Oxidative Alkenylation of Fused Bicyclic Heterocycles

The aim of this review is to highlight the advances made in the C-H/C-H functionalization of 5,5-fused-heterocyclic systems and 5,6-fused-heterocyclic systems such as indoles (C2, C3, C4, and C7 alkenylation), carbazoles, azaindoles, benzofurans, benzothiophenes, enzothiazoles, benzoxazoles, benzimidazoles, imidazopyridines, indolizines, indazoles (C3 and C7 alkenylation), and caffeine. The reports on oxidative alkenylation of 6,6-fused-heterocyclic systems including quinoxaline N-oxides, quinoxalines, quinolones, isoquinolones, quinolines, 1,4-benzoquinones, benzo[b][1,4]oxazines, benzo[b][1,4]thiazines, chromones, flavones, coumarins, 4H-pyrido[1,2-a]pyrimidin-4-ones, 1-(2H)-phthalazinones, phosphachromones, phosphacoumarins and sulfocoumarins will be also discussed.