Stereoselective Synthesis of Ketoses by Aldol Reaction Using Water-Compatible Prolinamide Catalysts in Aqueous Media
作者:Tomoya Machinami、Daisuke Miura、Takashi Fujimoto、Ayumi Tsutsui
DOI:10.1055/s-0033-1339197
日期:——
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。