Simple Synthesis of 1,2‐Dideoxy‐2‐Vinyl Carbohydrates by Tin‐Free Radical Reactions of Xanthates
作者:Yasemin Mai‐Linde、Torsten Linker
DOI:10.1002/chem.202302118
日期:2024.1.2
Radical and non-toxic: C-Branched carbohydrates 3 are easily available from glycals 1 via xanthates 2. Key step is a radical reaction with triethylborane, which proceeds under mild conditions with high regioselectivity. Various side products have been isolated in pure form. They speak for a reversible ring-opening of the intermediary cyclopropylmethyl radicals, which is interesting for the mechanistic
自由基且无毒: C支链碳水化合物3很容易从糖醛1经由黄原酸盐2获得。关键步骤是与三乙基硼烷发生自由基反应,该反应在温和条件下进行,具有高区域选择性。各种副产物已以纯品形式分离出来。它们代表中间环丙基甲基自由基的可逆开环,这对于理解此类反应的机理很有趣。