K2S2O8‐Promoted Haloamination of Non‐Functionalized Olefins for the Synthesis of 2‐Halomethyl Indolines and 2‐Halomethyl Dihydrobenzofuran

Abstract A metal‐free, economical and effective method for intramolecular haloamination/cyclization of non‐functionalized olefins was developed. In the presence of K 2 S 2 O 8 and sodium halide, 2‐allyl aniline can be converted into corresponding 2‐iodo, bromo and chloromethyl indolines skeleton compounds in good to excellent yields. Mechanism research suggested that the reaction didn't involve radical addition pathway. Introduction