A highly efficient palladium-catalyzed cascade annulation of pyrazolones and aryl iodides to access various benzo[c]cinnoline derivatives has been achieved at 80 °C. A pyridine-type ligand could improve the reaction efficiency under current reaction conditions, giving a higher product yield up to 94%. This novel approach provided a one-pot dual C–H activation strategy with good functional group tolerance
在80°C时,已经实现了高效的钯催化吡唑啉酮和芳基碘的级联环化反应,以得到各种苯并[ c ]肉桂酸衍生物。吡啶类配体可提高当前反应条件下的反应效率,最高收率可达94%。这种新颖的方法提供了具有良好官能团耐受性的一锅双C–H活化策略,例如卤素,甲氧基,硝基,酯,苯酚等。该产物可以很容易地转化为cinnoline衍生物。
AL-ASHMAWI M. I.; GHONEIM K. M.; KHALIFA M., PHARMAZIE, 1980, 35, NO 10, 591-593