Electrochemical Dearomatization of Indoles: Access to Diversified Fluorine-Containing Spirocyclic Indolines.

A robust and green electrochemical dearomatization of indoles was developed by merging a fluorine-containing group to an indole nucleus under oxidant-free conditions, delivering a diverse array of tri- and difluoromethylated 3,3-spiroindolines with good functional group tolerance.