Iron‐Catalyst‐Switched Selective Conjugate Addition of Grignard Reagents: α,β,γ,δ‐Unsaturated Amides as Versatile Templates for Asymmetric Three‐Component Coupling Processes

Diene for conjugate addition: Iron(II) chloride switches the reaction course of the three-component coupling of a Grignard reagent, an alkyl halide, and a dienamide, thus making the amide a simple yet versatile chiral template.