An efficient visible-light-promoted organic-dye-catalyzed radical cascade cyclization was developed for the rapid synthesis of sulfonyl-substituted indolo[2,1-a]isoquinolines and benzimidazo[2,1-a]isoquinolin-6(5H)-ones.
A convenient visible-light-promoted difluoromethylation/cyclization reaction to access various difluoromethylated benzo[4,5]imidazo[2,1-a]isoquinolin-6(5H)-ones was developed using [Ph3PCF2H]+Br− as a difluoromethylated reagent.
An efficient metal- and additive-free nitro radical-triggered addition/cyclization for the synthesis of nitro-substituted indolo[2,1-α]isoquinoline and benzimidazo[2,1-a]isoquinolin-6(5H)-one derivatives has been developed.
A visible-light-induced cascade radical sulfamoylation/cyclization of 2-arylbenzoimidazoles to access sulfamoylated benzo[4,5]imidazo[2,1-a]isoquinolin-6(5H)-ones was achieved.
An efficient Ru(II)-photoredox-catalyzed radical cascade between N-substituted 2-arylbenzoimidazoles and diaryliodonium triflates furnishing a variety of arylated-benzimidazo[2,1-a]isoquinolin-6(5H)-ones is achieved.