine is reported. The presence of the O-picoloyl group at the C-3 position of a mannosamine donor can provide high or complete stereocontrol. The method was also utilized for the synthesis of a biologically relevant trisaccharide related to the capsular polysaccharide of Streptococcus
位于远端的O-
吡啶甲酰基保护基团可以通过 H 键介导的糖苷配基传递 (HAD) 途径影响糖基化的立体选择性。报道了一种立体选择性合成
甘露糖胺β-糖苷的实用新方法。在
甘露糖胺供体的 C-3 位置存在O-
吡啶甲酰基可以提供高度或完全的立体控制。该方法还用于合成与肺炎链球菌血清型4的荚膜
多糖相关的
生物学相关三糖。本文还报道了一种用配备有3- O-苯甲酰基的
甘露糖胺供体实现完全α-
甘露糖立体选择性的方法。