作者:Takashi Maeda、Masumi Kiyokawa、Kanji Tokuyama
DOI:10.1246/bcsj.42.492
日期:1969.2
The ethylidenation of L-sorbose (I) with acetaldehyde dimethylacetal in the presence of an acid was studied. When the reaction was interrupted at the initial stage, an equilibrium mixture of the two possible cyclic acetals, 1,2-O-(III) and 1,3-O-ethylidene-α-L-sorbopyranose (V), was obtained. When the reaction was allowed to proceed for longer periods of time, 1,3:4,6-di-O-ethylidene-β-L-sorbofuranose
研究了在酸存在下 L-山梨糖 (I) 与乙醛二甲基乙缩醛的亚乙基化。当反应在初始阶段中断时,得到两种可能的环状缩醛 1,2-O-(III) 和 1,3-O-亚乙基-α-L-山梨吡喃糖 (V) 的平衡混合物。当反应进行较长时间时,主要分离出1,3:4,6-二-O-亚乙基-β-L-山梨呋喃糖(IX);将其转化为两种非对映异构体 2,3:4,6-二-O-亚乙基-α-L-山梨呋喃糖(XV 和 XVIII)需要使用强酸性条件。I→(III\rightleftarrowsV)→IX→(XV+XVIII)的途径被初步提出用于I的亚乙基化。