Recent Advances in Oxidative ipso‐Annulation of N‐Arylpropiolamides

Oxidative radical reactions have attracted much attention due to their extensive applications in organic synthesis. We herein summarize recent progress in the oxidative ipso‐annulation of N‐arylpropiolamides with various functional reagents, including ethers, alkanes, aldehydes, NaSO2CF3, tert‐butyl nitrite, disulfides, thiophenols, sulfonylhydrazides, AgSCF3, tetra‐n‐butyl ammonium bromide (TBAB), phosphorus and silanes, for the construction of diverse substituted spirocycles. Moreover, the mechanisms for the oxidative ipso‐annulation of N‐arylpropiolamides were also discussed.