Stereoselective epoxidation of alkenylidene acetals derived from carbohydrates with d-allo, d-altro, d-galacto, d-gluco and d-xylo configurations
作者:José M. Vega-Pérez、Margarita Vega、Eugenia Blanco、Fernando Iglesias-Guerra
DOI:10.1016/j.tetasy.2007.07.015
日期:2007.8
The synthesis of 2,3-epoxypropylidene acetals of sugar derivatives from N-acetyl-2-amino-2-deoxy-d-allopyranose, d-altropyranose, d-galactopyranose, N-acetyl-d-glucosamine, d-glucofuranose and d-xylofuranose is described. The epoxidation with m-CPBA of the corresponding alkenylidene derivatives took place with different stereoselectivities depending upon the sugar configuration, the protecting group
由N-乙酰基-2-氨基-2-脱氧-d-吡喃果糖,d-altropyranose,d-吡喃半乳糖,N-乙酰基-d-葡糖胺,d-葡萄糖呋喃糖和d合成糖衍生物的2,3-环氧亚丙基缩醛描述了-木呋喃糖。相应的烯基亚烷基衍生物用m -CPBA环氧化以不同的立体选择性进行,这取决于糖的构型,糖的羟基的保护基团和不饱和系统的取代。通过氢解对这些肟酮的开环反应进行分析,从而可以确定它们在新的立体异构中心的构型。