Exploitation of Furanoid 5-Azido-3-C-Branched-Chain Sugars Towards Highly Functionalized Nitrogen-Containing Carbohydrate Derivatives
作者:Nuno M. Xavier、Yves Queneau、Amélia P. Rauter
DOI:10.1002/ejoc.201001119
日期:2011.2
The ability of easily accessed 1,2-0-protected 5-azido-3-C-(ethoxycarbonyl)methylenefuranoses to serve as precursors for the generation of imino sugar derivatives containing an α,β-unsaturated lactone or ketone functionality has been investigated. A key aspect was the propensity of the corresponding deprotected δ-amino α,β-unsaturated esters to undergo 5-aminofuranose/iminopyranose isomerization. Acid
已经研究了容易获得的 1,2-0-保护的 5-叠氮基-3-C-(乙氧基羰基) 亚甲基呋喃糖作为产生含有 α,β-不饱和内酯或酮官能团的亚氨基糖衍生物的前体的能力。一个关键方面是相应的脱保护 δ-氨基 α,β-不饱和酯倾向于进行 5-氨基呋喃糖/亚氨基吡喃糖异构化。δ-氨基 (Z)-α,β-不饱和酯的酸水解,然后用碱处理,导致由共轭系统诱导的亚氨基-糖稠合丁烯内酯中间体的重排产生含有丁烯内酯的 N-乙基甲酰胺。当在中性条件下进行扩环步骤时,得到 2-酮亚氨基糖,它很容易通过乙酰化转化为 1,2-二氢吡啶-3-酮。此外,