Synthesis of Furfural Sulfides and 4‐Alkylthiopyridines <i>via</i> Heterocyclization of α‐Acyl Ketene Dithioacetals
作者:Xiaoxuan Zhang、Jian Chang、Chong Chen、Qianqian Zhai、Shengnan Li、Xiaoning Song
DOI:10.1002/adsc.202300574
日期:2023.11.7
Herein, we devised a synthetic approach for skeletally diversified furfuryl sulfides and 4-alkylthiopyridines involving the heterocyclization of flexible α-acyl ketene dithioacetals, enabled by cooperative Pd/Cu catalysis. The overall transformation was initiated by acyl-directed desulfurative Sonogashira coupling, which was proposed as the key step in surmounting the competitive carbothiolation pathway
在此,我们设计了一种骨架多样化的糠基硫醚和4-烷硫基吡啶的合成方法,涉及柔性α-酰基烯酮二硫缩醛的杂环化,通过协同Pd/Cu催化实现。整体转化是由酰基定向脱硫 Sonogashira 偶联引发的,这被认为是克服竞争性硫醇化途径的关键步骤。该步骤之后是 S-或 N-亲核试剂的 1,6-加成和分子内环化。值得注意的是,这两种不同的成环反应具有易于获得的起始原料、多个化学键的选择性断裂和重组、广泛的官能团耐受性、具有高区域和化学选择性的药理学意义的杂环产物以及高原子经济性的特点。