Three‐Component Modular Synthesis of Maleimide‐Fused Carbazoles and Maleimide‐Fused Indoles Under Transition‐Metal‐Free Conditions

An NH 4 I‐promoted three‐component cascade cyclization reaction for the modular synthesis of maleimide‐fused benzocarbazoles and maleimide‐fused indoles has been developed. The present approach starts from readily available indoles/pyrroles, cyclohexanones, and maleimides, affording variety of maleimide‐fused benzocarbazoles and maleimide‐fused indoles in 40–83% yields under metal‐free conditions.