Flow synthesis of annulated 5-aryl-substituted pyridines by tandem intramolecular inverse-electron-demand hetero-/retro-Diels–Alder reaction
作者:Rainer E. Martin、Mario Lenz、Thibaut Alzieu、Johannes D. Aebi、Liliane Forzy
DOI:10.1016/j.tetlet.2013.09.069
日期:2013.12
5-Aryl-substituted annulatedpyridines can be accessed directly from the corresponding acetylene substituted pyrimidines through an intramolecularinverse-electron-demand hetero-/retro-Diels–Alder (ihDA/rDA) reaction cascade carried out in continuousflow. Exploiting this new process, a series of cycloalka[c]pyridines that represent useful building blocks for medicinal chemistry were prepared in good
可以通过连续流动进行的分子内逆电子需求杂-/反-Diels-Alder(ih DA / r DA)反应级联,从相应的乙炔基取代的嘧啶中直接获得5-芳基取代的环已吡啶。利用这种新工艺,一系列cycloalka的[ C ^ ]吡啶表示为药物化学有用积木良好制备用短处理时间优异的产率(<45分钟)。重要的是,利用使流体中的溶剂过热的能力允许用甲苯代替通常使用的高沸点溶剂(例如,硝基苯或氯苯)。