Prolinamido-glycosides, water-compatible organocatalysts, are capable of catalyzing the stereoselective aldol reaction in aqueous media. The aldol reaction of 2,2-dimethyl-1,3-dioxan-5-one with aldehydo sugars in the isopropylidene form gave ketoses stereoselectively. The stereochemistry of these aldol reactions has been investigated in terms of the influence of conformational effects, and the results demonstrate
脯
氨酰胺糖苷是一种与
水相容的有机
催化剂,能够在
水性介质中催化立体选择性羟醛反应。
2,2-二甲基-1,3-二恶烷-5-酮与异亚丙基形式的醛糖的醛醇反应立体选择性地产生
酮糖。已经根据构象效应的影响研究了这些羟醛反应的立体
化学,结果表明
催化剂的构型和底物的构象是反应立体
化学结果的决定性因素。d-阿洛
酮糖和d-
塔格糖分别从2,3-O-异亚丙基-d-
甘油醛中选择性地获得。同样,从 2,3:4,5-二-O-异亚丙基-醛-d-
阿拉伯糖获得d-
甘油-d-
葡萄糖辛
酮糖,其结构由X-射线晶体学确定。