Enantiomerically Pure α,β-Unsaturated Five-Membered-Ring Aldehydes by Ring Contraction of Epoxyhexopyranosides
作者:Fritiof Pontén、Göran Magnusson
DOI:10.1021/jo970666k
日期:1997.11.1
single, enantiomerically pure, alpha,beta-unsaturated furanosidic aldehyde. Similar ring contraction of a C-propylglycosidic analog of one of the epoxyhexopyranosides gave a mixture of two diastereomeric aldehydes. This finding supports the previously suggested mechanism of the reaction and indicates that O-glycosidic epoxypyranosides also rearrange into two aldehydes, one of which is unstable.
一系列在6位上被不同取代的环氧己吡喃糖苷各自通过环收缩而转变成单个对映体纯的α,β-不饱和呋喃硅醛。环氧己吡喃糖苷之一的C-丙基糖苷类似物的类似的环收缩产生了两种非对映异构醛的混合物。该发现支持了先前提出的反应机理,并表明O-糖苷型环氧吡喃糖苷也重排成两个醛,其中之一是不稳定的。