AbstractA substrate‐induced synthesis of coumarin‐fused quinolinones is achieved from 4‐(phenylamino)‐2H‐chromen‐2‐ones using N‐alkyl amines as the solvent and a carbon source under air conditions without any catalysts in one pot. This protocol highlights the special roles of 4‐(phenylamino)‐2H‐chromen‐2‐ones which were not only used as reactants but also as an internal oxidant selectively activated N‐α‐C(sp3)−H bond. This reaction features catalyst‐free, broad substrate scopes (N‐alkyl amines 27 examples and quinolinones 24 examples), operationally simple for the one‐step synthesis, and recovery and recycling of the solvent.
摘要 以N-烷基胺为溶剂和碳源,在空气条件下,不使用任何催化剂,通过底物诱导合成了4-(苯基氨基)-2H-色烯-2-酮类香豆素融合喹啉酮。该方案突出了 4-(苯基氨基)-2H-苯并吡喃-2-酮的特殊作用,它不仅可用作反应物,还可用作选择性活化 N-α-C(sp3)-H 键的内部氧化剂。该反应具有无需催化剂、底物范围广(N-烷基胺类 27 例和喹啉酮类 24 例)、一步合成操作简单以及溶剂回收和循环利用等特点。