Stereoselective synthesis of oxiranes as a source of isoserine analogues using d-glucosamine and d-glucose derivatives as chiral templates
作者:José M. Vega-Pérez、Margarita Vega、Eugenia Blanco、Fernando Iglesias-Guerra
DOI:10.1016/j.tetasy.2004.09.034
日期:2004.11
The synthesis of alkyl (R)-4,6-O-(2,3-epoxypropylidene) hexopyranoside derivatives from N-acetyl-d-glucosamine and d-glucose is described. The reaction of epoxidation with m-CPBA of the corresponding alkenylidene derivatives took place with different stereoselectivities depending upon the substitution of the unsaturated system, the protecting groups of the hydroxyl group at carbon three of the sugar
描述了由N-乙酰基-d-葡糖胺和d-葡萄糖合成烷基(R)-4,6- O-(2,3-环氧丙叉基)己吡喃糖苷衍生物。相应的烯基亚烷基衍生物与m -CPBA的环氧化反应以不同的立体选择性进行,这取决于不饱和体系的取代,糖部分碳三处羟基的保护基团及其构型。这些环氧乙烷与氮亲核试剂的开环反应得到苯基异丝氨酸前体。