A general stereodivergent strategy for the preparation of carbasugars. Syntheses of 5a-carba-α-d-glucose, α-d-galactose, and β-l-gulose pentaacetates from d-mannose
作者:Ana M. Gómez、Eduardo Moreno、Serafı́n Valverde、J.Cristóbal López
DOI:10.1016/s0040-4039(02)01121-8
日期:2002.8
A stereodivergent approach to 5a-carba-d- and l-pyranoses has been applied to the preparation of 5a-carba-α-d-gluco-, 5a-carba-α-d-galacto-, and 5a-carba-β-l-gulopyranose pentaacetates. The strategy, by which a single precursor can be transformed into three different carbasugars, features a stereoselective reduction followed by deoxygenation of a key polyoxygenated methylcyclohexanone intermediate
5a-氨基甲酸酯-d-和1-吡喃糖的立体发散方法已用于制备5a-氨基甲酸酯-α-d-葡萄糖,5a-氨基甲酸酯-α-d-半乳糖和5a-氨基甲酸酯-β-左旋吡喃葡萄糖五乙酸盐。该策略可将单个前体转化为三个不同的Carbasugars,其特征是立体选择性还原,然后对关键的多氧化甲基环己酮中间体进行脱氧。后者可容易地通过d-甘露糖衍生物的6- ex - dig自由基环化获得。