Pd-catalyzed annulation of imidazo[1,2-<i>a</i>]pyridines with coumarins and indoles: synthesis of benzofuran and indole fused heterocycles
作者:Rashmi Semwal、Gaurav Badhani、Subbarayappa Adimurthy
DOI:10.1039/d1cc06803b
日期:——
Palladium-catalyzed annulation of imidazo[1,2-a]pyridines with coumarins provided benzofuran fused transannulated products in good to excellent yields via a decarbonylative approach, while imidazo[1,2-a]pyridines with N-methyl indoles in the presence of palladium and base yielded conjugated imidazopyridine fused indole derivatives. Additional experiments revealed that the presence of the phenyl ring
钯催化的咪唑并[1,2- a ]吡啶与香豆素的环化反应通过脱羰方法提供了苯并呋喃稠合的环环化产物,而咪唑并[1,2- a ]吡啶与N-甲基吲哚在钯和碱产生共轭咪唑并吡啶稠合吲哚衍生物。进一步的实验表明,在咪唑并[1,2- a的 C-2 位存在苯环]吡啶对环化比烷基更重要。两种转变都遵循 Pd 催化的双 C-H 键活化的离子机制。所有的环状产品都显示出高荧光特性,并评估了它们的光物理特性。