Alkynyl group attached on the C-1 position of pyranose ring was epimerized through dicobalt hexacarbonyl complex with trifluoromethanesulfonic acid. Three steps involving complexation, acidic transformation and decomplexation afforded overall epimerization. The driving force of this epimerization based on 1.3-diaxial interaction and 1,2-interaction.
吡喃糖六羰基配合物与
三氟甲磺酸通过
吡喃糖在
吡喃糖环的C-1位置连接炔基。涉及络合,酸性转化和分解的三个步骤提供了整体差向异构。这种差向异构的驱动力基于1.3-双轴相互作用和1,2-相互作用。